Compressed air energy storage heat balance system

Abstract

The utility model discloses a compressed air energy storage heat balance system which comprises a cold oil tank and a cold oil circulating pump connected with the cold oil tank, the cold oil circulating pump outputs two pipelines, one pipeline is connected with a heat conduction oil cooler, and the other pipeline is connected with a first oil-gas heat exchanger. The first oil-gas heat exchanger adopts high-temperature compressed air and cold heat conduction oil as heat exchange media, in the standby period of the unit, a cold oil pump is firstly started to start working, secondary low-temperature cold oil in a cold oil tank and low-temperature circulating cooling water are subjected to heat exchange in a heat conduction oil cooler, and the secondary low-temperature cold oil enters the cold oil tank after reaching a low-temperature state; during compression energy storage, secondarily cooled cold conduction oil in the cold oil tank enters the first oil-gas heat exchanger through the cold oil pump to exchange heat with high-temperature compressed air on the gas side of the compressor, the secondarily cooled cold conduction oil can further reduce the temperature on the gas side of the compressor, and the temperature of an inlet and an outlet of the compressor can be prevented from exceeding the limit; therefore, the compression duration, even safe and stable operation of a compressor unit and quick response of an energy storage unit to power grid calling time are ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and specifically relates to a compressed air energy storage heat balance system. BACKGROUND

[0002] The heat storage and energy storage power generation technology is one of the most effective and economic means for solving the problems of abandoned wind and light, realizing waste heat recycling and relieving the peak-valley difference of the power grid. With the expansion of the proportion of new energy, the peak-valley difference of the power grid is increasing, and the regulation capacity of the power grid is seriously insufficient. The heat storage and energy storage power generation technology is one of the most effective and economic means for solving the problems of abandoned wind and light, realizing waste heat recycling and relieving the peak-valley difference of the power grid. In the prior art, the compressed air energy storage utilizes the high-temperature heat storage of the heat conducting oil energy storage power generation system, which has become one of the mainstream compressed air systems, can achieve the purposes of safety of the nitrogen sealing system and environmental protection emission, the low-temperature cold heat conducting oil absorbs the heat generated when the compressed air is absorbed, and the heat is converted into high-temperature hot oil. The low-temperature compressed air is heated by the high-temperature hot oil during power generation, the high-temperature hot oil is converted into low-temperature cold oil, the regeneration and recycling of the heat conducting oil can be realized online, and the stable and safe operation of the heat conducting oil energy storage system is realized. However, the long-term operation of the heat conducting oil system has the following defects and deficiencies:

[0003] 1. In the case of frequent storage and release, the basic temperature of the low-temperature cold heat conducting oil is continuously increased, which affects the storage time and stable operation of the unit

[0004] In the heat conducting oil heat storage and power generation system, because the heat absorption and energy release is a cyclic process, according to the demand for peak and valley regulation of the power grid, the energy storage power station is frequently stored and released every day, and the compressed air energy storage is basically stored and released every day or even twice a day. The low-temperature cold heat conducting oil (or other heat exchange medium) absorbs heat during the energy storage process to become high-temperature heat conducting oil, and then releases heat during the power generation process to become low-temperature heat conducting oil. In order to maintain oil and gas balance, the compressed air energy storage power station currently has a storage time greater than a power generation time, and the compressed air cannot completely absorb the heat generated during the energy storage process from the high-temperature heat conducting oil (or other heat exchange medium) during the power generation process. This will result in that, in the case of frequent storage and release every day, the cold heat conducting oil (or other heat exchange medium) cannot be further cooled in the case that the unit is in a short standby time, the basic temperature of the cold heat conducting oil (or other heat exchange medium) is continuously increased, and then the temperature of the compressed air at the inlet and outlet of the multi-stage series compressor cannot be reduced to the rated temperature through heat exchange of the cold heat conducting oil (or other heat exchange medium) during the energy storage, the temperature at the inlet and outlet of the compressor is out of limit, and thus the storage time is affected and the safe and stable operation of the compressor unit is affected. Therefore, reducing the temperature of the cold heat conducting oil before storage is a technical problem that needs to be solved urgently in the case of frequent calling of the compressed air energy storage power station.

[0005] 2. Cannot be quickly started, and it is difficult to meet the demand for rapid response of the peak regulation of the power grid

[0006] In the current heat conducting oil energy storage system, the outlet temperature of the compression side cannot be quickly reduced to the rated temperature due to the continuously increasing basic temperature of the cold heat conducting oil (or other heat exchange medium). When the unit starts to compress energy storage, the pipeline, oil pump and heat exchanger all need time for temperature drop, and the starting time exceeds the designed starting time, which is difficult to meet the demand of the power grid for rapid response. Practical new type content

[0007] The purpose of the present application is to provide a compressed air energy storage heat balance system to solve the above problems, which is suitable for a compressed air energy storage power generation system, prevents the basic temperature of the low-temperature heat conducting oil (or other heat exchange medium) from being too high, and realizes stable and safe operation of the heat conducting oil energy storage system; the starting time of the energy storage system can be less than 10 minutes, meeting the demand of the power grid for rapid response.

[0008] The above purpose is achieved by the following technical scheme: a compressed air energy storage heat balance system, comprising a cold oil tank and a cold oil circulating pump connected to the cold oil tank, the cold oil circulating pump outputs two pipelines, one of which is connected to a heat conducting oil cooler, and the other is connected to an oil-gas heat exchanger one, the oil-gas heat exchanger one uses high-temperature compressed air and cold heat conducting oil as heat exchange medium.

[0009] As an improvement of the present application, the cold oil circulating pump in the compressed air energy storage heat balance system is provided with three groups of cold oil circulating pump outlet pipelines, the three groups of cold oil circulating pump outlet pipelines are connected to the inlet pipelines of the heat conducting oil cooler and the oil-gas heat exchanger one through the cold oil pipeline outlet pipeline, and the heat conducting oil cooler is connected to the cold oil tank pipeline through the heat conducting oil cooler outlet pipeline.

[0010] As an improvement of the present application, the compressed air energy storage heat balance system further comprises a hot oil tank, the hot oil tank is connected to an oil-gas heat exchanger two through a hot oil circulating pump, and the outlet of the oil-gas heat exchanger two is connected to the cold oil tank pipeline.

[0011] As an improvement of the present application, the end of the oil-gas heat exchanger one is connected to the cold oil tank pipeline.

[0012] As an improvement of the present application, the hot oil circulating pump is provided with three groups of hot oil pump circulating outlet pipelines.

[0013] As an improvement of the present application, the ends of the three groups of hot oil pump circulating outlet pipelines are connected to the oil-gas heat exchanger two through the hot oil to oil-gas heat exchanger two inlet pipeline.

[0014] As an improvement of the present application, the cold oil tank pipeline is connected to the cold oil tank pipeline.

[0015] The utility model discloses a beneficial effect relative to prior art is: the system in compressed air energy storage unit daily standby period, first start the cold oil pump and begin work, and the low temperature cold oil in the cold oil tank is after heat exchange with the circulating cooling water of low temperature in the heat conducting oil cooler, reaches low temperature state, enters the cold oil tank, and the standby condition is finished and enters the energy storage condition work, and the cold heat conducting oil of secondary cooling in the cold oil tank enters the oil -gas heat exchanger one with the high temperature compressed air of compressor gas side and carries out heat exchange, and the cold heat conducting oil of secondary cooling can further reduce the temperature of compressor gas side, can prevent the temperature overrun of compressor import and export, and then guarantee the safe and stable operation of compression even compressor unit and the fast response grid call time of energy storage unit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is compressed air energy storage heat balance system system connection diagram of the utility model.

[0017] The list of figure mark is: 1, cold oil tank, 2, cold oil circulating pump import pipeline, 3, #1 cold oil circulating pump export pipeline, 4, #3 cold oil circulating pump export pipeline, 5, #2 cold oil circulating pump export pipeline, 6, cold oil pipeline export pipeline, 7, heat conducting oil cooler import pipeline, 8, heat conducting oil cooler, 9, heat conducting oil cooler export pipeline, 10, up-to-standard oil to cold oil tank pipeline, 11, up-to-standard oil to cold oil tank pipeline, 12, oil -gas heat exchanger one import pipeline, 13, oil -gas heat exchanger one, 14, hot oil to oil -gas heat exchanger two import pipeline, 15, #1 hot oil circulating pump export pipeline, 16, #3 hot oil pump circulating export pipeline, 17, #2 hot oil circulating pump export pipeline, 18, hot oil circulating pump import pipeline, 19, hot oil tank, 20, up-to-standard oil to hot oil tank pipeline, 21, oil -gas heat exchanger two. DETAILED DESCRIPTION

[0018] The utility model is further illustrated below in conjunction with the drawings and specific embodiment, and should understand that the following specific embodiment is only used for explaining the utility model and is not used for limiting the scope of the utility model.

[0019] Embodiment: as Figure 1 The compressed air energy storage heat balance system includes cold oil tank 1, and the cold oil circulating pump is connected with cold oil tank 1, and the cold oil circulating pump exports two-way pipe, wherein one connects heat conducting oil cooler 8, and the other connects oil -gas heat exchanger one 13, and the oil -gas heat exchanger one 13 uses high temperature compressed air and cold heat conducting oil as heat exchange medium.

[0020] Furthermore, the cold oil circulation pump in the compressed air energy storage heat balance system is provided with three groups of cold oil circulation pump outlet pipes, and the three groups of cold oil circulation pump outlet pipes are connected to the thermal oil cooler inlet pipe 7 and the oil-gas heat exchanger inlet pipe 12 through the cold oil pipe outlet pipe 6, and the thermal oil cooler 8 is connected to the qualified oil to the cold oil tank pipe 10 through the thermal oil cooler outlet pipe 9.

[0021] Furthermore, the compressed air energy storage heat balance system also includes a hot oil tank, which is connected to the oil-gas heat exchanger 2 through a hot oil circulation pump, and the outlet of the oil-gas heat exchanger 2 is connected to the qualified oil to cold oil tank pipeline.

[0022] Furthermore, the end of the oil-gas heat exchanger 1 is connected to the qualified oil to hot oil tank pipeline.

[0023] Furthermore, the hot oil circulation pump is provided with three sets of hot oil pump circulation outlet pipes.

[0024] Furthermore, the ends of the three groups of hot oil pump circulation outlet pipes are connected to the oil-gas heat exchanger 2 through the hot oil to oil-gas heat exchanger 2 inlet pipe.

[0025] Further, the qualified oil to cold oil tank pipeline is connected to the qualified oil to cold oil tank pipeline.

[0026] Normal compressed air energy storage heat exchange method: When the system is storing energy, the cold oil circulation pump starts, pumping the cold thermal oil from the cold oil tank 1 to the cold oil pipeline outlet pipe 6, then to the oil-gas heat exchanger inlet pipe 12, and then to the oil-gas heat exchanger 1 13. In the oil-gas heat exchanger 1, the cold thermal oil exchanges heat with the high-temperature compressed air on the compressor gas side. The heated thermal oil is then directly stored in the hot oil tank through the qualified oil pipeline 20. This process is a normal compressed air energy storage heat exchange process. Because energy storage heat absorption and energy release are a cyclical process, the thermal oil (or other heat exchange medium) cannot fully absorb the heat released during the energy storage process. In the case of frequent grid calls and frequent daily storage and transmission, the low-temperature cold thermal oil (or other heat exchange medium) cannot be further cooled during short unit shutdown and standby time, and the base temperature of the cold thermal oil (or other heat exchange medium) continues to rise.

[0027] Therefore, a compressed air energy storage heat balance system and method are used, which are:

[0028] During the daily non-operating period of the compressed air energy storage, the cold oil circulation pump starts to extract the cold thermal oil in the cold oil tank 1 to the cold oil pipeline outlet pipe 6 and then to the thermal oil cooler inlet pipe 7 to enter the thermal oil cooler 8, and heat exchange is carried out with the low-temperature circulating cooling water in the thermal oil cooler 8. The cooled cold thermal oil is connected to the qualified oil to cold oil tank pipes 10 and 11 through the thermal oil cooler outlet pipe 9 to store the secondary cooled cold thermal oil in the cold oil tank 1.

[0029] It should be noted that the above only illustrates the technical thought of the present application, and cannot limit the protection scope of the present application. For ordinary skilled in the art, without departing from the principle of the present application, some improvements and refinements can be made, and these improvements and refinements fall within the protection scope of the present application.

Claims

1. A compressed air energy storage heat balancing system, characterized in that, The compressed air energy storage heat balance system comprises a cold oil tank (1), a cold oil circulating pump connected with the cold oil tank (1), and the cold oil circulating pump outputs two pipelines, one of which is connected with a heat conducting oil cooler (8), and the other is connected with an oil-gas heat exchanger I (13), and the oil-gas heat exchanger I (13) uses high-temperature compressed air and cold heat conducting oil as heat exchange medium.

2. A compressed air energy storage heat balancing system according to claim 1, wherein, The cold oil circulating pump in the compressed air energy storage heat balance system is provided with three groups of cold oil circulating pump outlet pipelines, the three groups of cold oil circulating pump outlet pipelines are connected with a heat conducting oil cooler inlet pipeline (7) and an oil-gas heat exchanger I inlet pipeline (12) through a cold oil pipeline outlet pipeline (6), and the heat conducting oil cooler (8) is connected with a standard oil to cold oil tank (1) pipeline through a heat conducting oil cooler outlet pipeline.

3. A compressed air energy storage heat balancing system according to claim 1, wherein, The compressed air energy storage heat balance system further comprises a hot oil tank, the hot oil tank is connected with an oil-gas heat exchanger II (21) through a hot oil circulating pump, and an oil-gas heat exchanger II outlet is connected with a standard oil to cold oil tank (1) pipeline.

4. A compressed air energy storage heat balancing system according to claim 1, wherein, The oil-gas heat exchanger I is connected with a standard oil to hot oil tank pipeline at the end.

5. A compressed air energy storage heat balancing system according to claim 3, wherein, The hot oil circulating pump is provided with three groups of hot oil pump circulating outlet pipelines.

6. A compressed air energy storage heat balancing system according to claim 5, wherein, The three groups of hot oil pump circulating outlet pipelines are connected with the oil-gas heat exchanger II (21) through a hot oil to oil-gas heat exchanger II inlet pipeline at the end.

7. A compressed air energy storage heat balancing system according to claim 1, wherein, The standard oil to cold oil tank (1) pipeline is connected with a standard oil to cold oil tank (1) pipeline.

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