JP5084576B2 - Mist filter - Google Patents

Description

  The present invention relates to a mist filter used for separating and removing various mists such as acid mist, oil mist, plasticizer mist, and water mist from gas.

In recent years, mist generated from turbine lubricating oil tanks, oil mist generated from oil splattering during machining and oil mist generated by heat, and deterioration of the work site environment and pollution to the surrounding environment have become environmental problems. .
As means for solving these problems, a method of separating mist by a collision separation method with a collision wall, a coring method using a filter, or the like is disclosed (for example, Patent Document 1).
In such a mist filter, in order to suppress re-scattering of the mist, there has been proposed a method of dropping the mist formed into droplets by changing the density and pore size of the filter layer to form a multi-layered structure (patent) Reference 2). However, dropping the mist with a density gradient into the lower part of the mist did not prevent the separation performance from being lowered due to re-scattering of the mist.

  That is, in a high-performance mist filter using fine glass fibers or the like, the cartridge structure is formed by plates of an adhesive layer that prevents leakage and maintains the form at the upper and lower ends. In this case, the agglomerated and dropletized mist accumulates in the lower part, and is largely pushed outward (downstream) by the air flow and the differential pressure of the cartridge. However, there are many mist aggregates retained in the filter layer. This becomes bubbles due to the flow of air, and re-scattering is induced, resulting in a decrease in separation performance. A suitable method for preventing such re-scattering of the mist aggregation liquid has not been obtained.

JP 2004-255230 A Japanese Patent No. 3278453

  The present invention is a mist filter that separates and removes various mists from gas, and eliminates a decrease in separation performance due to re-scattering of the mist agglomerated liquid, and has a high separation performance and a low pressure loss. It is intended to provide.

As a result of intensive studies to solve the above problems, the present inventors have provided a sheet layer for transporting the mist aggregate liquid to the outside of the outer layer portion of the filter layer comprising the collection layer and the aggregation layer in the mist filter. As a result, the inventors have found that the re-scattering of mist can be prevented and achieved the present invention.
The present invention has the following configuration.
1. A mist filter for separating mist in a gas, comprising a sheet layer for transporting a mist aggregate liquid to a lower part of an outer layer portion of a filter layer including a collection layer and an aggregation layer.
2. 2. The mist filter according to 1 above, wherein the collection layer is composed of a fine fiber layer having a fiber diameter of 0.1 μm to 10 μm, and the aggregation layer is composed of a fiber diameter of 5 to 250 μm.
3. The sheet layer is made of a nonwoven fabric, a woven fabric, a knitted fabric, a mesh-like material, or a film. Or 2. The mist filter described in 1.
4). The above-mentioned 1., wherein the sheet layer is a laminated sheet selected from one or more of nonwoven fabric, woven fabric, knitted fabric, mesh-like product, and film. ~ 3. The mist filter in any one of.

  In the mist filter that separates and removes various mists such as acid mist, oil mist, plasticizer mist, and water mist from the gas, the present invention eliminates the decrease in separation performance due to re-scattering of the mist aggregation liquid, and high separation. It has the effect of having performance and low pressure loss.

The present invention will be specifically described below.
1 and 2 show an example of an embodiment of the present invention. In this example, the gas containing mist is introduced into the cylindrical hollow portion from the lower portion of the hollow cylindrical mist filter, and the mist is separated when passing through the filter layer.
The filter layer includes a collection layer 2 and an aggregation layer 3, and the lower ends thereof are fixed on the plate 8 by an adhesive layer 9. Most of the collected mist is agglomerated into droplets, moves to the lower outer side of the filter layer, and is collected near the upper part of the adhesive layer.
The mist filter of the present invention is characterized in that a sheet layer is disposed on the lower outer side of the filter layer. By this sheet layer, the mist aggregation liquid efficiently moves from the filter layer to the sheet layer, and is further transported to the lower part of the filter. The collected mist aggregation liquid is dropped outside the filter.

By disposing the sheet layer for transporting the mist aggregation liquid at the lower part of the outer layer portion of the filter layer in this manner, the mist aggregation liquid is discharged out of the filter and the aggregation liquid is excluded from the gas flow, thereby preventing mist re-scattering. Can be prevented.
The material for forming the collection layer is not particularly limited, and examples thereof include glass fiber, polyester fiber, polypropylene fiber, nylon fiber, polyphenylene sulfide fiber, polyketone fiber, and cellulose fiber. Glass fiber which is easy to do is preferable. Examples of the form of the fiber layer include woven fabrics, knitted fabrics, and non-woven fabrics, but non-woven fabrics that are bulky and easily form small pore diameters are preferred. Moreover, this collection layer can be formed with what was laminated | stacked cylindrically, and what increased the filtration area by making it a pleat shape. In order to reduce the pressure loss and increase the processing air volume, a pleated structure is preferable. Further, the fiber diameter is preferably 0.1 to 10 μm in order to collect minute mist smaller than 1 μm. More preferably, it is 0.1-1 micrometer. Moreover, the thing in which the thing of the fiber diameter of 1-10 micrometers was contained in what mainly comprised 0.1-1 micrometers may be used.

  The material for forming the aggregated layer is not particularly limited, and examples thereof include glass fiber, polyester fiber, polypropylene fiber, nylon fiber, poniphenylene sulfide fiber, polyketone fiber, and cellulose fiber. In particular, when the mist is oil, polypropylene and polyester are preferable. Examples of the form of the fiber layer include woven fabrics, knitted fabrics, non-woven fabrics, and mesh-like products. These composites and respective laminates can further improve performance. Moreover, the structure laminated | stacked on an outer periphery may be sufficient as a pleat form for overlapping on a collection layer. The fiber diameter is preferably 5 to 200 μm because mist is aggregated. More preferably, it is 10-100 micrometers.

The sheet layer is intended to transport oil to the bottom of the cartridge shape. The material to be formed is not particularly limited, and examples thereof include polyester fiber, polypropylene fiber, nylon fiber, polyphenylene sulfide fiber, polyketone fiber, cellulose fiber, glass fiber, or a film made of these materials. It is preferable that the mist aggregation liquid to be separated is easily retained without being excessively retained. If the mist aggregate is oily,
Polyester, nylon and cellulose are particularly preferred. Examples of the form of the sheet layer include woven fabrics, knitted fabrics, nonwoven fabrics, mesh-like products, and films. The performance can be improved by stacking these composites and double or triple layers of the respective composites. For example, a laminated sheet such as a knitted / nonwoven fabric or a knitted / nonwoven fabric / film further improves the performance.

  The lower part of the filter layer is composed of a plate for fixing the filter medium layer and an adhesive. The sheet layer preferably overlaps the plate portion in order to absorb the liquid accumulated in the aggregation layer and the adhesive and discharge the liquid to the outside of the plate. The width of the sheet layer is not limited as long as it overlaps the plate layer and the aggregated layer, and may cover the front surface of the filter. However, 0.5-5 cm is preferable from the workability at the time of manufacture. More preferably, it is 1 to 3 cm. When a plurality of sheets are used in a stacked manner, the sheet width may be different as long as it does not hinder the transportation of the liquid. In addition, as described above, the sheet layer is provided in the lower part of the outer layer part of the filter layer where the plate part is located, but may be provided in other parts, for example, the upper part of the outer layer part of the filter layer as necessary. it can.

The present invention will be described based on examples.
The evaluation method in the present invention is as follows.
(1) Separation efficiency The turbine oil VG-32 is heated to prepare a gas to be treated having an oil mist concentration of 200 mg / m ³ . The gas to be treated was passed through a mist filter at a flow rate of 340 L / min, and an oil mist separation test was performed. Before and after the mist filter, the number of mist particles was measured by a particle counter (Rion KC-01A), and the separation efficiency of mists of 0.3 μm or more and less than 1.0 μm and 1.0 μm or more was calculated.
(2) Pressure loss The to-be-processed gas similar to said (1) was passed through the mist filter at the flow rate of 340 L / min, and the pressure loss after 16 hours was evaluated.

[Example 1]
The collection layer is mainly composed of 0.3 to 1 μm glass fiber, contains about 10% of 1 to 5 μm glass fiber, and the collection film has a basis weight of 400 g / m ² , and its front and back are made of stainless steel metal fabric. A trapping layer was obtained by sandwiching it into a pleated shape. Next, two layers of a basis weight of 100 g / m ² were wound around the outer side of the collection layer with a polyester fiber nonwoven fabric having a fiber diameter of 15 to 35 μm. Further, 100 g / m ² of a cotton knitted fabric having a fiber diameter of 220 μm was wound around the outside to form an aggregated layer. Based on this, a filter element having an outer diameter of 200 mmφ and a height of 100 mm was produced by a housing, a plate and an adhesive.
Furthermore, as a sheet layer, a polyester spunbond nonwoven fabric having a basis weight of 50 g / m ² slit to 2.5 cm was wound around the lower part of the outer layer of the plate part and the aggregated layer.

[Example 2]
A filter element was produced in the same manner as in Example 1. A cotton knitted fabric (100 g / m ² basis weight) slit to 1 cm as the sheet layer at the bottom, and a polyester spunbond nonwoven fabric (basis weight 50 g / m ² ) slit to 2.5 cm on the outside I wrapped it around.
[Example 3]
A filter element was produced in the same manner as in Example 1.
A cotton knitted fabric (100 g / m ² basis weight) slit to 1 cm as a sheet layer at the bottom, polyester spunbond nonwoven fabric (basis weight 50 g / m ² ) and polyester film (thickness 30 μm) to 2.5 cm The slits were wound around the lower part of the filter with the inside and the outside, respectively.

[Comparative Example 1]
A mist filter obtained by the same production method as in Example 1 was prepared without attaching a sheet layer.
Table 1 shows the separation performance of the mist filters obtained in Examples and Comparative Examples. The mist filter of the present invention can exhibit suitable separation performance by preventing re-scattering of the mist aggregate.

  The present invention is a filter that separates and removes various mists such as acid mist, oil mist, plasticizer mist, and water mist from gas, and eliminates the reduction in separation performance due to re-scattering, and has high separation performance. Moreover, the present invention provides a mist filter having a low pressure loss.

Mist filter overview Schematic diagram of mist collection, aggregation and transport

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mist filter 2 Collection layer 3 Aggregation layer 4 Sheet layer 5 Collected mist 6 Aggregated mist aggregation droplet 7 Liquid to be transported and discharged 8 Plate 9 Adhesive layer

Claims (3)

In a mist filter that separates mist in gas, a trap arranged in the order of a collecting layer composed of a fine fiber layer having a fiber diameter of 0.1 μm to 10 μm and an agglomerated layer composed of a fiber layer having a fiber diameter of 10 to 250 μm in the gas flow direction. has a filter layer comprising a collector layer and the cohesive layer, the filter layer bottom is fixed to the plate, the state overlapping the sheet layer for transporting the mist aggregating agent in the outer layer portion lower portion of the filter layer and the plate with the aggregate layer The mist filter characterized by having in. The mist filter according to claim 1 , wherein the sheet layer is made of a nonwoven fabric, a woven fabric, a knitted fabric, a mesh-like material, or a film. It said sheet layer, nonwoven, woven, knitted, mesh-like material, characterized in that it is a laminated sheet selected from one or more films, the mist filter according to any of claims 1-2.

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