CN210801685U - A combined cooling, heating and power supply system for biogas combined cycle - Google Patents

Abstract

The utility model discloses a combined cycle cooling, heating and power supply system of biogas, which comprises a biogas power generation system, an absorption refrigeration system and a heating system. The biogas power generation system comprises a biogas tank, a biogas purification device, an internal combustion engine, a generator and a cylinder connected in sequence. jacket water heat exchanger; absorption refrigeration system includes generator, condenser, evaporator and absorber; heating system includes flue gas hot water heat exchanger and hot water storage tank, the outer wall of the biogas tank is wound with water pipes, and the internal combustion engine The water outlet of the cylinder jacket is connected to the inlet of the water pipe through the regulating valve; the flue gas outlet of the internal combustion engine is respectively connected to the generator and the flue gas hot water heat exchanger, the generator is connected to the electricity end, the evaporator is connected to the refrigeration end, The condenser is connected to the domestic hot water terminal, and the hot water storage tank is respectively connected to the heating terminal and the domestic hot water terminal. On the basis of recycling and utilizing biogas, the utility model is combined with a combined cooling, heating and power supply system to effectively solve the energy self-sufficiency in areas with abundant biomass energy.

Description

A combined cooling, heating and power supply system for biogas combined cycle

technical field

The utility model relates to the technical field of clean energy utilization, in particular to a combined cycle cooling, heating and power supply system of biogas.

Background technique

Based on the cascade utilization of energy, combined cooling, heating and power (CCHP) is an important way to achieve efficient energy utilization. Rural areas are rich in biomass energy resources, thus promoting the development of biogas projects can not only efficiently recycle organic wastes, but also alleviate the problem of rural environmental pollution. The existing combined cooling, heating and power system using biogas or biomass is relatively complex, the initial investment of the system is high, the energy utilization rate is low, and the heat and cooling capacity provided by the system cannot match the cooling capacity and heat required by the building. When the load demand is high, the stability of energy supply is difficult to guarantee, the system adjustment is not flexible, and the energy supply method is single, and the energy supply cost is high, which is not conducive to reflecting the energy saving and economy of the system. At the same time, when the fermentation temperature in the biogas tank is low, the output of biogas cannot meet the demand for power generation, which will greatly reduce the efficiency of the system.

Utility model content

In order to solve the above problems, on the basis of recycling and utilizing biogas, the utility model combines it with a combined cooling, heating and power supply system to establish a combined cooling, heating and power supply system with a combined cycle of biogas, which effectively solves the problems in areas with abundant biomass energy. Energy self-sufficiency.

In order to realize the above-mentioned technical purpose, the utility model adopts the following technical solutions:

A combined cooling, heating and power supply system of biogas combined cycle includes a biogas power generation system, an absorption refrigeration system and a heating system. The biogas power generation system includes a biogas tank, a biogas purification device, an internal combustion engine and a generator connected in sequence; the absorption refrigeration system includes Generator, condenser, evaporator and absorber; the heating system includes a flue gas hot water heat exchanger and a hot water storage tank, the outer wall of the biogas tank is wound with a water pipe, and the cylinder jacket water outlet of the internal combustion engine is connected to the water pipe through a regulating valve The biogas power generation system further includes a cylinder jacket water heat exchanger, the cylinder jacket water heat exchanger has a first inlet, a first outlet, a second inlet and a second outlet, and the first inlet is connected to the water pipe The first outlet is connected to the cylinder jacket water inlet of the internal combustion engine; the second inlet is connected to normal temperature water, and the second outlet is connected to the absorber and the flue gas hot water heat exchanger respectively; the flue gas outlet of the internal combustion engine is connected to the To the generator and the flue gas hot water heat exchanger, the generator is connected to the electricity end, the evaporator is connected to the cooling end, the condenser is connected to the domestic hot water end, and the hot water storage tank is respectively connected to the heating end and the domestic hot water end .

As one of the preferred solutions of the present invention, the internal combustion engine is also connected to a gas pipeline, and the biogas and the gas jointly drive the internal combustion engine to work.

As one of the preferred solutions of the present invention, the biogas tank is provided with a temperature sensor, and the opening degree of the regulating valve is determined by the detection value of the temperature sensor.

As one of the preferred solutions of the present invention, the flue gas outlet of the internal combustion engine is respectively connected to the generator through the first valve, and is connected to the flue gas hot water heat exchanger through the fourth valve, and the generator and the flue gas hot water exchange heat. The flue gas outlet of the device is equipped with a flue gas purification device.

As one of the preferred solutions of the present invention, the second outlet of the jacket water heat exchanger is connected to the absorber through a second valve, and is connected to the flue gas hot water heat exchanger through a third valve, respectively. The water outlet is connected to the condenser, and the hot water outlet of the condenser is connected to the end of the domestic hot water; the hot water outlet of the flue gas hot water heat exchanger is connected to the hot water storage tank.

As one of the preferred solutions of the present invention, the hot water storage tank is connected to the heating terminal through the fifth valve through the water pump, and is connected to the flue gas hot water heat exchanger through the sixth valve, and the outlet of the heating terminal passes through the seventh valve. Connect to flue gas hot water heat exchanger.

As one of the preferred solutions of the present invention, the hot water storage tank is further provided with a second hot water outlet, and the second hot water outlet is connected to the end of the domestic hot water.

As one of the preferred solutions of the present invention, the generator is also connected with a battery.

As one of the preferred solutions of the present invention,

Compared with the prior art, the present invention has at least the following beneficial effects:

The biogas combined with natural gas is used to drive the internal combustion engine to generate electricity. At the same time, the heat of the flue gas of the internal combustion engine and the heat of the cylinder jacket water drive the absorption refrigeration system and heating system to provide cooling, heating and domestic hot water for users, realizing combined cooling, heating and power, and the system efficiency is high . At the same time, the heat of the cylinder jacket water of the internal combustion engine is used to heat the biogas tank, so that the biogas tank is at a suitable fermentation temperature, which ensures the supply of biogas. The water after heating the biogas tank further passes through the cylinder jacket water heat exchanger, flue gas-water Heat exchanger or absorber heating, providing domestic hot water and heating water, improving energy efficiency.

Description of drawings

Fig. 1 is the schematic flow chart of the system described in the utility model;

Fig. 2 is the schematic flow chart of the system of the utility model in the summer of combined cooling, heating and power supply;

FIG. 3 is a schematic flow chart of the combined cooling, heating and power supply of the system according to the present invention in winter.

In the picture: 1. Biogas tank, 2. Biogas purification device, 3. Internal combustion engine, 4. Control valve, 5. Generator, 6. Battery, 7. Cylinder jacket water heat exchanger, 8. Generator, 9. Condenser , 10, expansion valve, 11, evaporator, 12, absorber, 14, solution heat exchanger, 15, first valve, 16, first flue gas purification device, 17, flue gas hot water heat exchanger, 18, Hot water storage tank, 19, water pump, 20, radiator, 21, second flue gas purification device, 22, second valve, 23, third valve, 24, fourth valve, 25, fifth valve, 26, first valve Six valves, 27, seventh valve.

Detailed ways

The present invention will be further explained below in conjunction with the specific embodiments. The embodiments of the present invention are for the purpose of enabling those skilled in the art to better understand the present invention, and do not limit the present invention.

As shown in Figure 1, the combined cooling, heating and power supply system of the biogas combined cycle of the present invention includes a biogas power generation system, an absorption refrigeration system and a heating system, and the biogas power generation system includes a biogas tank 1, a biogas purification device 2, Internal combustion engine 3 and generator 5; absorption refrigeration system includes generator 8, condenser 9, evaporator 11 and absorber 12; heating system includes flue gas hot water heat exchanger 17 and hot water storage tank 18.

The biogas tank 1 is connected to the inlet of the biogas purification device 2 through a pipeline to remove impurities contained in the biogas; the outlet of the biogas purification device 2 is connected to the first inlet of the internal combustion engine 3 through a pipeline, and the generated high temperature and high pressure circulating working medium expands and outputs kinetic energy Natural gas is connected with the second inlet of the internal combustion engine 3 through a pipeline to supplement insufficient fuel; the second outlet of the internal combustion engine 3 is connected with the generator through a linkage shaft, and the kinetic energy output by the internal combustion engine 3 is transmitted to the generator 5, so The generator 5 converts it into electrical energy and provides it to the user; the generator 5 is also connected to the battery 6 , and the excess electricity generated is stored in the battery 6 .

The cylinder jacket water outlet generated by the internal combustion engine 3 is connected to the inlet of the water pipe laid around the biogas tank through a pipeline equipped with a regulating valve 4. After the biogas tank 3 absorbs heat, the cooled cylinder jacket water flows through the cylinder jacket water for heat exchange. The first inlet of the device 7 preheats the normal temperature water, and then returns to the cylinder jacket water inlet of the internal combustion engine 3 to maintain the biogas tank 3 at a suitable fermentation temperature.

A temperature sensor is installed at the bottom of the biogas tank 3, the regulating valve 4 is installed on the inlet side of the cylinder jacket water, the input end of the controller is connected with the temperature sensor, and the output end of the controller is connected with the regulating valve 4, according to the detection of the temperature sensor. value, control the opening of the regulating valve 4 to meet the actual working conditions.

The flue gas outlet of the internal combustion engine 3 is connected to the first inlet of the generator 8 through the first valve 15 through the pipeline, and after the high temperature flue gas heat is transferred to the circulating working medium in the generator 8, the first flue gas is purified. The device 16 is discharged; the second inlet of the generator 8 is connected to the condenser 9 through a pipeline, and the refrigerant vapor vaporized by the absorbed heat in the generator 8 enters the condenser 9 and is liquefied; the outlet of the condenser 9 is connected to the expansion valve The inlet of 10 is connected, and the liquid refrigerant is depressurized and cooled by the expansion valve; the outlet of the expansion valve 10 is connected with the inlet of the evaporator 11, and the liquid refrigerant is vaporized in the evaporator 11 to absorb indoor heat to produce a cooling effect; the generator 8 has a cooling effect. The outlet of the concentrated absorbent solution flows through the first inlet of the solution heat exchanger 14 into the absorber 12, and the concentrated absorbent solution continuously absorbs the refrigerant vapor from the evaporator 11 in the absorber 12 to form a binary solution , and then flows to the second inlet of the solution heat exchanger through the working fluid pump to absorb the heat of the concentrated absorbent solution, and then returns to the generator 8 to complete the flue gas absorption refrigeration cycle.

The flue gas outlet of the internal combustion engine 3 is connected to the first inlet of the flue gas hot water heat exchanger 17 through the fourth valve 24 through a pipeline, and transfers the heat of the high temperature flue gas to the flue gas hot water heat exchanger 17 After the circulating working fluid is discharged, it is discharged through the second flue gas purification device 21; the second outlet of the flue gas hot water heat exchanger 17 is connected to the hot water storage tank 18 through a pipeline, and the circulating working fluid is heated after absorbing the heat of the high temperature flue gas. The high-quality water enters the hot water storage tank 18, and the second hot water outlet of the hot water storage tank 18 is opened to supply domestic hot water; the outlet of the hot water storage tank 18 transports the hot water to the Heating the user side, and then returning to the flue gas hot water heat exchanger 17 to complete the heating cycle.

The normal temperature water pipe first absorbs the heat of the cylinder jacket water return water through the second inlet of the cylinder jacket water heat exchanger 7, and then flows through the absorber 12 and the condenser 9 in turn through the second valve 22, and the normal temperature water absorbs the heat. After the temperature rises, domestic hot water is supplied to the user; the normal temperature water pipeline enters the heating circulation pipeline through the third valve 23 to supplement the lost circulating water for the heating cycle.

In actual operation, the specific process of the system described in this embodiment is as follows:

The biogas tank 1 is used to collect livestock manure and ferment it to produce biogas, and the biogas enters the biogas purification device 2 through the pipeline. When the amount of biogas generated is sufficient, the purified biogas drives the gas-fired internal combustion engine 3 to generate power, and drives the generator 5 to generate electricity for the user. Provide electricity, and the excess electricity is stored by the battery 6; when the amount of biogas generated is insufficient, the natural gas supplementary combustion is turned on, and the purified biogas and natural gas together drive the internal combustion engine 3 to generate power, and drive the generator 5 to generate electricity. During this process, the cylinder jacket water generated by the internal combustion engine 3 enters the water pipe arranged around the biogas tank 1 through the regulating valve 4 to maintain the temperature of the biogas tank and increase the biogas production. The cylinder jacket water after heat exchange with the biogas tank flows out of the biogas tank and enters the biogas tank. After the cylinder jacket water heat exchanger 7 is cooled down, it returns to the internal combustion engine 3 to complete the cylinder jacket water cycle.

As shown in FIG. 2 , under the summer operating conditions, the first valve 15 is opened and the fourth valve 24 is closed, and the high-temperature flue gas generated by the internal combustion engine 3 enters the generator 8 through the first valve 15, and the heat-exchanged flue gas passes through the first flue gas. The gas purification device 16 is discharged after purification. After the refrigerant-absorbent solution in the generator 8 absorbs the waste heat of the high-temperature flue gas, the refrigerant with a low boiling point is vaporized and separated from the absorbent, and then the refrigerant vapor enters the condenser 9 to be liquefied, and the liquid refrigerant passes through the expansion valve 10. Decompression and cooling enter the evaporator 11, vaporize in the evaporator 11, and absorb the indoor heat to produce a refrigeration effect; the concentrated absorbent solution after being separated from the refrigerant flows through the solution heat exchanger 14 and enters the absorber 12. The refrigerant vapor in the generator 11 forms a refrigerant-absorbent solution. After being boosted by the solution pump 13, it first enters the solution heat exchanger 14 to absorb the heat of the concentrated solution and then returns to the generator to complete the heat exchanger with heat exchanger. Absorption refrigeration cycle.

The normal temperature water is heated once through the jacket water heat exchanger 7, opens the second valve 22, enters the absorber 12 and the condenser 9 in sequence, and finally flows out to provide domestic hot water.

As shown in FIG. 3 , under the winter operating conditions, the first valve 15 is closed and the fourth valve 24 is opened, and the high-temperature flue gas generated by the internal combustion engine 3 enters the fourth valve 24 and enters the flue gas hot water heat exchanger 17 . The flue gas is purified and discharged by the second flue gas purification device 21 . After the heat transfer medium water absorbs the heat of the high-temperature flue gas in the flue gas hot water heat exchanger 17, the temperature rises and enters the hot water storage tank 18, the fifth valve 25 and the seventh valve 27 are opened, and the hot water is pumped by the water pump 19. The radiator 20 sent to the room is heated, and then returned to the flue gas hot water heat exchanger 17 to complete the heating cycle.

The normal temperature water is heated up once through the liner water heat exchanger 7, the third valve 23 is opened, and it enters the flue gas hot water heat exchanger in turn to absorb the heat of the high temperature flue gas, and enters the hot water storage tank. The hot water outlet provides domestic hot water to the end of the domestic hot water.

In the transitional season, the system closes the first valve 15, the second valve 22, the fifth valve 25 and the seventh valve 27, and opens the third valve 23, the fourth valve 24 and the sixth valve 26 while supplying power. The hot water storage tank 18 is provided with hot water to provide domestic hot water for users.

It can be seen that the utility model uses the biogas combined with the natural gas to drive the internal combustion engine to generate electricity, and simultaneously the flue gas heat of the internal combustion engine and the heat of the cylinder jacket water drive the absorption refrigeration system and the heating system to supply cooling, heating and domestic hot water for users, so as to realize the combined supply of cold, heat and power. , the system efficiency is higher. At the same time, the heat of the cylinder jacket water of the internal combustion engine is used to heat the biogas tank, so that the biogas tank is at a suitable fermentation temperature, which ensures the supply of biogas. The water after heating the biogas tank further passes through the cylinder jacket water heat exchanger, flue gas-water Heat exchanger or absorber heating, providing domestic hot water and heating water, improving energy efficiency.

The above is not intended to limit the present utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the present utility model. The scope defined by the new claims shall prevail.

Claims (8)

1. A combined cooling heating and power system with biogas combined cycle comprises a biogas power generation system, an absorption refrigeration system and a heating system, wherein the biogas power generation system comprises a biogas tank, a biogas purification device, an internal combustion engine and a generator which are connected in sequence; the absorption refrigeration system comprises a generator, a condenser, an evaporator and an absorber; heating system includes flue gas hot water heat exchanger and heat storage water tank, its characterized in that:

a water pipe is wound on the outer wall of the methane tank, a cylinder sleeve water outlet of the internal combustion engine is connected to an inlet of the water pipe through a regulating valve,

the methane power generation system also comprises a cylinder sleeve water heat exchanger which is provided with a first inlet, a first outlet, a second inlet and a second outlet,

the first inlet is connected to the outlet of the water pipe, and the first outlet is connected to a cylinder liner water inlet of the internal combustion engine;

the second inlet is connected with normal-temperature water, and the second outlet is respectively connected with the absorber and the flue gas hot water heat exchanger;

the smoke outlet of the internal combustion engine is respectively connected with the generator and the smoke hot water heat exchanger,

the generator is connected to the power consumption end, and the evaporimeter is connected to the refrigeration end, and the condenser is connected to life hot water end, and the hot water storage tank is connected to heating end and life hot water end respectively.

2. A combined cooling, heating and power system for biogas combined cycle according to claim 1, wherein: the internal combustion engine is also connected with a gas pipeline, and the methane and the gas drive the internal combustion engine to work together.

3. A combined cooling, heating and power system for biogas combined cycle according to claim 2, wherein: a temperature sensor is arranged in the methane tank, and the opening degree of the regulating valve is determined by the detection value of the temperature sensor.

4. A combined cooling, heating and power system for biogas combined cycle according to claim 3, wherein: the smoke outlet of the internal combustion engine is connected to the generator through the first valve and connected to the smoke hot water heat exchanger through the fourth valve, and smoke purifying devices are arranged at the smoke outlets of the generator and the smoke hot water heat exchanger.

5. The combined cooling, heating and power system of biogas combined cycle according to claim 4, wherein: a second outlet of the cylinder sleeve water heat exchanger is respectively connected to the absorber through a second valve and connected to the flue gas hot water heat exchanger through a third valve,

a hot water outlet of the absorber is connected to a condenser, and a hot water outlet of the condenser is connected to the end of domestic hot water; and a hot water outlet of the flue gas hot water heat exchanger is connected to the heat storage water tank.

6. A combined cooling, heating and power system for biogas combined cycle according to claim 5, wherein: the heat storage water tank is connected to the heating end through a fifth valve and a sixth valve respectively through a water pump, and the outlet of the heating end is connected to the flue gas hot water heat exchanger through a seventh valve.

7. A combined cooling, heating and power system for biogas combined cycle according to claim 6, wherein: the heat storage water tank is also provided with a second hot water outlet which is connected to the end of the domestic hot water.

8. A combined cooling, heating and power system for biogas combined cycle according to claim 1, wherein: the generator is also connected with a storage battery.

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