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Patent 2506787 Summary

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(12) Patent: (11) CA 2506787
(54) English Title: INDUSTRIAL EQUIPMENT FOR ENVIRONMENTAL PROTECTION BY RANDOM STREAMER DISCHARGE PLASMAS AND ITS APPLICATIONS
(54) French Title: UNITE COMMERCIALE DE GENERATION DE DECHARGE PLASMA CONTINUE ALEATOIRE ET SON UTILISATION
Status: Granted
Bibliographic Data
(51) International Patent Classification (IPC):
  • H05H 1/42 (2006.01)
  • B01D 53/32 (2006.01)
  • B01D 53/34 (2006.01)
  • B01J 19/08 (2006.01)
  • H05H 1/24 (2006.01)
(72) Inventors :
  • YAN, KEPING (China)
  • LI, RUINIAN (China)
  • ZHANG, HONGDI (China)
(73) Owners :
  • GUANGDONG J-TECH ENVIRONMENTAL TECHNOLOGY CO., LTD. (China)
(71) Applicants :
  • GUANGDONG J-TECH SCIENCE DEVELOPMENT CO., LTD. (China)
(74) Agent: NORTON ROSE FULBRIGHT CANADA LLP/S.E.N.C.R.L., S.R.L.
(74) Associate agent:
(45) Issued: 2012-02-21
(86) PCT Filing Date: 2003-03-17
(87) Open to Public Inspection: 2004-06-10
Examination requested: 2005-05-19
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/CN2003/000189
(87) International Publication Number: WO2004/049769
(85) National Entry: 2005-05-19

(30) Application Priority Data:
Application No. Country/Territory Date
02153179.X China 2002-11-26

Abstracts

English Abstract





The invention discloses industrial equipment for environmental protection
by random streamer discharge plasmas, which is composed of a power source,
reactor(s) and a chemical physical technological processing system. Said
power source is comprised of a DC power source, a high frequency AC or
pulse power source and an LR matching network(s). Said reactor are vertical
or horizontal, dry or wet type; a wet type reactor has its thermal chemical
reaction region and plasma reaction in one body (integrative type reactor) or
in
different bodies (separate type reactor); the plasma reaction region of a
separate type reactor has its plasma gas reaction and plasma liquid reaction
in
one body (integrative type plasma reactor) or in different bodies (separate
type
plasma reactor); the reaction regions in the reactor are connected in parallel
or
in series and different sections of the reactor get power supply independently

or in a collective and distributive way. The industrial equipment for
generation
of random steamer plasma has random steamers with good temporal spatial
distribution, wide voltage ranges, high repetition frequency, large power
output,
broad application, and of low costs.


French Abstract

La présente invention a trait à une unité commerciale pour la génération de décharge plasma continue aléatoire, composée d'une alimentation, d'un système d'électrodes, d'un réacteur et d'un système de traitement chimique et physique. Ladite alimentation est constituée d'une alimentation en tension continue, d'une alimentation en courant alternatif haute fréquence ou d'une alimentation par impulsions et le réseau d'appariement LR pour le couplage d'alimentation en courant continu et en courant alternatif ou par impulsions. Ledit système d'électrodes est constitué d'une électrode de décharge et d'une électrode de mise à la terre qui sont disposées dans le réacteur, l'électrode de décharge est connectée à l'alimentation, l'alimentation du réacteur est contrôlée en mode réparti. L'invention présente les avantages suivants : la nature aléatoire, une large plage de tensions, une puissance élevée, la stabilité, une bonne distribution temporelle et spatiale, un coût économique et une utilisation variée.

Claims

Note: Claims are shown in the official language in which they were submitted.





Claims

1. Industrial equipment for environmental protection by random
streamer discharge plasmas including:
an electrode system comprised of discharge electrodes (1) and
grounding electrodes (2), chemical physical technological equipment comprised
of
absorbents, neutralizer, oxidants and catalysts, and a wet reactor (6) and
AC/DC
superimposed power supply (8); wherein
said AC/DC superimposed power supply (8) is comprised of a high
frequency rectification DC high voltage source (3), a high frequency AC or
pulse
source (4) and an LR matching web (5) used to couple the high frequency
rectification DC high voltage source (3) and the high frequency AC or pulse
source
(4);
said discharge electrodes (1) and grounding electrodes (2) are installed
in the wet reactor (6), said discharge electrodes (1) are connected to the
AC/DC
superimposed power supply (8) provided outside the wet reactor (6);
said chemical physical technological equipment is comprised of
atomizers (9), a chemical tank (10), a byproduct tank (11) and a storage
trough (12),
wherein the atomizers (9) are installed in the wet reactor (6) and connected
with the
chemical tank (10) and the byproduct tank (11); said byproduct tank (11) is
connected
with the wet reactor (6) and the storage trough (12), polluted gas enters the
wet
reactor (6) and is humidified by the atomizers (9) having thermal chemical
reactions
with chemicals from the byproduct tank (11) or chemical tank (10), and then
enters
the plasma reaction region formed by the electrode system to have a streamer
plasma
treatment.

2. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that the high

frequency rectification DC high voltage source (3) of said AC/DC superimposed
power supply (8) is triple-phased.

3. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that the high

frequency rectification DC high voltage source (3) of said AC/DC superimposed
power supply (8) is single-phased.

4. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that said LR



12




matching web (5) is comprised of 1~3 LR buffer circuits (13) and a coupling
capacitor (14).

5. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that said LR
matching web (5) is comprised of 1~2 LR buffer circuits (13) and an isolation
transformer (15).

6. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that an
inductor L in
said matching web (5) is constant, adjustable or combinations thereof, and
said
matching web (5) is provided with accessories including diodes, capacitors and

transformers or components to realize AC and DC coupling.

7. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that the
voltage of
said high frequency rectification DC power source (3) is less than 100kV and a
half of
peak-to-peak voltage of the AC source or peak voltage of the pulse source is
less than
100kV.

8. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that said
high
frequency AC or pulse source (4) has a frequency within the range of 1KHz to
100KHz.

9. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that in the
AC/DC
power supply (8), AC is superimposed on DC at DC onset streamer or around DC
onset streamer to glow threshold.

10. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in the waveform
of the
voltage exerted to the discharge electrodes (1) is a superimposition of a
positive DC
bias and high frequency AC power voltage having sinusoidal, triangle, squared
or
pulse waveforms.


11. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that said wet
reactor
(6) is a partitioned type wet reactor and has a thermal reaction region (27)
in series
with a plasma reaction region (28); gas reactions and liquid reactions in the
plasma



13




reaction region (28) are carried out in one body, and external gas is used for
oxidizing
the solutes in liquid phase in the plasma reaction region (28).

12. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that said wet
reactor
(6) is a partitioned type wet reactor and has a thermal reaction region (27)
in series
with a plasma reaction region (28); gas reactions and liquid reactions in the
plasma
reaction region (28) are carried out in separate bodies and external gas is
used for
oxidizing the solutes in liquid phase in the plasma reaction region (28).

13. The industrial equipment for environmental protection by random
streamer discharge plasmas according to claim 1 characterized in that the
electrode
configuration of the wet reactor (6) is wire-tube, wire-plate, point-plate or
wire-wire
type; the discharge electrodes are saw-tooth wire or knife-edge wire; the
surfaces of
the grounding electrodes are smooth or porous; said reactor (6) has one unit
or several
units in parallel and every unit is comprised of one stage or several stages
in series.

14. The industrial equipment for environmental protection by random
streamer discharge plasmas according to any one of claims 1-13 characterized
in that
the industrial equipment for environmental protection by random discharge
plasmas is
applied to the cleaning of air, flue gas, water and soil.



14

Description

Note: Descriptions are shown in the official language in which they were submitted.



CA 02506787 2005-10-27
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Industrial equipment for environmental protection by random streamer discharge
plasmas and its applications

Field of the invention
The present invention relates to the field of environmental protection
techniques
with plasmas, more especially, to industrial equipment for environmental
protection
by random type streamer discharge plasmas and its applications

Description of the prior art
It is well known that the electric gas discharge mode to initiate effective
chemical effects is positive streamer plasmas. So far, all the publicly
reported
streamer plasma generation techniques belong to synchronous ones. Their
characteristics are to energize reactors with narrow (or short)-pulsed high
voltages.
Under these conditions, when the pulsed voltages become higher than the onset
corona voltage, the pulsed streamers are formed and plasmas are generated in
the
reactors. The electrode configurations of said reactors have types of wire-
tube,
wire-plate, point-plate and wire-wire. When the pulsed high voltages transmit
from
one end to the other of a reactor, the streamers are successively generated at
different
positions. The time lag AT of the first streamers at two different positions
will be
generally satisfied the following inequality, namely, LT/L\L<5ns / m, where AL
is the distance between them.
In practice under the conditions of pulse energization, the effective length
of the
discharge wires generally ranges from one to six meters. So the streamers in
the
reactor almost are generated simultaneously, which is named as synchronous
streamer
plasmas. To the accompaniment of every pulse voltage the streamers initiate a
pulse
discharge current. The pulse voltage can be superimposed with a DC bias-
voltage and
the produced pulse discharge current , and the streamers have the same
characteristics.
The narrow pulse voltage source for generation of synchronous plasmas has
voltage rise time ranging from 10 to 100ns, pulse width ranging from 50 to
500ns and
repetition frequency ranging from 1 Hz to 2kHz. It is very difficult to
popularize
applications of said narrow pulse voltage source in industries because of its
high costs
and high technical difficulties. Moreover the high voltage, high current, high-
speed
switch in it needs further research and development.
The modes of electric discharge initiated by DC positive high voltage with the
elevation of the voltage may manifest onset streamer, glow, pre-breakdown
streamer
and spark discharge. The streamers generated with DC voltage appear within
narrow
voltage ranges and leave larger dead zone and unstable phenomena etc. in
industrial
plasma reactors.

Summary of the invention
The object of this invention is to provide industrial equipment for
environmental
protection by random streamer discharge plasmas and its applications. The
streamer
plasma generator used therein has low cost, wide voltage range of streamer,
high
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power and repetition rate and random generation of streamers, and can initiate
stable
and well space-distributed streamer discharges and realize various chemical
treatment
effects.
To achieve the above object, the technical scheme adopted in the present
invention is to provide industrial equipment for environmental protection by
random
streamer discharge plasmas including electrode system comprised of discharge
and
grounding electrodes, power source(s), chemical physical treatment system in
which
there are absorbent, neutralizer, oxidant and catalyst inside and reactor(s).
Said power
source is composed of a single-phased, triple-phased or high frequency
rectifier
DC high voltage source, high frequency AC or pulse source and an LR matching
web
for coupling the DC and AC or pulse sources. The power source is abbreviated
as
AC/DC source; said discharge and grounding electrodes are set inside the
reactor, said
discharge electrodes are connected with the outside power source; said
chemical
physical treatment system is composed of atomizers, chemical tanks, tanks and
storage troughs (pool) for the generated matter. The atomizers are arranged at
the inlet,
the roof and (or) the lateral sides within the main reaction regions and
connected with
pumps, chemical tanks, tanks and storage troughs (pool) for the generated
matter,
respectively, through pipelines. Said tanks for the generated matter are
connected with
reactors and storage troughs (pool), respectively. When solid matter is
treated a
granulator takes the place of the atomizers.
When coupled through a capacitor, said LR matching web can be composed of
1-3 LR buffer circuits and a coupling capacitor. When coupled directly, said
LR
matching web can be composed of 1-2 LR buffer circuits and an isolation
transformer. The inductance L in said LR matching web is fixed, adjustable or
their
combination. In said matching web, accessories for coupling of AC (or pulse)
and DC
can be installed. The accessories can be diodes, capacitors, transformer(s) or
solid
component(s) etc.
Said power source is a positive high voltage source with peak voltage less
than 200kV, in which the DC voltage is less than 100kV and the periodic
voltage has
its half of peak-to-peak voltage in AC or pulse peak in pulse power source
less than
100kV and its frequency between 1kHz and 100kHz. AC is superimposed on DC at
DC onset streamer or around DC onset streamer to glow threshold.

Said voltage exerted to the discharge electrodes is a DC voltage superimposed
with a high frequency AC voltage of sinusoid, triangle, square or pulse.
The reactors in the industrial equipment for environmental protection by
random
streamer plasmas can be vertical or horizontal; dry or wet type. The wet
reactor can be
differentiated as partitioned type and non-partitioned type. In a partitioned
type wet
reactor, its thermal chemical reaction region and plasma reaction region are
successively set in series in one body or in different bodies in parallel to
treat gas and
liquid separately. The polluted gas passes through the thermal chemical
reaction
region firstly in which the pollutants in gas are absorbed by liquid chemical
absorbent
and concentrated in the liquid and then the gas and liquid are transferred to
one
plasma reaction region in the same body, or the gas and liquid are separately
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transferred to different plasma reaction regions in different bodies to
experience
streamer plasma treatment, and further removing the gas pollutants from the
gas and
oxidizing or decomposing the solutes in the liquid phase are performed. In a
non-partitioned wet type reactor, thermal and plasma chemical reaction regions
are
successively set in one body.
The electrode configurations of said plasma regions can be the types of
wire-tube, wire-plate, point-plate or wire-wire. The discharge electrodes can
be
saw-tooth wire or knife-edge wire. The inner surfaces of grounding electrode
can be
porous or smooth. A reactor system can made up of one unit or several units in
parallel and every unit can be made up of one stage or several stages in
series. The
plasma reaction regions in the reactors are connected in parallel or in
series, and
different units of the reactors get power supply independently or jointly in a
collective
and distributive way.
The industrial equipment for environmental protection by random streamer
discharge plasmas provided by this invention can be applied to clean air, flue
gas,
water and soil.
In comparison to the equipment of synchronous plasmas, the industrial
equipment for environmental protection by random streamer discharge plasmas
provided by this invention has following advantageous effects:
1. A DC voltage superimposed with an AC or pulse voltage has a wide voltage
range
for generation of streamer discharge and can generate stable streamer
discharges with
good temporal and spatial distribution. Applying positive voltage of a DC
voltage
superimposed with an appropriate AC or pulse voltage, the electric discharge
from the
discharge electrodes to the grounding electrodes only manifests two modes, i.
e.
streamer and spark, with the increased voltage.
2. The waveforms of voltage generated from DC voltage superimposed with an
AC voltage such as sinusoid, triangle, square or wider pulse are wider pulses.
In
comparison to streamer plasmas generated from narrow pulse voltage, the
discharge
from AC / DC source has no essential differences in V-A characteristics. When
a
streamer appears, the voltage across the reactor decreases owing to the
streamer
generation. Besides the duration of the voltage pulse exerted on the
electrodes is long
compared to that of narrow pulse but the peak voltage from an AC/DC source is
relatively low. Therefore the streamers generated by AC / DC source will be
distributed within a relatively long time lag of tens to hundreds microsecond
( s) so
that they are random. However because of the relatively high streamer
repetition rate
between 1kHz and 100kHz, the streamer power appears high. The cost of
manufacturing an AC/DC source used in this invention is only one tenth of a
narrow
pulse high power supply. So random streamer technique initiates a new
development
space for its industrial applications
3. In a partitioned wet type reactor, the gas pollutants are absorbed by
liquid
absorbent firstly in its thermal reaction region and concentrated in the
liquid, and then
the gas and liquid are transferred to a plasma reaction region in one body, or
the gas
and liquid are separately transferred to different plasma reaction regions in
different
bodies to experience streamer plasma treatment and further removing the gas
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pollutants from the gas and oxidizing or decomposing the solutes in the liquid
phase
are performed. Because the pollutants are concentrated in the liquid, the
reaction
speed is increased, and they can be oxidized or decomposed at a relatively low
energy
cost. In comparison to non-partitioned wet reactors, the partitioned wet
reactors with
similar volumes for thermal and plasma reactions allows 30%-50% electricity
cost
reduction.
4. Oxidizing or decomposing the solutes in the liquid can be carried out in
either
treated flue gas or external gas.
5. The surfaces of the grounding electrodes can be smooth or porous so as to
increase the mass transfer rate and reaction speed initiated by the streamers

Brief description of the drawings
Figure 1 is schematic drawings of electrode configurations of(a)wire-tube ,
(b) wire-plate, (c) point-plate and (d) wire-wire;
Figure 2 is a view of capacitor coupling type LR matching web;
Figure 3 is a view of direct coupling type LR matching web;
Figure 4 (a) -4(d) are views showing different modes of electric discharges
within a point-plate electrode configuration with the increase of AC/DC
voltage,
in which figure 4(a) shows onset streamers, 4(b) streamers, 4(c) pre-breakdown
streamers, and (d) sparks;
Figure 5 shows the charts of voltage pulses generated by positive DC
superimposed with a sinusoidal voltage;
Figure 6 shows the charts of voltage pulses generated by positive DC
superimposed with a triangle wave voltage;
Figure 7 shows the charts of voltage pulses generated by positive DC
superimposed with a squared wave voltage;
Figure 8 shows the charts of voltage pulses generated by positive DC
superimposed with a wider pulse voltage;
Figure 9 is a schematic diagram of technological process for air cleaning of
highway tunnels;
Figure 10 is a schematic diagram of technological process for VOCs removal
from air;
Figure 11 is a schematic diagram of technological process for hazardous air
pollutants cleaning and air sterilization;
Figure 12 is a schematic diagram of technological process for semi-wet
method of streamer discharge flue gas desulfurization;
Figure 13 is a schematic diagram of technological process for swimming
pool water cleaning;
Figure 14 is a schematic diagram of technological process for treatment of
mud and soil.

Detailed description of the preferred embodiments
Example 1. Highway tunnel air cleaning
Air in highway tunnels is polluted by the end gas from motor vehicles. The
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pollutants have NOx at about IOppm , hydrocarbons to some amount,
sulfur-compounds and black smoke, which can not only reduce visibility, but
also
initiate a good many diseases. By use of this invention various hazardous
gases and
particles in tunnel air can be treated or collected in the example 1.
Table 1: Technical parameters for plasma cleaning of highway tunnel air
Flow rate of the air treated l 0000m3 / h
The reactor One stage horizontal wet reactor with a
wire-plate electrode configuration
Energy density of the streamer plasmas <0.3Wh / m3
Power of streamer discharge plasmas -3kW
DC high voltage source 20-30kV, 1kW
High frequency AC power source 30kV, 2kW, 50kHz, square wave(Fig.7)
LR matching web Capacitor coupling, three LR buffer
circuits and one coupling capacitor
(Fig.2)
Gas-to-liquid ratio in the reactor 2500
Volumetric rate of Cyclic water <4m3 / h
Treatment time 1 s
Gas flow speed 2m/s
NOx emission <_ 0.5ppm
Hydrocarbon and sulfur compound < lppm
emission
Dust emission < 5mg / m3
To prevent 03 slip, an additional ozone decomposer is installed at the end of
the
reactor. Wastewater is treated in some other way
In the tunnels, under the action of the active radicals such as OH, 0 and HO2
generated from the streamer plasmas NOx and SO2 are oxidized to HNO3 and
H2SO4,
which are dissolved in water while hydrocarbons are oxidized to aerosols
related. The
smoke and the aerosol particles formed are forced to charge and collected
under the
action of Coulomb force.
Figure 9 shows the schematic diagram of the technological process. The
polluted gas
passes through the air-flow-distributor to the inlet of a non-partitioned
horizontal
reactor 6 and enters its main reaction region. The electric field of a wire-
plate wet
type six-unit reactor has an effective length of 2.0m, width of 1.2m and
height of
1.2m. The distance between the wire and the plate is 200mm. The wires 1 are
cross-saw-tooth type and connected to an AC/DC source 8. In a collective and
distributive way of jointly energizing below the sparking voltage, the
streamers are
generated in a fairly wide range of voltage (Fig. 4c). The grounding
electrodes 2 are
smooth patterned plates. When the polluted gas enters the non-partitioned
horizontal
reactor 6, it is humidified firstly with lateral atomizers 9a and experiences
thermal
chemical reactions with the liquid pumped from a generated liquid tank 11 at
the
bottom of the non-partitioned horizontal reactor 6. Roof spraying is realized
with the
atomizer 9b at the top of the non-partitioned horizontal reactor 6. The
chemicals for
thermal chemical reactions are injected into the cyclic system through the
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tank 10. When the concentration of the liquid byproduct reaches its emission
limit, the
liquid is let out through liquid tank 11 and enters storage troughs (pool) 12.
The
treated gas is discharged through the non-partitioned horizontal reactor 6
into or out
of the tunnels.

Example 2. VOC cleaning in air
For controlling pollution of air due to low concentration volatile organic
compounds, traditional techniques are activated carbon absorption, catalytic
oxidation,
combustion, ozone oxidation, ultraviolet (UV) ray decomposition and advanced
oxidation techniques (UV+03+H202) and so on. The main problems of these
techniques are high costs and short lifetime of the systems. In the
implementation this
invention is used to efficiently oxidize VOCs to transform them to aerosols
and to be
removed in a wet plasma reactor.
Table 2: The parameters of the system for plasma cleaning VOC in air
Air flow rate 10000m3 / h
The reactor Two stage wire- tube vertical wet
reactor
Plasma energy density <2Wh / m3
Plasma power <20kW
DC high voltage source 20-30kV, 8kW
High frequency AC power source 30kV, 12kW, 50kHz, sinusoid (Fig.5)
LR matching web Direct coupling, 2 LR buffer circuits and
one isolation transformer (Fig. 3)
Gas to liquid ratio in the reactor 2500
Volumetric rate of Cyclic water < 4m3 / h
Treatment time 2 s
Gas flow speed 2m/s
VOC removal rate >_ 90% (take 25ppm C8H8 Yj as an
example)
A wet vertical plasma reactor with two stages in series is shown as Fig. 10.
Every
stage of the reactor has 46 units in parallel with wire-tube electrode
configuration
(seeing Fig. I a).
Every tube has its inner diameter of 200mm and length of 2000mm. Air polluted
by VOC enters the first stage 6a through its top entrance and contacts the
atomized
absorbent, which is from the chemical tank 10 and sprayed by an atomizer 9b,
and
flows to the plasma reaction region. In the plasma reaction region the
discharge
electrodes are saw-tooth wires 1 and the grounding electrodes 2 are smooth.
The wires
1 are connected through a wall-through insulator with an AC/DC power source
8a.
The gas is transferred to the bottoms of the second stage 6b of the reactor
through a
channel connecting the two stages from the bottoms of the first stage 6a.
Firstly the gas contacts the generated liquid from the generated liquid tank
11 b
through pipeline and sprayed by the atomizer 9b. Then the gas enters the
plasma
reaction region of the second stage 6b, whose configuration is same as the
former. But
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the discharge electrodes 1 in the second stage 6b are connected to the AC/DC
power
source 8b. The two stages get power supply independently in a collective and
distributive way. Before the gas is discharged from the second stage 6b, it is
eluted
once again with the generated liquid sprayed from the atomizer 9b at the top
of the
second stage 6b. The end liquid is discharged from the tank 11.
This example can also be used for other hazardous gas cleaning such as H2S,
NH3. phenol, HF, NF3, C2F6, CC14, SiF4. CFC-112, CFC-113 etc.

Example 3: Removal of hazardous air pollutants and air sterilization
At present there is an urgent need of equipment for removal of hazardous air
pollutants and air sterilization in the industries of food processing,
medicines and
livestock farming. However because of complex composition of the polluted gas
and
its low concentrations but large amount the activated carbon absorption method
used
nowadays has problems such as short lifetime of the activated carbon and high
operational costs. It is difficult to popularize it.
In the implementation this invention is used to very efficiently remove
hazardous
air pollutants and sterilize polluted air. Using plasma the gas pollutants can
be
oxidized and then dissolved in water. Under the action of plasma, bacteria
will be
oxidized and killed to realize sterilization. According to difference of sites
plasma
energy density for sterilization may ranged from 0.2 to 1.0 Wh / m3 . In a
food
processing workshop, 0.2 Wh / m3 is appropriate and 1.OWh / m3 is fit for the
inlet of
a chimney. Detailed parameters are shown in Table 3.
Table 3: Parameters for plasma cleaning of hazardous air pollutants and
bacterium
Air flow rate 5000m3 / h (chicken farm etc.)
The reactor Vertical single stage wet reactor with
wire-tube configuration
Plasma energy density <0.5Wh / m3
Plasma power _2.5kW
DC power source 20-30kV, 1.0kW
High frequency AC power source 30kV, 1.5kW, 30kHz, triangle wave (Fig.
6)
LR matching web Diode coupling, one LR buffer circuit
with a diode
Treatment time 1 s
Gas to liquid ratio in the reactor 2500
Gas flow speed 2m/s
Volumetric rate of Cyclic water <4m3 / h
A vertical one-stage reactor is comprised of twenty three wire-tube units in
parallel, with 200mm in diameter and 2m in length each. As shown in Figll, the
polluted gas enters the wire-tube wet reactor 6 through its bottom entrance
and
experiences thermal chemical reactions with the liquid chemicals firstly. The
chemicals from a chemical tank 10 are sprayed with an atomizer 9b. The
polluted gas
flows from above to below into a plasma reaction region, whose electric
discharge
system is made up of cross-saw-tooth discharge wires 1 and smooth tubular
grounding
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electrodes 2. The wires 1 are connected with an external AC/DC power source by
the
aid of a wall-through insulator. The polluted gas is washed by the eluting
liquid and
then discharged. The eluting liquid is from a tank 11 through a channel and a
valve
and sprayed into the plasma region and then let out from the tank 11.
Example 4: Cleaning of end gas from rubbish incinerators
A 150T/Day incinerator for urban rubbish may discharge 40000Nm3 / h waste
gas to be treated. At present incinerators in operation discharge large amount
of gas
with pollutants such as NOx, SO2, H2S, HCl, dioxin, heavy metals (Hg for
example)
etc.
By use of the invention this example may help realize comprehensive treatment
of cleaning for the end gas from the incinerators. The main parameters are
listed in
Table 4.
Table 4: The operational parameters for plasma cleaning of the end gas from
incinerators
Air flow rate 40000Nm3 / h
Composition of the gas C02: 8%; 02: 12%; H2O: 20%; N2: balance
Temperature of the gas 160-190 C
HC1 300-500ppm
NOx 100-200ppm
SO2 100-250ppm
Dioxin >5ng-TEG/ Nm3
Mercury 0.07-0. l mg/ Nm3
Dust 10-50mg/ Nm3
Hydrocarbons 1000ppm
Plasma discharge power <200Kw DC+ pulse (Fig 8)
Energy density of the Streamer plasma - 5 Wh / Nm3
Treatment time 2 s
Linear flow speed of gas 2m/s

Example 5: flue gas desulfurization and denitrification
The example discloses an overall technical scheme as follows: a wet method of
flue gas desulfurization by streamer discharges. By use of a partitioned wet
reaction
system, the solute of the end liquid byproduct is sulfates. The liquid is
vaporized with
the heat in the gas to be treated and after that turned into dry sulfate
powder. Heat in
the gas to be treated can also be used to elevate the temperature of the end
gas from
the wet reaction system. In this way, a stable technological process is
optimized and
industrialized. In the example the high voltage power source is a DC bias
superimposed with a periodical voltage i.e. AC/DC power source, with which
streamer plasma is generated. In order to improve efficiency of the
technological
process, an optimized electrode configuration is adopted so as to obtain an
excellent
both temporal and spatial distribution of streamer plasma within a large
volume of an
industrial reactor. In the example partitioned wet reactor system is adopted.
In the
system there is thermal reaction region, in which SO2 is absorbed from the
flue gas
with liquid absorbent and the generated tetravalent sulfur compounds are
concentrated
8


CA 02506787 2005-10-27
FP05019CA Amendment under PCT article 41

in the liquid, then this liquid and the treated gas are transferred to a
plasma reaction
region (in series with the former thermal reaction region) and treated with
streamer
discharges. In this way the sulfites in the liquid can be oxidized with a
lower energy
cost at a higher concentration of the solution. Meanwhile SO2 and NOx in the
gas are
further removed. Oxidation treatment of sulfite solutes can also be carried
out in a
plasma reaction region in a separate body. The gas in the separately set
plasma
reaction region can be external. The electricity cost of the partitioned wet
reactor can
be reduced by 30%-50% than the non-partitioned one. The advantages of this
streamer discharge flue gas desulfurization wet technological process lie in
simplicity,
continuation, stability and integration; dry powder of ammonium sulfate and
nitrate of
recovered byproduct and smaller space occupied, lower overall energy cost and
both
lower fix investment and operational costs.
The example is shown in Fig. 12. The hot flue gas 17 passes through a duster
16
and then enters a heat exchanger 18 to elevate the temperature of the end gas
20 from
the wet reaction system. After that the flue gas enters a dryer 19 to vaporize
water of
the sulfate solution pumped from the partitioned wet reactor 6 through
pipeline and
turn the solution into dry powder, which then falls into a storage trough 21,
being
drawn and packed. The temperature of flue gas at the entrance of the dryer is
selected
appropriately so as to allow a temperature higher than 70 C at the exit of the
dryer
and ensure a good dewatering effect. The treated gas gets its temperature
reduced and
humidity increased in the dryer 19 and then enters the thermal reaction region
27 of
the partitioned wet reactor 6 and furthers its humidification, temperature
reduction
and gets SO2 absorption by elution with water and solution from water tank 22
and
chemical tank 10. The liquid absorbent is pumped from the tank 11 a to the
sprayers
through pipeline and cyclically sprayed into the thermal reaction region to
absorb SO2.
When the concentration of the solution becomes appropriately high, the
generated
liquid is drawn at an appropriate rate and conveyed to the plasma reaction
region 28
from the tank llb through pipeline and a pump. Power source 8 is connected
with
discharge electrode 1. The grounding electrode is porous electrode. The
streamers
generated from the discharge electrodes oxidize the tetravalent sulfur
compounds in
the solution to sulfate, increasing the concentration of sulfate and meanwhile
further
removing SO2 and NOx from the gas. The liquid from the plasma reaction region
28
is transferred the tank 11 c under a demister 23. By keeping balance of the
stored
liquid, the liquid is continuously transferred to the dryer 19 for dewatering.
In the
liquid transfer pipeline a pH detector 24 is installed. According to the data
of the pH
detector 24 adjustment of neutralization for the generated liquid is carried
out. The
treated gas is transferred to the heat exchanger 18 through the demister 23
and the exit
of the partitioned wet reactor 6 and discharged as the end gas through a
chimney 25
after its temperature being elevated in the heat exchanger 18. Before the
inlet of
chimney 25 an ammonia detector 26 is installed to control the quantity of
ammonia
used and to prevent ammonia slip.
In this example the technique used to treat flue gas is the invention of the
semi-wet method of desulfurization and denitrification. The temperature of the
partitioned wet reactor system is T;:t60 C. The flue gas has its initial
concentrations of
9


CA 02506787 2005-10-27
FP05019CA Amendment under PCT article 41

SO2 z~1000ppm and NOx Q00ppm. and volumetric flow rate F,&100000m3 / h. The
rated power of the electric source is P=200kW, in which DC is 15kV and 100kW
and
AC is 30-40kV, 100kW with a frequency f=20kHz. The energy density is E=2 Wh
/ m3. A capacitor coupling type LR matching web is used, which is composed of
three LR buffer circuits and a coupling capacitor. The flue gas has its linear
flow
speed 2m/s and residence time 2s. The results are desulfurization rate r1so2
>,95 %,
denitrification rate r1NOX % 50 % and ammonia injection rate is controlled
with
ammonia slip less than 5ppm. In addition, the removal rates of chlorides,
mercury,
dioxin and hydrocarbons from the flue gas are all greater than 95%. If three
stages
typed reaction system is used, the thermal chemical reaction stage is the
first and the
other two stages will be plasma regions in parallel, one for treating gas,
another for
treating the generated liquid. Other basic solutions can also be used as the
absorbent.
Example 6: Cleaning of waste and drinking-water
Waste water generally contains both organic and inorganic pollutants. Using
oxidation techniques may turn the pollutants into harmless matter. At present
the most
popularized oxidizers are ozone, hydrogen peroxide, chlorine dioxide and
potassium
permanganate etc. To realize advanced oxidation treatment, (AOT) oxidizers may
be
combined with other effects of catalysts such as Ti02 or ultraviolet rays.
In this example, this invention is used for advanced oxidation treatment of
various waste water, drinking water etc. The installation is simple and the
operational
cost is low.

Table 5: Parameters for plasma cleaning of waste water and drinking water
Rate of treated water 50 T/h
Streamer plasma power 2.5kW
DC voltage source 20kV, 1.0kW
High frequency AC source 30kV, 1.5kW, 30kHz, squared wave(Fig.
7)
The Reactor Vertical wire-tube type
As shown in Fig. 13, the reactor 6 is composed of three wire-tube units in
parallel
with the length 1000mm and diameter 120mm thereof. The water to be treated is
sprayed by an atomizers 9b at the top of the reactor 6 and discharged at its
bottom. Fig.
13 shows a technological process for plasma cleaning of swimming pool water. A
plasma reactor can not only remove hazardous air pollutants but also kill
bacterium
(take colon bacillus for example efficiency >95 %). An AC/DC power source with
capacitor coupling LR matching web 5a is used. A capacitor type LR matching
web
5a constructed with three LR buffer circuits 13a with constant inductors and a
coupling capacitor 14 are used to couple a single-phased DC source 4 with a
high
frequency AC source 3. Water pool is numbered 12.
Instead of cleaning of wastewater and drinking water by random streamer
discharge plasmas ozone can be generated firstly and then treat wastewater or
drinking water with the generated ozone



CA 02506787 2005-10-27
FP05019CA Amendment under PCT article 41

In the process of making ozone with air, it is necessary to drop temperature
and
moisture of the air. The main parameters are shown in Table 6
Table 6: Parameters for generation of ozone by streamer plasmas
Volumetric flow rate of dry air 1000m3 / h
Concentration of ozone 1000ppm
Energy yield of ozone 71g / kWh
Streamer plasma power 30kW
DC power source 20kV, 15kW
High frequency AC power source 20-30kV, 15kW, 30kHz, sinusoidal
wave (Fig.5)
The reactor wire-tube, vertical, dry
The vertical reactor with fifteen wire-tube units in parallel is used. Each
has a
diameter of 100mm and height of 2000mm. The discharge electrodes are knife-
edge
type. The energy yield of ozone may reach 71g / kWh.
This example can also be applied for oxidation treatment of liquid, for
example
oxidation of solutes of sulfite to sulfate.

Example 7: Mud and soil cleaning
There are various kinds of mud, which may contain both organic and inorganic
pollutants, microbes, germs and virus etc. In the example, this invention is
used for
oxidization treatment of not only various organic and inorganic pollutants but
also
microbes, germs and virus. The main parameters are specified in Table 7.
Table 7: Parameters for plasma cleaning of mud and soil
Treatment quantity of mud and soil 40T/day (with 20% water content)
Streamer plasma power 5kW
DC power source 20kV, 2.5kW
High frequency AC power source 20-30kV, 2.5kW, 30kHz, pulse (Fig. 8)
The reactor wire-tube type, vertical
As shown in Fig.14, the reactor 6 is composed of ten vertical wire-tube units
with a height of 2000mm and diameter of 120mm thereof. The mud to be treated
spouts from a granulator 7 and passes the top of the reactor 6. The granules
of the
mud or soil appear fluidized in the reactor 6. Plasma can not only be
generated in gas
but also on the surfaces of the granules. One cycle of treatment allows a
cleaning
efficiency 95% for colon bacillus and other germs. An AC/DC power source with
direct coupling LR matching webs 5b is used. That is two LR buffer circuits
13b are
used, in which adjustable inductors and one isolation transformer 15 are used
to build
a direct coupling LR matching web 5b, which couples a three-phased
rectification
power source 4 with a high frequency AC power source 3.

11

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date 2012-02-21
(86) PCT Filing Date 2003-03-17
(87) PCT Publication Date 2004-06-10
(85) National Entry 2005-05-19
Examination Requested 2005-05-19
(45) Issued 2012-02-21

Abandonment History

There is no abandonment history.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $800.00 2005-05-19
Application Fee $400.00 2005-05-19
Maintenance Fee - Application - New Act 2 2005-03-17 $100.00 2005-05-19
Registration of a document - section 124 $100.00 2005-10-27
Maintenance Fee - Application - New Act 3 2006-03-17 $100.00 2006-03-16
Maintenance Fee - Application - New Act 4 2007-03-19 $100.00 2007-01-29
Maintenance Fee - Application - New Act 5 2008-03-17 $200.00 2008-03-14
Maintenance Fee - Application - New Act 6 2009-03-17 $200.00 2009-03-03
Maintenance Fee - Application - New Act 7 2010-03-17 $200.00 2010-03-09
Maintenance Fee - Application - New Act 8 2011-03-17 $200.00 2011-01-26
Registration of a document - section 124 $100.00 2011-07-13
Final Fee $300.00 2011-12-08
Maintenance Fee - Patent - New Act 9 2012-03-19 $200.00 2012-03-09
Maintenance Fee - Patent - New Act 10 2013-03-18 $250.00 2013-03-13
Maintenance Fee - Patent - New Act 11 2014-03-17 $250.00 2014-02-25
Maintenance Fee - Patent - New Act 12 2015-03-17 $250.00 2015-01-15
Maintenance Fee - Patent - New Act 13 2016-03-17 $250.00 2016-03-16
Maintenance Fee - Patent - New Act 14 2017-03-17 $250.00 2017-03-16
Maintenance Fee - Patent - New Act 15 2018-03-19 $450.00 2018-03-15
Maintenance Fee - Patent - New Act 16 2019-03-18 $450.00 2019-02-26
Maintenance Fee - Patent - New Act 17 2020-03-17 $450.00 2020-03-13
Registration of a document - section 124 2020-04-22 $100.00 2020-04-22
Maintenance Fee - Patent - New Act 18 2021-03-17 $459.00 2021-01-11
Maintenance Fee - Patent - New Act 19 2022-03-17 $458.08 2022-02-16
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
GUANGDONG J-TECH ENVIRONMENTAL TECHNOLOGY CO., LTD.
Past Owners on Record
GUANGDONG J-TECH ENVIRONMENT SCIENCE CO. LTD.
GUANGDONG J-TECH SCIENCE DEVELOPMENT CO., LTD.
LI, RUINIAN
YAN, KEPING
ZHANG, HONGDI
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
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Description 
Date
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Abstract 2005-05-19 1 31
Claims 2005-05-19 2 93
Drawings 2005-05-19 8 120
Description 2005-05-19 12 780
Representative Drawing 2005-05-19 1 10
Cover Page 2005-08-22 1 49
Abstract 2005-10-27 1 30
Claims 2005-10-27 2 100
Description 2005-10-27 11 745
Drawings 2005-10-27 8 128
Claims 2010-01-26 3 132
Abstract 2011-12-20 1 30
Representative Drawing 2012-01-23 1 9
Cover Page 2012-01-23 2 56
PCT 2005-05-19 10 429
Assignment 2005-05-19 4 142
Correspondence 2005-08-16 1 28
Assignment 2005-10-27 3 128
Prosecution-Amendment 2005-10-27 1 50
Prosecution-Amendment 2005-10-27 19 976
Assignment 2011-07-13 4 122
Prosecution-Amendment 2009-07-30 3 120
Prosecution-Amendment 2010-01-26 9 432
Correspondence 2011-12-08 2 63