Energy storage compressed air sand and liquid removal integrated device and method

Abstract

The invention aims to provide the energy storage and compressed air desanding and liquid removal integrated device and method so as to effectively remove gravels and liquid drops carried when air is discharged in the compressed air energy storage and release stage of a waste oil and gas reservoir and protect power generation equipment. The sand and liquid removal integrated device comprises a wet trapping section, a cyclone separation section and a filtering separation section. And the cyclone separation section is positioned right above the wet trapping section and right below the filtering separation section. The cyclone separation section comprises an air inlet, a middle connector, a liquid discharge pipe, two pre-separation cyclone pipes and a fine separation cyclone pipe, and the lower ends of the cyclone pipes are inserted into the wet trapping section; the two pre-separation rotational flow pipes are connected with a gas inlet of the device and are connected in series with the fine separation rotational flow pipe through the middle connecting body, so that a gravity settling and inertial separation process is formed. The filtering and separating section comprises a mist catcher and an air outlet. According to the energy-storage compressed air sand and liquid removal integrated device, separation mechanisms such as centrifugal separation, gravity settling, wet trapping, inertial separation and filtering separation are coupled, efficient and low-consumption removal of sand and liquid drops in compressed air can be achieved, and the device is high in separation precision, compact in structure and small in occupied area.

Description

Technical Field

[0001] This invention relates to the field of gas purification and separation equipment technology, and in particular to an integrated device and method for desanding and deliquifying compressed air with energy storage. Background Technology

[0002] Compressed air energy storage is an important means of energy adjustment under the dual-carbon environment. The innovative use of abandoned oil and gas reservoirs as gas storage facilities utilizes the infrastructure of abandoned oil and gas wells, reducing the cost and environmental impact of constructing new facilities and promoting the integration of renewable energy and the development of a low-carbon economy. However, abandoned oil and gas reservoirs have complex geological characteristics such as low permeability and high water saturation. During the energy release process after utilizing abandoned oil and gas reservoirs for energy storage, the high air pressure, large volume, and fast flow rate easily carry a large amount of solid gravel. Power generation equipment requires high precision in the extracted compressed air; therefore, desanding and deliquescence of the compressed air before it enters the power generation equipment is a necessary process.

[0003] Traditional sand and liquid removal technologies in oil and gas fields mainly include: gravity settling, which suffers from low separation efficiency, requires very slow gas flow rates, has large equipment size, requires long residence times, and is unsuitable for compressed air purification; filtration separation, which suffers from high pressure drop, easy clogging, high cost, selectivity for dispersed phase particle size, and difficulty in subsequent cleaning; inertial separation, which suffers from limited separation efficiency, complex structural design, pressure drop after airflow deflection or impact with baffles, and potential secondary entrainment, where separated dispersed phases may be carried back by high-speed gas, affecting the separation and purification effect; and centrifugal separation, which has advantages such as simple structure, high separation efficiency, and ease of operation, making it a relatively good choice. However, single-stage cyclone centrifugal separation may not be thorough, and separation efficiency may decrease after the gas flow rate exceeds a certain range. Single-technology devices generally suffer from large space requirements, high pressure drop, low efficiency, and low precision.

[0004] Therefore, given the numerous problems existing in air purification and related treatment technologies in compressed air energy storage, it is of great significance to develop a compressed air sand and liquid removal device that couples multiple separation processes to achieve efficient removal of sand and droplets. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide an integrated device and method for removing sand and liquid from compressed air in energy storage systems. This method couples separation mechanisms such as centrifugal separation, gravity sedimentation, wet collection, inertial separation, and filtration separation to achieve efficient and low-consumption removal of sand and liquid droplets from compressed air. It solves problems such as large footprint, low separation efficiency, and large pressure drop in separation equipment, and avoids the impact and damage of sand and liquid droplets in compressed air on downstream power generation equipment.

[0006] The technical solution adopted in this invention is as follows: An integrated sand and liquid removal device for energy storage compressed air, characterized in that the integrated sand and liquid removal device includes a wet collection section, a cyclone separation section, and a filtration separation section. The cyclone separation section is located directly above the wet collection section and directly below the filtration separation section. The cyclone separation section includes an air inlet, an intermediate connecting body, a drain pipe, two pre-separation cyclone tubes, and one fine separation cyclone tube, with the lower end of the cyclone tubes inserted into the wet collection section; both the pre-separation cyclone tubes and the fine separation cyclone tube are fixed to the intermediate connecting body. The filtration separation section includes a mist eliminator and an air outlet.

[0007] The wet collection section includes a water seal at a certain liquid level, a bottom cone section, and a bottom outlet, realizing the wet collection and separation process of particles and the sewage discharge process.

[0008] The pre-separation cyclone tube has a single-entry structure, and the two pre-separation cyclone tubes are connected in parallel; the air inlet of the fine cyclone separator has a double volute structure.

[0009] The intermediate connecting body includes a central partition and an intermediate connecting component, which enables the inlet of the pre-separation cyclone separator and the gas phase outlet to form gravity settling and inertial separation processes, respectively, while increasing the residence time of the gas-liquid-solid cyclone separation section.

[0010] The overflow port of the fine cyclone separator in the cyclone separation section is inserted into the filtration separation section. The top of the overflow pipe is modified so that gas enters the filtration separation section through the side hole, which improves gas jet aggregation and prevents liquid backflow in the mist collection section.

[0011] The top of the drain pipe is connected to the mist collection section and the filtration and separation section, which facilitates the discharge of the liquid accumulated at the bottom of the filtration and separation section. The bottom of the drain pipe is inserted with a water seal from the wet collection section to prevent gas from the cyclone separation section from entering the drain pipe.

[0012] The mist eliminator in the filtration and separation section can be a baffle plate type or a metal wire mesh type.

[0013] Based on the above-mentioned device, the present invention also relates to a separation method for an integrated energy storage compressed air desanding and liquid removal device, comprising the following steps:

[0014] 1) Compressed air carrying sand and droplets enters the cyclone separation section through the air inlet of the device. After centrifugal separation by two pre-separation cyclone tubes, the sand and droplets are thrown against the wall of the cyclone tubes and flow into the water seal of the bottom wet collection section through the material leg, completing the wet collection and separation process. After separation, the gas flows out from the overflow port of the pre-separation cyclone tube, realizing the initial separation of sand and droplets.

[0015] 2) Unseparated gravel and droplets flow out of the overflow pipe of the pre-separation cyclone tube with the gas and collide with the middle baffle of the intermediate connector to form inertial separation. The separated droplets and particles enter the wet collection section downward and are captured and separated by the water seal. The remaining gravel and droplets are carried by the gas phase into the fine separation cyclone tube. After centrifugal separation again, most of the gravel and droplets flow into the bottom wet collection section water seal from the bottom outlet. The gas containing a small amount of droplets and gravel enters the filtration separation section through the overflow outlet for further separation of gravel and droplets.

[0016] 3) Air carrying a small amount of droplets and gravel enters the filtration and separation section from the vortex diversion section. After being filtered and separated by the mist eliminator, the droplets and particles slide down the side wall and flow into the water seal of the wet collection section through the drain pipe. The separated air is discharged from the air outlet at the top of the device, completing the entire sand and liquid removal process.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] 1. The energy storage compressed air sand and liquid removal integrated device proposed in this invention includes a wet collection section, a cyclone separation section and a filtration separation section. It has a compact structure and couples separation mechanisms such as centrifugal separation, gravity sedimentation, wet collection, inertial separation and filtration separation to achieve efficient and low-consumption removal of sand and liquid droplets in compressed air, avoiding the impact and damage of sand and liquid droplets in compressed air on downstream power generation equipment.

[0019] 2. The device's cyclone separation section is equipped with a structure in which two pre-separation cyclone tubes are connected in parallel and then connected in series with a fine cyclone separation tube. The underflow port of the three cyclone tubes is inserted into the wet collection section, which can efficiently separate sand and droplets and improve the problem of secondary entrainment.

[0020] 3. The overflow port of the fine cyclone separator in the cyclone separation section is inserted into the filtration separation section. The top of the overflow pipe is modified so that gas enters the filtration separation section through the side hole, which improves the gas jet aggregation and effectively prevents liquid backflow in the mist collection section. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an integrated energy storage compressed air desanding and liquid removal device according to the present invention. Figure 2 This is a schematic diagram of the cross-section of the cyclone separation section.

[0022] Figure 1 Components: 1. Air outlet, 2. Upper shell, 3. Air inlet, 4. Pre-separation cyclone tube, 5. Middle shell, 6. Bottom outlet, 7. Bottom conical section, 8. Water seal, 9. Drain pipe, 10. Fine separation cyclone tube, 11. Middle connector, 12. Middle partition, 13. Mist eliminator, 14. Top cover. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] The following specific embodiments illustrate the implementation method of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0025] Referring to the accompanying drawings, the structures, proportions, sizes, etc., depicted in the drawings are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the conditions under which the invention can be implemented and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the positional limitations used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0026] Figure 1 This is a schematic diagram of the integrated sand and liquid removal device for energy storage compressed air according to the present invention. As shown in the figure, the integrated sand and liquid removal device for energy storage compressed air includes a wet collection section, a cyclone separation section, and a filtration separation section. The cyclone separation section is located directly above the wet collection section and directly below the filtration separation section. The cyclone separation section includes an air inlet 3, an intermediate connection 11, a drain pipe 9, two pre-separation cyclone tubes 4, and a fine separation cyclone tube 10, with the lower end of the cyclone tubes inserted into the wet collection section. The pre-separation cyclone tubes 4 and the fine separation cyclone tube 10 are both fixed on the intermediate connection 11. The filtration separation section includes a mist eliminator 13 and an air outlet 1. The wet collection section includes a water seal 8 at a certain liquid level, a bottom conical section 7, and a bottom outlet 6, realizing the wet collection and separation process of particles and the sewage discharge process. The pre-separation cyclone tubes 4 have a single-cut-in structure, and the two pre-separation cyclone tubes 4 are connected in parallel; the fine cyclone separation tube 10 has a double volute structure. The intermediate connector 11 includes a central partition and an intermediate connector, which enables the inlet of the pre-separation cyclone tube 4 and the gas phase outlet to form gravity settling and inertial separation processes, respectively, while increasing the residence time of the gas-liquid-solid cyclone separation section.

[0027] The overflow pipe of the fine cyclone separator 10 in the cyclone separation section is inserted into the filter separation section. The top of the overflow pipe is modified so that gas enters the filter separation section through the side hole, which improves gas jet aggregation and prevents liquid backflow in the mist collection section.

[0028] The top of the drain pipe 9 is connected to the filtration and separation section to facilitate the discharge of liquid accumulated at the bottom of the filtration and separation section. The bottom of the drain pipe is inserted into the water seal 8 of the wet collection section to prevent gas from the cyclone separation section from entering the drain pipe 9. The mist eliminator 13 of the filtration and separation section can be a baffle plate type or a metal wire mesh type.

[0029] The specific operation process is as follows: Compressed air carrying sand and droplets enters the cyclone separation section through the air inlet 3 of the device. After centrifugal separation by two pre-separation cyclone tubes 4, the sand and droplets are thrown against the wall of the cyclone tubes and flow into the bottom wet collection section water seal 8 through the material leg, completing the wet collection separation process. After separation, the gas flows out from the overflow port of the pre-separation cyclone tube 4, realizing the initial separation of sand and droplets. When the unseparated sand and droplets flow out from the overflow port of the pre-separation cyclone tube 4 with the gas, they collide with the middle partition of the intermediate connecting body 11 to form inertial separation. The separated droplets and particles enter the wet collection section downward and are collected and separated by the water seal 8. The remaining sand and droplets are carried by the gas phase into the fine separation cyclone tube 10. After centrifugal separation again, most of the sand and droplets flow into the bottom wet collection section water seal 8 through the bottom outlet. The gas containing a small amount of droplets and sand enters the filtration separation section through the overflow port for further separation of sand and droplets.

[0030] Air carrying a small amount of droplets and grit enters the filtration and separation section from the vortex diversion section. After being filtered and separated by the mist eliminator 13, the droplets and particles slide down the side wall and flow into the water seal 8 of the wet collection section through the drain pipe 9. The separated air is discharged from the air outlet 1 at the top of the device, completing the entire sand and liquid removal process.

[0031] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or variations of equivalent structures or equivalent processes that can be made by those skilled in the art without creative effort, or directly or indirectly applied to other related technical fields, are still within the scope of protection of the present invention.

Claims

1. An integrated device for desanding and deliquescence using compressed air with energy storage, characterized in that, The integrated sand and liquid removal device includes a wet collection section, a cyclone separation section, and a filtration separation section. The cyclone separation section is located directly above the wet collection section and directly below the filtration separation section. The cyclone separation section includes an air inlet, an intermediate connecting body, a drain pipe, two pre-separation cyclone tubes, and one fine separation cyclone tube, with the lower ends of the cyclone tubes inserted into the wet collection section; both the pre-separation and fine separation cyclone tubes are fixed to the intermediate connecting body. The filtration separation section includes a mist eliminator and an air outlet.

2. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The wet collection section includes a water seal at a certain liquid level, a bottom cone section, and a bottom outlet, realizing the wet collection and separation process of particles and the sewage discharge process.

3. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The pre-separation cyclone tube has a single-cut-in structure, and the two pre-separation cyclone tubes are connected in parallel; the fine cyclone separator has a double volute structure.

4. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The intermediate connecting body includes a central partition and an intermediate connecting component, which enables the inlet of the pre-separation cyclone separator and the gas phase outlet to form gravity settling and inertial separation processes, respectively, while increasing the residence time of the gas-liquid-solid cyclone separation section.

5. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The overflow pipe of the fine cyclone separator in the cyclone separation section is inserted into the filtration separation section. The top of the overflow pipe is modified so that gas enters the filtration separation section through the side hole, which improves gas jet aggregation and prevents liquid backflow in the mist collection section.

6. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The top of the drain pipe is connected to the filtration and separation section to facilitate the discharge of liquid accumulated at the bottom of the filtration and separation section. The bottom of the drain pipe is inserted with a water seal from the wet collection section to prevent gas from the cyclone separation section from entering the drain pipe.

7. The integrated energy storage compressed air sand and liquid removal device according to claim 1, characterized in that, The mist eliminator in the filtration and separation section can be a baffle plate type or a metal wire mesh type.

8. A separation method using the integrated sand and liquid removal device for energy storage compressed air as described in any one of claims 1-7, comprising the following steps: 1) Compressed air carrying sand and droplets enters the cyclone separation section through the air inlet of the device. After centrifugal separation by two pre-separation cyclone tubes, the sand and droplets are thrown against the wall of the cyclone tubes and flow into the water seal of the bottom wet collection section through the material leg, completing the wet collection and separation process. After separation, the gas flows out from the overflow port of the pre-separation cyclone tube, realizing the initial separation of sand and droplets. 2) Unseparated gravel and droplets flow out of the overflow pipe of the pre-separation cyclone tube with the gas and collide with the middle baffle of the intermediate connector to form inertial separation. The separated droplets and particles enter the wet collection section downward and are captured and separated by the water seal. The remaining gravel and droplets are carried by the gas phase into the fine separation cyclone tube. After centrifugal separation again, most of the gravel and droplets flow into the bottom wet collection section water seal from the bottom outlet. The gas containing a small amount of droplets and gravel enters the filtration separation section through the overflow outlet for further separation of gravel and droplets. 3) Air carrying a small amount of droplets and gravel enters the filtration and separation section from the vortex diversion section. After being filtered and separated by the mist eliminator, the droplets and particles slide down the side wall and flow into the water seal of the wet collection section through the drain pipe. The separated air is discharged from the air outlet at the top of the device, completing the entire sand and liquid removal process.

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