Wellhead casing gas self-cleaning desulfurization and purification device without disassembly

Abstract

This invention discloses a self-cleaning desulfurization and purification device for wellhead casing gas without disassembly, comprising a first desulfurization tank, a second desulfurization tank, and a third desulfurization tank. The first desulfurization tank has an inlet pipe at its inlet end, and the first, second, and third desulfurization tanks are connected end-to-end by a connecting pipe. The third desulfurization tank has an outlet pipe at its outlet end. The first desulfurization tank contains multiple staggered baffles at its upper and lower ends. The second desulfurization tank contains multiple filter plates arranged sequentially along the airflow direction, each filter plate having a cleaning mechanism that can move up and down for mesh cleaning. The third desulfurization tank contains desulfurization adsorption particles. The baffles achieve liquid separation through collision with the casing gas. The addition of the filter plates further improves the separation efficiency of impurities in the casing gas through filtration. Finally, utilizing the adsorption properties of the desulfurization adsorption particles, the casing gas, after further purification, enters the desulfurization chamber, effectively achieving desulfurization of the casing gas.

Description

Technical Field

[0001] This invention relates to a self-cleaning desulfurization and purification device for wellhead casing gas that does not require disassembly, belonging to the technical field of natural gas desulfurization equipment. Background Technology

[0002] Currently, wellhead vacuum phase change heaters are widely used in oilfields to heat the produced fluids to ensure their flowability during pipeline transportation, enabling their safe delivery to the gathering and transportation station. Traditionally, wellhead medium-frequency electric heaters were used, resulting in high energy and electricity consumption. In recent years, oilfields have been actively promoting the application of vacuum phase change heaters fueled by well casing gas, achieving good energy-saving effects and significant economic benefits. However, the following challenging problems have also emerged:

[0003] 1. According to the national standard "General Requirements for Natural Gas" (GB / T 17920-2020), the standard for hydrogen sulfide content in natural gas is ≤20mg / m³. Some oilfield gas furnaces have substandard flue gas emissions, with sulfur content ≥20mg / m³, resulting in environmental non-compliance. Hydrogen sulfide is a toxic gas harmful to humans and animals. High concentrations of hydrogen sulfide can cause poisoning and even death; low concentrations can damage the eyes, respiratory system, and central nervous system. Furthermore, hydrogen sulfide is highly corrosive, causing severe corrosion and damage to gas furnaces and natural gas pipelines, leading to leaks, safety hazards, and environmental pollution. In addition, hydrogen sulfide is flammable and forms explosive mixtures with air, posing a fire and explosion hazard.

[0004] 2. The current heating process only has a simple gas separator installed between the oil well casing gas outlet and the vacuum phase change heater. The gas-liquid separation effect is not ideal, and the furnace often shuts down due to high water content in the casing gas.

[0005] 3. The on-site separator has a simple structure and small volume, only 10L, resulting in poor gas-liquid separation. Water vapor in the gas in the casing is prone to condense into water during the liquefaction process, which can lead to corrosion damage to the valve body of the gas boiler's first-stage pressure reducing valve and the inlet electromagnetic valve, increasing maintenance costs. Liquid accumulated in the pipeline is also prone to freezing and blocking the pipeline in low-temperature weather.

[0006] 4. The gas in the casing is relatively dirty due to high hydrogen sulfide content. Water and oil corrode the rubber gasket of the solenoid valve, causing it to malfunction. Solid impurities frequently cause the primary pressure reducing valve to fail.

[0007] In response to the above situation, it is necessary to develop desulfurization and purification devices to purify hydrogen sulfide and water-oil mixtures in natural gas, reducing the levels of hydrogen sulfide and water in the natural gas to safe levels, and ensuring clean and safe operation of the heating furnace. Based on the current state of natural gas quality, research on natural gas purification and control technologies is being conducted. The aim is to eliminate potential quality hazards in the natural gas combustion process at a lower natural gas processing cost, address safety and environmental risks, develop a wellhead natural gas purification technology, and promote its application in oilfields. Summary of the Invention

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the invention.

[0009] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0010] The purpose of this invention is to overcome the problems existing in the prior art and provide a self-cleaning desulfurization and purification device for well casing gas that does not require disassembly. This device can reduce hydrogen sulfide, water and impurities in the casing gas to a safe level and can achieve automatic cleaning, avoiding frequent disassembly and assembly, reducing harm to human health and corrosion of gas pipelines and related equipment, and eliminating safety hazards.

[0011] To solve the above technical problems, the present invention provides a self-cleaning desulfurization and purification device for wellhead casing gas without disassembly, comprising a first desulfurization tank, a second desulfurization tank, and a third desulfurization tank. The first desulfurization tank is provided with an air inlet pipe at its air inlet end. The first desulfurization tank, the second desulfurization tank, and the third desulfurization tank are connected end to end by a connecting pipe. The third desulfurization tank is provided with an exhaust pipe at its discharge end. The first desulfurization tank is provided with multiple baffles arranged alternately at its upper and lower ends. The second desulfurization tank is provided with multiple filter plates arranged sequentially along the airflow direction. The filter plates are also provided with a cleaning mechanism that can move up and down and is used for cleaning the mesh. The third desulfurization tank is provided with desulfurization adsorption particles.

[0012] Furthermore, the filter plate is in two sets, with the two sets of filter plates staggered. The filter plate is composed of multiple filter sub-plates. Each filter sub-plate has a first vertical frame fixedly connected on one side and a second vertical frame fixedly connected on the other side. The filter sub-plate has an upper horizontal frame fixedly connected at the top and a lower horizontal frame fixedly connected at the bottom.

[0013] Furthermore, the cleaning mechanism includes a cleaning pipe with multiple cleaning holes facing the filter plate opening. A cleaning box is provided on one side of the second desulfurization tank, and a delivery pump is provided inside the cleaning box. The cleaning pipe is movably arranged on one or both sides of the filter plate and extends along the width direction of the filter plate.

[0014] Furthermore, the cleaning mechanism also includes a cleaning tank and a delivery pump. The output end of the delivery pump is provided with a guide pipe that is connected to the cleaning pipe. The lower horizontal frame is provided with a recovery tank for recovering impurities after cleaning. The bottom of the second desulfurization tank is provided with a sewage discharge tank, and the bottom of the recovery tank is connected to the sewage discharge tank.

[0015] Furthermore, the bottom of the second desulfurization tank is provided with a reflux trough, the end of which is connected to the sewage discharge trough. The rotating shaft located below the lower horizontal frame is provided with a first trough connected to the recovery trough, and the first trough is connected to the reflux trough.

[0016] Furthermore, the upper horizontal frame has an upwardly extending rotating shaft fixed at its top center, and the lower horizontal frame has a downwardly extending rotating shaft fixed at its bottom center. The rotating shafts are rotatably connected to the inner wall of the second desulfurization tank.

[0017] Furthermore, the upper inner wall of the second desulfurization tank is also provided with a feed trough that rotates and is sealed to the rotating shaft, and a connecting trough is provided between adjacent feed troughs, and the guide pipe is connected to the adjacent feed trough.

[0018] Furthermore, the rotating shaft located on the upper horizontal frame is provided with two axially penetrating adjustment holes. The two adjustment holes are located on the same diameter line and are symmetrically located on both sides of the filter plate. The adjustment holes are provided with telescopic tubes that are fixedly connected. The lower end of the telescopic tube passes through the upper horizontal frame and communicates with the cleaning tube. The telescopic tube is provided with an elastic element for automatically restoring the telescopic tube to its initial position.

[0019] Furthermore, one side of the second vertical frame is provided with an openable baffle cloth for sealing the filter plates.

[0020] Furthermore, the second vertical frame is provided with two storage compartments, each containing a rotatably connected recovery shaft. The baffle cloth is wound around the recovery shaft, and the recovery shaft is provided with a ruler spring for driving the baffle cloth to be wound and recovered. The storage compartment has an inlet and outlet at the outer corner facing the filter plate. The inlet and outlet are provided with a pull rod fixedly connected to the extension end of the baffle cloth. The first vertical frame is provided with a slot that engages with the pull rod. Both the upper and lower ends of the slot are provided with through grooves. The through grooves are provided with a flexible linkage. One end of the linkage is fixedly connected to the inner wall of the corresponding second desulfurization tank, and the other end of the linkage is fixedly connected to the end of the corresponding pull rod. Both the upper and lower horizontal frames are provided with sliding grooves for the baffle cloth to move in and out.

[0021] Furthermore, the upper inner wall of the second desulfurization tank is provided with a plurality of drive grooves, and a plurality of first chains are provided in the drive grooves. Adjacent rotating shafts are connected by the first chain transmission. The desulfurization tank is provided with a drive mechanism for driving the rotating shafts to rotate.

[0022] Furthermore, the driving mechanism includes a synchronizing rod and a synchronizing groove. The second desulfurization tank is provided with two synchronizing grooves, which are respectively arranged on both sides of the driving groove. One synchronizing groove is connected to the driving groove above one set of filter plates, and the other synchronizing groove is connected to the driving groove above another set of filter plates. The synchronizing rod is movably arranged in the synchronizing groove. The synchronizing groove is provided with multiple rotatably connected synchronizing gears. A second chain is provided between the synchronizing gears and the corresponding rotating shafts. A rack is provided on one side of the synchronizing rod to mesh with the corresponding synchronizing gear. A hydraulic rod is fixedly connected in the synchronizing groove. The hydraulic rod is fixedly connected to the synchronizing rod.

[0023] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The design of the baffle can realize liquid separation through the collision between the baffle and the casing gas: the casing gas continuously changes its flow direction by constantly hitting the baffle, thus achieving the purpose of gas-liquid separation and reducing the pressure of subsequent filter plate filtration. With the addition of the filter plate, the casing gas passes through the stainless steel corrugated wire mesh, capturing the liquid for the second time while filtering out solid impurities in the casing gas. The separation efficiency of impurities in the casing gas can be further improved through filtration. Finally, the addition of desulfurization adsorption particles can utilize the adsorption properties of the desulfurization adsorption particles. After the casing gas is purified again, it enters the desulfurization chamber for deep desulfurization, which can effectively realize the desulfurization of the casing gas. After desulfurization, it passes through the top of the chamber and enters the gas heating furnace for combustion.

[0024] 2. The filter plates are divided into two groups, and the filter plates are made of multiple filter sub-plates. With the rotation of the filter sub-plates, the up and down movement of the cleaning pipe, and the unfolding and retraction of the baffle cloth, one group of filter plates can be in working condition during normal filtration, while the other group is rotated to be perpendicular to the filter plates. In this way, one group of filter plates can perform the filtration function normally, while the other group will not perform filtration due to the rotation of the filter sub-plates and the unfolding of the baffle cloth. Impurities are also prevented from entering the mesh due to the obstruction of the baffle cloth.

[0025] 3. When one set of filter plates becomes severely clogged after filtering for a certain period of time, the other set of vertically distributed filter plates can be rotated into working mode while the baffle cloth is retracted. Then, the severely clogged filter plates can be rotated to open in a parallel manner, thus achieving automatic filter plate replacement. This ensures that the original filtration efficiency remains unchanged and prevents clogging. After the clogged filter plates are rotated, the baffle cloth unfolds, and the up-and-down movement of the cleaning pipe automatically cleans the clogged mesh. The cleaned impurities can be directly discharged through the recovery tank and the sewage discharge tank. This design eliminates the need for disassembling or replacing the filter plates for cleaning, making it more convenient and faster without affecting the overall filtration efficiency.

[0026] 4. Improves the separation effect of gas-liquid and gas-solid processes, enables automatic sewage discharge, improves dehydration effect, reduces the labor intensity of on-site employees, reduces pollution to desulfurization catalysts, improves desulfurization efficiency, and reduces hazardous solid waste.

[0027] 5. While reducing energy consumption and improving efficiency, it also significantly reduces the impact on the environment. Experimental results show that after using this desulfurization and purification device, the hydrogen sulfide content in the emissions from the gas furnace terminal has been reduced to ≤10ppm.

[0028] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0029] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0030] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit the present invention. Wherein:

[0032] Figure 1This is a three-dimensional structural schematic diagram provided in Embodiment 1 of the present invention;

[0033] Figure 2 This is a top view schematic diagram of the filter plate structure provided in Embodiment 2 of the present invention;

[0034] Figure 3 This is a schematic diagram of the side cross-sectional connection structure of the second desulfurization pipe provided in Embodiment 2 of the present invention;

[0035] Figure 4 This is a schematic diagram of the three-dimensional structure of the filter plate composed of filter plates provided in Embodiment 2 of the present invention;

[0036] Figure 5 This is a schematic diagram of the connection structure between the baffle plate and the rotating shaft provided in Embodiment 2 of the present invention;

[0037] Figure 6 This is a top view cross-sectional diagram of the filter plate structure provided in Embodiment 2 of the present invention;

[0038] Figure 7 This is a schematic diagram of the cross-sectional connection structure of the synchronization groove and synchronization rod provided in Embodiment 2 of the present invention;

[0039] In the diagram: 1. First desulfurization tank; 11. Inlet pipe; 12. Baffle;

[0040] 2. Second desulfurization tank; 21. Filter plate; 210. Upper horizontal frame; 211. Filter partition plate; 212. First vertical frame; 213. Second vertical frame; 2131. Recovery shaft; 2132. Storage bin; 2133. Tie rod; 2134. Material retaining cloth; 214. Recovery trough; 215. Lower horizontal frame; 216. Slide groove; 217. Linkage component; 218. Slot; 219. Through groove;

[0041] 22. Cleaning box; 221. Flow guide pipe; 222. Connecting channel; 223. Feed chute; 224. Cleaning pipe; 225. Telescopic pipe; 226. Water baffle;

[0042] 23. Synchronizing rod; 231. Synchronizing groove; 232. Hydraulic rod; 233. Synchronizing gear; 234. Second chain;

[0043] 24. Rotating shaft; 241. First groove; 242. Adjustment hole;

[0044] 25. Drive slot; 26. First chain; 27. Sewage drain; 271. Return channel;

[0045] 3. Third desulfurization tank; 31. Exhaust pipe. Detailed Implementation

[0046] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0047] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific illustrations. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Example

[0049] like Figure 1 As shown, the wellhead casing gas self-cleaning desulfurization and purification device of the present invention includes a first desulfurization tank 1, a second desulfurization tank 2, and a third desulfurization tank 3. The first desulfurization tank 1 is provided with an air inlet pipe 11 at its air inlet end. The first desulfurization tank 1, the second desulfurization tank 2, and the third desulfurization tank 3 are connected end to end by a connecting pipe. The third desulfurization tank 3 is provided with an exhaust pipe 31 at its discharge end. The upper and lower inner peripheral walls of the first desulfurization tank 1 are provided with a plurality of baffles 12 arranged alternately. The baffles 12 connected to the upper inner wall extend below the horizontal diameter line, and the baffles 12 connected to the lower inner wall extend above the horizontal diameter line.

[0050] The second desulfurization tank 2 is equipped with multiple filter plates 21 arranged in sequence along the airflow direction. The filter plates 21 are also equipped with a cleaning mechanism that can move up and down and is used for cleaning the mesh. The third desulfurization tank 3 is filled with desulfurization adsorption particles.

[0051] The staggered design of the baffles 12 enables efficient gas-liquid separation through collisions between the baffles 12 and the casing gas. Natural gas continuously changes its flow direction by impacting the baffles 12, achieving gas-liquid separation and reducing the load on the subsequent filter plate 21. With the addition of the filter plate 21, the casing gas passes through the stainless steel corrugated wire mesh, capturing liquid for the second time while filtering out solid impurities in the casing gas. This filtration process further improves the separation efficiency of impurities in the casing gas. Finally, the gas enters the third desulfurization tank 3. Utilizing the adsorption properties of the desulfurization adsorption particles, the casing gas undergoes secondary purification before entering the desulfurization chamber, effectively achieving desulfurization of the casing gas. After desulfurization, the gas is discharged from the exhaust pipe 31 at the top of the chamber and enters the gas-fired heating furnace for combustion. Example

[0052] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in this embodiment, the filter plate 21 is provided in two sets, and the two sets of filter plates 21 are staggered. The filter plate 21 includes filter sub-plates 211, and there are multiple filter sub-plates 211. One side of the filter sub-plate 211 is provided with a first vertical frame 212 fixedly connected, and the other side of the filter sub-plate 211 is provided with a second vertical frame 213 fixedly connected. The upper end of the filter sub-plate 211 is provided with an upper horizontal frame 210 fixedly connected, and the bottom of the filter sub-plate 211 is provided with a lower horizontal frame 215 fixedly connected.

[0053] The cleaning mechanism includes a cleaning pipe 224, a cleaning box 22, and a delivery pump. The cleaning pipe 224 has multiple cleaning holes that open into the filter plate 211.

[0054] A cleaning box 22 is provided on one side of the second desulfurization tank 2. A conveying pump is installed inside the cleaning box 22. A cleaning pipe 224 is installed on both sides of the filter plate 211, which can move up and down, for bidirectional cleaning of the filter holes of the filter plate 211. The output end of the conveying pump is provided with a guide pipe 221 that is connected to the cleaning pipe 224. A baffle cloth 2134 that can be opened and closed and is used to seal the filter plate 211 is provided on the side of the second vertical frame 213 located outside the end of the cleaning pipe 224. A recovery tank 214 for recovering impurities after cleaning is provided on the lower horizontal frame 215. A sewage discharge tank 27 is provided at the bottom of the second desulfurization tank 2. The bottom of each recovery tank 214 is connected to the sewage discharge tank 27.

[0055] The filter plate 21 is divided into two groups that work alternately. The filter plate 21 is composed of multiple filter sub-plates 211 assembled together. Through the rotation of each filter sub-plate 211, the up-and-down movement of the cleaning tube 224, and the unfolding and retraction of the baffle cloth 2134, one group can form a complete flat filter plate 21 during normal filtration, and this filter plate 21 enters the filtration working state. When the filter sub-plates 211 of the other group are rotated perpendicular to the filter plate 21, one group of filter plates 21 can perform its filtration function normally, while the other group, due to the rotation of the filter sub-plates 211 and the unfolding of the baffle cloth 2134, will not perform filtration, and impurities will be blocked by the baffle cloth 2134, preventing them from entering the mesh of the filter sub-plates 211.

[0056] When one set of filter plates 21 becomes severely clogged after filtering for a certain period of time, the other set of vertical filter plates 211 can be rotated into a working state while the baffle cloth 2134 is retracted. Then, the severely clogged filter plates 21 are rotated 90 degrees to become parallel to each other. This achieves automatic replacement of the filter plates 21 from the working state to the clean standby state, ensuring that the original filtration efficiency remains unchanged and preventing clogging. After the clogged filter plates 211 are rotated, the baffle cloth 2134 unfolds, and the cleaning pipe 224 moves up and down to automatically clean the clogged mesh. At the same time, the cleaned impurities can be directly discharged through the recovery tank 214 and the sewage discharge tank 27. This design eliminates the need to disassemble and clean or replace the filter plates 21, achieving automatic cleaning of the filter plates 21 directly, which is more convenient and faster, and does not affect the overall filtration efficiency.

[0057] like Figure 3 and Figure 5 As shown, in this embodiment, the top center of the upper horizontal frame 210 and the bottom center of the lower horizontal frame 215 are both provided with fixedly connected rotating shafts 24, so that the upper horizontal frame 210, the lower horizontal frame 215, the filter plate 211, the first vertical frame 212 and the second vertical frame 213 can rotate as a whole. The rotating shafts 24 are rotatably connected to the inner wall of the second desulfurization tank 2, and the upper inner wall of the second desulfurization tank 2 is also provided with a feed trough 223 that is rotatably and sealedly connected to the rotating shafts 24. A connecting groove 222 is provided between adjacent feed troughs 223, and the guide pipe 221 is connected to the adjacent feed trough 223.

[0058] The rotating shaft 24 located on the upper horizontal frame 210 has two axially penetrating adjustment holes 242. The two adjustment holes 242 are located on the same diameter line and are symmetrically arranged. The diameter line of the two adjustment holes 242 is perpendicular to the filter plate 211 and is located on both sides of the filter plate 211. A telescopic tube 225 is fixedly connected inside the adjustment hole 242. The lower end of the telescopic tube 225 passes through the upper horizontal frame 210 and communicates with the cleaning tube 224. The telescopic tube 225 has an elastic element for automatically returning the telescopic tube 225 to its initial position. The bottom of the feed trough 223 has fixedly connected and symmetrically distributed baffles 226. The two baffles 226 are symmetrically crescent-shaped, and a flow channel is formed between the two baffles 226. The design of the baffle plate 226 ensures that the feed trough 223 connects to the telescopic pipe 225 in the corresponding adjustment hole 242 only when the filter plates 211 are rotated to a parallel position. This guarantees that the cleaning pipe 224 can only perform spray cleaning when the filter plates 211 are rotated to a parallel position. When the filter plates 211 are rotated to a parallel position and assembled into a complete filter plate 21, the two adjustment holes 242 respectively enter below the corresponding baffle plate 226, cutting off the water supply to the telescopic pipe 225.

[0059] The design of the telescopic tube 225 enables automatic extension of the telescopic tube 225 using hydraulic means, and automatic downward spraying cleaning of the cleaning tube 224. The elastic element can be a spring or elastic band, which enables automatic retraction of the cleaning tube 224 after cleaning, and enables the cleaning tube 224 to clean the mesh by moving up and down.

[0060] like Figure 3 As shown, in this embodiment, the bottom of the second desulfurization tank 2 is provided with a return trough 271, the end of the return trough 271 is connected to the sewage discharge trough 27, and the rotating shaft 24 located below the lower horizontal frame 215 is provided with a first trough 241 connected to the recovery trough 214, the lower end of the first trough 241 is connected to the return trough 271.

[0061] like Figure 6 As shown, in this embodiment, the second vertical frame 213 is provided with two storage compartments 2132, and each of the two storage compartments 2132 is provided with a rotatably connected recovery shaft 2131. A baffle cloth 2134 is wound around the recovery shaft 2131, and a ruler spring is provided on the recovery shaft 2131 for driving the baffle cloth 2134 to be wound and recovered. The storage compartments 2132 have inlets and outlets at their corners facing the outer side of the filter plate 211, and pull rods 2133 are provided inside the inlets and outlets. The extended end of the baffle cloth 2134 is fixedly connected to the pull rod 2133. The vertical frame 212 is provided with a slot 218 that engages with the pull rod 2133. Both the upper and lower ends of the slot 218 are provided with through grooves 219. The through grooves 219 are provided with flexible linkages 217, which can be steel wire ropes. One end of the linkage 217 is fixedly connected to the inner wall of the corresponding second desulfurization tank 2, and the other end of the linkage 217 is fixedly connected to the end of the corresponding pull rod 2133. The upper horizontal frame 210 and the lower horizontal frame 215 are both provided with sliding grooves 216 for the material blocking cloth 2134 to move in and out.

[0062] The design of the ruler spring enables the automatic retraction of the baffle cloth 2134, while the design of the linkage 217 and the pull rod 2133 enables the filter plate 211 to automatically unfold the baffle cloth 2134 after rotation through the transmission of the linkage 217.

[0063] like Figure 7 As shown, in this embodiment, the inner wall of the second desulfurization tank 2 is provided with a plurality of drive grooves 25, and a plurality of first chains 26 are provided in the drive grooves 25. Adjacent rotating shafts 24 are connected by transmission through the first chains 26. The desulfurization tank is provided with a drive mechanism for driving the rotating shafts 24 to rotate.

[0064] In this embodiment, the drive mechanism includes a synchronizing rod 23 and a synchronizing groove 231. The second desulfurization tank 2 is provided with two synchronizing grooves 231, which are respectively located on the outer side of the end of the drive groove 25. One synchronizing groove 231 is connected to the drive groove 25 above one set of filter plates 21, and the other synchronizing groove 231 is connected to the drive groove 25 above another set of filter plates 21. The synchronizing rod 23 is movably disposed in the synchronizing groove 231. The synchronizing groove 231 is provided with multiple rotatably connected synchronizing gears 233. The synchronizing gears 233 and the corresponding rotating shafts 24 are connected by a second chain 234. One side of the synchronizing rod 23 is provided with a rack that meshes with the corresponding synchronizing gear 233. The synchronizing groove 231 is provided with a fixedly connected hydraulic rod 232, which is connected to the end of the synchronizing rod 23.

[0065] The reciprocating translation of the synchronizing rod 23 is achieved by extending and retracting the hydraulic rod 232, while the design of the rack, synchronizing gear 233, first chain 26 and second chain 234 realizes the rotation control of the filter plates 211 in different groups.

[0066] When using this purification device:

[0067] First, the casing gas is introduced into the first desulfurization tank 1 through the air inlet pipe 11, and the casing gas passes through the baffle 12 in sequence. The casing gas continuously changes its flow direction by constantly hitting the baffle 12, thus achieving gas-liquid separation.

[0068] After separation, the casing gas enters the second desulfurization tank 2 through the connecting pipe. Inside the second desulfurization tank 2, there are two sets of filter plates 21. The filter plates 211 in the first set of filter plates 21 are rotated to be parallel to each other, while the filter plates 211 in the second set of filter plates are flush with each other. The casing gas passes through the first set of filter plates 211 and is filtered by the mesh on the second set of filter plates 211. In this way, the second set of filter plates 211 filters the casing gas in sequence.

[0069] When the filter plates 211 of the second group filter for a certain period of time and the mesh is about to become clogged, the hydraulic rod 232 is activated, which drives the synchronous rod 23 to move. Through the transmission of the rack and pinion and the synchronous gear 233, the rotating shafts 24 of the first group are rotated synchronously, so that the filter plates 211 in the first group change from being parallel to being flush with each other, and the filter plates 211 form a whole filter plate 21. Then, the rotating shafts 24 of the second group are controlled to rotate synchronously, so that the filter plates 211 in the second group change from being flush with each other to being parallel with each other.

[0070] While the rotating shafts 24 of the first group rotate, the linkage 217 and the baffle cloth 2134 are automatically retracted under the action of the spring, so that the baffle cloth 2134 on the outside of the filter plate 211 is automatically retracted into the storage chamber 2132, opening the filter plates 211 and enabling them to start filtering. Meanwhile, while the rotating shafts 24 of the second group rotate, the linkage 217 drives the pull rod 2133 to move automatically outward, moving the pull rod 2133 from the second vertical frame 213 to the first vertical frame 212, automatically unfolding the baffle cloth 2134 and automatically sealing any clogged filter plates 211.

[0071] After the filter plates 211 of the second group are rotated and formed, the delivery pump is started to automatically deliver the cleaning liquid in the cleaning tank 22 to the corresponding cleaning pipe 224, which is then sprayed out through the cleaning holes. As the water pressure increases, the cleaning pipe 224 can be driven to move downward automatically, realizing automatic downward spraying cleaning of the cleaning pipe 224. After cleaning is completed, the delivery pump is turned off, and the telescopic pipe 225 is automatically retracted under the action of the elastic element. Due to the presence of the baffle cloth 2134, natural gas will not enter the baffle cloth 2134 during cleaning, and the cleaning liquid will not enter the second desulfurization tank 2.

[0072] After the filter plate 211 is cleaned, the wastewater from the cleaning process enters the first tank 241 through the recovery tank 214, and is then discharged through the return tank 271 and the sewage discharge tank 27.

[0073] When the filter plates 211 of the second group are about to become clogged, the first and second groups can be directly replaced in the manner described above, so that the first group can filter again, while the filter plates 211 of the second group can be cleaned.

[0074] After removing moisture and impurities, the casing gas enters the desulfurization chamber for deep desulfurization. The desulfurization chamber uses ferric hydroxide, a solid desulfurizing agent, with a filling capacity of 30L / chamber. The replacement cycle can be more than six months, and the desulfurization effect can be far superior to the national standard.

[0075] Taking the Zhou 38-3 well site as an example, the wellhead gas furnace uses casing gas with a high hydrogen sulfide content transported by Zhou 43. The hydrogen sulfide content is about 2500ppm, which is also the highest hydrogen sulfide content in the wellhead gas furnace of the Zhou Song oil production station. The hydrogen sulfide content in the flue gas emission of the wellhead gas furnace at the well site seriously exceeds the standard. According to regulations, the furnace should be shut down and replaced with a standby 10KV•A medium frequency electric heater. Therefore, this desulfurization and purification device was selected to be installed at the Zhou 38-3 well site for testing.

[0076] During the experiment, the hydrogen sulfide content at the front end of the desulfurization unit was measured to be 2500 ppm, the hydrogen sulfide content at the end of the desulfurization unit was 350 ppm, and the sulfur content at the flue gas outlet of the gas furnace was ≤10 ppm. Operators only need to routinely check and record data daily; there are no other management tasks.

[0077] Because the purpose of this gas-fired boiler is to raise the temperature at the end of the long-distance transmission line, the medium-frequency electric heating is on 24 hours a day. It operates in heating mode for 8 months and in unblocking mode for the remaining 4 months. Based on an average electricity price of 0.7 yuan / kWh, the annual power cost is:

[0078] (10×50%×24×245+10×80%×24×120)×0.7=37,000 yuan

[0079] After natural gas undergoes dehydration, impurity removal, and desulfurization purification treatment in this desulfurization and purification unit, the corrosion of equipment and process pipelines is greatly reduced. For example, in previous years, severe corrosion was found inside the primary pressure reducing valve body and the rubber gasket of the inlet solenoid valve during gas boiler maintenance. This was caused by high-sulfur natural gas, requiring replacement 2-3 times a year. After desulfurization treatment, these two pieces of equipment can save approximately 20,000 yuan in maintenance costs annually.

[0080] In addition to reducing equipment damage, the economic benefits are even more obvious; furthermore, reducing hydrogen sulfide emissions lowers the harm to employees' health, reduces safety and environmental risks, and has significant social and environmental benefits.

[0081] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A self-cleaning desulfurization and purification device for wellhead casing gas without disassembly, characterized in that, The system includes a first desulfurization tank, a second desulfurization tank, and a third desulfurization tank. The first desulfurization tank is equipped with an air inlet pipe at its inlet end. The first, second, and third desulfurization tanks are connected by a connecting pipe at their ends. The third desulfurization tank is equipped with an exhaust pipe at its outlet end. The first desulfurization tank has multiple baffles arranged in a staggered manner at its upper and lower ends. The second desulfurization tank has multiple filter plates arranged sequentially along the airflow direction. The filter plates are also equipped with a cleaning mechanism that moves up and down for cleaning the mesh. The third desulfurization tank contains desulfurization adsorption particles. The filter plate consists of two sets, which are staggered. The filter plate is composed of multiple filter sub-plates. Each filter sub-plate has a first vertical frame fixedly connected on one side and a second vertical frame fixedly connected on the other side. The filter sub-plate has an upper horizontal frame fixedly connected at the top and a lower horizontal frame fixedly connected at the bottom. The upper horizontal frame has an upwardly extending rotating shaft fixed at its top center, and the lower horizontal frame has a downwardly extending rotating shaft fixed at its bottom center. The upwardly extending rotating shaft and the downwardly extending rotating shaft are respectively rotatably connected to the inner wall of the second desulfurization tank. The cleaning mechanism includes a cleaning pipe with multiple cleaning holes facing the filter plate opening. A cleaning box is provided on one side of the second desulfurization tank, and a delivery pump is provided inside the cleaning box. The cleaning pipe is movable up and down and is arranged on one or both sides of the filter plate, and extends along the width direction of the filter plate. The second vertical frame has an opening and closing baffle cloth on one side for sealing the filter plates. The second vertical frame contains two storage compartments, each with a rotatably connected recovery shaft. The baffle cloth is wound around the recovery shaft, which has a spring for winding and recovering the baffle cloth. The storage compartments have inlets and outlets at their outer corners facing the filter plates. Each inlet and outlet has a pull rod fixedly connected to the extension end of the baffle cloth. The first vertical frame has a slot that engages with the pull rod. Both ends of the slot have through-hole grooves. Each through-hole groove contains a bendable linkage. One end of the linkage is fixedly connected to the inner wall of the corresponding second desulfurization tank, and the other end is fixedly connected to the end of the corresponding pull rod. Both the upper and lower horizontal frames have sliding grooves for moving the baffle cloth in and out.

2. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 1, characterized in that: The cleaning mechanism also includes a cleaning tank and a delivery pump. The output end of the delivery pump is provided with a guide pipe that is connected to the cleaning pipe. The lower horizontal frame is provided with a recovery tank for recovering impurities after cleaning. The bottom of the second desulfurization tank is provided with a sewage discharge tank. The bottom of the recovery tank is connected to the sewage discharge tank.

3. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 2, characterized in that: The bottom of the second desulfurization tank is provided with a reflux trough, the end of which is connected to the sewage discharge trough. The rotating shaft located below the lower horizontal frame is provided with a first trough connected to the recovery trough, and the first trough is connected to the reflux trough.

4. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 2, characterized in that: The upper inner wall of the second desulfurization tank is also provided with a feed trough that rotates and is sealed to the rotating shaft, and a connecting trough is provided between adjacent feed troughs, and the guide pipe is connected to the adjacent feed trough.

5. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 4, characterized in that: The rotating shaft located on the upper horizontal frame has two axially penetrating adjustment holes. The two adjustment holes are located on the same diameter line and are symmetrically located on both sides of the filter plate. The adjustment holes are equipped with telescopic tubes that are fixedly connected. The lower end of the telescopic tube passes through the upper horizontal frame and communicates with the cleaning tube. The telescopic tube is equipped with an elastic element for automatically restoring the telescopic tube to its initial position.

6. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 1, characterized in that: The upper inner wall of the second desulfurization tank is provided with multiple drive grooves, and multiple first chains are provided in the drive grooves. Adjacent rotating shafts are connected by the first chain transmission. The desulfurization tank is provided with a drive mechanism for driving the rotating shafts to rotate.

7. The wellhead casing gas self-cleaning desulfurization and purification device without disassembly as described in claim 6, characterized in that: The driving mechanism includes a synchronizing rod and a synchronizing groove. The second desulfurization tank is provided with two synchronizing grooves, which are respectively arranged on both sides of the driving groove. One synchronizing groove is connected to the driving groove above one set of filter plates, and the other synchronizing groove is connected to the driving groove above another set of filter plates. The synchronizing rod is arranged in the synchronizing groove and can move back and forth. The synchronizing groove is provided with multiple rotatably connected synchronizing gears. A second chain is provided between the synchronizing gears and the corresponding rotating shafts. A rack is provided on one side of the synchronizing rod to mesh with the corresponding synchronizing gear. A hydraulic rod is fixedly connected in the synchronizing groove and is fixedly connected to the synchronizing rod.

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