AU2020103269A4 - Stable and environmentally friendly combustion method for biomass gasification combustible gas, and environmentally friendly combustion chamber - Google Patents
Stable and environmentally friendly combustion method for biomass gasification combustible gas, and environmentally friendly combustion chamber Download PDFInfo
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- AU2020103269A4 AU2020103269A4 AU2020103269A AU2020103269A AU2020103269A4 AU 2020103269 A4 AU2020103269 A4 AU 2020103269A4 AU 2020103269 A AU2020103269 A AU 2020103269A AU 2020103269 A AU2020103269 A AU 2020103269A AU 2020103269 A4 AU2020103269 A4 AU 2020103269A4
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- air volume
- combustible gas
- cavity body
- combustion
- stage cavity
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2700/00—Special arrangements for combustion apparatus using fluent fuel
- F23C2700/04—Combustion apparatus using gaseous fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Incineration Of Waste (AREA)
Abstract
An environmentally friendly combustion chamber for stable combustion of
biomass gasification combustible gas. The combustion chamber is divided into a
first stage cavity body (45) and a second stage cavity body (48) by a honeycomb
shaped heat storage body (46). A combustion pipe (41) is connected to a biomass
gas inlet and a primary air distribution pipe (54), the combustion pipe (41) is
connected to the first stage cavity body (45), and an ignition gun (42) and a
thermocouple Ti are arranged on the first stage cavity body (45). A secondary air
distribution pipe (47), opposite the honeycomb-shaped heat storage body (46),
and a thermocouple T2 are arranged within the second stage cavity body (48),
and the second stage cavity body (48) is connected to an outlet high temperature
flue gas pipe (51). The primary air distribution pipe (54), a primary air volume
adjustment valve (52), the secondary air distribution pipe (47) and a secondary
air volume adjustment valve (53) are connected together to an air supply fan (49),
and a controller (50) is connected to the thermocouple TI, the thermocouple T2,
the primary air volume adjustment valve (52), the secondary air volume
adjustment valve (53) and the air supply fan (49). The combustion chamber solves
the problems of unstable combustion flames in traditional combustors, and high
nitrogen oxide amounts in tail flue gas.
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Fig. 1
Description
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Fig. 1
[0001] The invention relates to a stable and environmentally friendly
combustion chamber for biomass gasification combustible gas and a stable and
environmentally friendly combustion method for biomass gasification combustible
gas, belonging to the field of biomass energy and solid waste treatment.
[0002] In the current biomass gasification technology, the combustible gas
produced by gasification has the following characteristics:
[0003] 1) the gasification of combustible gas due to the diversity of biomass
materials (materials are different in nature, shape is different, water content is not
the same, etc.), the calorific value of combustible gas is unstable, and air is used as
agasifying agent, for the generation of combustible gas, the high can reach about
1300kcal, and the low can reach about 850kcal; and
[0004] 2) the gasification of combustible gas contains more kinds of impurities,
including tar, water, and dust.
[0005] At present, the utilization of biomass gasification combustible gas is
mainly in the following ways:
[0006] 1) through deep gas combustion purification technology, the purified
combustible gas can be used to provide power to the internal combustion engine
and provide combustion to the boiler, but a large amount of extract liquid and tar
are produced during the purification process, but if it is not used properly, it will
pollute the environment; and
[0007] 2) the combustible gas is not purified, and the hot gas is directly supplied
to the boiler for combustion.
[0008] In China, when small and medium-sized boilers are prohibited from
burning coal, a large number of small and medium-sized boilers must be rebuilt,
and biomass gasification carbon and gas cogeneration technologies are the first
choice in terms of economy and environmental protection.
[0009] The traditional combustible gas combustion technology uses a gas burner,
while the traditional burner is developed on the basis of natural gas, the fixed
calorific value of the gas and the fixed air volume cannot be adapted to the
instability of the biomass combustible gas calorific value, if such a burner is used,
the following problems may occur:
[0010] 1) the air distribution system does not adapt to the change of the calorific
value, if the fire is often broken and the combustion is unstable, it is prone to safety problems:
[0011] 2) if the automatic igniter is contaminated by tar or water, it may cause
false ignition or misfire.
[0012] Therefore, there is an urgent need to develop an environmentally friendly
combustion chamber that can adapt to the stable combustion of biomass hot gas.
[0013] The present invention provides an stable and environmentally friendly
combustion chamber for biomass gasification combustible gas, the purpose of
which is to adapt to the characteristics of biomass gasification combustible gas,
and solves the problem of biomass combustible gas calorific value fluctuation due
to the instability of the combustion flame of the traditional burner and the high
nitrogen oxide amounts in the tail flue gas after combustion of the combustible gas.
[0014] TECHNICAL SOLUTION OF THE INVENTION
[0015] The present invention provides an environmentally friendly combustion
chamber for stable combustion of biomass gasification combustible gas. The
combustion chamber is divided into a first stage cavity body 45 and a second stage
cavity body 48 by a honeycomb-shaped heat storage body 46. A combustion pipe
41 is connected to a biomass gas inlet and a primary air distribution pipe 54, the
combustion pipe 41 is connected to the first stage cavity body 45, and an ignition gun 42 and a thermocouple TI are arranged on the first stage cavity body 45. A secondary air distribution pipe 47, opposite the honeycomb-shaped heat storage body 46, and a thermocouple T2 are arranged within the second stage cavity body
48, and the second stage cavity body 48 is connected to an outlet high temperature
flue gas pipe 51. The primary air distribution pipe 54, a primary air volume
adjustment valve 52, the secondary air distribution pipe 47 and a secondary air
volume adjustment valve 53 are connected together to an air supply fan 49, and a
controller 50 is connected to the thermocouple TI, the thermocouple T2, the
primary air volume adjustment valve 52, the secondary air volume adjustment
valve 53 and the air supply fan 49.
[0016] The combustion chamber adopts a honeycomb-shaped heat storage body,
and the heat storage body dissipates heat slowly, ensuring that the temperature
thereof is always higher than the combustible gas burning point, that is, ensuring
stable combustion of the low calorific value combustible gas, and the combustion
chamber adopts a two-stage combustion chamber and a two-stage automatic air
distribution structure to control the combustion temperature and create a reducing
atmosphere for the combustion of combustible gas, so that achieve the purpose of
controlling the nitrogen oxide amounts of the exhaust gas.
[0017] Therefore, the combustion chamber is suitable for stable and
environmentally friendly combustion chamber for biomass gasification combustible gas, and solves the problem of biomass combustible gas calorific value fluctuation due to the instability of the combustion flame of the traditional burner and the high nitrogen oxide amounts in the tail flue gas after combustion of the combustible gas.
[0018] The distance between the honeycomb-shaped heat storage body (46) and
the end of the inlet combustion pipe (41) is 1.1-1.3 times of the length of the
combustion flame, the heat storage body is coaxial with the combustion pipe, the
middle portion of the heat storage body has a non-opening area that is as large as
the cross-sectional area of the combustion pipe, the peripheral portion of the heat
storage body is opened a through hole, the flow area of the through hole is 40-50%
of the cross-sectional area of the peripheral portion of the heat storage body, the
material of the heat storage body is zirconium corundum brick or magnesia chrome
brick, etc. The heat storage body maintains a high temperature state, and the low
calorific value combustible gas is directly oxidized and exothermic in aerobic and
high temperature conditions, thereby ensuring stable operation of the system when
the calorific value of the biomass combustible gas fluctuates greatly.
[0019] The primary air volume entering the combustion pipe through the
primary air distribution pipe (54) is about 90% of the required air volume of the
combustible gas; the secondary air volume entering the second stage cavity body
through the secondary air distribution pipe is 10% of the required air volume of the combustible gas; the temperature of the first stage cavity body is below 1000°C.
[0020] The primary air volume is about 90% of the required air volume of the
combustible gas, and the secondary air volume is about 10% of the required air
volume of the combustible gas, so that the combustion is performed under a
reducing atmosphere; and second, the controller obtains the overheat temperature
signal from the thermocouple TI, adjusting the primary air volume adjustment
valve 52 and the secondary air volume adjustment valve 53 to reduce the primary
air volume, and simultaneously increase the secondary air volume, and control the
temperature of the primary cavity body to be below 1000°C, thereby reach the
purpose of reducing the generation of thermal and fuel-type nitrogen oxides.
[0021] The present invention also provides a stable and environmentally
friendly combustion method for biomass gasification combustible gas for reducing
the generation of nitrogen oxides.
[0022] The stable and environmentally friendly combustion method of the
biomass gasification combustible gas according to the present invention adopts the
above-mentioned environmentally friendly combustion chamber, and a controller
by controlling the opening degree of the primary air volume adjustment valve
52 and the secondary air volume adjustment valve 53, the air volume entering the
combustion pipe through the primary air distribution pipe 54 is about 90% of the
required air volume of the combustible gas, the secondary air volume entering the second stage cavity body through the secondary air distribution pipe 47 is 10% of the required air volume of the combustible gas.
[0023] In the above-mentioned stable and environmentally friendly combustion
method for biomass gasification combustible gas, the controller monitors the
temperature signal of the first stage cavity body from the thermocouple TI in real
time; if the temperature in the first stage cavity body exceeds 1000°C, the
controller adjusts the primary air volume adjustment valve (52) and the secondary
air volume adjustment valve (53) to reduce the primary air volume and
simultaneously increase the secondary air volume, so that the temperature of the
first stage cavity body is below 1000°C.
[0024] The function of the controller 50 is that:
[0025] 1)controlling the primary air volume to be about 90% of the required air
volume of the combustible gas, and the secondary air volume is about 10% of the
required air volume of the combustible gas, so that the combustion is performed
under a reducing atmosphere, and reducing the generation of the nitrogen oxides;
and
[0026] 2) controlling the temperature of the first stage cavity body is below
1000°C, the controller obtains the overheat temperature signal from the
thermocouple TI, and adjusts the primary air volume adjustment valve 52 and the
secondary air volume adjustment valve 53 to reduce the primary air volume, and simultaneously increase the secondary air volume, so that reducing the generation of thermal nitrogen oxides. Thereby achieve the purpose of reducing the generation of nitrogen oxides and being more environmentally friendly.
[0027] ADVANTAGES OF THE INVENTION
[0028] 1) The burner can adapt to the wide fluctuation of the calorific value of
the combustible gas. The combustion chamber uses honeycomb-shaped heat
storage body, and the heat storage body dissipates heat slowly, ensuring that the
temperature thereof is always higher than the combustible gas burning point , that
is, ensuring the stable combustion of the low calorific value.
[0029] 2) The combustion chamber adopts a two-stage combustion chamber
and a two-stage automatic air distribution structure to control the combustion
temperature and create a reducing atmosphere for combustible gas, so that achieve
the purpose of controlling the nitrogen oxide amounts of the exhaust gas.
[0030] Therefore, the combustion chamber is suitable for stable and
environmentally friendly combustion chamber for biomass gasification
combustible gas.
[0031] Fig. 1 is a schematic structural view of a stable and environmentally
friendly combustion chamber for biomass gasification combustible gas;
[0032] Fig. 2 is a schematic view of a heat storage body;
[0033] Fig. 3 is a schematic view of another heat storage body;
[0034] Fig. 4 is a schematic view of a secondary air distribution pipe;
[0035] Fig. 5 is a left side view of Fig. 4;
[0036] Fig. 6 is a partial enlarged view of Fig. 5.
[0037] Reference number in drawings are as follows in sequence:
[0038] In the drawings, 41 is a combustion pipe, 42 is an igniter, 43 is a fire
door, 45 is a first stage cavity body, 46 is a heat storage body, 461 is an
intermediate portion of the heat storage body, 462 is a peripheral portion of the
heat storage body (open area), 463 is a through hole, 47 is a secondary air
distribution pipe, 471 is a secondary air distribution pipe air outlet, 48 is a second
stage cavity body, 49 is a blower, 50 is a controller, 51 is an outlet high
temperature flue gas pipe, 52 is a primary air volume adjustment valve, 53 is a
secondary air volume adjustment valve, and 54 is a primary air distribution pipe.
[0039] Referring to Fig. 1, a stable and environmentally friendly combustion
chamber for biomass gasification combustible gas comprising: a combustion pipe
41 is connected to a biomass gas inlet and a primary air distribution pipe 54; the
combustion pipe 41 is connected to a primary chamber body 45. The first stage cavity body 45 is provided with an ignition gun 42, a fire door 43, and a thermocouple T. The rear end of the first stage cavity body is connected to the honeycomb-shaped heat storage body 46, and the rear side of the honeycomb-shaped heat storage body 46 is connected to the second stage cavity body 48, the second stage cavity body 48 (the rear side of the honeycomb-shaped heat storage body 46) is provided with a secondary air distribution pipe 47, a thermocouple T2, the second stage cavity body 48 is connected to the outlet high temperature flue gas pipe 51, the primary air distribution pipe 54 is connected to the air blower 49 through the primary air volume adjustment valve 52 and the secondary air distribution pipe 47 is connected to the air blower 49 through the secondary air volume adjustment valve 53, and the controller 50 is connected to the thermocouple TI, the thermocouple T2, the primary air volume adjustment valve 52, the secondary air volume adjustment valve 53, and the air supply fan 49, thereby formed a combustion chamber.
[0040] The function of the controller 50 is that:
[0041] 1) controlling the primary air volume to be about 90% of the required air
volume of the combustible gas, the secondary air volume is about 10% of the
required air volume of the combustible gas; and
[0042] 2) the temperature of the first stage cavity body is controlled at 1000°C,
the controller obtains the overheat temperature signal from the thermocouple TI, adjusting the primary air volume adjustment valve 52 and the secondary air volume adjustment valve 53 to reduce the primary air volume and simultaneously increase the secondary air volume.
[0043] Referring to the heat storage bodies shown in Figs. 2 and 3, the shape of
the heat storage body 46 may vary depending on the shape of the cavity body, and
may be a square shape or a circular shape. The distance between the front end
surface of the heat storage body 46 and the end portion of the inlet combustion
pipe 41 is 1.1-1.3 times of the length of the combustion flame. The flow area of the
through hole of the heat storage body is 40-50% of the cross-sectional area of the
honeycomb-shaped heat storage body, and the intermediate portion 461 of the heat
storage body is not opened, and the cross-sectional area of the non-opening area is
substantially the same as the cross-sectional area of the combustion tube, and the
peripheral portion 462 of the heat storage body is an open area, and the area is
provided with a through hole 463, and the sum of the flow areas (cross-sectional
areas) of the through holes is 40-50% of the cross-sectional area of the open area of
the peripheral portion of the heat storage body, the heat storage body material is
zirconium corundum brick or magnesia chrome brick which has a heat storage
capacity and a high temperature resistance.
[0044] Referring to the secondary air distribution pipe shown in Figs. 4-6, the
secondary air distribution pipe 47 is located at a distance of 100-200cm from the rear end surface of the heat storage body 46, and the air distribution pipe is also vary according to the shape of the cavity body, and may be a square shape or may be designed in a circular shape, and the secondary air distribution pipe 47 has a secondary air pipe outlet 471 uniformly open toward the side of the heat accumulator 46.
[0045] WORKING PROCESS EXAMPLE
[0046] The biomass combustible gas produced by the gasification of straw or
wood chips, assuming an initial calorific value of 1000 kcal, which containing tar,
water, and a small amount of dust, which enters the combustion chamber through
the combustion pipe of the combustion chamber.
[0047] During the initial air supply, the primary air volume sent into the first
stage cavity body is 90% of the total air volume, and the secondary air volume sent
into the second stage cavity body is 10% of the total air volume.
[0048] It forms an oxygen-limited combustion environment in the first stage
cavity body, while the fuel-type nitrogen oxides is produced under an oxidizing
atmosphere, and the amount of the combustion-type nitrogen oxide amounts
produced by the first stage cavity body is greatly reduced.
[0049] There is also 10% of the combustible gas that is not burned; the oxygen
is supplied through the second stage cavity body for combustion. The temperature
of the first stage cavity body is controlled to be below 1000°C by controlling the air supply volume of the first stage cavity body. If the temperature is exceeded, the controller will automatically reduce the amount of the air volume, thus reduces the generation of thermal nitrogen oxides.
[0050] The heat storage body keeps the temperature under the burning of the
combustible gas combustion flame. When the combustible gas has large
fluctuations, for example, the calorific value of the combustible gas suddenly drops
to 650Kacl, at this time, the flame may be instantaneously broken due to the air
distribution, when the combustible gas is directly sprayed onto the
high-temperature heat storage body and re-ignites immediately (even if it can't be
burned immediately, the low-calorific value combustible gas will be oxidized
immediately). At the same time, the controller automatically adjusts the supply air
volume to ensure oxygen supply, thus ensuring that the combustible gas does not
fluctuate due to the calorific value. The non-combustible gas will not accumulate
in the subsequent boiler to cause a safety accident, and also ensuring the stable
operation of the combustion chamber.
[0051] Therefore, the combustion chamber of the present invention can realize
the stable combustion of the biomass gasification hot gas with the fluctuation of
the calorific value, and reduce the nitrogen oxide amounts, thereby ensuring the
environmental protection of the combustion.
Claims (6)
1. A stable and environmentally friendly combustion chamber for biomass
gasification combustible gas, characterized in that:
the combustion chamber is divided into a first stage cavity body (45) and a
second stage cavity body (48) by a honeycomb-shaped heat storage body (46);
a combustion pipe (41) is connected to a biomass gas inlet and a primary air
distribution pipe (54), the combustion pipe (41) is connected to the first stage
cavity body (45), and an ignition gun (42) and a thermocouple TI are arranged on
the first stage cavity body (45), a secondary air distribution pipe (47), opposite to
the honeycomb-shaped heat storage body (46), and a thermocouple T2 are arranged
within the second stage cavity body (48) and the second stage cavity body (48) is
connected to the outlet high temperature flue gas pipe (51), the primary air
distribution pipe (54), a primary air volume adjustment valve (52), the secondary
air distribution pipe (47) and a secondary air volume adjustment valve (53) are
connected to a air supply fan (49),and a controller (50) is connected to the
thermocouple TI, the thermocouple T2, the primary air volume adjustment valve
(52), the secondary air volume adjustment valve (53), and the air supply fan (49).
2. A stable and environmentally friendly combustion chamber for biomass
gasification combustible gas according to claim 1, characterized in that:
the distance between the honeycomb-shaped heat storage body (46) and the end of the inlet combustion pipe (41) is 1.1-1.3 times of the length of the combustion flame, the heat storage body is coaxial with the combustion pipe, the middle portion of the heat storage body has a non-opening area that is as large as the cross-sectional area of the combustion pipe, the peripheral portion of the heat storage body is opened a through hole, the flow area of the through hole is 40-50% of the cross-sectional area of the peripheral portion of the heat storage body, the material of the heat storage body is zirconium corundum brick or magnesia chrome brick.
3. A stable and environmentally friendly combustion chamber for biomass
gasification combustible gas according to claim 1, characterized in that:
the primary air volume entering the combustion pipe through the primary air
distribution pipe (54) is about 90% of the required air volume of the combustible
gas;
the secondary air volume entering the second stage cavity body through the
secondary air distribution pipe is 10% of the required air volume of the
combustible gas;
the temperature of the first stage cavity body is below 1000°C.
4. A stable and environmentally friendly combustion method for biomass gasification combustible gas, characterized in that: using the stable and environmentally friendly combustion chamber for biomass gasification combustible gas according to any one of claims 1-3, a controller (50) by controlling the opening degree of the primary air volume adjustment valve (52) and the secondary air volume adjustment valve (53), the air volume entering the combustion pipe through the primary air distribution pipe (54) is about 90% of the required air volume of the combustible gas, the secondary air volume entering the second stage cavity body through the secondary air distribution pipe (47) is 10% of the required air volume of the combustible gas.
5. A stable and environmentally friendly combustion method for biomass
gasification combustible gas according to claim 4, characterized in that:
the controller monitors the temperature signal of the first stage cavity body
from the thermocouple Ti in real time,
if the temperature in the first stage cavity body exceeds 1000°C, the controller
adjusts the primary air volume adjustment valve (52) and the secondary air volume
adjustment valve (53) to reduce the primary air volume and simultaneously
increase the secondary air volume, so that the temperature of the first stage cavity
body is below 1000°C.
biomass gas inlet into the boiler -1/3-
Fig.1
-2/3-
Fig.3 Fig.2
Fig.4 -3/3-
Fig.
6 Fig.5
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020103269A AU2020103269A4 (en) | 2020-11-05 | 2020-11-05 | Stable and environmentally friendly combustion method for biomass gasification combustible gas, and environmentally friendly combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020103269A AU2020103269A4 (en) | 2020-11-05 | 2020-11-05 | Stable and environmentally friendly combustion method for biomass gasification combustible gas, and environmentally friendly combustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020103269A4 true AU2020103269A4 (en) | 2021-01-14 |
Family
ID=74103493
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020103269A Ceased AU2020103269A4 (en) | 2020-11-05 | 2020-11-05 | Stable and environmentally friendly combustion method for biomass gasification combustible gas, and environmentally friendly combustion chamber |
Country Status (1)
| Country | Link |
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| AU (1) | AU2020103269A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237109A (en) * | 2021-05-31 | 2021-08-10 | 宁波方太厨具有限公司 | Smoke and stove coordinated control device, kitchen range and range hood |
-
2020
- 2020-11-05 AU AU2020103269A patent/AU2020103269A4/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237109A (en) * | 2021-05-31 | 2021-08-10 | 宁波方太厨具有限公司 | Smoke and stove coordinated control device, kitchen range and range hood |
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