CN220036744U - Compressed air energy storage device and power grid regulation and control system - Google Patents
Compressed air energy storage device and power grid regulation and control system Download PDFInfo
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- CN220036744U CN220036744U CN202320903532.0U CN202320903532U CN220036744U CN 220036744 U CN220036744 U CN 220036744U CN 202320903532 U CN202320903532 U CN 202320903532U CN 220036744 U CN220036744 U CN 220036744U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 67
- 230000033228 biological regulation Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 288
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003750 conditioning effect Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The utility model relates to a compressed air energy storage device and a power grid regulation and control system. The compressed air energy storage device also comprises a water separator and a first adjusting module; the water inlet of the water separator is communicated with the water outlet of the water pump, and the water outlet of the water separator is communicated with the waterway inlets of all the interstage heat exchangers on the compressor/expander; the first adjusting module is used for monitoring the water pressure of the water separator and adjusting the frequency of the water pump based on the water pressure. When the parameters of the on/off compressor or the power grid regulation system change, the liquid level of the first medium tank and the liquid level of the second medium tank and the running state of the compressor/expander change, so that the water channel inlet pressure of the inter-stage heat exchanger on the compressor fluctuates, at the moment, the first regulation module can rapidly monitor the water pressure of the water separator to correspondingly change, and then the frequency of the water pump is regulated according to the water pressure of the water separator so as to stabilize the water channel inlet pressure of the inter-stage heat exchanger, thereby improving the running stability of the whole compressed air energy storage device.
Description
Technical Field
The utility model relates to the technical field of energy storage and power generation, in particular to a compressed air energy storage device and a power grid regulation and control system.
Background
The compressed air energy storage device is used as a device for instantly storing energy by using compressed air and releasing the energy when needed, and can be applied to the field of electric energy storage so as to realize large-capacity and long-time electric energy storage. Among them, the compressed air energy storage device generally has a compressed air energy storage process and a compressed air energy release process. In the compressed air energy storage process, cold water of a cold water tank is sent to an interstage heat exchanger of a compressor through a plurality of cold water pumps to absorb heat of air, so that the temperature of the air is reduced, the temperature of water is increased, and then hot water at an outlet of the interstage heat exchanger of the compressor is sent to a hot water tank to be stored for use in the air energy release process; in the compressed air energy release process, hot water of the hot water tank is pumped into an interstage heat exchanger of the expander through a plurality of hot water pumps, the heat of the water is released, the temperature of air is increased, the temperature of the water is reduced, and then cold water at the outlet of the interstage heat exchanger of the expander is pumped into a cold water tank for storage for use in the air energy storage process.
In order to save electricity, the cold water pump and the hot water pump generally adopt variable frequency centrifugal pumps, and the pump lift of the pumps can change along with the liquid level change of the cold water tank and the hot water tank. However, once the running states of the compressor and the expander change, the frequencies of the cold water pump and the hot water pump cannot be adjusted correspondingly in time according to the running state changes of the compressor and the expander, so that the frequency adjustment is relatively delayed, the state stability of the whole air energy storage device in the energy storage process and the energy release process is poor, and the operation requirement cannot be met.
Disclosure of Invention
Based on this, it is necessary to provide a compressed air energy storage device and a grid regulation system for solving the technical problems.
The compressed air energy storage device comprises a first medium tank, a second medium tank, a water pump and a compressor/expander, wherein the water pump and the compressor/expander are sequentially communicated between the first medium tank and the second medium tank along the medium flow direction; the compressed air energy storage device is characterized by further comprising a water separator and a first adjusting module; the water inlet of the water separator is communicated with the water outlet of the water pump, and the water outlet of the water separator is communicated with the waterway inlets of all the interstage heat exchangers on the compressor/expander; the first adjusting module is used for monitoring the water pressure of the water separator and adjusting the frequency of the water pump based on the water pressure.
In one embodiment, the water separator is provided with a first side wall and a second side wall which are distributed along the length direction, the first side wall and the second side wall are oppositely arranged, a water inlet is formed in the first side wall, a plurality of water outlets are formed in the second side wall, the water outlets are uniformly distributed along the length direction of the water separator and are divided into two groups, and the two groups of water outlets are symmetrically distributed about the central axis of the water inlet.
In one embodiment, the first adjusting module comprises a first sensor arranged on the water separator and a first controller electrically connected with the first sensor and the water pump; the first sensor is used for acquiring a water pressure signal in the water separator and converting the water pressure signal into an electric signal; the first controller is used for storing a preset water pressure threshold range, generating a water pressure value according to an electric signal output by the first sensor, judging whether the water pressure value is in the preset water pressure threshold range or not, and adjusting the frequency of the water pump when the water pressure value is not in the preset water pressure threshold range.
In one embodiment, the compressed air energy storage device further comprises an inner extension pipe, a first end of the inner extension pipe is communicated with waterway outlets of all the interstage heat exchangers, a second end of the inner extension pipe extends into the top of the second medium tank from a lower port of the second medium tank, the first end and the second end of the inner extension pipe are distributed relatively, and the first medium tank and the second medium tank are distributed sequentially along the medium flowing direction.
In one embodiment, the second end of the inner extension tube is bent downward.
In one embodiment, the compressed air energy storage device further includes a second adjustment module for obtaining an air temperature magnitude of the air path outlet of the interstage heat exchanger and adjusting a flow rate of the medium flowing through the interstage heat exchanger based on the air temperature magnitude.
In one embodiment, the second regulation module comprises a regulation valve arranged on the interstage heat exchanger, a second sensor arranged on a gas path outlet of the interstage heat exchanger, and a second controller electrically connected with the regulation valve and the second sensor; the second sensor is used for sensing the air temperature of the air channel outlet of the interstage heat exchanger and converting the air temperature into an electric signal; the second controller is used for storing a preset temperature threshold range, generating an air temperature value according to an electric signal output by the second sensor, judging whether the air temperature value is in the preset temperature threshold range or not, and adjusting the opening of the regulating valve when the air temperature value is not in the preset temperature threshold range.
In one embodiment, the regulator valve is disposed at a waterway inlet or a waterway outlet of the interstage heat exchanger.
In one embodiment, the number of the water pumps is 1 or more, and a plurality of the water pumps are communicated between the first medium tank and the water separator in parallel.
A grid regulation system comprising a compressed air energy storage device as claimed in any one of the preceding claims.
According to the compressed air energy storage device and the power grid regulation system, when the parameters of the compressor or the power grid regulation system are changed, the liquid level of the first medium storage tank and the liquid level of the second medium storage tank and the running state of the compressor are changed, so that the water channel inlet pressure of the inter-stage heat exchanger on the compressor is fluctuated, at the moment, the first regulation module can rapidly monitor the water pressure of the water separator and correspondingly change the water pressure, then the frequency of the water pump is regulated according to the water pressure of the water separator until the water pressure of the water separator is maintained within the preset water pressure threshold range, and the water channel inlet pressure of the inter-stage heat exchanger is stabilized, so that the running stability of the whole compressed air energy storage device can be improved, and the operation requirement is met; in addition, the water separator is arranged between the water pump and all the interstage heat exchangers, so that the medium conveyed by the water pump can be separated to all the interstage heat exchangers, the number of the water pump can be reduced, the investment cost of the compressed air energy storage device can be saved, and the failure rate of the compressed air energy storage device can be reduced.
Drawings
Fig. 1 is a schematic diagram of a medium direction of a compressed air energy storage device according to an embodiment of the present utility model during a compressed air energy storage process.
Fig. 2 is a schematic diagram of a medium direction of a compressed air energy storage device according to an embodiment of the utility model during a compressed air energy release process.
Wherein, the reference numerals in the drawings are as follows:
100. a first media tank; 200. a second media tank; 210. an inner extension pipe; 300. a water pump; 310. a variable frequency motor; 410. a compressor; 420. an expander; 400a, an interstage heat exchanger; 500. a water separator; 610. a first sensor; 620. a first controller; 710. and (3) regulating the valve.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Example 1
Referring to fig. 1, this embodiment provides a compressed air energy storage apparatus including a first medium tank 100, a second medium tank 200, a water pump 300, and a compressor 410, the water pump 300 and the compressor 410 being sequentially communicated between the first medium tank 100 and the second medium tank 200 in a medium flow direction. The compressed air energy storage device can be applied to a power grid regulation and control system to realize high-capacity and long-time electric energy storage. It should be noted that the thicker arrow in fig. 1 represents the trend of the medium, that is, the medium flows out from the first medium tank 100 and then flows into the second medium tank 200, wherein the medium temperature of the first medium tank 100 is smaller than the medium temperature of the second medium tank 200.
The first medium tank 100 and the second medium tank 200 are used for storing a medium, and the medium may be water, heat conducting oil or other solutions.
The water pump 300 may be a variable frequency centrifugal pump, and is provided with a variable frequency motor 310 (see fig. 1).
The compressors 410 are multi-stage compressors, and an inter-stage heat exchanger 400a is disposed between any two adjacent stages of compressors 410, and each inter-stage heat exchanger 400a includes a water path and a gas path that can exchange heat, the water path is used for passing medium, and the gas path is used for passing compressed air. Wherein the number of interstage heat exchangers 400a may be determined based on the number of stages of the compressor 410. Note that the ellipses in fig. 1 represent other interstage heat exchangers 400a located between two outermost interstage heat exchangers 400a. Of course, when the number of interstage heat exchangers 400a is 2, the ellipses in FIG. 1 may be omitted.
Further, referring to fig. 1, the compressed air energy storage apparatus provided in this embodiment further includes a water separator 500 and a first adjustment module; the water inlet of the water separator 500 is communicated with the water outlet of the water pump 300, and the water outlet of the water separator 500 is communicated with the water channel inlets of all the interstage heat exchangers 400a on the compressor 410; the first adjusting module is used for monitoring the water pressure of the water separator 500 and adjusting the frequency of the water pump 300 based on the water pressure.
The relationship between the frequency of the water pump 300 and the outlet pressure of the water pump 300 can be described by a performance curve of the water pump 300, and the outlet pressure corresponding to any frequency can be determined by the curve. Wherein, since the outlet of water pump 300 communicates with water separator 500, the water pressure of water separator 500 may be equal to the outlet pressure of water pump 300.
When the parameters of the compressor 410 or the power grid regulation system are turned on/off and changed, the liquid level of the first medium storage tank and the second medium storage tank and the running state of the compressor 410 are changed, so that the water path inlet pressure of the interstage heat exchanger 400a on the compressor 410 is fluctuated, at the moment, the first regulation module rapidly monitors that the water pressure of the water separator 500 is correspondingly changed, and then the frequency of the water pump 300 is regulated according to the water pressure of the water separator 500 until the water pressure of the water separator 500 is maintained within the preset water pressure threshold range, namely, the water path inlet pressure of the interstage heat exchanger 400a is stabilized, so that the running stability of the whole compressed air energy storage device can be improved, and the operation requirement is met; in addition, the water separator 500 is arranged between the water pump 300 and all the interstage heat exchangers 400a, so that the medium conveyed by the water pump 300 can be distributed to all the interstage heat exchangers 400a, the number of the water pump 300 can be reduced, the investment cost of the compressed air energy storage device can be saved, and the failure rate of the compressed air energy storage device can be reduced.
In this embodiment, the water separator 500 has a first sidewall and a second sidewall distributed along a length direction, the first sidewall and the second sidewall are disposed opposite to each other, a water inlet is disposed on the first sidewall, a plurality of water outlets are disposed on the second sidewall, the water outlets are uniformly distributed along the length direction of the water separator 500, the water outlets are also divided into two groups along the length direction of the water separator 500, and the two groups of water outlets are symmetrically distributed about a central axis of the water inlet. The water inlet and the water outlet of the water distributor 500 are arranged in this way, so that the water distribution of the water distributor 500 on all the interstage heat exchangers 400a can be ensured to be uniform. It should be noted that the number of water outlets of the water separator 500 may be the same as the number of the interstage heat exchangers 400a, that is, one water outlet corresponds to one interstage heat exchanger 400a.
Referring to fig. 1, in this embodiment, the first adjusting module includes a first sensor 610 provided on the water separator 500 and a first controller 620 electrically connected to the first sensor 610 and the water pump 300; the first sensor 610 is used for acquiring a water pressure signal in the water separator 500 and converting the water pressure signal into an electric signal; the first controller 620 is configured to store a preset water pressure threshold range, generate a water pressure value according to the electric signal output by the first sensor 610, and then determine whether the water pressure value is within the preset water pressure threshold range, and adjust the frequency of the water pump 300 if the water pressure value is not within the preset water pressure threshold range. Stabilization of the water path inlet pressure of the interstage heat exchanger 400a may be achieved through cooperation of the first sensor 610 and the first controller 620. It will be appreciated that when the water pressure value within the water separator 500 is not within the preset water pressure threshold, the first controller 620 is configured to send an electrical signal to the variable frequency motor 310 of the compressor 410, which is configured to adjust the frequency of the variable frequency motor 310.
The first sensor 610 may be a pressure sensor.
The first controller 620 may be a PLC (Programmable Logic Controller ).
Referring to fig. 1, in this embodiment, the compressed air energy storage apparatus further includes an inner extension pipe 210, a first end of the inner extension pipe 210 is communicated with the waterway outlets of all the interstage heat exchangers 400a, a second end of the inner extension pipe 210 extends from a lower port of the second medium tank 200 to a top of the second medium tank 200, the first end and the second end of the inner extension pipe 210 are relatively distributed, and the first medium tank 100 and the second medium tank 200 are sequentially distributed along a medium flow direction. The inner extension pipe 210 extends into the top of the second medium tank 200, so that the pressure stability of the waterway outlet of the interstage heat exchanger 400a can be maintained, the operation stability of the whole compressed air energy storage device can be further improved, and the operation requirement can be met.
Alternatively, referring to FIG. 1, the second end of the inner extension tube 210 is bent downward. Thus, the medium is prevented from flushing the top of the second medium tank 200, and the service life of the second medium tank 200 can be prolonged.
In this embodiment, the compressed air energy storage device further includes a second adjustment module for obtaining the air temperature magnitude of the air path outlet of the interstage heat exchanger 400a and adjusting the flow rate of the medium flowing through the interstage heat exchanger 400a based on the air temperature magnitude. The air temperature of the air path outlet of the interstage heat exchanger 400a is maintained stable by adjusting the flow rate of the medium flowing through the interstage heat exchanger 400a, so that the operation stability of the whole compressed air energy storage device can be further improved, and the operation requirement is met.
Further, referring to FIG. 1, in this embodiment, the second conditioning module includes a conditioning valve 710 disposed on the interstage heat exchanger 400a, a second sensor (not shown in the figures) disposed on the gas path outlet of the interstage heat exchanger 400a, and a second controller (not shown in the figures) electrically connected to the conditioning valve 710 and the second sensor; the second sensor is used for sensing the air temperature of the air channel outlet of the interstage heat exchanger 400a and converting the air temperature into an electric signal; the second controller is configured to store a preset temperature threshold range, generate an air temperature value according to an electrical signal output by the second sensor, and then determine whether the air temperature value is within the preset temperature threshold range, and if not, adjust the opening of the regulating valve 710. The second sensor, the regulating valve 710 and the second controller cooperate to stabilize the gas path outlet temperature of the interstage heat exchanger 400a. It will be appreciated that the second controller is configured to send an electrical signal to the regulator valve 710 that is configured to vary the opening of the regulator valve 710 when the gas path outlet temperature value of the interstage heat exchanger 400a is not within the preset temperature threshold range.
The second sensor may be a temperature sensor, and the regulating valve 710 may be an electric valve or an electromagnetic valve. Wherein the second sensors and the regulating valves 710 are in one-to-one correspondence with the interstage heat exchanger 400a.
The number of the second controllers may be 1 or more, and the second controllers may be PLCs and may be integrated with the second controllers.
The above-described regulating valve 710 may be disposed at a waterway inlet or a waterway outlet of the interstage heat exchanger 400a. The mounting position of the regulator valve 710 may be selected according to circumstances.
In this embodiment, the number of water pumps 300 is 1 or more, and a plurality of water pumps 300 are connected in parallel between the first medium tank 100 and the water separator 500. When a plurality of water pumps 300 are operated, if some water pumps 300 are damaged, other water pumps 300 can continue to operate without stopping.
Example 2
Referring to fig. 2, this embodiment provides a compressed air energy storage apparatus including a first medium tank 100, a second medium tank 200, a water pump 300, and an expander 420, the water pump 300 and the expander 420 being sequentially communicated between the first medium tank 100 and the second medium tank 200 in a medium flow direction. The compressed air energy storage device can be applied to a power grid regulation and control system to realize high-capacity and long-time electric energy storage. It should be noted that the thicker arrow in fig. 2 represents the direction of the medium, that is, the medium flows out from the first medium tank 100 and then flows into the second medium tank 200, wherein the medium temperature of the first medium tank 100 is higher than the medium temperature of the second medium tank 200.
The first medium tank 100 and the second medium tank 200 are used for storing a medium, and the medium may be water, heat conducting oil or other solutions.
The water pump 300 may be a variable frequency centrifugal pump, and is provided with a variable frequency motor 310 (see fig. 2).
The above-mentioned expander 420 is a multi-stage compressor, and an inter-stage heat exchanger 400a is disposed between any two adjacent stages of the expander 420, and each inter-stage heat exchanger 400a includes a water path and a gas path that can exchange heat, the water path is used for passing through a medium, and the gas path is used for passing through compressed air. Wherein the number of interstage heat exchangers 400a may be determined based on the number of stages of the expander 420. Note that the ellipses in fig. 2 represent other interstage heat exchangers 400a located between two outermost interstage heat exchangers 400a. Of course, when the number of interstage heat exchangers 400a is 2, the ellipses in FIG. 2 may be omitted.
Further, referring to fig. 2, the compressed air energy storage apparatus provided in this embodiment further includes a water separator 500 and a first adjustment module; the water inlet of the water separator 500 is communicated with the water outlet of the water pump 300, and the water outlet of the water separator 500 is communicated with the water channel inlets of all the interstage heat exchangers 400a on the expansion machine 420; the first adjusting module is used for monitoring the water pressure of the water separator 500 and adjusting the frequency of the water pump 300 based on the water pressure.
The relationship between the frequency of the water pump 300 and the outlet pressure of the water pump 300 can be described by a performance curve of the water pump 300, and the outlet pressure corresponding to any frequency can be determined by the curve. Wherein, since the outlet of water pump 300 communicates with water separator 500, the water pressure of water separator 500 may be equal to the outlet pressure of water pump 300.
When the parameters of the expander 420 or the power grid regulation system are turned on/off and the parameters of the power grid regulation system are changed, the liquid levels of the first medium storage tank and the second medium storage tank and the operation state of the expander 420 are changed, so that the water path inlet pressure of the interstage heat exchanger 400a on the expander 420 is fluctuated, at the moment, the first regulation module rapidly monitors that the water pressure of the water separator 500 is correspondingly changed, and then the frequency of the water pump 300 is regulated according to the water pressure of the water separator 500 until the water pressure of the water separator 500 is maintained within the preset water pressure threshold range, namely, the water path inlet pressure of the interstage heat exchanger 400a is stabilized, so that the operation stability of the whole compressed air energy storage device can be improved, and the operation requirement is met; in addition, the water separator 500 is arranged between the water pump 300 and all the interstage heat exchangers 400a, so that the medium conveyed by the water pump 300 can be distributed to all the interstage heat exchangers 400a, the number of the water pump 300 can be reduced, the investment cost of the compressed air energy storage device can be saved, and the failure rate of the compressed air energy storage device can be reduced.
In this embodiment, the water separator 500 has a first sidewall and a second sidewall distributed along a length direction, the first sidewall and the second sidewall are disposed opposite to each other, a water inlet is disposed on the first sidewall, a plurality of water outlets are disposed on the second sidewall, the water outlets are uniformly distributed along the length direction of the water separator 500, the water outlets are also divided into two groups along the length direction of the water separator 500, and the two groups of water outlets are symmetrically distributed about a central axis of the water inlet. The water inlet and the water outlet of the water distributor 500 are arranged in this way, so that the water distribution of the water distributor 500 on all the interstage heat exchangers 400a can be ensured to be uniform. It should be noted that the number of water outlets of the water separator 500 may be the same as the number of the interstage heat exchangers 400a, that is, one water outlet corresponds to one interstage heat exchanger 400a.
Referring to fig. 2, in this embodiment, the first adjusting module includes a first sensor 610 provided on the water separator 500 and a first controller 620 electrically connected to the first sensor 610 and the water pump 300; the first sensor 610 is used for acquiring a water pressure signal in the water separator 500 and converting the water pressure signal into an electric signal; the first controller 620 is configured to store a preset water pressure threshold range, generate a water pressure value according to the electric signal output by the first sensor 610, and then determine whether the water pressure value is within the preset water pressure threshold range, and adjust the frequency of the water pump 300 if the water pressure value is not within the preset water pressure threshold range. Stabilization of the water path inlet pressure of the interstage heat exchanger 400a may be achieved through cooperation of the first sensor 610 and the first controller 620. It will be appreciated that when the water pressure value within the water separator 500 is not within the preset water pressure threshold, the first controller 620 is configured to send an electrical signal to the variable frequency motor 310 of the expander 420, which is configured to adjust the frequency of the variable frequency motor 310.
The first sensor 610 may be a pressure sensor.
The first controller 620 may be a PLC (Programmable Logic Controller ).
Referring to fig. 2, in this embodiment, the compressed air energy storage apparatus further includes an inner extension pipe 210, a first end of the inner extension pipe 210 is communicated with the waterway outlets of all the interstage heat exchangers 400a, a second end of the inner extension pipe 210 extends from a lower port of the second medium tank 200 to a top of the second medium tank 200, the first end and the second end of the inner extension pipe 210 are relatively distributed, and the first medium tank 100 and the second medium tank 200 are sequentially distributed along the medium flow direction. The inner extension pipe 210 extends into the top of the second medium tank 200, so that the pressure stability of the waterway outlet of the interstage heat exchanger 400a can be maintained, the operation stability of the whole compressed air energy storage device can be further improved, and the operation requirement can be met.
Alternatively, referring to fig. 2, the second end of the inner extension tube 210 is bent downward. Thus, the medium is prevented from flushing the top of the second medium tank 200, and the service life of the second medium tank 200 can be prolonged.
In this embodiment, the compressed air energy storage device further includes a second adjustment module for obtaining the air temperature magnitude of the air path outlet of the interstage heat exchanger 400a and adjusting the flow rate of the medium flowing through the interstage heat exchanger 400a based on the air temperature magnitude. The air temperature of the air path outlet of the interstage heat exchanger 400a is maintained stable by adjusting the flow rate of the medium flowing through the interstage heat exchanger 400a, so that the operation stability of the whole compressed air energy storage device can be further improved, and the operation requirement is met.
Further, referring to FIG. 2, in this embodiment, the second conditioning module includes a conditioning valve 710 disposed on the interstage heat exchanger 400a, a second sensor (not shown in the figures) disposed on the gas path outlet of the interstage heat exchanger 400a, and a second controller (not shown in the figures) electrically connected to the conditioning valve 710 and the second sensor; the second sensor is used for sensing the air temperature of the air channel outlet of the interstage heat exchanger 400a and converting the air temperature into an electric signal; the second controller is configured to store a preset temperature threshold range, generate an air temperature value according to an electrical signal output by the second sensor, and then determine whether the air temperature value is within the preset temperature threshold range, and if not, adjust the opening of the regulating valve 710. The second sensor, the regulating valve 710 and the second controller cooperate to stabilize the gas path outlet temperature of the interstage heat exchanger 400a. It will be appreciated that the second controller is configured to send an electrical signal to the regulator valve 710 that is configured to vary the opening of the regulator valve 710 when the gas path outlet temperature value of the interstage heat exchanger 400a is not within the preset temperature threshold range.
The second sensor may be a temperature sensor, and the regulating valve 710 may be an electric valve or an electromagnetic valve. Wherein the second sensors and the regulating valves 710 are in one-to-one correspondence with the interstage heat exchanger 400a.
The number of the second controllers may be 1 or more, and the second controllers may be PLCs and may be integrated with the second controllers.
The above-described regulating valve 710 may be disposed at a waterway inlet or a waterway outlet of the interstage heat exchanger 400a. The mounting position of the regulator valve 710 may be selected according to circumstances.
In this embodiment, the number of water pumps 300 is 1 or more, and a plurality of water pumps 300 are connected in parallel between the first medium tank 100 and the water separator 500. When a plurality of water pumps 300 are operated, if some water pumps 300 are damaged, other water pumps 300 can continue to operate without stopping.
Example 3
This embodiment provides a grid regulation system comprising a compressed air energy storage device as described above.
When the parameters of the on/off compressor or the power grid regulation system change, the operation states of the first and second medium tanks of the compressed air energy storage device and the compressor 410 or the expander 420 change, so that the water channel inlet pressure of the interstage heat exchanger 400a on the compressor fluctuates, at the moment, the first regulation module rapidly monitors the water pressure of the water separator 500 and correspondingly changes, and then the frequency of the water pump 300 is regulated according to the water pressure of the water separator 500 until the water pressure of the water separator 500 is maintained within the preset water pressure threshold range, namely, the water channel inlet pressure of the interstage heat exchanger 400a is stabilized, so that the operation stability performance of the whole compressed air energy storage device can be improved, and the operation requirement is met; in addition, the water separator 500 is arranged between the water pump 300 and all the interstage heat exchangers 400a, so that the medium conveyed by the water pump 300 can be distributed to all the interstage heat exchangers 400a, the number of the water pump 300 can be reduced, the investment cost of the compressed air energy storage device can be saved, and the failure rate of the compressed air energy storage device can be reduced.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. The compressed air energy storage device comprises a first medium tank, a second medium tank, a water pump and a compressor/expander, wherein the water pump and the compressor/expander are sequentially communicated between the first medium tank and the second medium tank along the medium flow direction; the compressed air energy storage device is characterized by further comprising a water separator and a first adjusting module; the water inlet of the water separator is communicated with the water outlet of the water pump, and the water outlet of the water separator is communicated with the waterway inlets of all the interstage heat exchangers on the compressor/expander; the first adjusting module is used for monitoring the water pressure of the water separator and adjusting the frequency of the water pump based on the water pressure.
2. The compressed air energy storage device of claim 1, wherein the water separator has a first side wall and a second side wall distributed along a length direction, the first side wall and the second side wall are oppositely arranged, a water inlet is formed in the first side wall, a plurality of water outlets are formed in the second side wall, the water outlets are uniformly distributed along the length direction of the water separator and are divided into two groups, and the two groups of water outlets are symmetrically distributed about a central axis of the water inlet.
3. The compressed air energy storage device of claim 1, wherein the first regulation module comprises a first sensor disposed on the water separator and a first controller electrically connected to the first sensor and the water pump; the first sensor is used for acquiring a water pressure signal in the water separator and converting the water pressure signal into an electric signal; the first controller is used for storing a preset water pressure threshold range, generating a water pressure value according to an electric signal output by the first sensor, judging whether the water pressure value is in the preset water pressure threshold range or not, and adjusting the frequency of the water pump when the water pressure value is not in the preset water pressure threshold range.
4. A compressed air energy storage apparatus according to any one of claims 1 to 3, further comprising an inner extension pipe, a first end of the inner extension pipe being in communication with the waterway outlets of all the interstage heat exchangers, a second end of the inner extension pipe extending from a lower port of the second media tank to a top of the second media tank, the first and second ends of the inner extension pipe being relatively distributed, the first and second media tanks being sequentially distributed along the media flow direction.
5. The compressed air energy storage device of claim 4, wherein the second end of said inner extension tube is curved downward.
6. A compressed air energy storage apparatus according to any one of claims 1 to 3, further comprising a second regulation module for taking the air temperature magnitude of the gas circuit outlet of the interstage heat exchanger and regulating the flow of the medium through the interstage heat exchanger based on the air temperature magnitude.
7. The compressed air energy storage device of claim 6, wherein the second conditioning module comprises a conditioning valve disposed on the interstage heat exchanger, a second sensor disposed on a gas path outlet of the interstage heat exchanger, and a second controller electrically connected to the conditioning valve and the second sensor; the second sensor is used for sensing the air temperature of the air channel outlet of the interstage heat exchanger and converting the air temperature into an electric signal; the second controller is used for storing a preset temperature threshold range, generating an air temperature value according to an electric signal output by the second sensor, judging whether the air temperature value is in the preset temperature threshold range or not, and adjusting the opening of the regulating valve when the air temperature value is not in the preset temperature threshold range.
8. The compressed air energy storage device of claim 7, wherein the regulating valve is disposed at a waterway inlet or a waterway outlet of the interstage heat exchanger.
9. A compressed air energy storage apparatus according to any one of claims 1 to 3, wherein the number of water pumps is 1 or more, and a plurality of water pumps are in parallel communication between the first media tank and the water separator.
10. A grid conditioning system comprising a compressed air energy storage device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320903532.0U CN220036744U (en) | 2023-04-21 | 2023-04-21 | Compressed air energy storage device and power grid regulation and control system |
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| CN202320903532.0U CN220036744U (en) | 2023-04-21 | 2023-04-21 | Compressed air energy storage device and power grid regulation and control system |
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