CN115212668A - Coalescence filter core and coalescence filter - Google Patents
Coalescence filter core and coalescence filter Download PDFInfo
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- CN115212668A CN115212668A CN202210162396.4A CN202210162396A CN115212668A CN 115212668 A CN115212668 A CN 115212668A CN 202210162396 A CN202210162396 A CN 202210162396A CN 115212668 A CN115212668 A CN 115212668A
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- 238000004581 coalescence Methods 0.000 title claims description 35
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- 238000011045 prefiltration Methods 0.000 claims description 5
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- 238000009826 distribution Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 33
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 48
- 239000003345 natural gas Substances 0.000 description 24
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
- B01D46/0031—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid with collecting, draining means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
- B01D46/64—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2265/06—Details of supporting structures for filtering material, e.g. cores
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a coalescing filter element and a coalescing filter, wherein the coalescing filter element comprises an upper end cover, a lower end cover, a supporting outer framework, a supporting inner framework and a filter element, the supporting outer framework and the supporting inner framework are cylindrical, through holes are distributed on the supporting outer framework and the supporting inner framework, the upper end cover and the lower end cover are horizontally arranged and vertically distributed at intervals, the supporting outer framework and the supporting inner framework are vertically arranged between the upper end cover and the lower end cover, the supporting inner framework is positioned in the supporting outer framework, two ends of the supporting inner framework and two ends of the supporting outer framework are respectively connected with the upper end cover and the lower end cover, the upper end cover, the lower end cover, the supporting outer framework and the supporting inner framework are jointly enclosed to form an annular installation cavity, a material port communicated with an inner hole of the supporting inner framework is arranged in the middle of the lower end cover, the filter element is filled in the installation cavity, and the filter element is used for filtering particulate components in gas, so that the gas is purified.
Description
Technical Field
The invention relates to the field of natural gas development, in particular to a coalescing filter element and a coalescing filter.
Background
As the production and demand of natural gas increases, more and more natural gas pipelines and gas stations along the way are built. These pipelines often contain many contaminants in the natural gas transportation process, which affect the safe operation of the natural gas pipelines and the gas station equipment, and therefore, the contaminants in the natural gas need to be purified to reduce the damage to the pipelines and equipment. The natural gas filter and the coalescer are used as mature natural gas purification equipment and widely applied to various large natural gas conveying pipelines, and the performance of the core element filter element directly influences the purification effect of the filter and the coalescer on natural gas.
Since contaminants can adversely affect natural gas pipelines and the station equipment and instrumentation along the pipeline. In order to ensure the normal production and operation of long-distance natural gas pipelines and equipment of a gas station along the way, a cyclone separator, a filtering separator (the filtering separator is mainly used for separating solid particles and liquid drops with the particle diameter larger than 1 mu m, and the structural types are divided into a horizontal type and a vertical type), a dry gas sealing filter, a gas filter and other equipment are usually installed in the gas station to purify natural gas. The natural gas entering the station passes through a cyclone and a filter in sequence and then enters the compressor for the most part. The pressure in the natural gas pipeline is very high, and the air velocity is very fast, so liquid impurity in the natural gas can cause erosion and wear to the natural gas pipeline inner wall under the effect of high-speed air current, and especially in weak links such as elbow, the condition that the erosion and wear became invalid is more serious, and impurity in the pipeline can block up the sampling mouth of pipeline or equipment instrument moreover for instrument measurement takes place the deviation or became invalid, causes the potential safety hazard. Impurities in the natural gas pipeline can cause erosive wear to the compressor and the gas turbine blade in the gas compression station, and in severe cases, the natural gas pipeline can vibrate and exceed the limit to be stopped. In addition, a large amount of liquid impurities exist in the high-pressure natural gas transportation process, and the liquid impurities can harm the operation safety of pipeline instruments and compressor units, so a corresponding filtering and separating device is needed to be arranged for purifying the natural gas, and in order to effectively remove liquid drops in the natural gas, a coalescing filter (a filtering device for removing fine liquid drops with the particle size of less than 1 μm in the gas, and the core part of the coalescing filter is a coalescing filter element) is the most commonly used method at present, and the natural gas coalescing filter has the following problems:
1. when the precision of the coalescing filter element is improved, the steady-state pressure drop in the filtering process of the coalescing filter element is also increased, so that the quality factor of the coalescing filter element is greatly reduced, and the energy consumption is increased;
2. the coalescence filter element has a secondary entrainment phenomenon (a process of separating liquid drops from a gas phase and then re-entering the gas phase under the action of gas flow), so that liquid drops with larger particle sizes appear at the downstream, and the filtering efficiency of the coalescence filter is influenced;
3. when the filtration process reaches a steady state, the coalescence filter element in the coalescence filter begins to discharge liquid, the liquid discharge speed of the coalescence filter liquid discharge device is slow, liquid is accumulated at the bottom, the accumulated liquid can soak the coalescence filter element to damage the filter material, and the coalescence filter element can lose efficacy when the liquid is serious, so that the performance and the service life of the coalescence filter element are influenced.
The problems can influence the normal operation of a long-distance natural gas pipeline and a gas station along the way, and can cause great economic loss when the problems are serious.
Disclosure of Invention
In order to solve the above technical problems, an objective of the present invention is to provide a coalescing filter element with a simple structure, which can significantly improve the filtering efficiency without increasing the pressure drop and greatly reduce the secondary entrainment phenomenon.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a coalescence filter core, includes upper end cover, lower extreme cover, supports outer skeleton, supports the inner frame and crosses the filter core, it is the cylindric to support outer skeleton and support the inner frame, just support outer skeleton and support the inner frame and be covered with the through-hole, upper end cover and the equal level setting of lower extreme cover interval distribution from top to bottom, support outer skeleton and support the equal vertical setting of inner frame and be in between upper end cover and the lower extreme cover, just it is located to support the inner frame support the outer skeleton, support the inner frame and support the both ends of outer skeleton respectively with upper end cover and lower end cover are connected, upper end cover, lower extreme cover, support outer skeleton and support the inner frame enclose jointly and close and form an annular installation cavity, the middle part of lower extreme cover be equipped with support the material mouth that the inner frame hole link up, it is in to cross the filter core packing the installation cavity.
The beneficial effects of the above technical scheme are that: so make gas enter into support the inner frame by the outside filter core of coalescence filter core after filtering, so filter gas by the filter core to carry out the filtering with the particulate composition in the gas, thereby purify gas.
In the technical scheme, the filter element is cylindrical, and the filter element sequentially comprises a cylindrical pre-filtering layer, a coalescing layer and a drainage layer from outside to inside.
The beneficial effects of the above technical scheme are that: thus, the gas is preliminarily filtered through the pre-filtering layer, then the pre-filtered gas is further filtered through the coalescence layer, and finally the liquid drops in the gas filtered through the coalescence layer are further intercepted through the liquid drainage layer.
In the technical scheme, the coalescence layer sequentially comprises a droplet capture layer, a hydrophilic layer and at least one lyophobic layer from outside to inside.
The beneficial effects of the above technical scheme are that: so make the drop catch layer carry out the preliminary entrapment to the drop in the gas, and the lyophilic layer is further with the drop absorption in the gas, and the lyophobic layer is kept apart the drop in the gas so that the hydrophilic layer absorbs to make the drop less in the gas after the filtration.
In the technical scheme, the outer wall of the aggregation layer is uniformly provided with fold-shaped bulges which are inclined towards the same direction along the circumferential direction of the aggregation layer.
The beneficial effects of the above technical scheme are that: this results in a larger filtration area for the coalescing layer.
Still include driving piece and whirl impeller among the above-mentioned technical scheme, arranging in of whirl impeller support the inner frame downthehole, just the pivot of whirl impeller vertically upwards extend to pass and wear out the top of upper end cover, and with the upper end cover rotates to be connected, the upper end of pivot with the driving piece transmission is connected, the driving piece is used for driving the whirl impeller is in support the inner frame internal rotation.
The beneficial effects of the above technical scheme are that: therefore, the rotational flow impeller enables the filtered gas to rotate at a high speed and scatter liquid drops in the gas to impact the supporting inner framework, and the liquid drops are gathered on the supporting inner framework and then deposited downwards.
In the above technical scheme, the driving part is a motor, and the driving part is installed at the upper end of the upper end cover.
The beneficial effects of the above technical scheme are that: the structure is simple.
In the technical scheme, the rotational flow impeller further comprises an impeller column and blades which are circumferentially and uniformly arranged on the side wall of the impeller column at intervals, and the lower end of the rotating shaft is fixedly connected with the upper shaft of the impeller column.
The beneficial effects of the above technical scheme are that: the liquid drop scattering device is simple in structure, the liquid drops are scattered through the blades, and the scattering effect is good.
The second purpose of the present invention is to provide a coalescing filter with excellent filtering effect.
In order to achieve the above object, another technical solution of the present invention is as follows: the utility model provides a coalescence filter, includes the casing and as above the coalescence filter core, the inside cavity of casing, the upper end of casing is equipped with the air inlet rather than inside intercommunication, the coalescence filter core is vertical to be installed the middle part of diapire in the casing, just correspond on the casing diapire the position department of material mouth be equipped with the gas outlet of material mouth intercommunication, the upper end of gas outlet upwards inwards extends to support in the inner frame, and be close to swirl impeller's lower extreme, the edge of casing diapire is equipped with the outage.
The beneficial effects of the above technical scheme are that: the gas filter is simple in structure, so that the gas is filtered by the coalescence filter element after entering the shell, and the intercepted granular components and liquid drops are deposited in the shell and discharged downwards.
In the technical scheme, the lower end edge of the shell is provided with an annular liquid collecting jacket in a downward protruding mode, drain holes communicated with the inside of the shell are evenly distributed in the upper end of the liquid collecting jacket, and the drain holes are formed in the lower end of the liquid collecting jacket.
The beneficial effects of the above technical scheme are that: therefore, the phenomenon that the filtering effect of the coalescing filter element is influenced by the deposition of liquid drops in the shell can be avoided.
Drawings
FIG. 1 is a schematic structural view of a coalescing filter element according to example 1 of the present invention;
FIG. 2 is a partial cross-sectional view of a filter element in accordance with example 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of a filter cartridge in example 1 of the present invention;
FIG. 4 is a schematic view of the structure of a coalescing layer in example 1 of the present invention;
FIG. 5 is a schematic structural view of a vortex impeller in embodiment 1 of the present invention
FIG. 6 is a schematic structural view of a coalescing filter according to embodiment 2 of the present invention;
FIG. 7 is a schematic view showing a partial structure of a coalescing filter in example 2 of the present invention;
FIG. 8 is a graph comparing the pressure differential of a coalescing filter of the present invention with a prior art filter under experimental test conditions;
FIG. 9 is a graph comparing the pressure differential of a coalescing filter of the present invention with a prior art filter under field conditions;
FIG. 10 is a graph comparing steady state efficiency of a coalescing filter of the present invention with a prior art filter;
FIG. 11 is a graph comparing droplet concentration downstream of a coalescing filter of the invention with downstream of a prior art filter.
In the figure: 1 coalescing filter element, 11 upper end covers, 12 lower end covers, 13 supporting outer frameworks, 14 supporting inner frameworks, 121 material openings, 15 filter elements, 151 pre-filtering layers, 152 coalescing layers, 1521 droplet capture layers, 1522 hydrophilic layers, 1523 lyophobic layers, 153 liquid drainage layers, 16 driving pieces, 17 rotational flow impellers, 171 rotating shafts, 172 impeller columns, 173 blades, 2 shells, 21 air inlets, 22 air outlets, 23 liquid drainage holes, 24 liquid collecting jackets, 25 flow meters and 26 grid pads.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment provides a coalescing filter element, which includes an upper end cover 11, a lower end cover 12, a supporting outer frame 13, a supporting inner frame 14 and a filter element 15, wherein the supporting outer frame 13 and the supporting inner frame 14 are both cylindrical, and the supporting outer frame 13 and the supporting inner frame 14 are fully provided with through holes, the upper end cover 11 and the lower end cover 12 are both horizontally arranged and vertically distributed at intervals, the supporting outer frame 13 and the supporting inner frame 14 are both vertically arranged between the upper end cover 11 and the lower end cover 12, and the supporting inner frame 14 is located in the supporting outer frame 13, two ends of the supporting inner frame 14 and the supporting outer frame 13 are respectively connected with the upper end cover 11 and the lower end cover 12, the upper end cover 11, the lower end cover 12, the supporting outer frame 13 and the supporting inner frame 14 jointly enclose to form an annular installation cavity, the middle part of the lower end cover 12 is provided with a material port 121 communicating with the inner hole of the supporting inner frame 14, and the filter element 15 is filled in the installation cavity, so that gas enters the supporting inner frame after being filtered by the outside, so as to filter element, gas is filtered, and thereby gas is purified and particles are filtered by the filter element, thereby. The upper end cover is circular, the lower end cover is annular, the supporting outer framework and the supporting inner framework are both cylindrical and are coaxially distributed, and the filtering core is cylindrical.
As shown in fig. 2 and fig. 3, in the above technical solution, the filter element 15 is a cylindrical shape, and it sequentially includes a pre-filter layer 151, a coalescing layer 152 and a drainage layer 153 from outside to inside, so that the gas is primarily filtered by the pre-filter layer, then the gas after pre-filtering is further filtered by the coalescing layer, and finally the liquid drops in the gas after filtering by the coalescing layer are further trapped by the drainage layer.
As shown in fig. 4, in the above technical solution, the coalescing layer 152 sequentially includes a droplet capturing layer 1521, a lyophilic layer 1522 and at least one lyophobic layer 1523 from outside to inside, such that the droplet capturing layer pre-traps droplets in the gas, the lyophilic layer further absorbs the droplets in the gas, and the lyophobic layer separates the droplets in the gas for the absorption by the lyophilic layer, so as to reduce the number of droplets in the filtered gas.
In the above technical solution, the lyophilic layer 1522 and the lyophobic layer 1523 are both made of glass fibers, and the droplet capture layer 1521 is a fluoroalkyl acrylic acid copolymer coated on the outer side of the lyophilic layer 1522. Specifically, the lyophilic layer 1522 may be made of, but not limited to, lyophilic treated glass fibers, the lyophobic layer 1523 may be made of, but not limited to, lyophobic treated glass fibers, and the droplet capturing layer 1521 may be made of, but not limited to, a fluoroalkyl acrylic copolymer. The droplet capturing layer 1521 is formed by spraying a fluorine-containing alkyl acrylic copolymer on the surface of the hydrophilic layer 1522, the droplet capturing layer 1521 is formed integrally with the lyophilic layer 1522, and the droplet capturing layer 1521 is not a separate layer structure.
Further, the spray thickness of the droplet capture layer 1521 may be, but is not limited to, 150 μm to 200 μm.
Further, lyophobic layer 1523 can be the multilayer, and its number of piles is adjusted according to on-the-spot operating condition, sets up 1 to 3 layers under the usual condition.
The pre-filtering layer 151, the coalescing layer 152 and the drainage layer 153 are cylindrical, the coalescing layer 152 is arranged on the outer side of the drainage layer 153 in a covering mode, the inner wall of the coalescing layer 152 is tightly attached to the outer wall of the drainage layer 153, the pre-filtering layer 151 is arranged on the outer side of the coalescing layer 152 in a covering mode, and the inner wall of the pre-filtering layer 151 is tightly attached to the outer wall of the coalescing layer 152. The pre-filter layer 151 may be made of, but not limited to, non-woven fabric; the drainage layer 153 may be made of, but not limited to, needle felt or polyester fiber.
In the above technical solution, the outer wall of the coalescing layer 152 is uniformly provided with the corrugation-shaped protrusions which are inclined in the same direction along the circumferential direction of the coalescing layer 152, so that the filtering area of the coalescing layer is larger. The angle between the corrugation lobes and the tangent at the location of the corrugation is 15-30 deg.
The pleated corrugated protrusions formed on the outer wall of the coalescing layer 152 form a certain angle in the coalescing filter element, so that the liquid drops penetrating through the coalescing filter element can generate a tangential velocity, the tangential velocity is the same as the flow field generated by the blades, and under the action of centrifugal force generated by the flow field, the liquid drops penetrating through the coalescing filter element have a tangential acceleration, so that the tangential velocity of the liquid drops at the lower part of the blades 173 is increased, the effect of the flow field generated by the blades 173 is more obvious, and the filtering efficiency of the coalescing filter is improved.
The technical scheme includes that the cyclone gas filtering device further comprises a driving piece 16 and a cyclone impeller 17, the cyclone impeller 17 is arranged in an inner hole of the supporting inner framework 14, a rotating shaft 171 of the cyclone impeller 17 vertically extends upwards to penetrate through and penetrate the upper portion of the upper end cover 11 and is rotatably connected with the upper end cover 11, the upper end of the rotating shaft 171 is in transmission connection with the driving piece 16, the driving piece 16 is used for driving the cyclone impeller 17 to rotate in the supporting inner framework 14, so that filtered gas rotates at a high speed through the cyclone impeller, liquid drops in the gas are scattered to impact on the supporting inner framework, and the filtered gas drops are collected on the supporting inner framework and then deposited downwards.
In the above technical scheme, the driving member 16 is a motor, the driving member 16 is installed at the upper end of the upper end cover 11, the structure is simple, the motor is preferably a waterproof motor, and a conductive wire of the driving member penetrates out of the housing in a sealing manner.
As shown in fig. 5, in the above technical solution, the swirling flow impeller 17 further includes an impeller column 172 and blades 173 circumferentially and uniformly arranged on the sidewall of the impeller column 172 at intervals, and the lower end of the rotating shaft 171 is coaxially connected and fixed to the upper portion of the impeller column 172, so that the structure is simple, liquid droplets are scattered by the blades, and the scattering effect is good. The lower ends of the plurality of blades are inclined toward the same side, and the included angle between the inclined direction of the lower portions of the blades 173 and the horizontal direction is 15-45 degrees, preferably 30 degrees.
The principle of the coalescing filter element in this embodiment is as follows: when the gas enters the filter element, liquid drops in the gas contact the filter element and filter particle impurities in the gas through the pre-filtering layer 151, then the liquid drops are continuously captured by the liquid drop capturing layer 1521 containing the fluoroalkyl acrylic copolymer, and the captured liquid drops are transported inside the filter element; when the liquid drops are transported to the lyophilic layer 1522, the liquid drops begin to diffuse on the surface of the lyophilic layer 1522, the lyophilic layer 1522 can serve as a temporary liquid storage layer, the collected liquid drops are redistributed in the lyophilic layer 1522, and a liquid film is formed at the intersection point of filter material fibers in the lyophilic layer 1522; the strong repellency of the inner lyophobic layer 1523 prevents penetration of droplets, which tend to move along and disappear from between the lyophilic layer 1522 and the lyophobic layer 1523, but a certain number of droplets still move with the gas to penetrate the lyophilic layer 1522, in which case the inner lyophobic layer 1523 can transfer the droplets back to the area of the lyophilic layer 1522, thereby effectively reducing re-entrainment of the droplets into the downstream gas flow. The filter element (directional liquid infusion-super-lyophobic arrangement) can improve the filtration efficiency of the coalescence filter element under the condition of not improving the steady-state pressure drop of the coalescence filter element, and particularly for liquid drops with small particle size, the filtration efficiency is obviously improved compared with that of the traditional coalescence filter element.
The filter element in this embodiment is a prefilter layer 151, a coalescing layer 152 and a drainage layer 153 in sequence from outside to inside, the coalescing layer 152 comprises a droplet capture layer 1521, a lyophilic layer 1522 and at least one lyophobic layer 1523 in sequence from outside to inside to form a filter layer structure of 'directional infusion-ultralyophobic', the filter layer structure adopts a 'directional infusion-ultralyophobic' filter material arrangement mode of asymmetric wettability, and the filter layer structure has the advantage that under the condition of the same thickness and fiber structure, no matter small droplets or large droplets, the filter layer structure has higher quality factors than other traditional filter layer structures.
And a distance of 70mm to 90mm is reserved between the outer edge of the rotation track of the rotational flow impeller and the inner wall of the coalescence filter element.
The surface of the blade 173 is subjected to lyophobic treatment, the height of the blade 173 in the vertical direction is 10mm to 15mm, the number of the blades 173 is 6 to 10, and the distance between two adjacent blades 173 is the same.
Example 2
As shown in fig. 6 and 7, a coalescing filter includes a housing 2 and a coalescing filter element 1 according to embodiment 1, the housing 2 is hollow, an air inlet 21 is provided at an upper end of the housing 2 and communicates with the interior of the housing, the coalescing filter element 1 is vertically installed at a middle portion of an inner bottom wall of the housing 2, an air outlet 22 communicating with the material outlet 121 is provided at a position on the bottom wall of the housing 2 corresponding to the material outlet 121, an upper end of the air outlet 22 extends upward and inward into the support inner frame 14 (further, a height of an impeller column in a vertical direction is 1/5 to 1/4 of a height of the coalescing filter element in a vertical direction, a vertical distance between a bottom of a vane 173 and an upper end of the air outlet is 10mm to 15mm, and a distance between an inner wall of the upper end of the air outlet and a bottom of the vane is 10mm to 15mm in a horizontal direction, so as to minimize escape of liquid droplets through a gap between the vane 173 and the air outlet), and the impeller is close to a lower end of the cyclone bottom wall 17, and a drain hole 23 is provided at an edge of the housing 2, so that the air enters the housing and is filtered and discharged into the housing.
In the technical scheme, the lower end edge of the shell 2 is provided with an annular liquid collecting jacket 24 in a downward protruding mode, the upper end of the liquid collecting jacket 24 is uniformly provided with drain holes communicated with the interior of the shell 2, and the drain hole 23 is formed in the lower end of the liquid collecting jacket, so that the phenomenon that liquid drops are deposited in the shell to affect the filtering effect of the coalescing filter element can be avoided.
Certainly, can also be in set up annular grid pad 26 on the casing diapire, the grid pad is one-way drainage grid, the coalescence filter core passes through the grid pad is installed on the casing diapire, so make the inboard liquid droplet of coalescence filter core can flow back to the coalescence filter core through the grid pad outside, side by side to in the album liquid clamping sleeve, wherein, the grid pad can play the effect of drainage to liquid to accelerate the drainage speed of coalescence filter, solve the problem that coalescence filter liquid gathers, effectively promote the performance and the life of coalescence filter core in the coalescence filter.
The flow in the gas outlet is fluctuated due to unstable field working conditions, the flow of the downstream output gas can be measured through the flowmeter, the motor is subjected to feedback control according to the flow of the output gas, and the rotating speed of the driving piece is controlled in real time. When the gas flow velocity in the air inlet is more than 20m/s, the high-pressure gas in the air inlet can completely provide the flow velocity enough to generate the rotational flow field, so that the driving piece can stop working; when the gas flow velocity in the air inlet is less than 20m/s, controlling the electric driving part to start working so as to drive the blade rotational flow impeller to rotate, so that a flow field is generated below the rotational flow impeller, and the rotational speed of the rotational flow impeller can be determined by the following formula:
wherein: v. of r The rotating speed of the rotational flow impeller is expressed in r/min; q represents the pipe flow in m 3 H, D denotes an intake ductIn units of m, epsilon represents a correction factor, which is determined by the gas velocity v in the inlet duct,
the unit is m/s, and when the gas velocity is more than or equal to 10 and less than or equal to 20, the epsilon =1.025; when the gas velocity is 0 < v < 10, epsilon =0.986.
As shown in fig. 8 and 9, the pressure drop during experimental testing of the coalescing filter cartridge of this example was reduced by 0.5kPa to 0.8kPa from the steady state pressure drop of the existing cartridge (commercial cartridge commercially available); in the case of field applications, the service life of the coalescing filter element of the present invention is 3 times longer than that of the existing filter elements (when the pressure differential reaches 100kPa, the filter element needs to be replaced). As shown in fig. 10, compared with the 97.3% cumulative efficiency value of the conventional filter element, the cumulative efficiency value of the coalescing filter element of the invention is maintained to be more than 99.9%, and the efficiency is obviously improved; as shown in FIG. 11, the concentration of drops downstream of the coalescing filter element of the present invention is also substantially reduced compared to the prior art filter element, which has a drop count concentration downstream of 700P/cm 3 About, and the drop count concentration downstream of the coalescing filter element of the present invention is at 60P/cm 3 Left and right; as shown in fig. 11, the coalescing filter element of the present invention also has a significantly improved filtering effect for droplets having a particle size greater than 1 μm compared to the conventional filter element.
As shown in fig. 10, the cumulative efficiency of the prior art filter element at a droplet size of 6 μm is significantly reduced, indicating that the prior art filter element exhibits re-entrainment, while the cumulative efficiency of the coalescing filter element 10 of the present invention at large droplets is close to 100%, indicating that the coalescing filter element of the present invention does not exhibit the problem of large droplets entering downstream of the coalescing filter element due to the re-entrainment.
In conclusion, the coalescence filter element provided by the invention has the advantages that the service life of the coalescence filter element is effectively prolonged while the filtering efficiency is improved, and the problem of efficiency reduction of the accumulative efficiency at large-particle-size liquid drops caused by secondary entrainment can be effectively solved.
Claims (9)
1. The utility model provides a coalescence filter core, its characterized in that includes upper end cover (11), lower end cover (12), supports outer skeleton (13), supports inner frame (14) and crosses filter core (15), it is the cylindric to support outer skeleton (13) and support inner frame (14), just support outer skeleton (13) and support inner frame (14) and go up to be covered with the through-hole, upper end cover (11) and lower end cover (12) average level setting and interval distribution from top to bottom, support outer skeleton (13) and support the equal vertical setting of inner frame (14) and be in between upper end cover (11) and lower end cover (12), just it is located to support inner frame (14) support outer skeleton (13), support inner frame (14) and support the both ends of outer skeleton (13) respectively with upper end cover (11) and lower end cover (12) are connected, upper end cover (11), lower end cover (12), support outer skeleton (13) and support inner frame (14) enclose jointly and form an annular installation cavity, lower end cover (12) be equipped with the middle part of support inner frame (12) and cross filter core (121), filter core (15) in the installation cavity.
2. The coalescing filter element according to claim 1 wherein the filter element (15) is cylindrical, comprising from the outside to the inside a cylindrical pre-filter layer (151), a coalescing layer (152) and a drainage layer (153).
3. The coalescing filter element according to claim 2 wherein the coalescing layer (152) comprises, in order from outside to inside, a drop capture layer (1521), a lyophilic layer (1522), and at least one lyophobic layer (1523).
4. The coalescing filter element according to claim 2 wherein the coalescing layer (152) is formed with pleat wave-shaped bulges inclining to the same direction along the circumferential direction of the coalescing layer (152) on the outer wall.
5. The coalescing filter element according to any one of claims 1 to 4, further comprising a driving member (16) and a swirl impeller (17), wherein the swirl impeller (17) is arranged in the inner hole of the support inner frame (14), a rotating shaft (171) of the swirl impeller (17) vertically extends upwards to penetrate through and out of the upper part of the upper end cover (11) and is rotatably connected with the upper end cover (11), the upper end of the rotating shaft (171) is in transmission connection with the driving member (16), and the driving member (16) is used for driving the swirl impeller (17) to rotate in the support inner frame (14).
6. The coalescing filter element according to claim 5 wherein the drive member (16) is an electric motor, the drive member (16) being mounted at an upper end of the upper end cap (11).
7. The coalescing filter element according to claim 5 wherein the swirl impeller (17) further comprises an impeller column (172) and blades (173) circumferentially and uniformly arranged on the side wall of the impeller column (172), and the lower end of the rotating shaft (171) is fixedly connected with the upper coaxial of the impeller column (172).
8. A coalescing filter, comprising a housing (2) and the coalescing filter element (1) according to any one of claims 5 to 7, wherein the housing (2) is hollow inside, the upper end of the housing (2) is provided with an air inlet (21) communicated with the inside of the housing, the coalescing filter element (1) is vertically installed in the middle of the inner bottom wall of the housing (2), an air outlet (22) communicated with the material port (121) is arranged at the position on the bottom wall of the housing (2) corresponding to the material port (121), the upper end of the air outlet (22) extends upwards and inwards to the inside of the supporting inner frame (14) and is close to the lower end of the swirl impeller (17), and an air discharge hole (23) is arranged at the edge of the bottom wall of the housing (2).
9. The coalescing filter according to claim 8, wherein an annular liquid collecting jacket (24) is convexly arranged at the lower end edge of the shell (2) downwards, drain holes penetrating into the shell (2) are evenly distributed at the upper end of the liquid collecting jacket (24), and the drain holes (23) are arranged at the lower end of the liquid collecting jacket.
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| CN116983783A (en) * | 2023-09-26 | 2023-11-03 | 新乡市华航航空液压设备有限公司 | High-efficient high-pressure air filter |
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