A solution filter flow control structure and desulfurization, dehydration or tail gas treatment device

Abstract

The utility model discloses a kind of solution filter flow control structure and desulfurization, dehydration or tail gas treatment device, it is related to solution filter flow control technical field, solution filter flow control structure includes filter and filter bypass pipeline, filter includes front filter and rear filter;Front filter is connected with inlet pipe and outlet pipe, first liquid control valve is connected on inlet pipe, second liquid control valve is connected on outlet pipe, the inlet of rear filter is communicated with the outlet pipe of front filter, second outlet pipe that is communicated with filter bypass pipeline is connected on rear filter;Flow regulating device is connected on filter bypass pipeline;First pressure lead pipe is connected between inlet pipe and outlet pipe, first differential pressure transmitter is connected on first pressure lead pipe;Second pressure lead pipe is connected between outlet pipe and pipeline, second differential pressure transmitter is connected on second pressure lead pipe;Front filter top is connected with pressure relief structure. Can automatically smooth adjustment solution filtration amount, avoid causing fluid flow fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of solution filter flow control technology, specifically to a solution filter flow control structure and a desulfurization, dehydration or exhaust gas treatment device. Background Technology

[0002] In desulfurization, dehydration, and tail gas treatment units of sulfur-containing natural gas purification plants, solution filtration systems are installed, including pre-filters, post-filters, and post-filters. Their main function is to filter out mechanical impurities and degradation products from the solution. The solution from the system passes through the pre-filter to remove mechanical impurities. 30%–40% of the filtered solution then flows through the pre-filter to adsorb degradation products. Finally, the solution filtered by the pre-filter enters the post-filter to remove activated carbon powder and other solid impurities, maintaining the cleanliness of the solution system.

[0003] For example, in desulfurization units, the amine process is typically used to remove acidic gases (H2S, CO2, etc.) from natural gas. The amine-rich solution, after absorbing the acidic gases, undergoes depressurization and flash evaporation before entering a solution mechanical filter and a pre-filter, and finally enters the regeneration system. During operation, the amine solution undergoes a series of processes including absorption, flash evaporation, filtration, heat exchange, regeneration, and cooling for recycling. During this process, pressure, temperature, and composition undergo drastic changes. The amine solution deteriorates and generates degradation products during use. The pre-filter is a crucial measure for removing deteriorated solutions and degradation products. Failure to use a pre-filter or its poor performance will lead to the accumulation of degradation products and deteriorated solutions in the amine solution, increasing the frequency of system foaming and liquid retention, resulting in substandard natural gas quality indicators and increased solution loss. It will also cause fluctuations in downstream sulfur recovery units.

[0004] Maintaining a relatively stable flow rate of solution passing through the pre-filter and a reasonable proportion of the solution volume to the total circulating solution volume are prerequisites and foundations for the stable operation of the pre-filter. Currently, the flow rate of solution entering the pre-filter is mainly controlled by a combination of valves and flow meters or by manual adjustment based on experience. However, both methods are prone to causing large fluctuations in fluid flow due to improper operation, leading to accidents such as interlocking shutdowns of production units and failure to meet the quality indicators of the natural gas product. In addition, the installation of flow meters and regulating valves requires consideration of the installation space for straight pipe sections before and after the flow meters and bypass valves for the regulating valves, significantly increasing the space occupied on site. Utility Model Content

[0005] The technical problem this invention aims to solve is that current filter solution flow control methods are prone to large fluctuations in fluid flow due to improper operation, leading to interlocking shutdowns of production units and failures to meet the quality standards of natural gas products. Based on this, this invention proposes a solution filter flow control structure and a desulfurization, dehydration, or tail gas treatment device. This achieves automatic and stable adjustment of the solution filtration volume based on changes in the total solution circulation volume and the differential pressure of the filter, while ensuring the required filtration volume is met. This avoids large fluctuations in fluid flow caused by improper operation, which could lead to interlocking shutdowns of production units.

[0006] This utility model is achieved through the following technical solution:

[0007] In a first aspect, this application provides a solution filter flow control structure, including a filter and a filter bypass pipeline. The filter includes a pre-filter and a post-filter. The pre-filter is connected to an inlet pipe and a first outlet pipe. A first liquid control valve is connected to the inlet pipe, and a second liquid control valve is connected to the first outlet pipe. The inlet of the post-filter is connected to the outlet pipe of the pre-filter. The post-filter is connected to a second outlet pipe that is connected to the filter bypass pipeline, and a third liquid control valve is connected to the second outlet pipe. A flow regulating device is connected to the filter bypass pipeline. A first pressure tap is connected between the inlet pipe and the first outlet pipe, and a first differential pressure transmitter is connected to the first pressure tap. A second pressure tap is connected between the first outlet pipe and the second outlet pipe, and a second differential pressure transmitter is connected to the second pressure tap. A pressure relief structure is connected to the top of the pre-filter.

[0008] The post-filter primarily filters out carbon powder from the pre-filter, reducing new contamination caused by the use of the pre-filter solution system.

[0009] Furthermore, the flow regulating device includes a flow restrictor plate connected to the filter bypass line, the flow restrictor plate being held in the middle by two flanges, the two flanges being fixed by a bolt assembly.

[0010] Because the solution contains corrosive media such as hydrogen sulfide, the orifice plate is made of a material resistant to hydrogen sulfide corrosion.

[0011] The flange size and type are determined based on the size of the pipeline, the wall thickness, and the pressure rating of the medium. The flange material is selected to be resistant to hydrogen sulfide corrosion.

[0012] Furthermore, metal spiral wound gaskets are installed on both sides of the flow-limiting orifice plate at the contact points with the flange.

[0013] The size and type of the spiral wound gasket are determined according to the type of flange and the pressure rating and physical properties of the medium.

[0014] Furthermore, a through hole is formed in the middle of the flow-limiting orifice plate.

[0015] Furthermore, the size of the through-hole is determined by the maximum differential pressure between the pre-filter and the post-filter and the solution circulation rate.

[0016] Furthermore, a first pressure tapping valve is connected to the first pressure tapping pipe near one end of the inlet pipe; a second pressure tapping valve is connected to the first pressure tapping pipe near one end of the first outlet pipe; a third pressure tapping valve is connected to the second pressure tapping pipe near one end of the first outlet pipe; and a fourth pressure tapping valve is connected to the second pressure tapping pipe near one end of the second outlet pipe.

[0017] Furthermore, activated carbon is installed in the middle of the pre-filter, and space is provided at the bottom and top for accommodating and buffering the solution entering and exiting the filter; the pressure relief structure includes a pressure relief pipe connected to the top of the pre-filter, and a front manual valve, a safety valve and a rear manual valve are connected to the pressure relief pipe.

[0018] Furthermore, the measured value of the first differential pressure transmitter will increase as the adsorbent in the activated carbon inside the filter increases. When the high alarm value is reached, an alarm will be triggered in the DSC system. When the measured value reaches the set maximum value, the pre-filter will be shut down and the activated carbon will be cleaned or replaced.

[0019] Furthermore, the post-filter includes a bag filter or a cartridge filter; a pressure relief pipe is connected to the second outlet pipe of the post-filter, and a manual valve is connected to the pressure relief pipe.

[0020] Furthermore, the measured value of the second differential pressure transmitter will increase as the adsorbent in the filter element increases. When the high alarm value is reached, an alarm will be triggered in the DSC system. When the measured value reaches the set maximum value, the filter will be stopped and the filter element will be cleaned or replaced.

[0021] Furthermore, the front manual valve, rear manual valve, first liquid control valve, second liquid control valve, third liquid control valve, and manual valve all include any one of ball valve, butterfly valve, gate valve, and stop valve; the first pressure tapping valve, second pressure tapping valve, third pressure tapping valve, and fourth pressure tapping valve are all any one of ball valve, needle valve, and stop valve.

[0022] The pre-filter contains a metal mesh and a mounting bracket to hold the activated carbon in place. Typically, the activated carbon is installed in the middle section of the filter, with space at the top and bottom to accommodate and buffer the solutions entering and exiting the filter.

[0023] Secondly, this application provides a desulfurization, dehydration, or exhaust gas treatment device, including the above-mentioned solution filter flow control structure.

[0024] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0025] (1) The solution filter flow control structure of this application realizes that the solution flowing through the filter in the natural gas purification plant can automatically and smoothly adjust the solution filtration volume according to the total solution circulation volume and the differential pressure value of the filter, while meeting the solution filtration volume requirements. This avoids the occurrence of interlocking shutdown accidents caused by large fluctuations in fluid flow due to improper operation.

[0026] (2) The solution filter flow control structure in this application does not require operation during operation, which greatly reduces the labor intensity of operators. At the same time, the structure is simple, occupies less installation space, and has lower procurement, modification and installation costs, which has great economic value. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of a solution filter flow control structure according to the present invention;

[0029] Figure 2 This is a schematic diagram of the installation structure of the flow-limiting orifice plate in this utility model;

[0030] Figure 3 This is a schematic diagram of the flow-limiting orifice plate in this utility model.

[0031] The attached diagram shows the markings and corresponding component names:

[0032] 01-Pre-filter, 02-First pressure tap, 03-First differential pressure transmitter, 04-First pressure tap valve, 05-Inlet pipe, 06-First liquid control valve, 07-Filter bypass line, 08-Flow regulating device, 09-Safety valve, 10-Rear manual valve, 11-Front manual valve, 12-First outlet pipe, 13-Second pressure tap valve, 14-Bolt assembly, 15-Flow limiting orifice plate, 16-Metal spiral wound gasket, 17-Flange, 18-Through hole, 19-Rear filter, 20-Second differential pressure transmitter, 21-Second outlet pipe, 22-Second liquid control valve, 23-Third pressure tap valve, 24-Fourth pressure tap valve, 25-Second pressure tap, 26-Third liquid control valve, 27-Manual valve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a joint, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Example 1

[0038] like Figures 1-3 As shown, this embodiment provides a solution filter flow control structure, including a filter and a filter bypass line 07. The filter includes a pre-filter 01 and a post-filter 19. The pre-filter 01 is connected to an inlet pipe 05 and a first outlet pipe 12. The inlet pipe 05 is connected to a first liquid control valve 06, and the first outlet pipe 12 is connected to a second liquid control valve 22. The inlet of the post-filter 19 is connected to the first outlet pipe 12 of the pre-filter 01, and the post-filter 19 is connected to a second outlet pipe 21 connected to the filter bypass line 07. A flow regulating device 08 is connected to the filter bypass line 07. A first pressure tap 02 is connected between the inlet pipe 05 and the first outlet pipe 12, and a first differential pressure transmitter 03 is connected to the first pressure tap 02. A second pressure tap 25 is connected between the first outlet pipe 12 and the second outlet pipe 21, and a second differential pressure transmitter 20 is connected to the second pressure tap 25. A pressure relief structure is connected to the top of the pre-filter 01.

[0039] Among them, the post-filter 19 mainly filters the carbon powder in the pre-filter 01, reducing new contamination caused by the use of the pre-filter solution system.

[0040] Specifically, the pre-filter 01 is an activated carbon filter. A metal mesh and a mounting bracket are installed inside the pre-filter to hold the activated carbon in place. Typically, the activated carbon is installed in the middle of the filter, with sufficient space at the top and bottom to accommodate and buffer the solution entering and exiting the filter.

[0041] Specifically, the post-filter 19 can be a filter cartridge or a bag filter.

[0042] Specifically, the flow regulating device 08 includes a flow restricting orifice plate 15 connected to the filter bypass pipeline 07. The flow restricting orifice plate 15 is clamped in the middle by two flanges 17, which are fixed by bolt assembly 14. To ensure the sealing between the flow restricting orifice plate 15 and the flanges 17, metal spiral wound gaskets 16 are installed at the contact points between the flow restricting orifice plate 15 and the flanges 17 on both sides. A through hole 18 is opened in the middle of the flow restricting orifice plate 15, with a cylindrical hole at the front end and a tapered hole at the rear end. Since the solution contains corrosive media such as hydrogen sulfide, the material of the flow restricting orifice plate 15 is selected to be resistant to hydrogen sulfide corrosion. The size and type of the flange 17 are determined according to the size of the pipeline, the wall thickness, and the pressure rating of the medium. The material of the flange 17 is selected to be resistant to hydrogen sulfide corrosion.

[0043] The inner hole of the flow-limiting orifice plate 15 is calculated as follows (taking a maximum filtration flow rate of 30%~40% of the total design solution circulation volume as an example; the range is adjustable):

[0044] With manual valve 11 fully open at the inlet and outlet of pre-filter 01 and under the premise of maximum design filtration flow, the inlet and outlet resistance of pre-filter 01 drops by ΔP1, which is the initial differential pressure value. The maximum allowable differential pressure value ΔP2 for pre-filter 01 during operation; the inlet and outlet resistance of post-filter 02 drops by ΔP3, which is the initial differential pressure value. The maximum allowable differential pressure value ΔP4 for post-filter 02 during operation;

[0045] The designed total solution circulation volume is 60%, and the calculated differential pressure of the flow-limiting orifice plate 15 is: ΔP2 + ΔP4 (1). (Considering that the maximum allowable differential pressure value is much greater than the initial differential pressure value, and the possibility of the pre-filter and post-filter reaching the maximum differential pressure at the same time is low, the initial differential pressure value ΔP1 + ΔP3 is ignored.)

[0046] The designed total solution circulation volume is 70%, and the calculated pressure difference for the flow-limiting orifice plate 15 is: ΔP1 + ΔP3 (2)

[0047] Using the standard orifice plate calculation formula, the orifice diameters d1 and d2 of the flow-limiting orifice plate 15 are calculated according to (1) and (2) respectively. The larger value is taken as the orifice diameter of the flow-limiting orifice plate 15. The outer diameter D of the flow-limiting orifice plate 15 is determined according to the size of the pipeline.

[0048] Specifically, a first pressure tapping valve 04 is connected to the first pressure tapping pipe 02 near the end of the inlet pipe 05; a second pressure tapping valve 13 is connected to the first pressure tapping pipe 02 near the end of the first outlet pipe 12; a third pressure tapping valve 23 is connected to the second pressure tapping pipe 22 near the end of the first outlet pipe 12; and a fourth pressure tapping valve 24 is connected to the second pressure tapping pipe 22 near the end of the second outlet pipe 21.

[0049] The first differential pressure transmitter 03 is a standard differential pressure transmitter used to measure the differential pressure in the activated carbon section of the pre-filter 01, and to determine the adsorption status of the activated carbon based on changes in the differential pressure. The positive pressure tap of the pre-filter 01 is located above the top of the activated carbon installation area within the pre-filter 01, and its negative pressure tap is located below the top of the activated carbon installation area within the pre-filter 01. The distance between the positive and negative pressure taps should cover an area exceeding the activated carbon installation area. Alternatively, the positive and negative pressure taps can be installed separately on the inlet and outlet pipelines.

[0050] The second differential pressure transmitter 20 is a standard differential pressure transmitter used to measure the differential pressure value of the filter element inside the post-filter 19, and to determine the adsorption status of the filter element based on changes in the differential pressure value. The positive pressure tap of the post-filter 19 is located at the front end where the filter element is installed, and its negative pressure tap is located at the rear end where the filter element is installed. The positive and negative pressure taps should be installed in different areas at the front and rear ends of the filter element. Alternatively, the positive and negative pressure taps can be installed separately on the inlet and outlet pipelines.

[0051] Specifically, the pressure relief structure includes a pressure relief pipe connected to the top of the front filter 01, to which a front manual valve 11, a safety valve 09, and a rear manual valve 10 are connected. The safety valve 09 is located between the front manual valve 11 and the rear manual valve 10. The rear filter 19 includes a bag filter or a cartridge filter; a pressure relief pipe is connected to the second outlet pipe 21 of the rear filter 19, and a manual valve 27 is connected to the pressure relief pipe. The front manual valve 11, the rear manual valve 10, the third liquid control valve 26, and the manual valve 27 are all ball valves, butterfly valves, gate valves, or stop valves. The first pressure tapping valve 04, the second pressure tapping valve 13, the third pressure tapping valve 23, and the fourth pressure tapping valve 24 are all ball valves, needle valves, or stop valves.

[0052] When this solution filter flow control structure is in operation, the solution flowing through the structure in the natural gas purification plant automatically and smoothly adjusts the solution filtration volume based on the total solution circulation volume and the differential pressure value of the upstream filter 01, while ensuring the required filtration volume. This avoids large fluctuations in fluid flow caused by improper operation, which could lead to interlocking shutdowns of the production unit. Moreover, this solution filter flow control structure requires no other operation during operation, greatly reducing the labor intensity of operators. In addition, the solution filter flow control structure is simple, occupies little installation space, and has lower procurement, modification, and installation costs, making it more economically valuable.

[0053] Example 2

[0054] This embodiment provides a solution filter flow control structure. Unlike Embodiment 1, this embodiment is a single filter structure, including only a pre-filter 01 or a post-filter 19. Other structures are the same as in Embodiment 1.

[0055] Taking filter 01 as an example, the inner hole calculation of the flow-limiting orifice plate 15 is as follows (taking the maximum filtration flow rate as 30%~40% of the total design solution circulation volume as an example, the range value is adjustable):

[0056] With manual valve 11 fully open at the inlet and outlet of pre-filter 01 and under the premise of maximum design filtration flow, the inlet and outlet resistance drop of pre-filter 01 is ΔP1, which is the initial differential pressure value. The maximum allowable differential pressure value ΔP2 for pre-filter 01 during operation;

[0057] The total circulating volume of the solution is designed to be 60%, and the pressure difference calculated by the flow-limiting orifice plate 15 is: ΔP2 (1).

[0058] The designed total solution circulation volume is 70%, and the calculated pressure difference for the flow-limiting orifice plate 15 is: ΔP1 (2)

[0059] Using the standard orifice plate calculation formula, the orifice diameters d1 and d2 of the flow-limiting orifice plate 15 are calculated according to (1) and (2) respectively. The larger value is taken as the orifice diameter of the flow-limiting orifice plate 15. The outer diameter D of the flow-limiting orifice plate 15 is determined according to the size of the pipeline.

[0060] Compared with Example 1, the solution filter flow control structure in this embodiment can also achieve the effect of smoothly adjusting the solution filtration volume, but it is suitable for single filter applications and has a wider range of applications.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A solution filter flow control structure, characterized in that, Includes a filter and a filter bypass line (07). The filter includes a pre-filter (01) and a post-filter (19). The pre-filter (01) is connected to an inlet pipe (05) and a first outlet pipe (12). The inlet pipe (05) is connected to a first liquid control valve (06), and the outlet pipe (12) is connected to a second liquid control valve (22). The inlet of the post-filter (19) is connected to the outlet pipe (12) of the pre-filter (01), and the post-filter (19) is connected to a second outlet pipe (21) connected to the filter bypass line (07). A third liquid control valve (26) is connected to the second outlet pipe (21); a flow regulating device (08) is connected to the filter bypass line (07); a first pressure tap (02) is connected between the inlet pipe (05) and the outlet pipe (12), and a first differential pressure transmitter (03) is connected to the first pressure tap (02); a second pressure tap (25) is connected between the outlet pipe (12) and the second outlet pipe (21), and a second differential pressure transmitter (20) is connected to the second pressure tap (25); a pressure relief structure is connected to the top of the front filter (01).

2. The solution filter flow control structure according to claim 1, characterized in that, The flow regulating device (08) includes a flow restrictor plate (15) connected to the filter bypass line (07), the flow restrictor plate (15) being held in the middle by two flanges (17), the two flanges (17) being fixed by a bolt assembly (14).

3. The solution filter flow control structure according to claim 2, characterized in that, Metal spiral wound gaskets (16) are installed on both sides of the flow restrictor plate (15) at the contact points with the flange (17).

4. The solution filter flow control structure according to claim 2, characterized in that, A through hole (18) is provided in the middle of the flow-limiting orifice plate (15).

5. The solution filter flow control structure according to claim 4, characterized in that, The size of the through hole (18) is determined by the maximum differential pressure of the front filter (01) and the rear filter (19) and the solution circulation rate.

6. The solution filter flow control structure according to claim 1, characterized in that, A first pressure tapping valve (04) is connected to the first pressure tapping pipe (02) near one end of the inlet pipe (05); a second pressure tapping valve (13) is connected to the first pressure tapping pipe (02) near one end of the outlet pipe (12); a third pressure tapping valve (23) is connected to the second pressure tapping pipe (25) near one end of the outlet pipe (12); and a fourth pressure tapping valve (24) is connected to the second pressure tapping pipe (25) near one end of the second outlet pipe (21).

7. The solution filter flow control structure according to claim 6, characterized in that, Activated carbon is installed in the middle of the pre-filter (01), and space is left at the bottom and top for accommodating and buffering the solution entering and exiting the filter; the pressure relief structure includes a pressure relief pipe connected to the top of the pre-filter (01), and a front manual valve (11), a safety valve (09) and a rear manual valve (10) are connected to the pressure relief pipe.

8. The solution filter flow control structure according to claim 1, characterized in that, The post-filter (19) includes a bag filter or a cartridge filter; a pressure relief pipe is connected to the second outlet pipe (21) of the post-filter (19), and a manual valve (27) is connected to the pressure relief pipe.

9. The solution filter flow control structure according to claim 7, characterized in that, The front manual valve (11), rear manual valve (10), first liquid control valve (06), second liquid control valve (22), third liquid control valve (26), and manual valve (27) all include any one of ball valve, butterfly valve, gate valve, and stop valve; the first pressure tapping valve (04), second pressure tapping valve (13), third pressure tapping valve (23), and fourth pressure tapping valve (24) are all any one of ball valve, needle valve, and stop valve.

10. A desulfurization, dehydration, or tail gas treatment device, characterized in that, Includes the solution filter flow control structure according to any one of claims 1 to 9.

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