CN110917749A - Gas-liquid coalescence filter core and application and filter equipment who contains it - Google Patents
Gas-liquid coalescence filter core and application and filter equipment who contains it Download PDFInfo
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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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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Abstract
The invention provides a gas-liquid coalescence filter element, application thereof and a filtering device containing the gas-liquid coalescence filter element. The filter element comprises a pre-separation layer, a coalescing layer and a drainage layer which are arranged in sequence along the airflow direction; the aperture of the pre-separation layer is 8-12 μm, the thickness of the pre-separation layer is 1-2 mm, the pre-separation layer is formed by profiled fibers, and the whole body has hydrophobic and oleophobic properties; the aperture of the coalescence layer is 3-8 μm, the thickness of the coalescence layer is 0.4-0.6 mm, the coalescence layer is formed by profiled fibers, and the coalescence layer is divided into a hydrophobic and oleophobic area and a hydrophilic and hydrophilic area which are arranged at intervals along the circumferential direction; the aperture of the drainage layer is 10-20 μm, the thickness of the drainage layer is 2-3 mm, the drainage layer is formed by profiled fibers, the air inlet side is a hydrophilic and hydrophilic area, and the air outlet side is a hydrophobic and oleophobic area. The filter element of the invention can be used for filtering gas-liquid mixtures. The filter device containing the filter element can remarkably reduce the filtration pressure drop while improving the filtration efficiency.
Description
Technical Field
The invention relates to a filter element, in particular to a filter element for filtering a gas-liquid mixture, and belongs to the technical field of multiphase flow separation.
Background
Condensate droplets and particles are often carried in the transportation process of industrial gases such as natural gas, coal bed gas and the like and the use process of compressed air, and the impurities can cause serious problems such as corrosive wear of pipelines, measurement failure of metering equipment, failure of a dry gas sealing system of a compressor, shutdown of a large compressor unit and the like. To remove impurities, gas-liquid filtration is widely used in the above-mentioned industrial sites. Wherein, the tiny liquid drops are mainly removed by the coalescence-separation action of the gas-liquid coalescence-filter element.
The working principle of the gas-liquid coalescence filter element is as follows: the gas containing liquid passes through the aggregation layer and the liquid drainage layer from the inside of the filter element. The aperture of the coalescence layer is small, the fiber is fine, the liquid drop is easy to be caught and coalesced on the fiber to form large liquid drop, and the transmission between layers is carried out in the coalescence layer under the action of gas driving force and the capillary force of hydrophilic and oleophilic materials. When the liquid is transported to the last layer of exhaust side of the coalescing layer, the liquid drops are not easy to be discharged due to the capillary force action between the fibers and the liquid drops of the coalescing layer, so that the liquid can be accumulated on the surface and form a liquid film. The obstruction of the gas flow by this liquid film is the main cause of the too high pressure drop. The droplets are only discharged when the gravitational force of the droplets is greater than the capillary force between the droplets and the material. The effect of traditional drainage layer is then to prevent that gas from causing the secondary to smuggle when passing through the liquid film, and then improves filtration efficiency.
The aggregation layer and the drainage layer are the key points of the filtering performance of the gas-liquid coalescence filter element, the aggregation layer is a filter material with small aperture formed by glass fiber and polypropylene fiber, and the drainage layer is a filter material with large aperture formed by polyester fiber, polypropylene fiber, aramid fiber and the like. The main function of the coalescence layer is to intercept and coalesce small drops into large drops for discharge, and the main function of the drainage layer is to provide a drainage channel to prevent secondary entrainment. The gas passes through the filter element accumulation layer and the liquid drainage layer from inside to outside in sequence.
At pipeline conveying gas's in-process, the liquid drop constantly is intercepted by the filter core, and the filter core pressure drop constantly risees, and this not only makes gas handling capacity diminish, and the too high filter core that causes is buckled damage failure very easily simultaneously to the pressure drop, and then leads to a large amount of liquid drops to get into filter low reaches, causes the harm to pipeline, equipment, leads to shutting down the maintenance when serious. In order to ensure the normal operation of core equipment, a plurality of filtering separators and coalescing separators are generally arranged in a gas station along the way, although the treatment capacity is large, the more filter elements are, the higher the pressure drop is, the larger the energy consumption is, and the filter element cost and the energy consumption cost are increased.
It is worth noting that: in the field of gas-liquid coalescing filtration, pressure drop and efficiency are two of the most significant indicators of concern. Low resistance and high efficiency filter elements have been the ultimate goal of development. The liquid drop absorption and interception of the fibers are promoted, the efficiency is improved, the liquid discharge of the reinforcing material after the liquid absorption and interception is well performed, the phenomenon that the efficiency is improved, excessive liquid is accumulated while the material is prevented, more liquid drops are carried by subsequent air flow, the efficiency is reduced, and meanwhile, the pressure drop is further increased due to the excessive liquid in the material. This loses the original significance of improving efficiency and reducing pressure drop.
The existing gas-liquid coalescence filter can improve the efficiency by increasing the number of filter element layers, the pore size gradient arrangement of a filter layer, the drainage layer and the like, but has no good performance in the aspect of pressure drop.
Disclosure of Invention
The invention aims to provide a filter element for filtering gas and liquid, which can remarkably reduce the filtering pressure drop of the filter element while improving the filtering efficiency.
The invention also aims to provide an application of the filter element.
It is a further object of the present invention to provide a filter device comprising the filter cartridge of the present invention.
In order to achieve the technical purpose, the invention provides a gas-liquid coalescing filter element, which comprises a pre-separation layer, a coalescing layer and a liquid drainage layer which are sequentially arranged along the direction of gas flow;
wherein the aperture of the pre-separation layer is 8-12 μm, the thickness of the pre-separation layer is 1-2 mm, the pre-separation layer is formed by profiled fibers, and the whole pre-separation layer has water and oil repellency;
wherein the aperture of the aggregation layer is 3-8 μm, the thickness of the aggregation layer is 0.4-0.6 mm, the aggregation layer is formed by profiled fibers, and the aggregation layer is divided into a hydrophobic and oleophobic area and a hydrophilic and hydrophilic area which are arranged at intervals along the circumferential direction;
the pore diameter of the drainage layer is 10-20 microns, the thickness of the drainage layer is 2-3 mm, the drainage layer is formed by profiled fibers, the drainage layer is divided into a hydrophilic and hydrophilic area and a hydrophobic and oleophobic area along the thickness direction, the air inlet side is a hydrophilic and hydrophilic area, and the air outlet side is a hydrophobic and oleophobic area.
The gas-liquid coalescence filter element adopts the profiled fiber, exerts better liquid drop intercepting capacity through the larger specific surface area of the profiled fiber, enhances the capacity of absorbing and transmitting liquid through the stronger liquid wicking capacity of the profiled fiber, and prevents a large amount of liquid from accumulating in the filter element by matching with the arrangement of the specific hydrophobic and oleophobic area and the hydrophilic and lipophilic area, so that the filter element can better improve the efficiency, absorb the liquid and discharge the liquid, namely, the filtration pressure drop of the filter element can be obviously reduced while the filtration efficiency is improved.
The gas-liquid coalescence filter element comprises a profiled fiber pre-separation layer, a profiled fiber coalescence layer and a profiled fiber drainage layer.
The hydrophobic and oleophobic profiled fiber pre-separation layer adopted by the invention can effectively intercept large particles. A preseparation layer of a certain thickness may reduce the preseparation effect or add additional resistance. After the whole body is subjected to hydrophobic and oleophobic modification treatment, liquid drops can be quickly discharged and are not easy to accumulate in the liquid drops.
In one embodiment of the present invention, the material used for the profiled fiber in the pre-separation layer may be polyester fiber, polypropylene fiber or approximately coarse and fine oleophilic fiber (including oleophilic fiber obtained by modification treatment). The shape of the fibers of the profiled fibers used is non-circular, such as cross, triangular or trilobal (shown in fig. 1); preferably a cross-shape. The diameter (circumscribed circle diameter) of the shaped fibers used for the pre-separation layer is 12 μm to 18 μm, preferably 15 μm to 16 μm.
In one embodiment of the present invention, the pre-separation layer has a single-layer structure. For example, the preseparation layer may consist of a sub-separation layer; the pre-separation layer consists of one or more sub-separation layers. Preferably, the pre-separation layer consists of 1 sub-separation layer.
In one embodiment of the present invention, the pre-separation layer may be formed by needle punching or water punching the profiled fibers.
The profiled fiber aggregation layer with the hydrophilic and lipophilic regions and the hydrophobic and lipophilic regions is made of profiled fibers with specific diameters and apertures, so that the filtering and aggregation effects between fibers and liquid drops can be well exerted, and the highest filtering performance influenced by the filtering efficiency and the filtering pressure drop is realized. The larger specific surface area of the profiled fiber can effectively increase the liquid drop interception efficiency, and meanwhile, the stronger liquid wicking capability of the profiled fiber can accelerate the absorption and the migration of liquid.
In one embodiment of the present invention, the foreign fiber in the aggregation layer is made of glass fiber or substantially coarse oleophilic fiber (including oleophilic fiber obtained by modification). The shape of the fibers of the profiled fibers used is non-circular, such as cross, triangular or trilobal (shown in fig. 1); preferably a cross-shape. The diameter (circumscribed circle diameter) of the profiled fiber adopted by the aggregation layer is 3-5 μm.
In one embodiment of the invention, the coalescing layer is a multi-layer structure comprising a plurality of sub-coalescing layers. For example, the coalescing layer is formed from one or more coalescing layers. Preferably, the coalescing layer is comprised of 3-5 (4) subcondensing layers.
In one embodiment of the present invention, the coalescence layer may be obtained by dispersion defibering, beating, etc. of the profiled fibers.
In a specific embodiment of the invention, the vertical section of the hydrophobic and oleophobic area of the aggregation layer is in an upright trapezoid shape, the trapezoid structure fully utilizes the characteristic of possible longitudinal distribution of liquid, and the hydrophobic and oleophobic area with a larger bottom is more beneficial to accumulation and discharge of the liquid, such as a rectangle shape under the working condition of small liquid content; a plurality of hydrophobic and oleophobic areas are arranged at equal intervals; preferably, the coalescence layer has a perimeter of 5 pi cm to 12 pi cm and the coalescence layer comprises 4 to 8 hydrophobic and oleophobic zones. When the perimeter diameter of the filter element is designed to be smaller or larger than the range, the hydrophobic and oleophobic area is correspondingly reduced or increased. More preferably, the ratio of the length of the upper bottom to the length of the lower bottom of the upright trapezoid with the vertical section of the hydrophobic and oleophobic area is greater than or equal to 1/3 and less than 1, preferably 1/3-3/4.
The aggregation layer can change liquid distribution, promote liquid drops to be discharged from the hydrophobic and oleophobic area to the hydrophilic and oleophilic area from top to bottom, simultaneously reduce liquid accumulated in the filter element by the hydrophobic and oleophobic part, overcome the problem that liquid is difficult to discharge when the special-shaped fiber has strong liquid absorption capacity, and further reduce pressure drop.
The profiled fiber drainage layer adopted by the invention is provided with a hydrophobic and oleophobic area and a hydrophilic and lipophilic area, and the hydrophobic and oleophobic area prevents secondary entrainment of liquid drops. The drainage layer with a specific pore size can better absorb the liquid discharged by the aggregation layer and does not cause the increase of the pressure drop of the drainage layer. A drainage layer of a certain thickness simultaneously has a certain capacity to store liquid.
In one embodiment of the present invention, in the drainage layer, the raw material of the profiled fiber is polyester fiber, polypropylene fiber, or approximately coarse and fine oleophilic fiber (including oleophilic fiber obtained by modification treatment). The shape of the fibers of the profiled fibers used is non-circular, such as cross, triangular or trilobal (shown in fig. 1); preferably a cross-shape. The diameter (circumscribed circle diameter) of the shaped fiber used in the liquid discharge layer is 12 μm to 18 μm, preferably 15 μm to 16 μm.
In one embodiment of the present invention, the liquid discharge layer has a single-layer structure. For example, the drainage layer is composed of a sub-drainage layer; the drainage layer consists of one or more than two sub-drainage layers; preferably, the drainage layer consists of 1 sub-drainage layer.
In one embodiment of the present invention, the drainage layer may be formed by needle punching, water jet punching, etc. from profiled fibers.
In one embodiment of the invention, the thickness of the hydrophobic and oleophobic area of the drainage layer is 1/3-2/3, preferably 1/2, of the total thickness of the drainage layer.
The liquid drainage layer ensures that the profiled fibers have strong liquid absorption capacity, promotes the drainage of liquid after the coalescence of the coalescence layer, simultaneously ensures that the liquid cannot accumulate in the liquid drainage layer to cause secondary pressure drop increase and secondary liquid drop entrainment, effectively improves the efficiency and reduces the pressure drop.
In a specific embodiment of the invention, the gas-liquid coalescing filter element further comprises a support framework, and the support framework is wrapped with the pre-separation layer, the coalescing layer and the drainage layer.
In one embodiment of the present invention, the supporting framework may be a non-metallic material such as metal or polypropylene, and is used to support the outer layer of filter material, and the air flow flows radially outward from the inside of the framework.
The hydrophobic and oleophobic area and the hydrophilic and oleophilic area can be the existing hydrophobic and oleophobic material and hydrophilic and oleophilic material, and can be obtained by modifying the existing profiled fiber material. The hydrophobic and oleophobic modification treatment can adopt methods such as chemical reagent soaking and smearing or low-pressure plasma treatment to enable the fiber surface to have hydrophobic and oleophobic characteristics. The hydrophobic and oleophobic characteristic is tested according to international standards, wherein the oleophobic characteristic at least reaches 2 grade (ISO 14419-2010, textile oleophobic test standard), and the hydrophobic characteristic reaches 100 points (AATCC 22-2010, hydrophobic test standard).
The gas-liquid coalescence filter element can improve the filtration efficiency and simultaneously can obviously reduce the filtration pressure drop of the filter element. The filter element can be used for gas-liquid separation. The filter element has the accumulation efficiency of 99.48 to 99.78 percent for particles with the diameter of about 0.1 mu m, the number of penetrating particles is reduced by 30 percent, the accumulation efficiency of more than 0.3 mu m large particles is 99.83 to 99.99 percent, and the filtration pressure drop is reduced by about 2 KPa.
The invention also provides a filter device, wherein the filter device comprises the gas-liquid coalescence filter element. The device includes, but is not limited to, a gas-liquid coalescing filter.
Specifically, the three-layer structure of the filter element is respectively and sequentially and tightly wound on the filter framework, and the special-shaped fiber gas-liquid coalescence filter is formed by adhesive sealing with the upper metal sealing end cover and the lower metal sealing end cover.
The components (the pre-separation layer, the coalescing layer and the drainage layer) of the gas-liquid coalescing filter element disclosed by the invention all adopt fibers with special-shaped cross sections, the special-shaped fibers have larger specific surface area compared with the traditional round fibers, the flow field around the fibers is changed to a certain extent, the interception efficiency is increased, and for the special-shaped fibers with grooves, the grooves can store more filtered impurities and prevent secondary entrainment. Meanwhile, the capillary action is increased by the grooves, so that the absorption and transfer of liquid are facilitated, more liquid is discharged, and the pressure drop and the operation cost are effectively reduced.
The profiled fiber pre-separation layer enhances the interception effect on large particles and liquid drops, improves the efficiency, and ensures that the inside of the pre-separation layer is not blocked by the particles and the liquid due to the larger aperture; the profiled fiber aggregation layer improves the aggregation capability of small liquid drops and fibers, improves the efficiency, and simultaneously, the liquid is transported and transferred more quickly in the aggregation layer; the special-shaped fiber liquid drainage layer has a specific aperture, improves the absorption capacity of discharged liquid of the coalescence layer, effectively reduces pressure drop, solves the problem of overhigh pressure drop caused by accumulation of the liquid in the coalescence layer, and simultaneously ensures that liquid drops are not secondarily entrained.
The gas-liquid coalescence filter element is provided with the specific hydrophobic and oleophobic area and the specific hydrophilic and oleophilic area for the pre-separation layer, the coalescence layer and the liquid discharge layer respectively, so that large liquid drops are easier to fall off from the pre-separation layer, and the pressure drop and the subsequent coalescence layer are not easy to be influenced by accumulation in the pre-separation layer; for the coalescence layer, the hydrophilic and lipophilic regions and the hydrophobic and oleophobic regions are in patterned distribution, the hydrophilic and oleophobic parts guide liquid to move, the liquid distribution is changed, meanwhile, the trapezoidal stripes at the intervals of affinity and hydrophobicity are more beneficial to the accumulation of the liquid in the lipophilic region and the discharge of the liquid from top to bottom, and the accumulation of the liquid in the coalescence layer is effectively reduced; for the drainage layer, when guaranteeing stronger absorbed liquid ability, the gas discharge side is the interior liquid content that can effectual reduction accumulation in the drainage layer of hydrophobic oleophobic district, prevents that the liquid drop secondary from smuggleing secretly, improves filtration efficiency.
The gas-liquid coalescence filter element disclosed by the invention can be used for continuously winding each layer of structure, and is simple and convenient to process, compact in appearance and convenient to install. Meanwhile, the special-shaped fiber and the reasonably arranged hydrophilic and lipophilic regions have the synergistic effect, so that the filter element has the excellent characteristics of large specific surface area, strong interception capability, strong liquid absorption and transfer capability and the like of the special-shaped fiber, and meanwhile, the problems of accumulation of liquid in the filter element, secondary rise of pressure drop, entrainment of liquid drops and the like caused by the special-shaped fiber are solved through reasonable modification. The two interact, so that the efficiency of the filter element is improved, and the pressure drop is reduced.
The gas-liquid coalescence filter element can directly adopt the special-shaped fiber filter element under the condition of not changing the existing filtering and separating device of a station, so that the pressure drop and the energy consumption of the filter element are obviously reduced under the working conditions of different gas liquid contents at inlets (namely the working conditions of liquid content fluctuation), the service life of the filter element can be prolonged by more than 3 times under the same working conditions, and the operation cost is saved by more than 30%.
Drawings
FIG. 1 is a schematic view of the fiber shape of a shaped fiber.
Fig. 2A is a schematic front view of the gas-liquid coalescing filter according to example 1.
Fig. 2B is a schematic top view of the gas-liquid coalescing filter according to embodiment 1.
Fig. 3 is a schematic view of the patterning process of the profiled fiber coalescing layer of example 1.
Fig. 4 is a schematic view of the modified depth of the profiled fiber drainage layer of example 1.
Fig. 5 is a plot of pressure drop versus conventional filter element for the shaped fiber filter element of example 1.
Fig. 6 is a graph comparing the filtration efficiency of the profiled fiber filter element of example 1 to that of a conventional filter element.
Description of the main figures:
1. a support framework; 2. a profiled fiber pre-separation layer; 3. a profiled fiber coalescing layer; 4. and (4) draining the liquid layer by the profiled fibers.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Interpretation of related terms
Gas-liquid coalescence filter element: the filter is generally composed of an inner metal supporting framework and an outer fiber filtering material (including an inner coalescence layer and an outer drainage layer), when gas containing liquid drops passes through the filter, the liquid drops are captured by the fibers, small liquid drops are converged to gradually become larger liquid drops, and finally the larger liquid drops are discharged downwards along the outer surface of the filter under the action of gravity, so that the purpose of gas-liquid separation is achieved. The functions of each part are as follows:
sealing the end cover: the filter element is sealed and fixed to prevent gas leakage.
Support frame (filter frame): the rigidity and the strength of the filter element are increased, and the filter element is stable under the conditions of filter paper softening caused by high pressure and liquid wetting, gas impact and the like.
Pre-separation layer: for the early removal of solid particles and large liquid droplets entrained in the gas.
Coalescing layer (filter material): a core element of a coalescing filter element. Small droplets in the gas coalesce into large droplets on the fibers of the coalescing layer.
Draining a liquid layer: this component has a significant impact on filtration efficiency. The drainage layer facilitates the drainage of large coalesced droplets while reducing re-entrainment of the droplets.
Concentration of gas-containing liquid: the number of droplets contained in each cubic meter of gas.
Secondary entrainment: the droplets that have been captured by the coalescing filter reenter the downstream gas stream due to the action of the gas stream, causing an increase in the concentration of droplets in the downstream gas stream, resulting in a decrease in filtration efficiency, a phenomenon that is very likely to occur in micron-sized droplets.
Surface modification treatment: the surface property of the material is changed by a chemical reagent, such as changing the hydrophilic and oleophilic surface into a hydrophobic and oleophobic surface.
Example 1
The present embodiment provides a gas-liquid coalescing filter, which is structured as shown in fig. 2A and 2B, and comprises a filter frame 1 and a filter element wound on the surface of the support frame 1. The profiled fiber pre-separation layer 2 is wound on the surface of the filter framework 1, and the number of winding turns is 1 turn; the profiled fiber aggregation layer 3 is continuously wound along the profiled fiber pre-separation layer 2 for 4 circles; the profiled fiber drainage layer 4 is continuously wound along the profiled fiber aggregation layer 3, and the number of winding turns is 1 turn.
Wherein the average pore diameter of the profiled fiber pre-separating layer 2 is 10 μm, the thickness is 1.5mm, and the shape of the profiled fiber is cross-shaped. The diameter of the profiled fiber used (circumscribed circle diameter) was 15 μm. The pre-separation layer takes polyester fiber as raw material of profiled fiber. The pre-separation layer is obtained by integrally modifying the profiled fibers in modes of needling and the like.
The specific surface area (total area per unit length and unit mass) of the shaped fibers is higher than that of conventional round fibers. Great specific surface area is favorable to increasing the interception of fibre and granule, liquid drop to raise the efficiency, simultaneously, to oleophilic fibre, great specific surface area and fibre surface slot have accelerated the capillary action, and liquid can be faster by the absorption transfer, through carrying out partial modification treatment to filter media, fibre, guide liquid migration promotes liquid discharge, prevents that liquid from being absorbed the back at the inside a large amount of accumulations of filter core.
Wherein, the average aperture of the profiled fiber aggregation layer 3 is 5 μm, the thickness is 0.5mm, the shape of the adopted profiled fiber is cross-shaped, and the diameter (circumscribed circle diameter) of the profiled fiber is 4 μm. The aggregation layer takes glass fiber as raw material of the profiled fiber. The aggregation layer is the special-shaped fiber which is partially hydrophobic and oleophobic and is obtained by carrying out patterning modification on the special-shaped fiber in a series of modes such as dispersion and defibering, pulping and the like.
The specific mode is that the perimeter of the coalescence layer is 5cm along the perimeter direction of the coalescence layer and the perimeter direction of the coalescence layer, and the coalescence layer comprises 4 hydrophobic and oleophobic areas; the total length of the aggregation layer in the winding direction is 50mm, the length of the upper bottom of the upright trapezoid is 13mm, and the length of the lower bottom of the upright trapezoid is 26mm, as shown in fig. 3.
Wherein, the average pore diameter of the profiled fiber drainage layer 4 is 15 μm, the thickness is 2mm, the shape of the profiled fiber is cross, and the diameter (circumscribed circle diameter) of the profiled fiber is 15 μm. The drainage layer takes polyester fiber as raw material of profiled fiber. The drainage layer is a part of hydrophobic and oleophobic profiled fiber obtained by partially modifying the profiled fiber through needling and other modes.
Specifically, the exhaust side surface of the profiled fiber drainage layer is subjected to hydrophobic and oleophobic modification treatment, wherein the thickness of the drainage layer is 2mm in the thickness direction, and the hydrophobic and oleophobic modification thickness of the drainage layer is 2/3mm, as shown in fig. 4.
The comparison experiment is carried out to the shaped fiber gas-liquid coalescence filter of selecting for use this embodiment and traditional gas-liquid coalescence filter, and the filtering quality of this embodiment has obvious promotion than traditional gas-liquid coalescence filter.
The experimental parameters were as follows: the apparent air flow velocity on the inner surface of the filter element is 0.1m/s, aerosol is generated by adopting oil liquid (dioctyl sebacate, DEHS) specified in international test standard EN779, the particle size range of liquid drops in the aerosol at the inlet is 0.3-20 mu m, and the concentration is 480-520 mg/m-3。
The experimental results are as follows: compared with the traditional filter, the pressure drop rises more smoothly, the steady-state pressure drop is obviously reduced, the pressure drop is reduced by about 25 percent (see figure 5), more liquid is discharged from the bottom of the filter in the filtering process, the trapped liquid cannot block an airflow channel, and the service life is prolonged; meanwhile (see fig. 6), in terms of efficiency, the cumulative efficiency near the most penetrable particle size (0.1 μm) is improved from 99.68% to 99.78%, the number of penetrable particles is reduced by 30%, and meanwhile, the cumulative efficiency for large particles above 0.3 μm is 99.95% -99.99%, which shows that the secondary entrainment of liquid drops is effectively reduced.
Example 2
The profiled fibers of the pre-separation layer, the coalescing layer and the drainage layer in example 1 were shaped as trilobes, with the remaining parameters unchanged. The experiment result shows that the pressure drop reduction amplitude is 10%, and the cumulative efficiency near the most penetrable particle size in the aspect of efficiency is improved from 99.48% to 99.82%.
Example 3
In example 1, a coalescing layer having an average pore size of 3 μm was selected, with the remaining parameters being unchanged. The experimental results show that the pressure drop reduction is 15% and the cumulative efficiency in the vicinity of the most permeable particle size in terms of efficiency varies from 99.48% to 99.85%.
Comparative example 1
In example 1, the agglomerate layer was not modified, and the remaining parameters were unchanged. The experimental results showed a pressure drop reduction of 10% and a cumulative efficiency of 99.60% around the most permeable particle size in terms of efficiency.
Comparative example 2
In example 1, a drainage layer with an average pore size of 7 μm was selected, and the remaining parameters were unchanged. The experimental results showed a 5% increase in pressure drop with a cumulative efficiency of 99.58% near the most permeable particle size in terms of efficiency.
Comparative example 3
In example 1, a drainage layer with an average pore size of 25 μm was selected, and the remaining parameters were unchanged. The experiment result shows that the pressure drop is reduced by 5 percent, and the cumulative efficiency of the most penetrable grain diameter in the aspect of efficiency is 99.60 percent.
Comparative example 4
In example 1, the drainage layer was not modified, and the remaining parameters were not changed. The experimental result shows that the pressure drop is reduced by 20 percent, the cumulative efficiency near the most penetrable particle size in the aspect of efficiency is reduced to 99.50 percent, and the phenomenon of secondary entrainment is caused when large liquid drops with the diameter of more than 0.3 mu m appear.
Claims (10)
1. A gas-liquid coalescence filter element comprises a pre-separation layer, a coalescence layer and a liquid discharge layer which are sequentially arranged along the direction of gas flow;
the aperture of the pre-separation layer is 8-12 microns, the thickness of the pre-separation layer is 1-2 mm, the pre-separation layer is formed by profiled fibers, and the whole pre-separation layer has water and oil repellency;
the aperture of the aggregation layer is 3-8 mu m, the thickness of the aggregation layer is 1.6-2.4 mm, the aggregation layer is formed by profiled fibers, and the aggregation layer is divided into a hydrophobic and oleophobic area and a hydrophilic and lipophilic area which are arranged at intervals along the circumferential direction;
the pore diameter of the drainage layer is 10-20 microns, the thickness of the drainage layer is 2-3 mm, the drainage layer is formed by profiled fibers, the drainage layer is divided into a hydrophilic and hydrophilic oil-repellent area and a hydrophobic and oil-repellent area along the thickness direction, the air inlet side is a hydrophilic and hydrophilic area, and the air outlet side is a hydrophobic and oil-repellent area.
2. The gas-liquid coalescing filter element according to claim 1 wherein the pre-separation layer employs shaped fibers having a diameter of 12 μm to 18 μm;
preferably, the diameter of the profiled fiber adopted by the aggregation layer is 3-5 μm;
preferably, the diameter of the profiled fiber adopted by the drainage layer is 12-18 μm.
3. The gas-liquid coalescing filter element according to claim 1 wherein the pre-separation layer is a single layer structure;
the aggregation layer is of a multilayer structure comprising a plurality of sub-aggregation layers; preferably, the coalescing layer consists of 3 to 5 subcondensing layers;
the drainage layer is of a single-layer structure.
4. The gas-liquid coalescing filter element according to claim 1 wherein the vertical cross-section of the hydrophobic and oleophobic area of the coalescing layer is an upright trapezoid; a plurality of hydrophobic and oleophobic areas are arranged at equal intervals;
preferably, the coalescence layer has a perimeter of 5 pi cm to 12 pi cm and comprises 4 to 8 hydrophobic and oleophobic zones;
more preferably, the ratio of the length of the upper base to the length of the lower base of the trapezoid in vertical section of the hydrophobic and oleophobic area is greater than or equal to 1/3 and less than 1, preferably 1/3-3/4.
5. The gas-liquid coalescing filter element according to claim 1, wherein the thickness of the hydrophobic and oleophobic area of the drainage layer is 1/3-2/3 of the total thickness of the drainage layer.
6. The gas-liquid coalescing filter element according to claim 1 further comprising a support matrix overwrapping the pre-separation layer, coalescing layer, and drainage layer.
7. The gas-liquid coalescing filter element according to claim 1, wherein the pre-separation layer is obtained by needle punching or water punching profiled fibers;
preferably, the coalescence layer is obtained by dispersing, defibering and pulping the profiled fibers;
preferably, the drainage layer is formed by needle punching or water punching of profiled fibers.
8. A gas-liquid coalescing filter element according to any one of claims 1 to 7 having a cumulative efficiency of 0.1 μm particles of 99.48% to 99.78%, a reduced number of penetrating particles of 30%, a cumulative efficiency of large particles above 0.3 μm of 99.83% to 99.99%, and a reduced filtration pressure drop of 2 KPa.
9. Use of a gas-liquid coalescing cartridge according to any one of claims 1 to 8 for gas-liquid separation.
10. A filter device comprising the gas-liquid coalescing filter element according to any one of claims 1 to 8.
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| CN109847490A (en) * | 2019-03-20 | 2019-06-07 | 中国石油大学(北京) | A kind of rigidity gas-liquid Coalescence filter core, preparation method and device |
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| CN114950031A (en) * | 2022-05-31 | 2022-08-30 | 华能重庆两江燃机发电有限责任公司 | Directional liquid guiding type gas-liquid separation filter element and working method thereof |
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