Note: Descriptions are shown in the official language in which they were submitted.
HIGH EFFICIENCY COMBUSTION CONTROL SYSTEM AND METHOD THEREOF
Technical Field
[0001] The invention relates to a high efficiency combustion system and a
method thereof, in
particular to a control system and a method which can improve evaporation rate
and obtain
optimal calorific value.
Background
[0002] Gaseous fuel or premixed fuel high efficiency combustion technology,
which gasifies
liquid fuel into gaseous fuel for combustion. The existing control technology
is pressure and
temperature control, during the evaporation, the higher the evaporation rate,
the more is the
energy consumed for the heating; the higher the pressure, the lower is the
evaporation rate.
[0003] Therefore, in the industry, pressure is generally used for gas supply
control to adjust the
fuel flow rate. When the fuel flow rate decreases, the work of the air
compressor is increased to
drive more air into the evaporation tank, reducing the evaporation rate,
causing incomplete
evaporation, directly ejecting the liquid fuel and resulting in incomplete
combustion.
Summary
[0004] In view of this, the invention aims to improve the disadvantages of the
existing gas
supply device or gas supply control, thereby achieving the effect of improving
the evaporation
rate and the combustion rate.
[0005] To achieve the above objectives, the present invention provides a high
efficiency
combustion system, including:
a evaporation unit;
a gas remixing zone coupled to the evaporation unit;
a combustion unit coupled to the gas remixing zone;
a first gas detecting unit arranged in the evaporation unit;
1
CA 3012983 2019-11-26
a second gas detecting unit arranged in the gas remixing zone; and an air
supply unit coupled to
the gas remixing zone.
[0006] The high efficiency combustion system, further includes an air storage
unit, an air
compression unit and an air drying unit, the air compression unit is coupled
to the air drying unit,
the air drying unit is coupled to the air storage unit, and the air storage
unit is coupled to the
evaporation unit through a pipeline having a pneumatic control valve, a manual
check valve and
a pressure gauge.
[0007] The high efficiency combustion system, further includes an energy
storage unit coupled to
the evaporation unit through a pipeline having a pump, the pump is a pneumatic
diaphragm
pump.
[0008] In the high efficiency combustion system, the evaporation unit is
coupled to the gas
remixing zone through a pipeline having a pneumatic control valve, a manual
check valve and a
pressure gauge.
[0009] The high efficiency combustion system, further includes a heat source
coupled to the
evaporation unit.
[0010] In the high efficiency combustion system, the evaporation unit has an
exhaust module, the
combustion unit has a waste heat recovery and steam-dump module and a
discharge module, and
the waste heat recovery and steam-dump module passes through the gas remixing
zone through a
pipeline and is coupled to the heat source.
[0011] The present invention also provides a high efficiency combustion
method, including the
following steps:
detecting the gas concentration of the first gaseous fuel, the first gas
detecting unit detects the
first gas concentration of a specific gas in the first gaseous fuel of the
evaporation unit;
providing the air to the first gaseous fuel, the evaporation unit provides the
first gaseous fuel to
the gas remixing zone, and the air supply unit supplies air to the first
gaseous fuel according to
2
CA 3012983 2019-11-26
the first gas concentration, the first gaseous fuel is mixed with the air to
form the second gaseous
fuel; and
detecting the gas concentration of the second gaseous fuel, the second gas
detecting unit detects
the second gas concentration of the specific gas in the second gaseous fuel,
if the second gas
concentration is lower than or beyond the setting range, the air supply unit
stops supplying air to
the first gaseous fuel.
[0012] The high efficiency combustion method, further includes the step of
evaporating the
liquid fuel, the air storage unit supplies the stored air to the evaporation
unit, and the energy
storage unit supplies the stored liquid fuel to the evaporation unit, and the
liquid fuel and the air
are mixed in the evaporation unit to form the first evaporating fuel.
[0013] The high efficiency combustion method, in the step of evaporating the
liquid fuel, the air
compression unit pressurizes the air and sends the air to the air drying unit,
the air drying unit
dries the air, and the dried air is sent to the air storage unit, and the air
storage unit stores the air;
the liquid fuel can be heavy oil, diesel oil, petroleum gas, natural gas or
hexane; the specific gas
can be oxygen, hydrogen, hydrocarbon, or inert gas.
[0014] The high efficiency combustion method, further includes the step of
supplying the second
gaseous fuel to the combustion unit, the second gaseous fuel in the gas
remixing zone enters the
combustion unit for combustion.
[0015] In summary, the present invention uses the first gas detecting unit and
the second gas
detecting unit to detect the concentration of the specific gas of the first
gaseous fuel or the
second gaseous fuel respectively. And air is supplied to the liquid fuel or
the first gaseous fuel
according to the gas concentration, so that the evaporation rate is changed,
and the calorific value
is changed accordingly to obtain the optimal calorific value and the optimal
combustion
efficiency.
Brief Description of the Drawings
3
CA 3012983 2019-11-26
[0016]
FIG. 1 is a schematic diagram of a high efficiency combustion system of the
present invention.
FIG. 2 is a flowchart of a high efficiency combustion method of the present
invention.
[0017] Description of reference numerals: 10- energy storage unit; 100- pump;
11 - air storage
unit; 110 - pneumatic control valve; 111 - manual check valve; 112 - pressure
gauge; 12 -
evaporation unit; 120 - exhaust module; 121 - pneumatic control valve; 122 -
manual check
valve; 123 - pressure gauge; 13 - heat source; 14 - combustion unit; 140 -
waste heat recovery
and steam-dump module; 141 - discharge module; 15 - air supply unit; 16 -
first gas detecting
unit; 17 - second gas detecting unit; 18 - gas remixing zone; 20 - air drying
unit; 21 - air
compression unit; S1¨S5 - steps.
Detailed Description
[0018] Detailed implementation of the present invention is described with
reference to the
following specific embodiments, those of ordinary skill in the art can easily
understand the other
advantages and effects of the present invention by the contents disclosed in
this specification.
[0019] With reference to FIG. 1 , the present invention is a high efficiency
combustion system
including the energy storage unit 10, the air storage unit 11, the evaporation
unit 12, the heat
source 13, the combustion unit 14, the air supply unit 15, the first gas
detecting unit 16, the
second gas detecting unit 17, and the air remixing zone 18.
[0020] The energy storage unit 10 is a storage unit for a liquid hydrocarbon
fuel (also simply
referred to as liquid fuel). The hydrocarbon fuel can be heavy oil, diesel
oil, petroleum gas,
natural gas, or hexane. The energy storage unit 10 is coupled to the
evaporation unit 12 through a
pipeline. The pipeline is provided with the pump 100, and the pump 100 is a
pneumatic
diaphragm pump.
[0021] The air storage unit 11 is coupled to the evaporation unit 12 through a
pipeline. The
pipeline is provided with the pneumatic control valve 110, the manual check
valve 111 and the
4
CA 3012983 2019-11-26
pressure gauge 112. The air storage unit 11 is coupled to an air drying unit
20 through a pipeline.
The air drying unit 20 is coupled to the air compression unit 21 through a
pipeline. The air
compression unit 21 can be an air compressor.
[0022] The evaporation unit 12 includes the exhaust module 120 used for
maintaining and
cleaning the evaporation unit 12. The evaporation unit 12 is coupled to the
heat source 13. The
evaporation unit 12 is coupled to the gas remixing zone 18 through a pipeline.
The pipeline is
provided with the pneumatic control valve 121, the manual check valve 122 and
the pressure
gauge 123.
[0023] The combustion unit 14 includes the waste heat recovery and steam-dump
module 140
and the discharge module 141. The waste heat recovery and steam-dump module
140 passes
through the gas remixing zone 18 through a pipeline and is coupled to the heat
source 13.
[0024] The air supply unit 15 is coupled to the gas remixing zone 18 through a
pipeline. The air
supply unit 15 can be an air compressor.
[0025] The first gas detecting unit 16 is arranged in the evaporation unit 12;
the second gas
detecting unit 17 is arranged in the gas remixing zone 18;
[0026] With reference to FIG. 2 , the present invention is a high efficiency
combustion method,
including the following steps:
step Sl, evaporating the liquid fuel. The air compression unit 19 pressurizes
the air and sends the
air to the air drying unit 18. The air drying unit 15 dries the air, and the
dried air is sent to the air
storage unit 11. The air storage unit 11 stores this air.
[0027] The air storage unit 11 sends the stored air to the evaporation unit
12. The energy storage
unit 10 sends the stored liquid fuel to the evaporation unit 12. The liquid
fuel and the air are
mixed in the evaporation unit 12 to form the first gaseous fuel.
step S2, detecting the gas concentration of the first gaseous fuel. The first
gas detecting unit 16
detects the first gas concentration of the specific gas in the first gaseous
fuel. The specific gas
CA 3012983 2019-11-26
can be oxygen, hydrogen, hydrocarbons or inert gas.
step S3, providing the air to the first gaseous fuel. The evaporation unit 12
provides the first
gaseous fuel to the gas remixing zone 18. The air supply unit 15 provides air
to the first gaseous
fuel according to the first gas concentration. The first gaseous fuel is mixed
with the air to form a
second gaseous fuel.
step S4, detecting the gas concentration of the second gaseous fuel. The
second gas detecting unit
17 detects the second gas concentration of the specific gas in the second
gaseous fuel. If the
second gas concentration is lower than or beyond the setting range, the air
supply unit 15 stops
the air supply or adjusts the supply flow rate to the first gaseous fuel.
step S5, providing the second gaseous fuel to the combustion unit. The second
gaseous fuel in
the gas remixing zone 18 enters the combustion unit 13 for combustion.
[0028] In summary, when the air of the air storage unit 11 enters the
evaporation unit 12, the
pneumatic control valve 110 controls whether the air can flow into the
evaporation unit 12 or
controls the flow rate of air into the evaporation unit 12; the manual check
valve 111 prevents the
air or the first gaseous fuel of the evaporation unit 12 from flowing back to
the air storage unit
11; the pressure gauge 112 detects the pressure of the air flowing into the
evaporation unit 12.
[0029] When the liquid fuel enters the evaporation unit 12 from the energy
storage unit 10, the
pump 100 pressurizes the liquid fuel to gasify.
[0030] When the first gaseous fuel enters the gas remixing zone 18, the
pneumatic control valve
110 controls whether air can flow into the gas remixing zone 18 or the flow
rate of air flowing
into the evaporation unit 12; the manual check valve 111 prevents the air or
the first gaseous fuel
of the gas remixing zone 18 from flowing back to the air storage unit 11; the
pressure gauge 112
detects the pressure of the air flowing into the remix zone 18.
[0031] After the second gaseous fuel is combusted in the combustion unit 14,
the second gaseous
fuel after combusting generates exhaust gas and steam. The exhaust gas is
discharged to the
outside of the combustion unit 14 by the discharge module 141. The steam is
directed to the heat
source 13 by the waste heat recovery and steam-dump module 140 to heat the
first gaseous fuel
6
CA 3012983 2019-11-26
in the evaporation unit 12 and the second gaseous fuel in the gas remixing
zone 18.
[0032] In the present embodiment, the above mentioned specific gas can be
oxygen, and the first
gas concentration and the second gas concentration are the oxygen
concentrations in the first
gaseous fuel or the second gaseous fuel.
[0033] As described above, the change of the first gas concentration or the
second gas
concentration affects the evaporation rate, when the evaporation rate
increases, the fuel heating
value also increases.
[0034] The following table shows an example where hexane is used:
Evaporation unit 1.4 1.4 1.6
pressure(kg/cm2)
Combustion 0.68+0.17 0.5+0.09 0.92+0.15
efficiency index
Combustion average 1.27 1.25 1.32
consumption(m3/min)
Average air-fuel ratio 5.06+0.71 4.2+0.19 7.5+0.5
(m3/m3)
Fuel calorific value 7647 8912 5452
(kcal/m3)
Gas fuel density 1.7 1.77 1.59
(kg/m3)
Fuel evaporation rate 0.209 0.240 0.155
(m3 /min)
7
CA 3012983 2019-11-26
[0035] As can be seen from the above table, when the fuel evaporation rate
increases, the fuel
calorific value also increases. The present invention uses the first gas
detecting unit 16 and the
second gas detecting unit 17 to detect the concentration of the specific gas
of the first gaseous
fuel or the second gaseous fuel respectively. And air is supplied to the
liquid fuel or the first
gaseous fuel according to the gas concentration, so that the evaporation rate
is changed, and the
calorific value is changed accordingly to obtain the optimal calorific value
and the optimal
combustion efficiency.
[0036] The above description is merely illustrative and not restrictive of the
invention, and it can
be understood by those of ordinary skill in the art that many modifications,
variations or
equivalents can be made without departing from the spirit and scope defined by
the claims,
which is still within the protection scope of the invention.
8
CA 3012983 2019-11-26
