JPH01148321A - Filter charge body for drum-shaped filter casing - Google Patents

Abstract

PURPOSE: To increase the filter area by disposing a specific outflow aperture, providing the top end of a filter element with another holding grids and material layer and compressing these members with an upper cover and a floor part, thereby forming one homogenous body. CONSTITUTION: The filter element 10 is radially arranged via the holding grids 6 in the ring space between cylinders 2 and 3 within the filter inserting body. The top end of the filter element 10 is provided with the filter material layer 16 across the holding grids 17 in addition thereto and these members are compressed by the upper cover 4 and the floor part 5, to form a nearly homogeneous one filter body. The outflow aperture 9 is distributed over the circumferential part of the bed part 5 and is arranged in the region of the outflow chamber of the filter element 10 in proximity to the outer edge 8. Gas to be cleaned enters the filter from a floor aperture 7 and flows through the outflow aperture 14 into an inflow chamber. Next, the gas arrives at the outflow chamber 13 through the filter element 10 and is discharged from the outflow aperture 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a frame consisting of two coaxial cylinders,
Filter elements are arranged in a star shape in the ring space between the cylinders, and the end faces of the cylinders are closed by a cover part and a floor part, and the floor part has an inlet opening in the center. The present invention relates to a filter housing for a V-ram filter casing of the type, in particular for cleaning the exhaust gases of nuclear technology equipment.

Conventional technology process exhaust gases, particularly those from nuclear technology equipment, include wet aerosols and dry airdels. These must be separated and suppressed for environmental protection. For the suppression of wet and dry aerosols, separation filters are used, and efforts are being made to increase the separation efficiency of these filters.

For partial suppression of dry aerosol and wet airdel, square or circular filters filled with glass fibers have been used. For radioactive exhaust gas with a high radioactive inventory, especially in the form of wet airdel and dry aerosol,
For the above reasons, remotely controlled cylindrical shaped filters are used. This filter consists of a substantially ring-shaped fiber filling and a filter frame. The diameter and height of the filter can be chosen arbitrarily. The gas is
It flows into the filter through an opening in one filter end face that is sealed against the filter casing (the other end face is closed with a cover), flows radially through the fiber layer and leaves the filter device. get out. The fiber-filled separator is sloshed with water during operation. As a result, the filter material is partially self-cleaned by washing out the particles that have been contained. This measure extends the life of the filter.

In order to achieve high separation efficiency and keep the pressure drop within the filter low, the gas velocity through the glass fiber packing must vary within certain limits. The maximum amount of gas that can pass through the filter is therefore determined by the given filter area and the permissible velocity of the gas through the filter material. Most known cylindrical fiber-filled separators have only one ring-shaped glass fiber layer. Therefore, the filter area of these separators is very small.

Also, the water nozzle for cleaning the fiber layer is not a component of the filter device.

Problem to be Solved by the Invention The problem to be solved by the invention is to clean exhaust gas from nuclear technology equipment.
The object of the present invention is to provide a particularly suitable filter insert. In this case, a fiber packing is used as the filter material, and the filter packing is compatible with a much larger gas flow rate than a normal fiber-packed separator of the same size, and the tightening is done from a fixed point. It must be thrown with something that does not leak at all.

SUMMARY OF THE INVENTION This object has been achieved by a filter insert of the type mentioned at the outset, which has the features set out in the claims.

Effects of the Invention A filter charge thus constructed can be adapted to process approximately 80 inches more than a conventional fiber-filled separator of the same external dimensions. For a constant gas flow rate to be cleaned, the number of filter units is therefore significantly reduced. A particularly advantageous feature is that no leakage or gas flow occurs in the filter insert, and that the flow passages that penetrate the filter material are tightened even at fixed locations.

Example Next, the present invention will be explained in detail based on the drawings.

Inside the cylindrical filter housing, through which the gas flows in the direction of the arrow 11, there are mainly filter media, namely densely packed glass fibers 1, two coaxial cylinders 2, 3, an upper sealing cover 4, and a floor 5. and a special steel grid 6.

The upper cover 4 sealingly closes the charge body from above;
The floor 5 allows gas to flow in and out. For this purpose, the floor part 5 has an unopened part T as an inlet located in the center and an outflow opening 9 offset towards its outer edge part 8. In the ring space between the cylinder 2 and the yen holder 32, holding gratings 6 are arranged in pairs in a star shape or radially, facing each other almost parallel to each other, and between each pair of gratings there is a Filter elements 10 each consisting of a filter medium 1 are formed.

Inflow chambers 12 are provided between the filter elements 10, respectively.
and outflow chambers 13 are formed alternately. In addition, an outlet opening 9 is assigned to each outlet chamber 13 in the floor 5 so that the gas stream 11 leaving the filter element 10 can be drawn off.

A long slit-shaped inlet opening 14 is arranged in the inlet chamber 12 and is located between two filter elements 10 in each case. For this purpose, the inflow chamber 12 is open towards the interior chamber 15 of the cylinder 2.

Each filter element 10 has a substantially rectangular parallelepiped shape,
Another ring-shaped filter material layer 16 having a predetermined thickness is placed on top of the ring-shaped filter material layer sb, and a holding grid 17 is placed below it. However, the material of the filter element 10 and the layer 16 is compressed by the top cover 4 and formed into a substantially homogeneous body of filter material, so that no phase-wise flow or leakage flow parallel to the retaining grid 17 occurs. Like/do.

A homogeneous star-shaped filter body with an upper cover layer is therefore formed in the inner cylinder 3, which ensures optimum separation without leakage.

The gas to be scrubbed enters through the bed opening T, reaches the interior chamber 15 and flows via the inlet opening 14 into the inlet chamber 12 . From there, the gas passes through the filter element 10 into the outlet chamber 13 and exits the casing via the outlet opening 9.

It is also possible to provide a cleaning device 18, for example a water spray nozzle, in the center of the inner cylinder 2, and the cleaning device 1B sprays water onto the inlet side of the filter element 10 through the opening 14 to clean it. In this case, the cleaning device 18 forms a fixed component of the entire filter insert.

The grating 6 and the grating 17 are all made of special steel, and the filter material itself is compressed gelatin fiber. The filter material is compressed together with the filter element 10 and layer 16 to form a nearly homogeneous filter body, as described above, with the compression force being applied to the desired limit of flow resistance. It is possible to choose to remain within.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view taken along the line A B Ic G in FIG. 2, and FIG. 2 is a sectional view taken along the line CD in FIG. 1. 6 is a perspective view of the filter material, and FIG. 4 is a sectional view when cut along the filter material.
FIG. 1... Filter medium, 2... Inner cylinder, 3... Outer cylinder,
4... Upper cover, 5... Floor, 6... Holding grid, 7... Floor opening, 8... Outer edge, 9... Outflow opening, 10... Filter element , 11...flow direction, 12...inflow chamber, 13...outflow chamber, 14...
- Inflow opening, 15...Inner chamber, 16...Filter material layer, 17...Retaining grid, 18...Washing device. 2 rin of pure ¥! I (No change in content) Bottom... Upper car 2- 10... Filter element 5... Floor part 16... Filter material layer 6... Retaining grid 17... Retaining grid 9.
...Outflow opening 6...Holding grid 9...Outflow opening 10-°°Filter element 13...Outflow chamber 10...Filter element 10

Claims (1)

[Claims] It has a frame consisting of two coaxial cylinders, a filter element is arranged in a star shape in a ring space between the cylinders, and the end surfaces of the cylinders are connected to a cover part and a floor part. Filter inserts for drum-shaped filter casings of the type closed by a floor part and having an inlet opening in the center, characterized in that: a) the outlet opening (9) is closed by the floor part (5); ) distributed over the circumference of the filter element (1) and close to the outer edge (8) of the floor; b) the location of the outflow opening (9)
c) above the filter element (10) or above its upper end, which is arranged in a star shape between the parallel holding grids (6); d) another retaining grid (17) between the upper end of the filter element (10) and said layer (16) of filter material; ) are clamped; e) the filter element (10) is compressed together with the filter material layer (16) and another retaining grid (17) by the top cover (4) and the floor (5); 1. A filter insert for a drum-shaped filter casing, characterized in that the filter insert is formed into one substantially homogeneous body.