A sound field assisted coalescence separation filter element

Abstract

The present invention discloses an acoustic field-assisted coalescence separation filter element, comprising an inner sound-generating component and an outer coalescence component; the inner sound-generating component comprises a flow-equalizing orifice plate, a plurality of Hartmann-type pneumatic sound sources, and a T-shaped diversion structure; the flow-equalizing orifice plate is connected to the bottom of the T-shaped diversion structure, and the top of the T-shaped diversion structure is connected to the corresponding Hartmann-type pneumatic sound source through a plurality of sound source guide tubes; each Hartmann-type pneumatic sound source comprises an air guide structure and a resonant cavity; the air inlet size, resonant cavity size, and resonant cavity-nozzle spacing size of each Hartmann-type pneumatic sound source are all different, which meet the requirements of sequential enhancement of sound wave frequency and sound pressure level from bottom to top. The present invention utilizes the acoustic wave agglomeration effect to agglomerate submicron-sized droplets in the gas into larger droplets, and at the same time, drives the gas to vibrate through the sound source, accelerates the flow of liquid on the surface of the filter element, reduces secondary entrainment, and improves the overall filtration efficiency of the filter element.

Description

Technical Field

[0001] The invention relates to the technical field of coalescence and separation, and in particular to an acoustic field assisted coalescence and separation filter element. Background Art

[0002] There is a certain distance between the main consumption areas and production areas of natural gas, and the gas consumption fluctuates greatly with the seasons. At the same time, due to the limited peak-shaving capacity of natural gas fields on the supply side and the relatively passive peak-shaving measures on the demand side, the supply and demand peak-shaving cannot make up for the supply and demand gap in time and space. Therefore, the importance of gas storage peak-shaving in natural gas peak-shaving is becoming increasingly prominent, and gas storage is a key link in achieving gas storage peak-shaving.

[0003] To inject natural gas underground, it must be pressurized, and the core power equipment used is the compressor. However, the natural gas entering the gas storage facility from the pipeline network often carries with it impurities such as debris, water, and condensate, which have been dislodged from pipeline corrosion. If solid particles or liquid droplets enter the compressor, they can cause wear, corrosion, or thermal strain on the blades and dry gas seals, leading to compressor shutdown in severe cases.

[0004] To ensure long-term continuous operation of the compressor, natural gas entering the gas storage facility typically passes through cyclones, filter separators, and coalescers to remove solid and liquid impurities entrained within the gas. Coalescers are primarily used to remove droplets smaller than 1 μm, and their core component is the coalescing filter element. Liquid-laden gas enters the filter element through the micropores of the filter material on the inner surface of the coalescing filter element. The droplets in the gas are intercepted by the fibers within the filter element. The droplets then collide and coalesce on the fibers, forming larger droplets within the filter material. The coalesced droplets then move with the airflow toward the outside of the filter element, where they are finally discharged under the influence of gas drag and gravity on the outer surface of the filter element. Clean gas is discharged from the outside of the filter element into the clean gas side, where it enters the subsequent process through the coalescer outlet.

[0005] like Figure 1The figure shows a schematic diagram of the coalescer structure used in the prior art. The tube sheet divides the coalescer into two sections: the lower section for the liquid gas side and the upper section for the clean gas side. Gas containing liquid droplets enters the coalescer through the inlet and reaches the liquid gas side. Driven by the gas, the gas reaches the filter elements. The gas enters the coalescing filter element through the pores in the filter material on the inner surface of the coalescing filter element. After coalescing, the liquid droplets are discharged from the outside of the coalescing filter element as a liquid. The discharged liquid falls to the tube sheet under the influence of gravity and then exits the coalescer through the clean gas side drain port. The clean gas is discharged from the outside of the coalescing filter element and enters the subsequent process through the coalescer outlet. If the liquid content of the gas is too high, some of the liquid will be directly intercepted on the inner surface of the coalescing filter element. Gravity then causes the liquid to fall to the bottom of the liquid gas side and exit the coalescer through the liquid gas side drain port. In actual use, coalescing filter elements are placed vertically. Studies have shown that captured liquid is unevenly distributed along the longitudinal direction of the filter element. The closer to the bottom of the filter element, the more severe the liquid blockage within the filter media. The liquid film on the filter element surface flows slowly under the action of gravity, exiting the filter element at a slower rate and settling at the bottom of the filter element. This causes secondary entrainment of droplets under the influence of airflow drag, seriously affecting the filter element's filtration performance. Furthermore, when a large amount of liquid appears within the filter media at the bottom of the filter element, capillary action increases the liquid content of the filter media adjacent to the bottom, further reducing the fiber's ability to intercept droplets and resulting in reduced filtration efficiency.

[0006] like Figure 2 The figure shows a schematic diagram of the structure of the coalescing filter element used in the prior art. The filter element is supported by an inner support frame, with the coalescing layer filter material wound on its outer side, and then the coalescing layer filter material is fastened by the outer support frame, and the drainage layer filter material is further wound on the outer side of the outer support frame. The lower end cover of the filter element and the upper end cover of the filter element are used to seal the inner and outer support frames and the ends of the coalescing layer and drainage layer filter materials, so that the liquid and dust-containing gas can only pass through the filter element radially. If the coalescing layer filter material in the coalescing filter element is made of multiple layers of high-precision fiber material tightly wound or folded, due to the limitation of the pore size of the filter material, the existing filter element is still insufficient in its ability to capture small-sized submicron particles. During the coalescing filtration process, some submicron droplets (below 0.3μm) often escape into the downstream. In the gas storage, these small droplets will be deposited in the air cooler, affecting the performance of the air cooler. At the same time, some liquid will re-enter the natural gas, affecting the normal operation of various downstream equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide an acoustic field-assisted coalescence separation filter element, which utilizes the acoustic wave agglomeration effect to agglomerate submicron droplets in the gas into larger droplets. At the same time, the sound source drives the gas to vibrate, accelerates the flow of liquid on the surface of the filter element, reduces secondary entrainment, and improves the overall filtration efficiency of the filter element.

[0008] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: an acoustic field assisted coalescence separation filter element, comprising an inner sound-generating component and an outer coalescence component;

[0009] The inner sound-generating component includes a flow-equalizing orifice plate, a plurality of Hartmann-type pneumatic sound sources, and a T-shaped flow-dividing structure. The flow-equalizing orifice plate is connected to the bottom of the T-shaped flow-dividing structure, and the top of the T-shaped flow-dividing structure is connected to the corresponding Hartmann-type pneumatic sound source through a plurality of sound source guide tubes.

[0010] Each Hartmann-type aerodynamic sound source includes an air guide structure and a resonant cavity. The air guide structure has an air inlet at the bottom and an annular nozzle at the top. A central rod stabilizer in the resonant cavity extends from the annular nozzle into the air guide structure.

[0011] The air inlet size, resonance cavity size, and the distance between the resonance cavity and the nozzle of each Hartmann-type aerodynamic sound source are different, which meets the requirements of increasing the sound wave frequency and sound pressure level from bottom to top.

[0012] Furthermore, using the backflow mode of the Hartmann type aerodynamic sound source, the subsonic airflow is compressed by the annular nozzle and accelerated to supersonic speed. The supersonic airflow is injected into the resonant cavity, generating a series of compression waves in the cavity and transmitting to the bottom of the cavity. The pressure in the cavity increases, and after colliding with the wall of the cavity bottom, it is reflected to the cavity mouth, forming an expansion wave at the cavity mouth and propagating into the cavity. The expansion wave is also reflected at the bottom of the cavity to the cavity mouth, and the pressure in the cavity decreases at this time; the change in the pressure in the cavity will cause the change in the direction of the gas inflow. When the pressure in the cavity increases, the jet direction turns to the outside of the cavity. When the pressure in the cavity decreases, the jet direction turns back to the cavity. This process is cyclical, and the generation of compression waves and expansion waves causes the surrounding air to vibrate periodically, thereby producing sound. The sound frequency and sound field intensity of the Hartmann type aerodynamic sound source are mainly related to the air intake volume, the size of the resonant cavity, and the distance between the nozzle and the resonant cavity.

[0013] Furthermore, a plurality of flow balancing holes are distributed on the flow balancing orifice plate, each flow balancing hole has a gradually converging and expanding flow channel, and a flow area adjustment mechanism is provided in the gradually converging and expanding flow channel.

[0014] Furthermore, the flow area adjustment mechanism includes a tapered plug and a spring, one end of the spring is connected to the tapered plug, and the other end is connected to the fixed beam.

[0015] Furthermore, the T-shaped flow diversion structure includes an annular flow guide channel and an annular buffer cavity, part of the flow equalizing holes are connected to the annular buffer cavity through the annular flow guide channel, and the annular buffer cavity is connected to multiple sound source flow guide tubes.

[0016] Furthermore, an O-ring groove is provided in the central mounting hole of the flow balancing orifice plate, which is connected with the filter element pressing device.

[0017] Furthermore, the inner sound-generating component and the outer agglomerating component are connected by welding through a supporting orifice plate, and each Hartmann-type pneumatic sound source is installed in a reserved hole on the supporting orifice plate.

[0018] Furthermore, the multiple Hartmann-type aerodynamic sound sources include a first aerodynamic sound source, a second aerodynamic sound source, and a third aerodynamic sound source, which are respectively installed on the first support orifice plate, the second support orifice plate, and the third support orifice plate, and the flow equalizing orifice plate is located below the first support orifice plate.

[0019] Furthermore, during actual operation, high-pressure natural gas enters the filter element. After a certain distance of buffering, the airflow tends to be uniform. Then, part of the natural gas passes through the T-shaped diversion structure and enters the guide tube of the three pneumatic sound sources, driving the sound source to make sound and then enter the internal space of the filter element. The other part of the natural gas directly enters the internal space of the filter element.

[0020] Furthermore, the distance between the first support orifice plate and the second support orifice plate, and the distance between the second support orifice plate and the third support orifice plate are 1 / 3 of the total length of the filter element.

[0021] Furthermore, the outer coalescing component includes a cylindrical structure with an upper end cover and a lower end cover, and the cylindrical structure includes a filter layer inner support frame, a coalescing layer filter material, a drainage layer filter material, and a filter layer outer support frame arranged in sequence from the inside to the outside.

[0022] Furthermore, the filter material of the coalescence layer is a high-precision filter material with an average pore size of 1 to 3 μm; the filter material of the drainage layer is a liquid-phobic filter material with an average pore size of 20 to 40 μm.

[0023] Furthermore, high-pressure natural gas enters the first aerodynamic sound source to generate high-frequency, high-sound pressure-level sound waves and form a sound field within a certain range. Under the influence of the sound wave agglomeration effect, the liquid particles in the airflow collide with each other to form larger particles. As the airflow moves upward, the second aerodynamic sound source generates a sound field slightly stronger than the first aerodynamic sound source, further agglomerating the liquid particles inside the sound field. The third aerodynamic sound source has a larger air inlet and a shorter distance between the resonant cavity and the nozzle, generating a sound field stronger than the first and second aerodynamic sound sources, agglomerating most of the submicron particles still existing in the airflow, increasing the diameter of the particles in the airflow and reducing the number of particles in the airflow. Subsequently, the airflow passes through the agglomeration layer filter material. At this time, the particle size of the particles in the airflow will increase and the number of submicron droplets will decrease.

[0024] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0025] 1) Based on the structure of a traditional coalescing filter element, the present invention sets a plurality of Hartmann-type pneumatic sound sources in the inner cavity of the filter element, dividing the filter element into two parts: an inner sound-generating component and an outer coalescing component. The inner sound-generating component mainly plays the role of agglomerating submicron particles in the incoming flow, and emits high-frequency sound waves with a frequency of 3 to 8 kHz after ventilation, which can obtain an agglomeration efficiency of about 65%, thereby reducing the number of submicron particles in the airflow and increasing the average pore size of liquid particles in the airflow. In this way, the outer coalescing component can more efficiently remove droplets in the airflow, effectively reduce the escape amount of droplets, and improve the filtration efficiency of the filter element.

[0026] 2) The present invention sets three Hartmann-type aerodynamic sound sources with different structural parameters from top to bottom inside the filter element, forming a gradient distribution in which the sound field intensity gradually decreases from top to bottom in the length direction of the filter element. The sound field generated by the Hartmann-type aerodynamic sound source has a good agglomeration effect on the droplets in the airflow. The periodic vibration of the gas generated by it will act on the liquid film on the surface of the filter element, increase the fluidity of the liquid film on the surface of the filter element, and be more conducive to the discharge of the liquid from the filter element. Therefore, the high-intensity sound field in the upper middle part of the filter element promotes the flow of liquid, promotes the discharge of liquid from the filter element under the combined action of the airflow drag, and promotes the flow of liquid to the lower part of the filter element under the combined action of gravity. The low-intensity sound field in the lower part of the filter element can promote the flow of liquid inside the filter element and on the outer surface of the filter element while avoiding destroying the liquid film, thereby alleviating the blockage of liquid inside the filter material to a certain extent, reducing the thickness of the liquid film at the bottom of the filter element, reducing the occurrence of secondary entrainment of droplets, and reducing the pressure drop of the filter element and the energy consumption of system operation to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a coalescer used in the prior art;

[0028] Figure 2 It is a schematic diagram of the structure of the coalescing filter element used in the prior art;

[0029] Figure 3 This is a schematic diagram of the structure of the coalescing filter element of the present invention;

[0030] Figure 4 Schematic diagram of the upper end cover and the lower end cover structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the diversion structure of the present invention;

[0032] Figure 6 This is a cross-sectional view of the Hartmann type aerodynamic sound source of the present invention;

[0033] Figure 7 Schematic diagram of the supporting orifice plate of the present invention.

[0034] Explanation of the numbers in the figure: 101-upper end cover, 102-drainage layer filter material, 103-filter layer outer support frame, 104-coalescing layer filter material, 105-filter layer inner support frame, 106-third support orifice plate, 107-third pneumatic sound source, 108-second support orifice plate, 109-second pneumatic sound source, 110-first support orifice plate, 111-first pneumatic sound source, 112-flow balancing orifice plate, 113-lower end cover, 114-T-type diversion structure, 115-sound source guide pipe;

[0035] 1121-gradually converging and diverging flow channel, 1122-conical plug, 1123-spring, 1141-annular buffer chamber, 1142-annular guide chamber;

[0036] 1071-first air inlet, 1072-first center rod stabilizer, 1073-first annular nozzle, 1074-first resonant cavity, 1091-second air inlet, 1092-second center rod stabilizer, 1093-second annular nozzle, 1094-second resonant cavity, 1111-third air inlet, 1112-third center rod stabilizer, 1113-third annular nozzle, 1114-third resonant cavity. DETAILED DESCRIPTION

[0037] The principles of the present disclosure will be described below with reference to several exemplary embodiments shown in the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the specification of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0042] In the description of this application, the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0043] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, or electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0044] The terms "first", "second", "third", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0045] Since the natural gas entering the gas storage from the gas pipeline network will contain liquid impurities, filter separators and coalescers will be installed in the gas storage in sequence to remove micron-sized and submicron-sized droplets in the natural gas respectively to ensure the safe operation of the compressor unit.

[0046] The coalescing filter element is the core component of the coalescer. It is a porous fiber medium. Its main function is to intercept small droplets in the liquid gas, and then make the small droplets collide with each other continuously inside the fiber to grow into large droplets. Finally, the droplets are discharged from the filter element under the action of gas drag and gravity on the exhaust side of the filter element, realizing gas-liquid separation.

[0047] When the liquid concentration in the incoming gas of the existing coalescing filter is relatively high and the particle size is relatively small, most of the particles smaller than the filter material pore size will escape to the downstream of the filter element due to the limitation of the pore size of the coalescing filter material. At the same time, the captured liquid cannot be discharged in time by the drag of the airflow and gravity alone, resulting in a decrease in filtration efficiency. After the liquid film forms on the exhaust side surface of the high-precision coalescing layer filter material, it slowly flows to the bottom of the filter element under the action of gravity. The slow flow rate causes a substantial increase in the pressure drop of the filter element and a significant increase in system energy consumption. The amount of liquid accumulated in the filter material at the bottom of the filter element is large. When the airflow passes through, the captured liquid will re-enter the downstream of the filter element. At the same time, the capillary action will cause the amount of liquid in the adjacent filter material to increase. The above situation is particularly prevalent at gas storage sites where the liquid concentration in the incoming gas is high and the particle size is relatively small. When the operating conditions fluctuate or the content of submicron droplets in the upstream incoming gas suddenly increases, the filter element efficiency will decrease and the system energy consumption will increase. Currently, the coalescing layer within coalescing filter elements is composed of multiple layers of high-precision fiber material (average pore size of approximately 1 to 3 μm). When captured liquid migrates to its outer surface, a liquid film forms, blocking the filter material pores and causing a sudden increase in the filter element's pressure drop. Research has shown that the pressure drop caused by the liquid film is primarily affected by capillary action and is closely related to the pore size of the fiber filter material. The smaller the fiber pore size, the more significant the increase in pressure drop. Furthermore, when currently used coalescing filter elements are placed vertically, the closer to the bottom of the element, the more severe the liquid blockage within the filter material, resulting in severe secondary entrainment of liquid droplets when air flows through.

[0048] The present invention improves the traditional filter element by setting a plurality of Hartmann-type micro-pneumatic sound sources from top to bottom at multiple different positions within the filter element frame. In this embodiment, three are used for illustration, so that the sound field can completely cover the filter element. By utilizing the acoustic agglomeration effect, liquid particles collide with each other in the sound field and agglomerate to form particles with larger particle size, thereby greatly reducing the number of aerosol particles. This greatly reduces the number of small-particle liquid particles, making up for the relatively insufficient capture ability of existing filter elements for submicron-sized small-particle droplets. At the same time, the vibration of the gas driven by the sound source can promote the flow of the liquid film on the surface of the filter element, thereby effectively improving the overall filtering capacity of the filter element.

[0049] The terms involved in the present invention are now explained: The coalescer is a filtering device used to remove fine droplets (below 1 micron) in the gas, and its core component is the coalescing filter element. Coalescing is the process in which tiny droplets in the gas form larger droplets due to collision, coalescence, and fusion inside the filter material. The coalescing layer is a multi-layer fiber filter material in the filter element that can achieve droplet coalescence. It is usually composed of glass fiber and is located on the inside of the filter element. The drainage layer is a single-layer fiber filter material in the filter element used to discharge the coalesced liquid. It can intercept large droplets caused by secondary entrainment of the coalescing layer. It is usually composed of polymer fibers such as aramid and is located on the outside of the filter element. Acoustic agglomeration refers to the process in which aerosol particles collide with each other under the continuous action of a high-intensity sound field, causing the average particle size of the aerosol to increase rapidly in a short period of time, significantly reducing the number concentration of the aerosol. Secondary entrainment of droplets is the process in which droplets separate from the gas phase and re-enter the gas phase under the action of airflow.

[0050] The Hartmann type aerodynamic sound source is a high-intensity sound source driven by high-pressure gas. There are three modes when making sounds: unstable mode, backflow mode and screaming mode. The present invention utilizes the backflow mode of the Hartmann type aerodynamic sound source. After the subsonic airflow is compressed by the annular nozzle, it is accelerated to supersonic speed. The supersonic airflow is injected into the resonant cavity, generating a series of compression waves in the cavity and transmitting to the bottom of the cavity. The pressure in the cavity increases, and after colliding with the wall of the bottom of the cavity, it is reflected to the cavity mouth. An expansion wave is formed at the cavity mouth and propagates into the cavity. The expansion wave is also reflected at the bottom of the cavity to the cavity mouth. At this time, the pressure in the cavity decreases. The change in the pressure in the cavity will cause the change in the direction of the gas inflow. When the pressure in the cavity increases, the jet direction turns to the outside of the cavity. When the pressure in the cavity decreases, the jet direction turns back to the cavity. This process is cyclical, and the compression wave and expansion wave cause the surrounding air to vibrate periodically, thereby making sounds. The sound frequency and sound field intensity of the Hartmann type aerodynamic sound source are mainly related to the air intake, the size of the resonant cavity, and the distance between the nozzle and the resonant cavity. The specific form is as follows: Figure 3-4 As shown, the filter element includes an inner sound-generating component and an outer coalescing component. The two components can be connected by welding through a supporting orifice plate. Three Hartmann-type pneumatic sound sources are installed in the reserved holes on the corresponding supporting orifice plates and fixed by welding.

[0051] The inner sound-generating components include a flow-equalizing orifice plate 112, a first support orifice plate 110, a first aerodynamic sound source 111, a second support orifice plate 108, a second aerodynamic sound source 109, a third support orifice plate 106, a third aerodynamic sound source 107, and a sound source guide tube. These three inner aerodynamic sound sources differ in their inlet size, resonant cavity size, and the distance between the resonant cavity and the nozzle, ensuring that the frequency and sound pressure level increase from bottom to top.

[0052] like Figure 5As shown, there are a total of several equal flow holes (such as 150) distributed on the equal flow orifice plate 112, each of which has a gradually converging and expanding flow channel 1121. A flow area adjustment mechanism is provided in the gradually converging and expanding flow channel 1121. The flow area adjustment mechanism includes a conical plug 1122 and a spring 1123, which can affect the flow area in real time. When the airflow is unevenly distributed, the resistance in each equal flow hole is changed in real time and made to converge, so as to achieve uniform air volume in each equal flow hole. An annular guide channel 1142 is used to connect 30 of the equal flow holes to the annular buffer cavity 1141, and its total area accounts for 20% of the flow area of ​​the equal flow orifice plate. An O-ring groove is provided in the central mounting hole of the equal flow orifice plate 112, which can cooperate with the filter element clamping device to ensure the airtightness of the center hole, so that the airflow passes only through the equal flow holes in the annular area.

[0053] Preferably, the inner diameter of the airflow inlet of the first type of aerodynamic sound source 111 can be 42 mm, the inner diameter of the resonance cavity can be 30 mm, and the distance between the nozzle and the resonance cavity can be 10 mm; the inner diameter of the airflow inlet of the second aerodynamic sound source 109 can be 46 mm, the inner diameter of the resonance cavity can be 34 mm, and the distance between the nozzle and the resonance cavity can be 8 mm; the inner diameter of the airflow inlet of the third aerodynamic sound source 107 can be 48 mm, the inner diameter of the resonance cavity can be 34 mm, and the distance between the nozzle and the resonance cavity can be 6 mm.

[0054] like Figure 6 As shown, the inner orifice plates each have three sound source mounting holes of different sizes. The first, second, and third pneumatic sound sources are mounted on the first, second, and third support orifice plates, respectively. The inner orifice plates are installed at fixed intervals within the filter element. The spacing between the flow balancing orifice plate 112 and the filter element bottom surface can be 50mm, and the spacing between the flow balancing orifice plate 112 and the first orifice plate 110 can be 120mm. The spacing between the first, second, second, and third support orifice plates is 1 / 3 of the total length of the filter element. Specifically, the first aerodynamic sound source includes a first air inlet 1071, a first center rod stabilizer 1072, a first annular nozzle 1073, and a first resonance cavity 1074; the second aerodynamic sound source includes a second air inlet 1091, a second center rod stabilizer 1092, a second annular nozzle 1093, and a second resonance cavity 1094; the third aerodynamic sound source includes a third air inlet 1111, a third center rod stabilizer 1112, a third annular nozzle 1113, and a third resonance cavity 1114.

[0055] The outer coalescing component includes an inner filter support frame 105, coalescing layer filter material 104, drainage layer filter material 102, and an outer filter support frame 103. The inner coalescing layer filter material 104 of the outer coalescing component is a high-precision filter material with an average pore size preferably between 1 and 3 μm. The drainage layer filter material 102 is a lyophobic filter material with an average pore size preferably between 20 and 40 μm.

[0056] During actual operation, high-pressure natural gas enters the filter element. After a certain distance of buffering, the airflow tends to be uniform. Then, it passes through the diversion device. 20% of the natural gas enters the guide tube of three Hartmann-type pneumatic sound sources, drives the sound source to produce sound, and then enters the internal space of the filter element. 80% of the natural gas enters the internal space of the filter element directly. High-pressure natural gas enters the first aerodynamic sound source, generating high-frequency, high-sound-pressure-level sound waves and forming a sound field within a certain range. Under the influence of the sound wave agglomeration effect, the liquid particles in the airflow collide with each other to form larger particles. As the airflow moves upward, the second sound source generates a sound field slightly stronger than the first sound source, further agglomerating the liquid particles inside the sound field. At this time, the number of liquid particles carried in the gas is significantly reduced, but there are still some submicron small particles that are smaller than the minimum filtration accuracy of the filter element. Therefore, a third aerodynamic sound source is set on the upper part of the filter element. The third aerodynamic sound source has a larger air inlet and a shorter resonant cavity and nozzle distance. It can generate a sound field that is significantly stronger than the first and second aerodynamic sound sources, agglomerating most of the submicron particles still existing in the airflow, significantly increasing the diameter of the particles in the airflow and reducing the number of particles in the airflow. Subsequently, the airflow passes through the filter element agglomeration layer. At this time, the particle size of the airflow will be significantly increased and the number of submicron droplets will be significantly reduced, reducing the filtration load of the agglomeration layer while improving the filtration efficiency of the agglomeration layer.

[0057] The above description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that the present disclosure may be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

[0058] Although the claims in this application have been formulated with reference to particular combinations of features, it will be understood that the scope of the present disclosure also includes any novel feature or any novel combination of features disclosed herein, whether explicitly or implicitly or in any generalization thereof, whether or not it relates to the same arrangement in any claim currently claimed.

Claims

1. An acoustic field assisted coalescence separation filter element, characterized in that: It includes an inner sound-generating component and an outer coalescing component; The inner sound-generating component includes a flow-equalizing orifice plate, a plurality of Hartmann-type pneumatic sound sources, and a T-shaped flow-dividing structure. The flow-equalizing orifice plate is connected to the bottom of the T-shaped flow-dividing structure, and the top of the T-shaped flow-dividing structure is connected to the corresponding Hartmann-type pneumatic sound source through a plurality of sound source guide tubes. Each Hartmann-type aerodynamic sound source includes an air guide structure and a resonant cavity. The air guide structure has an air inlet at the bottom and an annular nozzle at the top. A central rod stabilizer in the resonant cavity extends from the annular nozzle into the air guide structure. Each Hartmann-type aerodynamic sound source has different inlet dimensions, resonance cavity dimensions, and spacing between the resonance cavity and the nozzle, which meet the requirement of increasing the sound wave frequency and sound pressure level from bottom to top. Multiple Hartmann-type micro-pneumatic sound sources are placed at different locations within the filter element frame from top to bottom, allowing the sound field to completely cover the filter element. Utilizing the backflow pattern of the Hartmann-type pneumatic sound source, The flow balancing orifice plate is provided with a plurality of flow balancing holes, each of which has a gradually converging and expanding flow channel, and a flow area regulating mechanism is provided in the gradually converging and expanding flow channel.

2. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: After the subsonic airflow is compressed by the annular nozzle, it is accelerated to supersonic speed. The supersonic airflow is injected into the resonant cavity, generating a series of compression waves in the cavity that are transmitted to the bottom of the cavity. The pressure in the cavity increases, and after colliding with the wall of the cavity bottom, it is reflected to the cavity mouth, forming an expansion wave at the cavity mouth that propagates into the cavity. The expansion wave is also reflected at the bottom of the cavity to the cavity mouth. At this time, the pressure in the cavity decreases; the change in the pressure in the cavity will cause the direction of the gas inflow to change. When the pressure in the cavity increases, the jet direction turns to the outside of the cavity. When the pressure in the cavity decreases, the jet direction turns back to the cavity. This process repeats continuously. The generation of compression waves and expansion waves causes the surrounding air to vibrate periodically, thereby producing sound.

3. The acoustic field assisted coalescence separation filter element according to claim 2, characterized in that: The flow area adjustment mechanism includes a tapered plug and a spring, one end of the spring is connected to the tapered plug, and the other end is connected to the fixed beam.

4. The acoustic field assisted coalescence separation filter element according to claim 2, characterized in that: The T-shaped flow diversion structure includes an annular flow guide channel and an annular buffer cavity. Some flow equalizing holes are connected to the annular buffer cavity through the annular flow guide channel, and the annular buffer cavity is connected to multiple sound source flow guide pipes.

5. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: An O-ring groove is provided in the central mounting hole of the flow balancing orifice plate and is connected with the filter element pressing device.

6. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: The inner sound-generating component and the outer agglomerating component are connected by welding through a supporting orifice plate, and each Hartmann-type pneumatic sound source is installed in a reserved hole on the supporting orifice plate.

7. The acoustic field assisted coalescence separation filter element according to claim 6, characterized in that: The multiple Hartmann-type aerodynamic sound sources include a first aerodynamic sound source, a second aerodynamic sound source, and a third aerodynamic sound source, which are respectively installed on the first supporting orifice plate, the second supporting orifice plate, and the third supporting orifice plate, and the flow equalizing orifice plate is located below the first supporting orifice plate.

8. The acoustic field assisted coalescence separation filter element according to claim 7, characterized in that: During actual operation, high-pressure natural gas enters the filter element. After a certain distance of buffering, the airflow tends to be uniform. Then, part of the natural gas passes through the T-shaped diversion structure and enters the guide pipe of the three pneumatic sound sources, driving the sound sources to make sounds and then entering the internal space of the filter element. The other part of the natural gas directly enters the internal space of the filter element.

9. The acoustic field assisted coalescence separation filter element according to claim 7, characterized in that: The distance between the first support orifice plate and the second support orifice plate, and the distance between the second support orifice plate and the third support orifice plate are 1 / 3 of the total length of the filter element.

10. The acoustic field assisted coalescence separation filter element according to claim 7, characterized in that: The outer coalescing component comprises a cylindrical structure with an upper end cover and a lower end cover, and the cylindrical structure comprises a filter layer inner support frame, a coalescing layer filter material, a drainage layer filter material, and a filter layer outer support frame which are sequentially arranged from the inside to the outside.

11. The acoustic field assisted coalescence separation filter element according to claim 10, characterized in that: The coalescence layer filter material is a high-precision filter material with an average pore size of 1-3 μm; the drainage layer filter material is a liquid-repellent filter material with an average pore size of 20-40 μm.

12. The acoustic field assisted coalescence separation filter element according to claim 10, characterized in that: High-pressure natural gas enters the first aerodynamic sound source, generating high-frequency, high-sound-pressure-level sound waves and forming a sound field within a certain range. Under the influence of the sound wave agglomeration effect, the liquid particles in the airflow collide with each other to form larger particles. As the airflow moves upward, the second aerodynamic sound source generates a sound field slightly stronger than the first aerodynamic sound source, further agglomerating the liquid particles inside the sound field. The third aerodynamic sound source has a larger air inlet and a shorter distance between the resonant cavity and the nozzle, generating a sound field stronger than the first and second aerodynamic sound sources, agglomerating most of the submicron particles still existing in the airflow, increasing the diameter of the particles in the airflow and reducing the number of particles in the airflow. Subsequently, the airflow passes through the coalescing layer filter material. At this time, the particle size of the airflow will increase and the number of submicron droplets will decrease.

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