Bidirectional filter and bidirectional filtering system for high-pressure methane-hydrogen fuel gas

Abstract

The utility model provides a two-way filter for high-pressure methane hydrogen fuel gas, which comprises a barrel with an opening at the upper part, a filter element arranged in the barrel and an easily-opened filter head for sealing the opening, and the barrel is provided with a forward inlet, a forward outlet and a drain outlet. The upper end of the filter element extends to a position close to the opening, and the lower end of the filter element is communicated with the forward outlet through a forward outlet pipe; the gland and the base are arranged at the upper end and the lower end of the filter screen structure, the pull rod is used for fixing the filter element, and the reverse sewage collection cavity is formed in the filter screen structure. The bidirectional filtering system is additionally provided with an air inlet and outlet bypass, and the filtering direction is controlled by controlling a valve of a main bypass. According to the utility model, an internal filter element bidirectional filtering principle is adopted, so that the whole bidirectional filtering system keeps continuous filtering and is not influenced by one-way blockage.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering systems, in particular to a two-way filter for high-pressure methane hydrogen fuel gas and a two-way filtering system. Background Art

[0002] In the existing natural gas transmission pipeline network, filtration systems are often used to separate impurities in the fuel gas. The filters used in the filtration system are all made of carbon steel except the filter element. Hydrogen can easily cause hydrogen corrosion and cracking of carbon steel materials. The existing filters are not suitable for hydrogen-blended transportation.

[0003] In addition, after a certain period of use, impurities will clog the filter screen, seriously reducing the filtering effect. The common treatment method is to replace the filter element regularly, but the specific time is difficult to control and the replacement is accompanied by the consumption of material and labor costs.

[0004] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0005] The utility model provides a two-way filter and a two-way filtering system for high-pressure methane hydrogen fuel gas, which are used to solve the above problems.

[0006] A technical solution adopted by the utility model is to provide a two-way filter for high-pressure methane hydrogen fuel gas, comprising: a cylinder with an opening at the top, a filter element placed in the cylinder and an easy-to-open filter head for sealing the opening, the cylinder is provided with a forward inlet, a forward outlet and a sewage outlet, the upper end of the filter element extends to the vicinity of the opening, and the lower end of the filter element is connected to the forward outlet through a forward outlet pipe;

[0007] The filter element comprises a filter screen structure, a gland and a base arranged at the upper and lower ends of the filter screen structure, a pull rod for fixing the filter element, and a reverse dirt collecting cavity arranged in the filter screen structure.

[0008] Furthermore, the filter element is made of stainless steel, which is not easily corroded by hydrogen and has a longer service life during hydrogen blending and transportation.

[0009] Furthermore, a rubber sealing ring is provided between the base and the filter structure to ensure that impurities fall into the reverse dirt collecting chamber instead of the forward outlet pipe during reverse filtering.

[0010] Furthermore, the filter structure consists of an outer reinforced perforated plate and an inner filter, the outer reinforced perforated plate has evenly distributed punching holes for strengthening the filter element structure, and the inner filter consists of at least one layer of filter, the pore range of the filter is 5-20 μm.

[0011] Furthermore, the cylinder body is also provided with a flushing port, and the flushing port is connected with the forward outlet pipe.

[0012] Another technical solution adopted by the utility model is to provide a bidirectional filtering system for high-pressure methane hydrogen fuel gas, comprising: a forward air inlet valve, the above-mentioned bidirectional filter and a forward air outlet valve connected in sequence;

[0013] An intake bypass is provided from the front end of the forward intake valve to the front end of the forward outlet valve, and a reverse intake valve is provided on the intake bypass;

[0014] An outlet bypass is provided from the rear end of the forward air inlet valve to the rear end of the forward air outlet valve, and a reverse air outlet valve is provided on the outlet bypass;

[0015] When the system is filtering in the forward direction, the forward air inlet valve and the forward air outlet valve are opened, and the reverse air inlet valve and the reverse air outlet valve are closed, and the fuel gas enters from the forward inlet of the two-way filter, and is discharged from the forward outlet after being filtered, and the filtered impurities fall into the bottom of the two-way filter;

[0016] When the system is filtering in reverse, the forward air inlet valve and the forward air outlet valve are closed, the reverse air inlet valve and the reverse air outlet valve are opened, the fuel gas enters from the forward outlet of the two-way filter, is discharged from the forward inlet after filtering, and the filtered impurities fall into the reverse dirt collecting chamber.

[0017] Furthermore, it also includes a flushing bypass, one end of which is connected to the flushing port of the two-way filter, and the other end of which is connected to a water source;

[0018] When the system is reverse flushed, the forward air inlet valve and the reverse air inlet valve are closed, clean water enters the forward outlet pipe from the flushing port, flushes the filter structure, and impurities flow into the bottom of the two-way filter with the water flow and are discharged from the drain port. The filter is cleaned by reverse flushing, which solves the problem of filter blockage, extends the life of the filter element, and reduces replacement costs.

[0019] Furthermore, a flushing valve is provided on the flushing bypass, and when the system is filtering, the flushing valve is normally closed.

[0020] The utility model provides a two-way filter for high-pressure methane hydrogen fuel gas and a two-way filtering system with the following beneficial effects:

[0021] 1. Design a two-way filter with a reverse dirt collection chamber so that it can filter in both the forward and reverse directions. Reverse filtration can alleviate the problem of forward blockage and ensure that impurities are properly collected during reverse filtration.

[0022] 2. Design a two-way filtration system with inlet and outlet bypass. By controlling the filtering direction of the forward inlet and outlet valves and the reverse inlet and outlet valves, and the two-way filtration principle of the internal filter element, the overall two-way filtration system can maintain continuous filtration without being affected by one-way blockage, and the filter can be maintained in the best filtering state at all times. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a bidirectional filter for high-pressure methane hydrogen fuel gas in the first embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the filter element in the first embodiment of the utility model;

[0025] Figure 3 The first embodiment of the utility model is a two-way filtering system for high-pressure methane hydrogen fuel gas;

[0026] The components in the accompanying drawings are marked as follows: 1. Forward air inlet valve, 2. Two-way filter, 3. Forward air outlet valve, 4. Reverse air inlet valve, 5. Reverse air outlet valve, 6. Flushing valve, 21. Cylinder, 22. Filter element, 23. Easy-open filter head, 24. Forward inlet, 25. Forward outlet pipe, 26. Forward outlet, 221. Filter screen structure, 222. Pressure cover, 223. Base, 224. Pull rod, 225. Reverse dirt collecting chamber. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "horizontal", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention. They cannot indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] See also Figure 1 and Figure 2 The first embodiment of the utility model provides a two-way filter 2 for high-pressure methane hydrogen fuel gas, comprising: a cylinder 21 with an opening at the top, a filter element 22 placed in the cylinder 21 and an easy-to-open filter head 23 for sealing the opening;

[0030] The cylinder 21 is provided with a forward inlet 24, a forward outlet 26 and a sewage outlet, the forward inlet 24 is located on the left side, the forward outlet 26 is located on the right side, and the sewage outlet is located at the bottom of the cylinder 21;

[0031] The upper end of the filter element 22 extends to the vicinity of the opening, and the lower end of the filter element 22 is connected to the forward outlet 26 through the forward outlet pipe 25, and the forward outlet pipe 25 is designed to be L-shaped;

[0032] During forward filtering, the fuel gas enters from the forward inlet 24, is filtered by the filter element 22, and is discharged from the forward outlet 26, outputting clean fuel gas, while impurities fall into the bottom of the two-way filter 2;

[0033] During reverse filtering, the fuel gas enters from the forward outlet 26 (the forward outlet is equivalent to the reverse inlet), is filtered by the filter element 22, and is discharged from the forward inlet 24 (the forward inlet is equivalent to the reverse outlet), outputting clean fuel gas while impurities fall into the filter element 22.

[0034] Specifically, the cylinder 21 is also provided with a flushing port, which is located on the side and communicates with the forward outlet pipe 25;

[0035] During reverse flushing, the forward outlet 26 is closed, the drain outlet is opened, clean water enters from the flushing outlet to flush the filter element 22, and impurities flow into the bottom of the cylinder 21 with the water flow and are discharged from the drain outlet.

[0036] The filter element 22 is made of stainless steel, and the parts of the two-way filter 2 that are in contact with the hydrogen-doped fuel gas are all made of stainless steel. Stainless steel is not easily corroded by hydrogen and has a longer service life during hydrogen-doped transportation.

[0037] The filter element 22 includes a filter screen structure 221, a gland 222 and a base 223 disposed at the upper and lower ends of the filter screen structure 221, a pull rod 224 for fixing the filter element 22, and a reverse dirt collection chamber 225 disposed in the filter screen structure 221;

[0038] The filter structure 221 is composed of an outer reinforced perforated plate and an inner filter. The outer reinforced perforated plate has evenly distributed punching holes for strengthening the structural strength of the filter element 22. The inner filter consists of four layers of filter, which are stainless steel wire mesh with a pore size of 15 μm.

[0039] The pull rod 224 is arranged through the central axis of the filter element 22, the lower end of which is embedded in the wall of the positive outlet pipe 25, and the upper end of which extends out of the gland 222 and is locked with a lock nut to ensure the stability of the filter element 22 structure;

[0040] The reverse dirt collecting chamber 225 is an annular structure with an inner baffle, and is placed as a whole at the bottom of the filter element 22 . During reverse filtering, impurities will fall into the reverse dirt collecting chamber 225 .

[0041] Specifically, a rubber sealing ring is provided between the base 223 and the filter structure 221 to ensure that impurities fall into the reverse dirt collecting chamber 225 instead of the forward outlet pipe 25 during reverse filtering.

[0042] The first embodiment of the utility model provides a bidirectional filtering system for high-pressure methane hydrogen fuel gas, comprising: a forward air inlet valve 1, the above-mentioned bidirectional filter 2 and a forward air outlet valve 3 connected in sequence;

[0043] An intake bypass is provided from the front end of the forward intake valve 1 to the front end of the forward outlet valve 3, and a reverse intake valve 4 is provided on the intake bypass;

[0044] An outlet bypass is provided from the rear end of the forward air inlet valve 1 to the rear end of the forward air outlet valve 3, and a reverse air outlet valve 5 is provided on the outlet bypass;

[0045] It also includes a flushing bypass, one end of which is connected to the flushing port of the two-way filter 2, and the other end of which is connected to a water source;

[0046] When the system is filtering in the forward direction, the forward inlet valve 1 and the forward outlet valve 3 are opened, and the reverse inlet valve 4 and the reverse outlet valve 5 are closed. The fuel gas enters from the forward inlet 24 of the two-way filter 2, and is discharged from the forward outlet 26 after being filtered. The filtered impurities fall into the bottom of the cylinder 21 of the two-way filter 2. The system is filtering in the forward direction most of the time.

[0047] When the system performs reverse filtering, the forward air inlet valve 1 and the forward air outlet valve 3 are closed, and the reverse air inlet valve 4 and the reverse air outlet valve 5 are opened. The fuel gas enters from the forward outlet 26 of the two-way filter 2, and is discharged from the forward inlet 24 after filtering. The filtered impurities fall into the reverse dirt collecting chamber 225 of the filter element 22. The system performs reverse filtering intermittently, so that the impurities filtered in the forward direction can better fall into the bottom of the cylinder 21, so that the filter screen is often maintained in the best filtering state, so that the overall two-way filtering system maintains continuous filtering without being affected by unidirectional blockage;

[0048] When the system is reverse flushed, the forward air inlet valve 1 and the reverse air inlet valve 4 are closed, and clean water enters the forward outlet pipe 25 from the flushing port to flush the filter structure 221. Impurities flow into the bottom of the two-way filter 2 with the water flow and are discharged from the drain port. The filter is cleaned by reverse flushing to solve the problem of filter blockage, extend the life of the filter element 22, and reduce the replacement cost. After the overall filtration system adopts two-way filtration, the frequency of reverse flushing is also lower.

[0049] Back flushing method: the system needs to be shut down to complete the back flushing of the two-way filter 2 or the system needs to be equipped with two two-way filters 2, using a one-for-one method. When one of the two-way filters 2 is back flushed, the other two-way filter 2 ensures the normal filtration of the fuel gas. Therefore, the frequency of back flushing is reduced, which can effectively reduce downtime and reduce flushing maintenance costs.

[0050] Specifically, in the two-way filtration system, the parts in contact with the hydrogen-doped fuel gas are made of stainless steel to avoid cracking due to hydrogen corrosion.

[0051] The utility model provides a two-way filter for high-pressure methane hydrogen fuel gas and a two-way filtering system with the following beneficial effects:

[0052] 1. Design a two-way filter with a reverse dirt collection chamber so that it can filter in both the forward and reverse directions. Reverse filtration can alleviate the problem of forward blockage and ensure that impurities are properly collected during reverse filtration.

[0053] 2. Design a two-way filtration system with inlet and outlet bypass. By controlling the filtering direction of the forward inlet and outlet valves and the reverse inlet and outlet valves, and the two-way filtering principle of the internal filter element, the overall two-way filtration system can maintain continuous filtering without being affected by one-way blockage, and the filter screen can be maintained in the best filtering state regularly;

[0054] 3. In the two-way filter and two-way filtration system, the parts in contact with the hydrogen-doped fuel gas are made of stainless steel. Stainless steel is not easily corroded by hydrogen and has a longer service life during hydrogen-doped transportation.

[0055] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A two-way filter for high-pressure methane hydrogen fuel gas, characterized in that: include: A cylinder with an opening at the top, a filter element placed in the cylinder and an easy-open filter head for sealing the opening, the cylinder is provided with a forward inlet, a forward outlet and a sewage outlet, the upper end of the filter element extends to near the opening, and the lower end of the filter element is connected to the forward outlet through a forward outlet pipe; The filter element comprises a filter screen structure, a gland and a base arranged at the upper and lower ends of the filter screen structure, a pull rod for fixing the filter element, and a reverse dirt collecting cavity arranged in the filter screen structure.

2. A two-way filter for high-pressure methane hydrogen fuel gas according to claim 1, characterized in that: The filter element is made of stainless steel.

3. A two-way filter for high-pressure methane hydrogen fuel gas according to claim 2, characterized in that: A rubber sealing ring is also arranged between the base and the filter structure.

4. A two-way filter for high-pressure methane hydrogen fuel gas according to any one of claims 1 to 3, characterized in that: The filter screen structure consists of an outer reinforced perforated plate and an inner filter screen, wherein the outer reinforced perforated plate has evenly distributed punching holes, and the inner filter screen consists of at least one layer of filter screen.

5. A two-way filter for high-pressure methane hydrogen fuel gas according to claim 4, characterized in that: The pore size of the filter is in the range of 5-20 μm.

6. A two-way filter for high-pressure methane hydrogen fuel gas according to claim 4, characterized in that: The cylinder is also provided with a flushing port, which is communicated with the forward outlet pipe.

7. A two-way filtration system for high-pressure methane hydrogen fuel gas, characterized in that: include: A forward air inlet valve, the above-mentioned two-way filter and a forward air outlet valve connected in sequence; An intake bypass is provided from the front end of the forward intake valve to the front end of the forward outlet valve, and a reverse intake valve is provided on the intake bypass; An outlet bypass is provided from the rear end of the forward air inlet valve to the rear end of the forward air outlet valve, and a reverse air outlet valve is provided on the outlet bypass.

8. A two-way filtration system for high-pressure methane hydrogen fuel gas according to claim 7, characterized in that: It also includes a flushing bypass, one end of which is connected to the flushing port of the two-way filter, and the other end of which is connected to a water source.

9. A two-way filtration system for high-pressure methane hydrogen fuel gas according to claim 8, characterized in that: A flushing valve is arranged on the flushing bypass, and the flushing valve is normally closed when the system is filtering.

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