High-pressure air sand and chlorine removal system in salt cavern compressed air energy storage system

Abstract

The utility model discloses a high-pressure air sand and chlorine removal system in a salt cavern compressed air energy storage system, which belongs to the technical field of energy storage and comprises a sand removal pry connected with a salt cavern injection-production tree, and a cyclone separator, a filter separator and a coalescence separator which are sequentially connected with the sand removal pry, the devices are connected through a pipeline. According to the system, high-pressure air sand removal and dechlorination are achieved, meanwhile, large pressure loss and temperature loss are avoided, the working environment of follow-up equipment can be guaranteed, the risk of corrosion and blockage is reduced, the safety and reliability of the equipment are improved, and the system is very suitable for being coupled into the energy release link of compressed air energy storage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of energy storage, and particularly relates to a high-pressure air desanding and dechlorination system in a salt cavern compressed air energy storage system. BACKGROUND

[0002] Salt cavern compressed air energy storage is to use the surplus power during the valley of power system load to drive the air compressor by the motor to store the air in the salt cavern. When the peak of power system load, the high-pressure air is introduced into the expander to generate power to meet the peak shaving needs of the power system.

[0003] The existing salt cavern compressed air energy storage power station directly injects the compressed air into the salt cavern during the energy storage stage, and then the high-pressure air is introduced into the heat exchange system to be heated, and then the high-pressure air is introduced into the expander to generate power to send the power to the power grid.

[0004] It is found through actual engineering operation that the pipeline and the heat exchanger have a very serious corrosion problem during the energy release stage. The reason is that there is brine and a large amount of dust and rock particles in the salt cavern, and the compressed air energy storage power station frequently stores and releases energy, which causes the high-pressure air to be frequently injected and released in the salt cavern. The released high-pressure air contains a large amount of sand-like rock particles and rich brine droplets. In the heat exchange area of the heat exchanger, the sand-like particles are easy to deposit and adhere to the pipe wall due to the increase of the flow area and the decrease of the air flow rate. The brine droplets are rich in chloride ions and have strong corrosive properties. The combination of the acid liquid and the sand-like particles causes the heat exchanger to be blocked and corroded, and the first two stages of the heat exchanger are the most obvious.

[0005] In order to keep the compressed air energy storage system process flow long-term and reliable operation, it is urgent to research a salt cavern outlet high-pressure air online desanding and dechlorination system and a desanding and dechlorination method. UTILITY MODEL CONTENTS

[0006] The technical problem to be solved by the utility model is to provide a high-pressure air desanding and dechlorination system in a salt cavern compressed air energy storage system, which can remove the sand and chlorine in the salt cavern to prevent the corrosion of the equipment.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] A high-pressure air desanding and dechlorination system in a salt cavern compressed air energy storage system, comprising a desanding pry connected with a salt cavern injection and production tree, and a cyclone separator, a filter separator and a coalescing separator connected with the desanding pry in sequence, the coalescing separator being connected with a first-stage heat exchanger, and the above-mentioned devices being connected through a pipeline.

[0009] The utility model technical scheme is further improved in that the cyclone separator, the filter separator and the coalescing separator are respectively connected with a brine collection tank.

[0010] The further improvement of the technical scheme of the utility model lies in that the sand removing crowbar is connected with the solid waste treatment device.

[0011] The further improvement of the technical scheme of the utility model lies in that the sand removing crowbar is selected from one of a filter screen type sand removing device, a gas well cyclone sand removing device or a high pressure cyclone sand removing device, and the filter separator comprises a horizontal blade filter separator.

[0012] The further improvement of the technical scheme of the utility model lies in that the filter separator and the coalescence separator are respectively provided with auxiliary instruments, and the auxiliary instruments comprise a pressure transmitter, a liquid level meter and automatic drainage.

[0013] Thanks to the above technical scheme, the utility model has the following technical progress:

[0014] The high pressure air sand removing and chlorine removing system in the salt cavern compressed air energy storage system of the application can reduce the resistance and the pressure to the minimum of about 128 Pa under the premise of realizing sand removing and chlorine removing, has little influence on the thermal rate of the compressed air energy storage power station, and improves the long-term reliability of the compressed air energy storage power station equipment.

[0015] The system can realize high pressure air sand removing and chlorine removing without great pressure loss and temperature loss, is very suitable for coupling into the energy releasing link of the compressed air energy storage, and can remove the large particle solid impurities and large particle chlorine compound impurities (≥0.1 mm) in the high pressure air purified through the system by the sand removing crowbar. After removing the large particle impurities, the process gas is conveyed to the inlet station cyclone separator (cyclone + blade separation form, separation efficiency ≥ 99.8%) along the pipeline, removes the solid particles of Φ10 μm and above droplets, realizes the removal of the solid particles of Φ5 μm and above droplets through the horizontal filter separator (multiple filter cores + blade separation form, separation efficiency ≥ 99.8%), and enters the coalescence separator (process gas in-out form through multiple filter cores + blade separation form), separation efficiency ≥ 99.8%, and realizes the removal of the solid particles of Φ1 μm and above droplets. Because the water content of the droplets in the high pressure air is greatly reduced, the content of chlorine ions is also greatly reduced, so that the working environment of the subsequent equipment can be ensured, the risk of corrosion and blockage is reduced, and the safety and reliability of the equipment are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the high pressure air sand removing and chlorine removing system schematic diagram of the utility model salt cavern compressed air energy storage system;

[0017] Among them, 1, salt cavern injection and production tree, 2, sand removing crowbar, 3, cyclone separator, 4, filter separator, 5, coalescence separator, 6, first stage heat exchanger, 7, brine collection tank, 8, solid waste treatment device. DETAILED DESCRIPTION

[0018] The utility model will be further explained in detail in combination with examples:

[0019] When the salt cavern compressed air energy storage power station stores energy, the compressed air is directly injected into the salt cavern, and when the energy is released, the high-pressure air is led out of the salt cavern and directly into the heat exchange system to warm up and work. A high-pressure air desanding and dechlorination system in a salt cavern compressed air energy storage system, as shown in the figure, the salt cavern injection tree 1 is connected to the desanding pry 2 to remove large particle solid impurities and large particle chloride impurities in the high-pressure air. The desanding pry 2 is connected to the cyclone separator 3, that is, the high-pressure gas after removing large particle impurities is transported to the inlet station cyclone separator 3 to remove solid particles and liquid droplets with a diameter of Φ10 μm. The cyclone separator 3 and the filter separator 4 are connected, and the filter separator 4 is further used to remove solid particles and liquid droplets with a diameter of Φ5 μm. The filter separator 4 and the coalescence separator 5 are connected, and the coalescence separator 5 is used to remove solid particles and liquid droplets with a diameter of 5Φ1 μm. Figure 1

[0020] The cyclone separator 3, the filter separator 4 and the coalescence separator 5 are respectively connected to the brine collection tank 7, and the removed solid particle impurities and liquid droplets are collected to the brine collection tank 7.

[0021] The desanding pry 2 is connected to the solid waste treatment device 8, and the removed large particle sand-like substances are transported to the solid waste treatment device 8 for treatment. The desanding pry can adopt a filter screen type sand removal device, or a gas well cyclone sand removal device, or a high-pressure cyclone sand removal device, which has the functions of gas, water and sand multi-phase separation, and can preliminarily purify the high-pressure air and remove large particle sand-like substances ≥0.1 mm in the high-pressure air outlet of the salt cavern.

[0022] The cyclone separator 3 causes rotational movement by tangential introduction of airflow, so that solid particles or liquid droplets with large inertia centrifugal force are thrown to the outer wall surface and separated. The cyclone separator 3 is in the form of a cyclone + blade separation, and can remove solid particles or liquid droplets with a diameter of Φ10 μm and above.

[0023] The filter separator 4 is used to further separate liquid droplets in the high-pressure air, and to remove solid particles or liquid droplets with a diameter of Φ5 μm and above. Generally, a horizontal filter separator is used to filter impurities in the air and condense liquid droplets for removal. The filter medium can be composed of glass fibers and other high-performance synthetic fiber materials. At the same time, the filter separator 4 is equipped with auxiliary instruments such as pressure transmitters, liquid level meters and automatic water drainage devices.

[0024] ​The last step gas-liquid separation uses coalescence separator 5 to remove solid particles or liquid droplets of Φ1 μm and above. It generally contains two filter cores, namely coalescence filter core and separation filter core. First, the flow passes through the coalescence filter core, which filters out solid impurities and coalesces tiny water droplets into larger ones. The flow passes through the separation filter core to separate and discharge the liquid droplets. The device is equipped with pressure transmitters, liquid level meters, automatic drainage and other auxiliary instruments.

Claims

1. A high-pressure air desanding and dechlorination system in a salt cavern compressed air energy storage system, characterized in that: The device comprises a sand removing lever (2) connected with a salt cavern injection-production tree (1), a cyclone separator (3), a filter separator (4) and a coalescence separator (5) connected with the sand removing lever (2) in sequence, and the coalescence separator (5) is connected with a primary heat exchanger (6), and the above-mentioned devices are connected through pipelines.

2. The sand and chlorine removal system for high pressure air in a salt cavern compressed air energy storage system according to claim 1, characterized in that: The cyclone separator (3), the filter separator (4) and the coalescence separator (5) are connected with a brine collecting tank (7) respectively.

3. The sand and chlorine removal system for high pressure air in a salt cavern compressed air energy storage system according to claim 1, characterized in that: The sand removing lever (2) is connected with a solid waste treatment device (8).

4. The sand and chlorine removal system for high pressure air in a salt cavern compressed air energy storage system according to claim 1, characterized in that: The sand removing lever (2) is selected from one of a filter screen sand removing device, a gas well cyclone sand removing device or a high pressure cyclone sand removing device, and the filter separator (4) comprises a horizontal blade filter separator.

5. The sand and chlorine removal system for high pressure air in a salt cavern compressed air energy storage system according to claim 4, characterized in that: The filter separator (4) and the coalescence separator (5) are respectively provided with auxiliary instruments, and the auxiliary instruments comprise a pressure transmitter, a liquid level meter and automatic drainage.

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