Oilfield natural gas tail gas recovery device

Abstract

The invention provides an oil field natural gas tail gas recovery device. The oil field natural gas tail gas recovery device comprises a base, the base is in a right trapezoid shape, the inclined face of the base faces downwards, the top end of the base is fixedly connected with a supporting frame, the top end of the supporting frame is fixedly connected with a refrigeration part, and a condensation part is arranged on the refrigeration part. According to the oil field natural gas tail gas recovery device, the four sets of spiral condensation pieces are evenly distributed on the outer circular face of the connecting column, the condensation pieces penetrate through the inserting grooves of the collecting pipe to form an inner and outer double-layer contact structure, cooling liquid in the closed cavity is matched, the condensation pieces are fully wrapped through the circulation grooves, and the heat exchange efficiency of the condensation pieces is greatly improved; meanwhile, the spiral structure enables the tail gas to form rotational flow in the collecting pipe, the contact time of the tail gas and a condensation face is prolonged, oil mist and water vapor in the tail gas are fully condensed and separated out, the tail gas liquid removal efficiency and effect are effectively improved, liquid drops are rapidly collected and slide down through uniform arrangement of the multiple sets of liquid drainage grooves, and it is avoided that a liquid film is formed to affect heat exchange.

Description

An oilfield natural gas tail gas recovery device Technical Field

[0001] This invention relates to the field of natural gas tail gas recovery equipment, and more particularly to an oilfield natural gas tail gas recovery device. Background Technology

[0002] Oilfield natural gas tail gas refers to various low-concentration, dispersed natural gas mixtures generated during the entire process of oil and gas extraction, gathering, transportation, purification, and station operation and maintenance. It is often referred to as associated tail gas or gathering and transportation tail gas, and is a byproduct of oilfield production. Distinguished from the pure natural gas extracted from gas fields, it is formed due to process emissions, separation venting, and minor leaks. Its composition and calorific value are lower than conventional commercial natural gas, making it a key gaseous waste product for oilfield recovery and treatment. Existing oilfield natural gas tail gas condensation and deliquescing equipment, when processing low-concentration, dispersed tail gas, suffers from insufficient contact between the tail gas and the condensing medium, resulting in short contact times. This makes it difficult for oil mist and water vapor in the tail gas to completely condense and precipitate, failing to achieve optimal deliquescing. Furthermore, the condensed droplets are not easily collected and discharged quickly, easily forming a liquid film in the condensation area, further affecting subsequent heat exchange. This makes it difficult to fully adapt to the processing characteristics of oilfield tail gas and hinders its efficient recovery and resource utilization. Therefore, it is necessary to provide an oilfield natural gas tail gas recovery device to solve the above-mentioned technical problems. Summary of the Invention

[0003] This invention provides an oilfield natural gas tail gas recovery device, which solves the problem that existing oilfield natural gas tail gas condensation and deliquescence equipment, when treating low-concentration, dispersed tail gas, suffers from insufficient contact between the tail gas and the condensing medium, and the contact time is too short. As a result, the oil mist and water vapor in the tail gas cannot be completely condensed and precipitated, and the deliquescence effect is not optimal. At the same time, the condensed droplets are not easy to quickly collect and discharge, and are prone to forming a liquid film in the condensation area, which further affects the subsequent heat exchange effect. It is difficult to fully adapt to the treatment characteristics of oilfield tail gas and is not conducive to the efficient recovery and resource utilization of tail gas. To solve the above-mentioned technical problems, the present invention provides an oilfield natural gas tail gas recovery device, comprising: a base, the base being a right-angled trapezoid with the inclined surface facing downwards; a support frame fixedly connected to the top of the base; a refrigeration component fixedly connected to the top of the support frame; a condenser component disposed on the refrigeration component; and a collection box fixedly connected to the top of the base; the refrigeration component including an outer tube fixedly connected to the top of the support frame; the condenser component including spiral condenser plates fixedly connected to the inner wall of the outer tube; a connecting column fixedly connected to the inner side of the condenser plates; four sets of condenser plates evenly distributed on the outer circular surface of the connecting column; a sealing ring fixedly connected to the end face of the outer tube; two sets of sealing rings symmetrically distributed on both sides of the outer tube; a collection tube sleeved on the outer side of the connecting column; a slot penetrating the outer circular surface of the collection tube; the condenser plates penetrating the slot and fixedly connected to the connecting column; and both ends of the collection tube abutting against a set of sealing rings respectively, with the outer side of the outer tube flush with the outer side of the sealing rings and the inner side of the collection tube flush with the inner side of the sealing rings, thus creating a sealed cavity between the outer tube and the collection tube. Preferably, the condenser plate is uniformly provided with a drain groove and a flow groove. The drain groove is located inside the collection tube, and its bottom end is flush with the inner wall of the collection tube. The flow groove is located between the outer tube and the collection tube, and its bottom end is flush with the inner wall of the outer tube. Multiple sets of drain grooves and flow grooves are uniformly provided on each set of condenser plates. Water droplets and oil droplets precipitated from the condenser plate move from high to low in the collection tube through the drain groove. Preferably, an air inlet pipe and an air outlet pipe are fixedly connected to the side ends of the two sets of closed rings, respectively. The air inlet pipe is connected to the set of closed rings located at the lower position, and the air outlet pipe is connected to the set of closed rings located at the higher position. The air inlet pipe is conical, and its large-diameter end is fixedly connected to the closed ring. Preferably, a filter plate for filtering large particulate impurities in the exhaust gas is fixedly connected inside the intake pipe. Multiple sets of filter holes are uniformly opened through the filter plate. A filter block for filtering out residual tiny oil mist droplets and water mist droplets in the exhaust gas is fixedly connected inside the exhaust pipe. The inner layer of the filter block is made of oleophilic polypropylene fiber material for removing oil mist, and the outer layer is made of hydrophilic borosilicate glass fiber material for removing water mist, forming a double-layer coalescing structure that simultaneously captures tiny oil and water mist droplets.Preferably, a funnel-shaped liquid separator is fixedly connected to the side of the filter plate facing the collection pipe. The liquid separator has an L-shaped cross-section on one side, with the smaller diameter end of the funnel-shaped liquid separator facing the collection pipe. The diameter of the smaller diameter end of the liquid separator is smaller than that of the inner side of the closed ring. A dropper groove is provided through the bottom end of the air inlet pipe. The dropper groove is located below the liquid separator and directly above the collection box. Water droplets and oil droplets precipitated from the condenser move from high to low in the collection pipe through the drain groove until they flow between the liquid separator and the air inlet pipe, and fall into the collection box through the dropper groove. Preferably, an outlet hopper and an inlet hopper are connected through the bottom end of the outer pipe. The outlet hopper is located on the lower side of the outer pipe, and the inlet hopper is located on the higher side of the outer pipe. An outlet pipe is connected through the bottom end of the inlet hopper, and an inlet pipe is connected through the bottom end of the outlet hopper. Preferably, a liquid storage tank is fixedly connected to the top of the base, and the liquid storage tank is located directly below the outer tube. One end of the liquid inlet pipe is connected to the liquid storage tank. A pump is fixedly connected to the top of the base. The output end of the pump is connected to the liquid outlet pipe, and the input end of the pump is connected to the liquid storage tank. Preferably, a heat-conducting plate is fixedly connected to one end of the liquid storage tank. A heat-absorbing plate is fixedly connected to the side of the heat-conducting plate facing the liquid storage tank. Multiple sets of heat-absorbing plates are evenly distributed on one side of the heat-conducting plate. A semiconductor cooling component is fixedly connected to the side of the heat-conducting plate away from the liquid storage tank. The semiconductor cooling component uses a ceramic substrate as the encapsulation substrate and has N- and P-type semiconductor thermocouple arms connected in series. Utilizing the Peltier effect, when a direct current is applied, one end of the component attached to the heat-conducting plate quickly absorbs and cools down, while the other end simultaneously releases heat. The heat is dissipated in conjunction with a cooling fan. Three sets of semiconductor cooling components are evenly distributed on one side of the heat-conducting plate. Compared with related technologies, the oilfield natural gas tail gas recovery device provided by the present invention has the following beneficial effects: (1) The present invention provides an oilfield natural gas tail gas recovery device, which uses four sets of spiral condensing plates evenly distributed on the outer circular surface of the connecting column, and the condensing plates penetrate the slot of the collection pipe to form an inner and outer double-layer contact structure. With the coolant in the sealed cavity fully covering the condensing plates through the flow groove, the heat exchange efficiency of the condensing plates is greatly improved. At the same time, the spiral structure allows the tail gas to form a swirling flow in the collection pipe, prolonging the contact time between the tail gas and the condensing surface, so that the oil mist and water vapor in the tail gas are fully condensed and precipitated, effectively improving the efficiency and effect of tail gas deliquescence. In addition, the uniform arrangement of multiple sets of drainage grooves allows the droplets to quickly collect and slide down, avoiding the formation of liquid film that affects heat exchange. (2) This invention provides an oilfield natural gas tail gas recovery device. By setting filter plates and filter blocks in a graded manner on the tail gas flow path, the impurities in the tail gas are removed step by step. The filter plates first intercept large particulate impurities, and the filter blocks then capture tiny droplets through a double-layer coalescing structure. At the same time, the funnel-shaped structure of the liquid separator can effectively prevent the droplets in the collection pipe from being carried away by the tail gas backflow. With the precise alignment of the drop trough and the collection box, the condensate droplets are collected in a directional manner without residue. This not only ensures the purification accuracy of the tail gas, but also avoids the secondary pollution of the tail gas caused by the droplet backflow, thus improving the overall processing stability of the device. Figure 1 is a schematic diagram of a preferred embodiment of the oilfield natural gas tail gas recovery device provided by the present invention; Figure 2 is a schematic diagram of the overall structure provided by the present invention; Figure 3 is a schematic diagram of the structure of the collection pipe provided by the present invention; Figure 4 is a schematic diagram of the structure of the slot provided by the present invention; Figure 5 is a schematic diagram of the structure of the filter plate provided by the present invention; Figure 6 is a schematic diagram of the structure of the liquid separator provided by the present invention; Figure 7 is a schematic diagram of the structure of the cooling component provided by the present invention; Figure 8 is a schematic diagram of the structure of the heat absorption plate provided by the present invention. The following are the labels in the diagram: 1. Base, 2. Support frame, 3. Collection box, 4. Condenser, 41. Collection pipe, 42. Slot, 43. Condenser plate, 44. Connecting column, 45. Drainage trough, 46. Flow channel, 47. Sealing ring, 48. Air inlet pipe, 49. Exhaust pipe, 410. Liquid separator, 411. Liquid drop trough, 412. Filter plate, 413. Filter block, 5. Refrigeration component, 51. Liquid outlet hopper, 52. Liquid inlet hopper, 53. Liquid inlet pipe, 54. Liquid outlet pipe, 56. Liquid storage tank, 55. Pump, 57. Heat conduction plate, 58. Heat absorption plate, 59. Semiconductor cooling component, 510. Outer pipe. The specific embodiments are described below with reference to the accompanying drawings and embodiments. Please refer to Figures 1, 2, 3, 4, 5, 6, 7, and 8. Figure 1 is a structural schematic diagram of a preferred embodiment of the oilfield natural gas tail gas recovery device provided by the present invention; Figure 2 is a structural schematic diagram of the overall structure provided by the present invention; Figure 3 is a structural schematic diagram of the collection pipe provided by the present invention; Figure 4 is a structural schematic diagram of the slot provided by the present invention; Figure 5 is a structural schematic diagram of the filter plate provided by the present invention; Figure 6 is a structural schematic diagram of the liquid separator provided by the present invention; Figure 7 is a structural schematic diagram of the cooling component provided by the present invention; and Figure 8 is a structural schematic diagram of the heat absorption plate provided by the present invention. The oilfield natural gas tail gas recovery device includes: a base 1, which is a right-angled trapezoid with the inclined surface facing downwards; a support frame 2 is fixedly connected to the top of the base 1; a cooling component 5 is fixedly connected to the top of the support frame 2; a condenser 4 is provided on the cooling component 5; and a collection box 3 is fixedly connected to the top of the base 1. The refrigeration component 5 includes an outer tube 510 fixedly connected to the top of the support frame 2. A liquid outlet hopper 51 and a liquid inlet hopper 52 are connected through the bottom of the outer tube 510, with the liquid outlet hopper 51 located on the lower side of the outer tube 510 and the liquid inlet hopper 52 located on the higher side. A liquid outlet pipe 54 is connected through the bottom of the liquid inlet hopper 52, and a liquid inlet pipe 53 is connected through the bottom of the liquid outlet hopper 51. A liquid storage tank 56 is fixedly connected to the top of the base 1, and the liquid storage tank 56 is located directly below the outer tube 510. One end of the liquid inlet pipe 53 is connected through the liquid storage tank 56. A pump 55 is fixedly connected to the top of the base 1, with the output end of the pump 55 connected through the liquid outlet pipe 54 and the input end of the pump 55 connected through the liquid storage tank. The tank 56 is connected through, and a heat-conducting plate 57 is fixedly connected to one end of the liquid storage tank 56. A heat-absorbing plate 58 is fixedly connected to the side of the heat-conducting plate 57 facing the liquid storage tank 56. Multiple sets of heat-absorbing plates 58 are provided and are evenly distributed on one side of the heat-conducting plate 57. A semiconductor cooling component 59 is fixedly connected to the side of the heat-conducting plate 57 away from the liquid storage tank 56. The semiconductor cooling component 59 uses a ceramic substrate as the encapsulation substrate and has N and P type semiconductor thermocouple arms connected in series inside. Utilizing the Peltier effect, after applying DC current, one end of the component attached to the heat-conducting plate 57 quickly absorbs and cools down, while the other end releases heat simultaneously. The heat is dissipated in conjunction with a cooling fan. Three sets of semiconductor cooling components 59 are provided and are evenly distributed on one side of the heat-conducting plate 57. The above scheme utilizes a semiconductor cooling element 59 in conjunction with a heat-conducting plate 57 and multiple sets of heat-absorbing plates 58 to achieve efficient and uniform cooling of the coolant in the storage tank 56. A pump 55 provides continuous power for coolant circulation, allowing the coolant to enter the outer pipe 510 through the inlet pipe 53 and outlet hopper 51, and then flow back to the storage tank 56 through the inlet hopper 52 and outlet pipe 54, forming a closed-loop circulation system. By placing the outlet hopper 51 and inlet hopper 52 at the high and low ends of the outer pipe 510 respectively, the coolant is ensured to be fully filled and flow in one direction within the pipe. The outer pipe 510 provides a stable low-temperature heat exchange foundation for the condenser 4, significantly improving the overall efficiency and stability of condensation heat exchange. The condenser 4 includes spiral-shaped condenser fins 43 fixedly connected to the inner wall of the outer pipe 510.A connecting post 44 is fixedly connected to the inner side of the condenser plate 43. Four sets of condenser plates 43 are evenly distributed on the outer surface of the connecting post 44. A sealing ring 47 is fixedly connected to the end face of the outer tube 510. Two sets of sealing rings 47 are symmetrically distributed on both sides of the outer tube 510. A collecting tube 41 is sleeved on the outer side of the connecting post 44. A slot 42 is opened through the outer surface of the collecting tube 41. The condenser plate 43 passes through the slot 42 and is fixedly connected to the connecting post 44. Both ends of the collecting tube 41 abut against a set of sealing rings 47. The outer side of the outer tube 510 is flush with the outer side of the sealing ring 47, and the inner side of the collecting tube 41 is flush with the inner side of the sealing ring 47, so that there is a gap between the outer tube 510 and the collecting tube 41. A sealed cavity is created. Drainage channels 45 and flow channels 46 are evenly distributed on the condenser plate 43. The drainage channel 45 is located inside the collection pipe 41, and its bottom end is flush with the inner wall of the collection pipe 41. The flow channel 46 is located between the outer pipe 510 and the collection pipe 41, and its bottom end is flush with the inner wall of the outer pipe 510. Multiple drainage channels 45 and flow channels 46 are evenly distributed on each set of condenser plates 43. Water droplets and oil droplets precipitated from the condenser plate 43 move from high to low within the collection pipe 41 through the drainage channels 45. Two sets of closed rings 47 are respectively fixedly connected to an air inlet pipe 48 and an exhaust pipe 49 at their sides. The air inlet pipe 48 is connected to the lower... A set of closed rings 47 are connected at a certain position, and the exhaust pipe 49 is connected to a set of closed rings 47 located at a higher position. The intake pipe 48 is conical, and the large-diameter end of the intake pipe 48 is fixedly connected to the closed rings 47. A filter plate 412 for filtering large particulate impurities in the exhaust gas is fixedly connected inside the intake pipe 48. Multiple sets of filter holes are evenly opened on the filter plate 412. A filter block 413 for filtering out residual small oil mist droplets and water mist droplets in the exhaust gas is fixedly connected inside the exhaust pipe 49. The inner layer of the filter block 413 is made of oleophilic polypropylene fiber material for degreasing oil mist, and the outer layer is made of hydrophilic borosilicate glass fiber material for degreasing water mist, forming a double-layer aggregated structure to simultaneously capture micro-mist. Small oil and water droplets are filtered by a funnel-shaped liquid separator 410 fixedly connected to the side of the filter plate 412 facing the collection pipe 41. The cross-section of the liquid separator 410 is L-shaped on one side. The small diameter end of the funnel-shaped liquid separator 410 faces the collection pipe 41, and the diameter of the small diameter end of the liquid separator 410 is smaller than the inner side of the sealing ring 47. A drop trough 411 is opened through the bottom of the air inlet pipe 48. The drop trough 411 is located below the liquid separator 410 and directly above the collection box 3. The water droplets and oil droplets precipitated from the condenser plate 43 move from high to low in the collection pipe 41 through the drain trough 45 until they flow between the liquid separator 410 and the air inlet pipe 48, and fall into the collection box 3 through the drop trough 411. The above scheme employs four sets of spiral condenser fins 43 evenly distributed on the outer surface of the connecting column 44, significantly increasing the contact area between the exhaust gas and the condenser surface, while also extending the exhaust gas flow path. The sealed cavity formed by the collecting pipe 41 and the outer pipe 510, combined with the flow channel 46, allows the coolant to fully contact the condenser fins 43, improving heat exchange efficiency. The drain channel 45, flush with the inner wall of the collecting pipe 41, allows the condensed oil and water droplets to slide off smoothly.The filter plate 412 and filter block 413 remove impurities and tiny droplets from the exhaust gas in stages. The liquid separator 410 and the dropper 411 work together to collect condensed droplets in a directional manner, preventing them from being carried away by the exhaust gas. The working principle of the oilfield natural gas exhaust gas recovery device provided by this invention is as follows: Before starting the device, sufficient coolant is added to the storage tank 56. After completion, the power is turned on, and the three sets of semiconductor cooling elements 59 begin to work. Utilizing the Peltier effect, rapid heat absorption and cooling are achieved. The cooling capacity is transferred to multiple sets of heat-absorbing plates 58 through the heat-conducting plate 57. The heat-absorbing plates 58 are in full contact with the coolant in the storage tank 56, achieving uniform cooling of the coolant. Subsequently, the pump 55 is started, drawing low-temperature coolant from the storage tank 56 and transporting it to the inlet hopper 52 through the outlet pipe 54. The coolant enters the sealed cavity between the outer pipe 510 and the collection pipe 41 from the inlet hopper 52. Because the inlet hopper 52 is located at a higher position on the outer pipe 510, the cooling... The liquid flows downwards along the flow groove 46 on the condenser 43 within the cavity, fully covering the condenser 43 and completing heat exchange. The heated coolant flows out from the outlet 51 at the lower end of the outer pipe 510 and returns to the storage tank 56 through the inlet pipe 53, forming a continuous closed-loop coolant circulation, providing stable low-temperature heat exchange conditions for the condenser 4. The oilfield natural gas tail gas enters from the small-diameter end of the conical inlet pipe 48. The conical structure achieves stable flow and speed increase of the tail gas. The tail gas first passes through the filter plate 412. The filter holes on the filter plate 412 intercept and filter large particles of dust and impurities in the tail gas, preventing impurities from entering the collection pipe 41 and causing blockage. The filtered tail gas passes through the small-diameter end of the liquid separator 410 and enters the collection pipe 41. In the collection pipe 41, four sets of spiral condenser plates 43 are kept at low temperature. The exhaust gas flows along the spiral path in the collection pipe 41 and comes into full contact with the condenser plates 43. Water vapor and oil mist in the exhaust gas condense on the surface of the condenser plates 43 upon cooling, forming liquid water droplets and oil droplets. Because the condenser plates 43 are inclined with the collection pipe 41 and the bottom of the drain trough 45 is flush with the inner wall of the collection pipe 41, the condensed water droplets and oil droplets slide down the surface of the condenser plates 43 to the drain trough 45 under the action of gravity. They then collect in the drain trough 45 and onto the inner wall of the collection pipe 41, and then move towards the lower part of the collection pipe 41, finally flowing into the cavity between the liquid separator 410 and the air inlet pipe 48. The drop trough 411, which is connected to the outside, is directly opposite the collection pipe 410. In box 3, droplets fall into collection box 3 under gravity through dropper trough 411, achieving centralized collection of condensed droplets. The exhaust gas, after condensation and dehydration, continues to flow upward along a spiral path in collection pipe 41, eventually entering exhaust pipe 49 from the top of collection pipe 41. As the exhaust gas passes through exhaust pipe 49, it passes through filter block 413. The outer layer of hydrophilic borosilicate glass fiber of filter block 413 adsorbs and aggregates residual tiny water droplets in the exhaust gas, while the inner layer of oleophilic polypropylene fiber adsorbs and aggregates residual tiny oil droplets. This double-layer coalescing structure achieves deep removal of tiny droplets. The oilfield natural gas exhaust gas purified by filter block 413 is discharged from exhaust pipe 49 and can directly enter subsequent pressurization, concentration, and other recovery processes.The entire process achieves continuous and efficient purification and dehydration of exhaust gas, with coolant recycling, resulting in lower energy consumption and suitability for exhaust gas treatment needs in oilfields. Four sets of spiral condenser plates 43 are evenly distributed on the outer surface of the connecting column 44, and the condenser plates 43 penetrate the slots 42 of the collection pipe 41 to form a double-layer contact structure. Combined with the coolant in the sealed cavity flowing through the circulation channel 46 to fully coat the condenser plates 43, the heat exchange efficiency of the condenser plates 43 is significantly improved. Simultaneously, the spiral structure causes the exhaust gas to swirl within the collection pipe 41, extending the contact time between the exhaust gas and the condensation surface, allowing oil mist and water vapor in the exhaust gas to fully condense and precipitate, effectively improving the efficiency and effect of exhaust gas dehydration. Multiple drainage channels are also included. The uniform arrangement of the 45mm filter plates allows droplets to quickly gather and slide off, preventing liquid film formation from affecting heat exchange. Through the graded arrangement of the filter plates 412 and filter blocks 413 in the exhaust gas flow path, impurities in the exhaust gas are removed step by step. The filter plates 412 first intercept large particles of impurities, and the filter blocks 413 then capture tiny droplets through a double-layer coalescing structure. At the same time, the funnel-shaped structure of the liquid separator 410 can effectively prevent droplets in the collection tube 41 from being carried away by the exhaust gas backflow. With the precise alignment of the droplet trough 411 and the collection box 3, the condensed droplets are collected in a directional manner without residue. This not only ensures the purification accuracy of the exhaust gas, but also avoids secondary pollution of the exhaust gas caused by droplet backflow, thus improving the overall processing stability of the device. Compared with related technologies, the oilfield natural gas tail gas recovery device provided by the present invention has the following beneficial effects: Four sets of spiral condenser plates 43 are evenly distributed on the outer surface of the connecting column 44, and the condenser plates 43 penetrate the slot 42 of the collection pipe 41 to form an inner and outer double-layer contact structure. Combined with the coolant in the sealed cavity fully covering the condenser plates 43 through the flow channel 46, the heat exchange efficiency of the condenser plates 43 is significantly improved. At the same time, the spiral structure allows the tail gas to form a swirling flow within the collection pipe 41, extending the contact time between the tail gas and the condensation surface, allowing the oil mist and water vapor in the tail gas to fully condense and precipitate, effectively improving the efficiency and effect of tail gas deliquescence. Furthermore, the even distribution of multiple sets of drainage channels 45... The system allows droplets to quickly collect and slide off, preventing liquid film formation from affecting heat exchange. Through the tiered arrangement of filter plates 412 and filter blocks 413 along the exhaust gas flow path, impurities in the exhaust gas are removed step by step. Filter plates 412 first intercept large particles, while filter blocks 413 capture tiny droplets through a double-layer coalescing structure. Simultaneously, the funnel-shaped structure of the liquid separator 410 effectively prevents droplets in the collection tube 41 from being carried away by the exhaust gas backflow. Combined with the precise alignment of the droplet trough 411 and the collection box 3, condensed droplets are collected directionally without residue. This ensures the purification accuracy of the exhaust gas while preventing secondary pollution from droplet backflow, thus improving the overall processing stability of the device. The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. This invention provides an oilfield natural gas tail gas recovery device. The oilfield natural gas tail gas recovery device includes: The base is a right-angled trapezoid with its sloping side facing downwards. A support frame is fixedly connected to the top of the base, and a cooling component is fixedly connected to the top of the support frame. A condenser is mounted on the cooling component. The oilfield natural gas tail gas recovery device provided by this invention uses four sets of spiral condenser plates evenly distributed on the outer surface of the connecting column. The condenser plates penetrate the slots of the collection pipe, forming a double-layer contact structure. Combined with the coolant in the sealed cavity flowing through the circulation channel to fully coat the condenser plates, the heat exchange efficiency of the condenser plates is significantly improved. Simultaneously, the spiral structure causes the tail gas to form a swirling flow within the collection pipe, extending the contact time between the tail gas and the condenser surface, allowing the oil mist and water vapor in the tail gas to fully condense and precipitate, effectively improving the efficiency and effect of tail gas deliquescence. Furthermore, the evenly arranged multiple sets of drainage channels allow droplets to quickly collect and slide off, preventing the formation of a liquid film from affecting heat exchange.

2. This invention provides an oilfield natural gas tail gas recovery device. The oilfield natural gas tail gas recovery device includes: The base is a right-angled trapezoid with its sloping side facing downwards. A support frame is fixedly connected to the top of the base, and a cooling component is fixedly connected to the top of the support frame. A condenser is mounted on the cooling component. The oilfield natural gas tail gas recovery device provided by this invention uses four sets of spiral condenser plates evenly distributed on the outer surface of the connecting column. The condenser plates penetrate the slots of the collection pipe, forming a double-layer contact structure. Combined with the coolant in the sealed cavity flowing through the circulation channel to fully coat the condenser plates, the heat exchange efficiency of the condenser plates is significantly improved. Simultaneously, the spiral structure causes the tail gas to form a swirling flow within the collection pipe, extending the contact time between the tail gas and the condenser surface, allowing the oil mist and water vapor in the tail gas to fully condense and precipitate, effectively improving the efficiency and effect of tail gas deliquescence. Furthermore, the evenly arranged multiple sets of drainage channels allow droplets to quickly collect and slide off, preventing the formation of a liquid film from affecting heat exchange.

3. The oilfield natural gas tail gas recovery device according to claim 2, characterized in that, The two sets of closed rings (47) are respectively fixedly connected to an air intake pipe (48) and an exhaust pipe (49) at their side ends. The air intake pipe (48) is connected to a set of closed rings (47) located at a lower position, and the exhaust pipe (49) is connected to a set of closed rings (47) located at a higher position. The air intake pipe (48) is conical, and the large-diameter end of the air intake pipe (48) is fixedly connected to the closed ring (47).

4. The oilfield natural gas tail gas recovery device according to claim 3, characterized in that, The intake pipe (48) is fixedly connected to a filter plate (412) for filtering large particulate impurities in the exhaust gas. Multiple sets of filter holes are uniformly opened on the filter plate (412). The exhaust pipe (49) is fixedly connected to a filter block (413) for filtering out residual tiny oil mist droplets and water mist droplets in the exhaust gas. The inner layer of the filter block (413) is made of oleophilic polypropylene fiber material for removing oil mist, and the outer layer is made of hydrophilic borosilicate glass fiber material for removing water mist, forming a double-layer coalescing structure to simultaneously capture tiny oil and water mist droplets.

5. The oilfield natural gas tail gas recovery device according to claim 4, characterized in that, The filter plate (412) is fixedly connected to a funnel-shaped liquid separator (410) on the side facing the collection pipe (41). The liquid separator (410) has an L-shaped cross-section on one side. The small diameter end of the funnel-shaped liquid separator (410) faces the collection pipe (41), and the diameter of the small diameter end of the liquid separator (410) is smaller than the inner side of the closed ring (47). The bottom end of the air inlet pipe (48) is provided with a drop trough (411). The drop trough (411) is located below the liquid separator (410) and directly above the collection box (3). The water droplets and oil droplets precipitated from the condenser plate (43) move from high to low in the collection pipe (41) through the drain trough (45) until they flow between the liquid separator (410) and the air inlet pipe (48) and fall into the collection box (3) through the drop trough (411).

6. The oilfield natural gas tail gas recovery device according to claim 5, characterized in that, The bottom end of the outer tube (510) is connected to the outlet hopper (51) and the inlet hopper (52), with the outlet hopper (51) located on the lower side of the outer tube (510) and the inlet hopper (52) located on the higher side of the outer tube (510). The bottom end of the inlet hopper (52) is connected to the outlet pipe (54), and the bottom end of the outlet hopper (51) is connected to the inlet pipe (53).

7. The oilfield natural gas tail gas recovery device according to claim 6, characterized in that, The base (1) is fixedly connected to a liquid storage tank (56) at its top, and the liquid storage tank (56) is located directly below the outer tube (510). One end of the liquid inlet pipe (53) is connected to the liquid storage tank (56). The base (1) is fixedly connected to a pump (55). The output end of the pump (55) is connected to the liquid outlet pipe (54), and the input end of the pump (55) is connected to the liquid storage tank (56).

8. The oilfield natural gas tail gas recovery device according to claim 7, characterized in that, A heat-conducting plate (57) is fixedly connected to one end of the liquid storage tank (56). A heat-absorbing plate (58) is fixedly connected to the side of the heat-conducting plate (57) facing the liquid storage tank (56). Multiple sets of heat-absorbing plates (58) are provided and are evenly distributed on one side of the heat-conducting plate (57). A semiconductor cooling component (59) is fixedly connected to the side of the heat-conducting plate (57) away from the liquid storage tank (56). The semiconductor cooling component (59) uses a ceramic substrate as the encapsulation substrate and has N and P type semiconductor thermocouple arms connected in series. Utilizing the Peltier effect, after applying DC current, it is attached to one end of the heat-conducting plate (57) to quickly absorb heat and cool down, while the other end releases heat simultaneously. It is used in conjunction with a cooling fan to dissipate heat. Three sets of semiconductor cooling components (59) are provided and are evenly distributed on one side of the heat-conducting plate (57).

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