CN108692480A - A kind of distributed polygenerations systeme based on gasification of biomass and earth source heat pump - Google Patents
A kind of distributed polygenerations systeme based on gasification of biomass and earth source heat pump Download PDFInfo
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- 239000002028 Biomass Substances 0.000 title claims abstract description 58
- 238000002309 gasification Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 claims abstract description 26
- 238000010521 absorption reaction Methods 0.000 claims abstract description 19
- 239000000428 dust Substances 0.000 claims abstract description 9
- 238000000746 purification Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 20
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- 238000001816 cooling Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
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- 239000000463 material Substances 0.000 description 2
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- 241000209094 Oryza Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
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Abstract
本发明公开了一种基于生物质气化和地源热泵的分布式多联产系统，该分布式多联产系统包括气化炉、第一换热器、第二换热器、第三换热器、净化除尘器、内燃机、烟气热水型吸收式制冷机、第四换热器、第五换热器、压缩机、冷凝器、节流阀、蒸发器、水泵和地下换热器。本发明集成了生物质气化和地源热泵两种能源技术，通过系统集成及能源梯级利用实现了两种能源高效应用。该系统总能效率高达80％以上，对于可再生能源集成，优化既有能源供应系统结构，降低环境碳排放具有重要现实意义。
The invention discloses a distributed polygeneration system based on biomass gasification and ground source heat pump. The distributed polygeneration system includes a gasifier, a first heat exchanger, a second heat exchanger, and a third heat exchanger. Heater, purification dust collector, internal combustion engine, flue gas hot water type absorption refrigerator, fourth heat exchanger, fifth heat exchanger, compressor, condenser, throttle valve, evaporator, water pump and underground heat exchanger . The invention integrates two energy technologies of biomass gasification and ground source heat pump, and realizes efficient application of the two energy sources through system integration and energy cascade utilization. The total energy efficiency of the system is as high as 80%, which is of great practical significance for the integration of renewable energy, optimizing the structure of the existing energy supply system, and reducing environmental carbon emissions.
Description
技术领域technical field
本发明涉及生物质与地热能利用技术领域，特别是一种基于生物质气化和地源热泵的分布式多联产系统。The invention relates to the technical field of utilization of biomass and geothermal energy, in particular to a distributed polygeneration system based on biomass gasification and ground source heat pump.
背景技术Background technique
作为国家经济的基础，也是人类赖以生存和发展的物质基础，能源占有举足轻重的低位。随着社会发展及人民生活水平提高，能源消耗不断增加。从2005年到2015年，全球能源消耗增长显著。同时，随着科技进步和环保意识的提高，除了追求高效的能源供应系统之外，还希望能源结构正朝着清洁化、低碳化方向前进。As the foundation of the national economy and the material basis for human survival and development, energy occupies a pivotal position. With the development of society and the improvement of people's living standards, energy consumption continues to increase. From 2005 to 2015, global energy consumption increased significantly. At the same time, with the advancement of science and technology and the improvement of environmental protection awareness, in addition to pursuing an efficient energy supply system, it is also hoped that the energy structure will move towards clean and low-carbonization.
分布式多联产系统是建立在用户端，考虑用户不同能量产品需求的一种新型能源系统，通过就近布置降低输送损失，同时减少初始投资。此外，考虑用户的产品需求，使得能源利用更为合理。由于其独立性、能源高效利用以及环境友好型而受到广泛关注。分布式多联产系统是基于物理能和化学能的综合梯级利用原理，根据不同输入能源及输出能源的品位实现对口应用，因此其能量利用更加合理，总体能源效率更加突出。随着化石燃料的大规模利用，所带来的环境问题日益突出，而可再生能源的应用有利于降低环境影响。根据国家能源发展战略行动计划指出，通过优化能源结构，大幅度增加风电、太阳能、地热能等可再生能源的比例，争取到2020年非化石能源占一次能源消费比重达15％左右。因此，基于可再生能源的分布式多联产系统不仅能降低环境影响，更符合目前可持续发展的战略需求。The distributed polygeneration system is a new type of energy system that is built on the user side and considers the needs of different energy products of the user. It reduces the transmission loss and reduces the initial investment by arranging nearby. In addition, considering the product needs of users makes energy utilization more reasonable. It has attracted a lot of attention due to its independence, energy efficiency and environmental friendliness. The distributed polygeneration system is based on the principle of comprehensive cascade utilization of physical energy and chemical energy, and realizes corresponding applications according to the grades of different input energy and output energy. Therefore, its energy utilization is more reasonable and the overall energy efficiency is more prominent. With the large-scale utilization of fossil fuels, the environmental problems brought about have become increasingly prominent, and the application of renewable energy is conducive to reducing environmental impact. According to the National Energy Development Strategy Action Plan, by optimizing the energy structure, the proportion of renewable energy such as wind power, solar energy, and geothermal energy will be greatly increased, and non-fossil energy will account for about 15% of primary energy consumption by 2020. Therefore, the distributed polygeneration system based on renewable energy can not only reduce environmental impact, but also meet the current strategic needs of sustainable development.
生物质资源根据不同的来源可以进行分类，如农林水产类、废弃物类和种植型类等，但都主要通过光合作用将太阳能储存与其内部，本质意义是生物质是太阳能的一种。由于其排放二氧化碳循环周期与化石能源相比时间很短，经常被称作碳中性燃料。此外，生物质资源丰富、再生周期短、易于获得，但是也存在能量密度低等特点。因此，需要通过一定技术手段对生物质加以利用。常见的利用方式有裂解、气化、液化和燃烧等，而生物质气化技术通过将固体或液体生物燃料转化为气体燃料易于储存并加以利用而受到广泛关注。地源热泵通过利用高品位电能将低品位热能转移到高品位热能加以进一步利用，是利用浅层地热能的一种有效方式，由于地热能不受季节和气候的影响，使得其利用相对稳定。但是，目前对现有设计理念和实施方案的基于生物质和浅层地热能利用的能源系统研究存在的主要问题有：1)可再生能源既有耦合方式缺乏集成深度；2)联产系统烟气利用缺乏一定合理性，导致余热利用效率较低；3)联产系统输出产品配比单一，缺乏一定灵活性及可调性；4)单一地源热泵运行COP较低，造成其能量损失及损都较大。因此，通过生物质气化与地源热泵两者相结合，实现生物质与浅层地热能不同品位能量的高效梯级利用是需要解决的关键问题。Biomass resources can be classified according to different sources, such as agriculture, forestry and aquatic products, waste, and planting types, etc., but all of them store solar energy in their interior mainly through photosynthesis. The essential meaning is that biomass is a kind of solar energy. Because of the short cycle time for emitting carbon dioxide compared to fossil fuels, they are often referred to as carbon-neutral fuels. In addition, biomass resources are abundant, the regeneration period is short, and they are easy to obtain, but they also have the characteristics of low energy density. Therefore, it is necessary to utilize certain technical means to utilize biomass. Common utilization methods include cracking, gasification, liquefaction, and combustion, etc. Biomass gasification technology has attracted widespread attention by converting solid or liquid biofuels into gaseous fuels for easy storage and utilization. Ground source heat pump is an effective way to utilize shallow geothermal energy by transferring low-grade thermal energy to high-grade thermal energy by using high-grade electric energy for further utilization. Since geothermal energy is not affected by seasons and climates, its utilization is relatively stable. However, the main problems in the current research on energy systems based on biomass and shallow geothermal energy utilization in the existing design concepts and implementation schemes are: 1) the existing coupling methods of renewable energy lack integration depth; 3) The output product ratio of the cogeneration system is single, which lacks certain flexibility and adjustability; 4) The COP of a single ground source heat pump is low, resulting in its energy loss and The losses are larger. Therefore, through the combination of biomass gasification and ground source heat pump, it is a key problem to be solved to realize the efficient cascade utilization of different grades of biomass and shallow geothermal energy.
发明内容Contents of the invention
(一)要解决的技术问题(1) Technical problems to be solved
为了进一步提高集成多种可再生能源利用效率，满足不同用户的需求，本发明提出了一种基于生物质气化和地源热泵的分布式多联产系统。In order to further improve the utilization efficiency of integrated multiple renewable energy sources and meet the needs of different users, the present invention proposes a distributed polygeneration system based on biomass gasification and ground source heat pump.
(二)技术方案(2) Technical solution
为了达到上述目的，本发明提供了一种基于生物质气化和地源热泵的分布式多联产系统，其特征在于，该系统包括气化炉、第一换热器、第二换热器、第三换热器、净化除尘器、内燃机、烟气热水型吸收式制冷机、第四换热器、第五换热器、压缩机、冷凝器、节流阀、蒸发器、水泵和地下换热器，其中：气化炉，用于将生物质和第一换热器出口的水蒸气、第二换热器出口的高温空气一起参与气化反应，生成生物质合成气，满足后续内燃机发电的燃料需求；第一换热器，利用气化炉出口高温生物质合成气加热来自于第四换热器出口的中温水，从而产生水蒸气，满足生物质气化炉中气化反应的需求；第二换热器，利用第一换热器出口生物质合成气的高温热能预热空气，从而满足生物质气化炉中气化反应的需求；第三换热器，利用第二换热器出口生物质合成气的中温热能加热来自于内燃机的缸套水，提高进入烟气热水型吸收式制冷机的缸套水温度；净化除尘器，用于对第三换热器出口生物质合成气进行净化除尘处理，出去合成气中的灰分和冷凝水；内燃机，利用经过降温净化处理的净化除尘器出口常温合成气驱动内燃机发电；烟气热水型吸收式制冷机，利用内燃机出口一部分高温烟气和经过第三换热器加热的缸套水热能产冷冻水，从而满足用户冷量需求；第四换热器，利用烟气热水型吸收式制冷机出口烟气热能预热常温常压水；第五换热器，利用内燃机出口一部分烟气再热冷凝器出口中温水，从而生产用户所需热水(50-55℃)，满足用户热水需求；水泵，用于对蒸发器出口的水进行加压，使其通入到地下换热器中进行换热；地下换热器，利用水泵出口的水与地下介质进行换热，提供蒸发器换热所需热量；蒸发器，利用地下换热器出口的水的热量加热制冷剂，从而通入到压缩机中；压缩机，用于对蒸发器出口的制冷剂加压处理，使制冷剂达到过热状态；冷凝器，利用压缩机出口的制冷剂热量，加热进口侧常温常压水至35-45℃的中温水；节流阀，用于对冷凝器出口制冷剂进行节流降温降压，使得制冷剂达到湿蒸汽状态。In order to achieve the above object, the present invention provides a distributed polygeneration system based on biomass gasification and ground source heat pump, which is characterized in that the system includes a gasifier, a first heat exchanger, and a second heat exchanger , the third heat exchanger, purification and dust collector, internal combustion engine, flue gas hot water type absorption refrigerator, the fourth heat exchanger, the fifth heat exchanger, compressor, condenser, throttle valve, evaporator, water pump and The underground heat exchanger, in which: the gasifier, is used to participate in the gasification reaction together with the biomass, the water vapor at the outlet of the first heat exchanger, and the high-temperature air at the outlet of the second heat exchanger to generate biomass synthesis gas, which meets the requirements of subsequent Fuel demand for internal combustion engine power generation; the first heat exchanger uses the high-temperature biomass synthesis gas at the outlet of the gasifier to heat the medium-temperature water from the outlet of the fourth heat exchanger, thereby generating water vapor to meet the gasification reaction in the biomass gasifier The second heat exchanger uses the high-temperature thermal energy of the biomass synthesis gas at the outlet of the first heat exchanger to preheat the air, thereby meeting the needs of the gasification reaction in the biomass gasifier; the third heat exchanger uses the The medium-temperature heat energy of the biomass synthesis gas at the outlet of the heat exchanger heats the cylinder jacket water from the internal combustion engine to increase the temperature of the cylinder jacket water entering the flue gas hot water absorption refrigerator; the purification dust collector is used for the third heat exchange The biomass synthesis gas at the outlet of the device is purified and dust-removed to remove the ash and condensed water in the synthesis gas; the internal combustion engine uses the normal-temperature synthesis gas at the outlet of the purified dust collector that has been cooled and purified to drive the internal combustion engine to generate electricity; the flue gas hot water type absorption refrigerator, Use part of the high-temperature flue gas at the outlet of the internal combustion engine and the jacket water heated by the third heat exchanger to produce chilled water to meet the cooling capacity requirements of users; the fourth heat exchanger uses the flue gas hot water type absorption refrigerator to export flue gas Thermal energy preheats water at normal temperature and pressure; the fifth heat exchanger uses a part of the flue gas at the outlet of the internal combustion engine to reheat the medium-temperature water at the outlet of the condenser, thereby producing hot water (50-55°C) required by users to meet the hot water needs of users; the water pump, It is used to pressurize the water at the outlet of the evaporator so that it passes into the underground heat exchanger for heat exchange; the underground heat exchanger uses the water at the outlet of the water pump to exchange heat with the underground medium to provide the heat exchange required by the evaporator Heat; the evaporator uses the heat of the water at the outlet of the underground heat exchanger to heat the refrigerant, and then passes it into the compressor; the compressor is used to pressurize the refrigerant at the outlet of the evaporator to make the refrigerant reach a superheated state; The condenser uses the heat of the refrigerant at the outlet of the compressor to heat the normal temperature and pressure water on the inlet side to the medium temperature water at 35-45°C; the throttle valve is used to throttle the refrigerant at the outlet of the condenser to reduce the temperature and pressure so that the refrigerant to a state of wet steam.
(三)有益效果(3) Beneficial effects
从上述技术方案可以看出，本发明具有以下有益效果：As can be seen from the foregoing technical solutions, the present invention has the following beneficial effects:
1、本发明提供的基于生物质气化和地源热泵的分布式多联产系统，通过生物质气化和地源热泵技术相结合，实现对生物质和浅层地热能的耦合应用，不仅能降低对化石能源的消耗，更能降低二氧化碳排放。1. The distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention realizes the coupled application of biomass and shallow geothermal energy through the combination of biomass gasification and ground source heat pump technology, not only It can reduce the consumption of fossil energy and reduce carbon dioxide emissions.
2、本发明提供的基于生物质气化和地源热泵的分布式多联产系统，通过生物质与利用生物质合成气预热后的空气、水蒸气一起参与气化反应，生成高温合成气通过内燃机做功发电，实现生物质化学能向电力的转化。2. The distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention can generate high-temperature syngas through biomass, air and water vapor preheated by biomass syngas to participate in the gasification reaction The conversion of biomass chemical energy into electricity is realized through the internal combustion engine to generate power.
3、本发明提供的基于生物质气化和地源热泵的分布式多联产系统，通过利用生物质合成气的热能加热缸套水，增加进入烟气热水型吸收式制冷机的热水温度，从而提升制冷机冷量输出。3. The distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention can increase the hot water entering the flue gas hot water type absorption refrigerator by using the thermal energy of biomass synthesis gas to heat the cylinder jacket water temperature, thereby increasing the cooling output of the refrigerator.
4、本发明提供的基于生物质气化和地源热泵的分布式多联产系统，依次通过冷凝器和第五换热器实现常温水温度的分级提升，同时通过内燃机发电驱动压缩机正常运行。4. The distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention realizes the step-by-step increase of the normal temperature water temperature through the condenser and the fifth heat exchanger in turn, and at the same time drives the compressor to run normally through the internal combustion engine. .
5、本发明提供的基于生物质气化和地源热泵的分布式多联产系统，内燃机高温排烟一部分通入烟气热水型吸收式制冷机，一部分通入第五换热器，通过控制分流比实现冷热产品分配，从而调节冷热产品比例，增强分布式多联产系统灵活性。5. In the distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention, part of the high-temperature exhaust smoke from the internal combustion engine is passed into the flue gas hot water type absorption refrigerator, and part of it is passed into the fifth heat exchanger. Control the split ratio to realize the distribution of cold and hot products, thereby adjusting the ratio of cold and hot products and enhancing the flexibility of the distributed polygeneration system.
附图说明Description of drawings
图1是本发明提供的基于生物质气化和地源热泵的分布式多联产系统的示意图。Fig. 1 is a schematic diagram of a distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚明白，以下结合具体实施例，并参照附图，对本发明进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
如图1所示，是本发明提供的基于生物质气化和地源热泵的分布式多联产系统的示意图，该系统包括气化炉、第一换热器、第二换热器、第三换热器、净化除尘器、内燃机、烟气热水型吸收式制冷机、第四换热器、第五换热器、压缩机、冷凝器、节流阀、蒸发器、水泵和地下换热器。As shown in Figure 1, it is a schematic diagram of a distributed polygeneration system based on biomass gasification and ground source heat pump provided by the present invention, the system includes a gasifier, a first heat exchanger, a second heat exchanger, and a second heat exchanger. Three heat exchangers, purification and dust collectors, internal combustion engines, flue gas hot water type absorption refrigerators, fourth heat exchangers, fifth heat exchangers, compressors, condensers, throttle valves, evaporators, water pumps and underground heat exchangers heater.
生物质原料(1)与经过第一换热器预热的水蒸气(13)、经过第二换热器预热的空气(15)一起进入生物质气化炉，发生气化反应生成高温生物质合成气(2)，然后进入第一换热器中，利用合成气高温热能加热来自于第四换热器出口的水(12)，经过加热的高温水蒸气(13)进入气化炉参与气化反应，随后高温合成气(3)进入第二换热器预热空气(14)，经过预热的空气(15)进入气化炉参与气化反应。合成气进入第三换热器用于加热来自内燃机的缸套水(16)，从而提高进入烟气热水型吸收式制冷机中缸套水(17)温度，经过降温处理的生物质合成气(5)进入净化除尘器中出去灰分和冷凝水(33)。常温常压合成气(6)随后通入内燃机发电做功，生产高温烟气(7)一部分通入烟气热水型吸收式制冷机驱动制冷剂产冷冻水(25)，另一部分进入第五换热器进一步再热地源热泵子系统中冷凝器出口中温水(22)，同时烟气热水型吸收式制冷机出口中温烟气(9)通入第四换热器中用于预热进入第一换热器中的水(11)。在地源热泵子系统中制冷剂(28)与地下换热器中水(30)进行换热，从而间接吸收来自土壤的热量，经过加热的制冷剂(29)进入压缩机，进一步压缩成过热状态(26)，随后制冷剂进入冷凝器中与常温常压水进行换热产中温水(22)，经过冷凝的制冷剂(27)进入节流阀节流降压处理，随后通入蒸发器完成热泵热力循环。此外，内燃机所发电力一方面提供用户需求，另一方面用于维持压缩机和水泵正常运行所需电量。The biomass raw material (1) enters the biomass gasification furnace together with the water vapor (13) preheated by the first heat exchanger and the air (15) preheated by the second heat exchanger, and a gasification reaction occurs to generate high-temperature biomass. The material synthesis gas (2) then enters the first heat exchanger, uses the high-temperature heat energy of the synthesis gas to heat the water (12) from the outlet of the fourth heat exchanger, and the heated high-temperature water vapor (13) enters the gasifier to participate in Gasification reaction, then the high-temperature syngas (3) enters the second heat exchanger to preheat air (14), and the preheated air (15) enters the gasification furnace to participate in the gasification reaction. The synthesis gas enters the third heat exchanger for heating the cylinder jacket water (16) from the internal combustion engine, thereby increasing the temperature of the cylinder jacket water (17) entering the flue gas hot water type absorption refrigerator, and the biomass synthesis gas ( 5) Enter the purification dust collector to remove ash and condensed water (33). Normal temperature and pressure syngas (6) is then fed into the internal combustion engine to generate power to produce high-temperature flue gas (7) part of which is passed into the flue gas hot water type absorption refrigerator to drive the refrigerant to produce chilled water (25), and the other part enters the fifth exchange The heater further reheats the medium-temperature water (22) at the outlet of the condenser in the ground source heat pump subsystem, and at the same time, the medium-temperature flue gas (9) at the outlet of the flue gas hot water type absorption refrigerator is passed into the fourth heat exchanger for preheating. Water (11) in the first heat exchanger. In the ground source heat pump subsystem, the refrigerant (28) exchanges heat with the water (30) in the underground heat exchanger, thereby indirectly absorbing the heat from the soil. The heated refrigerant (29) enters the compressor and is further compressed into a superheated state (26), then the refrigerant enters the condenser to exchange heat with water at normal temperature and pressure to produce medium-warm water (22), and the condensed refrigerant (27) enters the throttle valve for throttling and pressure reduction treatment, and then passes into the evaporator Complete the heat pump thermodynamic cycle. In addition, the power generated by the internal combustion engine provides user needs on the one hand, and is used to maintain the power required for the normal operation of compressors and water pumps on the other hand.
本发明所提供的基于生物质气化和地源热泵的分布式多联产系统装置在具体实施例中可采用主要参数如表1所示。选取农村地区常见的稻壳作为研究对象，以1600kg/h稻壳输入量进行系统性能计算，空气输入量为600kg/h，为方便计算，内燃机高温排烟按1:1分别通入烟气热水型吸收式制冷机和第五换热器中，选取R22作为制冷剂。The main parameters of the distributed polygeneration system device based on biomass gasification and ground source heat pump provided by the present invention in specific embodiments are shown in Table 1. The common rice husk in rural areas was selected as the research object, and the system performance was calculated with the rice husk input of 1600kg/h, and the air input was 600kg/h. In the water-type absorption refrigerator and the fifth heat exchanger, R22 is selected as the refrigerant.
表1Table 1
表2Table 2
本发明中地热能输入量为1000kW，经过地源热泵利用浅层地热能，其总能效率达80.65％。该耦合系统集成生物质和浅层地热能两种可再生能源，同时提升了多联产系统总能效率，实现了不同可再生能源系统集成互补。In the present invention, the geothermal energy input is 1000kW, and the shallow geothermal energy is utilized through the ground source heat pump, and the total energy efficiency reaches 80.65%. The coupling system integrates two renewable energy sources, biomass and shallow geothermal energy, and at the same time improves the total energy efficiency of the polygeneration system, realizing the integration and complementarity of different renewable energy systems.
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