A flash tower differential pressure measuring device and desulfurization system

Abstract

The utility model discloses a flash tower differential pressure measuring device and desulfurization system, the flash tower differential pressure measuring device includes flash element, filler column, measurement module and platform, the top of flash element is provided with filler column and measurement module, and the filler column is connected with flash gas pipe, and the flash gas pipe has the horizontal section close to and parallel to flash element, the top of flash element is equipped with positive pressure tapping, and the horizontal section of flash gas pipe is equipped with negative pressure tapping, and measurement module is connected with positive pressure tapping and negative pressure tapping respectively, and positive pressure tapping and negative pressure tapping are adjacent setting, platform sets up at the top of flash element, and the horizontal section of flash gas pipe is installed on the platform, the desulfurization system includes the flash tower differential pressure measuring device. The measurement module is set at the top of flash element, and then the residual liquid can flow back under the action of gravity, and the gas-liquid mixing phenomenon in the measurement module is eliminated. The direct connection of measurement module and filler column is cancelled, so that there is no shielding structure around the filler column, and the maintenance operation is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of flash tower differential pressure measurement technology, specifically to a flash tower differential pressure measurement device and a desulfurization system. Background Technology

[0002] Raw natural gas undergoes desulfurization and dehydration to become finished natural gas for export. The desulfurization unit removes hydrogen sulfide, organic sulfur compounds, and some carbon dioxide from the raw natural gas, making it a key component for ensuring the qualified export of finished natural gas. The selective organic sulfur removal solvent used in the desulfurization unit is a chemical-physical solvent, a process that removes hydrogen sulfide, carbon dioxide, and organic sulfides from natural gas using a solution composed of a chemical solvent (amines) and a physical solvent. This solvent is recycled through processes such as flash evaporation, filtration, and regeneration. Desulfurization units are commonly used to achieve natural gas desulfurization, industrial process gas desulfurization, and qualified tail gas discharge, and are widely applied in industries such as petroleum, chemical, and thermal power generation.

[0003] During operation, the differential pressure of the flash evaporator is measured by a differential pressure measuring device. Changes in differential pressure can reflect the gas-liquid balance state, operational stability, and the presence of any abnormalities within the tower, ensuring its normal operation and product quality.

[0004] The use of differential pressure measuring devices in the prior art has the following drawbacks:

[0005] 1. Inaccurate differential pressure measurement makes it difficult to accurately reflect the operating status of the flash tower.

[0006] 2. Differential pressure measuring devices are often connected to the packing column of the flash tower, which increases the difficulty of maintaining the packing column. Utility Model Content

[0007] The technical problem to be solved by this utility model is that the existing differential pressure measuring devices are inaccurate and affect the maintenance of the packing column. The purpose is to provide a differential pressure measuring device for flash towers and a desulfurization system to solve the above problems.

[0008] This utility model is achieved through the following technical solution:

[0009] In the first aspect, this utility model provides a flash tower differential pressure measuring device, including a flash element, a packing column, a measuring module, and a platform;

[0010] A packing column and a measuring module are installed on the top of the flash evaporator. A flash vapor tube is connected to the packing column, and the flash vapor tube has a horizontal section that is adjacent to and parallel to the flash evaporator.

[0011] The top of the flash unit is provided with a positive pressure tap, and the horizontal section of the flash tube is provided with a negative pressure tap. The measurement module is connected to the positive pressure tap and the negative pressure tap respectively, and the positive pressure tap and the negative pressure tap are arranged adjacent to each other.

[0012] The platform is set on top of the flash unit, and the horizontal section of the flash tube is installed on the platform.

[0013] In one possible design, the distance between the positive pressure tap and the negative pressure tap is the minimum straight-line distance.

[0014] In one possible design, the measurement module includes a differential pressure transmitter, a positive sampling tube, a negative sampling tube, and a valve assembly.

[0015] The differential pressure transmitter is installed above the top of the flash tank;

[0016] One end of the positive sampling tube is connected to the positive pressure tap, and the other end is connected to the differential pressure transmitter; one end of the negative sampling tube is connected to the negative pressure tap, and the other end is connected to the differential pressure transmitter.

[0017] The positive sampling tube and the negative sampling tube are connected by a valve assembly.

[0018] In one possible design, the positive and negative sampling tubes are vertically arranged and bagless, and correspondingly, the differential pressure transmitter, positive sampling tube, and negative sampling tube are constructed in a Z-shape.

[0019] In one possible design, the valve manifold can be a three-valve manifold or a five-valve manifold.

[0020] In one possible design, pressure tapping valves are provided on both the positive and negative sampling tubes.

[0021] In one possible design, both the positive and negative sampling tubes are made of stainless steel, and the pressure tapping valve is a ball valve.

[0022] In one possible design, the flash tube includes an outlet section, a vertical section, a horizontal section, and an outlet section connected in sequence. One end of the outlet section is connected to the top of the packing column, and the other end of the outlet section is bent and connected to the vertical section. The vertical section is parallel to the packing column and extends downward. The horizontal section is adjacent to and parallel to the flash element. The outlet section is used to connect to other systems.

[0023] In one possible design, the horizontal segment is set on the platform and located near the edge of the platform.

[0024] In one possible design, the flash evaporator can be a flash tank or a flash tower.

[0025] Secondly, this utility model provides a desulfurization system, including the aforementioned flash tower differential pressure measuring device.

[0026] One possible design also includes a desulfurization absorption tower, a desulfurization regeneration tower, and system equipment;

[0027] The bottom of the desulfurization absorption tower is fed to the flash element of the differential pressure measuring device of the flash tower, and the flash element feeds the rich liquid to the system equipment; the top of the desulfurization absorption tower outputs wet purified gas.

[0028] The bottom of the desulfurization regeneration tower delivers lean liquor to the system equipment, while the top of the desulfurization regeneration tower outputs regenerated acid gas.

[0029] The system equipment delivers lean liquor to the packing column of the differential pressure measuring device in the flash tower and to the top of the desulfurization absorption tower, and delivers rich liquor to the top of the desulfurization regeneration tower.

[0030] In one possible design, the inlet of the desulfurization absorption tower is fed with raw natural gas.

[0031] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0032] By placing the measurement module on top of the flash evaporator, the residual liquid can flow back under gravity, preventing liquid from remaining in the measurement module and eliminating the gas-liquid mixing phenomenon. This solves the problem of inaccurate measurement caused by the liquid mixing, making the measurement results of the measurement module more accurate and reliable.

[0033] The direct connection between the measurement module and the packing column has been eliminated, allowing the measurement module to be located away from the packing column. This eliminates any obstructions around the packing column, making maintenance easier.

[0034] The short distance between the positive and negative pressure taps reduces the length of related pipelines, saving on pipe materials and valve bodies, thereby significantly reducing material costs and making the flash tower differential pressure measuring device more economical. Attached Figure Description

[0035] 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:

[0036] Figure 1 This is a schematic diagram of a desulfurization system.

[0037] Figure 2 This is a schematic diagram of a differential pressure measuring device for a flash tower.

[0038] Figure 3 This is a schematic diagram of the measurement module.

[0039] The attached diagram shows the markings and corresponding component names:

[0040] 1. Flash vaporizer; 101. Positive pressure tap; 2. Packing column; 3. Measurement module; 301. Differential pressure transmitter; 302. Positive sampling tube; 303. Negative sampling tube; 304. Valve assembly; 305. Pressure tap valve; 4. Flash vaporizer; 401. Outlet section; 402. Vertical section; 403. Horizontal section; 404. Outlet section; 405. Negative pressure tap; 5. Desulfurization absorption tower; 6. Desulfurization regeneration tower; 7. System equipment; 8. Platform. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0042] Example:

[0043] Existing differential pressure measuring devices are prone to gas-liquid mixing during use, especially in intermediate connecting pipelines. The liquid remaining in the differential pressure measuring device affects its measurement accuracy. In addition, the differential pressure measuring device is physically connected to the packing column 2, and the differential pressure measuring device can become an obstruction during the maintenance of the packing column 2, increasing the difficulty of maintenance work.

[0044] To address this, the structure is improved and a differential pressure measuring device for flash towers is proposed, specifically:

[0045] like Figures 1-3 As shown, in a first aspect, this utility model provides a flash tower differential pressure measuring device, including a flash element 1, a packing column 2, a measuring module 3, and a platform 8;

[0046] A packing column 2 and a measuring module 3 are provided on the top of the flash evaporator 1. A flash vapor tube 4 is connected to the packing column 2. The flash vapor tube 4 has a horizontal section 403 that is adjacent to and parallel to the flash evaporator 1.

[0047] The top of the flash evaporator 1 is provided with a positive pressure tap 101, and the horizontal section 403 of the flash evaporator tube 4 is provided with a negative pressure tap 405. The measuring module 3 is connected to the positive pressure tap 101 and the negative pressure tap 405 respectively, and the positive pressure tap 101 and the negative pressure tap 405 are arranged adjacent to each other.

[0048] Platform 8 is set on top of flash evaporator 1, and the horizontal section 403 of flash evaporator 4 is installed on platform 8.

[0049] In the aforementioned flash tower differential pressure measuring device, on the one hand, by placing the measuring module 3 at the top of the flash element 1, the residual liquid can flow back under gravity, preventing liquid from remaining in the measuring module 3 and eliminating the gas-liquid mixing phenomenon. This solves the problem of inaccurate measurement caused by the liquid mixing, making the measurement results of the measuring module 3 more accurate and reliable. On the other hand, the direct connection between the measuring module 3 and the packing column 2 is eliminated, allowing the measuring module 3 to be located away from the packing column 2. This eliminates any obstructing structures around the packing column 2, making maintenance more convenient.

[0050] By setting up platform 8, the flash vapor pipe 4 is prevented from being suspended, which helps to improve work efficiency and equipment safety. It is easy to understand that platform 8 can be constructed in any suitable shape, and this utility model does not impose any restrictions on it.

[0051] Furthermore, the close distance between the positive pressure tap 101 and the negative pressure tap 405 reduces the length of related pipelines, saving on pipe materials and valve bodies and other components, thereby significantly reducing material costs and making the flash tower differential pressure measuring device more economical.

[0052] During operation, valve group 304 and pressure tapping valve 305 are opened respectively, and measurement module 3 is started. Flash vapor at the top of flash component 1 and flash vapor in horizontal section 403 flow into measurement module 3, causing the differential pressure transmitter 301 in measurement module 3 to gradually bear pressure in the positive and negative pressure measurement chambers, thereby realizing differential pressure measurement of packing column 2.

[0053] Optionally, the distance between the positive pressure tap 101 and the negative pressure tap 405 is the minimum straight-line distance. Based on this, a clear distance range is provided for the distance between the positive pressure tap 101 and the negative pressure tap 405, ensuring that staff can quickly determine the specific distance value while ensuring safety, thus improving the speed and convenience of the design.

[0054] In one possible implementation, the measurement module 3 includes a differential pressure transmitter 301, a positive sampling tube 302, a negative sampling tube 303, and a valve group 304.

[0055] The differential pressure transmitter 301 is installed above the top of the flash tank;

[0056] One end of the positive sampling tube 302 is connected to the positive pressure tap 101, and the other end of the positive sampling tube 302 is connected to the differential pressure transmitter 301; one end of the negative sampling tube 303 is connected to the negative pressure tap 405, and the other end of the negative sampling tube 303 is connected to the differential pressure transmitter 301.

[0057] The positive sampling tube 302 and the negative sampling tube 303 are connected by a valve assembly 304.

[0058] Based on the above design, the differential pressure transmitter 301 is used to measure the differential pressure of the packing column 2 on the flash element 1. It can be any suitable existing model, offering a wide selection range to adapt to different operating conditions and providing good practicality. The positive sampling tube 302 and the negative sampling tube 303 respectively deliver flash vapor from the flash element 1 and the packing column 2 to the differential pressure transmitter 301, thus providing the measuring gas for the differential pressure transmitter 301. The valve group 304 is used to control the flow of flash vapor, providing operational isolation and pressure balance, and facilitating the maintenance of the differential pressure transmitter 301.

[0059] Optionally, the positive sampling tube 302 and the negative sampling tube 303 are respectively arranged vertically and without bags. Correspondingly, the differential pressure transmitter 301, the positive sampling tube 302, and the negative sampling tube 303 are constructed in a Z-shape. Based on the above design scheme, the bagless shape avoids the formation of "U"-shaped (liquid bag) or "n"-shaped (gas bag) pipeline structures. See [reference needed]. Figure 3 The differential pressure transmitter 301, the positive sampling tube 302, and the negative sampling tube 303 are constructed in a Z-shape to prevent liquid residue in the positive sampling tube 302 and / or the negative sampling tube 303 and to ensure that the liquid can flow back.

[0060] Optionally, valve assembly 304 can be a three-valve assembly or a five-valve assembly. Based on this, the three-valve assembly has a simpler structure, while the five-valve assembly adds sewage discharge capacity to the three-valve assembly. Those skilled in the art can choose between the three-valve assembly and the five-valve assembly according to the actual working conditions, making it flexible in use.

[0061] In one possible implementation, pressure tapping valves 305 are respectively provided on the positive sampling tube 302 and the negative sampling tube 303. Based on this, outside of the valve group 304, the on / off state of the corresponding sampling tube is controlled by the pressure tapping valves 305 to realize the transmission and isolation of the medium pressure signal, and can cooperate with the valve group 304 to facilitate the maintenance, repair and fault diagnosis of the measurement module 3.

[0062] Optionally, both the positive sampling tube 302 and the negative sampling tube 303 are made of stainless steel, and the pressure tapping valve 305 is a ball valve. It is easy to understand that the sampling tubes can also be made of any other suitable material, and the pressure tapping valve 305 can also be any other suitable existing model.

[0063] In one possible implementation, the flash evaporator 4 includes an outlet section 401, a vertical section 402, a horizontal section 403, and the outlet section 401 connected in sequence. One end of the outlet section 401 is connected to the top of the packing column 2, and the other end of the outlet section 401 is bent and connected to the vertical section 402. The vertical section 402 is parallel to the packing column 2 and extends downward. The horizontal section 403 is adjacent to and parallel to the flash evaporator 1. The outlet section 401 is used to connect to other systems.

[0064] Based on the above design, the vertical section 402 is supported by the packing column 2 and extends downward to the flash element 1 to form a horizontal section 403 located above the flash element 1; the horizontal section 403 is supported by the top platform of the flash element 1 and extends horizontally along the top of the flash element 1, so that the negative pressure tap 405 is close to the flash element 1 and is connected to any other suitable existing system such as the fuel gas system through the outlet section 401.

[0065] Optionally, the horizontal segment 403 is positioned on the platform 8 and near its edge. Alternatively, depending on the actual usage effect, the horizontal segment 403 can be positioned at any suitable location on the platform 8 to obtain better measurement results.

[0066] In one possible implementation, the flash evaporator 1 is selected as a flash tank or flash tower. Based on the above design, the flash tank is equipped with trays, packing, and other components, enabling it to perform distillation. In this case, the flash tank is also used as a flash tower. It is readily understood that those skilled in the art can select a flash tank or flash tower according to actual operating conditions, and this utility model does not impose any limitations in this regard.

[0067] Secondly, this utility model provides a desulfurization system, including the aforementioned flash tower differential pressure measuring device. Based on this, the desulfurization system can also include other suitable functional modules in addition to the flash tower differential pressure measuring device, resulting in richer functionality to meet different operational requirements and improved practicality. Furthermore, it is readily understood that any suitable existing equipment can be selected for these functional modules, offering a wide range of choices.

[0068] Optionally, such as Figure 1 As shown, the desulfurization system also includes a desulfurization absorption tower 5, a desulfurization regeneration tower 6, and system equipment 7.

[0069] The bottom of the desulfurization absorption tower 5 is fed to the flash element 1 of the differential pressure measuring device of the flash tower, and the flash element 1 is fed to the system equipment 7; the top of the desulfurization absorption tower 5 outputs wet purified gas.

[0070] The bottom of the desulfurization regeneration tower 6 is used to transport lean liquor to system equipment 7, and the top of the desulfurization regeneration tower 6 is used to output regenerated acid gas.

[0071] System equipment 7 delivers lean liquor to the packing column 2 of the flash tower differential pressure measuring device and the top of the desulfurization absorption tower 5, respectively, and delivers rich liquor to the top of the desulfurization regeneration tower 6.

[0072] In this process, sulfur-containing natural gas and desulfurization solvent undergo desulfurization through countercurrent gas-liquid contact in the desulfurization absorption tower 5. Under high pressure and low temperature conditions, the desulfurization solvent absorbs the acidic components in the natural gas. The amine liquid that absorbs the acidic components is called rich amine liquid (also simply called rich liquid). After exiting the desulfurization absorption tower 5, the rich amine liquid enters the flashing element 1 of the differential pressure measuring device of the flashing tower, where most of the hydrocarbon gases dissolved in the solution are flashed out. Then, the flashed rich amine liquid enters the system equipment 7.

[0073] System equipment 7 includes components such as a pre-filter, activated carbon filter, post-filter, and lean-rich liquid heat exchanger. After filtering, heat exchange, and cooling the rich amine liquid, it enters the top of the desulfurization regeneration tower 6 for regeneration. The flash vapor generated in the flash evaporator 1 flows upward within the packed column 2, counter-currently contacting the lean amine liquid flowing downward, removing H2S and some CO2 gas from the flash vapor until the H2S content of the flash vapor meets the standard. After pressure regulation, the flash vapor enters the fuel gas system for use as fuel.

[0074] The desulfurization regeneration tower 6 removes sulfur dioxide from the rich amine liquid through the absorbent and generates lean amine liquid (also referred to as lean liquid) at the bottom of the tower. The lean amine liquid enters the system equipment 7 and undergoes filtration, heat exchange and other operations before entering the desulfurization absorption tower 5. The desulfurization is carried out by the desulfurization absorption tower 5 and purified gas is generated.

[0075] It is readily understood that the desulfurization absorption tower 5 and the desulfurization regeneration tower 6 can each be selected from any suitable existing models, and this utility model does not impose any restrictions in this regard. The system equipment 7 is used for filtration, heat exchange, cooling, etc., and it can be selected from any suitable existing equipment. Furthermore, there are connecting pipelines, valves, etc. between the desulfurization absorption tower 5, the desulfurization regeneration tower 6, the system equipment 7, and the aforementioned flash tower differential pressure measuring device. Those skilled in the art know how to select, connect, and operate these components, and will not elaborate further here.

[0076] Optionally, raw natural gas is introduced into the inlet of the desulfurization absorption tower 5. Based on this, the raw natural gas enters the desulfurization system via the desulfurization absorption tower 5, thereby removing hydrogen sulfide, organic sulfur, and some carbon dioxide.

[0077] 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 differential pressure measuring device for a flash evaporator, characterized in that, It includes a flash evaporator (1), a packing column (2), a measuring module (3), and a platform (8); A packing column (2) and a measuring module (3) are provided on the top of the flash evaporator (1). A flash steam pipe (4) is connected to the packing column (2). The flash steam pipe (4) has a horizontal section (403) adjacent to and parallel to the flash evaporator (1). The top of the flash evaporator (1) is provided with a positive pressure tap (101), and the horizontal section (403) of the flash evaporator (4) is provided with a negative pressure tap (405). The measuring module (3) is connected to the positive pressure tap (101) and the negative pressure tap (405) respectively, and the positive pressure tap (101) and the negative pressure tap (405) are arranged adjacent to each other. Platform (8) is set on top of flash evaporator (1), and the horizontal section (403) of flash evaporator (4) is installed on platform (8).

2. The flash tower differential pressure measuring device according to claim 1, characterized in that, The distance between the positive pressure tap (101) and the negative pressure tap (405) is the minimum straight-line distance.

3. The flash tower differential pressure measuring device according to claim 1, characterized in that, The measurement module (3) includes a differential pressure transmitter (301), a positive sampling tube (302), a negative sampling tube (303), and a valve group (304). The differential pressure transmitter (301) is installed above the top of the flash tank; One end of the positive sampling tube (302) is connected to the positive pressure tap (101), and the other end of the positive sampling tube (302) is connected to the differential pressure transmitter (301); one end of the negative sampling tube (303) is connected to the negative pressure tap (405), and the other end of the negative sampling tube (303) is connected to the differential pressure transmitter (301). The positive sampling tube (302) and the negative sampling tube (303) are connected by a valve assembly (304).

4. The flash tower differential pressure measuring device according to claim 3, characterized in that, The positive sampling tube (302) and the negative sampling tube (303) are respectively set vertically and are bagless. Correspondingly, the differential pressure transmitter (301), the positive sampling tube (302) and the negative sampling tube (303) are constructed in a Z-shape.

5. The flash tower differential pressure measuring device according to claim 3, characterized in that, The valve assembly (304) is selected as a three-valve assembly or a five-valve assembly.

6. The flash tower differential pressure measuring device according to claim 3, characterized in that, Pressure tapping valves (305) are provided on the positive sampling tube (302) and the negative sampling tube (303).

7. The flash tower differential pressure measuring device according to claim 6, characterized in that, Both the positive sampling tube (302) and the negative sampling tube (303) are made of stainless steel, and the pressure tapping valve (305) is a ball valve.

8. The flash tower differential pressure measuring device according to any one of claims 1-7, characterized in that, The flash vapor tube (4) includes an outlet section (401), a vertical section (402), a horizontal section (403), and an outlet section (401) connected in sequence. One end of the outlet section (401) is connected to the top of the packing column (2), and the other end of the outlet section (401) is bent and connected to the vertical section (402). The vertical section (402) is parallel to the packing column (2) and extends downward. The horizontal section (403) is adjacent to and parallel to the flash vaporizer (1). The outlet section (401) is used to connect to other systems.

9. The flash tower differential pressure measuring device according to claim 8, characterized in that, The horizontal segment (403) is set on the platform (8) and located near the edge of the platform (8).

10. The flash tower differential pressure measuring device according to any one of claims 1-7, characterized in that, Flash evaporator (1) can be a flash tank or flash tower.

11. A desulfurization system, characterized in that, The device includes the flash tower differential pressure measuring device according to any one of claims 1-10.

12. The desulfurization system according to claim 11, characterized in that, It also includes a desulfurization absorption tower (5), a desulfurization regeneration tower (6), and system equipment (7); The bottom of the desulfurization absorption tower (5) is used to transport rich liquid to the flash element (1) of the differential pressure measuring device of the flash tower, and the flash element (1) is used to transport rich liquid to the system equipment (7); the top of the desulfurization absorption tower (5) outputs wet purified gas. The bottom of the desulfurization regeneration tower (6) is used to transport lean liquid to the system equipment (7), and the top of the desulfurization regeneration tower (6) is used to output regenerated acid gas. The system equipment (7) respectively delivers lean liquid to the packing column (2) of the flash tower differential pressure measuring device and the top of the desulfurization absorption tower (5), and delivers rich liquid to the top of the desulfurization regeneration tower (6).

13. The desulfurization system according to claim 12, characterized in that, The inlet of the desulfurization absorption tower (5) is fed with raw natural gas.

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