JPH0478405A - Air filter and method for incinerating the filter - Google Patents

Abstract

PURPOSE:To reduce the volume of a spent air filter in a short time by crushing the air filter by a crusher, putting the crushed material into a combustible bag and incinerating the package in an incinerator. CONSTITUTION:The air filter is formed with a filter medium obtained by binding a fibrous material contg. 25-40wt.% glass fiber and 60-75wt.% org. fiber consisting essentially of polyester fiber, a separator made of laminated paper, a sealing material contg. 60-70wt.% urethane resin and 30-40wt.% calcium carbonate, a chloroprene-based gasket, an outer frame of plywood and a metallic screw for fixing the outer frame. The air filter is crushed by a crusher, the crushed material is put into a combustible bag (e.g. PE bag), and the package is incinerated in an incinerator. Consequently, the volume of a spent air filter is reduced in a short time, and a combustible air filter appropriate for the combustion is obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is an incinerator that is used in the exhaust system of a business office that uses a radioisotope or radiation generating device, such as the R1 room of a medical institution. The present invention relates to an air filter and a method of incinerating such an air filter.

(Prior Art) Conventionally, this type of air filter has been made by folding a filter medium made of glass fiber in a zigzag shape, and using a separator with aluminum foil shaped into a wave shape between the folded surfaces so that the filter medium does not overlap. A high-performance ventilation filter, a so-called HEPA filter, is known, which is inserted and sealed within an outer frame via a sealing material.

Since such HEPA filters are nonflammable miscellaneous solids that are difficult to incinerate, they are compressed and reduced in volume after use and stored in drum cans.

In recent years, as the amount of used HEPA filters stored has been increasing, in place of compression volume reduction, incineration volume reduction with a large volume reduction rate is attracting attention. Development of HEPA filter is progressing.

It is.

Such a combustible HEPA filter is cut into a size that can be inserted into the inlet of the combustion furnace of the combustion device and incinerated.

(Problems to be Solved by the Invention) However, the incineration method has a limit in the incineration rate, and the combustible and EPA
The combustion conditions of all of the filters were not necessarily ideal, and in particular, there was a risk that unburned materials could clog the ceramic filter of the exhaust gas treatment dust removal system installed in the incinerator.

The present invention aims to provide an air filter incineration method that does not have such conventional drawbacks and has a good incineration rate, and also to provide an air filter that can be combusted in a good combustion state suitable for processing by such an incineration method. purpose.

(Means for Solving the Problems) The '1s1 invention of the present application is a method for incinerating an air filter that achieves the above object, in which the air filter is crushed in a crusher, and the resulting crushed material is put into a combustible storage bag. It is characterized by storing it in a container and incinerating it in an incinerator.

Further, the second invention of the present application is an air filter that achieves the above-mentioned object, in which a fiber material containing 25 to 40% by weight of glass fibers and 60 to 75% by weight of organic fibers mainly composed of polyester fibers is used as a binder. A bound filter medium, a separator made of laminated paper, and urethane resin 60~
a sealing material composed of 70% by weight and 30 to 40% by weight of calcium carbonate; a carbon-based gasket;
It is characterized by comprising an outer frame made of plywood and metal screws for fixing the outer frame.

To specifically explain the method for incinerating an air filter according to the first invention of the present application, the air filter may be crushed into a square size of about 20 to 5C1 mm, and a size of about 30 mm square is particularly preferable.

A polyethylene bag or the like is used as the combustible storage bag, and preferably has a volume of about 201 cm. Further, it is preferable to maintain the combustion temperature at about 800°C.

Next, to specifically explain the air filter of the second invention of the present application, the glass fiber has a fiber diameter of 0.5 to 2.
A material with a diameter of about 0 μm is used.

The organic fibers mainly composed of polyester fibers may be made of 100% polyester fibers, but may be a mixture of polyester fibers and about 50% recycled fibers such as rayon. In particular, when the amount of glass fiber blended is small, blending recycled fibers is preferable.

Polyvinyl resin is generally used as a binder for binding the fiber material, and is added in an amount of about 7% to the fiber material.

The laminated paper constituting the separator is preferably, for example, a laminated paper in which both sides of a kraft pulp core are laminated with polyethylene films.

Iron screws are preferable as the metal screws for fixing the outer frame.

(Function) The crushed material obtained by crushing the air filter with a crusher has an extremely large surface area and has a high burning rate.Furthermore, it is stored in a flammable storage bag, making it easier to handle and keeping it unburned. It is incinerated in good combustion conditions with no residue left behind.

The air filter constructed as described above is incinerated in particularly good combustion conditions.

(Example) Hereinafter, specific examples will be described.

A filter medium made of 25% by weight of ultrafine glass fibers with a fiber diameter of 1 μm, 50% by weight of polyester fibers, and 50% by weight of rayon bound with a polyvinyl binder is folded in a zigzag shape, and the filter medium is folded so as not to overlap. A separator made of laminated paper shaped into a corrugated shape was inserted between the surfaces, and this was inserted into an outer frame made of plywood through a sealing material composed of 60% by weight of urethane resin and 40% by weight of calcium carbonate. It was sealed, the outer frame was fixed with metal screws, and a chloroprene gasket was attached to the outer frame to create an air filter.

Filter dimensions obtained in this way: 610X610X
When we tested the characteristics of the air filter of 290 (am), we found that the rated air volume was 31m'/tall, and the initial pressure drop was 2511AQ.
The % collection efficiency was 99.97% or more (0.3 μm DOP).

Next, the air filter was crushed using a crusher, and 20 fl
6. Divide each bag into 4 polyethylene bags. 5
When incinerated in an incineration facility with a capacity of X 10' kcal/hr, the volume was reduced to 1/100. Furthermore, when the inside of the incinerator was observed with a video camera, the combustion conditions were good and there was almost no unburnt dust.

Furthermore, although 83 of the polyethylene bags were continuously incinerated, there was no clogging of the ceramic filter of the exhaust gas treatment dust removal system installed in the combustion device. Moreover, the incineration speed was about 1 minute and 9 seconds per polyethylene bag.

(Effects of the Invention) As described above, according to the air filter incineration method of the present invention,
The air filter of the present invention has the effect of reducing the volume of a used air filter in an extremely short period of time, and has the effect of providing an air filter with a good combustion state suitable for the above-mentioned air filter incineration method.

Patent applicant People Japan Inki Co., Ltd. Kitamura Kin ＋＋１□　−φ本 3 other people

Claims (1)

[Claims] 1. A method for incinerating an air filter, which comprises crushing the air filter in a crusher, storing the resulting crushed material in a combustible storage bag, and incinerating it in an incinerator. . 2. A filter material made of a binder made of fibrous material blended with 25-40% by weight of glass fibers and 60-75% by weight of organic fibers mainly composed of polyester fibers, a separator made of laminated paper, and a urethane resin. A sealing material composed of 60 to 70% by weight and 30 to 40% by weight of calcium carbonate, a chloroprene gasket, an outer frame made of plywood, and metal screws for fixing the outer frame. Featured air filter.