JP2013022583A - Air filter medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a plurality of air filters are necessary to set up in open air intake entrances and circulatory systems such as factory air conditioners, building air conditioners or gas turbine power plants, according to each application, therefore a large installation space is needed, a large scale remodeling is needed, and the cost is raised.SOLUTION: The air filter medium is provided which can remove harmful substances such as SOx and NOx, a radioactive iodine and microorganisms such as mold and bacillus, and which can remove them by one air filter medium, and in which the lives of the removal functions for harmful substances and the like are almost the same.

Description

  The present invention relates to an air filter medium for an outside air intake air filter such as a factory air conditioner, a building air conditioner or a gas turbine power plant.

  In general, this type of air filter has a structure in which an air filter medium is folded into a pleated shape in a box-shaped filter frame at the outside air intake port and is airtightly attached with a sealing material, or a feed roll and a take-up roll are opposed to each other. Thus, a roll-up roll air filter provided mainly for winding an air filter medium is mainly used.

  And in these air filters, the air filter medium according to each objective is used. For example, an air filter intended for removal of harmful gases such as NOx, SOx, ammonia, etc. uses a physical adsorption type granular adsorbent or a gas adsorbent formed with an exchange group by adding an acid or alkali component to the material. Filter filters or air filters intended for the removal of radioactive iodine are filters that use an adsorbent made by adding a chemical agent to granular activated carbon or the like, or filter molds or bacteria. As the air filter, an air filter medium using an adsorbent with an antibacterial material attached to the material is used.

  For this reason, if you try to remove each of the outside air intakes and the circulation system in addition to the conventional dust removal, you must install an air filter that uses air filter media with the respective functions, and a large installation space. In addition, it requires a large amount of modification to install, which increases the cost, so it is necessary to give up other functions and install one type of air filter. It was.

  Therefore, the present invention is intended to solve these current situations, and the first object of the present invention is to remove harmful substances, radioactive iodine and microorganisms such as fungi and bacteria with a single air filter medium in the conventional dust removal function. This is what I tried to remove.

  The second object of the present invention is to provide an air filter medium in which the lifespan of collecting and removing harmful substances and the filtering function are almost the same.

  The third object of the present invention is to collect the harmful substance on the surface of the filter base material, and to attach the removal material by an easy processing method, thereby exhibiting a stable removal effect, and collecting on the air filter medium. The present invention provides a high-performance air filter medium having high safety and removal performance without causing harmful substances, radioactive iodine and microorganisms such as mold and bacteria to propagate and re-scatter.

  Next, a fourth object of the present invention is to provide an air filter medium having an inexpensive antibacterial function without requiring special equipment.

  A fifth object of the present invention is to provide an air filter medium that has a compact air filter size, a large processing air volume, and a low pressure loss.

  The sixth object of the present invention is to provide an air filter medium having a long life while being highly efficient.

The seventh object of the present invention is to provide an inexpensive air filter medium.

  The first solving means of the present invention is a harmful gas such as NOx, SOx, ammonia, etc. contained in the gas to be treated on the surface of the filter base material having the ability to remove some harmful substances made of glass fiber, synthetic fiber or natural fiber. Or a layer of a removal material that simultaneously has a function of removing microorganisms such as radioactive iodine and mold and bacteria.

  The second solving means of the present invention is that the removing material layer adhering to the surface of the filter base material is formed by roller means.

  According to a third solution of the present invention, the thickness and type of the removal material layer adhering to the surface of the filter base material are determined according to harmful gases such as NOx, SOx, and ammonia contained in the gas to be treated, radioactive iodine and mold. It was changed according to the kind and amount of microorganisms such as bacteria.

  Here, as a fiber which comprises a filter base material, synthetic resins, such as a polypropylene, polyamide, polyester, polyethylene sulfide, nylon, and fibers, such as a cellulose, a ceramic, and glass, are used, for example. As a class of filter performance, a panel type such as a pre-filter, a roll-up roll air filter, a medium / high performance filter, HEPA, and the like are appropriately applied. For example, in the case of a high-performance filter, it is desirable to mix fibers having a fiber diameter of 20 μm or less, preferably about 5 μm or less.

On the other hand, antibacterial materials such as silver zeolite, zinc zeolite, titanium oxide, copper zeolite, etc., titanium oxide, zinc catalyst, potassium carbonate, potassium hydroxide, amino group, sulfonic acid functional group, chemicals attached to gas removal base material A gas toxic substance adsorbent, povind iodine, and a silver material appropriately mixed are used. A removal material having a similar action is used. The shape of the removal material used in the present invention is preferably powder particles, drug attachment, and ion exchange introduction, and can be appropriately changed according to the type, application, and purpose of the air filter. For example, in the case of a high performance filter, it is desirable that the particle diameter is 10 μm or less, preferably 5 to 0.5 μm. The usage state can be changed as appropriate, such as powder or solution. When dispersed in a dispersion medium, it is used as a 0.005 to 50% concentration solution. Moreover, the adhesion amount of the removal material with respect to the filter base material can be adjusted to 0.3 to 30 g / m ² , preferably 0.5 to 5 g / m ² , and an equivalent amount of 0 to 1 to 5 functional groups. desirable.

  In addition, after attaching the removing material to the surface of the filter base material, the binder used to prevent scattering and peeling and to obtain a high yield is a water-soluble polymer compound, for example, acrylic and Vinyl acetate compounds can be used alone or in combination.

  By the way, as a method of attaching the removing material to the surface of the filter base material, a method in which the roller to which the solution of the removing material is transferred is brought into contact with the surface of the filter base material, a spraying method, a solution impregnation. This is done by adding reactive groups in the treatment. The chemical function is imparted by methods such as drug attachment and graft polymerization.

  For this reason, the removal material adhesion amount and the layer thickness can be changed depending on the gap, time, concentration, etc. with which the roller is brought into contact with the filter substrate surface.

  The air filter is formed by the following method using the air filter medium to which the removing material as described above is attached. That is, after the air filter medium with the removal material attached is dried in the drying process, it is cut to a predetermined size and used as an air filter medium for panel type, roll-up roll air filters, or pleated in a folding machine It is manufactured as a high-performance filter. Alternatively, it is also possible to form the filter base material formed in a pleat shape by adhering the high function removing material and then drying it. In addition, it can be used by being laminated with a conventional dust filter.

  The operation of the above problem solving means is as follows.

  First, the gas to be treated is sucked into the air filter medium by the operation of the air filter. And the to-be-processed gas which passed the air filter filter medium is supplied to a required chamber as clean air. At this time, solid particles contained in the gas to be treated, and harmful substances such as NOx, SOx and ammonia, and radioactive iodine and microorganisms such as mold and bacteria are collected and adsorbed on the air filter medium. Then, harmful substances, radioactive iodine and microorganisms collected on the air filter medium are removed by a binder and a removal material held chemically by the surface of the filter substrate. Thereby, harmful substances are removed by chemical and physical action, and at the same time, radioactive iodine and microorganisms are also removed and used as clean air.

  Furthermore, the layer thickness and amount of the removal material attached to the filter substrate surface can be changed according to the nature and amount of harmful substances, radioactive iodine and microorganisms contained in the gas to be treated. The air filter removal function and the filtration function work well and the service life is almost at the same time, which solves the problem that one of the functions is lost quickly and a new air filter medium must be replaced as before. It is.

  In addition, the frequency of replacement of the air filter is reduced, so that the replacement work is not time-consuming and stable performance can be obtained over a long period of time, which can solve the cost increase.

  In addition, in the case of particulate removal material attachment, the binder is fixed at the center of the surface of the air filter medium on the dust collecting side, so that the particulate removal material does not adhere to the cleaned air discharge side. For this reason, even if a removal material peels from an air filter filter medium, it does not scatter in cleaning air. Therefore, the cleaning air is not contaminated by the removing material.

(1) Capturing harmful substances, radioactive iodine and microorganisms collected on the air filter medium for a long period of time stably by attaching multiple removal materials to the filter base material according to the purpose and amount. Can do. Therefore, harmful substances, radioactive iodine and microorganisms collected on the air filter medium are efficiently collected and removed, and the safety and performance are high.
(2) The layer thickness of the removal material can be changed according to the type, nature, and amount of harmful substances, radioactive iodine and microorganisms contained in the gas to be treated. Since the function life is almost the same, the function of the air filter medium can be fully utilized.
(3) Since the particulate removal material is adhered to the surface of the air filter medium on the dust collecting side and the back base material by transfer of a roller or the like, the air filter can be manufactured by an easy means.
(4) It is possible to provide a low-cost air filter while ensuring attachment of the removing material to the air filter medium.
(5) Since the type, nature, and layer thickness of the removal material are changed on the surface of the air filter medium according to the concentration and concentration of harmful substances, radioactive iodine and microorganisms contained in the gas to be treated, the air filter The pressure loss of the filter medium can be controlled, the clogging inside the air filter medium can be reduced unnecessarily, and the life of the air filter medium can be extended.

It is a perspective view of the antibacterial air filter which shows one Example, and shows what was partially broken. The enlarged view of the X section represented in FIG. It is a perspective view of the antibacterial air filter which shows other examples, and shows what was partially fractured. FIG. 4 is an enlarged view of a Y portion shown in FIG. 3. Schematic which shows the production apparatus of the air filter medium of this invention.

Hereinafter, the air filter medium of the present invention will be described in detail with reference to the drawings.

(Embodiment)
1 and 2 will be described. Reference numeral 1 denotes an air filter medium. The air filter medium 1 is attached to the surface of the filter base 2 with a filter base 2 having a part of gas and microorganisms removed in addition to dust removal made of glass fiber, synthetic fiber or natural fiber. And a removal material layer 3 having a function of removing microorganisms such as harmful gases, radioactive iodine and fungi and bacteria.

  Next, a method for forming the air filter medium 1 by attaching the removing material layer 3 to be attached to the surface of the filter base 2 will be described.

  First, the air filter medium 1 manufacturing apparatus includes a filter base material supply unit 4 in which a filter base material 2 is wound in a roll shape, and a roller 5 for feeding out the filter base material 2 fed from the filter base material supply unit 4 and attachment. A heating device 7 for heating and adhering the filter base material 2 to which the removing material liquid is applied by the roller 6 and the attaching roller 6, and an air filter medium 1 in which the removing material layer 3 having a certain thickness is formed on the filter base material 2 in the heating device 7. It is comprised from the winding roll 8 which winds up.

  Since it consists of such composition, filter base material 2 drawn out from filter base material supply part 4 contacts with attachment roller 6 with roller 5, and a removal material adheres. At this time, the thickness of the removing material layer 3 attached to the filter base 2 is determined by the amount of the removing material transferred to the attaching roller 6 due to the size of the gap.

  Next, a specific structure of the air filter using the air filter medium 1 will be described according to the following examples.

  The case where the air filter medium 1 is used in the automatic winding air filter will be described in detail with reference to FIGS.

  Reference numeral 11 denotes a main body of the take-up roll air filter. In this case, the main body 11 is a vertical U-channel frame with a narrow front and rear width, and its central portion is a ventilating portion having a large opening in the front and rear direction. Yes. A feeding roll 12 and a winding roll 13 are attached to the main body 1.

  The fresh air filter medium 1 fed out from the feed roll 12 is pulled down along the guide rail and taken up by the take-up roll 13.

  14 is a filter base material, and 15 is a silver zeolite layer.

  Next, the case where the air filter medium 1 is used for a box-type unit air filter will be described in detail with reference to FIGS.

  In the figure, reference numeral 21 denotes an outer frame of a box-type unit air filter, which has a box shape with the front and rear surfaces open, and the air filter medium 1 is mounted in the outer frame 21 while being bent in a zigzag shape. That is, as shown in an enlarged view in FIG. 6, corrugated plate-like separators 22 are arranged between the air filter media 1 folded in a zigzag shape, or as shown in FIGS. A string-like adhesive resin 23 is folded between the air filter media 1 which are bent and mounted in a zigzag shape, and a large number of ventilation paths 24 are formed.

  The air filter medium 1 is composed of a nonwoven fabric, glass fiber, a dust holding capacity, a filter base 14 on the downstream side having a large strength, and a layer 5 attached with silver zeolite by a high-performance removal layer attached to the surface of the filter base 14. It is configured.

  It should be noted that the usage mode of the air filter medium of the air filter having the removal function described in the present invention is not limited to the gist of the present invention even if various changes are made only by describing one embodiment.

  The present invention removes solid particles, gaseous harmful substances, radioactive iodine and microorganisms such as mold and bacteria with one air filter medium so that the life of the filter function and the removal function of the air filter medium come almost at the same time. Therefore, it is optimal and useful as an air filter medium for an outside air intake air filter such as a factory air conditioner, a building air conditioner or a gas turbine power plant.

DESCRIPTION OF SYMBOLS 1 ... Air filter medium 2 ... Filter base material 3 ... Removal material layer 4 ... Filter base material supply part 5 ... Roller 6 ... Adhesion roller 7 ... Heating device 8 ... -Winding roll 11 ... Winding roll air filter body 12 ... Feeding roll 13 ... Winding roll 14 ... Filter substrate 15 ... Silver zeolite layer 21 ... Unit air filter Outer frame 22 ... Separator 23 ... String-like adhesive resin 24 ... Ventilation path

Schematic which shows the air filter medium of this invention. Schematic which shows the manufacturing apparatus of an air filter medium. The schematic which shows one Example of an air-filter material, and shows the case where it uses for an automatic winding type air filter. FIG. 4 is an enlarged view of a portion showing the feeding roll portion of FIG. 3. The schematic diagram which shows the 2nd Example of an air filter medium, and shows the case where it uses for a box-type unit air filter. The enlarged view which shows the X section of FIG. Schematic which shows another 2nd Example of an air filter medium, and shows the case where it uses for a box-type unit air filter. The enlarged view which shows the Y section of FIG.

DESCRIPTION OF SYMBOLS 1 ... Air filter medium 2 ... Filter base material 3 ... Removal material layer 4 ... Filter base material supply part 5 ... Roller 6 ... Adhesion roller 7 ... Heating device 8 ... Winding roll 11 ... Winding roll air filter body 12 ... Feeding roll 13 ... Winding roll 14 ... Filter base material 15 ... Silver zeolite layer 21 ... Box-shaped Unit air filter outer frame 22 ... Separator 23 ... String-like adhesive resin 24 ... Ventilation path

Claims (3)

  NOx, SOx, ammonia and other harmful gases such as NOx, SOx, and ammonia contained in the gas to be treated on the surface of a filter base material made of glass fiber, synthetic fiber, natural fiber, etc., which has the ability to remove harmful substances. An air filter medium characterized by attaching or laminating a high-performance removal material layer that simultaneously has a function of removing microorganisms such as bacteria and bacteria.   2. The air filter medium according to claim 1, wherein a layer of a removing material is formed by an attaching roller means.   The thickness of the removal material layer adhering to the surface of the filter base is determined according to the amount, type, and nature of harmful gases such as NOx, SOx, and ammonia contained in the gas to be treated, radioactive iodine, and microorganisms such as mold and bacteria. 2. The air filter medium according to claim 1, wherein the air filter medium is changed according to the conditions.

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