Drying device for natural gas liquefaction pretreatment

Abstract

The invention relates to the technical field of natural gas pretreatment, and discloses a drying device for natural gas liquefaction pretreatment, which comprises a treatment box, a sealing door arranged on the front side of the treatment box and used for opening the treatment box for maintenance, a gas inlet pipe communicated with the bottom of one side of the treatment box, and a gas outlet pipe communicated with one side of the treatment box. The gas outlet pipe is located over the gas inlet pipe, and the drying mechanism is arranged in the treatment box and used for drying natural gas. The driving motor drives the first rotating rod to rotate, so that the guide vanes guide natural gas to uniformly enter the hollow fiber membrane, meanwhile, the rotating assembly drives the movable frame to drive the hollow fiber membrane to rotate, the rotating hollow fiber membrane and fluid generate relative speed, radial vortex is formed, the thickness of a boundary layer is reduced, and the water vapor permeation efficiency is improved; the centrifugal force promotes water vapor to be enriched towards the outer side of the membrane, light hydrocarbon and other macromolecules flow towards the inner side, the separation driving force is increased, and the separated water vapor is prevented from being mixed with dry gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas pretreatment, in particular to a drying device for natural gas liquefaction pretreatment. BACKGROUND

[0002] In the utilization of natural gas, it is rarely used directly at home and abroad, but natural gas liquefaction process is generally adopted to obtain liquefied natural gas for convenient storage and transportation. However, before liquefaction, in order to avoid the influence of water in natural gas on the combustion of natural gas, it is necessary to dry the natural gas.

[0003] According to the drying device for natural gas liquefaction pretreatment disclosed in Chinese patent No. "CN222729728U", it relates to the technical field of natural gas drying. The device comprises a drying box, a plurality of supporting legs are arranged at the bottom of the drying box, a first baffle is arranged in the drying box, a second baffle is arranged above the first baffle, a separation mechanism is arranged between the first baffle and the second baffle, an air inlet pipe is arranged on the surface of the drying box outside the separation mechanism, a dedusting mechanism is arranged above the second baffle in the drying box, a cleaning mechanism is arranged on the dedusting mechanism, natural gas is transported into the separation mechanism in the drying box through the air inlet pipe, the separation mechanism can separate dust and a large amount of water from the natural gas, the dedusting mechanism can cool the wet natural gas below the dew point, so that the water in the moisture condenses into water droplets, the water and other impurities dust condense into liquid state, improve the drying efficiency of natural gas, and the cleaning mechanism can scrape off the water on the condensing pipe, improve the recycling efficiency.

[0004] The above-mentioned patent in use, the water and dust scraped off through the inclined surface of the second baffle slide to the air inlet groove, but the separated natural gas also enters the upper part through the air inlet groove, which will contact the scraped water and dust again, thereby affecting the separation effect of natural gas, so a drying device for natural gas liquefaction pretreatment is proposed to solve the above-mentioned problems. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a drying device for natural gas liquefaction pretreatment to solve the above-mentioned problems in the prior art.

[0006] To solve the above-mentioned technical problems, the technical scheme adopted by the present application is as follows: a drying device for natural gas liquefaction pretreatment, comprising a treatment box, comprising: A sealing door is arranged on the front of the treatment box for opening the treatment box for maintenance; An air inlet pipe is communicated and arranged at the bottom of one side of the treatment box; An air outlet pipe is communicated and arranged at one side of the treatment box, and the air outlet pipe is directly above the air inlet pipe; A drying mechanism is arranged in the interior of the treatment box for drying treatment of natural gas; The impurity removal mechanism is arranged on the drying mechanism and used for intercepting and filtering the impurities in the natural gas; The recovery mechanism is arranged on one side of the treatment box and used for recovering the light hydrocarbon in the water-rich permeated gas; The partition plate is arranged in the treatment box; The second molecular sieve is installed on the partition plate and used for secondary drying of the dried natural gas; The drying mechanism comprises: The fixed cylinder is fixed to the inner wall of the treatment box; The movable frame is rotatably connected to one side of the fixed cylinder; The fixed frame is fixed to the inner wall of the treatment box through the support rod, and the other side of the movable frame is rotatably connected to the fixed frame; The exhaust pipe is arranged on the top of the fixed frame in communication; The flow guide assembly is arranged on the fixed frame and used for guiding the natural gas; The separation assembly is arranged in the movable frame and used for drying the natural gas; The rotating assembly is arranged on the movable frame and used for improving the drying effect of the separation assembly.

[0007] Preferably, the flow guide assembly comprises a driving motor, a first rotating rod and flow guide blades, the driving motor is installed on one side of the treatment box, one end of the first rotating rod is fixedly connected to the output end of the driving motor, and the other end of the first rotating rod is rotatably penetrated through the outer wall of the treatment box and the fixed frame, and the flow guide blades are fixedly connected to the outer wall of the first rotating rod.

[0008] Preferably, the separation assembly comprises a mesh frame, a fixed rod, a sleeve, a mesh plate, a hollow fiber membrane and a first connecting pipe, the mesh frame is rotatably sleeved on the first rotating rod, and the two ends of the mesh frame are fixedly connected to the inner walls of the fixed cylinder and the fixed frame through the fixed rod, the outer wall of the sleeve is fixedly connected to the inner wall of the movable frame, the number of the sleeves is two, the two sleeves are arranged on the two sides of the inner wall of the movable frame, the number of the mesh plates is two, the two mesh plates are fixedly connected to the inner walls of the two sleeves, the hollow fiber membrane is arranged between the two mesh plates and is arranged in communication with the mesh holes on the mesh plates, and one end of the first connecting pipe is arranged in communication with one side of the mesh frame, and the other end of the first connecting pipe is fixedly penetrated through the inner walls of the fixed frame and the treatment box.

[0009] Preferably, the rotating assembly comprises a large gear, a second rotating rod, a transmission gear, a pinion and a gear ring, the large gear is fixedly sleeved on the first rotating rod, the second rotating rod is rotatably connected to the inner wall of the treatment box, the transmission gear is fixedly sleeved on the second rotating rod and is in meshing connection with the large gear, the pinion is fixedly sleeved on the second rotating rod, and the gear ring is fixedly sleeved on the movable frame and is in meshing connection with the pinion.

[0010] Preferably, the impurity removal mechanism comprises a mounting frame, a filter screen, a circular ring, a knocking rod, a triangular block, a spring, and a rotating rod, the mounting frame is fixedly connected to the inner wall of the fixed cylinder, the filter screen is fixedly connected to the mounting frame and the inner wall of the fixed cylinder, the circular ring is fixedly connected to the mounting frame, the knocking rod is movably penetrated through the circular ring, the triangular block is fixedly connected to the knocking rod, one end of the spring is fixedly connected to the circular ring, and the other end of the spring is fixedly connected to the triangular block, and the rotating rod is fixedly connected to the outer wall of the first rotating rod.

[0011] Preferably, the impurity removal mechanism further comprises a brush and a discharge pipe, the brush is fixedly connected to the outer wall of the first rotating rod, and the bristles of the brush are in contact with the filter screen, one end of the discharge pipe is in communication with the bottom of the fixed cylinder, and the other end of the discharge pipe is fixedly penetrated through the inner wall of the processing box, and the discharge pipe is provided with a control valve.

[0012] Preferably, the recovery mechanism comprises an adsorption tower, a first molecular sieve, an insulating plate, an intermediate pipe, a heating wire, activated carbon, a second connecting pipe, a first discharge pipe, a mounting plate, a compressor, a vacuum pump, a pressure gauge, and a second discharge pipe, the adsorption tower is arranged on one side of the processing box, and the bottom of the adsorption tower is in communication with the other end of the first connecting pipe, the first molecular sieve is arranged in the interior of the adsorption tower, the insulating plate is fixed to the inner wall of the adsorption tower and is above the first molecular sieve, the intermediate pipe is fixedly penetrated through the insulating plate, the heating wire is arranged at the bottom of the insulating plate, the activated carbon is arranged in the interior of the adsorption tower and is above the insulating plate, one end of the second connecting pipe is in communication with the adsorption tower, and the other end of the second connecting pipe is in communication with the processing box, the first discharge pipe is in communication with the top of the adsorption tower, the mounting plate is fixedly connected to the back of the adsorption tower, the compressor is mounted on the mounting plate and has an output end in communication with the adsorption tower, the vacuum pump is mounted on the mounting plate and has an output end in communication with the adsorption tower, the pressure gauge is mounted on the first discharge pipe, and the second discharge pipe is in communication with the back of the adsorption tower.

[0013] Preferably, the intermediate pipe, the second connecting pipe, the first discharge pipe, and the second discharge pipe are all provided with electromagnetic valves.

[0014] The technical scheme can bring the following beneficial effects: 1. The natural gas liquefaction pretreatment drying device, the driving motor drives the first rotating rod to rotate, the guide vane guides the natural gas to enter the hollow fiber membrane uniformly, the rotating assembly drives the movable frame to drive the hollow fiber membrane to rotate, the rotating hollow fiber membrane generates relative speed with the fluid, forms radial vortex, reduces the boundary layer thickness, improves the water vapor permeation efficiency, the centrifugal force promotes the water vapor to the outside of the membrane, the large molecules such as light hydrocarbon flow to the inside, the separation driving force increases, and the separated water vapor and dry gas are avoided to be mixed.

[0015] 2. The natural gas liquefaction pretreatment drying device, the impurity removal mechanism is integrated in the drying mechanism, dynamic cleaning is realized through the linkage of the rotating rod, the knocking rod and the brush, when the first rotating rod rotates, the rotating rod periodically extrudes the triangular block, drives the knocking rod to vibrate and knock the filter screen, and the brush is synchronously cleaned, so that the impurity shedding efficiency is improved, the impurities are concentrated and discharged through the impurity discharge pipe, the increase of airflow resistance and the decrease of separation efficiency caused by the accumulation of impurities are avoided, and the continuity of natural gas pretreatment is ensured.

[0016] 3. The natural gas liquefaction pretreatment drying device, the water vapor in the natural gas is preliminarily removed through the hollow fiber membrane, and then the second molecular sieve on the partition plate is used for secondary drying, so that the production standard is met.

[0017] 4. The natural gas liquefaction pretreatment drying device, the water-rich permeation gas generated by membrane separation is treated through the recovery mechanism composed of the adsorption tower, the first molecular sieve and the activated carbon, the first molecular sieve removes water in the permeation gas, and the activated carbon adsorbs and recovers light hydrocarbon, so that the light hydrocarbon in the natural gas is recovered, resource waste caused by direct discharge is avoided, the molecular sieve is regenerated through the heating wire, and the activated carbon is desorbed through the vacuum pump, so that the adsorbent is recycled, the operation cost is reduced, and the greenhouse gas emission is reduced.

[0018] 5. The natural gas liquefaction pretreatment drying device, electromagnetic valves are arranged at key nodes such as the intermediate pipe and the discharge pipe, real-time monitoring is realized through cooperation with the pressure gauge, the adsorption and regeneration processes can be automatically switched, manual intervention is reduced, and separation efficiency fluctuation caused by improper operation is avoided. DETAILED DESCRIPTION

[0019] Figure 1 It is a front view of the present application; Figure 2 It is a front sectional view of the present application; Figure 3 It is a structural schematic view of the present application; Figure 4 It is a first schematic view of the inside of the drying mechanism of the present application; Figure 5 It is a second schematic view of the inside of the drying mechanism of the present application; Figure 6It is a partial schematic view of the drying mechanism of the present application. Figure 7 It is a first schematic view of the impurity removing mechanism of the present application. Figure 8 It is a second schematic view of the impurity removing mechanism of the present application. Figure 9 It is a sectional view of the adsorption tower of the present application. Figure 10 It is a back view schematic of the adsorption tower of the present application.

[0020] In the figure: 1, treatment box; 2, sealing door; 3, air inlet pipe; 4, air outlet pipe; 5, drying mechanism; 51, fixed cylinder; 52, movable frame; 53, fixed frame; 54, exhaust pipe; 55, driving motor; 56, first rotating rod; 57, guide vane; 58, mesh frame; 59, fixed rod; 510, sleeve; 511, mesh plate; 512, hollow fiber membrane; 513, large gear; 514, second rotating rod; 515, transmission gear; 516, small gear; 517, gear ring; 518, first connecting pipe; 6, impurity removing mechanism; 61, mounting rack; 62, filter screen; 63, circular ring; 64, knocking rod; 65, triangular block; 66, spring; 67, rotating rod; 68, brush; 69, impurity discharge pipe; 7, recovery mechanism; 71, adsorption tower; 72, first molecular sieve; 73, heat insulation plate; 74, intermediate pipe; 75, heating wire; 76, activated carbon; 77, second connecting pipe; 78, first discharge pipe; 79, mounting plate; 710, compressor; 711, vacuum pump; 712, pressure gauge; 713, second discharge pipe; 8, partition plate; 9, second molecular sieve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "arranging" should be understood broadly, for example, can be fixedly connected, arranged, or can be detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "several" is two or more, unless otherwise explicitly specified and limited.

[0025] Please refer to Figures 1-10The embodiment of the present application is a drying device for natural gas liquefaction pretreatment, which comprises a treatment box 1, including: a sealing door 2 arranged on the front of the treatment box 1, used for opening the treatment box 1 for maintenance, an air inlet pipe 3 arranged on the bottom of one side of the treatment box 1, an air outlet pipe 4 arranged on one side of the treatment box 1, and the air outlet pipe 4 is directly above the air inlet pipe 3, a drying mechanism 5 arranged in the treatment box 1, used for drying treatment of natural gas, a removal mechanism 6 arranged on the drying mechanism 5, used for intercepting and filtering impurities in the natural gas, a recovery mechanism 7 arranged on one side of the treatment box 1, used for recovering light hydrocarbons in water-rich permeate gas, a partition plate 8 arranged in the treatment box 1, and a second molecular sieve 9 installed on the partition plate 8, used for secondary drying of the dried natural gas, wherein the drying mechanism 5 comprises: a fixed cylinder 51 fixed on the inner wall of the treatment box 1, a movable frame 52 rotatably connected to one side of the fixed cylinder 51, a fixed frame 53 fixed on the inner wall of the treatment box 1 through a support rod, and the other side of the movable frame 52 is rotatably connected to the fixed frame 53, an exhaust pipe 54 arranged on the top of the fixed frame 53, a flow guide assembly arranged on the fixed frame 53, used for guiding the natural gas, a separation assembly arranged in the movable frame 52, used for drying the natural gas, a rotating assembly arranged on the movable frame 52, used for improving the drying effect of the separation assembly, the flow guide assembly comprises a driving motor 55, a first rotating rod 56 and a flow guide blade 57, the driving motor 55 is installed on one side of the treatment box 1, one end of the first rotating rod 56 is fixedly connected to the output end of the driving motor 55, and the other end of the first rotating rod 56 is rotatably penetrated through the outer wall of the treatment box 1 and the fixed frame 53, and the flow guide blade 57 is fixedly connected to the outer wall of the first rotating rod 56, the separation assembly comprises a net frame 58, a fixed rod 59, a sleeve 510, a net plate 511, a hollow fiber membrane 512 and a first connecting pipe 518, the net frame 58 is rotatably sleeved on the first rotating rod 56, and the two ends of the net frame 58 are fixedly connected to the inner walls of the fixed cylinder 51 and the fixed frame 53 through the fixed rod 59, the outer wall of the sleeve 510 is fixedly connected to the inner wall of the movable frame 52, the number of the sleeves 510 is two, the two sleeves 510 are arranged on the inner walls of the movable frame 52 on both sides, the number of the net plates 511 is two, the two net plates 511 are fixedly connected to the inner walls of the two sleeves 510, the hollow fiber membrane 512 is arranged between the two net plates 511 and is in communication with the mesh holes on the net plates 511, one end of the first connecting pipe 518 is in communication with one side of the net frame 58, and the other end of the first connecting pipe 518 is fixedly penetrated through the inner walls of the fixed frame 53 and the treatment box 1, and the rotating assembly comprises a large gear 513, a second rotating rod 514, a transmission gear 515, a small gear 516 and a gear ring 517, the large gear 513 is fixedly sleeved on the first rotating rod 56, the second rotating rod 514 is rotatably connected to the inner wall of the treatment box 1, the transmission gear 515 is fixedly sleeved on the second rotating rod 514 and is in meshing connection with the large gear 513, the small gear 516 is fixedly sleeved on the second rotating rod 514, and the gear ring 517 is fixedly sleeved on the second rotating rod 514.The gear ring 517 is fixedly sleeved on the movable frame 52, and the gear ring 517 is in meshing connection with the pinion 516.

[0026] Preferably, the impurity removing mechanism 6 comprises a mounting frame 61, a filter screen 62, a circular ring 63, a knocking rod 64, a triangular block 65, a spring 66, a rotating rod 67, the mounting frame 61 is fixedly connected to the inner wall of the fixed cylinder 51, the filter screen 62 is fixedly connected to the mounting frame 61 and the inner wall of the fixed cylinder 51, the circular ring 63 is fixedly connected to the mounting frame 61, the knocking rod 64 is movably penetrated through the circular ring 63, the triangular block 65 is fixedly connected to the knocking rod 64, one end of the spring 66 is fixedly connected to the circular ring 63, and the other end of the spring 66 is fixedly connected to the triangular block 65, the rotating rod 67 is fixedly connected to the outer wall of the first rotating rod 56, the impurity removing mechanism 6 further comprises a brush 68 and a pipe 69, the brush 68 is fixedly connected to the outer wall of the first rotating rod 56, and the bristles of the brush 68 are in contact with the filter screen 62, one end of the pipe 69 is in communication with the bottom of the fixed cylinder 51, and the other end of the pipe 69 is fixedly penetrated through the inner wall of the processing box 1, and the pipe 69 is provided with a control valve.

[0027] Working principle: through the gas inlet pipe 3 into the natural gas injection fixed cylinder 51 inside, through the filter screen 62 on the impurities in the natural gas interception, through the start drive motor 55 drive first rotating rod 56 rotation, first rotating rod 56 rotation will drive rotating rod 67 and brush 68 rotation, rotating rod 67 rotation will contact with the triangular block 65 and extrude the triangular block 65, so that under the action of spring 66 is knocking bar 64 on the filter screen 62 knock, avoid filter screen 62 blockage affect the flow of natural gas, while the brush 68 rotation will be on the filter screen 62 on the impurities cleaning, the impurities will fall off the filter screen 62, impurities will fall into the pipe 69, after the subsequent stop running, open control valve can be discharged, after filtering of natural gas will be in contact with the guide vane 57, first rotating rod 56 rotation will drive guide vane 57 rotation, so that through the guide vane 57 drive natural gas rotation, so that natural gas more evenly into the hollow fiber membrane 512, natural gas into the hollow fiber membrane 512, water vapor molecule size is small, through the hollow fiber membrane 512 form rich water permeate gas, methane and other hydrocarbon molecules size is big, be intercepted form dry gas, at the same time, first rotating rod 56 rotation will drive the gear 513 rotation, so that through the transmission gear 515 drive second rotating rod 514 rotation, second rotating rod 514 rotation will drive the pinion 516 rotation, so that through the gear ring 517 drive movable frame 52 rotation, movable frame 52 rotation will through the sleeve 510 and the screen plate 511 drive hollow fiber membrane 512 rotation, make hollow fiber membrane 512 and fluid between the relative speed, induce fluid to produce radial vortex, break the laminar boundary layer, at the same time, also can use centrifugal force, centrifugal force can make water vapor to the membrane outside, while hydrocarbon molecules tend to inside, form additional separation driving force, so as to improve the separation effect of water vapor, separated water vapor will pass through the screen frame 58 into the first connecting pipe 518, while the dry natural gas will pass through the exhaust pipe 54 into the processing box 1 above, again through the second molecular sieve 9 on the water in the natural gas adsorption, further reduce the water in the natural gas, again from the gas outlet pipe 4, realize the drying of natural gas.

[0028] Please see Figures 1-10In another embodiment of the present application based on the above-mentioned embodiments, preferably, the recovery mechanism 7 comprises an adsorption tower 71, a first molecular sieve 72, an insulation plate 73, an intermediate pipe 74, a heating wire 75, an activated carbon 76, a second connecting pipe 77, a first discharge pipe 78, a mounting plate 79, a compressor 710, a vacuum pump 711, a pressure gauge 712, a second discharge pipe 713, the adsorption tower 71 is arranged at one side of the treatment box 1, and the bottom of the adsorption tower 71 is in communication with the other end of the first connecting pipe 518, the first molecular sieve 72 is arranged inside the adsorption tower 71, the insulation plate 73 is fixed to the inner wall of the adsorption tower 71 and is above the first molecular sieve 72, the intermediate pipe 74 is fixed to penetrate through the insulation plate 73, the heating wire 75 is arranged at the bottom of the insulation plate 73, the activated carbon 76 is arranged inside the adsorption tower 71 and is above the insulation plate 73, one end of the second connecting pipe 77 is in communication with the adsorption tower 71, and the other end of the second connecting pipe 77 is in communication with the treatment box 1, the first discharge pipe 78 is in communication with the top of the adsorption tower 71, the mounting plate 79 is fixedly connected to the back of the adsorption tower 71, the compressor 710 is mounted on the mounting plate 79 and the output end of the compressor 710 is in communication with the adsorption tower 71, the vacuum pump 711 is mounted on the mounting plate 79 and the output end of the vacuum pump 711 is in communication with the adsorption tower 71, the pressure gauge 712 is mounted on the first discharge pipe 78, and the second discharge pipe 713 is in communication with the back of the adsorption tower 71, and the intermediate pipe 74, the second connecting pipe 77, the first discharge pipe 78 and the second discharge pipe 713 are all provided with electromagnetic valves.

[0029] Working principle: The water-rich permeation gas enters the adsorption tower 71 through the first connecting pipe 518, the water vapor in the permeation gas is absorbed by the first molecular sieve 72, the permeation gas after absorption enters the upper part of the insulation plate 73 through the intermediate pipe 74, the light hydrocarbon is absorbed by the activated carbon 76, and the excess gas is discharged from the adsorption tower 71 through the first discharge pipe 78, when it is necessary to recover the water vapor in the first molecular sieve 72 and the light hydrocarbon in the activated carbon 76, the electromagnetic valves on the intermediate pipe 74, the second connecting pipe 77 and the first discharge pipe 78 are closed, the heating wire 75 is started to heat the first molecular sieve 72, the water vapor adsorbed by the first molecular sieve 72 is discharged, the water vapor is discharged through the second discharge pipe 713, the vacuum pump 711 is started to reduce the pressure in the upper part of the insulation plate 73, so as to desorb and recover, then the electromagnetic valve on the second connecting pipe 77 is opened, the recovered light hydrocarbon enters the treatment box 1 through the second connecting pipe 77, and is discharged from the gas outlet pipe 4.

[0030] The application provides a drying device for natural gas liquefaction pretreatment, and there are many methods and approaches to realize the technical scheme, and the above description is only the preferred embodiment of the application, and it should be pointed out that, for ordinary skilled in the art, some improvements and refinements can be made without departing from the principle of the application, and the improvements and refinements should also be regarded as the protection scope of the application. The components not explicitly described in the embodiment can be realized by the prior art.

Claims

1. A drying device for natural gas liquefaction pretreatment, comprising a treatment box, characterized in that: include: A sealed door is provided on the front of the processing box and is used to open the processing box for maintenance; An air inlet pipe is connected and arranged at the bottom of one side of the processing box; An air outlet pipe is connected and arranged on one side of the processing box, and the air outlet pipe is located directly above the air inlet pipe; A drying mechanism is provided inside the processing box and is used for drying the natural gas; The impurity removal mechanism is provided on the drying mechanism and is used to intercept and filter impurities in the natural gas; A recovery mechanism is provided on one side of the processing box and is used to recover light hydrocarbons in the water-rich permeate gas; a partition plate, disposed inside the processing box; A second molecular sieve, mounted on the baffle, is used for secondary drying of the dried natural gas; The drying mechanism includes: A fixed cylinder, fixed on the inner wall of the processing box; A movable frame is rotatably connected to one side of the fixed cylinder; The fixed frame is fixed to the inner wall of the processing box through the support rod, and the fixed frame is rotatably connected to the other side of the movable frame; An exhaust pipe is connected and arranged on the top of the fixed frame; A flow guide assembly is provided on the fixed frame and is used to guide the natural gas; A separation component is provided inside the movable frame and is used to dry the natural gas; The rotating component is arranged on the movable frame and is used to improve the drying effect of the separation component.

2. The drying device for natural gas liquefaction pretreatment according to claim 1, characterized in that: The guide assembly includes a drive motor, a first rotating rod, and a guide blade. The drive motor is installed on one side of the processing box. One end of the first rotating rod is fixedly connected to the output end of the drive motor, and the other end of the first rotating rod rotates through the outer wall of the processing box and the fixed frame. The guide blade is fixedly connected to the outer wall of the first rotating rod.

3. The drying device for natural gas liquefaction pretreatment according to claim 2, characterized in that: The separation component includes a mesh frame, a fixed rod, a sleeve, a mesh plate, a hollow fiber membrane, and a first connecting pipe. The mesh frame is rotatably sleeved on the first rotating rod, and the two ends of the mesh frame are fixedly connected to the fixed cylinder and the inner wall of the fixed frame through the fixed rod. The outer wall of the sleeve is fixedly connected to the inner wall of the movable frame. There are two sleeves, and the two sleeves are respectively arranged on both sides of the inner wall of the movable frame. There are two mesh plates, and the two mesh plates are respectively fixedly connected to the inner walls of the two sleeves. The hollow fiber membrane is arranged between the two mesh plates and is connected to the mesh holes on the mesh plates. One end of the first connecting pipe is connected to one side of the mesh frame, and the other end of the first connecting pipe is fixedly passed through the inner wall of the fixed frame and the processing box.

4. The drying device for natural gas liquefaction pretreatment according to claim 3, characterized in that: The rotating assembly includes a large gear, a second rotating rod, a transmission gear, a small gear, and a ring gear. The large gear is fixedly mounted on the first rotating rod, and the second rotating rod is rotatably connected to the inner wall of the processing box. The transmission gear is fixedly mounted on the second rotating rod and is meshed with the large gear. The small gear is fixedly mounted on the second rotating rod, and the ring gear is fixedly mounted on the movable frame, and the ring gear is meshed with the small gear.

5. The drying device for natural gas liquefaction pretreatment according to claim 4, characterized in that: The impurity removal mechanism includes a mounting frame, a filter screen, a ring, a knocking rod, a triangular block, a spring, and a rotating rod. The mounting frame is fixedly connected to the inner wall of the fixed cylinder, the filter screen is fixedly connected to the mounting frame and is fixedly connected to the inner wall of the fixed cylinder, the ring is fixedly connected to the mounting frame, the knocking rod movably passes through the ring, the triangular block is fixedly connected to the knocking rod, one end of the spring is fixedly connected to the ring, and the other end of the spring is fixedly connected to the triangular block, and the rotating rod is fixedly connected to the outer wall of the first rotating rod.

6. The drying device for natural gas liquefaction pretreatment according to claim 5, characterized in that: The debris removal mechanism also includes a brush and a debris discharge pipe. The brush is fixedly connected to the outer wall of the first rotating rod, and the bristles of the brush are in contact with the filter screen. One end of the debris discharge pipe is connected to the bottom of the fixed cylinder, and the other end of the debris discharge pipe is fixedly passed through the inner wall of the processing box. A control valve is provided on the debris discharge pipe.

7. The drying device for natural gas liquefaction pretreatment according to claim 6, characterized in that: The recovery mechanism includes an adsorption tower, a first molecular sieve, an insulation board, an intermediate pipe, a heating wire, activated carbon, a second connecting pipe, a first discharge pipe, a mounting plate, a compressor, a vacuum pump, a pressure gauge, and a second discharge pipe. The adsorption tower is arranged on one side of the processing box, and the bottom of the adsorption tower is connected to the other end of the first connecting pipe. The first molecular sieve is arranged inside the adsorption tower, the insulation board is fixed on the inner wall of the adsorption tower and the insulation board is above the first molecular sieve, the intermediate pipe is fixed through the insulation board, the heating wire is arranged at the bottom of the insulation board, the activated carbon is arranged inside the adsorption tower and the activated carbon is above the insulation board, one end of the second connecting pipe is connected to the adsorption tower, and the other end of the second connecting pipe is connected to the processing box, the first discharge pipe is connected to the top of the adsorption tower, the mounting plate is fixedly connected to the back of the adsorption tower, the compressor is mounted on the mounting plate, and the output end of the compressor is connected to the adsorption tower, the vacuum pump is mounted on the mounting plate, and the output end of the vacuum pump is connected to the adsorption tower, the pressure gauge is mounted on the first discharge pipe, and the second discharge pipe is connected to the back of the adsorption tower.

8. The drying device for natural gas liquefaction pretreatment according to claim 7, characterized in that: The intermediate pipe, the second connecting pipe, the first discharge pipe and the second discharge pipe are all provided with electromagnetic valves.

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