Shale gas compressor inlet gas purification device

Abstract

The invention belongs to the technical field of shale gas exploitation, and particularly relates to a shale gas compressor inlet air purification device which comprises a cylindrical shell, an end cover is connected to the top end of the shell through bolts, the bottom end of the shell is fixed to a supporting frame, an air outlet is formed in the upper portion of the shell, and an air inlet is formed in the lower portion of the shell. The isolation plate is located between the air inlet and the air outlet, a mixing cavity is formed between the isolation plate and the bottom of the shell, and a filtering cavity is formed between the isolation plate and the end cover; a plurality of filter elements are mounted on the isolation plate, each filter element comprises a filter element cylinder with one closed end and one open end and a filter element frame for mounting the filter element cylinder, the opening of each filter element cylinder is communicated with the mixing cavity, and the cylinder wall of each filter element cylinder is sequentially provided with an outer-layer stainless steel filter screen, polypropylene cotton, glass fiber cotton and an inner-layer stainless steel filter screen from outside to inside; the outer-layer stainless steel mesh is 100 meshes, the inner-layer stainless steel mesh is 500 meshes, and according to the scheme, the filtering precision is high, and blockage is not prone to occurring.

Description

Technical Field

[0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to an air intake purification device for a shale gas compressor. Background Art

[0002] The boosted production technology plays a vital role in the development of the Fuling shale gas field in the middle and late stages. It is a key process to ensure the continuous and stable production of the gas field. In this process, the compressor is the core equipment for boosted production, and its operating status directly affects the efficiency and stability of the entire production process. However, in the actual production process, shale gas often carries pollutants such as formation impurities, fracturing sand, and liquids into the compressor. These impurities will not only cause wear and corrosion to the precision parts of the compressor, but will also gradually accumulate and cause the compressor performance to decline, and even cause failures, thereby causing irreversible damage to the production of the gas field.

[0003] In order to solve this problem and ensure that the compressor can operate for a long time, efficiently and safely, it is particularly important to add an efficient filtering device to the front-end process area of ​​the compressor. At present, although some filter products have appeared on the market, the filtering accuracy is low and they cannot effectively remove fine sand and droplets; some filters have limited gas processing capacity and cannot meet the needs of large-scale production; and some filters have cumbersome and complicated inspection and maintenance processes, which increases the operation and maintenance costs and time costs.

[0004] The existing compressor pre-filter uses a filter screen. The mixed liquid is sent to the booster skid through a valve, and then the booster skid is pressurized to reach the normal delivery pressure of the gas collection pipeline before production begins. The problems of this filter are: (1) the filtration accuracy is low and it cannot effectively remove fine sand particles and droplets; (2) during operation, hydrates in the mixed liquid are easy to clog the filter, and the filter needs to be cleaned frequently before use. Summary of the invention

[0005] The invention provides a shale gas compressor intake purification device with high filtering accuracy and low clogging resistance.

[0006] Technical solution: A shale gas compressor air intake purification device, including a cylindrical shell, an end cover is bolted to the top of the shell, the bottom of the shell is fixed to a support frame, an air outlet is provided at the upper part of the shell, and an air inlet is provided at the lower part of the shell, an isolation plate is provided inside the shell, the isolation plate is located between the air inlet and the air outlet, a mixing chamber is formed between the isolation plate and the bottom of the shell, and a filter chamber is formed between the isolation plate and the end cover; a plurality of filter elements are installed on the isolation plate, the filter element includes a filter element barrel with one end closed and the other end open, and a filter element frame for installing the filter element barrel, the opening of the filter element barrel is connected to the mixing chamber, and the wall of the filter element barrel is composed of an outer stainless steel filter screen, polypropylene cotton, glass fiber cotton, and an inner stainless steel filter screen from the outside to the inside, the outer stainless steel is 100 mesh, and the inner stainless steel mesh is 500 mesh.

[0007] Beneficial effect: The filter cartridge in this scheme is connected with the mixing chamber to form a space for filtering the mixed liquid. When the mixed liquid enters the mixing chamber from the air inlet, the heavier solid residue falls to the bottom of the mixing chamber, and the gas, liquid and lighter impurities enter the filter cartridge under the action of the airflow, and pass through the outer stainless steel filter with a mesh of 100 in turn, which can filter out impurities > 150μm, and then pass through the glass fiber cotton and polypropylene cotton to filter hydrates, and then pass through the inner stainless steel with 500mu to further finely filter impurities or hydrates > 25μm. The porous shape of the glass fiber cotton and polypropylene cotton in this scheme can absorb hydrates to prevent them from clogging the mesh of the stainless steel filter. At the same time, due to the mesh design of the inner and outer stainless steel filters, the filtration accuracy can be further improved.

[0008] Furthermore, a mesh plate is installed between the inner stainless steel filter and the outer stainless steel filter, and the filter cartridge is divided into a plurality of filter cartridge filling cavities from top to bottom, and polypropylene cotton and glass fiber cotton are filled in the filter cartridge filling cavities. This design can prevent polypropylene cotton and glass fiber cotton from accumulating at the bottom of the filter cartridge due to gravity.

[0009] Furthermore, a liquid level meter is connected to the side of the shell to detect the liquid accumulation in the shell and discharge the waste in time.

[0010] Furthermore, six filter element installation ports are arranged on the isolation plate, and a filter element is installed in each filter element installation port to improve filtering efficiency.

[0011] Furthermore, the shell is provided with a first interface of the liquid level gauge; the bottom of the shell is provided with a sewage outlet, which is connected to the main pipe of the T-tube, the first branch of the T-tube is connected to the sewage pipe, and the second branch of the T-tube is the second interface of the liquid level gauge; the first interface of the liquid level gauge and the second interface of the liquid level gauge are connected to a liquid level gauge to form a communicating vessel. This design enables the liquid level gauge to reflect the height of the accumulated liquid in real time, making it convenient for maintenance personnel to open the sewage pipe for sewage discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a shale gas compressor intake purification device of the present invention;

[0013] Figure 2 for Figure 1 Cross-sectional view of the middle filter cartridge;

[0014] Figure numerals: outer shell 1, end cover 2, support frame 3, T-shaped pipe 4, sewage pipe 5, air inlet 6, air outlet 7, isolation plate 8, filter element tube 9, filter element frame 10, outer stainless steel filter screen 11, polypropylene cotton 12, glass fiber cotton 13, inner stainless steel filter screen 14, mesh plate 15. DETAILED DESCRIPTION

[0015] like Figure 1 , Figure 2 As shown, a shale gas compressor intake purification device includes a cylindrical shell 1, the top end of the shell 1 is bolted to an end cover 2, and the bottom end of the shell 1 is fixed on a support frame 3.

[0016] A sewage outlet is provided at the bottom of the housing 1, which is connected to a T-tube 4. A first branch of the T-tube 4 is connected to a sewage pipe 5, on which a one-way valve is provided. A second branch of the T-tube 4 is a second interface of the liquid level meter.

[0017] The tube body of the housing 1 is provided with a first interface of the liquid level meter, an air inlet 6, and an air outlet 7 in sequence from bottom to top. The first interface of the liquid level meter and the second interface of the liquid level meter are connected to an external liquid level meter to form a connector.

[0018] An isolation plate 8 is provided inside the housing 1 between the air inlet 6 and the air outlet 7. A mixing chamber is formed between the isolation plate 8 and the bottom of the housing 1, and a filter chamber is formed between the isolation plate 8 and the end cover 2. Six filter element installation ports are evenly arranged along the circumference of the isolation plate 8, and six filter elements are arranged in the filter chamber. The filter element includes a filter element frame 10 and a filter element cartridge 9 with a closed upper end but an open lower end. The filter element frame 10 is fixed on the partition plate, and the filter element cartridge 9 is installed on the filter element frame 10. The lower end opening of the filter element cartridge 9 is threadedly connected to the filter element installation port. The wall of the filter element cartridge 9 is composed of an outer stainless steel filter screen 11, polypropylene cotton 12, glass fiber cotton 13, and an inner stainless steel filter screen 14 from the outside to the inside. The outer stainless steel filter screen 11 is 100 mesh, and the inner stainless steel filter screen 14 is 500 mesh. Since the filter cartridge 9 is vertically installed in the outer shell 1, in order to prevent the polypropylene cotton 12 and the glass fiber cotton 13 from accumulating at the bottom of the filter cartridge 9 due to gravity, a mesh plate 15 is installed between the inner stainless steel filter screen 14 and the outer stainless steel filter screen 11, and the filter cartridge 9 is divided into a plurality of filter filling cavities from top to bottom, and the polypropylene cotton 12 and the glass fiber cotton 13 are filled in the filter filling cavities.

[0019] The working process of this embodiment:

[0020] (1) The high-pressure airflow carries the produced mixed liquid into the mixing chamber from the air inlet 6 of the shale gas compressor air inlet purification device, and enters the filter cartridge 9 driven by the high-pressure airflow;

[0021] (2) Gas and a small amount of gas-liquid mixture can pass through the filter cartridge 9 and flow out from the gas outlet 7; heavier sand and liquid fall into the mixing chamber due to gravity to form liquid accumulation;

[0022] (3) The liquid level meter detects the liquid level in the mixing chamber. When it exceeds the set value, the sewage pipe 5 is opened to discharge the accumulated liquid.

[0023] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by the present invention shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A shale gas compressor air intake purification device, comprising a cylindrical shell, the top of the shell is bolted with an end cover, the bottom of the shell is fixed on a support frame, the upper part of the shell is provided with an air outlet, and the lower part of the shell is provided with an air inlet, characterized in that: An isolation plate is provided inside the shell, and the isolation plate is located between the air inlet and the air outlet. A mixing chamber is formed between the isolation plate and the bottom of the shell, and a filter chamber is formed between the isolation plate and the end cover. A plurality of filter elements are installed on the isolation plate, and the filter element includes a filter element barrel with one end closed and the other end open, and a filter element rack for installing the filter element barrel. The opening of the filter element barrel is connected to the mixing chamber. The wall of the filter element barrel is composed of an outer stainless steel filter screen, polypropylene cotton, glass fiber cotton, and an inner stainless steel filter screen from the outside to the inside. The outer stainless steel is 100 mesh, and the inner stainless steel mesh is 500 mesh.

2. The shale gas compressor intake air purification device according to claim 1, characterized in that: A mesh plate is installed between the inner stainless steel filter screen and the outer stainless steel filter screen, and the filter cartridge is divided into a plurality of filter filling cavities from top to bottom, and polypropylene cotton and glass fiber cotton are filled in the filter filling cavities.

3. The shale gas compressor intake air purification device according to claim 2, characterized in that: A liquid level meter is connected to the side of the shell.

4. The shale gas compressor intake air purification device according to claim 3, characterized in that: The isolation plate is provided with 6 filter element installation ports, and a filter element is installed in each filter element installation port.

5. The shale gas compressor intake air purification device according to claim 4, characterized in that: The shell is provided with a first interface of the liquid level gauge; the bottom of the shell is provided with a sewage outlet, which is connected to the T-tube main pipe, the first branch of the T-tube is connected to the sewage pipe, and the second branch of the T-tube is the second interface of the liquid level gauge; the first interface of the liquid level gauge and the second interface of the liquid level gauge are connected to a liquid level gauge.

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