A gas inlet pretreatment system for a molecular sieve dehydration skid

Abstract

The utility model belongs to natural gas molecular sieve dehydration sled equipment technical field discloses a kind of molecular sieve dehydration skid gas inlet pretreatment system, it includes: tank body, tank body inner chamber is divided into lower liquid storage chamber and upper liquid storage chamber, coalescence filter element is equipped in upper liquid storage chamber;Further include filter element lead-out pipe, upper liquid outlet and lower liquid outlet;Filter element lead-out pipe is arranged in coalescence filter element mounting support lower;Upper liquid outlet is set in the bottom of upper liquid storage chamber, for discharging liquid in upper liquid storage chamber;Lower liquid outlet is set in the bottom of lower liquid storage chamber, for discharging liquid in lower liquid storage chamber;Lower liquid storage chamber and the tank body side wall of upper liquid storage chamber are also respectively equipped with gas inlet and gas outlet.The utility model is by adding airflow distributor, liquid baffle, upper liquid storage chamber and liquid outlet and other structures, and cooperate liquid level meter and differential pressure gauge monitoring, system significantly improves gas-liquid separation efficiency and practicality, and prevents secondary atomization and filter element submergence, guarantees the stable operation of molecular sieve dehydration process.

Description

Technical Field

[0001] This utility model relates to the technical field of natural gas molecular sieve dehydration skid equipment, specifically to an air intake pretreatment system for a molecular sieve dehydration skid. Background Technology

[0002] In natural gas processing, the pretreatment stage of the molecular sieve dehydration skid intake is crucial, as its effectiveness directly impacts the dehydration efficiency of the molecular sieve and the stable operation of subsequent processes. Currently, the pretreatment of the molecular sieve dehydration skid intake mainly employs a vertical filter, internally filled with a coalescing filter element, to effectively separate and remove impurities from the feed gas.

[0003] Existing vertical filters (reference) Figure 1 The workflow is as follows: Raw gas enters the lower space of the pretreatment system through the gas inlet. First, it undergoes gravity settling separation to separate large liquid droplets entrained in the gas. The settled liquid flows downwards into the storage chamber and is subsequently discharged through the lower drain valve. The gas, having had large droplets removed by gravity separation, enters the coalescing filter element from the inside out. During this process, solid particulate impurities are intercepted and isolated inside the filter element, agglomerate, and fall into the storage chamber, where they are discharged along with the previously separated liquid through the lower drain valve. The filtered gas then leaves the filter through the gas outlet and enters the molecular sieve for the next dehydration process. Furthermore, the pretreatment system body is equipped with a pressure gauge interface and a flange cover. The pressure gauge interface allows for real-time monitoring of the equipment pressure; the flange cover is an openable structure, connected and sealed to the filter body with bolts, facilitating filter element replacement or equipment maintenance.

[0004] Existing vertical filters can separate and remove impurities from raw gas, but they still have many problems in actual operation, mainly including the following:

[0005] 1. Low efficiency of gravity sedimentation: After the gas enters the pretreatment system from the gas inlet, although gravity sedimentation is used to separate liquid water, the gas has a certain flow rate in the filter, which easily forms a gas-liquid carry-over phenomenon, resulting in low coarse separation efficiency and difficulty in achieving the ideal separation effect.

[0006] 2. Structural design defects affect separation effect: The distance between the gas inlet and the upper filter element baffle is too close, which prevents the gas from undergoing sufficient gravity sedimentation separation. A large amount of liquid enters the upper filter element assembly with the gas, which not only increases the wear of the coalescing filter element, but also reduces the overall treatment effect.

[0007] 3. The problem of secondary atomization is prominent: When water is present in the liquid storage chamber, the gas at the gas inlet forms turbulence in the lower separation zone, disturbing the liquid in the liquid storage chamber and causing the settled liquid to form droplets again, resulting in secondary atomization and further affecting the coarse separation efficiency.

[0008] 4. Filter Cartridge Water Accumulation and Liquid Droplet Regeneration: After the gas containing liquid droplets flows through the coalescing filter cartridge, solid particles are intercepted, while the liquid entrained in the gas penetrates the filter cartridge. Small droplets coalesce into larger droplets on the filter cartridge surface and accumulate at the top of the filter due to gravity. Since the coalescing filter cartridge is directly installed on the filter isolation plate, there is no drain outlet in this area, and the accumulated liquid will gradually submerge the filter cartridge, resulting in a reduction in the filtration area. At the same time, the continuous flow of gas through the submerged part of the filter cartridge's outer surface will generate a bubbling phenomenon, producing new liquid droplets, which will enter the molecular sieve process through the gas outlet.

[0009] 5. Delayed filter replacement: Filter replacement is primarily based on the initial gas quality and its calculated lifespan. When the gas quality changes over a period of time, impurities increase rapidly, or the filter itself malfunctions, it must be replaced promptly. However, because the pre-separation system is not visually inspected, filter problems cannot be detected in time, leading to the equipment operating with defects and affecting pretreatment efficiency.

[0010] 6. Problems with clogging and cleaning the lower drain port: The raw gas may contain sand and solid particles, which can easily cause clogging at the lower drain port of the pretreatment system and the elbow of the equipment body. Once clogged, cleaning the drain port becomes very difficult due to the limitations of the elbow structure.

[0011] As can be seen from the above analysis, existing vertical filters have many problems, resulting in poor practicality. Therefore, it is urgent to improve the structure of vertical filters to solve the problems existing in the current technology. Utility Model Content

[0012] The purpose of this invention is to propose an air intake pretreatment system for a molecular sieve dehydration skid, which solves at least one technical problem in the background art, such as preventing the liquid in the upper liquid storage chamber from directly submerging the bottom of the filter element, ensuring the filtration effect, and is highly practical.

[0013] The technical solution adopted to achieve the purpose of this utility model is:

[0014] An air intake pretreatment system for a molecular sieve dehydration skid includes:

[0015] The tank body has an internal cavity divided into a lower liquid storage chamber and an upper liquid storage chamber. The upper liquid storage chamber is equipped with a coalescing filter element. It also includes a filter element outlet pipe, an upper drain port, and a lower drain port.

[0016] The filter cartridge outlet pipe is located under the coalescing filter cartridge mounting support, which is used to raise the filter cartridge and leave liquid storage space at the bottom of the filter cartridge;

[0017] The upper drain port is located at the bottom of the upper liquid storage chamber and is connected to the external sewage system through the upper drain pipe to drain the liquid in the upper liquid storage chamber;

[0018] The lower drain port is located at the bottom of the lower liquid storage chamber and is connected to the external sewage system through the lower drain pipe to discharge the liquid in the lower liquid storage chamber;

[0019] The lower and upper liquid storage chambers are also equipped with air inlets and outlets on their side walls.

[0020] In actual operation, the device of this invention allows the raw gas to enter the tank through the inlet. First, it undergoes gravity settling separation in the lower liquid storage chamber, where large droplets and some impurities are separated and fall into the lower liquid storage chamber. Then, the gas flows upward through the coalescing filter element, where solid particulate impurities are intercepted inside the filter element, and small droplets are coalesced into larger droplets that fall into the upper liquid storage chamber. The gas treated by the filter element is discharged from the outlet and enters subsequent processes. The liquid in the upper and lower liquid storage chambers is periodically discharged through the upper and lower drain ports, respectively, maintaining a stable liquid level within the system and preventing water accumulation and liquid foam regeneration in the filter element, making it highly practical.

[0021] Furthermore, it also includes an airflow distributor and an extension pipe installed in the lower liquid storage chamber, with the airflow distributor connected to the air inlet via the extension pipe.

[0022] Furthermore, it also includes a coalescing separation plate disposed in the lower liquid storage chamber, and the coalescing separation plate is located above the airflow distributor.

[0023] Furthermore, it also includes a baffle plate disposed in the lower liquid storage chamber, and a coalescing separation plate is located below the airflow distributor.

[0024] Furthermore, it also includes a first differential pressure gauge interface and a second differential pressure gauge interface respectively opened on the side walls of the lower liquid storage chamber and the upper liquid storage chamber.

[0025] Furthermore, it also includes a pressure gauge interface located on the side wall of the upper liquid storage chamber.

[0026] Furthermore, a bend is provided at the lower drain outlet, and a detachable flange is provided between the bend and the lower drain pipe.

[0027] Furthermore, a level gauge is also provided on the side wall of the lower liquid storage chamber.

[0028] Furthermore, a lid is also provided on the top of the tank.

[0029] The beneficial effects of this utility model are as follows:

[0030] 1. By adding structures such as an airflow distributor, a baffle plate, an upper liquid storage chamber, and a drain port, and by cooperating with a level gauge and a differential pressure gauge for monitoring, this utility model significantly improves the gas-liquid separation efficiency and practicality of the system, and prevents secondary atomization and filter element submersion, thus ensuring the stable operation of the molecular sieve dewatering process.

[0031] 2. By setting a filter cartridge outlet pipe, this utility model can raise the position of the filter cartridge and leave a liquid storage space at the bottom of the filter cartridge to prevent the liquid in the upper liquid storage chamber from directly submerging the bottom of the filter cartridge, thus ensuring the filtration effect; at the same time, the setting of the upper drain port can further maintain the stability of the liquid level in the upper liquid storage chamber, making it highly practical.

[0032] 3. This utility model stabilizes and directs the high-speed airflow by combining the airflow distributor and the extension tube, which significantly improves the separation efficiency and practicality of the air intake pretreatment system for molecular sieve dehydration skids.

[0033] 4. The coalescing separation plate in this utility model effectively reduces the number of tiny droplets remaining in the gas through physical interception and coalescence, preventing these droplets from being re-atomized due to airflow disturbance in subsequent processes. This protects the adsorption performance of the molecular sieve dehydration skid, ensures that the water dew point of the outlet gas is stable and meets the standard, and improves the separation efficiency of the system.

[0034] 5. The baffle plate in this utility model can prevent the liquid from being re-rolled up by the airflow, avoiding the "secondary atomization" phenomenon. By preventing secondary atomization of the liquid, the liquid content of the gas entering the coalescing filter element is significantly reduced, further extending the service life of the coalescing filter element.

[0035] 6. This utility model further reduces the accumulation of impurities at the drain outlet and lowers the risk of blockage by setting a bend and a detachable flange at the lower drain outlet; at the same time, the detachable flange makes cleaning operations possible without cutting pipes or disassembling the entire tank, which is convenient for maintenance and highly practical.

[0036] 7. This utility model connects to the corresponding device through the first differential pressure gauge interface, the second differential pressure gauge interface, and the pressure gauge interface, and works in conjunction with the liquid level gauge to achieve comprehensive monitoring of the filter element status, liquid level height, and system pressure, effectively improving the operational stability and maintenance efficiency of the system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the prior art of this utility model.

[0039] Figure 2 This is a schematic diagram of the air intake pretreatment system for molecular sieve dehydration skids of this utility model.

[0040] In the diagram: 1. Tank body; 2. Lower liquid storage chamber; 3. Upper liquid storage chamber; 4. Coalescing filter element; 5. Filter element outlet pipe; 6. Upper drain pipe; 7. Lower drain pipe; 8. Air inlet; 9. Air outlet; 10. Airflow distributor; 11. Extension pipe; 12. Coalescing separation plate; 13. Baffle plate; 14. First differential pressure gauge interface; 15. Second differential pressure gauge interface; 16. Pressure gauge interface; 17. Bend; 18. Removable flange; 19. Level gauge; 20. Cover. Detailed Implementation

[0041] The illustrated embodiments are provided to better illustrate the present invention, but the content of the present invention is not limited to the illustrated embodiments. Therefore, non-essential improvements and adjustments made to the implementation schemes by those skilled in the art based on the above-described content of the present invention still fall within the protection scope of the present invention.

[0042] like Figure 2 As shown, an air intake pretreatment system for a molecular sieve dehydration skid includes: a tank 1, the inner cavity of which is divided into a lower liquid storage chamber 2 and an upper liquid storage chamber 3, and a coalescing filter element 4 is provided in the upper liquid storage chamber 3; it also includes a filter element outlet pipe 5, an upper drain port and a lower drain port; the filter element outlet pipe 5 is located under the mounting support of the coalescing filter element 4, used to raise the filter element and leave a liquid storage space at the bottom of the filter element; the upper drain port is opened at the bottom of the upper liquid storage chamber 3 and is connected to an external sewage system through an upper drain pipe 6, used to discharge the liquid in the upper liquid storage chamber 3; the lower drain port is opened at the bottom of the lower liquid storage chamber 2 and is connected to an external sewage system through a lower drain pipe 7, used to discharge the liquid in the lower liquid storage chamber 2; an air inlet 8 and an air outlet 9 are respectively provided on the side walls of the tank 1 of the lower liquid storage chamber 2 and the upper liquid storage chamber 3.

[0043] Upper drain port and lower drain port.

[0044] The device of this utility model is mainly an improvement on the existing device. Compared with the existing device, the positions of the air inlet 8 and the air outlet 9 remain unchanged. In this utility model, the tank body 1 serves as the main structure of the entire pretreatment system, and its internal cavity is divided into two parts, a lower liquid storage chamber 2 and an upper liquid storage chamber 3, by a horizontal partition. The tank body 1 is made of pressure-resistant and corrosion-resistant materials to adapt to the needs of different gas compositions and working environments. The side walls of the tank body 1 are respectively provided with air inlets 8 and air outlets 9 for the entry and exit of gas.

[0045] The lower storage chamber 2 is used to collect liquid water and impurities separated from the gas. It has a lower drain port at its bottom, connected to an external sewage system via a lower drain pipe 7, for periodically draining the liquid from the lower storage chamber 2. The upper storage chamber 3 is located at the top of the tank body 1, separated from the lower storage chamber 2 by a horizontal partition. It has an upper drain port at its bottom, connected to an external sewage system via an upper drain pipe 6, for draining the liquid collected in the upper storage chamber 3. The upper storage chamber 3 also contains a coalescing filter element 4, used to further intercept and coalesce solid particulate impurities and small droplets in the gas. The coalescing filter element 4 is fixed by a filter element mounting bracket and is made of multiple layers of special fiber material, possessing the function of intercepting solid particulate impurities and coalescing small droplets. An air inlet 8 is provided on the side wall of the lower storage chamber 2, through which the raw material gas enters the tank body 1. The gas outlet 9 is located on the side wall of the upper liquid storage chamber 3. The pretreated gas is discharged from the gas outlet 9 and enters the next process of the molecular sieve dehydration skid.

[0046] After the gas enters the lower liquid storage chamber 2 through the air inlet 8, it enters the coalescing filter element 4 through the filter element outlet pipe 5. As the gas passes through the coalescing filter element 4 from the inside out, solid particulate impurities are intercepted inside the coalescing filter element 4, while small droplets are coalesced into larger droplets, which eventually fall into the upper liquid storage chamber 3 under the action of gravity. The filter element outlet pipe 5 is located under the mounting support of the coalescing filter element 4 and is a vertically downward pipe. Its function is to raise the position of the filter element, leaving a liquid storage space at the bottom of the filter element, and preventing the liquid in the upper liquid storage chamber 3 from directly submerging the bottom of the filter element, thus affecting the filtration effect. Specifically, the filter element outlet pipe 5 of this utility model is a vertically downward extending metal pipe with a length of 50-100mm. It is fixed to the mounting support of the coalescing filter element 4 by welding, ensuring that there is a 50-100mm liquid storage space between the bottom of the filter element and the bottom of the upper liquid storage chamber 3.

[0047] The upper drain port is located at the bottom of the upper liquid storage chamber 3 and is connected to the external sewage system via the upper drain pipe 6. When the liquid in the upper liquid storage chamber 3 accumulates to a certain amount, it is discharged through the upper drain port to maintain a stable liquid level in the upper liquid storage chamber 3. The lower drain port is located at the bottom of the lower liquid storage chamber 2 and is connected to the external sewage system via the lower drain pipe 7. It is used to periodically discharge the liquid and impurities in the lower liquid storage chamber 2 to prevent the lower liquid storage chamber 2 from overflowing or becoming clogged, further avoiding water accumulation and liquid foam regeneration in the filter element, making it highly practical.

[0048] In actual operation, after the raw gas enters the tank 1 through the inlet 8, it first undergoes gravity settling separation in the lower liquid storage chamber 2. Large droplets and some impurities are separated and fall into the lower liquid storage chamber 2. Subsequently, the gas flows upward through the coalescing filter element 4, where solid particulate impurities are intercepted inside the filter element, and small droplets are coalesced into larger droplets and fall into the upper liquid storage chamber 3. The gas treated by the filter element is discharged from the outlet 9 and enters the subsequent process. The liquid in the upper liquid storage chamber 3 and the lower liquid storage chamber 2 is discharged periodically through the upper drain port and the lower drain port, respectively, to maintain a stable liquid level in the system. The entire system effectively removes liquid water and solid particulate impurities from the raw gas through physical separation and coalescing, improving the treatment effect and service life of the molecular sieve dehydration skid.

[0049] In one embodiment of the present invention, an airflow distributor 10 and an extension pipe 11 are disposed in the lower liquid storage chamber 2, and the airflow distributor 10 is connected to the air inlet 8 through the extension pipe 11.

[0050] The airflow distributor 10 in this invention is a common device in the prior art, such as the gas injection device disclosed in patent publication number CN221607997U. The airflow distributor 10, through the directional design of guide vanes or honeycomb units, forces the airflow into the inner cavity of the tank 1 in a preset direction, avoiding lateral diffusion or reverse flow. In this invention, the forced airflow enters the tank 1 in a vertically downward direction. The stable airflow direction reduces the disturbance of the gas to the settled liquid in the lower liquid storage chamber 2, preventing the liquid from being blown up again to form droplets (i.e., secondary atomization), thereby reducing the droplet load on the coalescing filter element 4 and protecting subsequent filtration processes. The extension pipe 11 is a section of pipe made of metal or corrosion-resistant plastic, and its inner diameter is selected according to the flow rate and velocity of the raw gas to ensure smooth gas passage. One end of the extension pipe 11 is tightly connected to the air inlet 8, and the other end is connected to the airflow distributor 10. The connection method can be flange connection, welding, or threaded connection, ensuring a good seal at the connection to prevent gas leakage. This invention further optimizes the airflow path through the combined design of the extension tube 11 and the airflow distributor 10, stabilizing the high-speed airflow and directing its flow, which significantly improves the separation efficiency and practicality of the air intake pretreatment system for molecular sieve dehydration skids.

[0051] During operation, when the raw gas enters the tank 1 at high speed from the inlet 8, direct impact on the gravity separator or uneven local flow velocity can lead to a decrease in gas-liquid separation efficiency. This invention guides the airflow to the airflow distributor 10 via the extension pipe 11. Utilizing the perforated plate, honeycomb structure, or guide vanes of the airflow distributor 10, the high-speed airflow is dispersed into multiple low-speed, uniform fine streams. This uniformly distributed airflow makes it easier for large droplets and impurities to settle under gravity, avoiding the "gas-liquid carryover" phenomenon caused by airflow turbulence or excessively high local flow velocity. This significantly improves gravity separation efficiency, increasing the pre-separation efficiency from ≥50μm, 80% to ≥50μm, 95% in practical applications.

[0052] In another embodiment of the present invention, a coalescing separation plate 12 is provided in the lower liquid storage chamber 2, and the coalescing separation plate 12 is located above the airflow distributor 10.

[0053] The coalescing separation plate 12 in this utility model is a common device in the prior art, as disclosed in patent CN201871284U. The coalescing separation plate 12 is fixed in the lower liquid storage chamber 2 by a bracket. It should be noted that the bracket design needs to take into account the vibration stability when gas passes through, so as to avoid deformation of the plate due to airflow impact.

[0054] During operation, after the gas is uniformly guided by the airflow distributor 10, it flows upward through the coalescing separator 12. Tiny droplets in the gas collide with the surface of the corrugated plate during the flow, and some droplets are adsorbed onto the plate surface. The gas flow direction frequently changes within the coalescing separator 12, and the droplets continue to contact the plate surface under inertia, gradually coalescing into larger droplets. Due to their increased mass, the coalesced droplets slide down the corrugated plate surface under gravity and eventually fall to the bottom of the lower liquid storage chamber 2. Through physical interception and coalescence, the coalescing separator 12 effectively reduces the amount of residual tiny droplets in the gas, preventing these droplets from re-atomizing due to airflow disturbances in subsequent processes. This protects the adsorption performance of the molecular sieve dehydration skid and ensures that the water dew point of the outlet gas remains stable and meets the standards.

[0055] In another embodiment of the present invention, a baffle plate 13 is provided in the lower liquid storage chamber 2, and the baffle plate 13 is located below the airflow distributor 10.

[0056] In this invention, the baffle plate 13 is parallel to the bottom surface of the tank 1 and its edges are sealed against the inner wall of the tank 1. Its surface is smooth to reduce droplet adhesion. When gas enters the lower liquid storage chamber 2 uniformly downward through the airflow distributor 10, the baffle plate 13 forms a physical barrier through its horizontal structure, completely isolating the settled liquid in the lower liquid storage chamber 2 from the airflow above. Even at high gas flow rates, the baffle plate 13 can prevent the liquid from being re-entrained by the airflow, avoiding the phenomenon of "secondary atomization". By preventing secondary atomization of the liquid, the liquid content of the gas entering the coalescing filter element 4 is significantly reduced, further extending the service life of the coalescing filter element 4.

[0057] In one embodiment of this invention, the baffle plate 13 has a raised structure in the middle. Designing the baffle plate 13 with a raised middle structure increases the impact force and turbulence effect, more effectively separating gas and liquid. Its principle is the same as the structure disclosed in patent publication number CN221607997U. Natural gas containing condensate enters through the inlet 8 and directly impacts the raised middle structure of the baffle plate 13, making gas-liquid separation more thorough and improving the separation effect. The separated liquid flows along the baffle plate 13 to the inner wall of the tank 1 and flows by gravity to the bottom of the lower storage chamber 2, effectively preventing the liquid from remixing. In a preferred embodiment of this invention, the baffle plate 13 is an arc-shaped plate with a raised middle, the height of which is 1 / 10-1 / 5 of the tank diameter, and its surface is smooth to enhance the gas-liquid separation effect.

[0058] In another embodiment of this utility model, a first differential pressure gauge interface 14 and a second differential pressure gauge interface 15 are respectively provided on the side walls of the lower liquid storage chamber 2 and the upper liquid storage chamber 3. The first differential pressure gauge interface 14 and the second differential pressure gauge interface 15 are respectively installed on the side walls of the lower liquid storage chamber 2 and the upper liquid storage chamber 3. The two differential pressure gauge interfaces are connected to a differential pressure gauge to monitor the pressure difference between the two liquid storage chambers in real time. By reading the differential pressure value of the differential pressure gauge, the working status of the coalescing filter element 4 can be intuitively understood. When the system differential pressure exceeds a certain threshold (e.g., ≥0.05Mpa), the system is opened and the coalescing filter element 4 is replaced. At the same time, when the differential pressure exceeds the threshold, the differential pressure gauge triggers an alarm signal to prompt the operator to inspect the filter element or clean the liquid storage chamber, avoiding the equipment from operating with defects, reducing the increase in energy consumption caused by excessive pressure drop, avoiding equipment damage and safety accidents, and significantly improving the reliability and safety of the system of this utility model.

[0059] In another embodiment of this invention, a pressure gauge interface 16 is also provided on the side wall of the upper liquid storage chamber 3. By providing the pressure gauge interface 16 on the side wall of the upper liquid storage chamber 3, this invention allows for real-time monitoring of the gas pressure within the upper liquid storage chamber 3. After deep separation by the coalescing filter element 4, the gas enters the upper liquid storage chamber 3. The pressure gauge interface 16, connected to an external pressure gauge, can directly collect the static pressure within the upper liquid storage chamber 3, reflecting the pressure state of the gas after passing through the filter element. Operators can directly observe system pressure changes through the dial. The pressure in the upper liquid storage chamber 3 is closely related to the degree of filter element blockage, the unobstructed flow of the drain outlet, and the load of the downstream molecular sieve process. If the pressure in the upper liquid storage chamber 3 rises abnormally, it may indicate blockage of the drain outlet or severe blockage of the filter element, requiring immediate shutdown and maintenance to prevent equipment damage due to overpressure. This provides crucial safety parameters and operational status feedback for the system.

[0060] In another embodiment of this utility model, a bend 17 is provided at the lower drain outlet, and a detachable flange 18 is provided between the bend 17 and the lower drain pipe 7. The bend 17 can change the direction of liquid flow, thereby reducing turbulence and impact force during drainage and preventing liquid from directly scouring the pipe or container. The detachable flange 18 is connected between the bend 17 and the lower drain pipe 7 and is sealed by bolts, enabling quick assembly and disassembly of the bend 17 and the tank 1. When it is necessary to clean the solid particles and sludge deposited at the bottom of the lower storage chamber 2 or to inspect the drain pipe, the bend 17 can be separated by removing the flange, directly exposing the interior of the lower drain pipe 7, facilitating manual cleaning or mechanical unblocking, further reducing the accumulation of impurities at the drain outlet and lowering the risk of blockage. In addition, the detachable flange 18 of this utility model eliminates the need for cutting pipes or disassembling the entire tank 1 during cleaning operations, making maintenance convenient and highly practical.

[0061] In another embodiment of this utility model, a level gauge 19 is also provided on the side wall of the lower liquid storage chamber 2. The level gauge 19 in this utility model is mainly used to monitor the liquid level of the lower liquid storage chamber 2 in real time, detect blockages in the drain outlet or malfunctions of the drain pump in advance, and prevent equipment damage or safety accidents caused by uncontrolled liquid levels. At the same time, it prevents liquid from flowing back into the airflow distributor 10 due to excessively high liquid levels or affecting gravity separation efficiency due to excessively low liquid levels, ensuring stable system operation. The level gauge 19 in this utility model is a common type of level gauge in the prior art, such as a hydrostatic type, a magnetic float type, or an ultrasonic type. The specific type selected depends on actual needs, as long as it can achieve the corresponding function. This utility model preferably uses a magnetic float type level gauge, where the float rises and falls with the liquid level, driving the magnetic float to flip, which can intuitively display the liquid level scale.

[0062] This utility model connects to the corresponding device through the first differential pressure gauge interface 14, the second differential pressure gauge interface 15, and the pressure gauge interface 16, and works in conjunction with the liquid level gauge 19 to achieve comprehensive monitoring of the filter element status, liquid level height, and system pressure, effectively improving the operational stability and maintenance efficiency of the system.

[0063] In another embodiment of this utility model, a cover 20 is also provided on the top of the tank 1. The cover 20 is sealed to the top of the tank 1 by bolts or a quick-opening structure, providing an access for inspection, cleaning, and replacement of internal components. During use, a sealing ring is provided on the contact surface between the cover 20 and the tank 1 to ensure sealing under pressure. After opening the cover 20, the condition of internal components such as the coalescing filter element 4 and the airflow distributor 10 can be visually inspected, or replacement or cleaning operations can be performed.

[0064] The working process of this utility model system is as follows: Raw material gas enters the tank 1 at high speed through the inlet 8. To avoid direct impact and uneven flow, the inlet 8 is connected to the airflow distributor 10 via an extension pipe 11 to ensure stable and directional airflow. The airflow distributor 10 disperses the high-speed airflow into multiple low-speed, uniform fine streams, forcing the airflow vertically downwards into the tank 1, thereby reducing disturbance to the settled liquid in the lower storage chamber 2 and preventing secondary atomization of the liquid. A baffle plate 13 installed in the lower storage chamber 2 further isolates the settled liquid from the airflow above, preventing the liquid from being re-entrained. Simultaneously, the coalescing separation plate 12 reduces the amount of residual micro-droplets in the gas through physical interception and coalescence. The gas undergoes initial gravity settling in the lower storage chamber 2, with large droplets and some impurities falling to the bottom of the lower storage chamber 2 and periodically discharged through the lower drain pipe 7. Gas flows upward through the coalescing filter element 4, where solid particulate impurities are trapped inside. Small droplets are coalesced into larger droplets, which fall into the upper storage chamber 3 under gravity. The filter element outlet pipe 5 elevates the filter element, preventing liquid from submerging the bottom. An upper drain port is located at the bottom of the upper storage chamber 3, connected to an external drainage system via an upper drain pipe 6 to periodically discharge the collected liquid. The system monitors the pressure difference between the two storage chambers in real time via a first differential pressure gauge interface 14 and a second differential pressure gauge interface 15 to determine the working status of the coalescing filter element 4. When the differential pressure exceeds a threshold, an alarm is triggered, and the filter element is replaced. A pressure gauge interface 16 is located on the side wall of the upper storage chamber 3, connected to an external pressure gauge to monitor the gas pressure inside the upper storage chamber 3 in real time, reflecting the pressure status after the filter element. The pretreated gas is discharged from the gas outlet 9 on the side wall of the upper storage chamber 3 and enters the next process of the molecular sieve dewatering skid.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An air intake pretreatment system for a molecular sieve dehydration skid, characterized in that, include: The tank body (1) has an inner cavity divided into a lower liquid storage chamber (2) and an upper liquid storage chamber (3). The upper liquid storage chamber (3) is equipped with a coalescing filter element (4). The tank body (1) also includes a filter element outlet pipe (5), an upper drain port, and a lower drain port. The filter element outlet pipe (5) is located under the mounting support of the coalescing filter element (4) to raise the filter element and leave a liquid storage space at the bottom of the filter element; The upper drain port is located at the bottom of the upper liquid storage chamber (3) and is connected to the external sewage system through the upper drain pipe (6) for draining the liquid in the upper liquid storage chamber (3); The lower drain port is located at the bottom of the lower storage chamber (2) and is connected to the external sewage system through the lower drain pipe (7) for draining the liquid in the lower storage chamber (2); The tank body (1) of the lower liquid storage chamber (2) and the upper liquid storage chamber (3) are respectively provided with an air inlet (8) and an air outlet (9).

2. The air intake pretreatment system for the molecular sieve dehydration skid according to claim 1, characterized in that, It also includes an airflow distributor (10) and an extension pipe (11) installed in the lower liquid storage chamber (2), and the airflow distributor (10) is connected to the air inlet (8) through the extension pipe (11).

3. The air intake pretreatment system for the molecular sieve dehydration skid according to claim 2, characterized in that, It also includes a coalescing separation plate (12) disposed in the lower liquid storage chamber (2), and the coalescing separation plate (12) is located above the airflow distributor (10).

4. The air intake pretreatment system for the molecular sieve dehydration skid according to claim 2 or 3, characterized in that, It also includes a baffle plate (13) disposed in the lower liquid storage chamber (2), and a coalescing separation plate (12) located below the airflow distributor (10).

5. The air intake pretreatment system for molecular sieve dehydration skids according to claim 1, 2, or 3, characterized in that, It also includes a first differential pressure gauge interface (14) and a second differential pressure gauge interface (15) respectively opened on the side walls of the lower liquid storage chamber (2) and the upper liquid storage chamber (3).

6. The air intake pretreatment system for the molecular sieve dehydration skid according to claim 4, characterized in that, It also includes a first differential pressure gauge interface (14) and a second differential pressure gauge interface (15) respectively opened on the side walls of the lower liquid storage chamber (2) and the upper liquid storage chamber (3).

7. The air intake pretreatment system for a molecular sieve dehydration skid according to claim 1, 2, 3 or 6, characterized in that, It also includes a pressure gauge interface (16) located on the side wall of the upper liquid storage chamber (3).

8. The air intake pretreatment system for a molecular sieve dehydration skid according to claim 1, 2, 3 or 6, characterized in that, A bend (17) is provided at the lower drain outlet, and a detachable flange (18) is provided between the bend (17) and the lower drain outlet of the lower drain pipe (7).

9. The air intake pretreatment system for a molecular sieve dehydration skid according to claim 1, 2, 3 or 6, characterized in that, A level gauge (19) is also provided on the side wall of the lower liquid storage chamber (2).

10. The air intake pretreatment system for a molecular sieve dehydration skid according to claim 1, 2, 3 or 6, characterized in that, The tank (1) is also equipped with a cover (20) on top.

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