CN112175648A - Energy-saving system for preparing biomass oil by using waste heat of power plant ash - Google Patents
Energy-saving system for preparing biomass oil by using waste heat of power plant ash Download PDFInfo
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- CN112175648A CN112175648A CN202011190191.4A CN202011190191A CN112175648A CN 112175648 A CN112175648 A CN 112175648A CN 202011190191 A CN202011190191 A CN 202011190191A CN 112175648 A CN112175648 A CN 112175648A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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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
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1011—Biomass
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- 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
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- 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
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to an energy-saving system for preparing biomass oil by using waste heat of ash residues of a power plant, which comprises: the primary pyrolysis part is used for carrying out primary pyrolysis on the biomass raw material to generate primary biomass and preparing for secondary pyrolysis; and (3) secondary pyrolysis part: further pyrolyzing the primary biomass after the primary pyrolysis to generate biomass oil; and in the heat source part, the waste heat of ash slag is utilized to provide a heat source with a temperature grade required by pyrolysis for each stage of pyrolysis process. Compared with the prior art, the method utilizes the waste heat of the ash residue of the power plant to prepare the biomass oil, reduces the energy loss of the power plant, produces the biomass energy, improves the economy of the power plant, and can effectively utilize the waste heat of the power plant to achieve the effect of energy conservation.
Description
Technical Field
The invention relates to the technical field of biomass oil preparation, in particular to an energy-saving system for preparing biomass oil by using waste heat of ash residues of a power plant.
Background
With the increasingly severe energy and environment problems in China, the energy structure is greatly changed, and clean energy represented by wind, light and biomass and the like is more and more emphasized by the nation and the society. Especially, new energy represented by biomass energy is the key point of future energy development in China. The biomass oil produced by the pyrolysis of biomass energy has the potential to replace traditional fossil fuels.
The pyrolysis of biomass to produce biomass oil is accomplished primarily by primary and secondary pyrolysis of the biomass. The primary pyrolysis refers to a pyrolysis reaction of biomass at 200-300 ℃ under an anaerobic or anaerobic condition, and the biomass after the primary pyrolysis has higher quality and is more beneficial to the next-stage pyrolysis. The secondary pyrolysis refers to a process of pyrolyzing biomass at 500-600 ℃ under anaerobic or anaerobic conditions to generate biomass gas, and the generated biomass gas can be condensed into biomass oil through rapid cooling. In order to improve the quality and conversion efficiency of the biomass oil, the selection of a preparation mode is also extremely important, wherein the preparation of the biomass oil by catalytic pyrolysis is an important preparation mode, the preparation method has the advantages that the required equipment and operation cost are low, the pyrolysis quality is improved due to the participation of a catalyst, the temperature grade required by pyrolysis is reduced, and the mass production of the biomass oil combined with a traditional power plant is possible.
At present, the combination of biomass and a traditional power plant is not tight, but various losses in the traditional power plant are more, the temperature level is higher, and the temperature level requirement required by biomass pyrolysis can be completely met, ash residue thermophysical loss is one of the losses, although the proportion of the ash residue thermophysical loss is smaller in the current new fossil fuel power plant, the proportion of the ash residue thermophysical loss of most old power plants is larger, the ash residue temperature level is higher, if the ash residue waste heat can be effectively utilized, the energy loss can be effectively reduced by combining with biomass pyrolysis to prepare biomass oil phase, the energy-saving effect is achieved, and due to the combination with biomass energy, the economic efficiency of the power plant is improved, and meanwhile, the development trend of future energy in China can be better adapted. In the aspect of the utilization technology of the ash residue waste heat of the coal-fired power plant, the current common technical method comprises the technical means of utilizing the waste heat to heat boiler feed water so as to improve the heat efficiency; and a heat storage technology is utilized to store heat energy to supplement heat supply requirements, however, the waste heat utilization technology is generally the transfer of energy between heat energy and heat energy, the grade of the energy is not changed, and the stored heat cannot be stored for a long time. Therefore, based on the energy structure and the development focus of China at present, the energy-saving system which can be combined with the traditional power plant and can prepare the biomass oil by using the waste heat of the ash residue of the power plant is important to find.
Disclosure of Invention
The invention aims to provide an energy-saving system for preparing biomass oil by using the waste heat of ash residues of a power plant.
The purpose of the invention can be realized by the following technical scheme:
an energy-saving system for preparing biomass oil by using waste heat of ash residues of a power plant comprises:
the primary pyrolysis part is used for carrying out primary pyrolysis on the biomass raw material to generate primary biomass and preparing for secondary pyrolysis;
and (3) secondary pyrolysis part: further pyrolyzing the primary biomass after the primary pyrolysis to generate biomass oil;
and in the heat source part, the waste heat of ash slag is utilized to provide a heat source with a temperature grade required by pyrolysis for each stage of pyrolysis process.
The primary pyrolysis part comprises a biomass drying and grinding device for drying and grinding the biomass raw material and a primary pyrolysis device for performing primary pretreatment on the dried and ground biomass raw material by using ash residue waste heat as a heat source for primary pyrolysis.
The secondary pyrolysis part comprises a secondary pyrolysis device, a condensing device and a biomass oil collecting device, wherein the secondary pyrolysis device is used for performing high-temperature pyrolysis on primary biomass after primary pyrolysis is completed to generate required biomass gas, the condensing device is used for condensing the generated required biomass gas to form biomass oil, and the biomass oil collecting device is used for collecting the biomass oil generated after condensation. The secondary pyrolysis part also comprises a quick cooling pipeline for quickly condensing the biomass gas into the biomass oil, and the quick cooling pipeline penetrates through the condensing device.
The heat source part comprises a heat exchange pipeline used for circulating a high-temperature heat-carrying medium and transferring the waste heat of the ash slag of the power plant boiler to the secondary pyrolysis device, a pump used for providing power required by forced flow for the high-temperature heat-carrying medium and an ash slag pipeline used for carrying out non-contact type convection heat exchange on the high-temperature heat-carrying medium in the heat exchange pipeline.
The pump drives the high-temperature heat-carrying medium in the heat exchange pipeline to firstly enter the ash pipeline to absorb heat, the high-temperature heat-carrying medium which finishes heat absorption sequentially enters the secondary pyrolysis device and the primary pyrolysis device from large to small according to the temperature grade to release heat, and after heat release is finished, the high-temperature heat-carrying medium enters the ash pipeline again to absorb heat so as to circulate.
Further, the primary pyrolysis device comprises a heat exchange region and a pyrolysis region, heat can be transferred between the two regions, the biomass raw material is dried and ground by the biomass drying and grinding device, then enters the pyrolysis region in the primary pyrolysis device for primary pyrolysis, and high-temperature heat carrier flowing out of the secondary pyrolysis device releases heat in the heat exchange region in the primary pyrolysis device.
Furthermore, the secondary pyrolysis device comprises a heat exchange region and a pyrolysis region, heat can be transferred between the two regions, biomass raw materials subjected to primary pyrolysis in the primary pyrolysis device enter the pyrolysis region in the secondary pyrolysis device through a pipeline for pyrolysis, high-temperature biomass gas generated after pyrolysis enters the condensing device through a pipeline, the high-temperature biomass gas is condensed into biomass oil by using cooling water in the cooling water pipeline, and the biomass oil is collected and stored by using the biomass oil collecting device.
Further, when ash in the boiler of the power plant passes through the ash pipeline, a high-temperature heat-carrying medium in the heat exchange pipeline enters the ash pipeline under the driving of a pump to exchange heat with the high-temperature ash to absorb heat, and the high-temperature heat-carrying medium absorbing heat enters a heat exchange area in the secondary pyrolysis device to release heat so as to provide heat required by pyrolysis at the temperature level of 500-600 ℃ for a pyrolysis area in the secondary pyrolysis device.
The high-temperature heat-carrying medium which emits part of heat enters a heat exchange area in the primary pyrolysis device to emit heat, heat required by pyrolysis at the temperature of 200-300 ℃ is provided for the pyrolysis area in the primary pyrolysis device, and the high-temperature heat-carrying medium after heat exchange enters the ash pipeline to absorb heat again and circulate.
Compared with the prior art, the energy-saving system for preparing the biomass oil by using the waste heat of the ash residue of the power plant, provided by the invention, at least has the following beneficial effects:
according to the invention, the ash residue heat exchange pipeline is utilized to absorb the high-temperature waste heat in the ash residue of the power plant, and the process is combined with the process flow of preparing the biomass oil by biomass pyrolysis, so that the waste heat of the ash residue of the power plant is recovered, the biomass oil is prepared by utilizing the waste heat, the energy loss of the power plant is reduced, the biomass energy is produced, the economy of the power plant is improved, the waste heat of the power plant can be effectively utilized, and the energy-saving effect is achieved;
the method realizes the conversion from low-grade energy to high-grade energy by using the waste heat of the ash residue of the power plant to prepare the biomass oil, and the heat energy is stored in the form of fuel, thereby being beneficial to long-time storage.
Drawings
FIG. 1 is a schematic structural diagram of an energy-saving system for preparing biomass oil by using waste heat of power plant ash in the embodiment;
the reference numbers in the figures indicate:
1. the heat transfer pipeline, 2, the pump, 3, the lime-ash pipeline, 4, the dry grinder of living beings, 5, elementary pyrolysis device, 6, second grade pyrolysis device, 7, condensing equipment, 8, living beings oil collection device, 9, quick cooling pipeline.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
The invention relates to an energy-saving system for preparing biomass oil by using waste heat of ash residues of a power plant, which comprises: a primary pyrolysis section, a secondary pyrolysis section, and a heat source section.
Primary pyrolysis section: this part is used for carrying out preliminary pyrolysis with living beings, forms high-quality biomass feedstock, prepares for further second grade pyrolysis, and this part includes:
the biomass drying and grinding device 4 is used for drying and grinding the biomass raw material, and a heat source required by drying can be selected according to actual conditions, such as: ash residue waste heat, flue gas waste heat and the like;
primary pyrolysis device 5 utilizes the lime-ash waste heat as the heat source of primary pyrolysis, carries out preliminary pyrolysis preliminary treatment with the dry biomass feedstock who grinds back, is favorable to improving the output and the quality of second grade pyrolysis. The primary pyrolysis device 5 comprises a heat exchange area and a pyrolysis area, heat can be transferred between the two areas, and the working process is as follows: after the biomass raw material is dried and ground through the drying and grinding chamber 4, the biomass raw material enters the pyrolysis zone in the primary pyrolysis device 5 to be subjected to primary pyrolysis, and the high-temperature heat-carrying medium coming out of the secondary pyrolysis device 6 releases heat in the heat exchange zone in the primary pyrolysis device 5 to provide required temperature environment and heat for the primary pyrolysis.
And (3) secondary pyrolysis part: the part further pyrolyzes the biomass after the primary pyrolysis to produce biomass oil, and the part comprises:
second grade pyrolysis device 6 for high-quality living beings after accomplishing elementary pyrolysis carry out high-temperature pyrolysis, produce required biomass gas, second grade pyrolysis device 6 can be divided into heat transfer district and pyrolysis district, and heat can be transferred between two regions, and its working process is: biomass raw materials which are subjected to primary pyrolysis in the primary pyrolysis device 1 enter a pyrolysis zone in the secondary pyrolysis device 6 through a pipeline for pyrolysis, high-temperature biomass gas generated after pyrolysis enters a condensing device 7 through a pipeline, the high-temperature biomass gas is condensed into biomass oil by using cooling water in a cooling water pipeline 9, and the biomass oil is collected and stored by using a biomass oil collecting device 8;
a condensing unit 7 for condensing the generated biomass gas with feed water to form biomass oil;
the biomass oil collecting device 8 is connected with the condensing device 7 and is used for collecting biomass oil generated after condensation;
and the rapid cooling pipeline 9 runs through the condensing device 7 and is used for rapidly condensing the biomass gas into the biomass oil.
A heat source part: the part provides a heat source with temperature grade required by pyrolysis for the pyrolysis process by using waste heat of ash, and the part comprises:
the high-temperature heat-carrying medium flows in the heat exchange pipeline 1, and the waste heat of the ash residue of the power plant boiler is transferred to the secondary pyrolysis device 6;
the pump 2 is used for providing power required by forced flow for the high-temperature heat-carrying medium and enhancing the heat exchange effect;
and the ash slag pipeline 3 is used for carrying out non-contact type convection heat exchange on the ash slag generated by the power plant boiler and the high-temperature heat-carrying medium in the heat exchange pipeline 1.
As shown in fig. 1, the connection mode of the devices is as follows: the heat exchange pipeline 1 is respectively connected with the ash pipeline 3, the primary pyrolysis device 5 and the secondary pyrolysis device 6, a pump 2 is arranged in the heat exchange pipeline 1, a high-temperature heat-carrying medium in the heat exchange pipeline 1 is driven to enter the ash pipeline 3 to absorb heat, the high-temperature heat-carrying medium which completes heat absorption sequentially enters the secondary pyrolysis device 6 and the primary pyrolysis device 5 to release heat according to temperature grades, and the high-temperature heat-carrying medium which completes heat release enters the ash pipeline 3 again to absorb heat so as to circulate. The pyrolysis process of the biomass comprises the following steps: biomass feedstock carries out elementary pyrolysis through elementary pyrolysis device 5 earlier, and reentrant second grade pyrolysis device 6 carries out the second grade pyrolysis, and the pyrolysis product utilizes living beings oil collection device 8 to collect after carrying out quick cooling treatment through condensing equipment 7.
High-temperature heat-carrying materials are selected in the heat exchange pipeline 1, such as: high temperature heat conducting oil. The selected material can be selected according to actual requirements.
The energy-saving system of the invention has the following specific working process:
when ash in the boiler passes through the ash pipeline 3, a high-temperature heat-carrying medium in the heat exchange pipeline 1 enters the ash pipeline 3 under the driving of the pump 2 to exchange heat with the high-temperature ash and absorb heat, and the high-temperature heat-carrying medium absorbing heat enters a heat exchange area in the secondary pyrolysis device 6 to release heat so as to provide heat required by pyrolysis at the temperature level of 500-600 ℃ for a pyrolysis area in the secondary pyrolysis device 6; the high-temperature heat-carrying medium which emits part of heat enters a heat exchange area in the primary pyrolysis chamber 5 to emit heat, heat required by pyrolysis at the temperature of 200-300 ℃ is provided for the pyrolysis area in the primary pyrolysis chamber 5, and the high-temperature heat-carrying medium after heat exchange enters the ash pipeline 3 to absorb heat again and circulate.
And the good living beings raw materials of collection at first get into dry grinding equipment 4 and carry out dry grinding, the dry living beings raw materials of grinding get into the pyrolysis zone in primary pyrolysis device 5 through the pipeline and carry out primary pyrolysis, in the pyrolysis, the pyrolysis environment is in anaerobism or anaerobic environment, living beings raw materials accomplish the primary pyrolysis of living beings under 200 ℃ -300 ℃ anaerobism or anaerobic condition, the living beings raw materials of accomplishing primary pyrolysis then enter the pyrolysis zone in secondary pyrolysis device 6 through the pipeline and carry out the second grade pyrolysis, in the pyrolysis, the pyrolysis environment is in anaerobism or anaerobic environment, the living beings raw materials of accomplishing primary pyrolysis carry out the second grade pyrolysis under 500 ℃ -600 ℃ anaerobism or anaerobic condition, pyrolysis catalyst participates in the pyrolysis simultaneously, reduce the required temperature grade of pyrolysis, the output of improvement pyrolysis and the quality of pyrolysis product. Accomplish the biomass feedstock of elementary pyrolysis after accomplishing the second grade pyrolysis, most living beings pyrolysis conversion is high temperature biomass gas, and this part of high temperature biomass gas gets into condensing equipment 7 and carries out quick cooling, and the living beings oil that produces after the cooling is accomplished then utilizes living beings oil collection device 8 to collect and store.
For the application of the system in practical cases, different biomass raw materials, heat required by pyrolysis, oil yield and the like are different, and pine is taken as an example: pine is used as a raw material of biomass, and the heat required when the primary pyrolysis temperature reaches 257 ℃ is 371kJ/kg, and the heat required when the secondary pyrolysis temperature reaches 500 ℃ is 600 kJ/kg. Meanwhile, when the biomass oil is prepared by utilizing the ash residue waste heat, the temperature grade required by primary pyrolysis is 200-300 ℃, the temperature grade required by secondary pyrolysis is 500-600 ℃, so that the ash residue waste heat is required to have a higher temperature grade, and the ash temperature is at least required to be more than or equal to 600 ℃. Taking a certain coal gangue power plant as an example, the temperature of ash in the power plant is 900 ℃, the proportion of the thermal physical loss of the ash is 5.12 percent, and the thermal physical loss of the ash is 8.2 multiplied by 106kJ/h, wherein 71% of heat energy is effectively utilized, high-temperature heat conduction oil is used as a heat carrying medium for heat exchange, when the temperature of the heat conduction oil at the secondary pyrolysis outlet is 550 ℃ and the temperature of the heat conduction oil at the primary pyrolysis outlet is 275 ℃, the system takes pine as a biomass raw material, and when the unit is in a full-load operation state, the biomass oil generated by ash residue waste heat is utilized, and the yield can reach 2 t/h.
According to the invention, the ash residue heat exchange pipeline is utilized to absorb the high-temperature waste heat in the ash residue of the power plant, and the process is combined with the process flow of preparing the biomass oil by biomass pyrolysis, so that the biomass oil is prepared by utilizing the waste heat while recovering part of the ash residue waste heat of the power plant, the energy loss of the power plant is reduced, the biomass energy is produced, the economy of the power plant is improved, the waste heat of the power plant can be effectively utilized, and the energy-saving effect is achieved.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an utilize economizer system of power plant's ash residue waste heat preparation living beings oil which characterized in that includes:
the primary pyrolysis part is used for carrying out primary pyrolysis on the biomass raw material to generate primary biomass and preparing for secondary pyrolysis;
a secondary pyrolysis part, which is used for further pyrolyzing the primary biomass after the primary pyrolysis to generate biomass oil;
and in the heat source part, the waste heat of ash slag is utilized to provide a heat source with a temperature grade required by pyrolysis for each stage of pyrolysis process.
2. The energy-saving system for preparing bio-oil by using waste heat of power plant ash as claimed in claim 1, wherein the primary pyrolysis part comprises a biomass drying and grinding device for drying and grinding the biomass raw material, and a primary pyrolysis device for performing primary pretreatment on the dried and ground biomass raw material by using the waste heat of ash as a heat source of the primary pyrolysis.
3. The energy-saving system for preparing bio-oil by using waste heat of power plant ash according to claim 2, wherein the secondary pyrolysis part comprises a secondary pyrolysis device for performing high-temperature pyrolysis on the primary biomass after the primary pyrolysis is completed to generate a required bio-gas, a condensing device for condensing the generated required bio-gas to form bio-oil, and a bio-oil collecting device for collecting the bio-oil generated after the condensation.
4. The energy-saving system for preparing bio-oil by using waste heat of power plant ash residue as claimed in claim 3, wherein the secondary pyrolysis part further comprises a rapid cooling pipeline for rapidly condensing the bio-gas into bio-oil, and the rapid cooling pipeline penetrates through the condensing device.
5. The energy-saving system for preparing biomass oil by using waste heat of power plant ash and slag as claimed in claim 3, wherein the heat source part comprises a heat exchange pipeline for circulating high-temperature heat-carrying medium and transferring the waste heat of power plant boiler ash and slag to the secondary pyrolysis device, a pump for providing power for forced flow of the high-temperature heat-carrying medium and an ash and slag pipeline for non-contact convection heat exchange of the high-temperature heat-carrying medium in the heat exchange pipeline.
6. The energy-saving system for preparing the biomass oil by using the waste heat of the power plant ash and slag as claimed in claim 5, wherein the pump drives the high-temperature heat-carrying medium in the heat exchange pipeline to firstly enter the ash and slag pipeline to absorb heat, the high-temperature heat-carrying medium which finishes heat absorption sequentially enters the secondary pyrolysis device and the primary pyrolysis device from large to small according to temperature grades to release heat, and after heat release is finished, the high-temperature heat-carrying medium enters the ash and slag pipeline again to absorb heat, so that circulation is performed.
7. The energy-saving system for preparing the biomass oil by using the waste heat of the power plant ash residue as claimed in claim 3, wherein the primary pyrolysis device comprises a heat exchange region and a pyrolysis region, heat can be transferred between the two regions, the biomass raw material is dried and ground by a biomass drying and grinding device, then enters the pyrolysis region in the primary pyrolysis device for primary pyrolysis, and a high-temperature heat-carrying medium flowing out of the secondary pyrolysis device releases heat in the heat exchange region in the primary pyrolysis device.
8. The energy-saving system for preparing bio-oil by using waste heat of power plant ash as claimed in claim 7, wherein the secondary pyrolysis device comprises a heat transfer region and a pyrolysis region, heat can be transferred between the two regions, the biomass raw material in the primary pyrolysis device, which is subjected to primary pyrolysis, enters the pyrolysis region in the secondary pyrolysis device through a pipeline for pyrolysis, high-temperature biomass gas generated after pyrolysis enters the condensing device through a pipeline, the high-temperature biomass gas is condensed into bio-oil by using cooling water in the cooling water pipeline, and the bio-oil is collected and stored by using the bio-oil collecting device.
9. The energy-saving system for preparing biomass oil by using waste heat of power plant ash according to claim 8, wherein when ash in a power plant boiler passes through the ash pipeline, a high-temperature heat-carrying medium in the heat exchange pipeline enters the ash pipeline under the driving of a pump to exchange heat with the high-temperature ash to absorb heat, and the high-temperature heat-carrying medium absorbing heat enters a heat exchange area in the secondary pyrolysis device to release heat so as to provide heat required by pyrolysis at a temperature level of 500-600 ℃ for a pyrolysis area in the secondary pyrolysis device.
10. The energy-saving system for preparing the biomass oil by using the waste heat of the power plant ash and slag according to claim 9, wherein the high-temperature heat-carrying medium which emits part of heat enters a heat exchange area in the primary pyrolysis device to emit heat, the heat required by pyrolysis at the temperature of 200-300 ℃ is provided for the pyrolysis area in the primary pyrolysis device, and the high-temperature heat-carrying medium after heat exchange enters the ash and slag pipeline to absorb heat again and circulate.
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| CN107267174A (en) * | 2017-06-22 | 2017-10-20 | 张晓敏 | Biomass pyrolytic oil-producing technique |
| CN109847657A (en) * | 2019-01-22 | 2019-06-07 | 华中科技大学 | A kind of the fluidized bed pyrolysis reacting furnace and reaction method of fuse salt heat supply |
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