CN107653006B - Pulverized coal gasification device and process for producing high-calorific-value coal gas and low-carbon residue - Google Patents
Pulverized coal gasification device and process for producing high-calorific-value coal gas and low-carbon residue Download PDFInfo
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- CN107653006B CN107653006B CN201711041111.7A CN201711041111A CN107653006B CN 107653006 B CN107653006 B CN 107653006B CN 201711041111 A CN201711041111 A CN 201711041111A CN 107653006 B CN107653006 B CN 107653006B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/721—Multistage gasification, e.g. plural parallel or serial gasification stages
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/74—Construction of shells or jackets
- C10J3/76—Water jackets; Steam boiler-jackets
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/15—Details of feeding means
- C10J2200/152—Nozzles or lances for introducing gas, liquids or suspensions
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
- C10J2300/0936—Coal fines for producing producer gas
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0956—Air or oxygen enriched air
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
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- C10J2300/0976—Water as steam
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- C10J2300/00—Details of gasification processes
- C10J2300/12—Heating the gasifier
- C10J2300/123—Heating the gasifier by electromagnetic waves, e.g. microwaves
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- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
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Abstract
The invention discloses a pulverized coal gasification device and a pulverized coal gasification process for producing high-calorific-value coal gas with low carbon residue. The device comprises a U-shaped gas producer and a gas separation device, wherein the U-shaped gas producer consists of a high-temperature section and a low-temperature section which are arranged in a U shape; the high temperature section and the low temperature Duan Gongyong are an ash bucket; the high temperature section is a downlink entrained flow bed, and the low temperature section is an uplink entrained flow bed; the inlet of the gas separation device is communicated with the outlet of the low-temperature section, the solid outlet of the gas separation device is communicated with the inlet of the high-temperature section, and the gas outlet of the gas separation device is connected with the gas waste heat utilization and purification system. The method can greatly improve the utilization rate of coal.
Description
Technical Field
The invention belongs to the technical field of coal chemical industry, and particularly relates to a coal dust gasification device and process for producing high-calorific-value coal gas with low carbon residue.
Background
The coal gasification technology is one of the clean and efficient utilization ways of coal, and is mainly used for producing city gas, chemical synthesis raw gas, fuel gas for combined cycle power generation and the like. In recent years, with the improvement of the environmental protection standard of the flue gas emission of industrial kilns in industries such as building materials, ceramics, glass and the like, the original coal-fired kiln is changed into fuel gas, the demand of industrial fuel gas is increased, and the natural gas resource shortage in China, and the production of industrial fuel gas by coal gasification becomes a necessary choice. At present, the domestic gas producer for producing industrial gas has the following two problems in application:
firstly, the calorific value of the produced gas is not high, and the main active ingredients of the gas produced by the existing low-pressure or normal-pressure coal gasification technology are CO and H 2 Low hydrocarbon content, N 2 High content, resulting in a gas heating valueAnd lower. In the main effective components of coal gas, CO and H 2 And CH (CH) 4 In CH 4 The volume heat value of the gas is the highest, so that in order to increase the heat value of the gas, the CH4 content in the gas is increased, and the invalid component N is reduced 2 And CO 2 The content is as follows.
Secondly, the fly ash carbon residue in the raw gas is high and difficult to use, the existing low-pressure or normal-pressure coal gasification technology is limited by technology and process, and the content of the fly ash carbon residue collected by gas purification is very high. Taking the circulating fluidized bed normal pressure gasification technology as an example, raw material particles are crushed in a gasification furnace to generate a large amount of fine particles, the fine particles are difficult to collect and recycle through a cyclone separator in the furnace once, the retention time is short, the generated fly ash amount accounts for 20-25% of the coal amount entering the furnace, the residual carbon content in the fly ash is up to 45-50%, and the fly ash residual carbon is difficult to be sent back to the fluidized bed gasification furnace for continuous gasification, so that the gasification efficiency is low, and the raw material utilization rate is low. The problem of high fly ash carbon residue in raw gas and difficult utilization can also occur by using other low-pressure or normal-pressure gasification processes.
Disclosure of Invention
In order to solve the defects in the prior art, the first object of the invention is to provide a pulverized coal gasification device for producing high-heat-value gas and low-carbon residue, which can produce high-heat-value gas or chemical synthesis gas according to requirements, and can fully utilize gasification carbon residue, and send unreacted gasification semicoke (carbon residue) and carbon residue-containing coal ash collected by gas purification back to a gas producer for gasification, so that the utilization rate of coal can be greatly improved.
The invention relates to a pulverized coal gasification device for producing high-heat-value coal gas and low carbon residue, which comprises a U-shaped coal gas producer and a coal gas separation device, wherein the U-shaped coal gas producer consists of a high-temperature section and a low-temperature section which are arranged in a U shape; the high temperature section and the low temperature Duan Gongyong are an ash bucket; the high temperature section is a downlink entrained flow bed, and the low temperature section is an uplink entrained flow bed; the inlet of the gas separation device is communicated with the outlet of the low-temperature section, the solid outlet of the gas separation device is communicated with the inlet of the high-temperature section, and the gas outlet of the gas separation device is connected with the gas waste heat utilization and purification system.
The low-temperature section of the invention can adopt the following two arrangement modes:
the first arrangement mode of the low-temperature section is as follows:
the low temperature section comprises a low temperature Duan Luti, the connection part of the low temperature Duan Luti and the high temperature section is a low temperature Duan Hou opening part, an oxygen/air nozzle is arranged at the lower end of the low temperature Duan Hou opening part, and a low temperature Duan Meifen nozzle is arranged at the upper end.
The second low-temperature section arrangement mode:
the low temperature section comprises a low temperature Duan Luti, the connection part of the low temperature Duan Luti and the high temperature section is a low temperature Duan Hou opening part, an oxygen/air nozzle is arranged at the lower end of the low temperature Duan Hou opening part, and a low temperature Duan Meifen nozzle is arranged at the low temperature Duan Hou opening part.
Further, a microwave reformer is further disposed on the low temperature Duan Luti.
The microwave reforming device is auxiliary equipment and can be selectively used according to requirements.
Further, the low-temperature Duan Meifen nozzle is of a single-channel structure.
Furthermore, the feeding mode of the low-temperature Duan Meifen nozzle adopts pneumatic conveying, and the conveying medium is nitrogen or hot flue gas; and the number of the low-temperature Duan Meifen nozzles is two, and the two nozzles are arranged in a hedging way.
Further, the feeding mode of the low-temperature Duan Meifen nozzle is in a chute mode.
Further, the high temperature section comprises a high temperature section furnace body, a water cooling wall is arranged on the outer side of the high temperature section furnace body, and a high temperature section coal powder nozzle is arranged on the high temperature section furnace body.
Furthermore, the high-temperature section pulverized coal nozzle is of a three-channel structure, wherein the three-channel structure is respectively provided with central feeding, pure oxygen is introduced into the outer layer, and water vapor is introduced into the outermost layer.
A second object of the present invention is to provide a pulverized coal gasification process based on a pulverized coal gasification device for producing high calorific value gas with low char yield.
The invention relates to a pulverized coal gasification process based on a pulverized coal gasification device for producing high-calorific-value coal gas and low-carbon residue, which comprises the following steps of:
step 1: raw materials are subjected to high-temperature section pure oxygen gasification to generate high-temperature coal gas, and the temperature is 1300-1600 ℃; wherein, the raw materials comprise semicoke, coal ash and raw coal powder which are fully gasified at low temperature Duan Weiwan;
step 2: the high-temperature coal gas generated in the step 1 enters a low-temperature section, is quenched and tempered by an air/oxygen nozzle, and is subjected to pyrolysis and gasification reaction with raw coal dust sprayed by the low-temperature Duan Meifen nozzle in the same uplink direction to obtain coal gas with high hydrocarbon substance content and semi-coke which is not completely gasified, wherein the gasification temperature of the air temperature section is 900-1100 ℃;
step 3: separating the coal gas obtained in the step 2 from semicoke, introducing the coal gas into a coal gas waste heat utilization and purification system, collecting the semicoke, and delivering the semicoke into a high-temperature section for high-temperature gasification; the coal ash collected by the gas waste heat utilization and purification system is also sent to a high temperature section for high temperature gasification.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the pulverized coal gasification device for producing high-heat-value gas and low carbon residue, the high-heat-value gas with relatively high hydrocarbon content can be obtained through two-stage gasification of the high-temperature section and the low-temperature section, the raw materials undergo gasification reaction in the high-temperature section to obtain the high-temperature gas, after entering the low-temperature section, the new pulverized coal is added to undergo pyrolysis reaction by means of heat of the high-temperature gas, and meanwhile, in-phase gasification and out-phase gasification reactions are carried out, so that the high-heat-value gas with relatively high hydrocarbon content and unreacted semicoke are finally obtained; wherein, unreacted semicoke is directly sent into a high temperature section for high temperature gasification.
(2) The invention can fully utilize the residual carbon after coal gasification, improve the carbon conversion rate, and the raw coal gas separated by the coal gas separation device is directly sent into a high-temperature section for high-temperature gasification through the coal ash collected by waste heat utilization and dust removal purification, thereby realizing the utilization of the residual carbon and further improving the carbon conversion rate.
(3) According to the invention, the microwave reforming device is arranged at the low-temperature section, the tar content can be reduced under the action of microwaves, and the gas component is adjusted to be synthesis gas according to the requirements of users on the gas component.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of an embodiment of a pulverized coal gasification device for producing high calorific value gas with low char yield according to the present invention;
FIG. 2 is a side view AA of an embodiment of the pulverized coal gasification unit for producing high calorific value gas with low char yield according to the present invention;
FIG. 3 is a schematic diagram of a second embodiment of the pulverized coal gasification device for producing high calorific value gas with low char yield according to the present invention;
fig. 4 is a flow chart of a pulverized coal gasification process of the pulverized coal gasification device based on high-calorific-value coal gas production and low-carbon residue.
Wherein, 1, coal dust; 2. coal ash; 3. oxygen; 4. water vapor; 5. a gasification nozzle; 6. water supply; 7. a high temperature section; 8. a water cooling wall; 9. water vapor; 10. an ash bucket; 11. ash residues; 12. an air/oxygen nozzle; 13. a low temperature Duan Meifen nozzle; 14. a low temperature section; 15. a microwave reformer; 16. a gas separation device; 17. semicoke; 18. and (3) gas.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1
FIG. 1 is a schematic diagram of an embodiment of a pulverized coal gasification device for producing high calorific value gas with low char yield according to the present invention.
As shown in fig. 1, the pulverized coal gasification device for producing high-heating-value gas with low carbon residue comprises a U-shaped gas producer and a gas separation device 16, wherein the U-shaped gas producer consists of a high-temperature section 14 and a low-temperature section 7 which are arranged in a U shape; the high temperature section 7 and the low temperature section 14 share an ash bucket 10; the high temperature section 7 is a downlink entrained flow bed, and the low temperature section 14 is an uplink entrained flow bed; the inlet of the gas separation device 16 is communicated with the outlet of the low-temperature section 14, the solid outlet of the gas separation device 16 is communicated with the inlet of the high-temperature section 7, and the gas outlet of the gas separation device 16 is connected with a gas waste heat utilization and purification system.
In this embodiment, the gas waste heat utilization and purification system can also be realized by the existing structure.
Specifically, firstly, coal dust 1, coal ash 2, oxygen 3 and water vapor 4, and semicoke 17 obtained by a gas separation device 16 all enter a high-temperature section 7 through a gasification nozzle 5, and corresponding water supply 6 is also carried out in the process of treatment of the high-temperature section 7. After the treatment of the high temperature section 7, steam 9 and ash 11 are obtained, and the ash 11 is output outwards from the ash bucket 10. Finally, the gas outlet of the gas separation device 16 outputs gas 18 outwards.
In this embodiment, the low temperature section 14 includes a low temperature Duan Luti, where the connection between the low temperature Duan Luti and the high temperature section 7 is a low temperature Duan Hou opening, the lower end of the opening of the low temperature Duan Hou is provided with an oxygen/air nozzle 12, and the upper end is provided with a low temperature Duan Meifen nozzle 13.
In this embodiment, a microwave reformer 15 is also provided at the low temperature Duan Luti for the purpose of reforming hydrocarbon materials.
The microwave reforming device is auxiliary equipment, can be used selectively according to requirements, and the specific structure of the microwave reforming device can be realized by adopting the existing structure.
In a specific implementation, the cryogenic Duan Meifen nozzle is a single channel structure.
The low temperature Duan Meifen nozzle 13 may be fed by any of the following methods:
mode one: the feeding mode of the low-temperature Duan Meifen nozzle 13 adopts pneumatic conveying, and the conveying medium is nitrogen or hot flue gas; and two of the low temperature Duan Meifen nozzles 13 are in a counter-flushing arrangement as shown in figure 2.
Mode two: the low temperature Duan Meifen nozzle 13 is fed in the form of a chute.
In a specific implementation, the high-temperature section 7 comprises a high-temperature section furnace body, a water cooling wall 8 is arranged on the outer side of the high-temperature section furnace body, and a high-temperature section coal powder nozzle is arranged on the high-temperature section furnace body.
In the implementation, the high-temperature section pulverized coal nozzle is of a three-channel structure, wherein the three-channel structure is respectively provided with a central feeding part, a pure oxygen layer and a water vapor layer.
The pulverized coal gasification device for producing high-heat-value gas and low carbon residue can obtain high-heat-value gas with relatively high hydrocarbon content through two-stage gasification of a high-temperature stage and a low-temperature stage, raw materials undergo gasification reaction in the high-temperature stage to obtain high-temperature gas, after entering the low-temperature stage, newly added pulverized coal undergoes pyrolysis reaction by means of heat of the high-temperature gas, and simultaneously undergoes in-phase and out-phase gasification reactions to finally obtain high-heat-value gas with relatively high hydrocarbon content and unreacted semicoke; wherein, unreacted semicoke is directly sent into a high temperature section for high temperature gasification.
The embodiment can fully utilize the carbon residue after coal gasification, improve the carbon conversion rate, and the raw coal gas separated by the coal gas separation device is directly sent into a high-temperature section for high-temperature gasification through the coal ash collected by waste heat utilization and dust removal purification, thereby realizing the utilization of the carbon residue and further improving the carbon conversion rate.
In the embodiment, the microwave reforming device is arranged at the low-temperature section, the tar content can be reduced under the action of microwaves, and the gas component is adjusted to be synthesis gas according to the requirement of a user on the gas component.
Example two
FIG. 3 is a schematic diagram of a pulverized coal gasification device for producing high calorific value gas with low char yield according to an embodiment of the present invention.
As shown in fig. 3, the pulverized coal gasification device for producing high-heating-value gas with low carbon residue in the embodiment comprises a U-shaped gas producer and a gas separation device 16, wherein the U-shaped gas producer consists of a high-temperature section 7 and a low-temperature section 14 which are arranged in a U shape; the high temperature section 7 and the low temperature section 14 share an ash bucket 10; the high temperature section 7 is a downlink entrained flow bed, and the low temperature section 14 is an uplink entrained flow bed; the inlet of the gas separation device 16 is communicated with the outlet of the low-temperature section 7, the solid outlet of the gas separation device 16 is communicated with the inlet of the high-temperature section 7, and the gas outlet of the gas separation device 16 is connected with a gas waste heat utilization and purification system.
In this embodiment, the gas waste heat utilization and purification system can also be realized by the existing structure.
Specifically, firstly, coal dust 1, coal ash 2, oxygen 3 and water vapor 4, and semicoke 17 obtained by a gas separation device 16 all enter a high-temperature section 7 through a gasification nozzle 5, and corresponding water supply 6 is also carried out in the process of treatment of the high-temperature section 7. After the treatment of the high temperature section 7, steam 9 and ash 11 are obtained, and the ash 11 is output outwards from the ash bucket 10. Finally, the gas outlet of the gas separation device 16 outputs gas 18 outwards.
In this embodiment, the high temperature section 7 includes a high temperature section furnace body, the junction of the high temperature section furnace body and the low temperature section 14 is a low temperature Duan Hou opening, the lower end of the low temperature Duan Hou opening is provided with an oxygen/air nozzle 12, and the low temperature Duan Hou opening is provided with a low temperature Duan Meifen nozzle 13.
In this embodiment, a microwave reformer 15 is also provided at the low temperature Duan Luti for the purpose of reforming hydrocarbon materials.
The microwave reforming device is auxiliary equipment, can be used selectively according to requirements, and the specific structure of the microwave reforming device can be realized by adopting the existing structure.
In a specific implementation, the cryogenic Duan Meifen nozzle is a single channel structure.
The low temperature Duan Meifen nozzle 13 may be fed by any of the following methods:
mode one: the feeding mode of the low-temperature Duan Meifen nozzle 13 adopts pneumatic conveying, and the conveying medium is nitrogen or hot flue gas; and two of the low temperature Duan Meifen nozzles 13 are in a counter-flushing arrangement as shown in figure 2.
Mode two: the low temperature Duan Meifen nozzle 13 is fed in the form of a chute.
In a specific implementation, the high-temperature section 7 comprises a high-temperature section furnace body, a water cooling wall 8 is arranged on the outer side of the high-temperature section furnace body, and a high-temperature section coal powder nozzle is arranged on the high-temperature section furnace body.
In the implementation, the high-temperature section pulverized coal nozzle is of a three-channel structure, wherein the three-channel structure is respectively provided with a central feeding part, a pure oxygen layer and a water vapor layer.
The pulverized coal gasification device for producing high-heat-value gas and low carbon residue can obtain high-heat-value gas with relatively high hydrocarbon content through two-stage gasification of a high-temperature stage and a low-temperature stage, raw materials undergo gasification reaction in the high-temperature stage to obtain high-temperature gas, after entering the low-temperature stage, newly added pulverized coal undergoes pyrolysis reaction by means of heat of the high-temperature gas, and simultaneously undergoes in-phase and out-phase gasification reactions to finally obtain high-heat-value gas with relatively high hydrocarbon content and unreacted semicoke; wherein, unreacted semicoke is directly sent into a high temperature section for high temperature gasification.
The embodiment can fully utilize the carbon residue after coal gasification, improve the carbon conversion rate, and the raw coal gas separated by the coal gas separation device is directly sent into a high-temperature section for high-temperature gasification through the coal ash collected by waste heat utilization and dust removal purification, thereby realizing the utilization of the carbon residue and further improving the carbon conversion rate.
In the embodiment, the microwave reforming device is arranged at the low-temperature section, the tar content can be reduced under the action of microwaves, and the gas component is adjusted to be synthesis gas according to the requirement of a user on the gas component.
The invention also provides a pulverized coal gasification process based on the pulverized coal gasification device for producing high-heat-value coal gas and low in carbon residue.
Fig. 4 is a flow chart of a pulverized coal gasification process of the pulverized coal gasification device based on high-calorific-value coal gas production and low-carbon residue.
As shown in fig. 4, a pulverized coal gasification process based on a pulverized coal gasification device for producing high heating value gas with low carbon residue of the present invention comprises:
step 1: raw materials are subjected to high-temperature section pure oxygen gasification to generate high-temperature coal gas, and the temperature is 1300-1600 ℃; wherein, the raw materials comprise semicoke, coal ash and raw coal powder which are fully gasified at low temperature Duan Weiwan;
step 2: the high-temperature coal gas generated in the step 1 enters a low-temperature section, is quenched and tempered by an air/oxygen nozzle, and is subjected to pyrolysis and gasification reaction with raw coal dust sprayed by the low-temperature Duan Meifen nozzle in the same uplink direction to obtain coal gas with high hydrocarbon substance content and semi-coke which is not completely gasified, wherein the gasification temperature of the air temperature section is 900-1100 ℃;
step 3: separating the coal gas obtained in the step 2 from semicoke, introducing the coal gas into a coal gas waste heat utilization and purification system, collecting the semicoke, and delivering the semicoke into a high-temperature section for high-temperature gasification; the coal ash collected by the gas waste heat utilization and purification system is also sent to a high temperature section for high temperature gasification.
In the implementation, the microwave reformer at the upper part of the low-temperature section can crack tar in the gas and reform hydrocarbon into synthesis gas, the tar content of the gas can be reduced under the action of microwaves, and the gas component is adjusted to be synthesis gas according to the requirement of a user on the gas component.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (7)
1. The pulverized coal gasification device for producing high-heat-value coal gas and low carbon residue is characterized by comprising a U-shaped coal gas producer and a coal gas separation device, wherein the U-shaped coal gas producer consists of a high-temperature section and a low-temperature section which are arranged in a U shape; the high temperature section and the low temperature Duan Gongyong are an ash bucket; the high temperature section is a downlink entrained flow bed, and the low temperature section is an uplink entrained flow bed; the inlet of the gas separation device is communicated with the outlet of the low-temperature section, the solid outlet of the gas separation device is communicated with the inlet of the high-temperature section, and the gas outlet of the gas separation device is connected with the gas waste heat utilization and purification system; the low temperature section comprises a low temperature Duan Luti, the joint of the low temperature Duan Luti and the high temperature section is a low temperature Duan Hou opening, an oxygen air nozzle is arranged at the lower end of the low temperature Duan Hou opening, and a low temperature Duan Meifen nozzle is arranged at the upper end of the low temperature Duan Hou opening; or a low temperature Duan Meifen nozzle is arranged at the mouth of the low temperature Duan Hou;
the high-temperature section comprises a high-temperature section furnace body, a water cooling wall is arranged on the outer side of the high-temperature section furnace body, and a high-temperature section coal powder nozzle is arranged on the high-temperature section furnace body.
2. The pulverized coal gasification device for producing high heating value gas and low carbon residue as claimed in claim 1, wherein a microwave reforming device is further provided on the low temperature Duan Luti.
3. The pulverized coal gasification device for producing high-calorific-value gas and low-carbon residue according to claim 1, wherein the low-temperature Duan Meifen nozzle has a single-channel structure.
4. The pulverized coal gasification device for producing high-calorific-value gas and low-carbon residue according to claim 1, wherein the feeding mode of the low-temperature Duan Meifen nozzle adopts pneumatic conveying, and the conveying medium is nitrogen or hot flue gas; and the number of the low-temperature Duan Meifen nozzles is two, and the two nozzles are arranged in a hedging way.
5. The pulverized coal gasification device for producing high-calorific-value gas and low-carbon residue according to claim 1, wherein the feeding mode of the low-temperature Duan Meifen nozzle is a chute mode.
6. The pulverized coal gasification device for producing high-calorific-value gas and low-carbon residue according to claim 1, wherein the high-temperature pulverized coal nozzle has a three-channel structure, and the three-channel structure is respectively a central feeding, pure oxygen passing through an outer layer and water vapor passing through an outermost layer.
7. A pulverized coal gasification process based on the pulverized coal gasification device for producing high heating value gas and low carbon residue according to any one of claims 1 to 6, characterized by comprising:
step 1: raw materials are subjected to high-temperature section pure oxygen gasification to generate high-temperature coal gas, and the temperature is 1300-1600 ℃; wherein, the raw materials comprise semicoke, coal ash and raw coal powder which are fully gasified at low temperature Duan Weiwan;
step 2: the high-temperature coal gas generated in the step 1 enters a low-temperature section, is quenched and tempered by an air/oxygen nozzle, and is subjected to pyrolysis and gasification reaction with raw coal dust sprayed by the low-temperature Duan Meifen nozzle in the same uplink direction to obtain coal gas with high hydrocarbon substance content and semi-coke which is not completely gasified, wherein the gasification temperature of the air temperature section is 900-1100 ℃;
step 3: separating the coal gas obtained in the step 2 from semicoke, introducing the coal gas into a coal gas waste heat utilization and purification system, collecting the semicoke, and delivering the semicoke into a high-temperature section for high-temperature gasification; the coal ash collected by the gas waste heat utilization and purification system is also sent to a high temperature section for high temperature gasification.
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| CN201711041111.7A CN107653006B (en) | 2017-10-30 | 2017-10-30 | Pulverized coal gasification device and process for producing high-calorific-value coal gas and low-carbon residue |
| PCT/CN2018/098663 WO2019029458A1 (en) | 2017-08-08 | 2018-08-03 | Pulverized coal gasification device and process for producing high calorific value gas with low residual carbon amount |
| US16/466,810 US11220642B2 (en) | 2017-08-08 | 2018-08-03 | Pulverized coal gasification device and process for producing high heating value coal gas with low carbon residue content |
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| CN108998098B (en) * | 2018-07-19 | 2020-11-10 | 山东大学 | Coal gasification process and device for liquid slag discharge and high-temperature coke return |
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