Vehicle-mounted scattered natural gas purification process system and method

Abstract

The invention discloses a vehicle-mounted scattered natural gas purification process system and method, and belongs to the technical field of natural gas purification process systems.The vehicle-mounted scattered natural gas purification process system comprises a vehicle-mounted tank fixedly installed on a transport vehicle, the vehicle-mounted tank is internally provided with a purification process system, and the purification process system comprises a gas inlet module, a multi-stage filtering mechanism, a discharging mechanism and a discharging module; the vehicle-mounted tank serves as a carrier, the gas inlet module, the multi-stage filtering mechanism, the unloading mechanism, the discharging module and the secondary filtering module are integrated, a complete vehicle-mounted purification system for gas inlet, filtering, discharging and refiltering is constructed, the regional limitation of a traditional fixed purification station is broken through, low-pressure scattered natural gas of an oil field and a gas field can be flexibly connected, and the low-pressure scattered natural gas purification station is suitable for large-scale industrial production. The problem that a dispersed gas source is difficult to process in a centralized mode is solved, meanwhile, preconditions capable of being connected into a pipe network or directly used are provided for low-pressure scattered natural gas which cannot be directly utilized originally, and a foundation for efficient purification is laid.

Description

Technical Field

[0001] This invention belongs to the technical field of natural gas purification process systems, specifically relating to a vehicle-mounted scattered natural gas purification process system and method. Background Technology

[0002] In energy utilization scenarios such as oil and gas field exploration and development, coalbed methane extraction, and industrial by-product natural gas recovery, the efficient recovery and purification of low-pressure, scattered natural gas resources has become a critical issue that the industry urgently needs to address. These gas sources are widely distributed in remote oilfield blocks, small gas wells, coalbed methane wellheads, and by-product stages in industrial production such as chemical and metallurgical processes, exhibiting significant unique characteristics and limitations. Traditional fixed purification stations require large investments and have long construction periods, making them unsuitable for scattered, small-scale gas sources. To address geographical limitations, developing vehicle-mounted purification devices is crucial, but certain technical shortcomings remain. Existing devices are prone to filter clogging during purification, hindering unloading and slag removal operations, and failing to meet the practical needs for efficient purification and flexible utilization of scattered natural gas.

[0003] To avoid the aforementioned technical problems, it is indeed necessary to provide an on-board scattered natural gas purification process system and method to overcome the deficiencies in the prior art. Summary of the Invention

[0004] The purpose of this invention is to provide an on-board scattered natural gas purification process system and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vehicle-mounted, scattered natural gas purification process system, comprising a vehicle-mounted tank fixedly installed on a transport vehicle, wherein a purification process system is installed inside the vehicle-mounted tank, and the purification process system includes: An air intake module is located on the top side of the vehicle-mounted tank and includes an air intake pipe for connecting to low-pressure, sporadic natural gas. The multi-stage filtration mechanism includes a cylindrical body disposed inside a vehicle-mounted tank. Within the cylindrical body, a granular filter media layer, a filter hopper, and a filtration unit are coaxially arranged from top to bottom. The granular filter media layer is used to intercept large particulate impurities, the filter hopper is used to collect impurities, and the filtration unit is used for fine filtration. The filter hopper is located below the granular filter media layer, and the bottom end of the filtration unit is connected to a discharge module. The unloading mechanism is used to discharge filter media and clean impurities. It is installed in the middle of the multi-stage filtration mechanism and includes a liftable and rotatable unloading rod and a sealing plate for opening and closing the bottom of the granular filter media layer. The unloading rod passes through the granular filter media layer and the filter hopper in sequence and extends to the top of the filtration unit. The sealing plate is sleeved on the unloading rod and is adapted to the bottom of the granular filter media layer. The discharge module includes a discharge pipe for conveying the pre-purified gas to the secondary filtration module for further processing. One end of the discharge pipe is connected to the bottom of the cylinder, and the other end is connected to the secondary filtration module. The filter unit contains a filter element structure that allows gas to pass through but intercepts impurities.

[0006] In a preferred embodiment, a frustum is provided inside the cylinder, and a pusher rod adapted to the contour of the frustum is fixedly connected to the outer wall of the unloading rod. Micropores for gas filtration are opened on the surface of the frustum. A particle storage cavity is formed between the frustum and the inner wall of the cylinder. A discharge pipe communicating with the filter cavity is opened on one side of the outer wall of the cylinder for discharging the particle filter material.

[0007] In a preferred embodiment, the unloading mechanism further includes a filter cover, a first suction pipe, and a second suction pipe. The filter cover is disposed inside the filter hopper to seal the bottom of the filter hopper. One end of the first suction pipe penetrates the cylinder and is connected to a vacuum cleaner, while the other end of the first suction pipe is connected to the bottom of the filter hopper to remove and discharge residual impurities inside the filter hopper. One end of the second suction pipe penetrates the outer wall of the cylinder on the side corresponding to the filter unit, while the other end of the second suction pipe is connected to a vacuum cleaner to perform negative pressure adsorption treatment on impurities that are swept back on the surface of the filter unit.

[0008] In a preferred embodiment, the unloading rod has vertically spaced through holes on its outer wall inside the filter cover, allowing the raw material gas to pass through the filter cover and flow into the filter unit inside the cylinder via the through holes of the unloading rod.

[0009] As a preferred embodiment, the filter unit is provided with a waste cleaning mechanism, which is arranged longitudinally along the central axis of the filter unit. The waste cleaning mechanism includes an air supply pipe, which passes through the top center of the filter unit and is connected to the unloading rod. The bottom end of the air supply pipe passes through the bottom of the vehicle tank and is connected to an external air source through a rotary joint.

[0010] As a preferred embodiment, multiple radially evenly distributed connecting pipes are fixedly connected to the outer wall of the gas supply pipe, and nozzles are installed at the ends of the connecting pipes, so that the waste removal mechanism can form a three-dimensional purging structure within the filter unit.

[0011] In a preferred embodiment, the vehicle-mounted tank is provided with a drive mechanism, which includes a hydraulic push rod and a transmission mechanism. The hydraulic push rod is used to push the output pipe and the unloading rod to move in the vertical direction, and the transmission mechanism is used to drive the output pipe to rotate in the horizontal direction.

[0012] In a preferred embodiment, the bottom end of the filtration unit is connected to the discharge pipe for further filtration by the filtration unit and the secondary filtration module. The secondary filtration module includes multiple continuously connected processing tanks. Each processing tank is equipped with a fine filter element and a dryer in sequence according to the gas flow direction. The end of the processing tank is connected to the storage cavity inside the vehicle-mounted tank.

[0013] In a preferred embodiment, a processing cavity is formed on the surface of the vehicle-mounted tank, the secondary filtration module is placed inside the processing cavity, and an arc-shaped push-pull plate for closing the processing cavity is horizontally slidably connected to the surface of the vehicle-mounted tank at the opening of the processing cavity.

[0014] A method for a vehicle-mounted, distributed natural gas purification system includes the following steps: Step 1: Raw material gas access and pressure stabilization. Low-pressure, scattered natural gas from oil fields and gas fields is connected to the vehicle-mounted tank through the intake pipe of the intake module, and the pressure is stabilized by the pressure regulating valve on the intake pipe.

[0015] Step 2: The raw gas enters the cylinder from top to bottom in a multi-stage gradient filtration process. After passing through the granular filter material layer, dust and mechanical impurities are intercepted. Then, the gas passes through the micropores on the surface of the truncated cone and enters the filter chamber and filter cover. Finally, the gas enters the filter unit and passes through the filter element structure to remove fine impurities and liquid water, completing the initial purification. Step 3, waste treatment: The external air source delivers high-pressure gas to the air supply pipe through a rotary joint, and then distributes it to each high-pressure atomizing nozzle through the connecting pipe. Simultaneously, the drive mechanism starts, and the hydraulic push rod drives the vertical lifting transmission mechanism of the air supply pipe and the unloading rod to drive the air supply pipe to rotate horizontally, removing the attached impurities in the gaps of the filter element pleats, and then being sucked out and discharged by the high-pressure negative pressure vacuum cleaner through the first and second suction pipes. Step 4, unloading process: Start the unloading mechanism. The drive mechanism drives the unloading rod upward through the hydraulic push rod, so that the sealing plate closes the bottom of the granular filter media layer. The drive mechanism drives the unloading rod to rotate, and pushes the filter media in the granular filter media layer to the discharge pipe through the push rod, so as to realize the discharge of granular filter media. Step 5: After multi-stage filtration, the natural gas enters the secondary filtration module through the discharge pipe and flows sequentially along the continuous processing tank. Step Six: Storage and Output. The purified gas, after secondary filtration and deep dehydration, is transported through pipelines to the storage chamber inside the vehicle-mounted tank. Compared with the prior art, the beneficial effects of the present invention are: This invention integrates an air intake module, a multi-stage filtration mechanism, a unloading mechanism, a discharge module, and a secondary filtration module into a vehicle-mounted tank, constructing a complete vehicle-mounted purification system encompassing air intake, filtration, discharge, and re-filtration. Compared to traditional fixed purification stations, this system overcomes the shortcomings of high investment, long construction periods, and strong geographical limitations. It allows for flexible deployment to remote gas source sites such as oil fields and gas fields, solving the industry pain point of centralized processing of dispersed gas sources. Furthermore, it provides the necessary conditions for connecting to pipelines or directly using low-pressure, scattered natural gas that was previously unusable, laying the foundation for efficient purification.

[0016] This invention, by setting a frustum in the cylinder to form a gradient filtration path with the granular filter media layer, filter bucket, and filtration unit, combined with the secondary interception of the filter hood, achieves multi-particle size coverage and removal from large particles to fine dust and liquid water, compared to existing single-stage filtration vehicle purification devices. The initial purification impurity removal rate is significantly improved. At the same time, the coordinated design of the unloading rod, pushing rod, and suction pipe overcomes the problems of cumbersome unloading and high impurity residue rate of traditional devices. It can directionally push the granular filter media and suck up residual impurities in the filter bucket, resulting in a higher degree of automation in unloading, effectively reducing the impact of impurity residue on the filtration effect, and extending the equipment maintenance cycle.

[0017] This invention features a waste removal mechanism that forms a three-dimensional blowing structure through a gas supply pipe, radially distributed connecting pipes, and nozzles. Combined with the lifting of a hydraulic push rod and the rotation of a transmission mechanism, this device, compared to existing purification devices lacking efficient waste removal mechanisms, can remove adhering impurities from the gaps in the filter element's pleats. Simultaneous adsorption via a suction pipe ensures more thorough waste removal, avoiding frequent clogging of the filter element. Compared to traditional manual waste removal or simple reverse blowing, it significantly extends the filter element's lifespan and automates the waste removal, unloading, and filtration process. Compared to existing devices with their high manual intervention and low operating efficiency, this significantly improves convenience and stability in mobile operation scenarios, making it suitable for the recycling and utilization of scattered natural gas.

[0018] This invention, through the synergistic effect of the fine filter element and dryer in the secondary filtration module, can deeply intercept tiny particles and fine liquid mists, achieving deep dehydration of natural gas, compared to existing vehicle-mounted devices lacking a deep processing stage. This ensures that the dew point and purity of the purified natural gas meet the standards for pipeline connection or direct use. Furthermore, the secondary filtration module adopts a modular design and is placed within a sealable processing chamber. Compared to traditional devices with dispersed component layouts and inconvenient maintenance, this facilitates later inspection and component replacement, further improving the practicality and operational efficiency of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the vehicle-mounted purification system of the present invention. Figure 1 ; Figure 2This is a schematic diagram of the overall structure of the vehicle-mounted purification system of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of the vehicle-mounted tank of the present invention; Figure 4 This is a schematic diagram of the internal structure of the cylinder of the present invention; Figure 5 This is a schematic diagram of the multi-stage filtration mechanism of the present invention; Figure 6 For the present invention Figure 5 A magnified structural diagram at point A; Figure 7 This is a schematic diagram of the unloading mechanism of the present invention.

[0020] In the diagram: 1. Vehicle-mounted tank; 2. Air inlet pipe; 3. Cylinder; 4. Filter hopper; 5. Filter unit; 6. Unloading rod; 7. Sealing plate; 8. Discharge pipe; 9. Frustum; 10. Push rod; 11. Discharge pipe; 12. Filter cover; 13. Dust suction pipe one; 14. Dust suction pipe two; 15. Air supply pipe; 16. Connecting pipe; 17. Nozzle; 18. Hydraulic push rod; 19. Processing tank; 20. Processing chamber; 21. Arc-shaped push-pull plate. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments.

[0022] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0023] Please see Figure 1-7 This invention provides a vehicle-mounted, scattered natural gas purification process system and method, including a vehicle-mounted tank 1, which is fixedly installed on a transport vehicle. A purification process system is installed inside the vehicle-mounted tank 1, and the purification process system includes: An air intake module is located on the top of one side of the vehicle tank 1, including an air intake pipe 2 for connecting low-pressure sporadic natural gas. The air intake pipe 2 is connected to a pressure regulating valve to stabilize the pressure of the raw material gas intake. The multi-stage filtration mechanism includes a cylinder 3 installed inside the vehicle-mounted tank 1. The cylinder 3 is equipped with a stepped filtration assembly arranged coaxially from top to bottom, which includes a granular filter media layer, a filter hopper 4, and a filter unit 5. The granular filter media layer is used to intercept dust and mechanical impurities with a diameter ≥10μm in the raw gas. The filter unit 5 can be a PTFE pleated filter element, which is used to initially intercept dust and liquid water droplets, and plays a role in primary filtration protection. The discharge module includes a discharge pipe 8, one end of which is connected to the bottom of the cylinder 3, and the other end of which is connected to the secondary filtration module. It can flexibly connect to low-pressure scattered natural gas from oil fields and gas fields, solving the problem of centralized processing of dispersed gas sources. The pressure regulating valve in the intake pipeline stabilizes the input of low-pressure raw gas. Combined with the initial interception of the multi-stage filtration mechanism and the deep processing of the secondary filtration module, it provides the preconditions for the low-pressure scattered natural gas that could not be directly used before to be connected to the pipeline network or used directly, laying the foundation for efficient purification.

[0024] like Figure 3 and Figure 5 As shown, a frustum 9 is provided inside the cylinder 3. A pusher rod 10 adapted to the contour of the frustum 9 is fixedly connected to the outer wall of the unloading rod 6. Micropores for gas filtration are opened on the surface of the frustum 9. The frustum 9 and the inner wall of the cylinder 3 form a particle storage cavity. A discharge pipe 11 communicating with the filtration cavity is opened on one side of the outer wall of the cylinder 3 for discharging the particle filter material. A valve is provided on the discharge pipe 11. After the discharge pipe 11 is opened, the pusher rod 10 stirs the particle filter material with the unloading rod 6 and discharges the particle filter material. A sealing cover is provided on the top of the cylinder 3. The particle filter material can be replaced by opening the sealing cover. The unloading mechanism also includes a filter cover 12, a first suction pipe 13 and a second suction pipe 14. The filter cover 12 is installed inside the filter hopper 4 to seal the bottom of the filter hopper 4. One end of the first suction pipe 13 passes through the cylinder 3 and is connected to the vacuum cleaner. The other end of the first suction pipe 13 is connected to the bottom of the filter hopper 4 to remove and discharge residual impurities in the filter hopper 4. When the filter hopper 4 moves vertically, the filter cover 12 of the filter hopper 4 separates from the bottom of the filter hopper 4, making it easier for the vacuum cleaner to remove and discharge residual impurities in the filter hopper 4. The unloading rod 6 has vertically spaced through holes on its outer wall inside the filter cover 12, which are used for the raw material gas to pass through the filter cover 12 and flow through the through holes of the unloading rod 6 to the filter unit 5 inside the cylinder 3. The raw material gas is filtered again by setting a filter cover 12, and then enters the unloading rod 6 through the through hole, and flows again through the through hole to the cylinder 3 where the filter unit 5 is located. The gas is filtered again by the filter unit 5. The addition of the filter cover further seals the bottom of the filter bucket. With the help of the dust suction pipe, the residual impurities in the filter bucket are removed, reducing the impact of residual impurities on the filtration effect and solving the problems of cumbersome unloading and residual impurities in traditional devices.

[0025] The filter hopper 4 is located below the granular filter media layer and is used to collect large particulate impurities intercepted by the granular filter media layer; The filter unit 5 is equipped with a waste cleaning mechanism, which is arranged longitudinally along the central axis of the filter unit 5. The waste cleaning mechanism includes an air supply pipe 15, which passes through the top center of the filter unit 5 and is connected to the unloading rod 6. The bottom end of the air supply pipe 15 passes through the bottom of the vehicle tank 1 and is connected to an external air source through a rotary joint.

[0026] Inside the filter unit 5, multiple radially evenly distributed connecting pipes 16 are fixedly connected to the outer wall of the air supply pipe 15. A nozzle 17 is installed at the end of the connecting pipe 16, so that the waste cleaning mechanism forms a three-dimensional blowing structure inside the filter unit 5. Gas is supplied to the gas supply pipe 15, the connecting pipe 16 and the nozzle 17 through the external gas supply end, and the filter unit 5 is reverse-swept by high-pressure gas. One end of the suction pipe 14 penetrates the outer wall of the cylinder 3, corresponding to one side of the filter unit 5, and the other end of the suction pipe 14 is connected to the vacuum cleaner for negative pressure adsorption of impurities swept back on the surface of the filter unit 5. The second suction pipe 14 can be connected to the vacuum cleaner of the first suction pipe 13 through the vehicle tank 1 via a three-way valve, or a separate vacuum cleaner can be installed for connection. The vehicle-mounted tank 1 is equipped with a drive mechanism, which includes a hydraulic push rod 18 and a transmission mechanism. The hydraulic push rod 18 is used to push the output pipe and the unloading rod 6 to move in the vertical direction, and the transmission mechanism is used to drive the output pipe to rotate in the horizontal direction. The specific transmission mechanism can be a bevel gear sleeved on the outer wall of the gas supply pipe 15, and a spline sleeve is sleeved on the outer wall of the gas supply pipe 15 so that it can move in the vertical direction while maintaining rotation in the horizontal direction. The connection with the external gas source can be a hose connection to prevent interference between vertical movement and horizontal rotation. The hydraulic push rod 18 is fixedly connected to a connecting frame at its telescopic end. The outer wall of the output pipe of the connecting frame is fixedly connected to the connecting frame. A limit rod is provided on the connecting frame to ensure stable vertical movement. When the hydraulic push rod 18 pushes the connecting frame to move vertically upward, it can ensure that the air supply pipe 15 moves within the filter unit 5. At the same time, it pushes the unloading rod 6 to move, which can separate the filter cover 12 from the filter hopper 4 for easy unloading. The sealing plate 7, which is fixedly connected to the unloading rod 6, fits and adheres to the bottom of the granular filter material layer. When the unloading rod 6 rotates, the stirring rod, which is fixedly connected to the unloading rod 6, pushes the granules to move. After the discharge pipe 11 is opened, the push rod 10, along with the unloading rod 6, stirs the granular filter material and discharges the granular filter material. The bottom of the filter unit 5 is connected to the discharge pipe for further filtration between the filter unit 5 and the secondary filtration module. The secondary filtration module includes multiple continuous processing tanks 19. Each processing tank 19 is equipped with a fine filter element and a dryer in sequence according to the gas flow direction. The end of the processing tank 19 is connected to the storage cavity inside the vehicle tank body 1. The outer surface of the filter element is covered with filter cloth to intercept fine impurities and liquid water with a diameter ≤10μm. Each processing tank 19 is arranged in sequence along the length of the vehicle tank body 1, and adjacent processing tanks 19 are detachably connected by a sealed pipe to realize continuous gas flow and component replacement. The surface of the vehicle-mounted tank 1 is provided with a processing chamber 20 for placing a secondary filtration module. An arc-shaped push-pull plate 21 is horizontally slidably connected to the surface of the vehicle-mounted tank 1 near the processing chamber 20 to facilitate the sealing of the processing chamber 20.

[0027] A method for a vehicle-mounted, discrete natural gas purification process system specifically includes the following steps: Step 1: Raw material gas access and pressure stabilization. Low-pressure, scattered natural gas from oil fields and gas fields is connected to the vehicle tank 1 through the intake pipe 2 of the intake module. The intake pressure is stabilized at 0.2-0.3MPa through the pressure regulating valve on the intake pipe 2 to ensure that the raw material gas enters the multi-stage filtration mechanism at a stable flow rate. Step 2: The raw gas enters the cylinder 3 from top to bottom in a multi-stage gradient filtration process. First, it passes through the granular filter media layer, intercepting dust and mechanical impurities with a diameter ≥10μm. Then, the gas passes through the micropores on the surface of the frustum 9 into the filtration chamber. After preliminary separation, the gas passes through the through hole on the discharge rod 6 and through the filter cover 12, entering the area above the filter hopper 4. The filter hopper 4 collects large particulate impurities that fall from the granular filter media layer. Finally, the gas enters the filtration unit 5, where the filter element structure intercepts fine impurities with a diameter ≤10μm and liquid water, completing the preliminary purification. Step 3, Waste Cleaning: When the differential pressure sensor on both sides of the filter element structure in filter unit 5 detects a differential pressure ≥ 0.12 MPa, the waste cleaning mechanism is activated. An external air source delivers high-pressure gas to the air supply pipe 15 through a rotary joint, and distributes it to each high-pressure atomizing nozzle 17 via the connecting pipe 16. Simultaneously, the drive mechanism is activated, and the hydraulic push rod 18 drives the air supply pipe 15 and the unloading rod 6 to rise and fall vertically. The lifting height can be selected from 0-50 cm. The transmission mechanism drives the air supply pipe 15 to rotate horizontally, with a selectable speed of 0-30 r / min, forming a three-dimensional blowing structure to remove adhering impurities in the gaps between the filter element folds. The dust and impurities generated by the blowing are sucked away and discharged by the high-pressure negative pressure vacuum cleaner through the first suction pipe 13 and the second suction pipe 14. The waste cleaning time lasts for 3-5 minutes until the differential pressure returns to ≤ 0.03 MPa.

[0028] Step 4, graded unloading: When the liquid level sensor at the bottom of the filter hopper 4 detects that the impurities have accumulated to a certain height, unloading is initiated. The unloading mechanism is activated, and the drive mechanism moves the unloading rod 6 upward via the hydraulic push rod 18, causing the sealing plate 7 to close the bottom of the granular filter media layer to prevent leakage of the granular filter media during unloading. At the same time, the sealing structure at the bottom of the filter hopper 4 is opened, and the drive mechanism drives the unloading rod 6 to rotate, pushing the filter media in the granular filter media layer towards the discharge pipe 11 via the push rod 10, thus realizing the discharge of the granular filter media. Residual impurities in the filter hopper 4 are removed by the first suction pipe 13, and residual impurities in the filter chamber are removed by the second suction pipe 14. After unloading is completed, the unloading rod 6 moves down to its original position, the sealing plate 7 opens, the sealing structure at the bottom of the filter hopper 4 closes, and the filtration state is restored.

[0029] Step 5: Secondary Fine Filtration and Deep Dehydration. The natural gas, after multi-stage filtration, enters the secondary filtration module through the discharge pipe 8 and flows sequentially along the continuous processing tank 19. It passes through the fine filter element in the pre-processing tank 19, deeply intercepting residual microparticles and fine liquid mist with a diameter ≤0.1μm. Then, it enters the dryer in the post-processing tank 19, where it undergoes deep dehydration through molecular sieve adsorbent. In specific implementation, a dew point sensor can be set. When the dew point sensor detects that the natural gas dew point is ≥-60℃, the PLC controller issues a warning signal, prompting the replacement of the molecular sieve adsorbent.

[0030] Step Six: Storage and Output. The purified gas, after secondary filtration and deep dehydration, is transported through pipelines to the storage chamber inside the vehicle-mounted tank 1. When external gas supply is required, the output pressure is adjusted to the appropriate value through the pressure regulating valve at the outlet of the storage chamber, and gas is supplied to the gas-using equipment through the output pipeline, or the transport tanker is filled through the gas filling column. In practice, a PLC controller can be used to monitor parameters such as pressure, differential pressure, and dew point at each node in real time throughout the process to ensure stable system operation.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted scattered natural gas purification process system, comprising a vehicle-mounted tank (1) fixedly installed on a transport vehicle, characterized in that, The vehicle-mounted tank body (1) is provided with a purification process system, which comprises: An air inlet module is arranged on one side of the top of the vehicle-mounted tank body (1) and comprises an air inlet pipeline (2) for connecting to low-pressure scattered natural gas; A multi-stage filtering mechanism comprises a cylinder (3) arranged inside the vehicle-mounted tank body (1), wherein the cylinder (3) is sequentially provided from top to bottom with a particle filter layer for intercepting large-particle impurities, a filter hopper (4) for collecting impurities, and a filtering unit (5) for fine filtering; A discharging mechanism penetrates through the particle filter layer and the filter hopper (4) and comprises a discharging rod (6) capable of being lifted and rotated and a sealing piece (7) for opening and closing the bottom of the particle filter layer, so as to realize the discharge of filter material and the cleaning of impurities; A discharging module comprises a discharging pipeline (8) for conveying the gas purified initially to a secondary filtering module for deep processing; The filtering unit (5) is formed with a filter core structure that allows the gas to pass through but intercepts impurities.

2. A system for purifying scattered natural gas on a vehicle according to claim 1, characterized in that: The cylinder (3) is provided with a circular table (9), the outer wall of the discharging rod (6) is fixedly connected with a pushing rod (10) matched with the outline of the circular table (9), the surface of the circular table (9) is provided with micropores for gas filtering, and a particle storage cavity is formed between the circular table (9) and the inner wall of the cylinder (3). A discharging pipe (11) is arranged on one side of the outer wall of the cylinder (3) and is in communication with the filtering cavity, so as to discharge the particle filter material.

3. A system for purifying stranded natural gas on board a vehicle as defined in claim 1, wherein: The discharging mechanism further comprises a filter cover (12), a dust suction pipe one (13) and a dust suction pipe two (14). The filter cover (12) is arranged in the filter hopper (4) and is used for closing the bottom of the filter hopper (4). One end of the dust suction pipe one (13) penetrates through the cylinder (3) and is connected with a dust collector. The other end of the dust suction pipe one (13) penetrates through the bottom end of the filter hopper (4) and is used for sucking and discharging the residual impurities in the filter hopper (4). One end of the dust suction pipe two (14) penetrates through the outer wall of the cylinder (3) and is located on one side of the filtering unit (5). The other end of the dust suction pipe two (14) is connected with the dust collector and is used for performing negative pressure adsorption treatment on the impurities that are back-flushed on the surface of the filtering unit (5).

4. A system for purifying stranded natural gas on board a vehicle as claimed in claim 3, characterized in that: The outer wall of the discharging rod (6) located in the filter cover (12) is provided with vertically spaced through holes, so that the raw gas passes through the filter cover (12) and flows to the filtering unit (5) in the cylinder (3) through the through holes of the discharging rod (6).

5. A system for purifying stranded natural gas on board a vehicle as defined in claim 1, wherein: The filtering unit (5) is provided with a waste cleaning mechanism, which comprises a gas conveying pipe (15). The gas conveying pipe (15) penetrates through the top center of the filtering unit (5) and is connected with the discharging rod (6). The bottom end of the gas conveying pipe (15) penetrates through the bottom of the vehicle-mounted tank body (1) and is connected with an external gas source through a rotary joint.

6. A vehicle mounted system for purifying stray natural gas according to claim 5, wherein: A plurality of connection pipes (16) are fixedly connected to the outer wall of the gas conveying pipe (15) and are uniformly distributed in the radial direction. Nozzles (17) are installed at the ends of the connection pipes (16) to form a three-dimensional blowing structure in the filtering unit (5).

7. A system for purifying stranded natural gas on board a vehicle as claimed in claim 6, wherein: The vehicle-mounted tank body (1) is provided with a driving mechanism, which comprises a hydraulic push rod (18) and a transmission mechanism, the hydraulic push rod (18) is used to push the output pipe and the discharge rod (6) to move in the vertical direction, and the transmission mechanism is used to drive the output pipe to rotate in the horizontal direction.

8. A system for purifying stranded natural gas on board a vehicle as claimed in claim 7, characterized in that: The secondary filtration module comprises a plurality of continuous through processing tanks (19), the processing tanks (19) are sequentially provided with a precision filter element and a dryer in the gas flow direction, and the ends of the processing tanks (19) are connected with the storage cavity in the vehicle-mounted tank body (1).

9. A system for purifying stranded natural gas on board a vehicle as defined in claim 8, characterized in that: The vehicle-mounted tank body (1) is provided with a processing cavity (20) on the surface, the secondary filtration module is arranged in the processing cavity (20), and the surface of the vehicle-mounted tank body (1) is horizontally and slidingly connected with an arc-shaped push-pull plate (21) at the opening of the processing cavity (20) to close the processing cavity (20).

10. A method for purifying a vehicle-mounted scattered natural gas using the vehicle-mounted scattered natural gas purification process system according to any one of claims 1 to 9, characterized by, The method comprises the following steps: Step one, raw gas access and pressure stabilization, the low-pressure scattered natural gas of an oil field and a gas field is accessed into the vehicle-mounted tank body (1) through the gas inlet pipeline (2) of the gas inlet module, and the pressure is stabilized through the pressure regulating valve on the gas inlet pipeline (2); Step two, multi-stage gradient filtration of raw gas, the raw gas enters the cylinder (3) from top to bottom, first passes through the particle filter material layer to intercept dust and mechanical impurities, then the gas passes through the micropores on the surface of the circular table (9) into the filter cavity and the filter cover (12), and finally the gas enters the filter unit (5) to intercept small impurities and liquid water to complete preliminary purification; Step three, waste treatment, an external gas source supplies high-pressure gas to the gas conveying pipe (15) through the rotary joint, and the high-pressure gas is distributed to each high-pressure atomizing nozzle (17) through the connecting pipe (16); At the same time, the driving mechanism is started, the hydraulic push rod (18) drives the gas conveying pipe (15) and the discharge rod (6) to vertically lift, the transmission mechanism drives the gas conveying pipe (15) to horizontally rotate, the attached impurities in the crevice of the filter core are removed, and the impurities are sucked and discharged by the high-pressure negative pressure dust collector through the dust suction pipe one (13) and the dust suction pipe two (14); Step four, discharge treatment, the discharge mechanism is started, the driving mechanism drives the discharge rod (6) to move upwards through the hydraulic push rod (18), so that the closure piece (7) closes the bottom of the particle filter material layer, the driving mechanism drives the discharge rod (6) to rotate, the filter material in the particle filter material layer is pushed to the discharge pipe (11) through the push rod (10), and the discharge of the particle filter material is realized; Step five, the natural gas filtered through multiple stages is introduced into the secondary filtration module through the discharge pipeline (8) and sequentially flows through the continuous through processing tanks (19); Step six, storage and output, the purified gas after secondary filtration and deep dehydration is conveyed to the storage cavity in the vehicle-mounted tank body (1) through the pipeline.

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