CN108928913B - IC reactor heating system based on gas generator set and compression heat pump - Google Patents
IC reactor heating system based on gas generator set and compression heat pump Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
- C02F2301/106—Thermophilic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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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
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention discloses an IC reactor heating system based on a gas generator set and a compression heat pump. The IC reactor firstly processes the wastewater to generate biogas, and then purifies the biogas to meet the requirements of a gas generator set; the electricity generated is then used to drive a compression heat pump to recover heat from the IC reactor outlet waste water. Meanwhile, the waste heat discharged from the tank sleeve of the gas generator set can be recovered to effectively utilize the energy, so that high-temperature hot water is generated and used for heating the inlet wastewater of the IC reactor. The system has two operation modes, wherein one mode is that the outlet wastewater of the IC reactor and the waste heat recovery of the gas generator set heat the inlet wastewater; the other is a gas-fired power generating set combined compression heat pump, so that the temperature of the IC reactor can be maintained in an optimal temperature range all year round. The system can effectively utilize energy and reduce energy and economic investment.
Description
Technical Field
The invention relates to the technical field of equipment for producing biogas by anaerobic reaction fermentation of sewage, in particular to an IC reactor heating system based on a gas generator set and a compression heat pump.
Background
The IC reactor was a high-efficiency anaerobic reactor developed successfully by Paques corporation of the Netherlands in the 80 s. The IC reactor is characterized in that the methane is separated into two stages in a high reactor, the lower reaction zone is under high load, the upper reaction zone is under low load, the methane generated in the lower reaction zone is used as power to realize the internal circulation of the mixed liquid in the lower reaction zone, so that the wastewater is subjected to enhanced pretreatment; meanwhile, the upper reaction zone continuously carries out post-treatment on the wastewater, so that the effluent reaches the expected anaerobic treatment (1 IC reactor for treating wastewater in pig farms research-Huangzhiping). Because the optimal growth temperature of most anaerobic bacteria (mainly methane bacteria and hydrolytic bacteria) is 30-35 ℃, the proper environmental temperature and small temperature fluctuation are important conditions for stable operation of the IC reactor (2 UASB _ IC reactor for organic wastewater operation characteristic research, Liangguang), and in view of the factor, the efficiency of a plurality of cities in China can be greatly reduced when the IC reactor is used in winter, and the treated sewage is often difficult to meet the requirements.
In order to ensure that the temperature in the reactor is maintained in a relatively constant range, the traditional method mostly adopts a methane boiler mode (3) the design of a solar energy-methane boiler and methane tank combined system-Zhaohui), but the methane boiler has low utilization efficiency, and part of heat can be discharged along with smoke. More importantly, the waste water at the outlet of the IC reactor contains a large amount of waste heat, but cannot be effectively utilized. In view of the defects, the invention firstly collects the methane generated by the IC reactor in the gas storage tank, then sends the methane to the gas generator set for power generation, and is provided with a waste heat recovery circulating water device for the flue gas and the cylinder sleeve of the gas generator set, the generated electricity is used for driving the compression heat pump to recover the waste heat in the waste water at the outlet of the IC reactor and is used for heating the waste water at the inlet of the IC reactor, so that the IC reactor maintains relatively constant temperature, and the IC reactor is ensured to operate at relatively high efficiency.
Disclosure of Invention
In view of the above technical problems, the present invention provides an IC reactor (anaerobic reactor, hereinafter referred to as IC reactor) heating system based on a gas generator set and a compression heat pump, so that biogas generated by the IC reactor can compensate for energy loss thereof, and waste heat in the outlet wastewater of the IC reactor is recovered for heating the inlet wastewater to efficiently utilize energy.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an IC reactor heating system based on a gas generator set and a compression heat pump mainly comprises an IC reactor, a gas storage tank, a gas generator set and a compression heat pump system; the IC reactor introduces inlet wastewater through an inlet wastewater pipe and discharges outlet wastewater through an outlet wastewater pipe;
the IC reactor is internally provided with a mixing area, the bottom of the mixing area is provided with a water inlet, and granular sludge is also reserved, and the water inlet of the IC reactor, the granular sludge and the mud-water mixture reflowed from the gas-liquid separation area are effectively mixed in the mixing area; a first anaerobic zone is arranged above the mixing zone, high-concentration sludge is arranged in the first anaerobic zone, most organic matters are converted into methane under the action of the sludge-water mixture after the sludge-water mixture enters the first anaerobic zone, the methane is continuously discharged in the form of micro bubbles, the micro bubbles are continuously merged in the ascending process to gradually form larger bubbles, the sludge-water mixture with thinner sludge concentration is formed at the upper part of a sludge layer due to the stirring of the methane, and the sludge-water mixture is lifted to a gas-liquid separation zone at the top by the methane; a second anaerobic zone is arranged above the first anaerobic zone, residual wastewater treated by the first anaerobic zone enters the second anaerobic zone through a three-phase separator, the sludge concentration of the second anaerobic zone is low, the methane is less in methane production amount, the methane is guided into a gas-liquid separation zone through a methane pipe, the disturbance to the second anaerobic zone is small, the sludge can stay in the zone for a long time, a settling zone is arranged above the second anaerobic zone, the settling zone performs solid-liquid separation on a sludge-water mixture, supernatant is discharged through a water outlet pipe, precipitated granular sludge returns to a sludge bed of the second anaerobic zone, a gas-liquid separation zone is arranged above the settling zone, the sludge-water mixture and the methane are separated in the gas-liquid separation zone and are led out of a treatment system, the sludge-water mixture returns to a mixing zone at the lowest end along a return pipe and is fully mixed with the sludge and inlet water at the bottom of the IC reactor, and internal circulation of mixed liquid; the methane enters a gas storage tank through a pipeline above the IC reactor; the bottom of the gas storage tank is provided with an outlet, and the methane is sent to a gas generator set through a pipeline to generate electricity;
the gas generator set comprises a set, an exhaust pipeline, an exhaust heat exchanger and a waste heat recovery circulating water device, wherein the waste heat recovery circulating water device is used for recovering heat to heat the waste water at the inlet of the IC reactor, and the generated electric quantity is used for driving the compression heat pump system to work;
the compression type heat pump system mainly comprises an evaporator, a compressor, a throttle valve and a condenser, the four devices are connected through pipelines, refrigerants are arranged in the pipelines, and the compression type heat pump system recovers waste heat in the waste water at the outlet of the IC reactor and is used for heating the waste water at the inlet of the IC reactor.
Further, the IC reactor heating system based on the gas generator set and the compression heat pump further comprises a heat exchanger group, wherein the heat exchanger group comprises a heat exchanger I, a heat exchanger II, a heat exchanger III and a heat exchanger IV; the heat exchanger I and the heat exchanger III are both installed on an inlet waste water pipe, the heat exchanger I is connected with the condenser, the condenser is used for heating inlet waste water of the IC reactor through the heat exchanger I, the heat exchanger III is connected with the gas generator set, heat of the gas generator set is used for heating the inlet waste water through the heat exchanger III, the heat exchanger II is installed between the inlet waste water pipe and an outlet waste water pipe and used for heating the inlet waste water through the heat exchanger II by outlet waste water of the IC reactor, the heat exchanger IV is installed on the outlet waste water pipe and connected with the evaporator, and the evaporator indirectly recovers waste heat in the outlet waste water of the IC reactor through the heat exchanger IV.
The heat exchanger I and the heat exchanger II are heat exchangers for exchanging heat between water and water, the heat exchanger IV is a heat exchanger for exchanging heat between water and a refrigerant, the heat exchanger III is a heat exchanger for exchanging heat between water and gas, and the heat exchangers II, I, IV and III are respectively used for exchanging heat between waste water and waste water, between waste water and clean hot water, between waste water and refrigerant and between clean water and waste gas of a gas generator set.
Further, the system has two modes of operation: the first operation mode is that when the temperature of the inlet wastewater of the IC reactor is lower, the temperature of the outlet wastewater is relatively higher, and the inlet wastewater can be heated by combining the waste heat recovery heat of the gas generator set; the second operation mode is that when the temperature of the inlet wastewater of the IC reactor is higher, the gas generator set is combined with the compression heat pump system, and at the moment, the heat of the outlet wastewater recovered by the compression heat pump system, the waste heat of the gas generator set and the heat recovered by the cylinder sleeve heat the inlet wastewater of the IC reactor, so that the temperature of the IC reactor can be maintained in the optimal temperature range all year round.
Further, the first operation mode is specifically: when the temperature of the inlet wastewater of the IC reactor is lower, the outlet wastewater of the IC reactor directly heats the inlet wastewater through a heat exchanger II; and the biogas generated by the IC reactor is sent to a gas generator set for power generation, the waste heat of the unit flue gas is recovered through an exhaust heat exchanger and a waste heat recovery circulating water device of the gas generator set, and the waste heat is used for heating the inlet wastewater passing through the heat exchanger II so as to achieve the optimal temperature range of the IC reactor.
Further, the second operation mode is specifically: when the temperature of the inlet wastewater of the IC reactor is higher, the outlet wastewater cannot be directly heated for the inlet wastewater, at the moment, methane enters a gas generator set to generate electricity, the generated electricity is used for driving a compression heat pump system to recover waste heat in the outlet wastewater, indirect heat exchange is adopted in the recovery process, the recovered heat firstly heats the inlet wastewater, then the recovered heat of the gas generator set heats the inlet wastewater through a heat exchanger III, the temperature requirement of the IC reactor can be met all the year round, anaerobic bacteria in anaerobic sludge can be guaranteed to treat sewage under higher activity, the yield of the methane is increased, and the treatment efficiency is improved.
Compared with the prior art, the invention has the beneficial effects that: the heating system has two operation modes, wherein one mode is that the outlet wastewater of an IC reactor and the waste heat recovery of a gas generator set heat the inlet wastewater; another mode is a gas-fired power plant combined with a compression heat pump so that the temperature of the IC reactor can be maintained within an optimum temperature range throughout the year. In the two modes, the heating system can effectively utilize the methane generated by the IC reactor and recover waste heat in the waste water at the outlet of the IC reactor, so that the temperature of the IC reactor can be maintained in an optimal temperature range all year round, a virtuous cycle is formed, the system can be continuously used, energy sources are effectively utilized, and energy sources and economic investment are reduced.
Drawings
FIG. 1 is a schematic diagram of an IC reactor heating system of the present invention.
FIG. 2 is a schematic diagram of a first mode of a heating system for an IC reactor.
FIG. 3 is a schematic diagram of a second mode of heating system for an IC reactor.
Wherein, 1-inlet waste water pipe; 2, a heat exchanger I; 3-heat exchanger II; 4-heat exchanger III; 5-IC reactor; 6-a mixing zone; 7-a first anaerobic zone; 8-a second anaerobic zone; 9-a precipitation zone; 10-gas-liquid separation zone; 11-exhaust gas heat exchanger; 12-an exhaust duct; 13-a gas storage tank; 14-a gas generator set; 15-a compressor; 16-outlet waste; 17-heat exchanger IV; 18-evaporator, 19-throttle valve, 20-condenser.
Detailed Description
For a better understanding of the technical solutions of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and specific embodiments:
as shown in fig. 1, the heating system of the IC reactor based on the gas generator set and the compression heat pump mainly comprises an IC reactor 5, a gas storage tank, a gas generator set 14, a compression heat pump system and a heat exchanger set; the IC reactor 5 introduces inlet wastewater through an inlet wastewater pipe 1 and discharges outlet wastewater through an outlet wastewater pipe 16;
the IC reactor 5 is internally provided with a mixing area 6, the bottom of the mixing area 6 is provided with a water inlet, and granular sludge is also reserved, and the water inlet of the IC reactor 5, the granular sludge and the mud-water mixture reflowed from the gas-liquid separation area are effectively mixed in the area; a first anaerobic zone 7 is arranged above the mixing zone 6, high-concentration sludge is arranged in the first anaerobic zone 7, most organic matters are converted into methane under the action of the sludge-water mixture after the sludge-water mixture enters the first anaerobic zone 7, the methane is continuously discharged in the form of micro bubbles, the micro bubbles are continuously merged in the ascending process to gradually form larger bubbles, the sludge-water mixture with thinner sludge concentration is formed at the upper part of a sludge layer due to the stirring of the methane, and the sludge-water mixture is lifted to a gas-liquid separation zone 10 at the top by the methane; a second anaerobic zone 8 is arranged above the first anaerobic zone 7, the residual wastewater treated by the first anaerobic zone 7 enters the second anaerobic zone 8 through a three-phase separator, the sludge concentration of the second anaerobic zone 8 is lower, the biogas generation amount is less, the biogas is guided into a gas-liquid separation zone 10 through a biogas pipe, the disturbance to the second anaerobic zone 8 is small, sludge can stay in the zone for a long time, a settling zone 9 is arranged above the second anaerobic zone 8, the sedimentation zone 9 carries out solid-liquid separation on the mud-water mixture, supernatant is discharged by a water outlet pipe, the settled granular sludge returns to a sludge bed of the second anaerobic zone 8, a gas-liquid separation zone 10 is arranged above the sedimentation zone 9, the mud-water mixture is separated from the methane in the gas-liquid separation zone 10 and led out of the treatment system, the mud-water mixture returns to the mixing zone 6 at the lowest end along the return pipe, the sludge is fully mixed with the sludge at the bottom of the IC reactor 5 and the inlet water, so that the internal circulation of the mixed liquid is realized; the marsh gas enters a gas storage tank through a pipeline above the IC reactor 5; the bottom of the gas storage tank is provided with an outlet, and the methane is sent to a gas generator set 14 through a pipeline to generate electricity;
the gas generator set 14 comprises a set, an exhaust pipeline 12 and an exhaust heat exchanger 11, and is provided with a waste heat recovery circulating water device, the recovered heat is used for heating the waste water at the inlet of the IC reactor 5, and the generated electric quantity is used for driving a compression heat pump system to work;
the compression type heat pump system mainly comprises an evaporator 18, a compressor 15, a throttle valve 19 and a condenser 20, the four devices are connected through pipelines, refrigerants are arranged in the pipelines, and the compression type heat pump system recovers waste heat in the waste water at the outlet of the IC reactor 5 and uses the waste heat to heat the waste water at the inlet of the IC reactor 5.
The heat exchanger group comprises a heat exchanger I2, a heat exchanger II 3, a heat exchanger III 4 and a heat exchanger IV 17; the heat exchanger I2 and the heat exchanger III 4 are both installed on an inlet waste water pipe 1, the heat exchanger I2 is connected with the condenser 20, the condenser 20 is used for heating inlet waste water of the IC reactor 5 through the heat exchanger I2, the heat exchanger III 4 is connected with the gas generator set 14, heat of the gas generator set 14 is used for heating the inlet waste water through the heat exchanger III 4, the heat exchanger II 3 is installed between the inlet waste water pipe 1 and an outlet waste water pipe 16 and used for heating the inlet waste water through the heat exchanger II 3 by outlet waste water of the IC reactor 5, the heat exchanger IV 17 is installed on the outlet waste water pipe 16 and connected with the evaporator 18, and the evaporator 18 indirectly recovers waste heat in the outlet waste water of the IC reactor 5 through the heat exchanger IV 17.
The heat exchanger I2 and the heat exchanger II 3 are heat exchangers for exchanging heat between water and water, the heat exchanger IV 17 is a heat exchanger for exchanging heat between water and a refrigerant, the heat exchanger III 4 is a heat exchanger for exchanging heat between water and gas, and the heat exchanger II 3, the heat exchanger I2, the heat exchanger IV 17 and the heat exchanger III 4 are respectively used for exchanging heat between waste water and waste water, between the waste water and clean hot water, between the waste water and the refrigerant and between the clean water and waste gas of the gas generator set.
The system has two operation modes:
the first mode of operation is: when the temperature of the inlet wastewater of the IC reactor 5 is lower, the outlet wastewater of the IC reactor 5 directly heats the inlet wastewater through a heat exchanger II 3; the biogas generated by the IC reactor 5 is sent to a gas generator set 14 for power generation, the waste heat of the unit flue gas is recovered through an exhaust heat exchanger 11 and a waste heat recovery circulating water device of the gas generator set 14, and the waste heat is used for heating the inlet wastewater passing through a heat exchanger II 3 so as to achieve the optimal temperature range of the IC reactor 5.
The second mode of operation is: when the temperature of the inlet wastewater of the IC reactor 5 is high, the outlet wastewater cannot be directly heated for the inlet wastewater, at the moment, methane enters the gas generator set 14 to generate electricity, the generated electricity is used for driving the compression heat pump system to recover waste heat in the outlet wastewater, indirect heat exchange is adopted in the recovery process, the recovered heat firstly heats the inlet wastewater, then the recovered heat of the gas generator set 14 heats the inlet wastewater through the heat exchanger III 4, the temperature requirement of the IC reactor 5 can be met all the year round, anaerobic bacteria in anaerobic sludge can be guaranteed to treat sewage under high activity, the yield of the methane is increased, and the treatment efficiency is improved.
The foregoing is illustrative of the principles and operation of all processes of the present invention, and any person skilled in the art can modify or change the embodiments described above without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (3)
1. The utility model provides a IC reactor heating system based on gas generating set and compression heat pump which characterized in that: mainly comprises an IC reactor (5), a gas storage tank, a gas generator set (14), a compression heat pump system and a heat exchanger set; the IC reactor (5) introduces inlet wastewater through an inlet wastewater pipe (1) and discharges outlet wastewater through an outlet wastewater pipe (16);
the IC reactor (5) is internally provided with a mixing area (6), the bottom of the mixing area (6) is provided with a water inlet, and granular sludge is also reserved, and the water inlet, the granular sludge and the mud-water mixture reflowed from the gas-liquid separation area of the IC reactor (5) are effectively mixed in the area; a first anaerobic zone (7) is arranged above the mixing zone (6), high-concentration sludge is arranged in the first anaerobic zone (7), most organic matters are converted into methane under the action of the sludge-water mixture after the sludge-water mixture enters the first anaerobic zone (7), the methane is continuously discharged in the form of micro bubbles, the micro bubbles are continuously merged in the ascending process to gradually form larger bubbles, the sludge-water mixture with thinner sludge concentration is formed at the upper part of a sludge layer due to the stirring of the methane, and the sludge-water mixture is lifted to a gas-liquid separation zone (10) at the top by the methane; a second anaerobic zone (8) is arranged above the first anaerobic zone (7), residual wastewater treated by the first anaerobic zone (7) enters the second anaerobic zone (8) through a three-phase separator, the sludge concentration of the second anaerobic zone (8) is low, the methane generation amount is small, the methane is introduced into a gas-liquid separation zone (10) through a methane pipe, the disturbance to the second anaerobic zone (8) is small, the sludge can stay in the zone for a long time, a settling zone (9) is arranged above the second anaerobic zone (8), the settling zone (9) carries out solid-liquid separation on a sludge-water mixture, supernatant is discharged through a water outlet pipe, settled granular sludge returns to a sludge bed of the second anaerobic zone (8), the gas-liquid separation zone (10) is arranged above the settling zone (9), the sludge-water mixture is separated from the methane in the gas-liquid separation zone (10) and is led out of a treatment system, and the sludge-water mixture returns to a mixing zone (6) at the lowest end along a return pipe, the sludge and the inlet water at the bottom of the IC reactor (5) are fully mixed, so that the internal circulation of the mixed liquid is realized; the marsh gas enters a gas storage tank through a pipeline above the IC reactor (5); the bottom of the gas storage tank is provided with an outlet, and the methane is sent to a gas generator set (14) through a pipeline to generate electricity;
the gas generator set (14) comprises a set, an exhaust pipeline (12) and an exhaust heat exchanger (11), and is provided with a waste heat recovery circulating water device, the recovered heat is used for heating the inlet wastewater of the IC reactor (5), and the generated electric quantity is used for driving a compression heat pump system to work;
the compression type heat pump system mainly comprises an evaporator (18), a compressor (15), a throttle valve (19) and a condenser (20), the four devices are connected by pipelines, refrigerants are arranged in the pipelines, and the compression type heat pump system recovers waste heat in the waste water at the outlet of the IC reactor (5) and uses the waste heat to heat the waste water at the inlet of the IC reactor (5);
the heat exchanger group comprises a heat exchanger I (2), a heat exchanger II (3), a heat exchanger III (4) and a heat exchanger IV (17); the heat exchanger I (2) and the heat exchanger III (4) are both arranged on an inlet wastewater pipe (1), the heat exchanger I (2) is connected with the condenser (20), the condenser (20) heats inlet wastewater of the IC reactor (5) through the heat exchanger I (2), the heat exchanger III (4) is connected with the gas generator set (14), heat of the gas generator set (14) heats the inlet wastewater through the heat exchanger III (4), the heat exchanger II (3) is arranged between the inlet wastewater pipe (1) and the outlet wastewater pipe (16), used for heating the outlet wastewater of the IC reactor (5) to the inlet wastewater through the heat exchanger II (3), the heat exchanger IV (17) is arranged on the outlet wastewater pipe (16), the heat exchanger IV (17) is connected with the evaporator (18), and the evaporator (18) indirectly recovers waste heat in the outlet wastewater of the IC reactor (5) through the heat exchanger IV (17);
the system has two modes of operation: the first operation mode is that when the temperature of the inlet wastewater of the IC reactor (5) is lower, the temperature of the outlet wastewater is relatively higher, and the inlet wastewater can be heated by combining the waste heat recovery heat of the gas generator set (14); the second operation mode is that when the temperature of the inlet wastewater of the IC reactor (5) is higher, the gas generator set (14) is combined with the compression heat pump system, and at the moment, the heat of the outlet wastewater recovered by the compression heat pump system, the waste heat of the gas generator set (14) and the heat recovered by the cylinder sleeve heat the inlet wastewater of the IC reactor (5), so that the temperature of the IC reactor (5) can be maintained in an optimal temperature range all year round.
2. The heating system of the IC reactor based on a gas generator set and a compression heat pump according to claim 1, characterized in that the first operating mode is in particular: when the temperature of the inlet wastewater of the IC reactor (5) is lower, the outlet wastewater of the IC reactor (5) directly heats the inlet wastewater through the heat exchanger II (3); the biogas generated by the IC reactor (5) is sent to a gas generator set (14) for power generation, the waste heat of the flue gas of the generator set is recovered through an exhaust heat exchanger (11) and a waste heat recovery circulating water device of the gas generator set (14), and the waste heat is used for heating the inlet wastewater after passing through a heat exchanger II (3).
3. The heating system of the IC reactor based on the gas generator set and the compression heat pump as claimed in claim 1, wherein the second operation mode is specifically as follows: when the temperature of the inlet wastewater of the IC reactor (5) is high, the outlet wastewater cannot be directly heated for the inlet wastewater, at the moment, methane enters the gas generator set (14) to generate electricity, the generated electricity is used for driving the compression heat pump system to recover waste heat in the outlet wastewater, the recovery process adopts indirect heat exchange, the recovered heat firstly heats the inlet wastewater, and then the recovered heat of the gas generator set (14) heats the inlet wastewater through the heat exchanger III (4).
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