A flushing device and system for a desulfurization equipment liquid level meter pressure lead pipe section

Abstract

The present application belongs to the technical field of natural gas purification, and specifically discloses a kind of flushing device and system for liquid level meter pressure lead pipe section of desulfurization equipment, including flushing flange and pressure lead pipeline, and the top and bottom of flushing flange are respectively provided with upper sealing surface and lower sealing surface;Multiple mounting holes are formed in the end of flushing flange;Pressure lead pipeline is set from the outside to the inside of flushing flange, and multiple spray holes are formed in the inside of flushing flange where pressure lead pipeline is located;Lower pressure lead pipe section is communicated with the lower part of desulfurization equipment, upper pressure lead pipe section and liquid inlet are communicated with the upper part of desulfurization equipment, double-flange liquid level meter includes differential pressure transmitter, capillary and two diaphragm flanges, two diaphragm flanges are connected with differential pressure transmitter through capillary respectively;Two diaphragm flanges are connected with upper pressure lead pipe section and lower pressure lead pipe section respectively;Flushing flange is connected between two diaphragm flanges and upper pressure lead pipe section and lower pressure lead pipe section.The end of equipment pressure lead pipe section can be flushed, and blockage can be avoided.

Description

Technical Field

[0001] This invention relates to the field of natural gas purification technology, specifically to a flushing device and system for the pressure tapping pipe section of a desulfurization equipment level gauge. Background Technology

[0002] Natural gas, as a high-quality, efficient, clean, and low-carbon energy source, is gradually increasing its share in China's primary energy consumption. It holds significant strategic importance for adjusting China's energy structure, improving people's living standards, promoting energy conservation and emission reduction, and addressing climate change. Currently, complexed iron desulfurization technology is gradually becoming a new application scenario for natural gas desulfurization in the field.

[0003] In natural gas purification technologies, particularly those involving the use of complexed iron desulfurization technology for high-pressure sulfur-containing natural gas treatment and low-pressure acid gas absorption from single-well sulfur-containing gas, key equipment such as the absorption tower, flash tank, and sulfur foam tank of the natural gas complexed iron desulfurization unit are all equipped with dual-flange level gauges. Based on the differential pressure principle, the dual-flange level gauge typically consists of two flanges, one connected to the upper gas phase pressure tapping section and flange, and the other to the lower liquid phase pressure tapping section and flange. This ensures that the level on the gauge always matches the level inside the container.

[0004] However, due to the tendency of sulfur paste to accumulate in the complexed iron solution, blockages frequently occur in the gas and liquid phase pressure tapping pipes. This leads to discrepancies between the data transmitted to the DCS system in the central control room and the actual liquid level, causing false liquid level readings from the dual-flange level gauges. This increases the potential safety risks of the unit, and in severe cases, it can trigger the SIS system interlock conditions, causing unplanned shutdowns, resulting in natural gas venting and combustion, leading to energy waste and environmental pollution. This has extremely adverse effects on the long-term operation of the complexed iron desulfurization unit and the supply of clean energy. Summary of the Invention

[0005] This invention provides a flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge, which aims to flush the end of the pressure tapping pipe section of the equipment to avoid blockage, thereby improving the accuracy and effectiveness of the level gauge of the complex iron desulfurization equipment.

[0006] The present invention is achieved through the following technical solution: a flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge, comprising a flushing flange and a pressure tapping pipeline, wherein the top and bottom ends of the flushing flange are respectively provided with an upper sealing surface and a lower sealing surface;

[0007] The flushing flange has multiple circumferentially distributed mounting holes at its end; the pressure-sensing pipeline runs through the flushing flange from the outside to the inside, and the portion of the pressure-sensing pipeline located on the inside of the flushing flange has multiple spray holes.

[0008] Compared with existing technologies, this solution has the following advantages and beneficial effects:

[0009] In practical application, the flushing device in this scheme can be installed between the flange of the pressure tapping pipe section of the desulfurization equipment and the diaphragm flange of the double-flange level gauge. Then, by supplying flushing fluid to the pressure tapping pipeline, the flushing fluid is sprayed out through the nozzles on the pressure tapping pipeline, thereby flushing and disturbing the pressure tapping pipe section of the equipment. This prevents substances such as sulfur paste from accumulating at the end of the pressure tapping pipe section and causing blockage. This can effectively improve the accuracy and effectiveness of the level gauge of the complex iron desulfurization device.

[0010] Furthermore, the plurality of nozzles are arranged in a straight line along the axis of the pressure-injecting pipeline.

[0011] The multiple nozzles in this solution are arranged in a straight line, which allows the flushing fluid to cover a larger area during the flushing process, ensuring that there are no dead angles when flushing the pressure pipe section, resulting in a better flushing effect.

[0012] Furthermore, one end of the pressure-sensing pipeline is connected to a connecting pipe, and a valve is installed on the connecting pipe.

[0013] The connecting pipe in this design facilitates the installation of valves and allows for easy connection to the flushing pipeline, thereby providing flushing fluid to the pressure line. The valves installed on the connecting pipes allow for easy opening of the corresponding valves according to actual flushing needs.

[0014] Furthermore, the connecting pipe is detachably connected to the pressure-feeding pipeline.

[0015] Because the connecting pipe needs to be connected to other pipelines, it is convenient to introduce flushing fluid into the pressure-sensing pipeline for flushing. When the entire flushing pipeline needs to be inspected and repaired, the connecting pipe and the pressure-sensing pipeline are detachably connected, which makes it easy to disconnect the pressure-sensing pipeline from the connecting pipe and to inspect and replace the corresponding parts.

[0016] Furthermore, one end of the pressure-sensing pipeline is connected to a ferrule fitting, and the connecting pipe and the ferrule fitting are threaded together.

[0017] In this solution, a compression fitting is connected to the pressure tapping line, and the connecting pipe is threaded to the compression fitting, thereby achieving a detachable connection between the connecting pipe and the pressure tapping line. This connection method is simple and convenient to operate.

[0018] A flushing system for a desulfurization equipment containing complexed iron includes a desulfurization equipment, a dual-flange level gauge, and a flushing device for the pressure tapping pipe section of the level gauge as described above.

[0019] The lower part of the desulfurization equipment is connected to a lower pressure inlet pipe section, one side of the upper part of the desulfurization equipment is connected to an upper pressure inlet pipe section, and the other side of the upper part of the desulfurization equipment is connected to a liquid inlet. The dual-flange level gauge includes a differential pressure transmitter, a capillary tube, and two diaphragm flanges. The two diaphragm flanges are respectively connected to the differential pressure transmitter through the capillary tube; the two diaphragm flanges are respectively connected to the upper pressure inlet pipe section and the lower pressure inlet pipe section.

[0020] The flushing flange is connected between each of the two diaphragm flanges and the upper and lower pressure pipe sections.

[0021] In this design, the flushing flange is installed between the diaphragm flange of the dual-flange level gauge and the upper and lower pressure taps. This allows flushing fluid to be introduced into the pressure taps on the flushing flange to spray and flush the upper and lower pressure taps, thus preventing blockages in the upper and lower pressure taps and ensuring the accuracy of the dual-flange level gauge is maintained.

[0022] Furthermore, it also includes a flushing pipe, one end of the pressure lines of the two flushing flanges is connected to a connecting pipe, a valve is installed on the connecting pipe on both flushing flanges, and the connecting pipe on both flushing flanges is connected to the flushing pipe.

[0023] In this design, the flushing pipe connects the upper and lower flushing flanges, allowing flushing fluid to be introduced into both flanges. This simplifies the fluid inlet path to the flushing flanges.

[0024] Furthermore, it also includes a lean solution pump and a lean solution tube, one end of which is connected to the flushing tube, and the other end of which is connected to the outlet of the lean solution pump.

[0025] In this scheme, the lean solution is pressurized by a lean solution pump and transported through the lean solution pipe to the flushing pipe, and then enters the pressure-inducing pipeline for spray flushing.

[0026] Furthermore, the desulfurization equipment is provided with multiple components. The lean liquid pipe includes a lean liquid distribution pipe and lean liquid branch pipes. The inlet of the lean liquid pump is connected to an inlet pipe, and the outlet of the lean liquid pump is connected to an outlet pipe. The lean liquid pipe is connected to the outlet pipe of the lean liquid pump. There are multiple lean liquid branch pipes. One end of each of the multiple lean liquid branch pipes is connected to the lean liquid distribution pipe, and the other end of each of the multiple lean liquid branch pipes is connected to the flushing pipes on the multiple desulfurization equipment.

[0027] This solution can simultaneously flush the pressure tapping pipe sections connected to the dual-flange level gauges on multiple desulfurization devices, preventing blockages in the pressure tapping pipe sections of the equipment.

[0028] The lean solution pipe includes a lean solution distribution pipe and lean solution branch pipes. After entering the lean solution distribution pipe, the flushing liquid enters the flushing pipes of each desulfurization equipment through multiple lean solution branch pipes, providing flushing liquid for the pressure tapping pipe sections of the flushing equipment.

[0029] Furthermore, ball valves are installed on multiple of the aforementioned lean liquid branch pipes.

[0030] In this solution, each lean solution branch pipe is equipped with a shut-off ball valve. This allows the shut-off ball valve of the corresponding desulfurization equipment to be opened according to actual flushing needs, while equipment that does not require flushing can be flushed by closing the corresponding shut-off ball valve. This solution can flexibly adjust the on / off state of the shut-off ball valves of each desulfurization equipment according to actual needs, and can flush the pressure pipe section of a single desulfurization equipment, or flush the pressure pipe sections of two or more desulfurization equipment simultaneously.

[0031] Furthermore, branch check valves are installed on each of the aforementioned lean liquid branch pipes.

[0032] The branch check valve in this design can prevent backflow of flushing fluid.

[0033] Furthermore, both the outlet and inlet pipes of the lean liquid pump are equipped with shut-off valves.

[0034] In this design, the shut-off valves installed on the outlet and inlet pipes of the lean liquid pump act as the main valves, facilitating the control of the liquid flow throughout the system.

[0035] Furthermore, a main check valve is also installed on the outlet pipe of the lean liquid pump, and the main check valve is located between the shut-off valve and the lean liquid pump.

[0036] The main check valve in this design can prevent liquid backflow in the pipeline.

[0037] Furthermore, a pressure gauge is installed on the outlet pipe of the lean liquid pump.

[0038] The pressure gauge in this design is used to monitor the outlet water pressure of the pipeline.

[0039] Furthermore, it also includes a demineralized water pump and a demineralized water pipe, one end of which is connected to the flushing pipe and the other end of which is connected to the outlet of the demineralized water pump.

[0040] This solution allows for the selection of different materials and states of matter as rinsing media based on existing processes. For example, lean solution or demineralized water can be selected as the rinsing media according to actual needs.

[0041] Furthermore, an upper pressure pipe section valve is connected between the upper pressure pipe section and the flushing flange, and a lower pressure pipe section valve is connected between the lower pressure pipe section and the flushing flange.

[0042] In this solution, the valves in the upper and lower pressure pipe sections are required by the process and can be shut off during maintenance and repair of the double flange liquid level, facilitating maintenance and repair operations. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0044] Figure 1 This is a perspective view of an embodiment of a flushing device for a level gauge pressure tapping pipe section in a desulfurization equipment according to the present invention;

[0045] Figure 2 This is a front view of an embodiment of a flushing device for a level gauge pressure tapping pipe section in a desulfurization equipment according to the present invention;

[0046] Figure 3 This is a partial schematic diagram of a liquid level gauge flushing system for a complexed iron desulfurization equipment according to the present invention;

[0047] Figure 4 This is an overall flow chart of the flushing system for the level gauge of a complexed iron desulfurization equipment according to the present invention;

[0048] Figure 5 This is a partial flow chart of the flushing system for the level gauge of a complexed iron desulfurization equipment according to the present invention.

[0049] The attached diagram shows the markings and corresponding component names:

[0050] 100. Flushing flange; 10. Upper sealing surface; 20. Lower sealing surface; 30. Pressure tapping line; 40. Nozzle; 50. Mounting hole; 60. Compression fitting; 70. Connecting pipe; 80. Compression ball valve; 90. Upper diaphragm flange; 91. Lower diaphragm flange; 92. Capillary tube; 93. Differential pressure transmitter;

[0051] 1. Lean liquor pump A; 2. Lean liquor pump B; 3. Demineralized water pump A; 4. Demineralized water pump B; 5. I-row absorption tower; 6. II-row absorption tower; 7. I-row flash separator; 8. II-row flash separator; 9. Sulfur foam tank;

[0052] 101. Shut-off valve; 102. Pressure gauge; 103. Main check valve; 104. Lean solution distribution pipe; 105. Lean solution branch pipe; 106. Inlet pipe; 107. Outlet pipe;

[0053] 201, Flushing Pipe 201;

[0054] 301. Demineralized water distribution pipe; 302. Demineralized water branch pipe;

[0055] 401. Lower pressure tapping section; 402. Upper pressure tapping section; 403. Lower pressure tapping section valve; 404. Upper pressure tapping section valve; 405. Liquid inlet;

[0056] 501. Shut-off ball valve; 502. Branch check valve. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0058] like Figures 1-2 As shown, as one embodiment of this application, a flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge includes a flushing flange 100 and a pressure tapping pipe 30. The top and bottom ends of the flushing flange 100 are respectively provided with an upper sealing surface 10 and a lower sealing surface 20. In this embodiment, the upper sealing surface 10 and the lower sealing surface 20 of the flushing flange 100 protrude from the top and bottom surfaces of the flushing flange 100, respectively. The upper sealing surface 10 and the lower sealing surface 20 are integrally formed with the flushing flange 100.

[0059] The flushing flange 100 has multiple circumferentially distributed mounting holes 50 at its end. In this embodiment, there are eight mounting holes 50, which are evenly distributed along the circumference of the flushing flange 100, and all mounting holes 50 are threaded through holes.

[0060] The pressure-sensing line 30 extends from the outside to the inside of the flushing flange 100. One end of the pressure-sensing line 30, located inside the flushing flange 100, abuts against the inside of the flushing flange 100. In this embodiment, the parts of the pressure-sensing line 30 that contact the inside and outside of the flushing flange 100 are welded and fixed, or the pressure-sensing line 30 is threaded to the flushing flange 100. The part of the pressure-sensing line 30 located inside the flushing flange 100 has multiple nozzles 40. The multiple nozzles 40 are arranged in a straight line along the axis of the pressure-sensing line 30. The nozzles 40 are circular holes, and the multiple nozzles 40 are arranged at a certain interval.

[0061] In this embodiment, one end of the pressure-sensing pipeline 30 is connected to a connecting pipe 70, and a valve is installed on the connecting pipe 70. In this embodiment, the valve is a compression ball valve 80. The connecting pipe 70 and the pressure-sensing pipeline 30 are detachably connected. Specifically, one end of the pressure-sensing pipeline 30 is connected to a compression fitting 60. The connecting pipe 70 and the compression fitting 60 are threaded together. The inner diameter of the pressure-sensing pipeline 30 is smaller than the inner diameter of the connecting pipe 70. The pressure-sensing pipeline 30 is threaded or welded to the compression fitting 60. The compression fitting 60 is hollow inside. When the connecting pipe 70 is connected to the compression fitting 60, it can be connected to the pressure-sensing pipeline 30.

[0062] As a specific embodiment of the present invention, given that the complexed iron solution is corrosive, the flushing flange 100 in this embodiment is a special flange designed and manufactured independently, and is selected and customized according to the required pressure rating and the flange diameter of the pressure tapping pipe section.

[0063] In this embodiment, a flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge is installed between the diaphragm flange of the double-flange level gauge and the flange of the pressure tapping pipe section of the desulfurization equipment. After the flushing medium enters the pressure tapping pipeline 30 from the connecting pipe 70, it is sprayed out from multiple nozzles to cover the entire cross-section of the pressure tapping pipe section of the equipment connected to the double-flange level gauge. The multiple nozzles allow for a wider spray range and no dead angles when flushing the pressure tapping pipe section, thereby improving the flushing effect and effectively preventing sulfur paste from accumulating at the end of the pressure tapping pipe section of the equipment and causing blockage.

[0064] like Figure 3 As shown, as one embodiment of this application, the difference between this embodiment and the above embodiment is that: this embodiment discloses a liquid level gauge flushing system for complex iron desulfurization equipment, including desulfurization equipment, a double flange liquid level gauge and a desulfurization equipment liquid level gauge pressure tapping pipe section flushing device in the above embodiment 1.

[0065] In this embodiment, the desulfurization equipment is described using an absorption tower as an example. The lower part of the desulfurization equipment is connected to a lower pressure pipe section 401, the upper part of the desulfurization equipment is connected to an upper pressure pipe section 402 on one side, and the upper part of the desulfurization equipment is connected to a liquid inlet 405 on the other side. The upper pressure pipe section 402 and the lower pressure pipe section 401 are located on the same side.

[0066] The dual-flange level gauge includes a differential pressure transmitter 93, a capillary tube 92, and two diaphragm flanges, namely an upper diaphragm flange 90 and a lower diaphragm flange 91. The two diaphragm flanges are connected to the differential pressure transmitter 93 through the capillary tube 92. The two diaphragm flanges are connected to the upper pressure tapping section 402 and the lower pressure tapping section 401, respectively. During installation, the nozzle 40 is set to face the pressure tapping sections (upper pressure tapping section 402 and lower pressure tapping section 401) of the desulfurization equipment.

[0067] In this embodiment, flushing flanges 100 are connected between the two diaphragm flanges and the upper pressure-feeding pipe section 402 and the lower pressure-feeding pipe section 401. In this embodiment, an upper pressure-feeding pipe section valve 404 is connected between the upper pressure-feeding pipe section 402 and the flushing flange 100. The flushing flange 100 is bolted to the flange of the upper pressure-feeding pipe section valve 404 through the mounting hole 50 on its end. A lower pressure-feeding pipe section valve 403 is connected between the lower pressure-feeding pipe section 401 and the flushing flange 100. The flushing flange 100 is bolted to the flange of the lower pressure-feeding pipe section valve 403 through the mounting hole 50 on its end.

[0068] The flushing system for the level gauge of the complexed iron desulfurization equipment in this embodiment also includes a flushing pipe 201, and the connecting pipes 70 on both flushing flanges 100 are connected to the flushing pipe 201. The flushing pipe 201 is connected to the pipeline that provides the flushing medium. For example, the flushing pipe 201 is connected to a lean liquid pump through the pipeline. The flushing medium (lean liquid) is pressurized by the lean liquid pump and injected through the flushing pipe 201 and sprayed out through the nozzle 40 on the pressure-sensing pipeline 30 of the flushing flange 100 to flush the pressure-sensing pipeline 30 of the equipment.

[0069] In this embodiment, a lean solution is selected as the flushing medium to minimize disturbance to the concentration of the complexed iron solution. Alternatively, existing demineralized water from the plant can be used for flushing.

[0070] like Figure 4 As shown, as one embodiment of this application, the difference between this embodiment and the above-mentioned embodiments is that this embodiment provides a liquid level gauge flushing system for complex iron desulfurization equipment, which also includes a lean liquid pump and a lean liquid pipe. One end of the lean liquid pipe is connected to the flushing pipe 201, and the other end of the lean liquid pipe is connected to the outlet of the lean liquid pump.

[0071] In this embodiment, multiple desulfurization devices are provided. The lean liquid pipe includes a lean liquid distribution pipe 104 and lean liquid branch pipes 105. The inlet of the lean liquid pump is connected to an inlet pipe 106, and the outlet of the lean liquid pump is connected to an outlet pipe 107. The lean liquid pipe is connected to the outlet pipe 107 of the lean liquid pump. Multiple lean liquid branch pipes 105 are provided. One end of each of the multiple lean liquid branch pipes 105 is connected to the lean liquid distribution pipe 104, and the other end of each of the multiple lean liquid branch pipes 105 is connected to the flushing pipes 201 on the multiple desulfurization devices respectively. Specifically: In this embodiment... The desulfurization equipment in this method includes an absorption tower, a flash separator, and a sulfur foam tank 9. The absorption tower includes a row of absorption towers 5 and a row of absorption towers 6. The flash separator includes a row of flash separators 7 and a row of flash separators 8. A double-flange level gauge is connected between the upper pressure pipe section 402 and the lower pressure pipe section 401 of each device. A flushing device for the pressure pipe section of the level gauge of the desulfurization equipment in Example 1 is installed between the diaphragm flange of the double-flange level gauge of each device and the flange of the ferrule ball valve 80 on the pressure pipe section.

[0072] In this embodiment, there are two lean liquid pumps, namely lean liquid pump A1 and lean liquid pump B2. One end of the outlet pipe 107 of the lean liquid pump is connected to a T-junction pipe. The lean liquid pump is connected to the inlet 405 of the absorption tower and the lean liquid distribution pipe 104 through the T-junction pipe and pipeline.

[0073] In this embodiment, a shut-off ball valve 501 and a branch check valve 502 are installed on each of the multiple lean liquid branch pipes 105. The branch check valve 502 is located between the shut-off ball valve 501 and the flushing pipe 201.

[0074] In this embodiment, both the outlet pipe 107 and the inlet pipe 106 of the lean liquid pump are equipped with shut-off valves 101. A total check valve 103 is also installed on the outlet pipe 107 of the lean liquid pump. The total check valve 103 is located between the shut-off valve 101 and the lean liquid pump. In this embodiment, a pressure gauge 102 is also installed on the outlet pipe 107 of the lean liquid pump.

[0075] As another embodiment of this application, the difference between this embodiment and the above embodiment is that this embodiment provides a flushing system for the liquid level gauge of the complexed iron desulfurization equipment, which also includes a demineralized water pump and a demineralized water pipe. One end of the demineralized water pipe is connected to the flushing pipe 201, and the other end of the demineralized water pipe is connected to the outlet of the demineralized water pump. In this embodiment, there are two demineralized water pumps, namely demineralized water pump A3 and demineralized water pump B4. The demineralized water pipe includes a demineralized water distribution pipe 301 and a demineralized water branch pipe 302. There are multiple demineralized water branch pipes 302. One end of each of the multiple demineralized water branch pipes 302 is connected to the demineralized water distribution pipe 301, and the other end of each of the multiple demineralized water branch pipes 302 is connected to the flushing pipes 201 of multiple desulfurization equipment respectively.

[0076] In this embodiment, the connection method of the demineralized water pump and the demineralized water pipe is the same as that of the lean liquid pump and the lean liquid pipe described above, as well as the structure of the installed valves, etc. In addition, a shut-off valve 101 is also installed on the inlet pipe 106 of the demineralized water pump, and a pressure gauge 102, a main check valve 103, and a shut-off valve 101 are installed on the outlet pipe 107 of the demineralized water pump; a branch check valve 502 and a shut-off ball valve 501 are installed on each of the demineralized water branch pipes 302 in the demineralized water pipe, and the installation positions are consistent with the valves on the lean liquid branch pipe 105.

[0077] In actual use, the flushing medium can be selected according to the process conditions of different stations. Generally, the pressure tapping pipe section is flushed using the self-owned solution system to minimize the disturbance to the concentration of complexed iron solution. Alternatively, the existing demineralized water at the station can be used to flush the level gauge.

[0078] The valves, pipelines, flanges, etc. of the liquid level gauge flushing device and its system in the complexed iron desulfurization equipment are all made of 316L stainless steel.

[0079] like Figure 4 and Figure 5As shown, the absorption tower is a high-pressure device. As indicated by the black arrow, the lean liquid is pressurized by lean liquid pump A1 and lean liquid pump B2 and enters the upper part of the absorption tower. Then, it passes through lean liquid distribution pipe 104 and lean liquid branch pipe 105, through shut-off ball valve 501 and branch check valve 502, and then through flushing pipe 201 to the pressure tapping line 30 of flushing flange 100. The liquid is sprayed out through the spray hole 40 on the pressure tapping line 30 to spray and disturb the accumulated sulfur paste in the upper pressure tapping section 402 and lower pressure tapping section 401 of the equipment, so as to prevent the sulfur paste from standing and accumulating at the end of the pressure tapping section and causing blockage, and to ensure that the upper pressure tapping section 402 and lower pressure tapping section 401 are always unobstructed.

[0080] Through the above measures, the liquid level measurement data is transmitted to the existing DCS system and SIS system in the central control room via differential pressure transmitter 93, ensuring the accuracy and authenticity of the liquid level in the absorption tower, realizing the safe, effective and real-time online liquid level measurement data, providing favorable conditions for the safe, stable, environmentally friendly and long-term operation of the equipment, and laying a solid foundation for the supply of clean energy.

[0081] like Figure 4 As shown, the flushing medium for the absorber level gauge can be either lean chelated iron solution or, in the same way, demineralized water pressurized by a demineralized water pump. To ensure the required flow rate of the desulfurization absorber and avoid significant fluctuations in the entire chelated iron solution system, flushing can be performed sequentially on only the pressure tapping section of the dual-flange level gauge of a single unit, according to the overall plan.

[0082] The flushing method for the remaining desulfurization equipment is the same as that for the absorption tower. It can be done by opening the valve on the corresponding flushing pipe 201, which will not be described in detail here.

[0083] This invention can be divided into a high-pressure flushing system for the liquid level gauge of the absorption tower in a complex iron desulfurization device and a low-pressure flushing system for the liquid level gauges of the flash tank and sulfur foam tank. One method involves flushing the liquid level gauges of a complex iron desulfurization device within the complex iron desulfurization absorption tower. The lean complex iron solution is pressurized by a pump and injected into the absorption tower from the top. A T-connection is made in the lean solution pipeline to introduce the lean complex iron solution into the flushing flanges 100 located at the top and bottom. The upper pressure-inlet pipe section 402 and the lower pressure-inlet pipe section 401 of the equipment are periodically flushed through nozzles 40. The liquid jet disturbs the accumulated sulfur paste, preventing it from accumulating and clogging at the end of the pressure-inlet pipe section. Using the same principle, the low-pressure flushing system of the flash tank and sulfur foam tank uses demineralized water as the flushing medium. The T-connected tee passes through the spray hole 40 to flush the upper pressure pipe section 402 located at the top of the equipment and the lower pressure pipe section 401 located at the bottom of the equipment at regular intervals. The spraying disturbs the accumulated sulfur paste, preventing the sulfur paste from standing still and accumulating at the end of the pressure pipe section and causing blockage.

[0084] This invention utilizes the existing process conditions of the complexed iron desulfurization unit to select different materials and states of matter as flushing media. It connects to existing process pipelines via a T-junction, making modification relatively simple and requiring fewer materials. The flushing medium, after its flow is controlled by the shut-off ball valve 501, enters the branch check valve 502, ensuring that the system does not experience backflow of the medium due to pressure loss. The flushing pipe 201 uses a special stainless steel pressure-sensing pipe for instrumentation, allowing for flexible selection of pipe diameter and convenient installation. The size and pressure rating of the flushing device with a customized double-sided sealing flange structure can be matched according to the site process conditions. Multiple nozzles 40 arranged in a straight line for radial flushing ensure that the liquid is flushed without any dead angles within the pressure-sensing pipe section.

[0085] This invention can control the flushing device and system of the liquid level gauge of the complex iron desulfurization equipment by means of timed switch or PLC program control. It can be started cyclically within an adjustable fixed cycle range. The sulfur paste deposited on the pressure tapping pipe section is blown away by the disturbance of the external medium, so as to avoid the liquid level gauge measurement distortion caused by the blockage of the liquid level gauge pressure tapping pipe 30 and ensure the inherent safety of the complex iron desulfurization device and equipment.

[0086] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge, characterized in that, It includes a flushing flange and a pressure-sensing pipeline, wherein the top and bottom ends of the flushing flange are respectively provided with an upper sealing surface and a lower sealing surface; The flushing flange has multiple circumferentially distributed mounting holes at its end; the pressure-sensing pipeline runs through the flushing flange from the outside to the inside, and the portion of the pressure-sensing pipeline located on the inside of the flushing flange has multiple spray holes.

2. The flushing device for the pressure tapping pipe section of the level gauge in a desulfurization equipment according to claim 1, characterized in that, The plurality of nozzles are arranged in a straight line along the axis of the pressure-injecting pipeline.

3. The flushing device for the pressure tapping pipe section of the level gauge in a desulfurization equipment according to claim 1, characterized in that, One end of the pressure-sensing pipeline is connected to a connecting pipe, and a valve is installed on the connecting pipe.

4. A flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge according to claim 3, characterized in that, The connecting pipe is detachably connected to the pressure-sensing pipeline.

5. A flushing device for the pressure tapping pipe section of a desulfurization equipment level gauge according to claim 4, characterized in that, One end of the pressure-sensing pipeline is connected to a ferrule fitting, and the connecting pipe and the ferrule fitting are threaded together.

6. A flushing system for a level gauge in a complexed iron desulfurization equipment, characterized in that, Includes desulfurization equipment, a dual-flange level gauge, and a flushing device for the pressure tapping pipe section of the desulfurization equipment level gauge as described in any one of claims 1-5; The lower part of the desulfurization equipment is connected to a lower pressure inlet pipe section, and the upper part of the desulfurization equipment is connected to an upper pressure inlet pipe section. The dual-flange level gauge includes a differential pressure transmitter, a capillary tube, and two diaphragm flanges. The two diaphragm flanges are respectively connected to the differential pressure transmitter through the capillary tube; the two diaphragm flanges are respectively connected to the upper pressure inlet pipe section and the lower pressure inlet pipe section. The flushing flange is connected between each of the two diaphragm flanges and the upper and lower pressure pipe sections.

7. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 6, characterized in that, It also includes a flushing pipe, one end of the pressure lines of the two flushing flanges is connected to a connecting pipe, a valve is installed on the connecting pipe of the two flushing flanges, and the connecting pipe of the two flushing flanges is connected to the flushing pipe.

8. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 7, characterized in that, It also includes a lean solution pump and a lean solution tube, one end of which is connected to the flushing tube and the other end of which is connected to the outlet of the lean solution pump.

9. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 8, characterized in that, The desulfurization equipment is provided in multiple ways. The lean liquid pipe includes a lean liquid distribution pipe and lean liquid branch pipes. The inlet of the lean liquid pump is connected to an inlet pipe, and the outlet of the lean liquid pump is connected to an outlet pipe. The lean liquid pipe is connected to the outlet pipe of the lean liquid pump. There are multiple lean liquid branch pipes. One end of each of the multiple lean liquid branch pipes is connected to the lean liquid distribution pipe, and the other end of each of the multiple lean liquid branch pipes is connected to the flushing pipes on the multiple desulfurization equipment.

10. A flushing system for a level gauge in a complexed iron desulfurization equipment according to claim 9, characterized in that, Each of the aforementioned lean liquid branch pipes is equipped with a ball valve.

11. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 9, characterized in that, Each of the aforementioned lean liquid branch pipes is equipped with a branch check valve.

12. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 9, characterized in that, Both the outlet and inlet pipes of the lean liquid pump are equipped with shut-off valves.

13. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 12, characterized in that, A main check valve is also installed on the outlet pipe of the lean liquid pump, and the main check valve is located between the shut-off valve and the lean liquid pump.

14. The flushing system for the level gauge of a complexed iron desulfurization equipment according to claim 9, characterized in that, A pressure gauge is installed on the outlet pipe of the lean liquid pump.

15. A flushing system for a liquid level gauge in a complexed iron desulfurization equipment according to any one of claims 7-14, characterized in that, It also includes a demineralized water pump and a demineralized water pipe, one end of which is connected to the flushing pipe and the other end of which is connected to the outlet of the demineralized water pump.

16. A flushing system for a liquid level gauge in a complexed iron desulfurization equipment according to any one of claims 6-14, characterized in that, An upper pressure pipe section valve is connected between the upper pressure pipe section and the flushing flange, and a lower pressure pipe section valve is connected between the lower pressure pipe section and the flushing flange.

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