System for heating by utilizing compressed air energy storage compression thermal coupling ground source heat pump

Abstract

The utility model discloses a heating system utilizing compressed air energy storage compression thermal coupling ground source heat pump, which belongs to the technical field of compressed air energy storage, and comprises a compressed air energy storage system and a ground source heat pump system, the water side of the steam-water cooler in each compressed air energy storage compression unit is connected with the cooling tower through a cooling water circulation pipeline, and the ground source heat pump system is connected with the cooling water circulation pipeline. According to the compressed air energy storage system, compression heat in the compressed air energy storage process can be stored in the soil in the non-heating season through comprehensive utilization of equipment such as the ground heat exchanger and the ground source heat pump unit arranged in the compressed air energy storage system and pipelines, the cross-seasonal heat storage mode is adopted, the ground source heat pump system is combined, and the energy storage efficiency is improved. The utilization efficiency of waste heat and the energy efficiency of the whole compressed air energy storage system are improved while heating is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressed air energy storage, and in particular relates to a system for heating by utilizing compressed air energy storage, compressed heat, and coupled ground source heat pump. Background Art

[0002] In recent years, new energy storage technologies such as compressed air have developed and been applied rapidly. Compressed air energy storage is an environmentally friendly energy source that can improve the local environment to a certain extent and has good environmental benefits.

[0003] In general large-capacity non-supplementary advanced adiabatic compressed air systems, a large amount of compression heat is generated during the compression process of the compressor. This part of the heat is usually released directly through the cooling tower. If it is not used, it will cause a waste of this part of the heat. At present, in order to avoid energy waste and reduce the consumption of other energy sources, many compressed air energy storage plants are considering using this part of the compression heat for heating. However, since the compression process of the compressed air energy storage process is not continuous and the generation of compression heat is not continuous, it is usually only used as a backup heat source, and electric boilers and other equipment are still used mainly for heating. Soil, as a natural heat storage body, can realize short-term and long-term storage of heat. Combined with the ground source heat pump system, it can solve the problem of discontinuous heating source and reduce the capacity of the cooling tower in the system.

[0004] Therefore, considering the specific situation that a large amount of compression heat is generated in the current compressed air energy storage power station, it is necessary to develop a system that uses compressed air energy storage compression heat coupled with ground source heat pump heating. Utility Model Content

[0005] The purpose of the utility model is to provide a system for heating by utilizing compressed air energy storage compressed heat coupled with a ground source heat pump, utilizing the waste heat generated by the compressor in the compressed air energy storage process in combination with geothermal wells, ground source heat pumps, etc. to provide heating hot water to the factory area or outside the factory area, so as to improve the energy efficiency of the compressed air energy storage system, reduce the capacity of the cooling tower equipment in the system, improve energy utilization efficiency, reduce operating costs, and reduce the consumption of non-renewable energy.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A system for heating by utilizing compressed air energy storage compression heat coupled to a ground source heat pump comprises a compressed air energy storage system and a ground source heat pump system. The compressed air energy storage system comprises N-stage compressed air energy storage compression units. The water side of the steam-water cooler in each compressed air energy storage compression unit is connected to a cooling tower via a cooling water circulation pipeline, and the ground source heat pump system is connected to the cooling water circulation pipeline.

[0008] A further improvement of the technical solution of the utility model is that the ground source heat pump system includes a connected buried pipe heat exchanger and a ground source heat pump unit, and the heating system and the ground source heat pump unit are connected through a heating water supply pipe and a heating return pipe.

[0009] A further improvement of the technical solution of the utility model is that: N≥2, the N-1th compressed air energy storage compression unit includes a compressor, an oil-gas cooler, a steam-water cooler and a gas-liquid separator connected in series, the Nth compressed air energy storage compression unit includes a compressor and a steam-water cooler, and the steam-water cooler of the Nth compressed air energy storage compression unit is connected to the air storage reservoir.

[0010] A further improvement of the technical solution of the utility model is that valves V6 and valve V5 are respectively provided on the cooling water inlet pipe and cooling water return pipe of the cooling water circulation pipeline connecting the cooling tower and the N steam-water coolers of the compressed air energy storage compression unit.

[0011] A further improvement of the technical solution of the utility model is that a valve V1 is set on the geothermal water return pipe connecting the geothermal heat pump unit of the geothermal heat pump system and the buried pipe heat exchanger, and a valve V2 is set on the geothermal water supply pipe connecting the buried pipe heat exchanger and the geothermal heat pump unit.

[0012] A further improvement of the technical solution of the utility model is that a water inlet branch pipe is provided on the geothermal water supply pipeline connected to the ground source heat pump unit of the ground source heat pump system and the buried pipe heat exchanger, and is connected to the cooling water outlet pipe of the cooling water circulation pipeline, and a valve V4 is provided on the water inlet branch pipe; a water return branch pipe is provided on the geothermal water return pipe connected to the buried pipe heat exchanger and the ground source heat pump unit, and is connected to the cooling water return pipe of the cooling water circulation pipeline, and a valve V3 is provided on the return branch pipe.

[0013] A further improvement of the technical solution of the utility model is that the cooling water return pipe is connected to the water inlet branch pipe, and the cooling water inlet pipe is connected to the water return branch pipe.

[0014] A further improvement of the technical solution of the utility model is that the oil-gas cooler of the compressed air energy storage compression unit is connected to the oil tank.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0016] The present application can realize the storage of compression heat in the compressed air energy storage process in the soil during the non-heating season through the comprehensive utilization of equipment and pipelines such as buried pipe heat exchangers and ground source heat pump units set in the compressed air energy storage system.

[0017] This application uses the earth's soil as a natural cooling tower to meet the requirements of heat dissipation and cooling of the air cooler in the compressed air energy storage system. It reduces the capacity of the natural ventilation cooling tower and reduces the power consumption of the cooling water pump.

[0018] This application adopts a cross-seasonal heat storage method, combined with a ground source heat pump system, which not only achieves heating but also improves the utilization efficiency of waste heat and the energy efficiency of the entire compressed air energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump in the utility model;

[0020] Among them, 1. compressor, 2. oil-gas cooler, 3. steam-water cooler, 4. gas-liquid separator, 5. return branch pipe, 6. inlet branch pipe, 7. buried pipe heat exchanger, 8. ground source heat pump unit, 9. cooling tower, 10. cooling water circulation pipeline. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the embodiments:

[0022] like Figure 1 As shown, a system for heating by using compressed air energy storage compression heat coupled with a ground source heat pump includes a compressed air energy storage system and a ground source heat pump system. The compressed air energy storage system includes N-stage compressed air energy storage compression units, N≥2, the N-1th compressed air energy storage compression unit includes a compressor 1, an oil and gas cooler 2, a steam-water cooler 3 and a gas-liquid separator 4 connected in series, the Nth compressed air energy storage compression unit includes a compressor 1 and a steam-water cooler 3, and the steam-water cooler of the Nth compressed air energy storage compression unit is connected to the gas storage reservoir. The steam-water cooler 3 in each compressed air energy storage compression unit is connected to the cooling water circulation pipeline 10 through a pipeline and then connected to the cooling tower 9.

[0023] The ground source heat pump system includes a connected underground heat exchanger 7 and a ground source heat pump unit 8, and the heating system and the ground source heat pump unit 8 are connected through a heating water supply pipe and a heating return pipe. The ground source heat pump system is connected to a cooling water circulation pipeline 10.

[0024] The cooling water outlet pipe and the cooling water return pipe of the cooling water circulation pipeline 10 connected to the cooling tower 9 and the N coolers 3 of the compressed air energy storage compression unit are provided with valves V6 and V5, respectively. The geothermal water return pipe connected to the ground source heat pump unit 8 of the ground source heat pump system and the underground pipe heat exchanger 7 is provided with valve V1, and the geothermal water inlet pipe connected to the underground pipe heat exchanger 7 and the ground source heat pump unit 8 is provided with valve V2. The geothermal water inlet pipe connected to the ground source heat pump unit 8 of the ground source heat pump system and the underground pipe heat exchanger 7 is provided with an inlet branch pipe 6 connected to the cooling water outlet pipe of the cooling water circulation pipeline, and a valve V4 is provided on the inlet branch pipe 6, and the geothermal water return pipe connected to the underground pipe heat exchanger 7 and the ground source heat pump unit 8 is provided with a return branch pipe 5 connected to the cooling water return pipe of the cooling water circulation pipeline, and a valve V3 is provided on the return branch pipe 5. The cooling water return pipe is connected to the water inlet branch pipe 6, and the cooling water inlet pipe is connected to the water return branch pipe 5. The oil-gas cooler 2 of the compressed air energy storage compression unit is connected to the oil tank.

[0025] Working principle:

[0026] The specific pipe connection method and operation mode of the system using compressed air energy storage compression heat coupled ground source heat pump heating are as follows:

[0027] Depending on the size of the compressed air energy storage system, there is generally an X-hour compression period in a day. During this period, the compressor-related process works and a large amount of compression heat is generated. When the compressed air energy storage system is in the compression stage, the coolers at all levels will replace the compression heat generated by the compressor in the form of hot water. This part of the hot water is the waste hot water of the system. Depending on the working conditions, the temperature of the waste hot water is usually around 38°C, and the return water temperature required by the system is about 28°C.

[0028] In the non-heating season, waste hot water can be stored in the soil through the buried heat exchanger, and the excess heat can be released through the cooling tower. In the heating season, when the compressed air energy storage process system is in the compression stage, the waste hot water can be directly used for heating through the ground source heat pump unit, and the excess heat can be released through the cooling tower; when the compressed air energy storage process system is in the non-compression stage, the heat stored in the soil in the non-heating season can be used for heating through the ground source heat pump unit.

[0029] In the non-heating season, when the compressed air energy storage system is in the compression process operation period, waste hot water can be used to generate heat. At this time, valves V3 and V4 are opened, and valves V1, V2, V5, and V6 are closed. The waste hot water enters the buried pipe heat exchanger 7 to exchange heat with the soil and stores the heat in the soil. When the heat generated in the system is greater than the storage capacity of the soil, valves V5 and V6 are opened, and the excess heat is released through the cooling tower 9.

[0030] In the heating season, when the compressed air energy storage system is in the compression stage, valves V3 and V4 are opened, valves V1, V2, V5, and V6 are closed, and the waste hot water is heated by the ground source heat pump unit 8. When the heat generated by the system is more than the heat required at the heating end, valves V5 and V6 are opened, and the excess heat is released through the cooling tower 9; when the compressed air energy storage system is in the non-compression stage, valves V1 and V2 are opened, valves V3, V4, V5, and V6 are closed, and the heat stored in the soil in the non-heating season is used for heating through the ground source heat pump unit.

Claims

1. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump, characterized in that: The invention comprises a compressed air energy storage system and a ground source heat pump system. The compressed air energy storage system comprises N-stage compressed air energy storage compression units. The water side of the steam-water cooler (3) in each compressed air energy storage compression unit is connected to a cooling tower (9) via a cooling water circulation pipeline (10), and the ground source heat pump system is connected to the cooling water circulation pipeline (10).

2. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 1, characterized in that: The ground source heat pump system comprises a connected buried pipe heat exchanger (7) and a ground source heat pump unit (8); the heating system and the ground source heat pump unit (8) are connected via a heating water supply pipe and a heating water return pipe.

3. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 1, characterized in that: N≥2, the N-1th compressed air energy storage compression unit includes a compressor (1), an oil-gas cooler (2), a steam-water cooler (3) and a gas-liquid separator (4) connected in series, the Nth compressed air energy storage compression unit includes a compressor (1) and a steam-water cooler (3), and the steam-water cooler of the Nth compressed air energy storage compression unit is connected to a gas storage reservoir.

4. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 3, characterized in that: A valve V6 and a valve V5 are respectively provided on the cooling water inlet pipe and the cooling water return pipe of the cooling water circulation pipeline (10) connecting the cooling tower (9) and the N steam-water coolers (3) of the compressed air energy storage compression unit.

5. The system for heating by using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 2, characterized in that: A valve V1 is provided on the geothermal water return pipe connecting the geothermal heat pump unit (8) of the geothermal heat pump system and the buried pipe heat exchanger (7), and a valve V2 is provided on the geothermal water supply pipe connecting the buried pipe heat exchanger (7) and the geothermal heat pump unit (8).

6. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 5, characterized in that: A water inlet branch pipe (6) is provided on the geothermal water supply pipeline connecting the geothermal heat pump unit (8) of the geothermal heat pump system to the underground pipe heat exchanger (7) and connected to the water outlet pipe of the cooling water circulation pipeline, and a valve V4 is provided on the water inlet branch pipe (6). A water return branch pipe (5) is provided on the geothermal water return pipe connecting the underground pipe heat exchanger (7) to the geothermal heat pump unit (8) and connected to the water return pipe of the cooling water circulation pipeline, and a valve V3 is provided on the water return branch pipe (5).

7. A system for heating using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 6, characterized in that: The cooling water return pipe is connected to the water inlet branch pipe (6), and the cooling water inlet and return branch pipes (5) are connected.

8. The system for heating by using compressed air energy storage and compressed heat coupled to a ground source heat pump according to claim 3, characterized in that: The oil-gas cooler (2) of the compressed air energy storage compression unit is connected to the oil tank.

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