CN115212668B - Coalescing filter element and coalescing filter - Google Patents
Coalescing filter element and coalescing filter Download PDFInfo
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- CN115212668B CN115212668B CN202210162396.4A CN202210162396A CN115212668B CN 115212668 B CN115212668 B CN 115212668B CN 202210162396 A CN202210162396 A CN 202210162396A CN 115212668 B CN115212668 B CN 115212668B
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- 239000000463 material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 56
- 238000001914 filtration Methods 0.000 claims description 24
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 53
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 46
- 239000003345 natural gas Substances 0.000 description 23
- 230000000694 effects Effects 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000012535 impurity Substances 0.000 description 7
- 238000011045 prefiltration Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229920006243 acrylic copolymer Polymers 0.000 description 4
- 125000003709 fluoroalkyl group Chemical group 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000004581 coalescence Methods 0.000 description 3
- 239000000306 component Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Classifications
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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
-
- 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
Landscapes
- 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, wherein the supporting outer framework and the supporting inner framework are cylindrical, through holes are fully 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 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 mounting cavity, the middle part of the lower end cover is provided with a material opening communicated with an inner hole of the supporting inner framework, and the filter element is filled in the mounting cavity, so that the filter element filters gas, and particulate components in the gas are filtered, and 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 natural gas production and demand increases, more and more natural gas delivery pipelines and gas stations along the way are built. These pipelines often incorporate many impurity contaminants during the transport of natural gas that can affect the safe operation of the natural gas pipeline and the compressor plant, and therefore, it is desirable to clean the natural gas from impurity contaminants to reduce damage to the pipeline and the plant. The natural gas filter and the coalescer are used as mature natural gas purifying equipment and widely applied to various natural gas conveying pipelines, and the performance of the core element filter element directly influences the purifying effect of the filter and the coalescer on natural gas.
As contaminants can adversely affect the natural gas pipeline and the compressor 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, cyclone separators and filter separators (the filter separators are mainly used for separating solid particles and liquid drops with the particle diameters larger than 1 mu m), dry gas sealing filters, gas filters and other equipment are usually arranged in the gas station to purify natural gas. The natural gas entering the station passes through the cyclones and filters in sequence and then mostly enters the compressor. The pressure in the natural gas pipeline is very high, and the air current speed is very fast, so liquid impurity in the natural gas can cause erosive wear to the natural gas pipeline inner wall under the effect of high-speed air current, especially in weak links such as elbow, the condition that erosive wear became invalid is more serious, and impurity in the pipeline can block the sampling port of pipeline or equipment instrument moreover for instrument measurement takes place deviation or inefficacy, causes the potential safety hazard. Impurities in the natural gas pipeline can cause erosive wear effects on the compressor and the gas turbine blades in the gas station, and vibration overruns and is forced to stop when serious. In addition, a large amount of liquid impurities exist in the high-pressure natural gas transportation process, and the operation safety of pipeline instruments and compressor units is endangered, so that corresponding filtering and separating devices are required 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 below 1 μm in the gas, the core component of which is a coalescing filter element) is one of the most commonly used methods at present, and the following problems exist in the conventional natural gas coalescing filter:
1. the steady pressure drop in the filtering process of the coalescing filter element is increased while the precision of the coalescing filter element is improved, so that the quality factor of the coalescing filter element is greatly reduced and the energy consumption is increased;
2. the coalescing filter element has the secondary entrainment phenomenon (the process that liquid drops enter the gas phase again under the action of the gas flow after being separated from the gas phase), so that the liquid drops with larger particle sizes can appear at the downstream, and the filtration efficiency of the coalescing filter is affected;
3. when the filtering process reaches a steady state, the coalescing filter element in the coalescing filter starts to drain, the drain speed of the coalescing filter drain device is slow, liquid is accumulated at the bottom, the accumulated liquid can soak the coalescing filter element, the filter material is damaged, and the coalescing filter element is invalid when serious, so that the performance and the service life of the coalescing filter element are affected.
The problems can affect the normal operation of long-distance natural gas pipelines and along-way gas stations, and can cause great economic loss when serious.
Disclosure of Invention
In order to solve the technical problems, one of the purposes of the invention is to provide a coalescing filter element which has a simple structure, can remarkably improve the filtering efficiency without increasing the pressure drop, and greatly reduces the secondary entrainment phenomenon.
In order to achieve the above object, the technical scheme of the present invention is as follows: the utility model provides a coalescence filter core, includes upper end cover, lower extreme cover, supports the outer skeleton, supports inner skeleton and crosses the filter core, support outer skeleton and support the inner skeleton and be cylindric, just support and be full of the through-hole on outer skeleton and the support inner skeleton, upper end cover and lower extreme cover all level set up and upper and lower interval distribution, support outer skeleton and support the equal vertical setting of inner skeleton and be in between upper end cover and the lower extreme cover, just support the inner skeleton and be located support in the outer skeleton, support the both ends of inner skeleton and support outer skeleton respectively with upper end cover and lower extreme cover are connected, upper end cover, lower extreme cover, support outer skeleton and support the inner skeleton and enclose jointly and form an annular installation cavity, the middle part of lower extreme cover be equipped with the feed inlet that supports the inner hole and link up, the filter core is filled in the installation cavity.
The beneficial effects of the technical scheme are that: so make gas enter into the support inner frame after the filter core filters by the coalescence filter core outside, filter the gas by the filter core like this to filter the particulate component in the gas, thereby purify the gas.
In the technical scheme, the filter core is cylindrical, and is sequentially provided with a cylindrical pre-filtering layer, a converging layer and a drainage layer from outside to inside.
The beneficial effects of the technical scheme are that: the gas is initially filtered through the pre-filter layer, the pre-filtered gas is further filtered through the coalescing layer, and finally liquid drops in the gas filtered through the coalescing layer are further trapped through the liquid draining layer.
In the technical scheme, the coalescing layer sequentially comprises a liquid drop capturing layer, a lyophile layer and at least one lyophobic layer from outside to inside.
The beneficial effects of the technical scheme are that: the liquid drop capturing layer is used for pre-capturing liquid drops in the gas, the liquid drop capturing layer is used for further absorbing the liquid drops in the gas, and the lyophobic layer is used for isolating the liquid drops in the gas so as to facilitate the absorption of the liquid drop capturing layer, so that the liquid drops in the filtered gas are fewer.
In the above technical scheme, the outer wall of the coalescing layer is uniformly distributed with corrugated protrusions which incline towards the same direction along the circumferential direction of the coalescing layer.
The beneficial effects of the technical scheme are that: this results in a larger filter area for the coalescing layer.
The technical scheme is characterized by further comprising a driving piece and a rotational flow impeller, wherein the rotational flow impeller is arranged in the inner hole of the supporting inner framework, a rotating shaft of the rotational flow impeller vertically extends upwards to penetrate through and out of the upper end cover and is rotationally connected with the upper end cover, the upper end of the rotating shaft is in transmission connection with the driving piece, and the driving piece is used for driving the rotational flow impeller to rotate in the supporting inner framework.
The beneficial effects of the technical scheme are that: the gas after filtration is rotated at a high speed by the cyclone impeller, and liquid drops in the gas are scattered to impact on the supporting inner framework and are accumulated on the supporting inner framework to be deposited downwards.
In the above technical scheme, the driving piece is a motor, and the driving piece is installed at the upper end of the upper end cover.
The beneficial effects of the technical scheme are that: the structure is simple.
In the above technical scheme, the rotational flow impeller further comprises impeller columns and blades uniformly arranged on the side walls of the impeller columns at intervals in the circumferential direction, and the lower end of the rotating shaft is fixedly connected with the upper parts of the impeller columns in a coaxial manner.
The beneficial effects of the technical scheme are that: the device has a simple structure, liquid drops are scattered through the blades, and the scattering effect is good.
The second object 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 coalescing filter comprises a shell and the coalescing filter element, wherein the shell is hollow, the upper end of the shell is provided with an air inlet communicated with the inside of the shell, the coalescing filter element is vertically arranged in the middle of the bottom wall of the shell, an air outlet communicated with the material inlet is arranged on the bottom wall of the shell at the position corresponding to the material inlet, the upper end of the air outlet extends upwards and inwards into the supporting inner framework and is close to the lower end of the cyclone impeller, and a liquid discharge hole is formed in the edge of the bottom wall of the shell.
The beneficial effects of the technical scheme are that: the structure is simple, so that the gas is filtered by the coalescing filter element after entering the shell, and the trapped particulate components and liquid drops are deposited in the shell to be discharged downwards.
According to the technical scheme, the annular liquid collecting jacket is arranged at the edge of the lower end of the shell in a protruding mode, drain holes penetrating through the shell are uniformly distributed in the upper end of the liquid collecting jacket, and the drain holes are arranged at the lower end of the liquid collecting jacket.
The beneficial effects of the technical scheme are that: thus, the liquid drops are prevented from depositing in the shell to influence the filtering effect of the coalescing filter element.
Drawings
FIG. 1 is a schematic 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 cartridge of example 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of a filter cartridge according to example 1 of the present invention;
FIG. 4 is a schematic structural diagram of a coalescing layer in embodiment 1 of the present invention;
FIG. 5 is a schematic view of a swirl impeller according to embodiment 1 of the present invention
FIG. 6 is a schematic view of a coalescing filter according to example 2 of the present invention;
FIG. 7 is a schematic view of a partial construction of a coalescing filter in accordance with example 2 of the present invention;
FIG. 8 is a graph comparing differential pressure of a coalescing filter of the present invention with a prior art filter under experimental test conditions;
FIG. 9 is a graph comparing differential pressure of a coalescing filter of the present invention with a prior art filter under in situ 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 present invention with downstream of a prior art filter.
In the figure: 1 a coalescing filter element, 11 an upper end cover, 12 a lower end cover, 13 a supporting outer framework, 14 a supporting inner framework, 121 a material opening, 15 a filter element, 151 a pre-filtering layer, 152 a coalescing layer, 1521 a liquid drop capturing layer, 1522 a lyophile layer, 1523 a lyophobic layer, 153 a liquid discharging layer, 16 a driving piece, 17 a cyclone impeller, 171 a rotating shaft, 172 impeller columns, 173 blades, 2 a shell, 21 an air inlet, 22 an air outlet, 23 a liquid discharging hole, 24 a liquid collecting jacket, 25 a flowmeter and 26 grid pads.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment provides a coalescing filter element, which comprises an upper end cover 11, a lower end cover 12, a supporting outer skeleton 13, a supporting inner skeleton 14 and a filter element 15, wherein the supporting outer skeleton 13 and the supporting inner skeleton 14 are cylindrical, through holes are fully distributed on the supporting outer skeleton 13 and the supporting inner skeleton 14, the upper end cover 11 and the lower end cover 12 are horizontally arranged and vertically distributed at intervals, the supporting outer skeleton 13 and the supporting inner skeleton 14 are vertically arranged between the upper end cover 11 and the lower end cover 12, and the supporting inner skeleton 14 is positioned in the supporting outer skeleton 13, the both ends of supporting inner skeleton 14 and supporting outer skeleton 13 respectively with upper end cover 11 and lower end cover 12 are connected, upper end cover 11, lower end cover 12, supporting outer skeleton 13 and supporting inner skeleton 14 enclose jointly and form an annular installation cavity, the middle part of lower end cover 12 be equipped with the material mouth 121 that supporting inner skeleton 14 hole link up, filter core 15 is filled in the installation cavity, so make gas enter into in the supporting inner skeleton after the filter core filters by the coalescence filter core outside, so filter the gas by the filter core to filter the particulate component in the gas, thereby purify the gas. The upper end cover is circular, the lower end cover is circular, the supporting outer framework and the supporting inner framework are both cylindrical, and the supporting outer framework and the supporting inner framework are coaxially distributed, and the filtering core is cylindrical.
As shown in fig. 2 and fig. 3, the filter element 15 in the above technical solution is cylindrical, and is sequentially formed by a pre-filtering layer 151, a coalescing layer 152 and a drain layer 153 from outside to inside, so that the pre-filtering is performed on the gas by the pre-filtering layer, then the pre-filtering is further performed on the gas by the coalescing layer, and finally the liquid drops in the gas filtered by the coalescing layer are further trapped by the drain layer.
As shown in fig. 4, the coalescing layer 152 in the above technical solution includes, from outside to inside, a droplet capturing layer 1521, a lyophile layer 1522 and at least one lyophobic layer 1523, so that the droplet capturing layer pre-captures droplets in the gas, the lyophile layer further absorbs the droplets in the gas, and the lyophobic layer separates the droplets in the gas so as to facilitate absorption of the lyophile layer, thereby making the droplets in the filtered gas less.
In the above technical solution, the lyophile layer 1522 and the lyophobic layer 1523 are both made of glass fiber, and the droplet capturing layer 1521 is a fluoroalkyl acrylic copolymer, which is coated on the outer side of the lyophile layer 1522. In particular, lyophile layer 1522 may be made of, but is not limited to, lyophile treated glass fibers, lyophobic layer 1523 may be made of, but is not limited to, lyophobic treated glass fibers, and droplet capturing layer 1521 may be made of, but is not limited to, fluoroalkyl-containing acrylic copolymer. The droplet capturing layer 1521 is formed by spraying a fluoroalkyl acrylic copolymer onto the surface of the lyophile layer 1522, the droplet capturing layer 1521 is formed integrally with the lyophile layer 1522, and the droplet capturing layer 1521 is not a separate layer structure.
Further, the spray thickness of the droplet capturing layer 1521 may be, but is not limited to, 150 μm to 200 μm.
Further, the lyophobic layer 1523 may be multiple layers, and the number of layers is adjusted according to the actual working conditions in the field, and is usually set to 1 to 3 layers.
The prefilter layer 151, the coalescing layer 152 and the drain layer 153 are all cylindrical, the coalescing layer 152 is covered on the outer side of the drain layer 153, the inner wall of the coalescing layer 152 is tightly attached to the outer wall of the drain layer 153, the prefilter layer 151 is covered on the outer side of the coalescing layer 152, and the inner wall of the prefilter layer 151 is tightly attached to the outer wall of the coalescing layer 152. Wherein the pre-filter layer 151 may be made of, but not limited to, non-woven fabrics; the drainage layer 153 may be made of, but is not limited to, needled felt or polyester fibers.
In the above technical solution, the outer wall of the coalescing layer 152 is uniformly distributed with corrugated protrusions 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 included angle between the corrugated bulge and the tangent line at the position is 15-30 degrees.
The pleated filter material is formed into a certain angle in the coalescing filter element by the pleated wavy protrusions formed on the outer wall of the coalescing layer 152, so that the droplets penetrating the coalescing filter element can generate a tangential velocity which is in the same direction as the flow field generated by the blades, and the droplets penetrating the coalescing filter element have a tangential acceleration under the action of centrifugal force generated by the flow field, thereby improving the tangential velocity of the droplets at the lower part of the blades 173, making the effect of the flow field generated by the blades 173 more obvious, and improving the filtration efficiency of the coalescing filter.
The technical scheme further comprises a driving piece 16 and a swirl impeller 17, wherein the swirl impeller 17 is arranged in an inner hole of the supporting inner framework 14, a rotating shaft 171 of the swirl impeller 17 vertically extends upwards to penetrate through and pass out of the upper end cover 11 and is in rotary connection 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 swirl impeller 17 to rotate in the supporting inner framework 14, so that filtered gas is enabled to rotate at a high speed by the swirl impeller, droplets in the gas are scattered to collide on the supporting inner framework, and the droplets are accumulated on the supporting inner framework and then deposited downwards.
In the above technical solution, the driving element 16 is a motor, the driving element 16 is mounted at the upper end of the upper end cover 11, the structure is simple, the motor is preferably a waterproof motor, and the conductive wire of the driving element is sealed to pass out of the casing.
As shown in fig. 5, in the above technical solution, the swirl impeller 17 further includes an impeller column 172 and blades 173 uniformly arranged on the side wall of the impeller column 172 at circumferential intervals, the lower end of the rotating shaft 171 is fixedly connected with the upper part of the impeller column 172 coaxially, the structure is simple, the droplets are dispersed by the blades, and the dispersing effect is good. The lower ends of the plurality of blades are inclined toward the same side, and the angle between the inclined direction of the lower portion of the blade 173 and the horizontal direction is 15 ° to 45 °, preferably 30 °.
The principle of 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 firstly filter particle impurities in the gas through the pre-filter layer 151, and then the liquid drops are continuously captured by the liquid drop capturing layer 1521 of the fluoroalkyl acrylic copolymer, and the captured liquid drops migrate in the filter element; when the droplets migrate to the lyophile layer 1522, the droplets begin to spread on the surface of the lyophile layer 1522, at which time the lyophile layer 1522 can act as a temporary reservoir, redistribute the collected droplets within the lyophile layer 1522, and form a liquid film within the lyophile layer 1522 at the intersection of the filter fibers; the strong repellency of the inner lyophobic layer 1523 prevents penetration of the droplets, which tend to move along between the lyophobic layer 1522 and the lyophobic layer 1523 and fade away, but there is still a certain number of droplets moving with the gas to penetrate the lyophobic layer 1522, in which case the lyophobic layer 1523 located on the inner side can transfer the droplets back to the region of the lyophobic layer 1522, thereby effectively reducing entrainment of the droplets into the downstream gas flow again. The filter core (directional transfusion-super lyophobic arrangement) can improve the filtration efficiency of the coalescing filter core under the condition of not improving the steady pressure drop of the coalescing filter core, and particularly for small-particle-size liquid drops, the filtration efficiency is obviously improved compared with that of the traditional coalescing filter core.
The filter core in this embodiment sequentially comprises, from outside to inside, a pre-filter layer 151, a coalescing layer 152 and a drain layer 153, wherein the coalescing layer 152 sequentially comprises, from outside to inside, a liquid drop capturing layer 1521, a lyophile layer 1522 and at least one lyophobic layer 1523, so as to form a "directional transfusion-super lyophobic" filter layer structure, which adopts an asymmetric wettability "directional transfusion-super lyophobic" filter material arrangement mode.
A distance of 70mm to 90mm is reserved between the outer edge of the rotational track of the rotational flow impeller and the inner wall of the coalescing filter element.
The surface of the blades 173 is subjected to lyophobic treatment, the height of the blades 173 in the vertical direction is 10mm to 15mm, the number of the blades 173 is 6 to 10, and the interval between two adjacent blades 173 is the same.
Example 2
As shown in fig. 6 and 7, a coalescing filter comprises a housing 2 and a coalescing filter element 1 according to embodiment 1, wherein the housing 2 is hollow, an air inlet 21 communicated with the interior of the housing 2 is arranged at the upper end of the housing 2, the coalescing filter element 1 is vertically arranged in the middle of the inner bottom wall of the housing 2, an air outlet 22 communicated with the material inlet 121 is arranged on the bottom wall of the housing 2 at a position corresponding to the material inlet 121, the upper end of the air outlet 22 extends inwards into the supporting inner framework 14 upwards (further, the vertical height of an impeller column is 1/5 to 1/4 of the vertical height of the coalescing filter element, the vertical distance between the bottom of the blade 173 and the upper end of the air outlet is 10mm to 15mm, and the horizontal distance between the inner wall of the upper end of the air outlet and the bottom of the blade is 10mm to 15mm, so as to minimize the escape of liquid drops through gaps between the blade 173 and the air outlet), and a drain hole 23 is arranged near the lower end of the cyclone impeller 17, and the edge of the bottom wall of the housing 2, so that the liquid drops are trapped in the housing and discharged into the housing through the coalescing filter element after entering the housing.
In the above technical scheme, the edge of the lower end of the casing 2 is provided with the annular liquid collecting jacket 24 in a protruding manner, drain holes penetrating through the casing 2 are uniformly 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, so that liquid drops can be prevented from depositing inside the casing to affect the filtering effect of the coalescing filter element.
Of course, the annular grid pad 26 can be arranged on the inner bottom wall of the shell, the grid pad is a one-way drainage grid, and the coalescing filter element is arranged on the inner bottom wall of the shell through the grid pad, so that liquid drops on the inner side of the coalescing filter element can flow back to the coalescing filter element through the grid pad and are discharged into the liquid collecting jacket, wherein the grid pad can play a role in draining liquid, so that the liquid draining speed of the coalescing filter is accelerated, the problem of liquid accumulation of the coalescing filter is solved, and the performance and the service life of the coalescing filter element are effectively improved.
The flow in the air outlet is fluctuated due to unstable field working conditions, the flow of 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 flow rate of the gas in the gas inlet is more than 20m/s, the high-pressure gas in the gas inlet can completely provide enough flow rate for generating a swirling flow field, so that the driving piece can stop working; when the gas flow rate in the gas inlet is less than 20m/s, the electric driving part is controlled to start to work so as to drive the vane cyclone impeller to rotate, so that a flow field is generated below the cyclone impeller, and the rotating speed of the cyclone impeller can be determined by the following formula:
wherein: v r The rotational speed of the rotational flow impeller is expressed, and the unit is r/min; q represents the pipeline flow, the unit is m 3 Wherein/h, D represents the inner diameter of the intake duct in m, ε represents a correction factor determined by the velocity v of air in the intake duct,the unit is m/s, and when the air speed is more than or equal to 10 and less than or equal to 20, epsilon=1.025; epsilon=0.986 when the gas velocity is 0 < v < 10.
As shown in fig. 8 and 9, the pressure drop of the coalescing filter cartridge of this example during experimental testing was reduced by 0.5kPa to 0.8kPa from the steady state pressure drop of an existing cartridge (commercially available cartridge); 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 existing filter elements (when the pressure differential reaches 100kPa, the filter element needs to be replaced). As shown in FIG. 10, 97.3% of the filter element is accumulatedThe accumulated efficiency value of the coalescing filter element is maintained to be more than 99.9%, so that the efficiency is obviously improved; as shown in FIG. 11, the concentration of droplets downstream of the coalescing filter element of the present invention was also significantly reduced compared to prior filter elements having a droplet count concentration of 700P/cm 3 About 60P/cm drop count concentration downstream of the coalescing filter element of the present invention 3 Left and right; as shown in FIG. 11, the coalescing filter element of the present invention also provides a significant improvement over conventional filter elements in terms of the filtering effect of droplets having a particle size greater than 1 μm.
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 a secondary entrainment, while the cumulative efficiency of the coalescing filter element 10 of the present invention at large droplets is approximately 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 secondary entrainment.
In summary, the coalescing filter element of the invention effectively prolongs the service life of the coalescing filter element while improving the filtering efficiency, and can effectively solve the problem of efficiency reduction of accumulated efficiency at large-particle-diameter liquid drops caused by secondary entrainment.
Claims (4)
1. A coalescing filter, characterized in that it comprises a housing (2) and a coalescing filter element (1);
the coalescing filter element comprises an upper end cover (11), a lower end cover (12), a supporting outer framework (13), a supporting inner framework (14) and a filter element (15), wherein the supporting outer framework (13) and the supporting inner framework (14) are cylindrical, through holes are fully distributed on the supporting outer framework (13) and the supporting inner framework (14), the upper end cover (11) and the lower end cover (12) are horizontally arranged and vertically distributed at intervals, the supporting outer framework (13) and the supporting inner framework (14) are vertically arranged between the upper end cover (11) and the lower end cover (12), the supporting inner framework (14) is positioned in the supporting outer framework (13), two ends of the supporting inner framework (14) and the supporting outer framework (13) are respectively connected with the upper end cover (11) and the lower end cover (12), an annular mounting cavity is formed by surrounding the upper end cover (11), the lower end cover (12), the supporting outer framework (13) and the supporting inner framework (14), and the supporting inner framework (12) together, and an inner hole (121) is formed in the middle of the lower end cover (12), and the inner filter element (121) is filled in the inner hole;
the filter core (15) is cylindrical, and is sequentially cylindrical from outside to inside, and comprises a pre-filtering layer (151), a coalescing layer (152) and a drainage layer (153);
the coalescing layer (152) comprises a liquid drop capturing layer (1521), a lyophile layer (1522) and at least one lyophobic layer (1523) from outside to inside in sequence;
the outer wall of the coalescing layer (152) is uniformly distributed with pleat wave-shaped bulges which incline towards the same direction along the circumferential direction of the coalescing layer (152);
the coalescing filter element further comprises a driving piece (16) and a cyclone impeller (17), wherein 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 out of the upper end cover (11) and is rotationally 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), and blades (173) with surfaces subjected to lyophobic treatment are arranged on the cyclone impeller (17);
the inside of the shell (2) is hollow, an air inlet (21) communicated with the inside of the shell (2) is formed in the upper end of the shell (2), the coalescing filter element (1) is vertically arranged in the middle of the inner bottom wall of the shell (2), an air outlet (22) communicated with the material inlet (121) is formed in the position, corresponding to the material inlet (121), of the bottom wall of the shell (2), the upper end of the air outlet (22) extends inwards into the supporting inner framework (14) and is close to the lower end of the cyclone impeller (17), and a liquid discharge hole (23) is formed in the edge of the bottom wall of the shell (2);
when the flow rate of the gas in the gas inlet is more than 20m/s, the high-pressure gas in the gas inlet can completely provide enough flow rate for generating a swirling flow field, so that the driving piece can stop working; when the gas flow rate in the gas inlet is less than 20m/s, the driving piece starts to work so as to drive the vane cyclone impeller to rotate, so that a flow field is generated below the cyclone impeller, and the rotating speed of the cyclone impeller can be determined by the following formula:
wherein: v r The rotational speed of the rotational flow impeller is expressed, and the unit is r/min; q represents the pipeline flow, the unit is m 3 Wherein/h, D represents the inner diameter of the intake duct in m, ε represents a correction factor determined by the velocity v of air in the intake duct,the unit is m/s, and when the air speed is more than or equal to 10 and less than or equal to 20, epsilon=1.025; epsilon=0.986 when the gas velocity is 0 < v < 10.
2. The coalescing filter according to claim 1, 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).
3. The coalescing filter according to claim 1, wherein the cyclone impeller (17) further comprises an impeller column (172) and blades (173) uniformly arranged on the side wall of the impeller column (172) at circumferential intervals, and the lower end of the rotating shaft (171) is fixedly connected with the upper part of the impeller column (172) in a coaxial manner.
4. The coalescing filter according to claim 1, wherein an annular liquid collecting jacket (24) is arranged at the edge of the lower end of the shell (2) in a protruding manner, drain holes penetrating through the shell (2) are uniformly 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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| CN202210162396.4A CN115212668B (en) | 2022-02-22 | 2022-02-22 | Coalescing filter element and coalescing filter |
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| CN203710876U (en) * | 2014-02-28 | 2014-07-16 | 温岭市勤建电机厂 | Oil mist recycling air cleaner |
| DE102018008548A1 (en) * | 2017-11-15 | 2019-05-16 | Scania Cv Ab | Cyclone separator and associated device |
| CN110420517A (en) * | 2019-08-13 | 2019-11-08 | 中国石油大学(北京) | Coalescence filter core structure and filter device |
| CN112044229A (en) * | 2020-09-03 | 2020-12-08 | 巴崇书 | Oil mist purification separator |
| JP2021196112A (en) * | 2020-06-15 | 2021-12-27 | サンタ株式会社 | Oil removal filter |
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| US20140034580A1 (en) * | 2010-04-22 | 2014-02-06 | Kaydon Custom Filtration Corporation | Apparatus and method for removing contaminants from industrial fluid |
| WO2017007348A1 (en) * | 2015-07-08 | 2017-01-12 | Amazon Filters Spółka z Ograniczoną Odpowiedzialnością | Separation system for simultaneous removal of both solid particles and liquid droplets suspended in another liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203710876U (en) * | 2014-02-28 | 2014-07-16 | 温岭市勤建电机厂 | Oil mist recycling air cleaner |
| DE102018008548A1 (en) * | 2017-11-15 | 2019-05-16 | Scania Cv Ab | Cyclone separator and associated device |
| CN110420517A (en) * | 2019-08-13 | 2019-11-08 | 中国石油大学(北京) | Coalescence filter core structure and filter device |
| JP2021196112A (en) * | 2020-06-15 | 2021-12-27 | サンタ株式会社 | Oil removal filter |
| CN112044229A (en) * | 2020-09-03 | 2020-12-08 | 巴崇书 | Oil mist purification separator |
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