Compressor intake air temperature adjustment system and method

Abstract

The present invention discloses a compressor intake air temperature regulation system and method. The present invention realizes two-stage heating of air by setting a first heating liquid supply pipeline, a first heating liquid return pipeline and a second heating pipeline. The on-off of the two-stage heating pipelines can be controlled according to the compressor outlet temperature, so as to effectively realize the compressor intake air temperature regulation of a compressed air energy storage power station, ensure the exhaust temperature of the compressor, the heat storage temperature and the heat storage capacity of the heat storage medium, and meet the requirement that the unit output reaches the rated value during the expansion power generation process.

Description

Technical Field

[0001] The invention relates to a compressor intake air temperature regulating system and method, belonging to the technical field of compressed air energy storage power generation. Background Art

[0002] Compressed air energy storage (CAES) is a type of physical energy storage technology with technical advantages such as low construction cost, no environmental pollution during operation, and long energy storage time. As a voltage stabilizer of the power system, it will play an important role in achieving clean energy consumption and peak shaving and valley filling of the power grid. In the future, it will have broad application prospects in energy storage scenarios on the power supply side, grid side, and user side.

[0003] The compressed air energy storage power generation system mainly stores energy in two forms, compression potential energy and thermal energy, during the compression process. During the expansion power generation process, the high-pressure air in the air storage device is released, and after being heated to a certain temperature by the heat storage medium, it is sent to the expansion generator set to generate electricity.

[0004] In the compressed air energy storage power generation system, the compressor unit usually adopts a multi-stage series operation mode. The last stage generally adopts variable pressure ratio speed regulation to adapt to the pressure change of the gas storage device, while the first and middle stages of the compressor unit generally adopt constant pressure ratio operation, among which the first stage compressor is greatly affected by the ambient temperature. During the operation of the compressor under different seasonal conditions, the intake temperature of the ambient air will directly affect the exhaust temperature of the first stage compressor, and then affect the heat storage temperature and heat storage capacity of the heat storage medium. In the expansion power generation process, it will affect the intake temperature of the expander, thereby affecting the output of the expander.

[0005] The intake air temperature at the design point of the first stage compressor is usually taken as the annual average of the ambient temperature during the off-peak period of electricity consumption; when the compressor is operating under variable conditions, when the actual intake air temperature is higher than the design point, the excess air heat can be taken away by adjusting the flow of the heat storage medium, and it is only necessary to ensure that the heat storage temperature meets the temperature requirements of the heat storage medium during expansion; when the actual intake air temperature is lower than the design point, the exhaust temperature will also be lower than the design point. At this time, the heat storage temperature and heat storage capacity of the heat storage medium will not meet the design point requirements, and the unit can only operate at reduced output during expansion and power generation. In order to ensure that the output of the expander reaches the rated value during variable operating conditions in different seasons, a technology for regulating the intake air temperature of the compressor of a compressed air energy storage power station is urgently needed. Summary of the invention

[0006] The present invention provides a compressor intake air temperature regulation system and method, which solves the problems disclosed in the background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A compressor intake air temperature regulating system comprises an air filtering and heating device, the inlet of the air filtering and heating device is fed with air, the outlet of the air filtering and heating device is externally connected to the inlet of a compressor, the outlet of the compressor is connected to the inlet of a heat flow pipeline of a high-temperature heat exchanger, the outlet of the heat flow pipeline of the high-temperature heat exchanger is connected to the inlet of a heat flow pipeline of a low-temperature cooler, and the outlet of the heat flow pipeline of the low-temperature cooler is connected to an air storage device;

[0009] A second heating pipeline is led out between the compressor and the high-temperature heat exchanger, and the air output from the second heating pipeline is mixed and heated with the air entering the compressor;

[0010] The inlet of the cold flow pipeline of the cryocooler is connected to the outlet of the cooling tower through the heat exchange liquid supply pipeline, and the outlet of the cold flow pipeline of the cryocooler is connected to the inlet of the cooling tower through the heat exchange liquid return pipeline;

[0011] A first heating liquid supply pipeline is led out from the heat exchange liquid return pipeline, the outlet of the first heating liquid supply pipeline is connected to the heating module inlet of the air filter heating device, and the outlet of the heating module is connected to the heat exchange liquid return pipeline through the first heating liquid return pipeline.

[0012] A muffler is also arranged between the air filtering and heating device and the compressor.

[0013] The air output from the second heating pipeline is sprayed into the conical flow channel at the outlet end of the muffler in two ways.

[0014] A first shutoff valve and a first regulating valve are arranged in the second heating pipeline.

[0015] The first connection is located upstream of the second connection, and a throttling device is arranged between the first connection and the second connection; wherein the first connection is the connection between the first heating liquid supply pipeline and the heat exchange return liquid pipeline, and the second connection is the connection between the first heating return liquid pipeline and the heat exchange return liquid pipeline.

[0016] The first heating liquid supply pipeline is provided with a second shut-off valve and a second regulating valve.

[0017] A third shut-off valve and a check valve are arranged on the first heating liquid return pipeline.

[0018] A water supply pump is arranged on the heat exchange liquid supply pipeline.

[0019] The air filtering and heating device also includes a primary filtering module and a fine filtering module. The fine filtering module, the heating module and the primary filtering module are arranged in sequence from top to bottom, and the air passes through the primary filtering module, the heating module and the fine filtering module in sequence.

[0020] A method for regulating the intake air temperature of a compressor, the method being based on the compressor intake air temperature regulating system, comprising:

[0021] If the air temperature at the compressor outlet is higher than threshold value B, the second heating pipeline, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be closed;

[0022] If the air temperature at the compressor outlet is between threshold A and threshold B, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be opened, and the second heating pipeline is closed; wherein threshold A is less than threshold B;

[0023] If the air temperature at the compressor outlet is lower than threshold value A, the second heating pipeline, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be opened.

[0024] The beneficial effects achieved by the present invention are as follows: the present invention realizes two-stage heating of air by setting a first heating liquid supply pipeline, a first heating liquid return pipeline and a second heating pipeline. The on-off of the two-stage heating pipelines can be controlled according to the compressor outlet temperature, thereby effectively realizing the adjustment of the compressor inlet temperature of the compressed air energy storage power station, ensuring the exhaust temperature of the compressor, the heat storage temperature and the heat storage capacity of the heat storage medium, and satisfying the requirement that the unit output reaches the rated value during the expansion power generation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the compressor intake air temperature control system;

[0026] Figure 2 It is a structural schematic diagram of an air filtering and heating device. Implementation

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0028] like Figure 1 As shown, a compressor intake air temperature adjustment system includes an air filtering and heating device 1, a high-temperature heat exchanger 4, a low-temperature cooler 5, an air storage device 6 and a cooling tower 7.

[0029] The air filtering and heating device 1 realizes integrated air filtering and heating. Air is introduced into the inlet of the air filtering and heating device 1. The outlet of the air filtering and heating device 1 is externally connected to the inlet of a compressor 3 (i.e., an air compressor). The outlet of the compressor 3 is connected to the inlet of a high-temperature heat exchanger heat flow pipeline 41. The outlet of the high-temperature heat exchanger heat flow pipeline 41 is connected to the inlet of a low-temperature cooler heat flow pipeline 51. The outlet of the low-temperature cooler heat flow pipeline 51 is connected to the air storage device 6.

[0030] The air filtering and heating device 1 heats and filters the air, which is compressed after entering the compressor 3. The high-temperature compressed air after compression and temperature increase passes through the high-temperature heat exchanger 4 and the low-temperature cooler 5 in turn for cooling, and is then stored in the air storage device 6; wherein, the high-temperature heat exchanger working medium pipeline 42 passes the heat storage working medium, the high-temperature heat exchanger 4 uses hot air to heat the heat storage working medium, and the coolant of the low-temperature cooler 5 generally uses cooling water, which is used to further reduce the air temperature to meet the requirements of the air storage device 6 for the air storage temperature.

[0031] The source of the above-mentioned cooling water is the cooling tower 7. The inlet of the low-temperature cooler cold flow pipeline 52 is connected to the outlet of the cooling tower 7 through the heat exchange liquid supply pipeline C1. A water supply pump 8 is installed on the heat exchange liquid supply pipeline C1 to pump the cooling water to the low-temperature cooler 5. The outlet of the low-temperature cooler cold flow pipeline 52 is connected to the inlet of the cooling tower 7 through the heat exchange liquid return pipeline C2. What flows out of the low-temperature cooler cold flow pipeline 52 is high-temperature cooling water, which flows back to the cooling tower 7 for re-cooling and recycling.

[0032] A first heating liquid supply pipeline A1 is led out from the heat exchange return liquid pipeline C2, and the outlet of the first heating liquid supply pipeline A1 is connected to the inlet of the heating module 102 of the air filtering and heating device 1, and can be the heated air passed into the air filtering and heating device 1. The outlet of the heating module 102 is connected to the heat exchange return liquid pipeline C2 through the first heating liquid return pipeline A2.

[0033] A second heating pipeline B is led out between the compressor 3 and the high-temperature heat exchanger 4. Specifically, the air temperature on the pipeline between the compressor 3 and the high-temperature heat exchanger 4 is the highest. The air output from the second heating pipeline B is mixed and heated with the air entering the compressor 3.

[0034] The above system realizes two-stage heating of air by setting a first heating liquid supply pipeline A1, a first heating liquid return pipeline A2 and a second heating pipeline B. The on-off of the two-stage heating pipelines can be controlled according to the outlet temperature of the compressor 3, so as to effectively realize the inlet temperature adjustment of the compressor 3 of the compressed air energy storage power station, and ensure the exhaust temperature of the compressor 3, the heat storage temperature and the heat storage capacity of the heat storage medium, so as to meet the requirements that the unit output reaches the rated value during the expansion power generation process.

[0035] In order to reduce the noise of air entering the compressor 3, as an embodiment of the present invention, as shown in the figure, a muffler 2 is installed on the pipeline between the air filtering and heating device 1 and the compressor 3, and a conical flow channel is installed at the outlet end of the muffler 2. The air output from the second heating pipeline B is sprayed into the conical flow channel at the outlet end of the muffler 2 in two ways. Specifically, two return air injection interfaces with an angle of 180° can be set on the same circular ring of the conical flow channel, and the return air is sprayed through the return air injection interface, that is, the two return flows are counteracted to enhance the mixed heat exchange effect.

[0036] In order to facilitate the control of the on-off and flow rate of the second heating pipeline B, the first heating liquid supply pipeline A1 and the first heating liquid return pipeline A2, as an embodiment of the present invention, as shown in the figure, a first shut-off valve 14 and a first regulating valve 15 are installed in the second heating pipeline B, the first shut-off valve 14 is located upstream of the first regulating valve 15, a second shut-off valve 10 and a second regulating valve 11 are installed on the first heating liquid supply pipeline A1, the second shut-off valve 10 is located upstream of the second regulating valve 11, a third shut-off valve 12 and a check valve 13 are installed on the first heating liquid return pipeline A2, and the third shut-off valve 12 is located upstream of the check valve 13; wherein, the shut-off valve is used to control the on-off of the pipeline, the regulating valve is used to adjust the pipeline flow, and both are electric regulating valves, and the check valve 13 is used to simulate the liquid reflux in the pipeline; the closing and opening of the second heating pipeline B, the first heating liquid supply pipeline A1 and the first heating liquid return pipeline A2 are interlockedly controlled by the air temperature at the outlet of the compressor 3.

[0037] As an embodiment of the present invention, the connection between the first heating liquid supply pipeline A1 and the heat exchange return liquid pipeline C2 is defined as a first connection, and the connection between the first heating liquid return pipeline A2 and the heat exchange return liquid pipeline C2 is defined as a second connection. The first connection is installed upstream of the second connection, and a throttling device 9 is installed between the first connection and the second connection. The throttling and pressure reduction capacity of the throttling device 9 is consistent with the total pressure drop of the circulating water of the first heating liquid supply pipeline A1, the first heating return liquid pipeline A2, and the heating module 102, ensuring that the return water can be incorporated into the heat exchange return liquid pipeline C2.

[0038] In order to reduce the impurities in the air entering the compressor 3, as an embodiment of the present invention, Figure 2 As shown, the air filtering and heating device 1 in the system adopts two-stage filtration, that is, in addition to the above-mentioned heating module 102, it also includes a primary filtering module 101 and a fine filtering module 103. The fine filtering module 103, the heating module 102 and the primary filtering module 101 are arranged in sequence from top to bottom, and the air passes through the primary filtering module 101, the heating module 102 and the fine filtering module 103 in sequence; wherein, the primary filtering module 101 can filter out coarse particles in the air to prevent the coarse particles from clogging the gaps between the heat exchange tubes of the heating module 102; the heating module 102 can adopt a heating coil, and the heat exchange tube of the heating coil adopts a fin tube type to enhance the heat exchange effect. In other embodiments, the heat exchange tube can also adopt a light tube or other types; the fine filtering module 103 can filter out fine particles in the heated air.

[0039] Based on the same technical solution, the present invention also discloses a method for adjusting the compressor intake air temperature based on the above system, comprising the following steps:

[0040] 1) If the air temperature at the outlet of the compressor 3 is higher than the threshold value B, the second heating pipeline B, the first heating liquid supply pipeline A1 and the first heating liquid return pipeline A2 are controlled to be closed, that is, the first shut-off valve 14, the second shut-off valve 10 and the third shut-off valve 12 are closed;

[0041] 2) If the air temperature at the outlet of the compressor 3 is between the threshold value A and the threshold value B, the first heating liquid supply pipeline A1 and the first heating liquid return pipeline A2 are controlled to be opened, and the second heating pipeline B is closed, that is, the second shut-off valve 10 and the third shut-off valve 12 are opened, and the first shut-off valve 14 is closed, so that only one-stage heating is realized; wherein the threshold value A is less than the threshold value B;

[0042] 3) If the air temperature at the outlet of the compressor 3 is lower than the threshold value A, the second heating pipeline B, the first heating liquid supply pipeline A1 and the first heating liquid return pipeline A2 are controlled to be opened; that is, the first shut-off valve 14, the second shut-off valve 10 and the third shut-off valve 12 are opened at the same time to realize two-stage heating.

[0043] The above thresholds are determined according to the rated exhaust temperature of the compressor 3; if the rated exhaust temperature is 340°C, then threshold A may be 325°C and threshold B may be 335°C; if the rated exhaust temperature is 185°C, then threshold A may be 170°C and threshold B may be 180°C; the specific values ​​may be determined according to actual conditions.

[0044] The present invention controls the on-off of the two-stage heating pipeline according to the outlet temperature of the compressor 3, effectively realizes the inlet temperature adjustment of the compressor 3 of the compressed air energy storage power station, and can ensure the exhaust temperature of the compressor 3, the heat storage temperature and the heat storage capacity of the heat storage medium, so as to meet the rated value requirement of the unit output during the expansion power generation process.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A compressor intake air temperature control system, characterized in that: It comprises an air filtering and heating device, the inlet of the air filtering and heating device is fed with air, the outlet of the air filtering and heating device is externally connected to the inlet of a compressor, the outlet of the compressor is connected to the inlet of a heat flow pipeline of a high-temperature heat exchanger, the outlet of the heat flow pipeline of the high-temperature heat exchanger is connected to the inlet of a heat flow pipeline of a low-temperature cooler, and the outlet of the heat flow pipeline of the low-temperature cooler is connected to an air storage device; A second heating pipeline is led out between the compressor and the high-temperature heat exchanger, and the air output from the second heating pipeline is mixed and heated with the air entering the compressor; The inlet of the cold flow pipeline of the cryocooler is connected to the outlet of the cooling tower through the heat exchange liquid supply pipeline, and the outlet of the cold flow pipeline of the cryocooler is connected to the inlet of the cooling tower through the heat exchange liquid return pipeline; A first heating liquid supply pipeline is led out from the heat exchange liquid return pipeline, the outlet of the first heating liquid supply pipeline is connected to the heating module inlet of the air filter heating device, and the outlet of the heating module is connected to the heat exchange liquid return pipeline through the first heating liquid return pipeline.

2. A compressor intake air temperature control system according to claim 1, characterized in that: A muffler is also arranged between the air filtering and heating device and the compressor.

3. A compressor intake air temperature control system according to claim 2, characterized in that: The air output from the second heating pipeline is sprayed into the conical flow channel at the outlet end of the muffler in two ways.

4. A compressor intake air temperature control system according to claim 1, characterized in that: A first shutoff valve and a first regulating valve are arranged in the second heating pipeline.

5. A compressor intake air temperature control system according to claim 1, characterized in that: The first connection is located upstream of the second connection, and a throttling device is arranged between the first connection and the second connection; wherein the first connection is the connection between the first heating liquid supply pipeline and the heat exchange return liquid pipeline, and the second connection is the connection between the first heating return liquid pipeline and the heat exchange return liquid pipeline.

6. A compressor intake air temperature control system according to claim 1 or 5, characterized in that: The first heating liquid supply pipeline is provided with a second shut-off valve and a second regulating valve.

7. A compressor intake air temperature control system according to claim 1 or 5, characterized in that: A third shut-off valve and a check valve are arranged on the first heating liquid return pipeline.

8. A compressor intake air temperature control system according to claim 1, characterized in that: A water supply pump is arranged on the heat exchange liquid supply pipeline.

9. A compressor intake air temperature control system according to claim 1, characterized in that: The air filtering and heating device also includes a primary filtering module and a fine filtering module. The fine filtering module, the heating module and the primary filtering module are arranged in sequence from top to bottom, and the air passes through the primary filtering module, the heating module and the fine filtering module in sequence.

10. A method for adjusting the intake air temperature of a compressor, characterized in that: The method is based on the compressor intake air temperature control system according to any one of claims 1 to 9, comprising: If the air temperature at the compressor outlet is higher than threshold value B, the second heating pipeline, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be closed; If the air temperature at the compressor outlet is between threshold A and threshold B, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be opened, and the second heating pipeline is closed; wherein threshold A is less than threshold B; If the air temperature at the compressor outlet is lower than threshold value A, the second heating pipeline, the first heating liquid supply pipeline and the first heating liquid return pipeline are controlled to be opened.

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