An anti-erosion high-pressure natural gas multi-stage separation device and an adaptive drainage control system

Abstract

The application provides an anti-erosion high-pressure natural gas multi-stage separation device and a self-adaptive drainage control system. The device comprises a layer frame, a main shell, a cyclone assembly, a blade assembly and a demisting assembly. Through the combination of cyclone separation, gravity separation and blade demisting technology, and the structural design of the guide plate assembly and Z-shaped blades, efficient separation of gas, liquid and sand is realized. The control system includes a data acquisition and processing module and a control algorithm, which can automatically adjust the liquid level, pressure and optimize the separation efficiency. The application solves the problems of low operation flexibility, high artificial sand drainage intensity and other problems of existing sand separation systems, improves the integration, skid mounting and intelligent level of wellhead gas collection equipment, has the advantages of compact structure, high separation efficiency, stable operation, easy migration and other advantages, meets the separation precision requirements of fine particles for pipeline transportation, and has small investment and high reuse rate.

Description

Technical Field

[0001] This invention relates to the field of natural gas extraction and gathering equipment, specifically to an erosion-resistant high-pressure natural gas multi-stage separation device and an adaptive drainage and production control system. Background Technology

[0002] In natural gas extraction, hydraulic fracturing with sand injection is widely used in the development of unconventional gas fields such as shale gas and tight gas. This results in high wellhead pressure and severe, prolonged formation sand production during the production and drainage period. Sand particles moving with the airflow can easily cause erosion and wear on equipment, pipelines, and valves, affecting the safety of the gathering and transportation system. Existing sand removal and separation systems have many problems: large workload for sand removal and high labor intensity for sand discharge; low equipment operation flexibility and poor controllability of sand discharge; severe erosion and wear of internal components, frequent replacement, and short service life; some sand and gravel forming short-circuit flows within the equipment, resulting in low sand removal efficiency; the sand removal and separation functional modules are independent skids, making operation complex, requiring many maintenance points, and inconvenient to operate; increasing pipeline transport resistance, clogging equipment, and interfering with the normal operation of instruments and valves; increasing backup equipment and reducing utilization rate; polluting the environment and wasting resources.

[0003] Although domestic gas fields employ bottom-hole sand control measures, fine sand still enters the surface gathering and transportation system. Traditional gravity separation processes suffer from problems such as numerous large equipment, large land area requirements, high engineering costs, and insufficient utilization of system pressure. With gas field development, rising water cut increases the load on processing systems, leading to frequent technical upgrades, increased equipment, more complex processes, and higher investment. Therefore, there is an urgent need for reliable, safe, small-scale, integrated, and intelligent sand removal methods to address the impact of sand in produced gas on gathering, transportation, and processing systems, improve gathering and transportation efficiency, extend equipment lifespan, and reduce sand removal costs. Summary of the Invention

[0004] This invention develops a miniaturized, integrated, and intelligent desanding and liquid separation device suitable for field conditions. It integrates cyclone separation, gravity separation, and blade defoaming technologies. Through modular and integrated design, it utilizes CFD flow field simulation to optimize the equipment structure and internal components, thereby improving the integration, skid-mounted design, and intelligence of wellhead gas gathering equipment. This solves the problems of existing desanding and separation systems, such as low operational flexibility, high labor intensity of manual sand removal, low controllability of sand removal, short service life of internal components, low sand removal efficiency, and inconvenient operation.

[0005] This invention provides an anti-erosion high-pressure natural gas multi-stage separation device and an adaptive drainage and production control system. In one aspect, the anti-erosion high-pressure natural gas multi-stage separation device of this invention comprises a shelf, a main shell, a cyclone assembly, a blade assembly, and a demisting assembly. The shelving is divided into two layers, with the main shell placed on the first layer. The main shell is a horizontal tank. A swirl assembly is inserted into the top surface of one end, a demisting assembly is inserted into the other end, a sewage drain pipe is connected to the bottom, and an exhaust port is provided on the top surface in the middle. The swirling assembly has an air inlet on one side, an air outlet on the top surface, and is connected to the main housing at the bottom, with the swirler located inside. The demisting assembly has a second air inlet on one side, a second air outlet on the top surface, and is connected to the main housing at the bottom. The demister is located inside the assembly.

[0006] Preferably, inside the main housing, near the swirl assembly end, a guide vane assembly is provided, including a vertical baffle, a horizontal baffle, and an inclined guide vane.

[0007] Preferably, the demister of the demisting assembly is located in the middle, and the gas in the main housing enters the demister and is then discharged through the second outlet.

[0008] Preferably, the second air inlet of the demisting assembly is positioned horizontally lower than the demister, and the gas entering from the second air inlet enters the demister and is then discharged through the second air outlet.

[0009] Preferably, a blade assembly is provided at the exhaust port of the cyclone separator.

[0010] Preferably, the blade assembly consists of multiple sets of separate blades, which are arranged in a zigzag plate-like structure and are composed of multiple layers of Z-shaped interlaced and connected plates.

[0011] Using the above technical solution, the blade assembly of this invention utilizes a tortuous path to create a specific flow state for the gas. During the separation process, it employs the principles of kinetic energy collision, droplet adsorption and coalescence, and gravity settling, thereby achieving higher gas-liquid separation efficiency, lower operating pressure drop, and a wider operating flexibility range. Once the gas carrying droplets enters the channel of the high-efficiency separation blade, it is immediately separated into multiple regions by the blade. During its passage through each region, the gas is forced to undergo multiple rapid flow direction changes by the blade. Under the action of centrifugal force, the droplets will undergo multiple kinetic energy collisions with the blade. After adhering to the blade surface, the droplets form a liquid film through the coalescence effect between the droplets. The liquid film adhering to the blade surface is pushed into the blade interlayer under the combined action of its own gravity, liquid surface tension, and gas kinetic energy. In the interlayer, it converges into streams and flows into a horizontal tank below the blade for collection under gravity. Finally, clean gas that has undergone complete purification and no longer contains entrained droplets is obtained.

[0012] Preferably, the defogging component extends from the first shelf to the second shelf, and the second air inlet of the defogging component is connected to the air outlet of the swirl component through a pipe, and the two are at the same horizontal position.

[0013] Preferably, the bottom of the cyclone assembly is a drain port that is connected to the main shell. After being separated by the cyclone separator, the liquid and gravel enter the main shell through the drain port. Inside the main shell, the flow direction is guided by the guide plate assembly. Some natural gas also enters the main shell through the drain port and enters the demister assembly through the connection between the main shell and the demister assembly.

[0014] Preferably, a second plate is provided at the plate connection of each of the separating blades for separating free water carried in the gas.

[0015] On the other hand, the present invention also has an adaptive drainage and production control system suitable for a multi-stage natural gas separation device, including a data acquisition module, a data processing module, a control algorithm, and a communication module; the data acquisition module reads sensor data periodically with a sampling period of 1 second; the data processing module filters and linearizes the acquired data and calculates the processing volume and separation efficiency parameters; the control algorithm includes liquid level control, pressure control, and separation efficiency optimization algorithms.

[0016] Preferably, the liquid level control adopts PID control. When the liquid level reaches 80% of the set value, the electric drain valve is opened, and when the liquid level drops to 20% of the set value, it is closed. The pressure control is achieved by adjusting the opening of the electric throttle valve to keep the inlet pressure stable at 7.7MPa±0.1MPa.

[0017] Preferably, the separation efficiency optimization algorithm automatically adjusts the operating parameters of the cyclone assembly and the blade demister module based on the real-time monitored sand particle content and separation efficiency to ensure maximum separation efficiency.

[0018] The communication program enables Modbus communication between the controller and the remote terminal, uploading operating parameters to the remote terminal and receiving remote control commands. An alarm program is set up so that the controller issues an alarm signal and activates safety protection measures when the pressure exceeds 8.0 MPa, the liquid level exceeds 3.0 m, or the separation efficiency is below 95%.

[0019] This invention relates to a small-scale integrated natural gas desanding system. Through a combination of cyclone separation, gravity separation, and blade defoaming technology, it achieves multi-functional integration, optimizes equipment and internal components, and saves investment costs. It increases equipment functionality, enabling separate discharge of gas, liquid, and sand; improves separation efficiency and accuracy, meeting the requirements of over 90% classification efficiency for 5-10μm fine particles and 98% for 10μm and larger particles in pipeline transportation; solves problems such as low operational flexibility, high labor intensity of manual sand removal, low controllability of sand removal, short service life of internal components, low sand removal efficiency, and inconvenient operation; enhances the integration, skid-mounted design, and intelligence of wellhead gas gathering equipment; features a simple structure with no moving parts, resulting in low manufacturing and installation infrastructure investment; its modular, integrated, and skid-mounted design is compact, easy to install and transport, occupies a small area, and is easy to relocate; it has a high reusability rate, allowing it to be transferred to other well stations after sand removal from the gas well; the process is simple, and once the operating parameters are determined, it can operate stably for a long time, making management convenient. Attached Figure Description

[0020] Figure 1 This is a perspective view of an anti-erosion high-pressure natural gas multi-stage separation device according to the present invention.

[0021] Figure 2 This is a front view of an anti-erosion high-pressure natural gas multi-stage separation device according to the present invention.

[0022] Figure 3 This is a cross-sectional view of the main shell, cyclone assembly, and demister assembly of an anti-erosion high-pressure natural gas multi-stage separation device according to the present invention.

[0023] Figure 4 This is a left view of the main shell, cyclone assembly, and demister assembly of an anti-erosion high-pressure natural gas multi-stage separation device according to the present invention.

[0024] Figure 5 This is a schematic diagram of the blade assembly of an anti-erosion high-pressure natural gas multi-stage separation device according to the present invention, showing the separation of gas and free water.

[0025] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0026] Figure 7 This is a schematic diagram of the secondary separation device according to Embodiment 3 of the present invention.

[0027] Figure 8 yes Figure 7 A schematic diagram of part A.

[0028] In the diagram: 1-Shelf; 2-Main shell; 3-Swirl assembly; 4-Demisting assembly; 5-Sloping guide vane; 6-Vertical baffle; 7-Horizontal baffle; 8-Blade assembly; 31-Air inlet; 32-Air outlet; 33-Swirl generator; 34-Connection port between swirling assembly and main housing; 41-Second air inlet; 42-Second air outlet; 43-Demister; 44-Connection port between the demister assembly and the main housing 81-Separation blade; 82-Panel; 83-Second plate.

[0029] 9-U-shaped tube; 91-U-shaped tube front section; 92-Adsorption component; 93-Blocking section; 94-Extension section; 95-Cooling device; 96-Negative pressure device; 97-Air outlet; 98-Water outlet; 99-Switch. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious. All inventions utilizing the concept of the present invention are protected.

[0031] Example 1

[0032] As shown in Figures 1-5, the present invention provides an anti-erosion high-pressure natural gas multi-stage separation device and an adaptive drainage and production control system. In one aspect, the anti-erosion high-pressure natural gas multi-stage separation device of the present invention comprises a frame 1, a main shell 2, a swirl assembly 3, a blade assembly, and a demisting assembly 4. Among them, shelf 1 is divided into two layers, with the main shell 2 placed on the first layer; The main shell 2 is a horizontal tank. A swirl assembly 3 is inserted into the top surface of one end, a demisting assembly 4 is inserted into the other end, a sewage drain pipe is connected to the bottom, and an exhaust port is provided on the top surface in the middle. The swirling assembly 3 has an air inlet 31 on one side, an air outlet 32 ​​on the top surface, and is connected to the main housing 2 at the bottom. The swirler 33 is located inside the assembly. The demisting assembly 4 has a second air inlet 41 on one side, a second air outlet 42 on the top surface, and is connected to the main housing 2 at the bottom. The demister 43 is located inside the assembly.

[0033] Preferably, inside the main housing 2, near the end of the swirl assembly 3, a guide plate assembly is provided, including a vertical baffle plate 6, a horizontal baffle plate 7, and an inclined guide plate 5.

[0034] By adopting the above scheme, the flow direction of fluids (including liquids, gravel, and some natural gas) entering the main shell 2 from the cyclone assembly 3 can be guided, allowing the fluids to flow in the main shell 2 along a reasonable path, avoiding fluid turbulence from affecting the separation effect, and helping subsequent gas-liquid separation processes to proceed in an orderly manner.

[0035] Preferably, the demister 43 of the demisting assembly 4 is located in the middle, and the gas in the main housing 2 enters the demister 43 and is then discharged through the second air outlet 42.

[0036] By adopting the above scheme, the gas coming from the main housing 2 can first enter the core area of ​​the demister 43, and the demister 43 can be used to demister the gas to remove the liquid droplets entrained in the gas, so that the gas discharged through the second gas outlet 42 is cleaner and the quality of the separated gas is improved.

[0037] Preferably, the second air inlet 41 of the demisting component 4 is positioned horizontally lower than the demister 43, and the gas entering from the second air inlet 41 enters the demister 43 and is then discharged through the second air outlet 42.

[0038] By adopting the above scheme, the gas entering from the second air inlet 41 is allowed to flow upward naturally through the demister 43 by taking advantage of the gas’s own flow characteristics, thereby extending the gas’s residence time in the demister assembly 4 and improving the demister effect. At the same time, gravity-assisted droplet separation is used to make the droplets easier to settle and separate.

[0039] Preferably, a blade assembly is provided at the exhaust port of the cyclone separator 33.

[0040] By adopting the above scheme, the gas that has been initially separated by the hydrocyclone 33 is further processed by the blade assembly at the exhaust port. The blade assembly is used to achieve deep gas-liquid separation, improve the overall gas-liquid separation efficiency, and make up for the shortcomings of the single separation of the hydrocyclone 33.

[0041] Preferably, the blade assembly consists of multiple sets of separate blades, which are arranged in a zigzag plate-like structure and are composed of multiple layers of Z-shaped interlaced and connected plates.

[0042] Using the above technical solution, the blade assembly of this invention utilizes a tortuous path to create a specific flow state for the gas. During the separation process, it employs the principles of kinetic energy collision, droplet adsorption and coalescence, and gravity settling, thereby achieving higher gas-liquid separation efficiency, lower operating pressure drop, and a wider operating flexibility range. Once the gas carrying droplets enters the channel of the high-efficiency separation blade, it is immediately separated into multiple regions by the blade. During its passage through each region, the gas is forced to undergo multiple rapid flow direction changes by the blade. Under the action of centrifugal force, the droplets will undergo multiple kinetic energy collisions with the blade. After adhering to the blade surface, the droplets form a liquid film through the coalescence effect between the droplets. The liquid film adhering to the blade surface is pushed into the blade interlayer under the combined action of its own gravity, liquid surface tension, and gas kinetic energy. In the interlayer, it converges into streams and flows into a horizontal tank below the blade for collection under gravity. Finally, clean gas that has undergone complete purification and no longer contains entrained droplets is obtained.

[0043] Preferably, the defogging component 4 extends from the first layer of the shelf 1 to the second layer of the shelf 1, and the second air inlet 41 of the defogging component 4 is connected to the air outlet 32 ​​of the swirl component 3 through a pipe and is in the same horizontal position.

[0044] By adopting the above scheme, the space of the shelf 1 can be reasonably utilized to arrange the demisting component 4, while ensuring that the air outlet 32 ​​of the swirl component 3 and the second air inlet 41 of the demisting component 4 are horizontally aligned, so that the gas can flow smoothly from the swirl component 3 into the demisting component 4, reducing gas flow resistance and avoiding airflow obstruction or liquid accumulation affecting separation due to height difference or horizontal difference.

[0045] Preferably, the bottom of the cyclone assembly 3 is a drain port, which is connected to the main shell 2. After being separated by the cyclone separator 33, the liquid and gravel enter the main shell 2 through the drain port. Inside the main shell 2, the flow is guided by the guide plate assembly. Some natural gas also enters the main shell 2 through the drain port and enters the demister assembly 4 through the connection between the main shell 2 and the demister assembly 4.

[0046] By adopting the above scheme, the liquid, gravel and some natural gas separated by the hydrocyclone 33 are allowed to enter the main shell 2 in a reasonable manner. Guided by the guide plate assembly, the liquid and gravel flow in an orderly manner for easy collection and treatment. Some natural gas can also enter the demisting component 4 for secondary separation, thereby improving the overall separation effect and making full use of the equipment space and process.

[0047] Preferably, a second plate is provided at the plate connection of each of the separating blades for separating free water carried in the gas.

[0048] By adopting the above solution, the free water in the gas is further intercepted and separated by the second plate, which enhances the separation effect of free water, allowing the moisture in the gas to be separated more fully, thereby improving the dryness of the gas and the quality of the separated gas.

[0049] Example 2

[0050] This invention also features an adaptive drainage and production control system suitable for multi-stage natural gas separation devices, including a data acquisition module, a data processing module, a control algorithm, and a communication module. The data acquisition module reads sensor data periodically with a sampling period of 1 second. The data processing module filters and linearizes the acquired data and calculates the processing volume and separation efficiency parameters. The control algorithm includes liquid level control, pressure control, and separation efficiency optimization algorithms.

[0051] Preferably, the liquid level control adopts PID control. When the liquid level reaches 80% of the set value, the electric drain valve is opened, and when the liquid level drops to 20% of the set value, it is closed. The pressure control is achieved by adjusting the opening of the electric throttle valve to keep the inlet pressure stable at 7.7MPa±0.1MPa.

[0052] Preferably, the separation efficiency optimization algorithm automatically adjusts the operating parameters of the cyclone assembly 3 and the blade defoaming module based on the real-time monitored sand content and separation efficiency to ensure maximum separation efficiency.

[0053] The communication program enables Modbus communication between the controller and the remote terminal, uploading operating parameters to the remote terminal and receiving remote control commands. An alarm program is set up so that the controller issues an alarm signal and activates safety protection measures when the pressure exceeds 8.0 MPa, the liquid level exceeds 3.0 m, or the separation efficiency is below 95%. This invention adopts a combination of cyclone separation, gravity separation and blade defoaming technology. The main body is a horizontal gravity separator (main shell 2), with a cyclone separator (cyclone assembly 3) installed at the inlet, and liquid separation devices such as guide plates added inside.

[0054] The cyclone assembly 3 is the core pre-separation unit of the device. Its basic structure consists of a cylinder, a cone, an overflow pipe, an underflow pipe, and a feed pipe. The gas-liquid-solid mixed medium enters the cyclone chamber through the tangential inlet (air inlet 31). It rotates at high speed in the cyclone chamber, generating eddies. The liquid moves downward while rotating. After entering the conical section, the inner diameter decreases and the rotation speed increases. Due to the density difference between gas, liquid, and solid, under the action of centrifugal force, centripetal buoyancy, and fluid drag, the denser component moves towards the side wall of the cyclone separator 33 and is discharged from the underflow port; the less dense, lighter dispersed phase moves towards the low-pressure area of ​​the axis, forming an internal cyclone and is discharged from the overflow port (air outlet 32).

[0055] The main shell 2 is a horizontal separation cylinder, with an orifice plate for gas flow guidance and an inclined plate for liquid flow guidance installed inside. The inclined plate has an inclination angle of 3-6°, which helps to reduce the impact of incoming liquid. After the gas-liquid-solid mixture is pre-separated by the cyclone assembly 3, the unseparated part enters the horizontal separation section, the gas enters the demister 43 upward through the guide orifice plate, and the liquid and sand particles are discharged through the drain pipe.

[0056] A high-efficiency blade demisting and separation element is installed at the outlet 32 ​​of the cyclone assembly 3, employing the principles of kinetic collision, droplet adsorption and coalescence, and gravity sedimentation to achieve gas-liquid separation. Gas carrying droplets enters the blade channel, is divided into multiple regions, and undergoes multiple flow direction changes. Under centrifugal force, the droplets collide with the blades, adhere to form a liquid film, and flow into a horizontal tank below the blades for collection. The blade structure includes single-group, double-group, four-group, and eight-group combinations. This device uses a four-group blade structure, achieving a separation efficiency of over 99.9% for droplets larger than 8μm and 80% for droplets smaller than 1μm. The operating pressure drop is 0.3-0.4 kPa, with an operating flexibility of 20% above the upper limit.

[0057] The overall skid-mounted structure adopts a modular and integrated skid design, with overall dimensions of 8.2m × 3.0m × 4.5m and a weight of approximately 18 tons. The skid-mounted structure includes the main equipment body, piping system, instrumentation and control system, safety protection devices, etc., which facilitates installation, transportation and relocation, and is reusable.

[0058] In this invention, sand-containing natural gas enters the skid and then enters the inlet 31 of the cyclone assembly 3 through a DN150 inlet pipe. It rotates at high speed within the cyclone chamber. Most of the gas is introduced through a DN80 pipe to the outlet 32, where it is further separated by the blades and discharged. A small portion of gas, liquid, and sand particles are introduced into the main housing 2 through a conical shell. Under the action of the flow stabilizing orifice plate, the gas passes through the orifice plate and is separated by gravity, mixing with the gas coming from the overflow port. It is then further separated by the blade assembly and enters the pipeline system. The liquid diverted by the cyclone assembly 3 is stored in the main housing 2. Once a certain volume is reached, liquid is automatically discharged through level control, and the information is transmitted remotely. Larger sand particles after cyclone separation sink to the sand discharge inclined plate, while finer sand particles are carried towards the flow stabilizing orifice plate by the airflow, where they are blocked and then settle. Liquid and sand particles that are not completely separated by gravity are carried into the blade separation assembly with the gas, where they collide, accumulate, and then settle.

[0059] Technical parameters of the present invention in practical applications; Cyclone assembly 3: Maximum throughput 120×10 4 m³ / d, inlet (air inlet 31) flow velocity 15~20m / s, removal rate of quartz sand and ceramsite with particle size ≥0.1mm 97%, pressure drop not greater than 1kpa.

[0060] Main shell 2: cylinder diameter 1400mm, length 4000mm, orifice plate length 1400mm, height 600mm, inclined plate length 2200-2400mm, underflow pipe distance from weld 850mm, exhaust pipe distance from weld 450mm.

[0061] Blade assembly: separation efficiency > 99.9% for droplets larger than 8μm, operating pressure drop 0.3-0.4KPa, and operating flexibility 20%.

[0062] Overall unit: working pressure 7.7MPa, design pressure 8.5MPa, working temperature 18-50℃, design temperature -20-80℃, main body material Q345R normalized, 16MnIII, geometric volume 7.80m³, skid-mounted geometric dimensions 8.2×3.0×4.5m.

[0063] In one embodiment of the invention, the inlet length of the natural gas affects the tangential and axial velocity distribution of the cyclone separation section. Increasing the inlet length can reduce the tangential velocity of the gas in the area surrounding the overflow pipe, reduce cyclone losses and expansion losses at the inlet, and thus reduce the pressure drop. The separation efficiency increases linearly with increasing Li, and then tends to stabilize. The optimal inlet length is 250-300 mm, with 300 mm being the best.

[0064] Natural gas inlet angle α: The inlet angle affects velocity distribution and separation performance. Increasing the inlet angle can reduce the average static pressure and the tangential velocity component of the gas flow, reduce pressure drop, and improve overall separation efficiency. An inclined inlet enhances multiphase flow stratification, making it less likely for small-diameter sand particles to be entrained by the gas flow. A 27° inclined inlet is recommended.

[0065] The wear of the hydrocyclone 33 in this invention is mainly due to cutting erosion, frictional erosion, and impact erosion. The overflow inner tube, cylindrical cavity, and conical section are the most severely worn areas. Wear-resistant and corrosion-resistant materials such as engineering plastics, nickel-based alloys, and ceramics are selected. The main body of the hydrocyclone 33 is made of Q345R normalized 16MnIII. The inner wall of the hydrocyclone assembly 3 is coated with tungsten carbide to improve wear resistance. The inner surface is machined smoothly to avoid cavitation and reduce frictional erosion. The inlet flow line is designed as an Archimedean spiral to ensure smooth fluid transition and reduce impact erosion.

[0066] Example 3

[0067] like Figure 6-8As shown, this embodiment differs from Embodiment 1. In order to solve the problem of further separation of the natural gas containing free water and gravel that sinks after the initial three-phase separation, a secondary separation device is provided in the main shell. The feed inlet of the secondary separation device is located at the discharge outlet at the bottom of the cyclone assembly. The secondary separation device includes a U-shaped tube, the end of which is connected to the main shell. The bottom of the U-shaped tube has an adsorption assembly, and the gas outlet of the U-shaped tube has a negative pressure device.

[0068] Since the natural gas after secondary separation has some free water attached, the U-shaped tube has a downward-curved extension section. The U-shaped tube body is equipped with a heating device, and the extension section is equipped with a cooling device. The free water is heated and vaporized into water vapor, and then condensed into water and sinks through the cooling device.

[0069] To achieve more effective secondary separation of sand and gravel, the front end of the U-shaped tube is spiral-shaped, and the spiral-shaped part has a heating device specifically a heating wire.

[0070] Preferably, the outlet of the U-shaped tube extension section includes a water outlet and an air outlet, wherein the water outlet is vertically downward and the material outlet is horizontal to both sides.

[0071] Preferably, the adsorption component specifically comprises a surface filter screen and a bottom filter cloth, and the bottom of the adsorption component has a switch that can be opened to replace the filter screen and filter cloth.

[0072] Preferably, the outlet end of the adsorption component is provided with a barrier section, and the pore size of the outlet end is smaller than that of the inlet end.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An erosion-resistant high-pressure natural gas multi-stage separation device, characterized in that, It consists of a shelf (1), a main shell (2), a swirl assembly (3), a blade assembly, and a demisting assembly (4); Among them, the shelf (1) is divided into two layers, with the main shell (2) placed on the first layer. The main shell (2) is a horizontal tank. A swirl assembly (3) is inserted into the top surface of one end, and a demisting assembly (4) is inserted into the other end. A sewage drain pipe is connected to the bottom, and an exhaust port is provided on the top surface in the middle. The swirling assembly (3) has an air inlet (31) on one side, an air outlet (32) on the top surface, and is connected to the main housing (2) at the bottom. The swirler (33) is located inside. The demisting assembly (4) has a second air inlet (41) on one side and a second air outlet (42) on the top surface. The bottom is connected to the main housing (2), and the demister (43) is located inside. A secondary separation device is provided inside the main housing. The feed inlet of the secondary separation device is located at the discharge outlet at the bottom of the cyclone assembly. The secondary separation device includes a U-shaped tube (9). The end of the U-shaped tube (9) is connected to the main housing. The bottom of the U-shaped tube (9) has an adsorption assembly (92), and the air outlet of the U-shaped tube (9) has a negative pressure device (96). Since the natural gas after secondary separation has some free water attached, the U-shaped tube (9) has a downwardly curved extension section (94), and the body of the U-shaped tube (9) is equipped with a heating device. The extension section (94) is equipped with a cooling device (95) to heat and vaporize some of the free water into water vapor, and then condense it into water and let it sink through the cooling device (95); based on more effective separation of sand and gravel, the front end of the U-shaped tube (9) is spiral-shaped, and the spiral part has a heating device specifically a heating wire; the outlet of the extension section (94) of the U-shaped tube (9) includes a water outlet and an air outlet, the water outlet is vertically downward, and the air outlet is horizontal to both sides; the adsorption component (92) is specifically a filter screen on the surface and a filter cloth on the bottom, and the bottom of the adsorption component (92) has a switch to open and replace the filter screen and filter cloth; the outlet end of the adsorption component (92) is equipped with a barrier section, and the aperture of the outlet end is smaller than that of the inlet end; The demister (43) of the demister assembly (4) is located in the middle. The gas from the main housing (2) enters the demister (43) and is then discharged through the second outlet (42). The second inlet (41) of the demister assembly (4) and the outlet (32) of the swirl assembly (3) are connected by a pipe and are in the same horizontal position.

2. The erosion-resistant high-pressure natural gas multi-stage separation device according to claim 1, characterized in that, Inside the main housing (2), near the end of the swirl assembly (3), there is a guide plate assembly, including a vertical baffle plate (6), a horizontal baffle plate (7), and an inclined guide plate (5).

3. The erosion-resistant high-pressure natural gas multi-stage separation device according to claim 1, characterized in that, The second air inlet (41) of the demisting assembly (4) is positioned horizontally lower than the demister (43). The gas entering from the second air inlet (41) enters the demister (43) and is then discharged through the second air outlet (42).

4. The erosion-resistant high-pressure natural gas multi-stage separation device according to claim 1, characterized in that, A blade assembly is provided at the exhaust port of the cyclone separator (33).

5. The erosion-resistant high-pressure natural gas multi-stage separation device according to claim 4, characterized in that, The blade assembly consists of multiple sets of separate blades, which are arranged in a zigzag plate-like structure and composed of multiple layers of Z-shaped interlaced and connected plates.

6. The erosion-resistant high-pressure natural gas multi-stage separation device according to claim 1, characterized in that, The defogging component (4) extends from the first layer of the shelf (1) to the second layer of the shelf (1).

7. An adaptive drainage and production control system for a multi-stage natural gas separation unit, used to control the erosion-resistant high-pressure natural gas multi-stage separation unit according to any one of claims 1-6, characterized in that, It includes a data acquisition module, a data processing module, a control algorithm, and a communication module. The data acquisition module reads sensor data periodically with a sampling period of 1 second. The data processing module filters and linearizes the acquired data and calculates the processing volume and separation efficiency parameters. The control algorithm includes liquid level control, pressure control, and separation efficiency optimization algorithms.

8. An adaptive drainage and production control system for a natural gas multi-stage separation unit according to claim 7, characterized in that, The liquid level control adopts PID control. When the liquid level reaches 80% of the set value, the electric drain valve is opened, and when the liquid level drops to 20% of the set value, it is closed. The pressure control is achieved by adjusting the opening of the electric throttle valve to keep the inlet pressure stable at 7.7MPa±0.1MPa.

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