CN213327474U - Garbage gasification stove flue gas circulating device control system - Google Patents

Garbage gasification stove flue gas circulating device control system Download PDF

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CN213327474U
CN213327474U CN202021763636.9U CN202021763636U CN213327474U CN 213327474 U CN213327474 U CN 213327474U CN 202021763636 U CN202021763636 U CN 202021763636U CN 213327474 U CN213327474 U CN 213327474U
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control valve
pipeline
gas
flue gas
gasification furnace
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陈继华
李香排
葛景春
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Zhejiang Titan Design & Engineering Co ltd
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Zhejiang Titan Design & Engineering Co ltd
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The application discloses a control system of a flue gas circulation device of a garbage gasifier, which comprises a blast furnace gasifier, wherein an air inlet at the lower part of the blast furnace gasifier is connected with an air blower through a No. 1 control valve pipeline, an air outlet at the upper part of the blast furnace gasifier is sequentially connected with a cyclone separator, a secondary combustion chamber, a waste heat boiler, a quench tower, a bag-type dust remover and a draught fan through pipelines, and flue gas discharged by the draught fan is sent to a tail gas treatment system; the pipeline on the second combustion chamber is connected with a blower and solids at the bottom of a cyclone separatorThe outlet is connected with a feed inlet at the side part of the blast furnace gasification furnace through a pipeline. The device divides the flue gas exhausted by the draught fan into one path and sends the one path into the two combustion chambers to carry out partial internal circulation of the flue gas so as to reduce NO generated by combustion in the two combustion chambersXAn amount; one path of the waste enters a gasification furnace to be used as a gasification agent for gasifying the waste; and (3) separating a part of the fuel gas discharged by the cyclone separator, sending the separated part of the fuel gas into a blast furnace gasification furnace, performing partial internal circulation of the fuel gas, degrading dioxin existing in gasification, and enabling the rest of the fuel gas to enter a secondary combustion chamber for incineration to utilize a heat value.

Description

Garbage gasification stove flue gas circulating device control system
Technical Field
The utility model relates to a refuse handling system technical field, concretely relates to rubbish gasification stove flue gas circulation device control system.
Background
Along with the continuous development of economy, the domestic garbage is generated more and more, the components of the garbage are more and more complex, and the national places great importance on garbage treatment and tail gas emission. The current landfill treatment domestic waste occupies the land, wastes resources, and the leachate is easy to leak. The blast furnace gasification technology not only can reduce and harmlessly treat the garbage, but also can recover metal substances in the garbage. The gasification technology of the blast furnace can use biomass carbon to replace fossil fuel, reduce the dependence on petrochemical coal resources, change garbage into combustible gas and change waste into valuable.
At present, the current utilization situation of a garbage gasification furnace generally has the defects of direct discharge of flue gas, smoke exhaust loss, incomplete combustion loss of gas, incomplete gasification and low gas quality. After burning the fuel gas, a large amount of NO is generatedXSecondary pollution of dioxin, fly ash and the like.
Disclosure of Invention
To the above technical problem that prior art exists, the utility model aims to provide a rubbish gasification stove gas recirculation device control system, through divide draught fan exhaust flue gas into send into the secondary combustion chamber all the way, carry out the partial inner loop of flue gas to reduce the NO that the combustion generated in the secondary combustion chamberXAn amount; the gas discharged from the cyclone separator is divided into one path and sent into the blast furnace gasification furnace for partial internal circulation of the gas, so that the quality of the gas is further improved, and the possibility of generation of dioxin is further reduced.
The control system of the flue gas circulation device of the garbage gasifier is characterized by comprising a blast furnace gasifier, wherein a gas inlet at the lower part of the blast furnace gasifier is connected with a blower through a No. 1 control valve pipeline; a gas outlet at the upper part of the cyclone separator is connected with an inlet of a secondary combustion chamber through a pipeline, an outlet of the secondary combustion chamber is sequentially connected with a waste heat boiler and a quenching tower through pipelines, the quenching tower is connected with a bag-type dust remover through a pipeline, and a solid outlet at the bottom of the bag-type dust remover is connected with an ash tank and is connected with a feed inlet at the side part of a blast furnace gasification furnace through the ash tank; the upper gas outlet of the bag-type dust collector is connected with a draught fan through a pipeline, and the flue gas discharged from the gas outlet of the draught fan is sent to a tail gas treatment system; wherein, the second combustion chamber is also connected with a blower for blowing air through a pipeline.
The control system of the flue gas circulating device of the garbage gasification furnace is characterized by further comprising a circulating air feeder; the gas outlet of the induced draft fan is divided into two paths, one path is connected with the tail gas treatment system through a pipeline, the other path is connected with the inlet of the circulating air feeder through a 6# control valve and a pipeline, and the outlet of the circulating air feeder is connected with the second combustion chamber through a 5# control valve and a pipeline to form a flue gas circulating system.
A garbage gasification stove flue gas circulating device control system, its characterized in that the gas outlet of draught fan is provided with and is arranged in detecting NO in the flue gasXThe smoke component detector is in signal connection with the No. 5 control valve through a PLC control system; when the smoke component detector detects NO in the smoke discharged by the induced draft fanXWhen the component content is higher or lower, the opening degree of the 5# control valve is controlled to be increased or decreased through the feedback control of the PLC control system, the smoke discharged by the induced draft fan is divided into one path and sent into the secondary combustion chamber through the circulating air feeder, and partial internal circulation of the smoke is carried out, so that the NO generated by combustion in the secondary combustion chamber is reducedXAmount of the compound (A).
The control system of the flue gas circulating device of the garbage gasification furnace is characterized in that the gas outlet of the circulating blower is divided into two paths, and one path is connected with the second combustion chamber through a No. 5 control valve by a pipeline to form a flue gas circulating system; the other path is connected with an air inlet at the lower part of the blast furnace gasifier through a No. 2 control valve by a pipeline so as to divide the flue gas discharged by the circulating blower into one path and feed the path into the blast furnace gasifier to be used as a gasifying agent;
the gas outlet at the upper part of the cyclone separator is divided into two paths, one path is connected with the inlet of the second combustion chamber through a pipeline, and the other path is connected with the gas inlet at the lower part of the blast furnace gasification furnace through a 4# control valve, a circulating high-temperature fan and a 3# control valve through a pipeline.
The control system of the flue gas circulating device of the garbage gasifier is characterized in that a pipeline between a gas outlet at the upper part of the cyclone separator and an inlet of the secondary combustion chamber is also provided with a device for detecting CO in fuel gas2Water vapor and O2The gas component detector is in signal connection with the 4# control valve, the circulating high-temperature fan and the 3# control valve through a PLC (programmable logic controller) control system; when the gas component detector detects CO in the gas discharged by the cyclone separator2Or when the content of the steam component is higher, the circulating high-temperature fan is started through feedback control of the PLC control system, the No. 4 control valve and the No. 3 control valve are opened, the fuel gas discharged by the cyclone separator is divided into one path and sent into the blast furnace gasification furnace through the circulating high-temperature fan, and partial internal circulation of the fuel gas is carried out;
the gas composition detector is in signal connection with the No. 1 control valve, the air blower and the No. 2 control valve through the PLC control system, and when the gas composition detector detects O in gas discharged by the cyclone separator2When the component content is higher, the PLC control system controls the air blower and the 1# control valve to be turned off in a feedback mode, and the 2# control valve is turned on.
The utility model has the advantages that: the blast furnace gasifier can convert garbage and biomass into energy for use, and the partial internal circulation of the flue gas and the fuel gas is controlled to perform internal circulation on the steam and the fuel gas in the blast furnace gasifier, so that the fuel gas conversion rate is improved, the generation possibility of dioxin is further reduced, the dioxin component in the tail flue gas discharged by the induced draft fan is degraded, and the NO in the tail flue gas discharged by the induced draft fan can be reduced by the flue gas circulation of the secondary combustion chamberXContent of CO carried in tail flue gas discharged from draught fan2The water vapor is an ideal gasification agent of the gasification furnace, and can further improve the quality of fuel gas.
Drawings
FIG. 1 is a schematic structural diagram of a control system of a flue gas circulation device of a garbage gasification furnace according to the present application;
in fig. 1: the device comprises a 1-blast furnace gasification furnace, a 2-cyclone separator, a 3-secondary combustion chamber, a 4-waste heat boiler, a 5-quench tower, a 6-bag dust collector, a 7-induced draft fan, an 8-circulating blower, a 9-circulating high-temperature fan, a 10-blower, a 11-1# control valve, a 12-2# control valve, a 13-3# control valve, a 14-4# control valve, a 15-5# control valve, a 16-6# control valve, a 17-flue gas component detector and an 18-fuel gas component detector.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b): compare FIG. 1
A control system of a flue gas circulation device of a garbage gasification furnace comprises a blast furnace gasification furnace 1, wherein an air inlet at the lower part of the blast furnace gasification furnace 1 is connected with an air blower 10 through a 1# control valve 11 pipeline, an air outlet at the upper part of the blast furnace gasification furnace 1 is connected with a cyclone separator 2 through a pipeline, and a solid outlet at the bottom of the cyclone separator 2 is connected with a side part feed inlet of the blast furnace gasification furnace 1 through a pipeline, so that the solid separated by the cyclone separator 2 is discharged into the blast furnace gasification furnace 1 again for combustion and vaporization; a gas outlet at the upper part of the cyclone separator 2 is connected with an inlet of a secondary combustion chamber 3 through a pipeline, an outlet of the secondary combustion chamber 3 is sequentially connected with a waste heat boiler 4 and a quenching tower 5 through pipelines, the quenching tower 5 is connected with a bag-type dust remover 6 through a pipeline, and a solid outlet at the bottom of the bag-type dust remover 6 is connected with an ash tank and is connected with a feed inlet at the side part of the blast furnace gasification furnace 1 through the ash tank; an air outlet at the upper part of the bag-type dust collector 6 is connected with an induced draft fan 7 through a pipeline, and the flue gas discharged from an air outlet of the induced draft fan 7 is sent to a tail gas treatment system; wherein, a blower for blowing air is connected on the second combustion chamber 3 through a pipeline.
Furthermore, the gas outlet at the upper part of the cyclone separator 2 is divided into two paths, one path is connected with the inlet of the second combustion chamber 3 through a pipeline, and the other path is connected with the gas inlet at the lower part of the blast furnace gasification furnace 1 through a 4# control valve 14, a circulating high-temperature fan 9 and a 3# control valve 13.
The blast furnace gasification furnace 1 is an unpressurized vertical ultra-high temperature hot gas gasification furnace, which utilizes biomass carbon to perform anoxic pyrolysis treatment on garbage, and the lower part of the blast furnace gasification furnace is provided with 3 annular air inlets.
In order to further reduce the generation of pollutants, ash generated by the bag-type dust collector 6 can be conveyed to the blast furnace gasification furnace through a pipeline for gasification, and reduction treatment is carried out.
Further, the apparatus of the present application further includes a circulation blower 8; the gas outlet of the induced draft fan 7 is divided into two paths, one path is connected with the tail gas treatment system through a pipeline, the other path is connected with the inlet of the circulating air feeder 8 through a 6# control valve 16 through a pipeline, the outlet of the circulating air feeder 8 is connected with the second combustion chamber 3 through a 5# control valve 15 through a pipeline, and a flue gas circulating system is formed.
Further, the gas outlet of the induced draft fan 7 is provided with a gas outlet for detecting NO in the flue gasXThe smoke component detector 17 is used for detecting smoke components with component content, and the smoke component detector 17 is in signal connection with the No. 5 control valve 15 through a PLC control system; when the smoke component detector 17 detects NO in the smoke discharged by the induced draft fan 7XWhen the component content is higher or lower, the opening degree of the 5# control valve 15 is controlled to be increased or decreased through the feedback control of the PLC control system, the smoke discharged by the induced draft fan 7 is divided into one path and sent into the secondary combustion chamber 3 through the circulating air feeder 8, partial internal circulation of the smoke is carried out, and the NO generated by combustion in the secondary combustion chamber 3 is reducedXAmount of the compound (A).
Further, the air outlet of the circulating air feeder 8 is divided into two paths, and one path is connected with the second combustion chamber 3 through a No. 5 control valve 15 by a pipeline to form a flue gas circulating system; the other path is connected with the air inlet at the lower part of the blast furnace gasification furnace 1 through a No. 2 control valve 12 by a pipeline, so that the flue gas discharged by the circulating blower 8 is divided into one path and is introduced into the blast furnace gasification furnace 1 to be used as a gasification agent.
Referring to fig. 1, a pipeline between the gas outlet at the upper part of the cyclone separator 2 and the inlet of the second combustion chamber 3 is also provided with a device for detecting CO in the fuel gas2Water vapor and O2The gas component detector 18 is connected with the 4# control valve 14, the circulating high-temperature fan 9 and the 3# control valve 13 through signals of a PLC control system; when the gas component detector 18 detects CO in the gas discharged from the cyclone separator 22Or steamWhen the component content is higher, the circulating high-temperature fan 9 is started through feedback control of the PLC control system, the 4# control valve 14 and the 3# control valve 13 are opened, the fuel gas discharged by the cyclone separator 2 is divided into one path and is sent into the blast furnace gasification furnace 1 through the circulating high-temperature fan 9, partial internal circulation of the fuel gas is carried out, the quality of the fuel gas is further improved, and the possibility of generating dioxin is further reduced. When CO is contained in the fuel gas2And a low water vapor content, the high temperature recycle blower 9, the control valve # 4 14, and the control valve # 3 13 may be re-turned off.
The gas component detector 18 is in signal connection with the No. 1 control valve 11, the blower 10 and the No. 2 control valve 12 through a PLC control system, and when the gas component detector 18 detects O in the gas discharged by the cyclone separator 22When the component content is higher, the PLC control system controls the air blower 10 and the No. 1 control valve 11 to be turned off in a feedback mode, the No. 2 control valve 12 is opened, one path of tail flue gas discharged by the draught fan 7 is used as a gasifying agent of the blast furnace gasification furnace 1, the fuel gas quality is improved, and dioxin in the flue gas is degraded. In gas O2When the content of the component is low, the opening of the blower 10 and the 1# control valve 11 can be returned to normal, and the 2# control valve 12 is closed.
The application discloses rubbish gasification stove gas recirculation device control system has and reduces dioxin and reduces NOXGenerating and improving the quality of the fuel gas and the like.
The device divides the flue gas exhausted by the draught fan into one path and sends the one path into the secondary combustion chamber to perform partial internal circulation of the flue gas so as to reduce NO generated by combustion in the secondary combustion chamberXAn amount; one path of the waste enters a gasification furnace to be used as a gasification agent for gasifying the waste; and one path of the fuel gas discharged by the cyclone separator is separated and sent into a blast furnace gasification furnace for partial internal circulation of the fuel gas, so that dioxin existing in gasification is degraded, the quality of the fuel gas is further improved, and the rest of the fuel gas enters a secondary combustion chamber for incineration and utilization of heat value.
When the control system of the flue gas circulation device of the garbage gasification furnace works, garbage is firstly put into the blast furnace gasification furnace to be subjected to anoxic pyrolysis treatment to generate a flue gas containing CO and H2The fuel gas with equal components is introduced into a secondary chamber to be combusted at the temperature of 800-900 ℃ to generate CO2High temperature flue gas containing water vapor and the like. After part of heat of the high-temperature flue gas is recovered by the waste heat boiler, the high-temperature flue gas is cooled to below 200 ℃ by the quench tower and then is subjected to dust removal treatment by the bag-type dust remover.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.

Claims (5)

1. A control system of a flue gas circulation device of a garbage gasification furnace is characterized by comprising a blast furnace gasification furnace (1), wherein an air inlet at the lower part of the blast furnace gasification furnace (1) is connected with an air blower (10) through a 1# control valve (11) pipeline, an air outlet at the upper part of the blast furnace gasification furnace (1) is connected with a cyclone separator (2) through a pipeline, and a solid outlet at the bottom of the cyclone separator (2) is connected with a side feed inlet of the blast furnace gasification furnace (1) through a pipeline so as to discharge the solid separated by the cyclone separator (2) into the blast furnace gasification furnace (1) again for combustion; a gas outlet at the upper part of the cyclone separator (2) is connected with an inlet of a second combustion chamber (3) through a pipeline, an outlet of the second combustion chamber (3) is sequentially connected with a waste heat boiler (4) and a quenching tower (5) through pipelines, the quenching tower (5) is connected with a bag-type dust remover (6) through a pipeline, and a solid outlet at the bottom of the bag-type dust remover (6) is connected with an ash tank and is connected with a feed inlet at the side part of the blast furnace gasification furnace (1) through the ash tank; an air outlet at the upper part of the bag-type dust collector (6) is connected with an induced draft fan (7) by a pipeline, and flue gas discharged from an air outlet of the induced draft fan (7) is sent to a tail gas treatment system; wherein, the second combustion chamber (3) is also connected with a blower for blowing air through a pipeline.
2. The flue gas circulation device control system of a refuse gasification furnace according to claim 1, further comprising a circulation blower (8); the gas outlet of the induced draft fan (7) is divided into two paths, one path is connected with the tail gas treatment system through a pipeline, the other path is connected with the inlet of the circulating air feeder (8) through a No. 6 control valve (16) through a pipeline, the outlet of the circulating air feeder (8) is connected with the secondary combustion chamber (3) through a No. 5 control valve (15) through a pipeline, and a flue gas circulation system is formed.
3. The waste gasification furnace flue gas circulation device control system according to claim 2, wherein the air outlet of the induced draft fan (7) is provided with a device for detecting NO in flue gasXThe smoke component detector (17) is used for detecting the content of components, and the smoke component detector (17) is in signal connection with the No. 5 control valve (15) through a PLC control system; when the smoke component detector (17) detects NO in the smoke discharged by the induced draft fan (7)XWhen the component content is higher or lower, the opening degree of a No. 5 control valve (15) is controlled to be increased or decreased through the feedback of a PLC control system, the smoke discharged by a draught fan (7) is divided into one path and sent into a secondary combustion chamber (3) through a circulating air feeder (8), and partial internal circulation of the smoke is carried out so as to reduce NO generated by combustion in the secondary combustion chamber (3)XAmount of the compound (A).
4. The flue gas circulation device control system of the garbage gasification furnace according to claim 2, wherein the air outlet of the circulation blower (8) is divided into two paths, one path is connected with the second combustion chamber (3) through a No. 5 control valve (15) by a pipeline to form a flue gas circulation system; the other path is connected with the air inlet at the lower part of the blast furnace gasification furnace (1) through a No. 2 control valve (12) by a pipeline, so that the flue gas discharged by the circulating blower (8) is divided into one path and is introduced into the blast furnace gasification furnace (1) to be used as a gasification agent;
the gas outlet at the upper part of the cyclone separator (2) is divided into two paths, one path is connected with the inlet of the second combustion chamber (3) through a pipeline, and the other path is connected with the gas inlet at the lower part of the blast furnace gasification furnace (1) through a No. 4 control valve (14), a circulating high-temperature fan (9) and a No. 3 control valve (13) through a pipeline.
5. The control system of the flue gas circulation device of the garbage gasification furnace according to claim 4, wherein a pipeline between the gas outlet at the upper part of the cyclone separator (2) and the inlet of the secondary combustion chamber (3) is further provided with a device for detecting CO in the fuel gas2Water vapor and O2A gas component detector (18) for content, the gas component detector (18)The PLC control system is in signal connection with a 4# control valve (14), a circulating high-temperature fan (9) and a 3# control valve (13); when the gas component detector (18) detects CO in the gas discharged by the cyclone separator (2)2Or when the content of the steam component is higher, the circulating high-temperature fan (9) is started through the feedback control of the PLC control system, the 4# control valve (14) and the 3# control valve (13) are opened, the fuel gas discharged by the cyclone separator (2) is divided into one path and is sent into the blast furnace gasification furnace (1) through the circulating high-temperature fan (9), and partial internal circulation of the fuel gas is carried out;
the gas composition detector (18) is in signal connection with the No. 1 control valve (11), the air blower (10) and the No. 2 control valve (12) through a PLC control system, and when the gas composition detector (18) detects O in gas discharged by the cyclone separator (2)2When the component content is higher, the PLC control system controls the air blower (10) and the 1# control valve (11) to be turned off in a feedback mode, and the 2# control valve (12) is turned on.
CN202021763636.9U 2020-08-21 2020-08-21 Garbage gasification stove flue gas circulating device control system Active CN213327474U (en)

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