Natural gas self-circulation purification device

Abstract

The utility model discloses a natural gas self-circulation purification device which comprises a natural gas self-circulation purification device body, the natural gas self-circulation purification device body comprises a heating chamber, a drying chamber, a purification chamber and a circulation filter, the drying chamber and the purification chamber are communicated and fixed to the right side and the top of the heating chamber respectively, and the circulation filter is communicated and fixed to the top of the drying chamber. And an air inlet pipe is fixedly communicated with the left side of the heating chamber. By arranging a series of structures, large-particle solid residues in natural gas can be filtered and intercepted when the natural gas passes through, the filter screen can be conveniently and automatically subjected to back flushing, cleaning and dredging at regular time, and the solid residues are discharged; the automatic blocking effect can be temporarily formed on the L-shaped pipe and the lower portion through the disc, the phenomenon that a large amount of natural gas is directly scattered outwards is prevented, the stability of cleaning, dredging and deslagging is guaranteed, manual dismounting, mounting and cleaning operation of workers is not needed, the cleaning and dredging efficiency, automation and convenience are improved, the working efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas purification equipment, in particular to a natural gas self-circulation purification device. Background Art

[0002] With the gradual depletion of fossil energy, more and more people are starting to use natural gas instead of traditional coal gas. Natural gas has many advantages such as being clean, environmentally friendly and inexpensive. Untreated natural gas contains a small amount of impurities, which will affect the combustion of natural gas, resulting in incomplete combustion of the gas, low calorific value, and the generation of pollutants that pollute the environment. At the same time, it will cause gas-using equipment to become clogged, causing damage to gas-using equipment or causing unsafe factors. Therefore, before natural gas is put into use, it needs to be filtered to remove impurities in the natural gas.

[0003] In this regard, according to the search report of the new search agency, announcement number CN206545006U discloses a natural gas self-circulation purification device, including a heating chamber, an air inlet pipe is fixedly installed on one side of the heating chamber, a heating copper tube is arranged in the heating chamber, a purification chamber is fixedly connected to the top of the heating chamber, a purifier is fixedly installed in the purification chamber, a honeycomb hole is opened at the bottom of the purifier, and an air guide pipe is fixedly connected to one side of the purification chamber; by arranging a heating copper tube, a drying tube, an exhaust pipe and a recovery pipe, natural gas enters the heating chamber through the air inlet pipe, and after being heated by the heating copper tube, the hot air rises into the purifier, and the natural gas enters the purifier through the honeycomb hole for purification, and then enters the filter through the air guide pipe. After preliminary filtration and impurity removal by the filter, the natural gas enters the drying chamber, absorbs moisture in the natural gas through the drying tube, and is finally discharged through the exhaust pipe, thereby achieving the purpose of circulating and purifying natural gas and preventing impurities in the natural gas from clogging gas-using equipment.

[0004] The above technology discloses a natural gas self-circulating purification device, which sequentially passes through a heating chamber, a purification chamber, a filtering chamber, and a drying chamber to realize the circulation, purification, and filtration of natural gas. However, it still has the following shortcomings during use:

[0005] 1. The filter chamber uses the filter inside it to perform preliminary filtering of solid impurities in natural gas, thereby reducing the content of large particle impurities in natural gas. However, as the filtering progresses, the filter in the filter chamber will be covered and clogged by impurities, affecting the ventilation effect, requiring personnel to disassemble and assemble the filter in the filter chamber for cleaning. This disassembly and cleaning method cannot automatically clean and dredge the filter in the filter chamber, and the cleaning efficiency, automation and convenience are not ideal, resulting in low work efficiency and increased labor costs. Improvements are needed. In view of this, improvements are made on this basis, and this application proposes a natural gas self-circulating purification device to solve the above-mentioned problems. Utility Model Content

[0006] The purpose of the present invention is to provide a natural gas self-circulating purification device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a natural gas self-circulating purification device, comprising a natural gas self-circulating purification device body, the natural gas self-circulating purification device body comprising a heating chamber, a drying chamber and a purification chamber connected and fixed to the right and top of the heating chamber respectively, and a circulation filter connected and fixed to the top of the drying chamber, an air intake pipe connected and fixed to the left side of the heating chamber, an exhaust pipe connected and fixed to the right side of the drying chamber, and a self-cleaning and deslagging primary filtration mechanism installed between the purification chamber and the circulation filter;

[0008] The self-cleaning and slag-discharging type primary filtering mechanism includes a round box connected and fixed on the top of the circulation filter, an L-shaped pipe is fixed between the top of the round box and the right side of the purification chamber, a disc is provided with a sealing sleeve in the round box, a vent hole is provided on the top of the disc vertically connected to the purification chamber and the circulation filter, a filter screen for preliminarily filtering solid impurities is fixedly installed in the vent hole, a rotary drive control component for driving the disc to rotate is fixedly installed on the front side of the round box, a PLC controller electrically connected to the rotary drive control component is fixedly installed on the top of the front side of the round box, and a back-blowing dredging and slag removal component for cleaning the filter screen is embedded and fixed on the left side of the round box. The backblowing dredging and slag cleaning component is electrically connected to the PLC controller, and the right side of the round box is connected and fixed with a guide assembly for impurity discharge; the set filter is used to perform preliminary filtering and intercepting solid impurities when the natural gas passes from top to bottom, and the rotary drive control component is used to be controlled by the PLC controller to drive the disc to rotate a quarter of a turn or rotate and reset, and the disc is used to rotate a quarter of a turn to drive the vent and filter to rotate to the left and right settings. The backblowing dredging and slag cleaning component is used to be controlled by the PLC controller to backblow and dredge the filter when the vent and filter are rotated to the left and right settings, and the guide assembly is used to discharge the solid slag outward during slag cleaning.

[0009] Preferably, the rotary drive control assembly includes a fixed cover fixedly mounted on the front side of the round box, the rear side of the fixed cover is set to an opening, a rotating shaft is fixedly connected to the front center of the front side of the disc, the front side of the rotating shaft extends into the fixed cover, the round box is rotatably sleeved on the rotating shaft, a servo motor with an output shaft fixedly mounted on the front side of the fixed cover and a servo motor with an output shaft fixedly connected to the front end of the rotating shaft is fixedly connected to the right side of the rotating shaft. A squeeze block is fixedly connected to the right side of the rotating shaft, and touch switches are fixedly mounted on the right inner wall and the bottom inner wall of the fixed cover. The squeeze block is located between the two touch switches and cooperates with the two touch switches. The touch switches and the servo motor are both electrically connected to the PLC controller.

[0010] Preferably, the backblowing dredging and slag removal assembly includes a rectangular box embedded and fixed on the left side of the round box, a plurality of blowing holes are opened on the right side of the rectangular box, an air pump electrically connected to the PLC controller is fixedly installed on the top of the rectangular box, and the air outlet of the air pump extends into the rectangular box.

[0011] Preferably, the guide assembly includes a collecting cover fixedly connected to the right side of the round box, an L-shaped conduit is fixedly connected to the right side of the collecting cover, and a connecting hole connected to the collecting cover is opened on the right inner wall of the round box.

[0012] Preferably, the rear side of the round box is set to be open and is fixedly connected to a sealing plate.

[0013] Preferably, a sealing ring is provided on the outer adhesive sleeve of the disc, and the outer side of the sealing ring is in movable contact with the inner side of the round box, and the top and bottom of the sealing ring are both provided with a first through hole connected to the vent hole.

[0014] Preferably, the PLC controller is a timer programmable controller.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The round box, vents and filter screen are set up to filter and intercept large particles of solid residue in the natural gas when it passes through.

[0017] 2. Through the coordination of the set round box, vent, filter, PLC controller, rotary drive control component, back-blowing dredging and cleaning component, and the guide assembly, the PLC controller is used to pre-set the start time of the servo motor and the start and stop time of the air pump, and the two adjacent start rotation directions of the servo motor are opposite. The interval time from the servo motor forward to reverse start and the start to stop of the air pump are both set to fifteen seconds. After the setting is completed, the disc can be driven to rotate at a fixed time to control the filter and the vent to turn horizontally, and automatically back-blowing the filter to clean and dredge and discharge the solid residue, so as to achieve the effect of automatic back-blowing and dredging the filter and discharging the solid residue at a fixed time. In addition, by rotating to the left and right and then dredging and discharging, the disc can temporarily form an automatic blocking effect on the L-shaped pipe and the lower part to prevent the phenomenon of natural gas directly escaping out in large quantities, thereby ensuring the stability of cleaning and dredging, improving the cleaning efficiency, automation and convenience, and using automated cleaning and dredging, there is no need for manual disassembly and cleaning operations, thereby improving work efficiency, achieving a manual self-cleaning effect and reducing labor costs.

[0018] The utility model is provided with a series of structures, which can filter and intercept large particles of solid residue in natural gas when natural gas passes through, and is convenient for automatically backblowing the filter screen to clean and dredge and discharge the solid residue at a regular time. In addition, by rotating to the left and right and then dredging and discharging, the disc can be used to temporarily form an automatic blocking effect on the L-shaped pipe and the lower part, preventing the natural gas from directly dispersing in large quantities outward, ensuring the stability of cleaning, dredging and discharging, and eliminating the need for manual disassembly and cleaning operations by personnel, thereby improving the cleaning efficiency, automation and convenience, improving work efficiency and reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a natural gas self-circulating purification device proposed in the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the left view structure;

[0021] Figure 3 This is a schematic diagram of the main cross-sectional structure of a natural gas self-circulation purification device proposed by the present invention;

[0022] Figure 4 for Figure 3 A part of the structure of the enlarged cross-section diagram;

[0023] Figure 5 for Figure 4 A further cross-sectional structural diagram of .

[0024] In the figure: 1. Heating chamber; 2. Purification chamber; 3. Self-cleaning and slag-discharging primary filtration mechanism; 301. Round box; 302. Disc; 303. Vent; 304. Filter; 305. Fixed cover; 3051. Rotating shaft; 3052. Extrusion block; 3053. Touch switch; 3054. Servo motor; 306. PLC controller; 307. Rectangular box; 3071. Blowing hole; 3072. Air pump; 308. Connecting hole; 3081. Collecting cover; 3082. L-shaped duct; 309. Sealing ring; 4. Drying chamber. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 As shown:

[0027] A natural gas self-circulating purification device includes a natural gas self-circulating purification device body, which includes a heating chamber 1, a drying chamber 4 and a purification chamber 2 respectively connected and fixed on the right side and top of the heating chamber 1, and a circulation filter connected and fixed on the top of the drying chamber 4. The left side of the heating chamber 1 is connected and fixed with an air intake pipe, and the right side of the drying chamber 4 is connected and fixed with an exhaust pipe.

[0028] In this implementation scheme: Regarding this existing subject, this application makes further improvements, please refer to the disclosed technology below for details; in order to solve the technical problems existing in this existing technology, as disclosed in the background technology above, "the filter chamber uses the filter inside it to preliminarily filter the solid impurities in the natural gas, reducing the content of large particle impurities in the natural gas, but as the filtering progresses, the filter in the filter chamber will be covered and blocked by impurities, affecting the ventilation effect, and personnel are required to disassemble and assemble the filter in the filter chamber for cleaning; this disassembly and cleaning method cannot automatically clean and dredge the filter in the filter chamber, and the cleaning efficiency, automation and convenience are not ideal, the work efficiency is low, and the labor cost is increased." In terms of combined use, this problem is obviously a real problem that exists and is relatively difficult to solve. In view of this, in order to solve this technical problem, a self-cleaning and slag-discharging primary filtration mechanism is added to this application document.

[0029] It should be noted that the circulating purification and filtration principle formed by the heating chamber 1, the drying chamber 4 and the purification chamber 2 in conjunction with the self-cleaning and slag-discharging primary filtration mechanism has been disclosed by publication number CN206545006U.

[0030] More specifically:

[0031] like Figure 1-Figure 5 As shown:

[0032] The filter screen 304 of the embodiment of the present invention is a filter screen 306 which is a filter screen 307 which is a filter screen 308 which is a filter screen 309 which is a filter screen 309 which is a filter screen 308 ... A PLC controller 306 electrically connected to the rotary drive control component is fixedly installed on the top of the front side. A back-blowing dredging and slag cleaning component for cleaning the filter 304 is embedded and fixed on the left side of the round box 301. The back-blowing dredging and slag cleaning component is electrically connected to the PLC controller 306. The right side of the round box 301 is connected and fixed with a guide assembly for discharging impurities. The filter 304 is used to perform preliminary filtration and interception of solid impurities when natural gas passes from top to bottom. The rotary drive control component is used to be controlled by the PLC controller 306 to drive the disc 302 to rotate a quarter turn or rotate and reset. The disc 302 is used to rotate a quarter turn to drive the vent 303 and the filter 304 to rotate to the left and right settings. The back-blowing dredging and slag cleaning component is used to be controlled by the PLC controller 306 to back-blow and dredge the filter 304 when the vent 303 and the filter 304 are rotated to the left and right settings. The guide assembly is used to discharge solid slag outward during slag cleaning.

[0033] Specifically, the rotary drive control assembly includes a fixed cover 305 fixedly mounted on the front side of the round box 301, the rear side of the fixed cover 305 is set to an opening, the front center of the disc 302 is fixedly connected to a rotating shaft 3051, the front side of the rotating shaft 3051 extends into the fixed cover 305, the round box 301 is rotatably sleeved on the rotating shaft 3051, wherein a circular through-hole is opened on the front inner wall of the round box 301, a bearing is fixedly sleeved in the circular through-hole, the inner ring of the bearing is fixedly sleeved with the outer side of the rotating shaft 3051, which plays the effect of rotatably mounting the rotating shaft 3051, and the front side of the fixed cover 305 is fixedly mounted with an output shaft and a fixed portion thereof at the front end of the rotating shaft 3051. The servo motor 3054 is connected, and the right side of the rotating shaft 3051 is fixedly connected with an extrusion block 3052. The right inner wall and the bottom inner wall of the fixed cover 305 are fixedly installed with a touch switch 3053. The extrusion block 3052 is located between the two touch switches 3053 and cooperates with the two touch switches 3053. The touch switches 3053 and the servo motor 3054 are electrically connected to the PLC controller 306. The fixed cover 305, the rotating shaft 3051, the servo motor 3054, the extrusion block 3052 and the touch switches 3053 are coordinated and pre-set using the PLC controller 306 according to the on-site cleaning interval requirements. The start time of the servo motor 3054 is controlled, and the two adjacent start rotation directions are opposite, wherein the interval time from forward to reverse start is set to fifteen seconds. When the cleaning time is reached, the PLC controller 306 controls the servo motor 3054 to start in the forward direction, so that it drives the rotating shaft 3051 to rotate in the forward direction. The rotating shaft 3051 drives the extrusion block 3052 to rotate until it is squeezed and contacted with the touch switch 3053 below. The touch switch 3053 below is triggered and transmits a stop motion signal to the PLC controller 306. The touch switch 3053 is used to limit the rotation to a quarter of a turn each time. When the rotating shaft 3051 rotates, it drives the disc 302 rotates a quarter of a turn, and the disc 302 drives the vent 303 and the filter 304 to rotate to the left or right setting. Fifteen seconds later, the PLC controller 306 controls the servo motor 3054 to start in the reverse direction, driving the rotating shaft 3051 and the disc 302 to rotate. When the rotating shaft 3051 drives the extrusion block 3052 to rotate until it is in contact with the touch switch 3053 on the right, the touch switch 3053 on the right is triggered and transmits a stop motion signal to the PLC controller 306. The PLC controller 306 controls the servo motor 3054 to turn off, thereby achieving the effect of timing the disc 302 to rotate a quarter of a turn or to rotate and reset.

[0034] Furthermore, the back-blowing dredging and slag removal component includes a rectangular box 307 embedded and fixed on the left side of the round box 301, wherein the left side of the round box 301 is provided with an embedding hole fixedly connected to the outer side of the rectangular box 307, and the right side of the rectangular box 307 is provided with a plurality of blowing holes 3071. An air pump 3072 electrically connected to the PLC controller 306 is fixedly installed on the top of the rectangular box 307, and the air outlet of the air pump 3072 extends into the rectangular box 307. The PLC controller 306 is a time-programmable controller, which facilitates personnel to control the timing of the opening and closing of the air pump 3072 and the servo motor 3054 through programming. ; The rectangular box 307, the blowing hole 3071 and the air pump 3072 are arranged in coordination. The start and close time of the air pump 3072 is pre-set using the PLC controller 306 according to the on-site cleaning interval requirements, and the start time of the air pump 3072 is the same as the start time of the servo motor 3054. The interval time from the start to the shutdown of the air pump 3072 is fifteen seconds. When the air pump 3072 is started, air is supplied to the rectangular box 307, and the gas is blown out to the right through multiple blowing holes 3071. When the air hole 303 and the filter screen 304 are rotated to the left and right, the filter screen 304 is automatically back-blown and cleared of slag by blowing to the right.

[0035] Furthermore, the drainage assembly includes a collecting hood 3081 fixedly connected to the right side of the round box 301, an L-shaped duct 3082 is fixedly connected to the right side of the collecting hood 3081, and a connecting hole 308 connected to the collecting hood 3081 is opened on the right inner wall of the round box 301; the collecting hood 3081, the L-shaped duct 3082 and the connecting hole 308 are arranged to cooperate with each other, and when backblowing to clear the slag, the solid impurities blown to the right are automatically discharged outward through the connecting hole 308, the collecting hood 3081 and the L-shaped duct 3082 in turn, and the L-shaped duct 3082 is connected to the external breathable dust collecting bag to collect the solid slag in a centralized manner, thereby achieving the effect of automatic slag discharge without disassembly.

[0036] The method of use of this embodiment is as follows: the circulating purification and filtration principle formed by the heating chamber 1, drying chamber 4 and purification chamber 2 in conjunction with the self-cleaning and slag-discharging primary filtration mechanism is disclosed in Publication No. CN206545006U and is the prior art. It is similar to the prior art and will not be further elaborated on. The difference is that after the natural gas is purified in the purification chamber 2 and discharged into the round box 301 through the L-shaped pipe, it will pass into the vent 303 and be initially filtered by the filter 304 to intercept solid particulate impurities. The filtered natural gas then flows downward through the circulating filter to the drying chamber 4, where the filter 304 is used to filter and intercept large particulate impurities.

[0037] The PLC controller 306 is used to preset the start time of the servo motor 3054 and the start and stop time of the air pump 3072 according to the on-site cleaning interval requirements, and the two adjacent start rotation directions of the servo motor 3054 are opposite. The interval time from the forward to reverse start of the servo motor 3054 and the start to stop of the air pump 3072 are both set to fifteen seconds. When the cleaning time is reached, the PLC controller 306 controls the servo motor 3054 to start forward and controls the air pump 3072 to start. The servo motor 3054 drives the rotating shaft 3051 to rotate forward. The rotating shaft 3051 drives the squeezing block 3052 to rotate until it is squeezed and in contact with the touch switch 3053 below. The touch switch 3053 below is triggered and transmits a stop motion signal to the PLC controller 306. The touch switch 3053 limits the rotation to a quarter of a turn at a time. When the rotating shaft 3051 rotates, the disc 302 is driven to rotate a quarter of a turn. The disc 302 drives the vent 303 and the filter 304 to rotate to the left and right settings. When the air pump 3072 is started, air is supplied to the rectangular box 307, and the gas is blown out to the right through the multiple blowing holes 3071. When the vent 303 and the filter 304 are rotated to the left and right directions, the filter 304 is automatically back-blown to clear the slag by blowing to the right. During the back-blowing and clearing of the slag, the solid impurities blown to the right are automatically discharged outward through the connecting hole 308, the collecting cover 3081 and the L-shaped duct 3082 in sequence. The L-shaped duct 3082 is connected to an external breathable dust collecting bag to collect the solid slag in a centralized manner, thereby achieving the effect of automatic slag discharge without disassembly.

[0038] Fifteen seconds later, the PLC controller 306 controls the servo motor 3054 to start in reverse and controls the air pump 3072 to shut down. The servo motor 3054 drives the rotating shaft 3051 and the disc 302 to rotate. The rotating shaft 3051 drives the extrusion block 3052 to rotate until it contacts the right touch switch 3053. The right touch switch 3053 is triggered and transmits a stop motion signal to the PLC controller 306. The PLC controller 306 controls the servo motor 3054 to shut down, achieving the effect of timing the disc 302 to rotate a quarter turn or to reset. The disc 302 drives the vent 303 And the filter screen 304 rotates and resets, and the ventilation and filtering work is carried out again, so as to realize the effect of automatic backblowing, cleaning and dredging of the filter screen 304 and discharging the solid slag at a regular time, and by rotating to the left and right and then dredging and discharging, the disc 302 can temporarily form an automatic sealing effect on the L-shaped tube and the lower part, so as to prevent the phenomenon of natural gas directly escaping out in large quantities, ensure the stability of cleaning, dredging and slag discharge, improve the efficiency, automation and convenience of cleaning, and utilize automatic cleaning, dredging and slag discharge, without the need for manual disassembly and cleaning operations, thereby improving work efficiency, achieving a manual self-cleaning effect and reducing labor costs.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A natural gas self-circulating purification device, comprising a natural gas self-circulating purification device body, the natural gas self-circulating purification device body comprising a heating chamber (1), a drying chamber (4) and a purification chamber (2) connected and fixed to the right side and top of the heating chamber (1), respectively, and a circulation filter connected and fixed to the top of the drying chamber (4), the left side of the heating chamber (1) being connected and fixed with an air intake pipe, and the right side of the drying chamber (4) being connected and fixed with an exhaust pipe, characterized in that: A self-cleaning and slag-discharging type primary filtering mechanism (3) is installed between the purification chamber (2) and the circulation filter; The self-cleaning and slag-discharging type primary filtering mechanism (3) comprises a circular box (301) connected and fixed to the top of the circulation filter, an L-shaped pipe is fixed between the top of the circular box (301) and the right side of the purification chamber (2), a circular disc (302) is provided in a sealing sleeve inside the circular box (301), a vent hole (303) vertically connected to the purification chamber (2) and the circulation filter is opened on the top of the circular disc (302), a filter screen (304) for preliminarily filtering solid impurities is fixedly installed in the vent hole (303), and the circular disc (302) is provided with a filter screen (304) for preliminarily filtering solid impurities. A rotary drive control assembly for driving the disc (302) to rotate is fixedly mounted on the front side of the box (301), a PLC controller (306) electrically connected to the rotary drive control assembly is fixedly mounted on the top of the front side of the circular box (301), a back-blowing, dredging and slag-removing assembly for cleaning the filter (304) is embedded and fixed on the left side of the circular box (301), the back-blowing, dredging and slag-removing assembly is electrically connected to the PLC controller (306), and a guide assembly for discharging impurities is connected and fixed on the right side of the circular box (301).

2. A natural gas self-circulating purification device according to claim 1, characterized in that: The rotary drive control assembly comprises a fixed cover (305) fixedly mounted on the front side of the round box (301); the rear side of the fixed cover (305) is set as an opening; a rotating shaft (3051) is fixedly connected to the center of the front side of the disc (302); the front side of the rotating shaft (3051) extends into the fixed cover (305); the round box (301) is rotatably sleeved on the rotating shaft (3051); the front side of the fixed cover (305) is fixedly mounted with an output shaft and a front end of the rotating shaft (3051). A servo motor (3054) is fixedly connected to the right side of the rotating shaft (3051), an extrusion block (3052) is fixedly connected to the right side inner wall and the bottom inner wall of the fixed cover (305), and a touch switch (3053) is fixedly installed on the right side inner wall and the bottom inner wall of the fixed cover (305). The extrusion block (3052) is located between the two touch switches (3053) and cooperates with the two touch switches (3053). The touch switches (3053) and the servo motor (3054) are both electrically connected to the PLC controller (306).

3. The natural gas self-circulation purification device according to claim 1, characterized in that: The back-blowing dredging and slag removal assembly comprises a rectangular box (307) embedded and fixed on the left side of the round box (301), a plurality of air blowing holes (3071) are opened on the right side of the rectangular box (307), an air pump (3072) electrically connected to the PLC controller (306) is fixedly installed on the top of the rectangular box (307), and the air outlet of the air pump (3072) extends into the rectangular box (307).

4. A natural gas self-circulating purification device according to claim 1, characterized in that: The guide assembly includes a collecting cover (3081) fixedly connected to the right side of the round box (301); an L-shaped conduit (3082) is fixedly connected to the right side of the collecting cover (3081); and a connecting hole (308) connected to the collecting cover (3081) is provided on the right inner wall of the round box (301).

5. The natural gas self-circulation purification device according to claim 1, characterized in that: The rear side of the round box (301) is set as an opening and is fixedly connected with a sealing plate.

6. The natural gas self-circulation purification device according to claim 1, characterized in that: The outer adhesive sleeve of the disc (302) is provided with a sealing ring (309), and the outer side of the sealing ring (309) is in active contact with the inner side of the round box (301). The top and bottom of the sealing ring (309) are both provided with a first through hole connected to the vent hole (303).

7. The natural gas self-circulation purification device according to claim 1, characterized in that: The PLC controller (306) is a time-programmable controller.

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