阅读说明：本技术 一种分布式生物质气化与燃烧耦合的多联产系统和方法 (distributed biomass gasification and combustion coupled poly-generation system and method ) 是由 王�华 刘慧利 胡建杭 于 2019-09-17 设计创作，主要内容包括：本发明涉及一种分布式生物质气化与燃烧耦合的多联产系统和方法,属于能源与环境技术领域。该多联产系统包括一级系统、二级系统和三级系统,一级系统中生物质在流化床气化炉中气化生成含焦油的生物质粗燃气和生物质炭,含焦油的生物质燃气进入燃气有机热载体加热炉燃烧放热加热导热油,同时生物质颗粒在生物质直燃有机热载体炉内燃烧放热加热导热油；二级系统采用有机朗肯循环发电的方式利用高温导热油的热量；三级系统采用余热锅炉、蒸汽型溴化锂制冷机组和换热器回收燃气有机热载体加热炉和生物质直燃有机热载体炉中产生的高温烟气余热,实现对用户的冷热联供。本发明不同能量形式的比例可灵活调节,实现生物质能高效梯级利用,提高综合利用率。(the invention relates to a distributed biomass gasification and combustion coupled poly-generation system and method, belonging to the technical field of energy and environment. The poly-generation system comprises a primary system, a secondary system and a tertiary system, wherein biomass in the primary system is gasified in a fluidized bed gasification furnace to generate biomass crude gas containing tar and biomass charcoal, the biomass gas containing tar enters a gas organic heat carrier heating furnace to burn and release heat to heat conduction oil, and meanwhile, biomass particles burn and release heat to heat conduction oil in a biomass direct-fired organic heat carrier heating furnace; the secondary system utilizes the heat of the high-temperature heat-conducting oil in an organic Rankine cycle power generation mode; the three-level system adopts a waste heat boiler, a steam type lithium bromide refrigerating unit and a heat exchanger to recover high-temperature flue gas waste heat generated in a fuel gas organic heat carrier heating furnace and a biomass direct-fired organic heat carrier furnace, and realizes combined supply of heat and cold for users. The proportion of different energy forms can be flexibly adjusted, the efficient cascade utilization of biomass energy is realized, and the comprehensive utilization rate is improved.)

1. a distributed biomass gasification and combustion coupled poly-generation system is characterized in that: comprises a primary system, a secondary system and a tertiary system,

The primary system comprises a biomass bin (1), a fluidized bed gasification furnace (2), a high-temperature cyclone separator (3), a fuel gas organic heat carrier heating furnace (4), a crude fuel gas purification device (5), a biomass fuel gas storage cabinet (6), a biomass direct-fired organic heat carrier furnace (7) and a high-temperature heat conduction oil storage tank (8), a biomass particle discharge port at the bottom of the biomass bin (1) is communicated with a feed port of the fluidized bed gasification furnace (2), a crude fuel gas outlet at the top of the fluidized bed gasification furnace (2) is communicated with the high-temperature cyclone separator (3), biomass charcoal outlets are arranged at the bottoms of the fluidized bed gasification furnace (2) and the high-temperature cyclone separator (3), the high-temperature cyclone separator (3) is respectively communicated with a fuel gas inlet of the fuel gas organic heat carrier heating furnace (4) and the crude fuel gas purification device (5) through a three-way valve, and an outlet of the crude fuel gas purification device (5) is communicated with the biomass fuel gas storage cabinet (6);

the secondary system comprises a high-temperature heat-conducting oil pump (9), an organic working medium evaporator (10), an organic working medium preheater (11), a low-temperature heat-conducting oil storage tank (12), a low-temperature heat-conducting oil pump I (13), a low-temperature heat-conducting oil pump II (14), a screw expander (15), a generator (16), a condenser (17), a liquid storage device (18) and a working medium pump (19), an outlet of the high-temperature heat conduction oil storage tank (8) is communicated with a heat conduction oil inlet of the organic working medium evaporator (10), a working medium steam outlet of the organic working medium evaporator (10) is communicated with a screw expander (15), the screw expander (15) generates electricity through a generator (16), an outlet of the screw expander (15) is sequentially communicated with a condenser (17) and a liquid storage device (18), an organic working medium outlet of the liquid storage device (18) is communicated with the organic working medium preheater (11), and an organic working medium outlet of the organic working medium preheater (11) is communicated with the organic working medium evaporator (10); a heat conduction oil outlet of the organic working medium evaporator (10) is communicated with the organic working medium preheater (11), a heat conduction oil outlet of the organic working medium preheater (11) is communicated with the low-temperature heat conduction oil storage tank (12), a heat conduction oil outlet of the low-temperature heat conduction oil storage tank (12) is respectively communicated with a heat conduction oil inlet of the fuel gas organic heat carrier heating furnace (4) and a heat conduction oil inlet of the biomass direct-fired organic heat carrier heating furnace (7), a heat conduction oil outlet of the fuel gas organic heat carrier heating furnace (4) is communicated with a heat conduction oil inlet of the high-temperature heat conduction oil storage tank (8), and a heat conduction oil outlet of the biomass direct-fired organic heat carrier heating furnace (7;

the three-stage system comprises a waste heat boiler (20), a lithium bromide unit (21), a heat exchanger (22), an air preheater (23), a ceramic multi-tube dust remover (24), a bag-type dust remover (25), an induced draft fan (26) and a chimney (27), high-temperature smoke outlets of a fuel gas organic heat carrier heating furnace (4) and a biomass direct-fired organic heat carrier furnace (7) are communicated with an outer-layer pipeline in the waste heat boiler (20), steam in an inner-layer pipeline in the waste heat boiler (20) is in counter flow with respect to high-temperature smoke, a steam outlet of the waste heat boiler (20) is respectively communicated with the lithium bromide unit (21) and the heat exchanger (22), a medium-low temperature smoke outlet of the waste heat boiler (20) is communicated with a smoke pipeline of the air preheater (23), air of the air preheater (23) is in counter flow with respect to medium-low temperature smoke, an air outlet of the air preheater (23), the low-temperature smoke outlet of the air preheater (23) is communicated with the ceramic multi-tube dust collector (24) and the bag-type dust collector (25) in sequence, and the smoke outlet of the bag-type dust collector (25) is communicated with the induced draft fan (26) and the chimney (27) in sequence.

2. the distributed biomass gasification and combustion coupled polygeneration system of claim 1, wherein: a high-temperature heat conduction oil pump (9) is arranged between an outlet of a high-temperature heat conduction oil storage tank (8) in the secondary system and a heat conduction oil inlet of an organic working medium evaporator (10), a working medium pump (19) is arranged between an organic working medium outlet of a liquid storage device (18) and an organic working medium preheater (11), a heat conduction oil outlet of a low-temperature heat conduction oil storage tank (12) is communicated with a heat conduction oil inlet of a fuel gas organic heat carrier heating furnace (4) through a low-temperature heat conduction oil pump I (13), and a heat conduction oil outlet of the low-temperature heat conduction oil storage tank (12) is communicated with a heat conduction oil inlet of a biomass direct-fired organic heat carrier heating furnace.

3. A distributed biomass gasification and combustion coupled poly-generation method is characterized in that a distributed biomass gasification and combustion coupled poly-generation system is adopted, and the method comprises the following specific steps:

(1) Biomass particle fuel in a biomass bin enters a fluidized bed gasification furnace to perform gasification reaction with air to form biomass crude gas containing tar and biomass charcoal, the biomass charcoal is discharged from a biomass charcoal outlet at the bottom of the fluidized bed gasification furnace, the biomass crude gas containing the tar is discharged from a crude gas outlet at the top of the fluidized bed gasification furnace and enters a high-temperature cyclone separator to be subjected to cyclone separation to obtain biomass charcoal and crude gas containing the tar, the biomass charcoal is discharged from a biomass charcoal outlet at the bottom of the high-temperature cyclone separator, the crude gas containing the tar is discharged from the top of the high-temperature cyclone separator and is shunted by a three-way valve, part of the crude gas containing the tar enters a crude gas purifying device to be purified to obtain biomass gas, and the biomass gas enters a biomass gas storage cabinet to be stored; the other part of the tar-containing crude fuel gas enters the fuel gas organic heat carrier heating furnace through a fuel gas inlet of the fuel gas organic heat carrier heating furnace to be combusted and released to heat the heat transfer oil to obtain high-temperature heat transfer oil, meanwhile, the biomass granular fuel is conveyed to the biomass direct-fired organic heat carrier heating furnace to be combusted and released to heat the heat transfer oil to obtain high-temperature heat transfer oil, and the high-temperature heat transfer oil is stored in a high-temperature heat transfer oil storage;

(2) high-temperature heat conduction oil in the high-temperature heat conduction oil storage tank is introduced into an organic working medium evaporator to heat a liquid organic working medium, the organic working medium is heated and evaporated to generate steam, the organic steam enters a screw expander to do work and output mechanical energy to drive a generator to generate electricity, exhaust steam enters a condenser to be condensed, then enters an organic working medium liquid storage device, is pressurized by a working medium pump and then enters an organic working medium preheater; the heat conducting oil at the outlet of the organic working medium evaporator enters an organic working medium preheater to preheat liquid organic working medium, and the heated liquid organic working medium enters the organic working medium evaporator to be heated and evaporated again; the low-temperature heat conducting oil discharged by the organic working medium preheater enters a low-temperature heat conducting oil storage tank, and the low-temperature heat conducting oil is introduced into a fuel gas organic heat carrier heating furnace and/or a biomass direct-fired organic heat carrier furnace through a heat conducting oil pump to be heated to obtain high-temperature heat conducting oil;

(3) The high-temperature flue gas generated by burning crude gas in the gas organic heat carrier heating furnace and the high-temperature flue gas generated by burning biomass particle fuel in the biomass direct-fired organic heat carrier heating furnace are combined and then enter a waste heat boiler to heat water to generate steam, the steam and the high-temperature flue gas perform countercurrent heat exchange to increase the temperature, part of the steam is sent to a steam type lithium bromide refrigerating unit to be used for refrigeration, the other part of the steam is sent to a heat exchanger to be used for heat supply, the combined supply of heat and cold of the high-temperature flue gas waste heat is realized, the medium-low temperature flue gas at the outlet of the waste heat boiler is introduced into an air preheater to perform countercurrent heat exchange with air to preheat air, the air is preheated and then sent to a burner of the gas organic heat carrier.

Technical Field

the invention relates to a distributed biomass gasification and combustion coupled poly-generation system and method, belonging to the technical field of energy and environment.

background

the biomass energy has the advantages of wide distribution, large reserves, sustainable development and utilization and the like, and is considered as a potential alternative energy source of fossil fuels. The clean and efficient utilization of the biomass energy is widely concerned worldwide, and has a good application prospect.

Although biomass has the advantages of large resource storage, renewability and the like, the problems of dispersion in distribution, low energy density, high oxygen content, high collection and transportation cost and the like exist, so that the biomass is suitable for being utilized locally and nearby in a distributed energy system mode. The distributed energy system is arranged on the user side, directly provides energy in different forms such as electricity, cold and heat for the user, can better recover waste heat resources, and realizes efficient gradient utilization of the energy. The distributed energy system has the advantages of high energy utilization efficiency, high energy supply safety, good environmental protection performance and the like.

At present, the main modes of biomass energy utilization comprise biomass gasification, biomass direct combustion, biomass pyrolysis, biomass-to-biogas technology and the like. The biomass gasification technology mainly aims at producing biomass gas, can co-produce biomass charcoal, is a high-quality smelting reducing agent and fuel, and has a wide application range. The biomass gas can be used as a civil fuel to replace urban gas or used for power generation, has the advantages of cleanness, environmental protection, energy conservation, emission reduction and the like, and is researched and applied more and more at present. The biomass direct combustion is to directly burn the biomass as fuel, convert chemical energy of the biomass into heat energy, supply heat to a user or produce steam by using the heat energy produced in the burning process, and then drive a steam turbine generator unit to generate electricity, and the method has mature technology.

The biomass gas and the biomass charcoal can be obtained simultaneously by adopting a biomass gasification mode. The biomass fuel gas can be directly supplied to users after being purified, and can also be used for power generation. The biomass gasification power generation is mainly realized by three modes, one mode is that biomass gas is purified and then sent into a gas turbine to output mechanical energy to drive a generator to generate power, the second mode is that the purified gas is sent into an internal combustion engine to generate power directly, the third mode is that the purified gas is sent into a gas boiler directly to burn and release heat to generate steam, and then the steam drives a turbine to generate power, wherein the third mode is the method which has the most extensive application and the most mature technology of the current biomass gasification power generation. Therefore, if a distributed energy system is built based on the biomass gasification technology, the distributed energy system can simultaneously supply power to adjacent users and provide several high-quality energy products such as biomass gas and biomass charcoal, and meanwhile, the high-temperature flue gas waste heat generated in the biomass gas power generation process can be utilized to supply heat and cool for the users. Therefore, the requirements of users on different varieties of energy sources can be met by a biomass gasification mode, but the energy source requirement structure of the users in different seasons and different time periods continuously changes and fluctuates greatly along with time, the flexible adjustment of the proportion of different energy source varieties provided by the distributed energy system cannot be realized by simply depending on the biomass gasification mode, the energy source requirement structure is not adaptive to the randomness of the use of the various energy source varieties by the users, and the actual energy use requirements of the users cannot be met.

disclosure of Invention

The invention provides a distributed biomass gasification and combustion coupled power generation and gas, carbon, cold and heat poly-generation system and a method, aiming at the problems and the defects in the prior art, the system can convert biomass energy into clean electric energy, biomass gas and biomass carbon, supply cold and heat to users, realize high-efficiency cascade utilization of the biomass energy, improve the comprehensive energy utilization efficiency of the biomass energy, meet the random requirements of the users on the use of various energy varieties and meet the actual energy utilization requirements of the users.

The distributed biomass gasification and combustion coupled poly-generation system comprises a primary system, a secondary system and a tertiary system, biomass in the primary system is gasified in a fluidized bed gasification furnace to generate biomass crude gas containing tar and biomass charcoal, the biomass gas containing tar enters a gas organic heat carrier heating furnace to be combusted to release heat to heat conduction oil, and meanwhile biomass particles are combusted in a biomass direct-fired organic heat carrier heating furnace to release heat to heat conduction oil; the secondary system utilizes the heat of the high-temperature heat-conducting oil in an organic Rankine cycle power generation mode; the three-level system adopts a waste heat boiler, a steam type lithium bromide refrigerating unit and a heat exchanger to recover high-temperature flue gas waste heat generated in a fuel gas organic heat carrier heating furnace and a biomass direct-fired organic heat carrier furnace, and realizes combined supply of heat and cold for users. In the whole process, the proportion among different energy forms such as electric load, biomass gas, biomass charcoal, cold load and heat load can be flexibly and effectively adjusted, the efficient cascade utilization of biomass energy is realized, and the comprehensive energy utilization efficiency of the biomass energy is improved.

The technical scheme adopted by the invention for solving the technical problem is as follows:

A distributed biomass gasification and combustion coupled poly-generation system comprises a primary system, a secondary system and a tertiary system,

the primary system comprises a biomass bin 1, a fluidized bed gasification furnace 2, a high-temperature cyclone separator 3, a fuel gas organic heat carrier heating furnace 4, a crude fuel gas purification device 5, a biomass fuel gas storage cabinet 6, a biomass direct-fired organic heat carrier furnace 7 and a high-temperature heat conduction oil storage tank 8, a biomass particle discharge port at the bottom of the biomass bin 1 is communicated with a feed port of the fluidized bed gasification furnace 2, a crude fuel gas outlet at the top of the fluidized bed gasification furnace 2 is communicated with the high-temperature cyclone separator 3, biomass charcoal outlets are arranged at the bottoms of the fluidized bed gasification furnace 2 and the high-temperature cyclone separator 3, the high-temperature cyclone separator 3 is respectively communicated with a fuel gas inlet of the fuel gas organic heat carrier heating furnace 4 and the crude fuel gas purification device 5 through a three-way valve;

The secondary system comprises a high-temperature heat conduction oil pump 9, an organic working medium evaporator 10, an organic working medium preheater 11, a low-temperature heat conduction oil storage tank 12, a low-temperature heat conduction oil pump I13, a low-temperature heat conduction oil pump II 14, a screw expander 15, a generator 16, a condenser 17, a liquid storage device 18 and a working medium pump 19, wherein an outlet of the high-temperature heat conduction oil storage tank 8 is communicated with a heat conduction oil inlet of the organic working medium evaporator 10, a working medium steam outlet of the organic working medium evaporator 10 is communicated with the screw expander 15, the screw expander 15 generates electricity through the generator 16, an outlet of the screw expander 15 is sequentially communicated with the condenser 17 and the liquid storage device 18, an organic working medium outlet of the liquid storage device 18 is communicated with the organic working medium preheater 11, and an organic working; a heat conduction oil outlet of the organic working medium evaporator 10 is communicated with an organic working medium preheater 11, a heat conduction oil outlet of the organic working medium preheater 11 is communicated with a low-temperature heat conduction oil storage tank 12, a heat conduction oil outlet of the low-temperature heat conduction oil storage tank 12 is respectively communicated with a heat conduction oil inlet of a fuel gas organic heat carrier heating furnace 4 and a heat conduction oil inlet of a biomass direct-fired organic heat carrier heating furnace 7, a heat conduction oil outlet of the fuel gas organic heat carrier heating furnace 4 is communicated with a heat conduction oil inlet of a high-temperature heat conduction oil storage tank 8, and a heat conduction oil outlet of the biomass direct-;

The three-stage system comprises a waste heat boiler 20, a lithium bromide unit 21, a heat exchanger 22, an air preheater 23, a ceramic multi-tube dust remover 24, a bag-type dust remover 25, an induced draft fan 26 and a chimney 27, wherein high-temperature smoke outlets of a fuel gas organic heat carrier heating furnace 4 and a biomass direct-fired organic heat carrier heating furnace 7 are communicated with an outer-layer pipeline in the waste heat boiler 20, steam in the inner-layer pipeline in the waste heat boiler 20 is in counter flow with respect to high-temperature smoke, a steam outlet of the waste heat boiler 20 is communicated with the lithium bromide unit 21 and the heat exchanger 22 respectively, a medium-low-temperature smoke outlet of the waste heat boiler 20 is communicated with a smoke pipeline of the air preheater 23, air of the air preheater 23 is in counter flow with respect to medium-low-temperature smoke, an air outlet of the air preheater 23 is communicated with an air multi, The bag-type dust collector 25 is communicated, and the smoke outlet of the bag-type dust collector 25 is sequentially communicated with the induced draft fan 26 and the chimney 27.

a high-temperature heat conduction oil pump 9 is arranged between an outlet of a high-temperature heat conduction oil storage tank 8 in the secondary system and a heat conduction oil inlet of an organic working medium evaporator 10, a working medium pump 19 is arranged between an organic working medium outlet of a liquid storage device 18 and an organic working medium preheater 11, a heat conduction oil outlet of a low-temperature heat conduction oil storage tank 12 is communicated with a heat conduction oil inlet of a fuel gas organic heat carrier heating furnace 4 through a low-temperature heat conduction oil pump I13, and a heat conduction oil outlet of the low-temperature heat conduction oil storage tank 12 is communicated with a heat conduction oil inlet of a biomass direct-fired.

a distributed biomass gasification and combustion coupled poly-generation method adopts a distributed biomass gasification and combustion coupled poly-generation system, and comprises the following specific steps:

(1) biomass particle fuel in a biomass bin enters a fluidized bed gasification furnace to perform gasification reaction with air to form biomass crude gas containing tar and biomass charcoal, the biomass charcoal is discharged from a biomass charcoal outlet at the bottom of the fluidized bed gasification furnace, the biomass crude gas containing the tar is discharged from a crude gas outlet at the top of the fluidized bed gasification furnace and enters a high-temperature cyclone separator to be subjected to cyclone separation to obtain biomass charcoal and crude gas containing the tar, the biomass charcoal is discharged from a biomass charcoal outlet at the bottom of the high-temperature cyclone separator, the crude gas containing the tar is discharged from the top of the high-temperature cyclone separator and is shunted by a three-way valve, part of the crude gas containing the tar enters a crude gas purifying device to be purified to obtain biomass gas, and the biomass gas enters a biomass gas storage cabinet to be stored; the other part of the tar-containing crude fuel gas enters the fuel gas organic heat carrier heating furnace through a fuel gas inlet of the fuel gas organic heat carrier heating furnace to be combusted and released to heat the heat transfer oil to obtain high-temperature heat transfer oil, meanwhile, the biomass granular fuel is conveyed to the biomass direct-fired organic heat carrier heating furnace to be combusted and released to heat the heat transfer oil to obtain high-temperature heat transfer oil, and the high-temperature heat transfer oil is stored in a high-temperature heat transfer oil storage;

(2) high-temperature heat conduction oil in the high-temperature heat conduction oil storage tank is introduced into an organic working medium evaporator to heat a liquid organic working medium, the organic working medium is heated and evaporated to generate steam, the organic steam enters a screw expander to do work and output mechanical energy to drive a generator to generate electricity, exhaust steam enters a condenser to be condensed, then enters an organic working medium liquid storage device, is pressurized by a working medium pump and then enters an organic working medium preheater; the heat conducting oil at the outlet of the organic working medium evaporator enters an organic working medium preheater to preheat liquid organic working medium, and the heated liquid organic working medium enters the organic working medium evaporator to be heated and evaporated again; the low-temperature heat conducting oil discharged by the organic working medium preheater enters a low-temperature heat conducting oil storage tank, and the low-temperature heat conducting oil is introduced into a fuel gas organic heat carrier heating furnace and/or a biomass direct-fired organic heat carrier furnace through a heat conducting oil pump to be heated to obtain high-temperature heat conducting oil;

(3) the high-temperature flue gas generated by burning crude gas in the gas organic heat carrier heating furnace and the high-temperature flue gas generated by burning biomass particle fuel in the biomass direct-fired organic heat carrier heating furnace are combined and then enter a waste heat boiler to heat water to generate steam, the steam and the high-temperature flue gas perform countercurrent heat exchange to increase the temperature, part of the steam is sent to a steam type lithium bromide refrigerating unit to be used for refrigeration, the other part of the steam is sent to a heat exchanger to be used for heat supply, the combined supply of heat and cold of the high-temperature flue gas waste heat is realized, the medium-low temperature flue gas at the outlet of the waste heat boiler is introduced into an air preheater to perform countercurrent heat exchange with air to preheat air, the air is preheated and then sent to a burner of the gas organic heat carrier.

the temperature of biomass crude gas at the inlet of the cyclone separator in the step (1) is 500 ~ 900 ℃, a small amount of biomass carbon output from the bottom of the high ~ temperature cyclone separator is mixed with biomass carbon output from the bottom of a fluidized bed through a screw conveyor to obtain a biomass carbon product, 60 ~ 105 kg of biomass carbon can be produced per ton of biomass, the crude gas is purified by a crude gas purification device, the removal rate of tar and particles in the crude gas is more than 95%, the temperature of heat conduction oil can be increased to 130 ~ 320 ℃ from 60 ~ 100 ℃ by burning heat release in a gas organic heat carrier heating furnace to heat the heat conduction oil, and the temperature of the heat conduction oil can be increased to 130 ~ 320 ℃ from 60 ~ 90 ℃ by burning heat release in a biomass direct ~ fired organic heat carrier heating furnace;

the high ~ temperature heat conduction oil in the step (2) is sent into a dividing wall type organic working medium evaporator to perform countercurrent heat exchange with the liquid organic working medium, heat is transferred to the organic working medium, the organic working medium is heated and evaporated to generate steam, the temperature of the steam can reach 100 ~ 180 ℃, and the temperature of the heat conduction oil from the organic working medium evaporator is 85 ~ 110 ℃, so that the temperature of the liquid organic working medium in the organic working medium preheater can be increased from 30 ~ 40 ℃ to 50 ~ 70 ℃;

the exhaust temperature of high ~ temperature flue gas generated by the fuel gas organic heat carrier heating furnace in the step (3) is 700 ~ 1000 ℃, the exhaust temperature of high ~ temperature flue gas generated by the biomass direct ~ fired organic heat carrier heating furnace is 700 ~ 1000 ℃, and water in the waste heat boiler can be heated to generate steam at the temperature of 150 ~ 250 ℃.

In the invention, tar in the crude gas does not need to be purified, the crude gas is directly fed into the gas organic heat carrier heating furnace in a high-temperature state, and the tar in the crude gas and the biomass gas are combusted together in a gaseous form to release heat;

the biomass direct-fired organic heat carrier boiler adopts a chain grate boiler, is simple to operate, convenient to start and stop, and large in load adjusting range, and is beneficial to quickly adjusting the power generation load and the cold and hot loads of a system;

The crude fuel gas generated in the operation process of the fluidized bed gasification furnace is used for supplying gas to a user after purification and directly burning for power generation, and power generation is carried out on the premise of ensuring continuous and stable gas supply and sufficient gas supply to the user; carrying out peak regulation by utilizing a biomass direct-combustion organic heat carrier furnace and an organic Rankine cycle generator set, and quickly regulating a power generation load and cold and heat loads; on the premise of meeting the power load and cold and heat loads of nearby users, redundant electric energy generated by the system is merged into a power grid.

the invention has the beneficial effects that:

(1) The utilization of the biomass can effectively reduce the emission of pollutants such as SOx, NOx and the like, and is beneficial to CO₂Emission reduction and remarkable environmental benefit are achieved by utilizing biomass energy;

(2) according to the invention, biomass with high oxygen content and low energy density is converted into clean electric energy, biomass fuel gas and biomass charcoal with high energy density, so that the energy quality of the biomass energy is improved;

(3) the invention adopts the combination mode of the waste heat boiler, the steam type lithium bromide refrigerating unit and the heat exchanger to recover the waste heat of the high-temperature flue gas, can supply cold and heat for users at the same time, realizes the high-efficiency cascade utilization of the biomass energy and improves the comprehensive energy utilization efficiency of the biomass energy;

(4) The system can simultaneously meet various energy utilization requirements of users, and can flexibly and effectively adjust the proportion among different energy forms such as power load, biomass gas, biomass charcoal, cold load and heat load according to the actual energy utilization requirements of the users at different time periods;

(5) The system is distributed near the users, is suitable for being constructed in remote areas far away from a power grid or areas with insufficient power supply and relatively rich biomass resources, can reduce energy transmission cost, and realizes local and nearby utilization of biomass energy resources.

Drawings

FIG. 1 is a schematic diagram of a distributed biomass gasification and combustion coupled polygeneration system configuration of the present invention;

FIG. 2 is a process flow diagram of a distributed biomass gasification and combustion coupled polygeneration method of the present invention.

in the figure: 1-a biomass bin, 2-a fluidized bed gasification furnace and 3-a high-temperature cyclone separator; 4-a fuel gas organic heat carrier heating furnace, 5-a crude fuel gas purification device, 6-a biomass fuel gas storage cabinet, 7-a biomass direct-combustion organic heat carrier furnace, 8-a high-temperature heat conduction oil storage tank, 9-a high-temperature heat conduction oil pump, 10-an organic working medium evaporator, 11-an organic working medium preheater, 12-a low-temperature heat conduction oil storage tank, 13-a low-temperature heat conduction oil pump I, 14-a low-temperature heat conduction oil pump II, 15-a screw expander, 16-a generator, 17-a condenser, 18-a liquid storage device, 19-a working medium pump, 20-a waste heat boiler, 21-a steam type lithium bromide refrigerating unit, 22-a heat exchanger, 23-an air preheater, 24-a ceramic multi-pipe dust remover, 25-a bag dust remover, 26-an.

Detailed Description

The present invention will be further described with reference to the following embodiments.