Note: Descriptions are shown in the official language in which they were submitted.
WO9Y14640 ~ 6~ P~ rl67
i
VAPORIZING AND CON~ L~ATION DRYING APPARATUS AND
METHOD
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates in general to vaporizing
and concentration drying apparatus and method and, more
particularly, to an i~ UV. -nt in such apparatus and
method for recovering and reusing evaporation heat by means
of liquidizing at a high temperature, that is, latent heat
occurred in the process of vaporization reducing or
increasing the pressure so as to save heating energy, and
for 02idizing or carbonizing the vaporized impurities, such
as odor, B . O . D . and C . O . D . laden in the vapor, at a high
temperature so as to remove the vaporized impurities and to
provide good quality of condensed water.
Description of the Prior Art
In conventional vaporizing apparatus, cooling water
for condensing of vapor should be added to the apparatus
along with the required heat for vaporization, that is,
boiling heat (100 Rcal) and evaporation heat (latent heat
of vaporization, 539 Kcal/~ ). In the case of distilled
water which is prepared by vaporization and c~nr~Pncation of
wet material, such as wet sludge or waste water, using the
above vaporizing apparatus, a part of environmental
polluting impurities, such as odor, B.O.D. and C.O.D.,
laden in the wet material is vaporized along with the
vapor, thus to be laden in the vapor. The impurities laden
in the vapor in turn are liquidized along with the vapor
when condensing the vapor. The distilled water thus can
not achieve allowable standard quality of water, so that
the distilled water needs to be retreated in order to
achieve the allowable standard quality.
The typical vaporizing apparatus as well as the
WO 95114640 r~ i67O
~17716~
typical vaporizing method can not recover and reuse the
latent heat of vaporization (539 Kcal/~ ) of the vapor, but
discard the latent heat through a condenser system used in
cooling and condensing the vapor laden with impurities.
5 Furthermore, such discarding of the latent heat should be
a~ _-nied by considerable cost.
Additionally, the typical vaporizing apparatus or the
typical vaporizing method can not remove the impurities,
such as odor , B . O . D . and C . O . D ., which impurities are
10 vaporized and liquidized along with the vapor and reduce
the quality of the distilled water. In this regard, the
distilled water should be treated through an additional
water purifying procedure so as to improve the quality of
the distilled water. The additional water purifying
15 procedure for improving the quality of the distilled water
is very complicated and increases the cost for preparation
of the distilled water.
When water is vaporized using a pressure reducing
vaporizing method so as to become steam, the evaporation
20 heat can be saved by the amount of reduced pressure
according to degree of vacuum. However, this pressure
reducing vaporizing method still has a problem that the
condensed water is laden with odor, B.O.D. and C.O.D., so
that the condensed water needs to be treated through
25 additional procedure for deodorization and for water
purif ication .
In the typical heating vaporizing apparatus, the total
heat for vaporizing 1 ~ of water of 0 C at atmospheric
pressure is 639 Kcal. That is, the boiling heat for
30 boiling the water at 100 'C is lO0 Kcal and the evaporation
heat for vaporizing the boiled water is 539 Kcal, so that
the total heat for vaporizing l ~ of water is 639 Kcal,
that is, lO0 Kcal + 539 Kcal = 639 Kcal. When vaporizing
l ~ o~ water of 0 'C using pressure reducing vaporizer, the
35 water is boiled at 35 'C under the condition that the
degree of vacuum is about lO Torr (750 mmHg), so that the
Wo 95/14640 21 7 71 6 ~ PCT~R94/00167
total heat for vaporizing l Q of water is 605 Kcal, that
is, 35 Kcal + 570 Kcal = 605 Kcal (latent heat may be about
570 Kcal when vaporizing pressure is 0.l kg/cm2 A).
However, the typical vaporizing apparatus should use
5 a condenser for condensing and liquidizing the vapor, so
that large amount of cooling water for condensing should be
added to the apparatus. Furthermore, the latent heat (539
Kcal) of the vapor can not be recovered and reused, but
discarded .
Briefly described, when vaporizing l Q of water of 0
C at atmospheric pressure using either the typical
pressure reducing vaporizing method or the typical heating
vaporizing method, the total heat to be applied to the
water is 574 Kcal or 639 Kcal. Furthermore, additional
15 energy for supplying the cooling water of the condenser
should be applied to the apparatus. In the process of
condensing the vapor, the latent heat (539 Kcal) of
vaporization can not be recovered but discarded. In
addition, the typical vaporizing apparatus itself can not
20 remove the environmental polluting impurities, such as
odor, B.O.D. and C.O.D., from the con~lpn~ed water, so that
the condensed water needs to be treated through additional
procedure for deodorization and for water purification.
SU~ARY OF T~E INVENTION
It is, therefore, an object of the present invention
to provide vaporizing and concentration drying apparatus
and method in which the above problems can be overcome and
30 which provides good s~uality of condensed water and saves
evaporation energy so as to save the heating energy by
reusing latent heat occurred in the process of vaporization
reducing or increasing the pressure, and is wide used in
making contaminated waste water become distilled water and
35 in purification of the waste water and in concentration
drying of varieties of environmental polluting sludge.
WO 95114640 P~ r 16~0
161
The apparatus and method of the invention recover and
reuse heating energy, which energy was applied to the vapor
so as to heat the vapor to a high temperature for oxidizing
or carbonizing and to remove the environmental polluting
impurities, such as odor, B . O . D . and C . O . D . laden in the
vapor, so that the apparatus and method remarkably save the
cost for the heating energy.
The present invention reduces the cost for production
of the vaporizing apparatus and for operation of the
apparatus in comparison with the conventional apparatus,
thus to provide economic advantage for the user. The
apparatus also saves the energy by 2 - l0 times in
comparison with the conventional apparatus. In the
apparatus of this invention, the odor and the impurities
laden in the vapor can be oxidized or carbonized and be
completely removed from the vapor when heating the vapor at
a high temperature, so that the apparatus provides good
quality of distilled water without using additional water
purifying means.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other
advantages of the present invention will be more clearly
understood from the following detailed description taken in
conjunction with the accompanying drawings, in which:
Fig. l is a partially sectioned view of vaporizing and
concentration drying apparatus according to a preferred
embodiment of the present invention;
Fig. 2 is a perspective view of a heat recovering unit
of the apparatus of Fig. l, showing the internal structure
of the unit;
Fig. 3 is a partially sectioned front view of the heat
recovering unit of Fig. 2, showing the heat e~changing
state between reversely flowing high temperature vapor and
normally flowing lower temperature vapor in the unit;
Wo 95/14640 2 1 7 7 1 fi I P~ r ~ 1 67
Fig. 4 is a partial perspective view of agitating
blades and panel type steam chambers, which blades and
chambers are installed in a vaporizer of the apparatus of
Fig. 1; and
Fig. 5 is a partially enlarged view showing the panel
type steam chambers of Fig. 4.
DESCRIPTION OF THE ~K~;K~ EMBODIMENTS
With reference to Fig. 1, there is shown, in a
partially sectioned view, a construction of vaporizing and
concentration drying apparatus according to a preferred
embodiment of the invention. In this drawing, the
reference numeral 1 denotes a container for containing the
wet material to be treated by vaporizing. The container 1,
which is equipped with a coiled tube R therein, is provided
on its top with a first inlet port 15a for charging the wet
material, for example, the water or the wet sludge, to be
treated. The container 1 is cased by a double structure
wall, which double structure wall is for recovering waste
heat from c~n~l~n~d water which will circulate in the
container 1 The container 1 is connected to a vaporizer
10 for vaporizing and concentration drying the wet
material, which vaporizer 10 is an agitating type vaporizer
and will contain therein wet material, for example, waste
water or wet sludge. The vaporizer 10 is provided on its
top with a second inlet port 15b for selectively charging
the wet material to be vaporized. The vaporizer 10 is
rounded on its bottom and has a recess 11 in a lower
section of the side wall beside the rounded bottom. A
screw lls for discharging sludge to the outside of the
vaporizer 10 is placed in the recess 11. In order to
agitate the wet material in the vaporizer 10, a plurality
of panel type semicircular steam chambers 13 are vertically
placed in the vaporizer 10, so that the chambers 13 are
horizontally arranged and regularly spaced apart from each
Wo 95/14640 l~ i 1670
~1771~
other as shown in Figs. 4 and S. A plurality of agitating
blades 12 are placed between the chambers 13. l~ach of
blades 12 can be rotated in opposed directions in the space
def ined between the chambers 13, thus to agitate the wet
material to be vaporized. As shown in Fig. 5, the inside
end sections of the opposed side walls of each of the panel
type steam chambers 13 smoothly converge into a single
ridge, thus to let smooth rotation of the agitating blades
12 placed between the panel type steam chambers 13. The
agitating blades 12 are fitted over a blade shaft S, which
shaft S lengthwise extends in the center of the vaporizer
10. The panel type steam chambers 13 communicate with a
steam chamber 14 def ined in the double structure wall of
the vaporizer 10. The top of the vaporizer 10 is connected
to an overf low preventing chamber 17 through a connection
pipe 16, which overflow preventing chamber 17 in turn is
connected to the interior of the vaporizer 10 through a U-
shaped trap 18. The trap 18 extends from the bottom of the
chamber 17 to the interior of the vaporizer 10.
A first conduit R1 extends from the top of the overflow
preventing chamber 17 to a vapor compressing turbine 20.
The conduit R1 is provided with a control valve 21 for
supplying of preheated air to the vapor f lowing in the
conduit R1. The rear end of the vapor compressing turbine
20 in turn is connected to a vapor compressing pump 30
through a second conduit R2. A third conduit R3 extends
from the vapor compressing pump 30 to a heat recovering
unit 60. As shown in Figs. 1 to 3, the heat recovering
unit 60, which is adapted for recovering the heat from a
high temperature vapor and reusing the recovered heat for
preheating low temperature vapor, is equipped with a bundle
of ninth conduits or steam conduits Rg, which conduits Rg
horizontally extend in the unit 60 and regularly spaced
out. The opposed ends of the heat recovering unit 60 in
turn are connected to an auxiliary boiler 40, having its
own heating means, and to the vaporizer 10 through the
Wo gs/l4640 F~l/~S 1~ :167
~17~
fourth and sixth conduits R~ and R6 respectively. In the
auxiliary boiler 40, the fourth conduit Rj is connected to
a coiled vapor heating tube 42 in front of the nozzle of a
burner 41. The burner 41 is mounted to the front wall of
the boiler 40 and generates flame which will be directed to
the interior of the boiler 40. The coiled tube 42, which
surrounds a vapor heating chamber 43 in the boiler 40, in
turn is connected to the heat recovering unit 60 through a
fifth conduit R5. Thus, the latent heat of vapor can be
recovered by the unit 60 and reused for preheating the low
temperature vapor f lowing in the steam conduits Rg .
A seventh conduit R~, having a pressure regulator 51 as
well as a drain valve 52, extends from the steam chamber 14
of the vaporizer 10 at the rounded bottom of the vaporizer
10 and connected to the container 1. In the container 1,
the condensed water loses the heat while passing through
the coiled tube R. The condensed water is, thereaf ter,
introduced into a condensed water tank 50, thus to be
collected in the tank 50.
In operation of the above apparatus, the wet material
to be vaporized, for example, waste water is charged in the
container 1 through the f irst inlet port 15a of the
container 1, which container 1 can recover the waste heat
from the condensed water. The waste water in turn is
introduced into the vaporizer 10 through an eighth conduit
R8, thus to be vaporized or concentration dried in the
vaporizer 10 and to become vapor . The vapor in turn f lows
to the overf low preventing chamber 17 through the
connection pipe 16 and, thereaf ter, is introduced into the
turbine 20 through the f irst conduit R1 . Prior to
introduction of the vapor to the turbine 20, the control
valve 21 of the first conduit Rl adds an appropriate amount
of preheated air to the vapor. Here, the preheated air
added to the vapor in accordance with characteristics of
vaporized impurities laden in the vapor is for promotion of
oxidation of the impurities. However, it should be
wo 9~5/146~0 ~ ~ 7 7 ~ & ~ PCT/KR94/0016 0
understood that the vapor laden with the impurities may be
carbonized at a high temperature without addition of
preheated air in accordance with characteristics of the
vaporization subject. At this time, the vaporizer lO is
vacuumized due to action of the vapor compressing turbine
20 and due to action of the vapor compressing pump 30, so
that the vaporizer lO has an inner temperature of about 60
C as well as a degree of vacuum ranged from about 300 mmHg
to about 400 mmHg. The vapor is, thereafter, more
compressed by the vapor compressing pump 30, so that the
vapor pressure is increased.
The high pressure vapor in turn is introduced into the
steam conduits R9 of the heat recovering unit 60 through the
third conduit R3 and discharged from the unit 60 to the
l~ auxiliary boiler 40 through the fourth conduit R~. In the
auxiliary boiler 40, the vapor is heated by vapor heating
means while passing through the vapor heating tube 42 and
through the vapor heating chamber 43, thus to become high
temperature vapor, the temperature of which vapor is ranged
from about 600 'C to 800 C. As a result of heating of the
vapor in the boiler 40, the impurities laden in the vapor,
such as odor , B . O . D . and C . O . D ., are removed f rom the vapor
by oxidation and carbonization. The vapor, after being
heated by the boiler 40, returns to the heat recovering
unit 60 through the fifth conduit R5. In the unit 60, the
vapor of 600 'C to 800 'C exchanges the heat with new
vapor, which new vapor is newly introduced into the
conduits R9 of the unit 60 and has a low temperature ranged
from 60 'C to lO0 'C. In the heat recovering unit 60, the
vapor which was heated by the vapor heating means of the
boiler 40 is guided by guiding partitions of the unit 60 to
about the steam conduit R9, through which conduit R9 the low
temperature vapor passes. That is, the high temperature
vapor in the unit 60 flows from the rear section to the
front section of the unit 60 in a zigzag passage and
exchanges the heat with the low temperature vapor passing
~ WO 95/14640 . ~ r 167
217~
through the conduit R9 from the front section to the rear
section .
As shown in Fig. 2, the guide partitions may be
vertically placed in the heat recovering unit 60, so that
5 the partitions are spaced out at regular intervals. The
partitions will lengthen the heat exchanging time of the
vapor in the unit 60, thus to improve the heat exchanging
effect of the unit 60. However in the first stage of the
operation of the apparatus, the water in the boiler 40 is
10 heated by the heating means of the boiler 40, thus to
become high temperature steam. The carbonized or oxidized
high temperature steam of the boiler 40 is supplied to the
panel type steam chambers 13 and to the steam chamber 14 of
the vaporizer 10 through a tenth conduit R1o, the third
15 conduit R3 with the regulator 51, the heat recovering unit
60, the fourth conduit R4, the boiler 40, the fifth conduit
R5, the unit 60 and the sixth conduit R6 in turn. In the
vaporizer 10, the high temperature steam supplied from the
boiler 40 exchanges the heat with the waste water, thus to
20 make the waste water become low temperature vapor of about
60 'C - 100 'C. The vapor of about 60 'C - 100 'C is
introduced into the heat recovering unit 60 through the
above-described procedure and absorbs the heat from the
high temperature vapor supplied from the boiler 40 through
25 the fifth conduit R5. As a result of the heat exchanging,
the temperature of the lower temperature vapor is increased
from 60 'C - 100 'C to 450 C - 600 'C. The preheated
vapor of 450 'C - 600 'C in turn is discharged from the
unit 60 to the boiler 40 through the fourth conduit R4.
30 Meanwhile, the vapor whose temperature was reduced to 150
'C - 200 'C as a result of heat exchanging in the heat
recovering unit 60 is discharged to the vaporizer 10
through the sixth conduit R6.
The preheated vapor of 450 'C - 600 'C discharged from
35 the unit 60 to the boiler 40 through the fourth conduit R~
is heated in the boiler 40 by the vapor heating means of
WO 9~114640 PCTIKR94/0016 ,0
æ~ 6~
~, .
the boiler 40 and introduced into the coiled vapor heating
tube 42 and into the vapor heating chamber 43, thus to be
oxidized or carbonized and to .become vapor of high
temperature of 600 'C - 800 'C. The oxidized or carbonized
vapor of the boiler 40 is introduced into the unit 60
through the fifth conduit R5 and flows from the rear section
to the front section of the unit 60 in the zigzag passage
and exchanges the heat with the vapor of low temperature of
60 C - lO0 'C passing through the conduit R9 from the front
section to the rear section. Here, the heating energy,
which energy was applied to the vapor in the boiler 40 by
the vapor heating means and heats the vapor and increases
the temperature of the vapor to 600 'C - 800 'C, is
recovered in the heat recovering unit 60. That is, the
heating energy laden in the high temperature vapor of 600
'C - 800 'C is recovered and reused for preheating the
vapor flowing in the steam conduits Rg of the unit 60 as
represented in Fig. 3. As a result of the preheating, the
temperature of the vapor introduced from the vaporizer 10
is increased from 60 'C - 80 'C to 450 'C - 600 'C. As the
temperature of the vapor, which vapor will be introduced
into the boiler 40, is increased from 60 'C - 80 'C to 450
'C - 600 'C as a result of heat e~:changing in the unit 60,
the heating energy of the heating means of the boiler 40
can be remarkably saved.
The vapor, which vapor is discharged from the unit 60
through the sixth conduit R6 and has the temperature of 150
'C - 200 'C and whose lmpurities was oxidized or
carbonized, is supplied to the panel type steam chambers 13
and to the steam chamber 14 of the vaporizer 10. In the
vaporizer 10, the vapor supplied from the unit 60 exchanges
the heat with the waste water, thus to lose its evaporation
heat and to be li~auidized and to become relatively high
temperature condensed water, so that the water or the wet
material of the vaporizer lO recovers 539 Xcal (when
vaporizing pressure is l. 013 kg/cm2-A) of latent heat from
~\ Wo95/14640 ~ 167
21771Çl
-
11
the vapor by means of liquidizing at a high temperature.
This condensed water of about 80 'C - 120 'C in turn is
introduced into the coiled tube R of the container 1
through the seventh conduit R7 having both the pressure
5 regulator 51 and the drain valve 52. The coiled tube R
secondarily recovers the waste heat from the condensed
water. The condensed water is collected to the condensed
water tank 50. When filtering the condensed water in the
tank 50, the oxidized or carbonized impurities are removed
10 from the condensed water, thus to let the condensed water
become good distilled water.
In the above embodiment, the waste water is vaporized
through pressure reducing vaporization. However, it should
be understood that the waste water may be vaporized at a
15 high pressure not less than the atmospheric pressure. That
is, the apparatus of the present invention may vaporize the
waste water under the pressurized condition.
The operational effect of the invention will be
described hereinbelow.
The wet material to be vaporized or the waste water in
the container 1 absorbs the waste heat from the high
temperature condensed water f lowing in the coiled tube R .
The preheated waste water is, thereafter, naturally
introduced into the vaporizer 10 through the eighth conduit
25 R8 due to the pressure reducing action of the vapor
compressing turbine 20 as well as due to the pressure
reducing action of the vapor compressing pump 30. In the
vaporizer 10, the agitating blades 12 even mi~es the waste
water, so that the waste water will be vaporized as will be
30 described hereinbelow. After mixing the preheated waste
water, the sludge of the waste water is collected to the
recess 11 of the vaporizer 10. The sludge in the recess 11
in turn is discharged to the outside of the vaporizer 10 by
the sludge discharging screw 11s. Meanwhile, the remaining
35 waste water free from the sludge absorbs the evaporation
heat from the high temperature vapor o~ 1~0 'C - 200 'C
Wo 95/14640 P~ll~ 1.l 1670
2177161
12
flowing in the panel type steam chambers 13 and flowing in
the steam chamber 14 of the vaporizer 10, thus to be
vaporized and become low temperature vapor. The waste
water in the vapor state in turn is introduced from the
vaporizer 10 into the overf low preventing chamber 17
through the connection pipe 16, which overflow preventing
chamber 17 has the U-shaped trap 18 extending from the
bottom of the chamber 17 to the interior of the vaporizer
10 and adapted for preventing possible overflow of the
waste water out of the vaporizer 10 during vaporization in
the vaporizer 10. The vapor of the waste water is,
thereafter, introduced into the vapor compressing turbine
20 through the first conduit R1 which extends from the top
of the chamber 17 to the vapor compressing turbine 20.
Before introduction of the vapor to the turbine 20, the
vapor may be selectively added with the predetermined
amount of preheated air under the control of the control
valve 21, which valve 21 is placed in front of the vapor
inlet port of the turbine 20.
The vapor of the vapor compressing turbine 20 in turn
is introduced into the vapor compressing pump 30 wherein
the vapor is compressed so as to increase its pressure. At
this time, the waste water in the vaporizer 10 is vaporized
at a temperature of about 60 'C due to the pressure
reducing condition in the vaporizer 10. In addition, the
vaporizer 10 achieves the degree of vacuum ranged from
about 300 mmHg to about 400 mmHg due to the pressure
reducing action of the vapor compressing turbine 20 as well
as due to the pressure reducing action of the vapor
compressing pump 30. As will be represented by the
following basic equation (E-1) concerning to the ideal gas,
the pressure of the vapor may be increased by both the
turbine 20 and the pump 30, so that the vapor is liquidized
at a high pressure and at a high temperature. Of course,
the apparatus of the invention may use a vacuum booster, a
vacuum molecular pump or a vapor compressing member other
J Wo 95114640 PCT/KR94/00167
2177~1
13
than the vapor compressing turbine 20 of the above primary
embodiment .
PV = nt RT ( E - l )
5 wherein
P: pressure of vapor;
V : volume of the vapor;
T: absolute temperature of the vapor;
R : gas constant; and
nt: summed mole of gases included in the vapor of
volume V.
The vapor in turn passes through the steam conduits R9
of the heat recovering unit 60 under the condition that the
vapor pressure was more increased by both the turbine 20
and the pump 30. While passing through the steam conduits
Rg, the vapor absorbs the heat from the high temperature
vapor reversely flowing about the conduits Rg in the unit
60. The vapor laden with impurities, after being preheated
in the conduits Rg, is introduced into the vapor heating
chamber 43 of the boiler 40 and heated to a temperature of
600 'C - 800 C by the heating means of the boiler 40, thus
to be oxidized or carbonized. The oxidized or carbonized
high temperature vapor returns to the heat recovering unit
60 and reversely flows in the zigzag passage about the
steam conduits R9 in the unit 60. At this time, the new
vapor, which vapor is newly introduced into the unit 60 and
has the relatively low temperature of 60 C - lO0 C, flows
in the steam conduit Rg of the unit 60. In the unit 60, the
vapor which was heated by the vapor heating means of the
boiler 40 is guided by the vertically placed guiding
partitions of the unit 60 to about the steam conduit R9,
thus to exchange the heat with the new vapor as shown in
Figs. 2 and 3.
The vapor, which was preheated to the temperature of
450 'C - 600 'C, is introduced into the vapor heating tube
W0 95ll4640 r~ 167--
~177161
14
42 and into the vapor heating chamber 43 through the fourth
conduit R~, thus to become the oxidized or carbonized vapor
of high temperature of 600 'C - 8.00 'C. Meanwhile, the
vapor, which vapor lost the heating energy and whose
temperature was reduced to 150 'C - 200 'C, is introduced
into the panel type steam chambers 13 and into the steam
chamber 14 of the vaporizer 10 through the sixth conduit R6.
While passing through the panel type steam chambers 13 and
through the steam chamber 14 of the vaporizer 10, the vapor
of 150 'C - 200 'C exchanges the heat with the waste water,
thus to be liquidized and to become the condensed water of
about 80 'C - 120 'C. This is because the high pressure
vapor is liquidized at a high temperature proportional to
its vapor pressure due to the fact that the vapor will be
liquidized at a temperature proportional to the vapor
pressure as represented by the above equation E-1.
The condensed water of about 80 'C - 120 'C in turn is
introduced into the coiled tube R of the container 1
through the seventh conduit R7 having both the pressure
regulator 51 and the drain valve 52. The coiled tube R
secondarily recovers the waste heat from the condensed
water and gives the waste heat to the waste water of the
container 1. The condensed water, after losing the waste
heat, is collected to the condensed water tank 50. On the
other hand, the vapor of the temperature 60 'C - 100 'C,
which vapor was prepared by vaporizing the waste water
using the latent heat recovered by the vaporizer 10, is
introduced into the heat recovering unit 60 through the
overflow preventing chamber 17.
The impurities in the vapor, such as odor, B.O.D. and
C.O.D. which were vaporized along with the vapor and laden
in the vapor, are mi~ced with the predetermined amount of
preheated air supplied by the control valve 21, which valve
21 is placed in front of the vapor inlet port of the
turbine 20. As a result of mixing with the preheated air,
the impurities of the vapor become oxidizable impurities.
wossll464o F.l/~r~l 167
2177~6~
The o~idizable impurities are introduced into the vapor
heating means of the boiler 40, that is, the vapor heating
tube 42 and the vapor heating chamber 43. Therefore, the
impurities are oxidized and burnt under the high
temperature atmosphere of 600 'C - 800 'C in the boiler 40,
thus to be removed from the vapor. Alternatively, the
vapor laden with the impurities may be carbonized under the
high temperature atmosphere of 600 'C - 800 C without
addition of preheated air in accordance with
characteristics of the vapor, thus to remove the impurities
such as odor, B.O.D. and C.O.D. from the vapor. The vapor
heating energy, which energy was applied to the vapor by
the vapor heating means of the boiler 40 so as to generate
the high temperature atmosphere, is recovered by the unit
60 and reused in preheating the low temperature vapor in
the unit 60. In this regard, the apparatus of this
invention saves the vapor heating energy by the amount of
recovered energy used in preheating the vapor in the unit
60 .
It should be understood that the apparatus of this
invention may improve its energy efficiency by thermally
insulating the container 1, the vaporizer 10, the au2ciliary
boiler 40 and etc
In order to measure the operational effect of the
apparatus and of the method of this invention, an example
was carried out as follows. That is, excretions as the wet
material to be vaporized was heated, oxidized and burnt at
620 'C or heated and carbonized at 620 'C. The results are
shown in the following Table (T-1). As shown in the Table
(T-1), the wet material treated using the apparatus of the
invention and in accordance with the method of the
invention can be most effectively purified.
Wo 95114640 1 .~ t ~ 16~
2i~71~ 16
Table ( T-1 )
Contents Standard Results
( A ) ( B )
pH 5.8 - 8.6 9.0 9.8
COD 150(mg/Q ) 6.4(mg/Q ) 6.6(mg/Q )
10BOD l5o(mg/Q ) 5.6(mg/Q ) 5.9(mg/Q )
SS150(mg/Q ) 4.0(mg/Q ) 4.5(mg/Q )
N-Hexane 30(mg/Q ) 0.8(mg/Q ) 4.0(mg/Q )
T - N 60(mg/Q ) 16.1(mg/Q ) 16.5(mg/Q )
T - P 8(mg/Q ) 0.033(mg/Q ) 0.034(mg/Q )
15NH~-N - 5.358(mg/Q ) 4.632(mg/Q )
As described above, the present invention reduces the
cost for production of the vaporizing and concentration
drying apparatus and for operation of the apparatus in
20 comparison with the conventional vaporizing apparatus, thus
to provide economic advantage for the user. The apparatus
also keeps its improved performance, so that the apparatus
can prepare good distilled water with low cost and is wide
used for vaporization and concentration drying of poisonous
25 waste water and of environmental polluting waste water, and
for vaporization, concentration and drying of waste sludge.
Furthermore, the heat recovering unit of the apparatus of
the invention recovers vapor heating energy, which energy
was applied to the vapor by heating means of a boiler for
30 heating the vapor to a high temperature and for removing
the impurities laden in the vapor, such as odor, B.O.D. and
C . O . D . . The recovered energy is reused in preheating the
vapor which is newly introduced into the heat recovering
unit. In this regard, the apparatus of the invention saves
35 the heating energy by the amount of recovered energy used
in preheating the vapor in the heat recovering unit.
WO 95/14640 ~17 7 1 6 ~ F~ [ 167
Although the preferred embodiments of the present
invention have been disclosed for illustrative purposes,
those skilled in the art will appreciate that various
modifications, additions and substitutions are possible,
5 without departing from the scope and spirit of the
invention as disclosed in the ~ -nying claims.
