A drainage system and method for a high-pressure gas storage reservoir for compressed air energy storage

Abstract

This invention provides a drainage system for a high-pressure compressed air energy storage facility, relating to the field of high-pressure compressed air storage drainage technology. The system includes a high-pressure compressed air storage facility, a water collection well, a drainage pipe, a pressure equalization pipe, and an exhaust pipe. The top elevation of the water collection well is lower than the bottom elevation of the high-pressure compressed air storage facility. One end of the drainage pipe is connected to the bottom of the high-pressure compressed air storage facility, and the other end is connected to the upper part of the water collection well. The pressure equalization pipe connects the water collection well and the space above the liquid level in the high-pressure compressed air storage facility. The exhaust pipe connects the space above the liquid level in the water collection well to the atmosphere. A drain outlet is provided at the bottom of the water collection well. Valves are installed on the drainage pipe, the pressure equalization pipe, the exhaust pipe, and at the drain outlet. This invention also provides a drainage method for a high-pressure compressed air energy storage facility. The solution provided by this invention achieves the purpose of draining the high-pressure compressed air storage facility without affecting its normal operation.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage of high-pressure gas storage reservoirs, and in particular to a drainage system and method for a high-pressure gas storage reservoir for compressed air energy storage. Background Art

[0002] Compressed air energy storage is a new type of energy storage technology. It uses the energy generated by compressed air during low-peak electricity consumption and uses compressed air to generate electricity during peak electricity consumption to achieve the purpose of energy storage.

[0003] Heat is generated during the air compression process and the air temperature will rise. The temperature will drop during discharge due to reduced pressure. During the cyclic operation of compression and discharge, a large amount of water is generated in the high-pressure gas storage reservoir. Since the air pressure in the high-pressure gas storage reservoir is as high as 10MPa (1000m head), the water inside is pressurized water with the same pressure as the compressed air in the high-pressure gas storage reservoir. Direct discharge will destroy the buildings near the drain outlet due to excessive water pressure.

[0004] If the compressed air in the high-pressure gas storage is emptied and then drained during drainage, the pressure in the high-pressure gas storage will directly drop to atmospheric pressure and cannot operate normally. Therefore, a drainage device and method that can not affect the normal operation of the high-pressure gas storage is urgently needed to solve the above problem. Summary of the invention

[0005] The object of the present invention is to provide a drainage system and method for a high-pressure gas storage reservoir for compressed air energy storage, so as to solve the problems existing in the above-mentioned prior art and achieve drainage of the high-pressure gas storage reservoir without affecting the normal operation of the high-pressure gas storage reservoir.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a drainage system for a high-pressure gas storage reservoir for compressed air energy storage, comprising a high-pressure gas storage reservoir, a water collection well, a drainage pipe, a pressure-equalizing pipe and an exhaust pipe, wherein the elevation of the top of the water collection well is lower than the elevation of the bottom of the high-pressure gas storage reservoir, one end of the drainage pipe is connected to the bottom of the high-pressure gas storage reservoir, and the other end is connected to the upper part of the water collection well, the pressure-equalizing pipe can conduct the water collection well and the space above the liquid level in the high-pressure gas storage reservoir, the exhaust pipe connects the space above the liquid level in the water collection well and the atmospheric space, a drain port is provided at the bottom of the water collection well, and valves are provided on the drainage pipe, the pressure-equalizing pipe, the exhaust pipe and the drain port.

[0008] Preferably, it also includes a water level sensor, which can monitor the water level in the water collection well in real time and alarm to notify staff when the water level in the water collection well reaches a set threshold.

[0009] Preferably, the drain port is connected to a drain pipe, and the valve is arranged in the drain pipe.

[0010] The present invention also provides a method for draining a high-pressure gas storage reservoir for compressed air energy storage, wherein the drainage system for a high-pressure gas storage reservoir for compressed air energy storage as described above is used to drain the high-pressure gas storage reservoir, wherein the four valves on the drainage pipe, the equalizing pipe, the exhaust pipe and the drain port are respectively a drainage valve, a equalizing valve, an exhaust valve and a drain valve;

[0011] In the water collecting state, the drainage valve and the pressure equalization valve are in an open state, and the exhaust valve and the water discharge valve are in a closed state;

[0012] When the water level in the water collection well is higher than the set threshold, close the drain valve and the pressure-equalizing valve, open the exhaust valve, and after the pressure in the water collection well becomes normal pressure, open the drain valve to drain the water. After the drainage is completed, close the exhaust valve and the drain valve, open the drain valve and the pressure-equalizing valve to carry out the next round of water collection and drainage.

[0013] Preferably, the drainage system of the high-pressure gas storage reservoir for compressed air energy storage also includes a water level sensor, which can monitor the water level in the water collection well in real time, and alarm to notify the staff when the water level in the water collection well reaches a set threshold; after receiving the alarm signal, the staff will perform corresponding operations on all valves to realize gravity drainage.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] 1. The equalization principle is adopted to make the pressure of the high-pressure gas storage reservoir and the water collection well the same, and the water in the high-pressure gas storage reservoir flows into the water collection well by gravity. In this way, there will be no pressure difference for the water entering the water collection well, so that no jet will be generated to damage the water collection well.

[0016] 2. When the water collection well reaches the drainage level, the alarm will notify the operating personnel to drain the water in time. Before draining, close the drainage valve and the pressure-relieving valve to disconnect the pressure of the high-pressure gas storage reservoir from the water collection well. This can prevent the compressed air in the high-pressure gas storage reservoir from being discharged when the water collection well is vented, thereby ensuring the normal operation of the high-pressure gas storage reservoir.

[0017] 3. When draining water, open the exhaust valve, mainly to discharge the remaining compressed air in the water collection well, eliminate the pressure in the water collection well, make the pressure in the water collection well the same as the atmospheric pressure, and the water in the water collection well changes from pressurized water to non-pressurized water. When discharged, it will not cause damage to the buildings outside the water collection well. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the drainage system of the high-pressure gas storage reservoir for compressed air energy storage provided by the present invention;

[0020] In the figure: 1- high-pressure gas storage reservoir; 2- water collection well; 3- drainage pipe; 4- drainage valve; 5- equalizing pressure pipe; 6- equalizing pressure valve; 7- exhaust pipe; 8- exhaust valve; 9- drain valve; 10- water level sensor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a drainage system and method for a high-pressure gas storage reservoir for compressed air energy storage, so as to solve the problems existing in the above-mentioned prior art and achieve drainage of the high-pressure gas storage reservoir without affecting normal power generation.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention provides a drainage system for a high-pressure gas storage reservoir for compressed air energy storage, such as Figure 1 As shown, it includes a high-pressure gas storage reservoir 1, a water collection well 2, a drainage pipe 3, a pressure-scaling pipe 5 and an exhaust pipe 7;

[0025] Among them, the elevation of the top of the water collecting well 2 is lower than the bottom elevation of the high-pressure gas storage reservoir 1, that is, the height of the high-pressure gas storage reservoir 1 is higher than the water collecting well 2, one end of the drainage pipe 3 is connected to the lower part of the high-pressure gas storage reservoir 1, specifically the bottom of the high-pressure gas storage reservoir 1, and the other end of the drainage pipe 3 is connected to the upper part of the water collecting well 2, specifically the top of the water collecting well 2, thereby realizing the effect of high-pressure water in the high-pressure gas storage reservoir 1 flowing by gravity into the water collecting well 2.

[0026] The equalizing pipe 5 can connect the space above the liquid level in the water collecting well 2 and the high-pressure gas storage reservoir 1 to achieve the same water pressure and air pressure in the water collecting well 2 and the high-pressure gas storage reservoir 1, thereby achieving the purpose of collecting water in the high-pressure gas storage reservoir 1 and flowing into the water collecting well 2.

[0027] The exhaust pipe 7 connects the space above the liquid level in the water collecting well 2 with the atmospheric space, so as to achieve the purpose of exhausting the air before draining the water from the water collecting well 2. A drain port is provided at the bottom of the water collecting well 2. Preferably, a drain pipe is connected to the drain port. Valves are provided on the drainage pipe 3, the pressure-equalizing pipe 5, the exhaust pipe 7 and the drain port. The valve at the drain port can be provided in the drain pipe, and the above valves can all be electric valves. In a preferred embodiment, in order to monitor the water level in the water collecting well 2 in real time, a water level sensor 10 is also provided. The water level sensor 10 can monitor the water level in the water collecting well 2 in real time, and alarm to notify the staff when the water level in the water collecting well 2 reaches the set threshold. After receiving the alarm signal, the staff drains the water collecting well 2. The water level sensor 10 can adopt an integrated sensor with an alarm system, or a separate alarm can be provided to cooperate with the water level sensor 10.

[0028] The four valves on the drain pipe 3, the equalizing pressure pipe 5, the exhaust pipe 7 and the drain outlet are respectively a drain valve 4, a equalizing pressure valve 6, an exhaust valve 8 and a drain valve 9.

[0029] The method for draining water using the high-pressure gas storage drainage system for compressed air energy storage provided by the present invention is as follows:

[0030] In the water collection state, the drainage valve 4 and the pressure relief valve 6 are in the open state, and the exhaust valve 8 and the drain valve 9 are in the closed state;

[0031] When the water level in the water collection well 2 is higher than the set threshold, close the drain valve 4 and the equalizing pressure valve 6, open the exhaust valve 8, and after the pressure in the water collection well 2 becomes normal pressure, open the drain valve 9 to drain the water. After the drainage is completed, close the exhaust valve 8 and the drain valve 9, open the drain valve 4 and the equalizing pressure valve 6 to carry out the next round of water collection and drainage.

[0032] In some embodiments, the high-pressure gas storage reservoir drainage system for compressed air energy storage also includes a water level sensor 10, which can monitor the water level in the water collection well 2 in real time, and alarm to notify the staff when the water level in the water collection well 2 reaches a set threshold; after receiving the alarm signal, the staff will perform corresponding operations on all valves to achieve gravity drainage.

[0033] In addition, an intelligent control system can be set up to control the opening and closing of each electric valve to achieve intelligent control.

[0034] The drainage system and drainage method of the high-pressure gas storage reservoir using compressed air energy storage provided by the present invention have the following effects:

[0035] 1. The equalization principle is adopted to make the pressure of the high-pressure gas storage reservoir 1 and the water collection well 2 the same, and the water in the high-pressure gas storage reservoir 1 flows into the water collection well 2 by gravity. In this way, there will be no pressure difference for the water entering the water collection well 2, so that no high-pressure jet will be generated to damage the water collection well 2.

[0036] 2. When the water collection well 2 reaches the drainage water level, the alarm will notify the operating personnel to drain the water in time. Before draining, close the drainage valve 4 and the pressure-relief valve 6 to disconnect the pressure of the high-pressure gas storage reservoir 1 from the water collection well 2. This can prevent the compressed air in the high-pressure gas storage reservoir 1 from being discharged when the water collection well 2 is vented, thereby ensuring the normal operation of the high-pressure gas storage reservoir 1.

[0037] 3. When draining water, open the exhaust valve 8, mainly to discharge the remaining compressed air in the water collection well 2, eliminate the pressure in the water collection well 2, make the pressure in the water collection well 2 the same as the atmospheric pressure, and the water in the water collection well 2 changes from pressurized water to non-pressurized water, and will not cause damage to the buildings outside the water collection well 2 when discharged.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A drainage system for a high-pressure gas storage reservoir for compressed air energy storage, characterized in that: It includes a high-pressure gas storage reservoir, a water collection well, a drainage pipe, a pressure-equalizing pipe and an exhaust pipe. The elevation of the top of the water collection well is lower than the elevation of the bottom of the high-pressure gas storage reservoir. One end of the drainage pipe is connected to the bottom of the high-pressure gas storage reservoir, and the other end is connected to the upper part of the water collection well. The pressure-equalizing pipe can conduct the water collection well and the space above the liquid level in the high-pressure gas storage reservoir. The exhaust pipe connects the space above the liquid level in the water collection well and the atmospheric space. A drain port is provided at the bottom of the water collection well. Valves are provided on the drainage pipe, the pressure-equalizing pipe, the exhaust pipe and the drain port. It also includes a water level sensor. The water level sensor can monitor the water level in the water collection well in real time and alarm to notify the staff when the water level in the water collection well reaches a set threshold.

2. The high-pressure gas storage drainage system for compressed air energy storage according to claim 1 is characterized in that: The drain port is connected with a drain pipe, and the valve is arranged in the drain pipe.

3. A method for draining water from a high-pressure gas storage reservoir for compressed air energy storage, characterized in that: The high-pressure gas storage reservoir drainage system for compressed air energy storage according to any one of claims 1 to 2 is used to drain the high-pressure gas storage reservoir, and the four valves on the drainage pipe, the equalizing pipe, the exhaust pipe and the drain port are respectively a drainage valve, an equalizing valve, an exhaust valve and a drain valve; In the water collecting state, the drainage valve and the pressure equalization valve are in an open state, and the exhaust valve and the water discharge valve are in a closed state; When the water level in the water collection well is higher than the set threshold, close the drain valve and the pressure-equalizing valve, open the exhaust valve, and after the pressure in the water collection well becomes normal pressure, open the drain valve to drain the water. After the drainage is completed, close the exhaust valve and the drain valve, open the drain valve and the pressure-equalizing valve to carry out the next round of water collection and drainage.

4. The method for draining water from a high-pressure gas storage reservoir for compressed air energy storage according to claim 3, characterized in that: The drainage system of the high-pressure gas storage reservoir for compressed air energy storage also includes a water level sensor, which can monitor the water level in the water collection well in real time and alarm to notify staff when the water level in the water collection well reaches a set threshold; after receiving the alarm signal, the staff will perform corresponding operations on all valves to achieve gravity drainage.

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