Sectional type dehydration and desanding system of natural gas gathering station

Abstract

The utility model discloses a sectional type dehydration and desanding system of a natural gas gathering station, which comprises a first vertical separator, a second vertical separator, a compressor, a flash tank and a sewage tank, the system is provided with a plurality of treatment passages such as double separators, a single first vertical separator, a single second vertical separator, bypass treatment and the like, and each key pipeline is provided with a gate valve. According to the utility model, solid-liquid impurities such as light condensate, silt, rock particles and the like in natural gas are efficiently separated; faults such as shutdown caused by entering of impurities into the compressor are effectively avoided, and stable operation of the compressor is guaranteed; processing passages can be flexibly switched according to gas incoming conditions to adapt to gas flow fluctuation; and meanwhile, the maintenance and transport maintenance cost is reduced, the vertical separator is convenient to prefabricate, the land demand is reduced, and the intensification of the construction and investment of the gas gathering station is realized.

Description

Technical Field

[0001] This utility model relates to the field of natural gas dehydration and desanding technology, specifically to a segmented dehydration and desanding system for a natural gas gathering station. Background Technology

[0002] Currently, the Ordos Basin gas field mainly adopts a medium-low pressure gas gathering process, which includes "downhole throttling, medium-low pressure gas gathering, inter-well connection, trunk pipeline pigging, ambient temperature separation, dry desulfurization, two-stage pressurization, and centralized purification." In this process, after the gas production pipeline transports natural gas to the gas gathering station, it undergoes gas-liquid separation through a production separator to remove free water from the natural gas. The separated natural gas is then metered and transported externally.

[0003] However, numerous challenges arise in actual production. Due to the severe liquid and sand content in the incoming gas, the compressor frequently experiences "shutdowns" and incomplete closure of the inlet valve, preventing it from operating normally. In-depth analysis reveals that these problems stem from the poor gas-liquid and gas-solid separation performance of the gas collection equipment: First, the equipment struggles to handle sudden slug flows upstream, resulting in untimely liquid discharge at high liquid levels, causing the gas, water, and sand mixture to be directly pushed to the compressor inlet; Second, the cross-sectional area of ​​the main drain pipe for both normal and emergency liquid discharge is insufficient to meet the rapid liquid discharge requirements at high liquid levels; Third, the relationship between the separated gas volume and the gas-liquid interface is unclear, with the gas-liquid interface set too high, leading to excessively high gas phase velocity and a large amount of liquid being entrained into the compressor; Fourth, the gas rectification effect in the middle section of the dual-cylinder separator is poor, increasing the end-of-line interception load; Fifth, the internal end-of-line interception design (including area planning and wire mesh selection) is unreasonable, resulting in a large amount of liquid remaining uninterrupted even in the absence of slug flows.

[0004] In the process of natural gas extraction and gathering, liquid and solid impurities are ubiquitous. If the gas purification process at the gathering station is flawed or the equipment operates unstablely, not only will impurities and moisture in the natural gas be difficult to remove completely, affecting its quality, but it may also cause corrosion and blockages in subsequent transportation and utilization equipment. Furthermore, the gas volume entering the gathering station fluctuates frequently due to factors such as changes in well production and wellhead malfunctions. When the fluctuation is too large, it can easily lead to equipment instability problems such as compressor surge, seriously threatening the normal production of the gathering station. Therefore, developing a segmented natural gas dehydration and sand removal process for gathering stations is of crucial practical significance for ensuring the stable, long-term, and safe operation of the gathering station. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a segmented dehydration and sand removal system for natural gas gathering stations.

[0006] This utility model discloses a segmented dehydration and sand removal system for a natural gas gathering station, comprising:

[0007] The first vertical separator has an inlet connected to the main raw gas pipeline and an outlet connected to the first gas pipeline. The first gas pipeline is connected to the raw gas branch pipeline and the third gas pipeline via the second gas pipeline. The bottom sand discharge port is connected to the sand box. The first vertical separator is equipped with a first branch distributor, a sieve plate and a first end intercepting wire mesh element in sequence along the gas flow direction.

[0008] The second vertical separator has its inlet connected to the first gas pipeline via a fourth gas pipeline and its outlet connected to a fifth gas pipeline. The fifth gas pipeline is connected in parallel with the third gas pipeline and then connected to the first inlet pipeline of the compressor. The second vertical separator is provided with a first branch distributor, a coalescing element, a canopy interception element and a second end interception wire mesh element in sequence along the gas flow direction.

[0009] The compressor has its first inlet connected to the compressor's first inlet pipeline and its outlet connected to the purified gas output pipeline.

[0010] Gate valves are installed on the main raw gas pipeline, the branch raw gas pipeline, the first inlet pipeline of the compressor, and each gas pipeline.

[0011] As a further improvement to this utility model, it also includes:

[0012] The flash tank has its bottom drain ports of the first and second vertical separators connected to the first liquid branch line and the second liquid branch line, respectively. The first and second liquid branch lines are connected in parallel and then connected to the main liquid line. The outlet of the main liquid line is connected to the inlet of the flash tank. The gas phase outlet of the flash tank is connected to the second inlet of the compressor through the sixth gas line.

[0013] The outlet of the main liquid pipeline is also connected to the wastewater tank, and the liquid phase outlet of the flash tank is connected to the wastewater tank through a sewage discharge pipeline.

[0014] As a further improvement of this utility model, gate valves are provided on the first liquid branch line, the second liquid branch line, the inlet line of the sewage tank, the inlet line of the flash tank, and the sewage discharge line. Filters and check valves are also provided on the first and second liquid lines.

[0015] As a further improvement to this utility model,

[0016] As a further improvement of this utility model, the raw material gas main pipeline, the first vertical separator, the first gas pipeline, the fourth gas pipeline, the second vertical separator, the fifth gas pipeline, the first inlet pipeline of the compressor, the compressor, and the purified gas output pipeline together constitute a dual separator processing path.

[0017] The main raw gas pipeline, the first vertical separator, the first gas pipeline, the second gas pipeline, the third gas pipeline, the first inlet pipeline of the compressor, the compressor, and the purified gas output pipeline together constitute the processing path of the single first vertical separator.

[0018] The raw material gas branch line, the second gas line, the fourth gas line, the second vertical separator, the fifth gas line, the first inlet line of the compressor, the compressor, and the purified gas output line together constitute the processing path of the single second vertical separator.

[0019] The raw material gas branch line, the third gas line, the compressor first inlet line, the compressor, and the purified gas output line together constitute a bypass treatment path.

[0020] As a further improvement of this utility model, both the first inlet pipeline of the compressor and the purified gas output pipeline are equipped with bypass pipelines.

[0021] The compressor’s first inlet pipeline and its bypass pipeline are both equipped with conical filters, and gate valves are installed at both ends of the conical filters.

[0022] Flow meters are installed on both the purified gas output pipeline and its bypass pipeline, and gate valves are installed at both ends of the flow meters.

[0023] As a further improvement of this utility model, both the first and second branch distributors include a vertical section and a horizontal section connected to the lower end of the vertical section; the upper ends of the vertical sections of the first and second branch distributors are respectively connected to the inlet of their respective vertical separators, and a plurality of holes are provided in the lower middle part of the vertical section and the horizontal section; the horizontal sections of the first and second branch distributors are placed below the liquid surface of their respective vertical separators.

[0024] As a further improvement of this utility model, the coalescing element is a porous defoaming plate; the second vertical separator has staggered partition plates arranged above and below the porous defoaming plate, and the porous defoaming plate is placed between the upper and lower partition plates.

[0025] As a further improvement of this utility model, the umbrella cover interception element includes an upper umbrella panel, a middle umbrella panel, and a lower umbrella panel arranged from top to bottom, with an airflow channel formed at the center of the upper umbrella panel and the lower umbrella panel; an airflow channel is formed between the upper umbrella panel and the middle umbrella panel, and between the middle umbrella panel and the lower umbrella panel.

[0026] As a further improvement of this utility model, the height of the umbrella cover intercepting element is 1000-1500mm, the umbrella cover cone angle is <15°, and the layer height between the upper, middle and lower umbrella panels is 50-100mm.

[0027] As a further improvement of this utility model, both the first end intercepting wire mesh element and the second end intercepting wire mesh element are wire mesh demisters, and the wire mesh demisters are fixed to the top of the first vertical separator and the second vertical separator by a fixing structure.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] This invention achieves efficient separation of solid and liquid impurities such as light condensate, silt, and rock particles from the raw natural gas in a gas gathering station by using two vertical separators connected in series and various internal components working together. The first branch distributor evenly distributes gas, the sieve plate intercepts solids, and the coalescing and umbrella-shaped interception elements promote droplet separation. The end-intercepting wire mesh element intercepts tiny droplets, reducing impurities entering the compressor and thus avoiding malfunctions such as "shutdown". The flash tank and sewage pipeline work together, with the help of gate valves, filters, and check valves, to ensure timely and smooth discharge of liquid during slug flow.

[0030] In this invention, multiple processing pathways (dual separators, single first vertical separator, single second vertical separator, and bypass) are combined with gate valves to flexibly switch modes according to the incoming gas conditions, rationally allocate gas volume, control the gas phase empty cylinder velocity, and prevent liquid entrainment. The coalescing element and partition plate in the second vertical separator rectify the gas, reduce the end interception load, ensure stable operation of the compressor, reduce equipment failures caused by gas volume fluctuations, and achieve long-term safe operation of the gas collection station.

[0031] This invention also reduces maintenance and upkeep costs, meets the gas quality requirements of the compressor through efficient separation, and extends its operating time; the equipment adopts a vertical structure, which is convenient for factory prefabrication, reduces on-site construction and land acquisition needs, and realizes the intensification of gas gathering station construction and investment. Attached Figure Description

[0032] Figure 1 This is a structural diagram of a segmented dehydration and sand removal system for a natural gas gathering station, as disclosed in one embodiment of this utility model.

[0033] Figure 2 This is a schematic diagram of the structure of the first vertical separator of the segmented dehydration and sand removal system for a natural gas gathering station, as disclosed in one embodiment of this utility model.

[0034] Figure 3 This is a schematic diagram of the structure of the second vertical separator in a segmented dehydration and sand removal system for a natural gas gathering station, as disclosed in one embodiment of this utility model.

[0035] In the picture:

[0036] 1. First vertical separator; 1-1. First branch distributor; 1-2. Screen plate; 1-3. First end intercepting wire mesh element; 1-4. First sand collecting plate; 2. Second vertical separator; 2-1. Second branch distributor; 2-2. Cohesion element; 2-3. Umbrella intercepting element; 2-4. Second end intercepting wire mesh element; 2-5. Second sand collecting plate; 3. Compressor; 4. Flash tank; 5. Wastewater tank; 6. Sand box; 7. Gate valve; 8. Filter; 9. Check valve; 10. Conical filter; 11. Flow meter; 12. Safety valve;

[0037] 13. Raw material gas main pipeline; 14. Raw material gas branch pipeline; 15. First gas pipeline; 16. Second gas pipeline; 17. Third gas pipeline; 18. Fourth gas pipeline; 19. Fifth gas pipeline; 20. Compressor first inlet pipeline; 21. Compressor first inlet bypass pipeline; 22. Purified gas output pipeline; 23. Purified gas output bypass pipeline; 24. Sixth gas pipeline; 25. First liquid branch pipeline; 26. Second liquid branch pipeline; 27. Liquid main pipeline; 28. Sand discharge pipeline. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] like Figure 1 As shown, a segmented dehydration and sand removal system for a natural gas gathering station according to this utility model includes: a first vertical separator 1, a second vertical separator 2, a compressor 3, a flash tank 4, a wastewater tank 5, and a sand box 6. The inlet of the first vertical separator 1 is connected to the main raw gas pipeline 13, and the outlet is connected to the first gas pipeline 15. The first gas pipeline 15 is connected to the raw gas branch pipeline 14 and the third gas pipeline 17 via the second gas pipeline 16. The sand discharge port at the bottom of the first vertical separator 1 is connected to the sand box 6 via the sand discharge pipeline 28. Inside the first vertical separator 1, a first branch distributor 1-1, a sieve plate 1-2, and a first end intercepting wire mesh element 1-3 are sequentially arranged along the gas flow direction. The second vertical separator 1... The inlet of the vertical separator 2 is connected to the first gas pipeline 15 via the fourth gas pipeline 18, and the outlet is connected to the fifth gas pipeline 19. The fifth gas pipeline 19 is connected in parallel with the third gas pipeline 17 and then connected to the first inlet pipeline 20 of the compressor. The second vertical separator 2 is equipped with a second branch distributor 2-1, a coalescing element 2-2, a canopy interception element 2-3 and a second end interception wire mesh element 2-4 in sequence along the gas flow direction. The first inlet of the compressor 3 is connected to the first inlet pipeline 20 of the compressor, and its outlet is connected to the purified gas output pipeline 22. The main raw gas pipeline 13, the branch raw gas pipeline 14, the sand discharge pipeline 28, the first inlet pipeline 20 of the compressor and each gas pipeline are equipped with gate valves 7.

[0043] In the above embodiments, preferably, the bottom drain ports of the first vertical separator 1 and the second vertical separator 2 are connected to the first liquid branch line 25 and the second liquid branch line 26, respectively. The first liquid branch line 25 and the second liquid branch line 26 are connected in parallel and then connected to the main liquid line 27. The outlet of the main liquid line 27 is connected to the inlet of the flash tank 4. The gas phase outlet of the flash tank 4 is connected to the second inlet of the compressor through the sixth gas line 24. The second inlet pipeline of the compressor is connected to the second inlet of the compressor. The outlet of the main liquid line 27 is also connected to the sewage tank 5. The liquid phase outlet of the flash tank 4 is connected to the sewage tank 5 through the drain line. A gate valve 7 and a check valve 9 are installed on the drain line.

[0044] In the above embodiments, preferably, gate valves 7 are provided on the first liquid branch line 25, the second liquid branch line 26, the inlet line of the sewage tank 5, the inlet line of the flash tank 4, and the sewage discharge line. Filters 8 and check valves 9 are also provided on the first liquid line 25 and the second liquid line 26.

[0045] Specifically:

[0046] In the above embodiments, preferably, the compressor 3 is a screw reciprocating type, and the compressor 3 is equipped with a buffer tank, a pipeline air-cooling system and an automatic control system.

[0047] In the above embodiments, preferably, the flash tank 4 is a pressure storage tank with a design pressure of 4.0 MPa and a volume of 20 m³. 3 The flash tank 4 is equipped with a safety valve 12 and a vent line on its top, and the sixth gas line 24 has a pipe size of DN100. In this embodiment, the flash tank 4 receives liquid from the first vertical separator 1 and / or the second vertical separator 2. The flash tank 4 flashes the residual gas, and the recovered gas enters the second inlet of the compressor 3 through the sixth gas line 24. The oily wastewater discharged from the flash tank 4 is transported to the wastewater tank 5 for storage through the sewage line.

[0048] In the above embodiment, preferably, the sewage tank 5 is a pressure storage tank with a design pressure of 4.0 MPa and a volume of 30 m³. 3 The top of the sewage tank 5 is equipped with a gate valve 7 and a check valve 9, which are connected to the flash tank 4 via a sewage discharge pipeline. The sewage discharge pipeline has a pipe size of DN80.

[0049] like Figure 2 As shown, in the above embodiment, preferably, the first vertical separator 1 is a preliminary pre-separation unit. The first vertical separator 1 has an overall structure that is coarser at the bottom and thinner at the top. The first vertical separator 1 is composed of a first end intercepting wire mesh element 1-3, a sieve plate 1-2, a first branch distributor 1-1, and a first sand collecting plate 1-4. It mainly realizes segmented block flow interception, water washing to remove sand and solid particles, breaking up fog, and preliminary separation of large particles of free water within the pipeline. In the above embodiment, preferably, the diameter of the first vertical separator 1 is 1.6-2.2m, the cylinder length of the first vertical separator 1 is 5m-9.6m, the natural gas processing capacity of the first vertical separator 1 is 100×10⁴ Nm³ / d, the working pressure is 4.0MPa, and the separation effect of the first vertical separator 1 is: separated droplet size > 50-100um, and separated solid content ≤ 0.5-1%.

[0050] In the above embodiment, preferably, the first branch distributor 1-1 includes a vertical section and a horizontal section connected to the lower end of the vertical section; wherein the upper end of the vertical section is connected to the inlet of the first branch distributor 1-1, and a plurality of holes are provided in the lower middle part of the vertical section and on the horizontal section; and the horizontal section of the first branch distributor 1-1 is positioned below the liquid surface. In this embodiment, the opening area of ​​the first branch distributor 1-1 is not less than the pipe area of ​​the raw material gas main pipeline 13. During normal operation, the horizontal section of the first branch distributor 1-1 is submerged below the liquid surface, so that solid particles and condensate in the gas are initially washed and absorbed below the liquid surface.

[0051] In the above embodiments, preferably, the sieve plate 1-2 is fixed inside the first vertical separator 1 by a fixed structure. The sieve plate 1-2 can separate the separated gas and liquid again, and at the same time rectify the gas and further settle it by gravity.

[0052] In the above embodiments, preferably, a first sand collecting plate 1-4 is provided at the bottom of the first vertical separator 1. The first sand collecting plate 1-4 has an inverted conical structure, which can effectively collect the separated solid particles and liquid.

[0053] In the above embodiment, preferably, the first end intercepting wire mesh element 1-3 is a wire mesh demister. The wire mesh demister is fixed in the first vertical separator 1 by a fixing structure. The wire mesh demister can intercept and separate foam and fine-particle liquid in the gas.

[0054] In actual operation, after the natural gas feedstock enters the first vertical separator 1, it is sprayed out through the holes of the first branch distributor 1-1. Solid particles and droplets are washed under the liquid in the separator to separate large-diameter impurities. After washing, it carries the liquid into the high-speed screen plate 1-2 to filter out the clumps of mist and liquid. A wire mesh demister is installed at the top of the first vertical separator 1 to further separate the unsettled droplets and solid particles.

[0055] In the above embodiment, preferably, the first vertical separator 1 is equipped with a safety valve 12, the outlet of which is connected to a venting pipeline.

[0056] like Figure 3 As shown, in the above embodiment, preferably, the second vertical separator 2 is a secondary high-efficiency separator, internally composed of a second branched distributor 2-1, a coalescing element 2-2, an umbrella-shaped interception element 2-3, a second end-intercepting wire mesh element 2-4, and a second sand collecting plate 2-5, to achieve defoaming filtration and separation of fine-particle water. In the above embodiment, preferably, the diameter of the second vertical separator 2 is 0.8–1.5 m, the height of the second vertical separator 2 is 6–8 m, and the separation effect of the second vertical separator 2 is: separated droplet size > 50–100 μm, separated solid content ≤ 0.5–1%.

[0057] In the above embodiments, preferably, the structure and arrangement of the second branch distributor 2-1 and the second sand collecting plate 2-5 are the same as those in the first vertical separator 1, and will not be described in detail here.

[0058] In the above embodiments, preferably, the coalescing element 2-2 is a porous defoaming plate; the vertical separator B is provided with staggered partition plates above and below the porous defoaming plate, and the porous defoaming plate is placed between the upper and lower partition plates so that the airflow through the porous defoaming plate is in an "S" shape.

[0059] In the above embodiments, preferably, the umbrella cover interception element 2-3 includes an upper umbrella panel, a middle umbrella panel, and a lower umbrella panel arranged from top to bottom, with an airflow channel formed at the center of the upper umbrella panel and the lower umbrella panel; an airflow channel is formed between the upper umbrella panel and the middle umbrella panel, and between the middle umbrella panel and the lower umbrella panel.

[0060] In the above embodiments, preferably, the height of the umbrella cover intercepting element 2-3 is 1000-1500mm, the umbrella cover cone angle is <15°, and the layer height between the upper, middle and lower umbrella panels is 50-100mm.

[0061] In the above embodiment, preferably, the second end intercepting wire mesh element 2-4 is a wire mesh demister. This wire mesh demister is fixed to the top of the second vertical separator 2 by a fixing structure. The wire mesh demister is designed to intercept and separate foam and fine-particle liquid in the gas. In this embodiment, the overall thickness of the wire mesh demister is not less than 300 mm.

[0062] In the above embodiment, preferably, the second vertical separator 2 is equipped with a safety valve 12, the outlet of which is connected to a venting pipeline.

[0063] like Figure 1As shown, in the above embodiment, preferably, both the compressor first inlet pipeline 20 and the purified gas output pipeline 22 are equipped with bypass pipelines; that is, the compressor first inlet pipeline 20 is connected in parallel with the compressor first inlet bypass pipeline 21, and the purified gas output pipeline 22 is connected in parallel with the purified gas output bypass pipeline 23. Both the compressor first inlet pipeline 20 and the compressor first inlet bypass pipeline 21 are equipped with conical filters 10, and gate valves 7 are installed at both the inlet and outlet of the conical filters 10. The conical filters 10 are mesh-type conical filters. Both the purified gas output pipeline 22 and the purified gas output bypass pipeline 23 are equipped with flow meters 11, and gate valves 7 are installed at both ends of the flow meters 11. The installation of the compressor first inlet bypass pipeline 21 allows for further separation of the natural gas at the compressor's first inlet. It also improves the redundancy of the equipment. In this embodiment, the pipe size of the compressor first inlet pipeline 20, the compressor first inlet bypass pipeline 21, the purified gas output pipeline 22, and the purified gas output bypass pipeline 23 is DN200, and the pressure rating is 4.0 MPa.

[0064] In the above embodiments, preferably, the raw material gas main line 13, the first vertical separator 1, the first gas line 15, the fourth gas line 18, the second vertical separator 2, the fifth gas line 19, the compressor first inlet line 20 (and / or the compressor first inlet bypass line 21), the compressor 3, and the purified gas output line 22 (and / or the purified gas output bypass line 23) together constitute a dual separator processing path;

[0065] The raw material gas main line 13, the first vertical separator 1, the first gas line 15, the second gas line 16, the third gas line 17, the compressor first inlet line 20 (and / or the compressor first inlet bypass line 21), the compressor 3, and the purified gas output line 22 (and / or the purified gas output bypass line 23) constitute a single first vertical separator processing path.

[0066] The raw gas branch line 14, the second gas line 16, the fourth gas line 18, the second vertical separator 2, the fifth gas line 19, the compressor first inlet line 20 (and / or the compressor first inlet bypass line 21), the compressor 3, and the purified gas output line 22 (and / or the purified gas output bypass line 23) together constitute the processing path of the single second vertical separator.

[0067] The raw material gas branch line 14, the third gas line 17, the compressor first inlet line 20 (and / or the compressor first inlet bypass line 21), the compressor 3, and the purified gas output line 22 (and / or the purified gas output bypass line 23) together constitute the bypass treatment path.

[0068] In this embodiment, the first vertical separator 1 and the second vertical separator 2 are key equipment for the segmented dehydration and sand removal of natural gas. The two separators operate in series, or they can operate independently depending on the natural gas supply. By setting up a bypass processing path, the goal of uninterrupted gas gathering and transportation during equipment maintenance and repair can also be achieved.

[0069] Advantages of this utility model:

[0070] This invention achieves efficient separation of solid and liquid impurities such as light condensate, silt, and rock particles from the raw natural gas in a gas gathering station through the series connection of two vertical separators and the synergy of various internal components. In particular, the separation effect of viscous micro-droplets, clumps of foam, and solid particles is significant. The first branch distributor 1-1 distributes gas evenly, the sieve plate 1-2 intercepts solids, the coalescing element 2-2 and the umbrella interception element 2-3 promote droplet separation, and the end interception wire mesh element intercepts micro-droplets, reducing impurities entering the compressor 3 and thus avoiding malfunctions such as "shutdown". The flash tank 4 and the sewage pipeline work together, with the help of the gate valve 7, filter 8, and check valve 9, to ensure timely and smooth discharge of liquid during slug flow.

[0071] In this utility model, multiple processing pathways (dual separators, single first vertical separator 1, single second vertical separator 2, and bypass) are combined with gate valve 7 to flexibly switch modes according to the incoming gas conditions, rationally allocate gas volume, control the gas phase empty cylinder speed, and prevent liquid entrainment. The coalescing element 2-2 and the partition plate in the second vertical separator 2 rectify the gas, reduce the end interception load, ensure stable operation of the compressor, reduce equipment failures caused by gas volume fluctuations, and achieve long-term safe operation of the gas collection station.

[0072] This invention also reduces maintenance and upkeep costs, meets the gas quality requirements of the compressor through efficient separation, and extends its operating time; the equipment adopts a vertical structure, which is convenient for factory prefabrication, reduces on-site construction and land acquisition needs, and realizes the intensification of gas gathering station construction and investment.

[0073] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A segmented dehydration and sand removal system for a natural gas gathering station, characterized in that, include: The first vertical separator has an inlet connected to the main raw gas pipeline and an outlet connected to the first gas pipeline. The first gas pipeline is connected to the raw gas branch pipeline and the third gas pipeline via the second gas pipeline. The bottom sand discharge port is connected to the sand box. The first vertical separator is equipped with a first branch distributor, a sieve plate and a first end intercepting wire mesh element in sequence along the gas flow direction. The second vertical separator has its inlet connected to the first gas pipeline via a fourth gas pipeline and its outlet connected to a fifth gas pipeline. The fifth gas pipeline is connected in parallel with the third gas pipeline and then connected to the first inlet pipeline of the compressor. The second vertical separator is provided with a second branch distributor, a coalescing element, a canopy interception element and a second end interception wire mesh element in sequence along the gas flow direction. The compressor has its first inlet connected to the compressor's first inlet pipeline and its outlet connected to the purified gas output pipeline. Gate valves are installed on the main raw gas pipeline, the branch raw gas pipeline, the first inlet pipeline of the compressor, and each gas pipeline.

2. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, Also includes: The flash tank has its bottom drain ports of the first and second vertical separators connected to the first liquid branch line and the second liquid branch line, respectively. The first and second liquid branch lines are connected in parallel and then connected to the main liquid line. The outlet of the main liquid line is connected to the inlet of the flash tank. The gas phase outlet of the flash tank is connected to the second inlet of the compressor through the sixth gas line. The outlet of the main liquid pipeline is also connected to the wastewater tank, and the liquid phase outlet of the flash tank is connected to the wastewater tank through a sewage discharge pipeline.

3. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 2, characterized in that, Gate valves are installed on the first liquid branch line, the second liquid branch line, the inlet line of the sewage tank, the inlet line of the flash tank, and the sewage discharge line. Filters and check valves are also installed on the first and second liquid lines.

4. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, The raw material gas main pipeline, the first vertical separator, the first gas pipeline, the fourth gas pipeline, the second vertical separator, the fifth gas pipeline, the first inlet pipeline of the compressor, the compressor, and the purified gas output pipeline together constitute the dual separator processing path. The main raw gas pipeline, the first vertical separator, the first gas pipeline, the second gas pipeline, the third gas pipeline, the first inlet pipeline of the compressor, the compressor, and the purified gas output pipeline together constitute the processing path of the single first vertical separator. The raw material gas branch line, the second gas line, the fourth gas line, the second vertical separator, the fifth gas line, the first inlet line of the compressor, the compressor, and the purified gas output line together constitute the processing path of the single second vertical separator. The raw material gas branch line, the third gas line, the compressor first inlet line, the compressor, and the purified gas output line together constitute a bypass treatment path.

5. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, Both the compressor's first inlet pipeline and the purified gas output pipeline are equipped with bypass pipelines. The compressor’s first inlet pipeline and its bypass pipeline are both equipped with conical filters, and gate valves are installed at both ends of the conical filters. Flow meters are installed on both the purified gas output pipeline and its bypass pipeline, and gate valves are installed at both ends of the flow meters.

6. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, Both the first and second branched distributors include a vertical section and a horizontal section connected to the lower end of the vertical section; the upper ends of the vertical sections of the first and second branched distributors are respectively connected to the inlet of their respective vertical separators, and several holes are provided in the lower middle part of the vertical section and on the horizontal section; the horizontal sections of the first and second branched distributors are positioned below the liquid surface of their respective vertical separators.

7. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, The coalescing element is a porous defoaming plate; in the second vertical separator, staggered partition plates are arranged above and below the porous defoaming plate, and the porous defoaming plate is placed between the upper and lower partition plates.

8. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, The umbrella cover interception element includes an upper umbrella panel, a middle umbrella panel, and a lower umbrella panel arranged from top to bottom. An airflow channel is formed between the center of the upper umbrella panel and the lower umbrella panel. An airflow channel is formed between the upper umbrella panel and the middle umbrella panel, and between the middle umbrella panel and the lower umbrella panel.

9. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 8, characterized in that, The height of the umbrella cover intercepting element is 1000-1500mm, the umbrella cover cone angle is <15°, and the height between the upper, middle and lower umbrella panels is 50-100mm.

10. The segmented dehydration and sand removal system for a natural gas gathering station according to claim 1, characterized in that, Both the first and second end intercepting wire mesh elements are wire mesh demisters, which are fixed to the top of the first and second vertical separators by a fixing structure.

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