Sound field auxiliary coalescence separation filter element

Abstract

The invention discloses a sound field auxiliary coalescence separation filter element which comprises an inner side sound production part and an outer side coalescence part. The inner side sound production part comprises a flow equalizing pore plate, a plurality of Hartmann type pneumatic sound sources and a T-shaped flow dividing structure, the flow equalizing pore plate is connected with the bottom of the T-shaped flow dividing structure, and the top of the T-shaped flow dividing structure is connected with the corresponding Hartmann type pneumatic sound sources through a plurality of sound source flow guide pipes; each Hartmann type pneumatic sound source comprises an air guide structure and a resonant cavity; the sizes of air inlets, the sizes of resonant cavities and the distances between the resonant cavities and the nozzles of all the Hartmann type pneumatic sound sources are different, and the requirement that the sound wave frequency and the sound pressure level are sequentially enhanced from bottom to top is met. According to the invention, submicron small liquid drops in gas are agglomerated into large liquid drops by utilizing an acoustic agglomeration effect, and meanwhile, the gas is driven to vibrate through a sound source, so that the flow of liquid on the surface of the filter element is accelerated, secondary entrainment is reduced, and the overall filtering efficiency of the filter element is improved.

Description

Technical Field

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

[0002] There is a certain distance between the main natural gas consumption areas and production areas, 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, 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] In order to inject natural gas into the ground, it is necessary to pressurize the natural gas, and the core power equipment used is the compressor. However, the natural gas entering the gas storage from the pipeline network will carry impurities such as debris, water, condensate oil, etc. that are detached from the pipeline due to corrosion to varying degrees. If solid particles or droplets enter the compressor, it will cause wear, corrosion or thermal strain of the blades or dry gas sealing system, and in severe cases, it will cause the compressor to shut down.

[0004] In order to ensure the long-term continuous operation of the compressor, the natural gas entering the gas storage generally passes through the cyclone separator, filter separator, coalescer and other devices in turn to remove the solid and liquid impurities entrained in the gas. The coalescer is mainly used to remove droplets below 1μm, and its core component is the coalescing filter element. The liquid-containing 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 in the filter element, and then the droplets collide and coalesce on the fibers to form larger droplets inside the filter material. The coalesced droplets move to the outside of the filter element with the air flow, and finally the droplets are discharged under the action of gas drag and gravity on the outer surface of the filter element. The clean gas is discharged from the outside of the filter element into the clean gas side, and enters the subsequent process through the outlet of the coalescer.

[0005] like Figure 1The figure shows a schematic diagram of the structure of the coalescer used in the prior art. The tube sheet divides the coalescer into two parts, the lower part is the liquid gas side, and the upper part is the clean gas side. The gas containing liquid droplets enters the liquid gas side of the coalescer from the coalescer inlet, and reaches each filter element under the driving force of the gas. The gas enters the coalescing filter element through the pores of the filter material on the inner surface of the coalescing filter element. After coalescence, the liquid droplets are discharged from the outside of the coalescing filter element in the form of liquid. The discharged liquid slides down to the tube sheet under the action of gravity, and then discharges 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. When the liquid content of the gas is too high, part of the liquid will be directly intercepted on the inner surface of the coalescing filter element, and then slide down to the bottom of the liquid gas side under the action of gravity, and discharge the coalescer through the liquid gas side drain port. In actual use, the coalescing filter element is placed vertically. Studies have shown that the captured liquid is unevenly distributed in the longitudinal direction of the filter element. The closer to the bottom of the filter element, the more serious the liquid blockage in the filter material. The liquid film on the surface of the filter element flows slowly under the action of gravity, and the speed of discharging the filter element is slow. It is deposited at the bottom of the filter element, and the secondary entrainment of droplets occurs under the action of airflow drag, which seriously affects the filtering effect of the filter element. At the same time, when a large amount of liquid appears inside the filter material at the bottom of the filter element, the capillary action will cause the liquid content of the filter material adjacent to the bottom to increase, further reducing the interception of droplets by the fiber, causing a decrease in 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, and the coalescing layer filter material is wound on the outside thereof, and then the coalescing layer filter material is fastened by an outer support frame, and the drainage layer filter material is further wound on the outside 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 formed by tightly winding or folding multiple layers of high-precision fiber materials, due to the limitation of the pore size of the filter material, the existing filter element is still insufficient in capturing small-size 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 enter the natural gas again, affecting the normal operation of 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, and at the same time drives the gas to vibrate through the sound source, thereby accelerating the flow of liquid on the surface of the filter element, reducing secondary entrainment, and improving the overall filtration efficiency of the filter element.

[0008] To achieve the above-mentioned purpose, the technical solution of the present application is: 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, wherein 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 pipes;

[0010] Each Hartmann-type pneumatic sound source includes an air guide structure and a resonance cavity, wherein the air guide structure has an air inlet at the bottom and an annular nozzle at the top, and a central rod stabilizer in the resonance 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 pneumatic 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 reflow mode of the Hartmann type aerodynamic sound source, the subsonic airflow is compressed by the annular nozzle and then 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, and 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, 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 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.

[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 conical plug and a spring, one end of the spring is connected to the conical 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 a plurality of 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 cooperated and connected with the filter element pressing device.

[0017] Furthermore, the inner sound-generating component and the outer coalescing 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 plurality of Hartmann-type pneumatic sound sources include a first pneumatic sound source, a second pneumatic sound source, and a third pneumatic 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.

[0019] Furthermore, during actual operation, high-pressure natural gas enters the filter element, and 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 source to make sound and then enters the internal space of the filter element, while the other part of the natural gas directly enters the internal space of the filter element.

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

[0021] Furthermore, the outer coalescing component comprises a cylindrical structure having 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.

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

[0023] Furthermore, high-pressure natural gas enters the first pneumatic 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 pneumatic sound source generates a sound field slightly stronger than the first pneumatic sound source, further agglomerating the liquid particles inside the sound field. The third pneumatic sound source has a larger air inlet and a shorter resonant cavity and nozzle spacing, generating a sound field stronger than the first and second pneumatic 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 coalescence layer filter material, at which time the particle size in the airflow will increase and the number of submicron droplets will decrease.

[0024] The present invention adopts the above technical solution, and 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, and divides 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 pneumatic 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 pneumatic sound source has a good agglomeration effect on the droplets in the airflow, and 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 and 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 the destruction of the liquid film, alleviate the blockage of the liquid inside the filter material to a certain extent, reduce the thickness of the liquid film at the bottom of the filter element, reduce the occurrence of secondary entrainment of droplets, and reduce the filter element pressure drop and system operation energy consumption 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 It is a schematic diagram of the structure of the coalescing filter element of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the upper end cover and the lower end cover of the present invention;

[0031] Figure 5 It is a schematic diagram of the shunt structure of the present invention;

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

[0033] Figure 7 It is a schematic diagram of the supporting orifice plate of the present invention.

[0034] Description of the serial numbers in the figure: 101-upper end cover, 102-liquid drainage layer filter material, 103-filter layer outer support frame, 104-coagulation 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 averaging orifice plate, 113-lower end cover, 114-T-type diversion structure, 115-sound source guide pipe;

[0035] 1121-gradually converging and expanding 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 resonance cavity, 1091-second air inlet, 1092-second center rod stabilizer, 1093-second annular nozzle, 1094-second resonance cavity, 1111-third air inlet, 1112-third center rod stabilizer, 1113-third annular nozzle, 1114-third resonance cavity. DETAILED DESCRIPTION

[0037] The principles of the present disclosure will be described below with reference to several example 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field 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, further definition and explanation thereof is not required in subsequent drawings.

[0041] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0042] In the description of the present 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 are the orientations or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to 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 agglomerators will be installed in the gas storage in sequence to remove micron-sized and submicron-sized droplets in the natural gas respectively, so as 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-containing gas, and then make the small droplets collide with each other continuously inside the fiber to grow and form large droplets. Finally, they 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 pore size of the filter material 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 is formed 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 significant 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, it will cause the captured liquid to enter the downstream of the filter element again. 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 present at the gas storage site 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. At present, the coalescing layer filter material in the coalescing filter element is a multi-layer high-precision fiber material (average pore size is about 1-3μm). When the captured liquid moves to its outer surface, a liquid film will be formed, blocking the pores of the filter material, causing a sudden increase in the pressure drop of the filter element. Studies have shown that the pressure drop caused by the liquid film is mainly 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 pressure drop increase; and the coalescing filter element currently used is placed vertically, the closer to the bottom of the filter element, the more serious the liquid blockage in the filter material, so that when the airflow passes through, it will cause serious secondary entrainment of droplets.

[0048] The present invention improves the traditional filter element, and sets a plurality of Hartmann-type micro-pneumatic sound sources from top to bottom at multiple different positions in the filter element frame. In this embodiment, three are used for illustration, so that the sound field can completely cover the filter element. The sound wave agglomeration effect is utilized to make 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, and makes up for the deficiency of the existing filter element in its ability to capture submicron 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 are formed into 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 pneumatic sound source is a high-intensity sound source driven by high-pressure gas. There are three modes when making sounds: unstable mode, reflow mode and screaming mode. The present invention utilizes the reflow mode of the Hartmann type pneumatic 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 the expansion wave cause the surrounding air to vibrate periodically, thereby making sounds. The sound frequency and sound field intensity of the Hartmann type pneumatic 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, and 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 supporting orifice plate 110, a first pneumatic sound source 111, a second supporting orifice plate 108, a second pneumatic sound source 109, a third supporting orifice plate 106, a third pneumatic sound source 107, and a sound source guide tube. The three inner pneumatic sound sources differ in the size of the air inlet, the size of the resonance cavity, and the distance between the resonance cavity and the nozzle, meeting the requirement of increasing the sound wave frequency and the sound pressure level 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, and 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, and change the resistance in each equal flow hole in real time and make it converge when the airflow is unevenly distributed, so as to achieve uniform air volume in each equal flow hole. An annular flow guide channel 1142 is used to connect 30 of the equal flow holes with 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 air tightness of the center hole, so that the airflow only passes through the equal flow holes in the annular area.

[0053] Preferably, the inner diameter of the airflow inlet of the first type of pneumatic 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 pneumatic 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 pneumatic 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, three sound source installation holes of different sizes are opened on the inner orifice plate, and the first, second and third pneumatic sound sources are installed on the first, second and third supporting orifice plates respectively. The inner orifice plate is installed at a fixed distance inside the filter element, wherein the distance between the flow averaging orifice plate 112 and the bottom surface of the filter element can be 50mm, the distance between the flow averaging orifice plate 112 and the first orifice plate 110 can be 120mm, and the distance between the first and second supporting orifice plates and the second and third supporting 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 a filter layer inner support frame 105, a coalescing layer filter material 104, a drainage layer filter material 102, and a filter layer outer support frame 103. The coalescing layer filter material 104 in the outer coalescing component is a high-precision filter material, and the average pore size is preferably 1 to 3 μm. The drainage layer filter material 102 is a liquid-repellent filter material, and the average pore size is preferably 20 to 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, and 20% of the natural gas enters the guide tube of three Hartmann-type pneumatic sound sources. After driving the sound source to make a sound, it enters the internal space of the filter element, and 80% of the natural gas directly enters the internal space of the filter element. High-pressure natural gas enters the first pneumatic 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 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 pneumatic sound source is set on the upper part of the filter element. The third pneumatic sound source has a larger air inlet and a shorter resonant cavity and nozzle spacing. It can produce a sound field that is significantly stronger than the first and second pneumatic 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 particles in 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 only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0058] Although the claims in this application have been formulated with respect to particular combinations of features, it should 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 scheme 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, wherein 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 pipes; Each Hartmann-type pneumatic sound source includes an air guide structure and a resonance cavity, wherein the air guide structure has an air inlet at the bottom and an annular nozzle at the top, and a central rod stabilizer in the resonance cavity extends from the annular nozzle into the air guide structure; The air inlet size, resonance cavity size, and the distance between the resonance cavity and the nozzle of each Hartmann-type pneumatic sound source are different, which meets the requirements of increasing the sound wave frequency and sound pressure level from bottom to top.

2. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: Utilizing the reflux mode of the Hartmann-type aerodynamic sound source, the subsonic airflow is compressed by the annular nozzle and then 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 cavity bottom, increasing the cavity pressure. After colliding with the cavity bottom wall, it is reflected to the cavity mouth, where an expansion wave is formed to propagate into the cavity. The expansion wave is also reflected at the cavity bottom to the cavity mouth, where the cavity pressure decreases. The change in cavity pressure will cause a change in the direction of gas inflow. When the cavity pressure increases, the jet direction turns to the outside of the cavity. When the cavity pressure 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.

3. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: 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 arranged in the gradually converging and expanding flow channel.

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

5. The acoustic field assisted coalescence separation filter element according to claim 3, characterized in that: 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 a plurality of sound source flow guide pipes.

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

7. The acoustic field assisted coalescence separation filter element according to claim 1, characterized in that: The inner sound-generating component and the outer coalescing 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.

8. The acoustic field assisted coalescence separation filter element according to claim 7, characterized in that: The multiple Hartmann type pneumatic sound sources include a first pneumatic sound source, a second pneumatic sound source, and a third pneumatic 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.

9. The acoustic field assisted coalescence separation filter element according to claim 8, 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 source to make sound and then enters the internal space of the filter element. The other part of the natural gas directly enters the internal space of the filter element.

10. The acoustic field assisted coalescence separation filter element according to claim 8, characterized in that: The distance between the first supporting orifice plate and the second supporting orifice plate, and the distance between the second supporting orifice plate and the third supporting orifice plate are 1 / 3 of the total length of the filter element.

11. The acoustic field assisted coalescence separation filter element according to claim 8, characterized in that: The outer coalescing component comprises a cylinder structure with an upper end cover and a lower end cover, and the cylinder 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.

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

13. The acoustic field assisted coalescence separation filter element according to claim 11, characterized in that: High-pressure natural gas enters the first pneumatic 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 pneumatic sound source generates a sound field slightly stronger than the first pneumatic sound source, further agglomerating the liquid particles inside the sound field. The third pneumatic sound source has a larger air inlet and a shorter resonant cavity and nozzle spacing, generating a sound field stronger than the first and second pneumatic 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 coalescence 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.

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