Disassembly-free self-cleaning desulfurization purification device for wellhead casing gas

Abstract

The invention discloses a wellhead casing gas disassembly-free self-cleaning desulfurization purification device which comprises a first desulfurization tank, a second desulfurization tank and a third desulfurization tank, a gas inlet pipe is arranged at the gas inlet end of the first desulfurization tank, communicating pipes are arranged between the heads and tails of the first desulfurization tank, the second desulfurization tank and the third desulfurization tank, and an exhaust pipe is arranged at the discharge end of the third desulfurization tank. A plurality of baffles which are distributed in a staggered mode are arranged at the upper end and the lower end in the first sulfur removal tank, a plurality of filter plates are sequentially arranged in the second sulfur removal tank in the airflow direction, cleaning mechanisms which can move up and down and are used for cleaning meshes are further arranged on the filter plates, and sulfur removal adsorption particles are arranged in the third sulfur removal tank. The baffle can achieve liquid separation through collision between the baffle and the casing gas, the filter plate is additionally arranged, the separation efficiency of impurities in the casing gas can be further improved in a filtering mode, finally, the casing gas enters the desulfurization bin after being purified again by means of the adsorbability of desulfurization adsorption particles, and desulfurization of the casing gas can be effectively achieved.

Description

Technical Field

[0001] The invention relates to a wellhead casing gas disassembly-free self-cleaning desulfurization purification device, belonging to the technical field of natural gas desulfurization equipment. Background Art

[0002] At present, wellhead vacuum phase change heating furnaces are widely used in oilfields to heat the oil well output fluids to ensure the fluidity of the oil well output fluids during pipeline transportation, so that they can be safely transported to the gathering and transportation station. Traditionally, wellhead medium frequency electric heaters are used for heating, resulting in high energy consumption and large power consumption. In recent years, oil production plants have been actively promoting the application of vacuum phase change heating furnaces using oil well casing gas as fuel, which has achieved good power saving effects and significant economic benefits. However, it also exposed the following more difficult problems: 1. According to the provisions of the national standard "General Requirements for Natural Gas" (GB / T 17920-2020), the content standard of hydrogen sulfide (HS) in natural gas is: ≤20mg / m³. The flue gas emissions of some gas furnaces in oil fields are unqualified, with a sulfur content of ≥20mg / m³, resulting in non-compliance with environmental protection standards. Hydrogen sulfide is a toxic gas that is harmful to humans and animals. High concentrations of hydrogen sulfide can cause poisoning and even endanger life; low concentrations of hydrogen sulfide can damage the eyes, respiratory system and central nervous system; and hydrogen sulfide is highly corrosive, which can cause serious corrosion and damage to gas furnaces and natural gas pipelines, causing leakage, bringing safety hazards and causing environmental pollution. In addition, hydrogen sulfide is easy to burn and forms an explosive mixture with air, posing a risk of fire and explosion.

[0003] 2. The current heating process only installs a simple gas separation bag between the oil well casing gas outlet and the vacuum phase change heating furnace. The gas-liquid separation effect is not ideal, and the furnace is often shut down due to high water content in the casing gas.

[0004] 3. The on-site separator has a simple structure and a small volume of only 10L, and the gas-liquid separation effect is poor; the water vapor in the casing gas easily condenses into water during the liquefaction process, causing corrosion damage to the valve body of the first-stage pressure reducing valve of the gas furnace and the air inlet electromagnetic, increasing maintenance costs, and the liquid accumulated in the pipeline is easy to freeze and block the pipeline in low temperature weather.

[0005] 4. The casing gas is relatively dirty. Because of the high content of hydrogen sulfide, water and oil corrode the rubber pad of the solenoid valve, causing the solenoid valve to malfunction. Solid impurities often cause the first-stage pressure reducing valve to malfunction.

[0006] In view of the above situation, it is necessary to develop a desulfurization purification device to purify hydrogen sulfide and water-oil mixture in natural gas, so as to reduce hydrogen sulfide and water in natural gas to a safe level and ensure the clean and safe production of the heating furnace. In view of the current status of natural gas quality, research on natural gas purification control technology is carried out, aiming to eliminate quality risks in the natural gas combustion link at a lower natural gas processing cost, solve safety and environmental risks, form a wellhead natural gas purification technology, and promote its application in oil production plants. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification of this application and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0009] The purpose of the present invention is to overcome the problems existing in the prior art and provide a wellhead casing gas self-cleaning desulfurization purification device that does not require disassembly, which can reduce the hydrogen sulfide, water and impurities in the casing gas to a safe level, and can achieve automatic cleaning, avoid frequent disassembly and assembly, reduce harm to human health and corrosion to gas pipelines and related equipment, and eliminate safety hazards.

[0010] In order to solve the above technical problems, the present invention provides a wellhead casing gas self-cleaning desulfurization and purification device that does not require disassembly, including a first desulfurization tank, a second desulfurization tank and a third desulfurization tank. The air inlet end of the first desulfurization tank is provided with an air inlet pipe, and connecting pipes are provided between the first desulfurization tank, the second desulfurization tank and the third desulfurization tank. The discharge end of the third desulfurization tank is provided with an exhaust pipe, and the upper and lower ends of the first desulfurization tank are provided with a plurality of baffles distributed in an interlaced manner. The second desulfurization tank is provided with a plurality of filter plates in sequence along the airflow direction, and the filter plate is 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.

[0011] Furthermore, the filter plates are divided into two groups, and the two groups of filter plates are staggered. The filter plates are composed of multiple filter sub-plates. A first vertical frame is fixedly connected on one side of each filter sub-plate, and a second vertical frame is fixedly connected on the other side of each filter sub-plate. An upper horizontal frame is fixedly connected on the upper end of the filter sub-plate, and a lower horizontal frame is fixedly connected on the bottom of the filter sub-plate.

[0012] Furthermore, the cleaning mechanism includes a cleaning pipe, which is provided with a plurality of cleaning holes facing the filter plate opening. A cleaning box is provided on one side of the second desulfurization tank, and a conveying pump is provided in the cleaning box. The cleaning pipe can be arranged on one side or both sides of the filter plate so as to move up and down, and extends along the width direction of the filter plate.

[0013] Furthermore, the cleaning mechanism also includes a cleaning box and a delivery pump, the output end of the delivery pump is provided with a guide pipe 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 tank, and the bottom of the recovery tank is connected to the sewage tank.

[0014] Furthermore, a reflux groove is provided at the bottom of the second desulfurization tank, and the end of the reflux groove is connected to the sewage groove. A first groove connected to the recovery groove is provided in the rotating shaft below the lower horizontal frame, and the first groove is connected to the reflux groove.

[0015] Furthermore, a rotating shaft extending upward is fixed at the top center of the upper transverse frame, and a rotating shaft extending downward is fixed at the bottom center of the lower transverse frame, and the rotating shafts are rotatably connected to the inner wall of the second desulfurization tank respectively.

[0016] Furthermore, the upper inner wall of the second desulfurization tank is also provided with a feed trough which rotates with the rotating shaft and is sealed, and adjacent feed troughs are provided with interconnected connecting troughs, and the guide pipe is connected with adjacent feed troughs.

[0017] Furthermore, two axially penetrating adjustment holes are provided in the rotating shaft on the upper horizontal frame. The two adjustment holes are located on the same diameter line and symmetrically located on both sides of the filter plate. A fixedly connected telescopic tube is provided in the adjustment hole. The lower end of the telescopic tube passes through the upper horizontal frame and is connected to the cleaning tube. An elastic member is provided in the telescopic tube for driving the telescopic tube to automatically restore its initial position.

[0018] Furthermore, a material blocking cloth which can be opened and closed and is used for sealing the filter sub-plate is provided on one side of the second vertical frame.

[0019] Furthermore, two storage bins are provided in the second vertical frame, and rotatably connected recovery shafts are respectively provided in the storage bins, and the material-blocking cloths are respectively wound on the recovery shafts, and the recovery shafts are provided with ruler springs for driving the material-blocking cloths to be wound and recovered; an inlet and an outlet are provided at the outer corners of the storage bins facing the filter plate, and a pull rod fixedly connected to the extended end of the material-blocking cloth is provided in the inlet and the outlet, and a slot engaged with the pull rod is provided on the first vertical frame, and a through-type through slots are provided at the upper and lower ends of the slot, and a bendable linkage part is provided in the through slot, and one end of the linkage part is fixedly connected to the corresponding inner wall of the second desulfurization tank, and the other end of the linkage part is fixedly connected to the corresponding end of the pull rod, and a slide groove for moving the material-blocking cloth in and out is provided on the upper and lower horizontal frames.

[0020] Furthermore, the upper inner wall of the second desulfurization tank is provided with a plurality of driving grooves, a plurality of first chains are provided in the driving grooves, adjacent rotating shafts are connected by first chain transmission, and a driving mechanism for driving the rotating shaft to rotate is provided in the desulfurization tank.

[0021] Furthermore, the driving mechanism includes a synchronization rod and a synchronization groove. Two synchronization grooves are provided in the second desulfurization tank. The synchronization grooves are respectively arranged on both sides of the driving groove. One of the synchronization grooves is connected to the driving groove above one group of filter plates, and the other synchronization groove is connected to the driving groove above the other group of filter plates. The synchronization rod can be arranged in the synchronization groove so as to move back and forth. A plurality of rotatably connected synchronization gears are provided in the synchronization groove. A second chain connected to the synchronization gears and the corresponding rotating shafts is provided. A rack meshing with the corresponding synchronization gear is provided on one side of the synchronization rod. A fixedly connected hydraulic rod is provided in the synchronization groove. The hydraulic rod is fixedly connected to the synchronization rod.

[0022] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The design of the baffle can achieve liquid separation through the collision between the baffle and the casing gas: the casing gas continuously hits the baffle and continuously changes the flow direction to achieve the purpose of gas-liquid separation, thereby reducing the pressure of subsequent filtration by the filter plate. With the addition of the filter plate, the casing gas passes through the stainless steel corrugated wire mesh, and while capturing the liquid for the second time, the solid impurities in the casing gas are filtered out, and the separation efficiency of impurities in the casing gas can be further improved by filtering. 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 bin for deep desulfurization, which can effectively realize the desulfurization of the casing gas. After the desulfurization is completed, it passes through the top of the bin body and enters the gas heating furnace for combustion.

[0023] 2. Divide the filter plates into two groups. At the same time, the filter plates are composed of multiple filter sub-plates. In conjunction with the rotation of the filter sub-plates, the up and down movement of the cleaning tubes, and the unfolding and recovery of the blocking cloth, one group of filter plates can be formed into a working state during normal filtration, and the other group can be rotated to be perpendicular to the filter plates. In this way, one group of filter plates can perform the filtering function normally, while the other group will not be filtered due to the rotation and opening of the filter sub-plates and the unfolding of the blocking cloth, and impurities cannot enter the mesh due to the obstruction of the blocking cloth.

[0024] 3. When one group of filter plates has been filtering for a certain period of time and the mesh is seriously clogged, the other group of vertically distributed filter plates can be rotated to the working state first, and the blocking cloth can be controlled to be recovered. Then the seriously clogged filter plates can be rotated to be open and parallel to each other. In this way, the filter plates can be automatically replaced, while ensuring the original filtering efficiency remains unchanged and preventing clogging. After the blocked filter plates are rotated, they can be automatically cleaned by unfolding the blocking cloth and cooperating with the up and down movement of the cleaning pipe. At the same time, the impurities after cleaning can be directly discharged through the recovery tank and the sewage tank. In this way, there is no need to disassemble the filter plates for cleaning or replacement, and the filter plates can be automatically cleaned directly. This is more convenient and quick, and will not affect the overall filtering efficiency.

[0025] 4. Improve the separation effect of gas-liquid and gas-solid, realize automatic sewage discharge, improve the dehydration effect, reduce the labor intensity of employees, reduce the pollution of desulfurization catalysts, improve desulfurization efficiency, and reduce hazardous solid waste.

[0026] 5. While reducing energy consumption and improving efficiency, it also greatly reduces the impact on the environment. The experimental results show that after using this desulfurization purification device, the hydrogen sulfide content in the emissions at the end of the gas furnace has been reduced to ≤10ppm.

[0027] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0028] Features described and / or illustrated with respect to 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.

[0029] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present invention. Among them: Figure 1 A schematic diagram of a three-dimensional structure provided in Example 1 of the present invention; Figure 2 A schematic diagram of a top view of the filter sub-plate provided in Example 2 of the present invention; Figure 3 A schematic diagram of the side cross-sectional connection structure of a second desulfurization pipe provided in Example 2 of the present invention; Figure 4 A schematic diagram of a three-dimensional structure of a filter plate composed of filter sub-plates provided in Example 2 of the present invention; Figure 5 A schematic diagram of the connection structure between the water retaining plate and the rotating shaft provided in Example 2 of the present invention; Figure 6 A schematic diagram of a top cross-sectional structure of a filter sub-plate provided in Example 2 of the present invention; Figure 7 A schematic diagram of the cross-sectional connection structure of the synchronization groove and the synchronization rod provided in Example 2 of the present invention; In the figure: 1, first desulfurization tank; 11, air intake pipe; 12, baffle; 2. Second desulfurization tank; 21. Filter plate; 210. Upper horizontal frame; 211. Filter plate; 212. First vertical frame; 213. Second vertical frame; 2131. Recovery shaft; 2132. Storage bin; 2133. Pull rod; 2134. Material blocking cloth; 214. Recovery trough; 215. Lower horizontal frame; 216. Slide; 217. Linkage; 218. Card slot; 219. Crossing slot; 22. Cleaning box; 221. Guide pipe; 222. Connecting slot; 223. Feeding slot; 224. Cleaning pipe; 225. Telescopic pipe; 226. Water baffle; 23. Synchronous rod; 231. Synchronous groove; 232. Hydraulic rod; 233. Synchronous gear; 234. Second chain; 24, rotating shaft; 241, first groove; 242, adjusting hole; 25. driving trough; 26. first chain; 27. drainage trough; 271. return trough; 3. The third desulfurization tank; 31. Exhaust pipe. DETAILED DESCRIPTION

[0031] In the following description of the present invention, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships 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 direction.

[0032] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific diagrams. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Example

[0034] like Figure 1 As shown, the wellhead casing gas self-cleaning desulfurization and purification device without disassembly of the present invention comprises a first desulfurization tank 1, a second desulfurization tank 2 and a third desulfurization tank 3. The air inlet end of the first desulfurization tank 1 is provided with an air inlet pipe 11, and connecting pipes are provided between the first desulfurization tank 1, the second desulfurization tank 2 and the third desulfurization tank 3. An exhaust pipe 31 is provided at the discharge end of the third desulfurization tank 3. The upper and lower inner circumferential walls in the first desulfurization tank 1 are provided with a plurality of baffles 12 which are staggered up and down. The baffle 12 connected to the upper inner wall extends below the horizontal diameter line, and the baffle 12 connected to the lower inner wall extends above the horizontal diameter line.

[0035] A plurality of filter plates 21 are sequentially arranged in the second desulfurization tank 2 along the airflow direction. A cleaning mechanism which can move up and down and is used for cleaning the mesh is also arranged on the filter plate 21. The third desulfurization tank 3 is filled with desulfurization adsorption particles.

[0036] The staggered design of the baffle 12 can achieve efficient gas-liquid separation through the collision between the baffle 12 and the casing gas: the natural gas continuously hits the baffle 12 and continuously changes the flow direction to achieve the purpose of gas-liquid separation, thereby reducing the load of subsequent filtering of the filter plate 21. With the addition of the filter plate 21, the casing gas passes through the stainless steel corrugated wire mesh, and while capturing the liquid for the second time, it filters out solid impurities in the casing gas, and can further improve the separation efficiency of impurities in the casing gas by filtering. Finally, it enters the third desulfurization tank 3, and utilizes the adsorption of the desulfurization adsorption particles. After the secondary purification, the casing gas enters the desulfurization bin, which can effectively achieve the desulfurization of the casing gas. After the desulfurization is completed, it is discharged from the exhaust pipe 31 on the top of the bin body and enters the gas heating furnace for combustion. Example

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in this embodiment, two groups of filter plates 21 are provided, and the two groups of filter plates 21 are staggered. The filter plates 21 include filter sub-plates 211. There are multiple filter sub-plates 211. One side of the filter sub-plate 211 is provided with a first vertical frame 212 that is fixedly connected, and the other side of the filter sub-plate 211 is provided with a second vertical frame 213 that is fixedly connected. The upper end of the filter sub-plate 211 is provided with an upper horizontal frame 210 that is fixedly connected, and the bottom of the filter sub-plate 211 is provided with a lower horizontal frame 215 that is fixedly connected.

[0038] The cleaning mechanism includes a cleaning pipe 224, a cleaning box 22 and a delivery pump. The cleaning pipe 224 is provided with a plurality of cleaning holes opening toward the filter plate 211. A cleaning box 22 is provided on one side of the second desulfurization tank 2. A delivery pump is provided in the cleaning box 22. A cleaning pipe 224 is provided on both sides of the filter plate 211 so as to be movable up and down, and is used to perform bidirectional cleaning on the filter holes of the filter plate 211. A flow guide pipe 221 connected to the cleaning pipe 224 is provided at the output end of the delivery pump. A material blocking cloth 2134 that can be opened and closed and is used to seal the filter plate 211 is provided on one 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 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 tank 27.

[0039] The filter plates 21 are divided into two groups that work alternately. At the same time, the filter plates 21 are formed by combining multiple filter sub-plates 211. In combination with the rotation of each filter sub-plate 211, the up-and-down movement of the cleaning tube 224, and the expansion and recovery of the blocking cloth 2134, one group can be formed into a filter plate 21 that is assembled into a complete plane during normal filtering, and the filter plate 21 enters the filtering working state. The filter sub-plates 211 of the other group are rotated to be perpendicular to the filter plates 21, so that the filter plates 21 of one group can normally realize the filtering function, while the other group will not be filtered due to the rotation of each filter sub-plate 211 and the expansion of the blocking cloth 2134, and impurities cannot enter the mesh of the filter sub-plate 211 due to the obstruction of the blocking cloth 2134.

[0040] When one group of filter plates 21 has been filtering for a certain period of time and the mesh is seriously clogged, the other group of vertical filter sub-plates 211 can be rotated to the filter plate 21 in the working state, and the blocking cloth 2134 can be controlled to be recovered. Then, the seriously clogged filter plate 21 can be rotated 90 degrees to be parallel to each other. In this way, the filter plate 21 can be automatically replaced from the working state to the clean standby state, while ensuring that the original filtering efficiency remains unchanged and clogging is prevented. After the blocked filter sub-plate 211 is rotated, it can be automatically cleaned by unfolding the blocking cloth 2134 and cooperating with the up and down movement of the cleaning pipe 224, and the impurities after cleaning can be directly discharged through the recovery tank 214 and the sewage tank 27. In this design method, there is no need to disassemble the filter plate 21 for cleaning or replacement, and the automatic cleaning of the filter plate 21 can be directly realized, which is more convenient and quick, and will not affect the overall filtering efficiency.

[0041] like Figure 3 and Figure 5As shown, in this embodiment, the top center of the upper transverse frame 210 and the bottom center of the lower transverse frame 215 are both provided with a fixedly connected rotating shaft 24, so that the upper transverse frame 210, the lower transverse frame 215, the filter plate 211, the first vertical frame 212 and the second vertical frame 213 can rotate as a whole. The rotating shaft 24 is respectively 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 groove 223 that is connected to the rotating shaft 24 and sealed, and adjacent feed grooves 223 are provided with a connected connecting groove 222, and the guide pipe 221 is connected to the adjacent feed groove 223.

[0042] Two axially penetrating adjustment holes 242 are arranged in the rotating shaft 24 on the upper horizontal frame 210. The two adjustment holes 242 are located on the same diameter line and are symmetrically arranged. The diameter line where the two adjustment holes 242 are located is perpendicular to the filter sub-plate 211 and is respectively located on both sides of the filter sub-plate 211. A fixedly connected telescopic tube 225 is arranged in the adjustment hole 242. The lower end of the telescopic tube 225 passes through the upper horizontal frame 210 and is connected to the cleaning tube 224. An elastic member is arranged in the telescopic tube 225 for driving the telescopic tube 225 to automatically restore the initial position. Among them, a fixedly connected and symmetrically distributed water baffle 226 is arranged at the bottom of the feed trough 223. The two water baffles 226 are symmetrical crescent-shaped, and a flow slot is formed between the two water baffles 226. The design of the water baffle 226 ensures that the feed slot 223 is connected to the telescopic tube 225 in the corresponding adjustment hole 242 only when the filter sub-plates 211 rotate to be parallel to each other, thus ensuring that the cleaning tube 224 can perform spray cleaning only when the filter sub-plates 211 rotate to be parallel to each other. When the filter sub-plates 211 rotate to be flush with each other, that is, when the filter sub-plates 211 are assembled into a complete filter plate 21, the two adjustment holes 242 enter the lower part of the corresponding water baffle 226 respectively, cutting off the water source of the telescopic tube 225.

[0043] The design of the telescopic tube 225 can utilize hydraulic means to achieve automatic extension of the telescopic tube 225, and realize automatic downward spray cleaning of the cleaning tube 224. The elastic member can be a spring or an elastic band, and after cleaning, the cleaning tube 224 can be automatically retracted by elastic force, and the cleaning tube 224 can be moved up and down to clean the mesh.

[0044] like Figure 3 As shown, in this embodiment, a reflux groove 271 is provided at the bottom of the second desulfurization tank 2, and the end of the reflux groove 271 is connected to the sewage groove 27, and a first groove 241 connected to the recovery groove 214 is provided in the rotating shaft 24 located below the lower horizontal frame 215, and the lower end of the first groove 241 is connected to the reflux groove 271.

[0045] like Figure 6As shown, in this embodiment, two storage bins 2132 are provided in the second vertical frame 213, and the two storage bins 2132 are respectively provided with a rotatably connected recovery shaft 2131, and the blocking cloth 2134 is respectively wound on the recovery shaft 2131, and the recovery shaft 2131 is provided with a ruler spring for driving the blocking cloth 2134 to wind and recover, and the storage bin 2132 is provided with an inlet and an outlet at the corner facing the outer side of the filter plate 211, and a pull rod 2133 is provided in the inlet and outlet, and the extension end of the blocking cloth 2134 is fixedly connected to the pull rod 2133, and the first The vertical frame 212 is provided with a slot 218 that engages with the pull rod 2133. The slot 218 is provided with a through slot 219 at both the upper and lower ends. A bendable linkage part 217 is provided in the through slot 219. The linkage part 217 can be a steel wire rope. One end of the linkage part 217 is fixedly connected to the inner wall of the corresponding second desulfurization tank 2, and the other end of the linkage part 217 is fixedly connected to the corresponding end of the pull rod 2133. The upper horizontal frame 210 and the lower horizontal frame 215 are provided with a slide groove 216 for moving the material blocking cloth 2134 in and out.

[0046] The design of the ruler spring can realize the automatic recovery of the material blocking cloth 2134, and the design of the linkage member 217 and the pull rod 2133 can realize the automatic unfolding of the material blocking cloth 2134 through the transmission of the linkage member 217 after the filter plate 211 rotates.

[0047] like Figure 7 As shown, in this embodiment, a plurality of driving grooves 25 are provided on the inner wall of the second desulfurization tank 2, a plurality of first chains 26 are provided in the driving grooves 25, adjacent rotating shafts 24 are connected by the first chains 26, and a driving mechanism for driving the rotating shafts 24 to rotate is provided in the desulfurization tank.

[0048] In this embodiment, the driving mechanism includes a synchronization rod 23 and a synchronization groove 231. Two synchronization grooves 231 are provided in the second desulfurization tank 2. The synchronization grooves 231 are respectively arranged on the outer side of the end of the driving groove 25. One synchronization groove 231 is connected to the driving groove 25 above one group of filter plates 21, and the other synchronization groove 231 is connected to the driving groove 25 above the other group of filter plates 21. The synchronization rod 23 can be moved back and forth in the synchronization groove 231. A plurality of rotatably connected synchronization gears 233 are provided in the synchronization groove 231. A second chain 234 connected to the synchronization gear 233 and the corresponding rotating shaft 24 are provided. A rack meshing with the corresponding synchronization gear 233 is provided on one side of the synchronization rod 23. A fixedly connected hydraulic rod 232 is provided in the synchronization groove 231. The hydraulic rod 232 is connected to the end of the synchronization rod 23.

[0049] The reciprocating translation of the synchronization rod 23 is achieved through the extension and retraction of the hydraulic rod 232, and the design of the rack, the synchronization gear 233, the first chain 26 and the second chain 234 realizes the rotation control of the filtering sub-plates 211 in different groups.

[0050] When the purification device is in use: First, the casing gas enters the first desulfurization tank 1 through the air inlet pipe 11, and then passes through the baffle 12 in sequence. The casing gas continuously hits the baffle 12 and continuously changes its flow direction to achieve gas-liquid separation.

[0051] The separated casing gas enters the second desulfurization tank 2 through the connecting pipe. In the second desulfurization tank 2, there are two groups of filter plates 21, wherein the filter sub-plates 211 in the first group of filter plates 21 are rotated to be parallel to each other, and the filter sub-plates 211 in the second group are flush with each other. The casing gas passes through the first group of filter sub-plates 211 and is filtered by the mesh holes on the second group of filter sub-plates 211. In this way, the filter sub-plates 211 of the second group filter sub-plates filter the casing gas in turn.

[0052] When the filter plates 211 of the second group have been filtering for a certain period of time and the mesh is about to be blocked, the hydraulic rod 232 is started to drive the synchronization rod 23 to move. Through the transmission of the rack and the synchronization gear 233, the rotating shafts 24 of the first group rotate synchronously, so that the filter plates 211 in the first group are changed from being parallel to each other to being aligned with each other, so that the filter plates 211 form an integral filter plate 21, and then the rotating shafts 24 of the second group are controlled to rotate synchronously, so that the filter plates 211 in the second group are changed from being aligned with each other to being parallel to each other.

[0053] When the first set of rotating shafts 24 rotate, the linkage 217 and the blocking cloth 2134 can be automatically recovered under the action of the ruler spring, so that the blocking cloth 2134 outside the filter sub-plate 211 is automatically recovered into the storage bin 2132, and each filter sub-plate 211 is opened, so that the filter sub-plate 211 can start the filtering function. When the second set of rotating shafts 24 rotate, the linkage 217 can drive the pull rod 2133 to automatically move outward, so that the pull rod 2133 moves from the second vertical frame 213 to the first vertical frame 212, and the blocking cloth 2134 can be automatically unfolded, so that the blocked filter sub-plate 211 is automatically sealed.

[0054] When the filter sub-plates 211 of the second group are rotated into shape, the delivery pump is started to automatically deliver the cleaning liquid in the cleaning box 22 to the corresponding cleaning pipe 224, and spray it out through the cleaning holes. As the water pressure increases, the cleaning pipe 224 can be driven to move downward automatically, thereby realizing automatic downward spray cleaning of the cleaning pipe 224. After cleaning, the delivery pump is turned off, and the telescopic tube 225 is automatically recovered under the action of the elastic member. Due to the existence of the material blocking cloth 2134, natural gas will not enter the inside of the material blocking cloth 2134, and the cleaning liquid will not enter the second desulfurization tank 2 during cleaning.

[0055] After the filter plate 211 is cleaned, the cleaned sewage enters the first tank 241 through the recovery tank 214 and is then discharged through the reflux tank 271 and the sewage tank 27 .

[0056] When the filter sub-plates 211 of the second group are about to be clogged, the first group and the second group can be directly replaced in the above-mentioned manner, so that the first group can filter again and the filter sub-plates 211 of the second group can be cleaned.

[0057] After removing moisture and impurities, the casing gas enters the desulfurization chamber for deep desulfurization. Solid desulfurizer ferric hydroxide is preferred in the desulfurization chamber. The agent is loaded at 30L / chamber and the replacement cycle can reach more than half a year. The desulfurization effect can be far better than the national standard.

[0058] Taking Zhou 38-3 well site as an example, the wellhead gas furnace uses casing gas with high hydrogen sulfide content transported by Zhou 43, with a hydrogen sulfide content of about 2500ppm. It is also the wellhead gas furnace with the highest hydrogen sulfide content in the Zhousong Oil Production Station. The hydrogen sulfide content in the flue gas emissions of the wellhead gas furnace in the well site seriously exceeds the standard. According to regulations, the furnace should be shut down and replaced with the spare 10KV•A medium-frequency electric heating. Therefore, this desulfurization and purification device was chosen to be installed in Zhou 38-3 well site for testing.

[0059] During the test, the hydrogen sulfide content at the front end of the desulfurization device was measured to be 2500 ppm, the hydrogen sulfide content at the end of the desulfurization device was 350 ppm, and the sulfur content at the exhaust port of the gas furnace was ≤10 ppm. The operator only needs to check and record the data on a daily basis, and there are no other management matters.

[0060] Because the function of this gas furnace is to raise the temperature at the end of the long-distance transmission trunk line, the medium-frequency electric heating is turned on 24 hours a day, of which 8 months are selected for heating mode, and the remaining 4 months are selected for unblocking mode. Based on the average electricity price of 0.7 yuan / kWh, the annual power cost is: (10×50%×24×245+10×80%×24×120)×0.7=37,000 yuan After the natural gas is dehydrated, impurity-removed and desulfurized by this desulfurization and purification device, the corrosion to equipment and process pipelines is greatly reduced. For example, in previous years, when repairing the gas furnace, it was found that the inside of the first-stage pressure reducing valve and the rubber pad of the air intake solenoid valve were seriously corroded. This was caused by high-sulfur natural gas, and they needed to be replaced 2-3 times a year. After desulfurization, the maintenance cost of these two equipment can be saved by about 20,000 yuan per year.

[0061] Coupled with reducing equipment damage, the economic benefits are even more obvious; in addition, reducing hydrogen sulfide emissions reduces harm to employees' health and reduces safety and environmental risks, with obvious social and environmental benefits.

[0062] The above is only a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation modes without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. The technical features not described in the present invention can be realized by or using existing technologies, which will not be repeated here.

Claims

1. A wellhead casing gas self-cleaning desulfurization purification device without disassembly, characterized in that: It comprises a first desulfurization tank, a second desulfurization tank and a third desulfurization tank. The air inlet end of the first desulfurization tank is provided with an air inlet pipe. The first desulfurization tank, the second desulfurization tank and the third desulfurization tank are provided with connecting pipes between the head and tail. The discharge end of the third desulfurization tank is provided with an exhaust pipe. The upper and lower ends of the first desulfurization tank are provided with a plurality of baffles distributed in an interlaced manner. The second desulfurization tank is provided with a plurality of filter plates in sequence along the air flow direction. The filter plates are also provided with a cleaning mechanism which can move up and down and is used for cleaning the mesh. The third desulfurization tank is provided with desulfurization adsorption particles.

2. The wellhead casing gas self-cleaning desulfurization purification device according to claim 1 is characterized in that: The filter plates are divided into two groups, which are staggered. The filter plates are composed of a plurality of filter sub-plates. A first vertical frame is fixedly connected on one side of each filter sub-plate, and a second vertical frame is fixedly connected on the other side of each filter sub-plate. An upper horizontal frame is fixedly connected on the upper end of the filter sub-plate, and a lower horizontal frame is fixedly connected on the bottom of the filter sub-plate.

3. The wellhead casing gas self-cleaning desulfurization purification device according to claim 2 is characterized in that: The cleaning mechanism includes a cleaning pipe, which is provided with a plurality of cleaning holes facing the opening of the filter plate. A cleaning box is provided on one side of the second desulfurization tank, and a conveying pump is provided in the cleaning box. The cleaning pipe can be arranged on one side or both sides of the filter plate so as to move up and down, and extends along the width direction of the filter plate.

4. The wellhead casing gas self-cleaning desulfurization purification device according to claim 3 is characterized in that: The cleaning mechanism also includes a cleaning box and a delivery pump. The output end of the delivery pump is provided with a guide pipe 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 tank, and the bottom of the recovery tank is connected to the sewage tank.

5. The wellhead casing gas self-cleaning desulfurization purification device according to claim 4 is characterized in that: A reflux groove is provided at the bottom of the second desulfurization tank, and the end of the reflux groove is connected to the sewage groove. A first groove connected to the recovery groove is provided in the rotating shaft below the lower horizontal frame, and the first groove is connected to the reflux groove.

6. The wellhead casing gas self-cleaning desulfurization purification device according to claim 2 is characterized in that: A rotating shaft extending upward is fixed at the top center of the upper transverse frame, and a rotating shaft extending downward is fixed at the bottom center of the lower transverse frame. The rotating shafts are rotatably connected to the inner wall of the second desulfurization tank respectively.

7. The wellhead casing gas self-cleaning desulfurization purification device according to claim 6 is characterized in that: The upper inner wall of the second desulfurization tank is also provided with a feed trough which rotates with the rotating shaft and is sealed, and adjacent feed troughs are provided with interconnected communication troughs, and the guide pipe is connected with adjacent feed troughs.

8. The wellhead casing gas self-cleaning desulfurization purification device according to claim 7 is characterized in that: Two axially penetrating adjustment holes are provided in the rotating shaft located on the upper horizontal frame. The two adjustment holes are located on the same diameter line and symmetrically located on both sides of the filter plate. A fixedly connected telescopic tube is provided in the adjustment hole. The lower end of the telescopic tube passes through the upper horizontal frame and is connected to the cleaning tube. An elastic member is provided in the telescopic tube for driving the telescopic tube to automatically restore its initial position.

9. The wellhead casing gas self-cleaning desulfurization purification device according to claim 3 is characterized by: A material blocking cloth which can be opened and closed and is used for sealing the filter sub-plate is provided on one side of the second vertical frame.

10. The wellhead casing gas self-cleaning desulfurization purification device according to claim 9, characterized in that: Two storage bins are provided in the second vertical frame, and rotatably connected recovery shafts are respectively provided in the storage bins, and the material blocking cloths are respectively wound on the recovery shafts, and the recovery shafts are provided with ruler springs for driving the material blocking cloths to be wound and recovered; the storage bins are provided with inlets and outlets at the outer corners facing the filter plate, and the inlets and outlets are provided with pull rods fixedly connected to the extended ends of the material blocking cloths, and the first vertical frame is provided with a slot engaged with the pull rod, and the slots are provided with through-type through slots at both upper and lower ends, and a bendable linkage part is provided in the through slot, and one end of the linkage part is fixedly connected to the corresponding inner wall of the second desulfurization tank, and the other end of the linkage part is fixedly connected to the corresponding end of the pull rod, and the upper and lower horizontal frames are provided with sliding grooves for moving the material blocking cloths in and out.

11. The wellhead casing gas self-cleaning desulfurization purification device according to claim 2, characterized in that: The upper inner wall of the second desulfurization tank is provided with a plurality of driving grooves, a plurality of first chains are provided in the driving grooves, adjacent rotating shafts are connected by first chain transmission, and a driving mechanism for driving the rotating shaft to rotate is provided in the desulfurization tank.

12. The wellhead casing gas self-cleaning desulfurization purification device according to claim 11, characterized in that: The driving mechanism includes a synchronization rod and a synchronization groove. Two synchronization grooves are provided in the second desulfurization tank. The synchronization grooves are respectively arranged on both sides of the driving groove. One of the synchronization grooves is communicated with the driving groove above one group of filter plates, and the other synchronization groove is communicated with the driving groove above the other group of filter plates. The synchronization rod can be arranged in the synchronization groove so as to move back and forth. A plurality of rotatably connected synchronization gears are provided in the synchronization groove. A second chain connected to the synchronization gears and the corresponding rotating shafts is provided. A rack meshing with the corresponding synchronization gear is provided on one side of the synchronization rod. A fixedly connected hydraulic rod is provided in the synchronization groove. The hydraulic rod is fixedly connected to the synchronization rod.

Images