CN113072967A - Poly-generation process for coupling coal and biomass pyrolysis - Google Patents
Poly-generation process for coupling coal and biomass pyrolysis Download PDFInfo
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- CN113072967A CN113072967A CN202110497197.4A CN202110497197A CN113072967A CN 113072967 A CN113072967 A CN 113072967A CN 202110497197 A CN202110497197 A CN 202110497197A CN 113072967 A CN113072967 A CN 113072967A
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- 239000002028 Biomass Substances 0.000 title claims abstract description 104
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 27
- 230000008878 coupling Effects 0.000 title claims abstract description 12
- 238000010168 coupling process Methods 0.000 title claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 12
- 239000003245 coal Substances 0.000 title claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- 239000007789 gas Substances 0.000 claims description 26
- 238000002485 combustion reaction Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000003610 charcoal Substances 0.000 description 10
- 238000002309 gasification Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000021168 barbecue Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A coal-fired coupling biomass pyrolysis poly-generation process belongs to the technical field of biomass energy utilization, realizes the purpose of further improving the biomass energy utilization rate, and comprises the steps of utilizing high-temperature flue gas led out from an inlet of a tail flue of a circulating fluidized bed boiler to carry out anaerobic pyrolysis on biomass after the temperature is adjusted; the invention is used for biomass energy utilization.
Description
Technical Field
The invention belongs to the technical field of biomass energy utilization, and particularly relates to a coal-fired coupling biomass pyrolysis poly-generation process.
Background
Biomass belongs to renewable energy, but the utilization rate of biomass energy is not high at present, and the current situation is as follows:
at present, biomass combustion power generation is a main mode for biomass energy utilization, but the biomass power plant is limited by biomass collection radius, so that the scale of the power plant is small, the function is single, heat supply and cogeneration units hardly obtain economic benefit, and meanwhile, a boiler for combusting biomass needs to be specially designed, so that the design and manufacturing cost of boiler equipment are relatively high, compared with a conventional coal-fired boiler, the problems of coking, pipe explosion and the like are more likely to occur, long-term stable operation is difficult to realize, and the boiler is generally required to be shut down for maintenance and repair in one quarter.
Moreover, the operation of the biomass boiler for direct combustion often has problems and is greatly influenced by the types and the quality of biomass, so that some large-scale power plants adopt a power generation mode of coupling biomass gasification with a coal-fired boiler, a process route is that the biomass is gasified by adopting a fluidized bed boiler, and the gasified pyrolysis gas is sent to the coal-fired boiler for combustion and power generation, although the process can effectively avoid the phenomena of coking, tube explosion and the like of the heating surface of the boiler caused by the direct combustion and power generation of the biomass, the boiler can not be influenced by the long-term stable operation, the quality of carbon products after the biomass gasification is low and difficult to reuse, the overall utilization rate of the biomass energy is low, the high-efficiency resource utilization of the biomass energy cannot be realized, and the coal-fired boiler coupling biomass gasification power generation process in the mode.
In order to realize resource utilization of biomass energy, scientific research institutions have demonstrated biomass gasification or pyrolysis poly-generation processes on a small scale, biomass incompletely combusted is adopted in the biomass gasification process, the biomass is partially combusted to provide heat to realize the gasification process, biomass oil, charcoal and gas produced in the form have relatively poor quality, and biomass pyrolysis is carried out in a thermal cracking reaction under the condition of high temperature and oxygen insulation, so that the quality of the oil, charcoal and gas produced by biomass pyrolysis is relatively high, but generally produced gas is basically used for maintaining the heat required by biomass pyrolysis. In the two processes, for example, poly-generation power generation, an internal combustion engine generator set or a small gas-steam combined cycle unit needs to be invested, the overall investment is relatively high, economic benefit is difficult to obtain under the condition of no proper application scene, and the internal combustion engine or a gas turbine cannot stably operate for a long time due to tar contained in biomass gasified gas, and in order to obtain the quality of the gasified gas meeting the operation of the internal combustion engine, a gas purification system needs to be added, so that not only the investment is high, but also the treatment of the generated wastewater is still difficult to solve. In order to avoid the problems, a small gas boiler is matched with a steam generator set, but the scheme is complex and has larger investment. In conclusion, no matter the biomass gasification or pyrolysis process is matched with an internal combustion engine, a gas turbine or a steam combined cycle at present, the biomass gasification or pyrolysis process is not competitive with the direct combustion of biomass, so that the biomass gasification and pyrolysis poly-generation process cannot be popularized commercially on a large scale.
The scheme is developed in order to achieve a further increase in the utilization of the biomass energy.
Disclosure of Invention
The invention aims to realize the purpose of further improving the utilization rate of biomass energy, and provides a coal-fired coupled biomass pyrolysis poly-generation process, which adopts the following technical scheme:
a poly-generation process for coupling coal with biomass pyrolysis comprises the step of carrying out anaerobic pyrolysis on biomass by utilizing high-temperature flue gas led out from an inlet of a tail flue of a circulating fluidized bed boiler after the temperature is adjusted.
The invention has the beneficial effects that: biomass anaerobic pyrolysis can be realized without independently arranging a combustion heat supply system of an anaerobic pyrolysis device, the pyrolysis temperature is convenient to adjust, intelligent control is easy to realize, the quality of pyrolysis products is high, and accurate regulation and control can be realized in a certain range; because a combustion system is not required to be independently arranged for pyrolysis of biomass, the system has higher safety, pyrolysis products can be sent into a hearth to participate in combustion, more suitable application scenes exist, the system has good economical efficiency, coking or tube explosion of a heated surface of a boiler caused by direct combustion of the biomass is avoided, and the boiler does not need to be transformed; the water, gas, electricity and flue gas treatment systems required by anaerobic pyrolysis can utilize a public system of a power plant, and do not need to be additionally arranged, the investment of the whole system is far lower than that of a biomass pyrolysis poly-generation system which is independently constructed, the resource utilization of biomass is facilitated, and the economic benefit is greatly improved; particularly, during the peak regulation of a power plant, partial heat of the flue gas in the tail flue of the boiler is subjected to biomass pyrolysis poly-generation according to the peak regulation depth, so that the heat absorption capacity of the heating surface in the tail flue is reduced, the phenomenon of overheating and overtemperature of the heating surface in the boiler is effectively prevented, economic benefits are obtained by selling biomass pyrolysis carbon, oil and gas, the purpose of carbon emission reduction is achieved, the deep resource utilization of biomass is realized, and better economic benefits are obtained; the poly-generation process of the coal-fired coupled biomass pyrolysis is simple and reliable, the system occupies small area, is convenient for field arrangement and installation, and can be installed in a single set in a large scale and multiple sets in a small scale; the process can also be applied to the pyrolysis of household garbage, waste tires and oil sludge in oil fields.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of the present invention.
The specific implementation mode is as follows:
referring to fig. 1, a coal-fired coupled biomass pyrolysis poly-generation process comprises the anaerobic pyrolysis of biomass by using high-temperature flue gas led out from an inlet of a tail flue 2 of a circulating fluidized bed boiler 1 after adjusting the temperature.
A coal-fired coupled biomass pyrolysis poly-generation process comprises the steps of feeding fuel coal into a hearth of a circulating fluidized bed boiler 1 from a coal feeding port to participate in combustion, and feeding oil and gas generated by biomass pyrolysis into the hearth of the circulating fluidized bed boiler 1 from an oil feeding port and a gas feeding port to participate in combustion; the gas-solid separation is carried out on the flue gas discharged from the flue gas outlet of the circulating fluidized bed boiler 1 through the cyclone separator 3, and the separated solid particles are also sent into the hearth of the circulating fluidized bed boiler 1 to participate in combustion; one part of the separated high-temperature flue gas is sequentially cooled by a superheater 2-1, a reheater 2-2, an economizer 2-3 and an air preheater 2-4 arranged in the tail flue 2, and then is discharged to the atmosphere after dust removal; air required by combustion is input from an air chamber and a secondary air port of the circulating fluidized bed boiler 1; the other part of the separated high-temperature flue gas is led out from an inlet of a tail flue 2 of the circulating fluidized bed boiler 1, the temperature of the flue gas is about 700 ℃, the high-temperature flue gas is suitable for pyrolyzing biomass, and the lead-out amount of the flue gas is controlled by a valve according to the peak regulation depth; the ash particles in the flue gas are removed by the cyclone dust collector 4 after being led out, the abrasion to downstream equipment is reduced, the ash particles can be harmlessly treated according to the prior art, and the existing power plant has the equipment for treating the ash particles without being additionally arranged; the high-temperature flue gas with ash particles removed is sent into a flue gas and air mixing device 5 to adjust the temperature, the flue gas with the temperature of about 700 ℃ can easily control the cold air quantity through the existing temperature control technology to adjust the optimal temperature required by biomass pyrolysis, so that the accurate control and intelligent control on the proportion and the quality of biomass pyrolysis products are realized, and the flue gas and air mixing device 5 can be a static mixer, a mixing cavity and the like; the cold air source can be shared with the primary air or the secondary air of the circulating fluidized bed boiler 1 without being additionally arranged; the flue gas with the temperature adjusted by the flue gas and air mixing device 5 is used for being sent into the biomass anaerobic pyrolysis device 6 to heat the biomass, so that the biomass is fully pyrolyzed, the biomass raw material is pretreated according to the prior art and then is sent into the biomass anaerobic pyrolysis device 6, the biomass is pyrolyzed to generate oil, charcoal and gas, the biomass charcoal generated by biomass pyrolysis enters the biomass charcoal storage tank 6-1, the biomass charcoal can be directly sold to the market, and can also be processed into active charcoal, machine-made barbecue charcoal or charcoal-based fertilizer for sale, and further the economic benefit of the biomass charcoal is improved; oil and gas generated by biomass pyrolysis are condensed by an oil-gas condensing device 7, the condensed biomass oil is input into an oil storage tank 7-1 and can be sold to an oil refinery or sent into a hearth to participate in combustion, the condensed and separated biomass pyrolysis gas is input into a biomass pyrolysis gas pressure stabilizing tank 8 and can be used as domestic gas of nearby residents or industrial gas of nearby enterprises or sent into the hearth to participate in combustion according to the peak regulation depth, and a water source required by condensation is supplied by a cooling water system of a power plant without being additionally arranged; the flue gas after heating the biomass is sent back to the tail flue 2 of the circulating fluidized bed boiler 1, and is subjected to harmless treatment by denitration, desulfurization and dust removal equipment of the boiler without being additionally arranged.
Preferably, the flue gas with the temperature adjusted by the flue gas and air mixing device 5 is sent to a biomass anaerobic pyrolysis device 6 to heat the biomass, the flue gas with the biomass heated is sent to a biomass preheating device 9 to pretreat the biomass raw material, and then is sent back to the tail flue 2 of the circulating fluidized bed boiler 1; the proportion of the flue gas sent into the biomass preheating device 9 can be controlled by a valve according to the humidity of the biomass.
Preferably, the flue gas after heating the biomass is sent back to the tail flue 2 of the circulating fluidized bed boiler 1 from the front end of the air preheater 2-4, and the air is preheated by using the waste heat of the flue gas.
Claims (5)
1. A poly-generation process for coupling coal burning with biomass pyrolysis is characterized by comprising the step of carrying out anaerobic pyrolysis on biomass by utilizing high-temperature flue gas led out from an inlet of a tail flue (2) of a circulating fluidized bed boiler (1) after the temperature is adjusted.
2. The poly-generation process of coupling coal-fired biomass pyrolysis with the multi-generation process of claim 1, characterized by comprising feeding fuel coal into a furnace of the circulating fluidized bed boiler (1) from a coal feeding port to participate in combustion, and feeding oil and gas generated by biomass pyrolysis into the furnace of the circulating fluidized bed boiler (1) from the coal feeding port and the gas feeding port to participate in combustion; the gas-solid separation is carried out on the flue gas discharged from the flue gas outlet of the circulating fluidized bed boiler (1) through the cyclone separator (3), and the separated solid particles are also sent into the hearth of the circulating fluidized bed boiler (1) to participate in combustion; one part of the separated high-temperature flue gas is sequentially cooled by a superheater (2-1), a reheater (2-2), an economizer (2-3) and an air preheater (2-4) arranged in a tail flue (2), and is discharged to the atmosphere after dust removal; the other part of separated high-temperature flue gas is led out from an inlet of a tail flue (2) of the circulating fluidized bed boiler (1), ash particles in the flue gas are removed through a cyclone dust collector (4) after the high-temperature flue gas is led out, the high-temperature flue gas with the ash particles removed is sent into a flue gas and air mixing device (5) to be adjusted in temperature, and the flue gas with the temperature adjusted through the flue gas and air mixing device (5) is used for being sent into a biomass anaerobic pyrolysis device (6) to heat the biomass, so that the biomass is fully pyrolyzed.
3. The poly-generation process for coupling coal-fired biomass pyrolysis with the multi-generation technology as claimed in claim 1 or 2, characterized in that oil and gas generated by biomass pyrolysis are condensed by an oil-gas condensing device (7), the condensed biomass oil is sent to a hearth to participate in combustion, and the condensed and separated biomass pyrolysis gas is sent to the hearth to participate in combustion; and the flue gas after heating the biomass is sent back to a tail flue (2) of the circulating fluidized bed boiler (1).
4. The poly-generation process for coupling coal-fired biomass pyrolysis according to claim 2, characterized in that the flue gas whose temperature is adjusted by the flue gas mixing device (5) is sent to the biomass anaerobic pyrolysis device (6) to heat the biomass, and the flue gas after heating the biomass is sent to the biomass preheating device (9) to pretreat the biomass raw material and then sent back to the tail flue (2) of the circulating fluidized bed boiler (1).
5. The poly-generation process of coupling coal-fired biomass pyrolysis according to claim 2 or 4, characterized in that the flue gas after heating the biomass is returned to the tail flue (2) of the circulating fluidized bed boiler (1) from the front end of the air preheater (2-4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110497197.4A CN113072967A (en) | 2021-05-07 | 2021-05-07 | Poly-generation process for coupling coal and biomass pyrolysis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110497197.4A CN113072967A (en) | 2021-05-07 | 2021-05-07 | Poly-generation process for coupling coal and biomass pyrolysis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932216A (en) * | 2021-10-20 | 2022-01-14 | 北京航天迈未科技有限公司 | Carbon neutralization system based on pulverized coal boiler transformation and use method thereof |
| CN114788989A (en) * | 2022-04-25 | 2022-07-26 | 光大绿色环保管理（深圳）有限公司 | Equipment and method suitable for whole-plant flue gas purification of waste tire treatment |
| CN116251458A (en) * | 2023-02-22 | 2023-06-13 | 华南理工大学 | Denitration system and method for waste directional catalytic pyrolysis coupled staged combustion |
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| US6814940B1 (en) * | 1998-02-27 | 2004-11-09 | Fortum Oyj | Process for pyrolyzing carbonaceous feedstocks |
| CN101845314A (en) * | 2009-11-02 | 2010-09-29 | 郑州汇绿科技有限公司 | Novel pyrolytic system for producing bio-oil by forestry and agricultural residues |
| CN104088678A (en) * | 2014-05-13 | 2014-10-08 | 昆明理工大学 | Distributed biomass and organic Rankine cycle combined power generation carbon heat poly-generation system and method |
| CN107726306A (en) * | 2017-11-01 | 2018-02-23 | 山西大学 | A kind of clean coal clean combustion multi-production process system |
| WO2020154801A1 (en) * | 2019-01-28 | 2020-08-06 | Iq Energy Inc. | System and processes for upgrading synthetic gas produced from waste materials, municipal solid waste or biomass |
-
2021
- 2021-05-07 CN CN202110497197.4A patent/CN113072967A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6814940B1 (en) * | 1998-02-27 | 2004-11-09 | Fortum Oyj | Process for pyrolyzing carbonaceous feedstocks |
| CN101845314A (en) * | 2009-11-02 | 2010-09-29 | 郑州汇绿科技有限公司 | Novel pyrolytic system for producing bio-oil by forestry and agricultural residues |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932216A (en) * | 2021-10-20 | 2022-01-14 | 北京航天迈未科技有限公司 | Carbon neutralization system based on pulverized coal boiler transformation and use method thereof |
| CN114788989A (en) * | 2022-04-25 | 2022-07-26 | 光大绿色环保管理（深圳）有限公司 | Equipment and method suitable for whole-plant flue gas purification of waste tire treatment |
| CN116251458A (en) * | 2023-02-22 | 2023-06-13 | 华南理工大学 | Denitration system and method for waste directional catalytic pyrolysis coupled staged combustion |
| CN116251458B (en) * | 2023-02-22 | 2023-11-21 | 华南理工大学 | Denitration system and method for waste directional catalytic pyrolysis coupled staged combustion |
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Application publication date: 20210706 |