CN1015220B - Filter element in filter shell of boiler - Google Patents

Abstract

Filter cartridge for boiler filter housing, in particular for purifying vent gases of nuclear installations. Above the filter elements (10) arranged radially between parallel retaining grids (6), or their upper ends, a further annular layer of filter material (16) of a specific thickness is located. The filter elements (10), together with the layer of filter material (16) and the additional retaining grid (17), are pressed together by the upper cover (4) and the bottom (5), and form a roughly homogeneous body.

Description

Filter element in filter shell of boiler

The present invention relates to the filter element in a kind of filter shell of boiler, relate in particular to a kind of filter element that purifies nuclear device waste gas, this filter element has a framework of being made up of two coaxitrons, the there filtering element becomes in the annular space be placed in radially between the above-mentioned two tubes, seals with a top cover and a bottom at the two ends of these two coaxitrons.

The waste gas of waste gas aborning, especially nuclear device contains suspended particle wet or that do.In order to protect environment, they must be separated and be reclaimed.Adopted the filtrator of high score from coefficient arranged for holding back suspended particle wet or that do.

Can adopt rectangular parallelepiped or the cylindrical filter that is filled with glass fibre for holding back suspended particle wet and that a part is done.For radioactive emission with big radioactive dosage, especially have the radgas of big radioactive dosage with suspended particle form wet or that do, consider to adopt cylindrical filter from the remote control angle.This class filtrator is made up of filter frame and a fiberfill that is substantially annular.The diameter of filtrator and highly can selecting arbitrarily.Gas stream through with filtrator end face that filter head housings seals mutually on opening (its another end face is sealed by a top cover) and enter in the filtrator, radial flow is crossed fibrage again, leaves this filter element.To fiberfill separation vessel spray water, therefore by washing the particle of having held back, filtering material itself can partly purify in operational process.By means of this measure, can prolong the life-span of filtrator.

In order to obtain high separation coefficient and to make the pressure loss in the filtrator remain on a less value, the movement velocity that air communication is crossed fiber glass packing should be limited in certain scope.Operational filtering surface and the gas that is allowed have determined to pass through the maximum gas flow of this filtrator by the flow velocity of filtering material.Most of known fiberfill separation vessels have only one deck ring-type glass layer.Therefore the filtering surface of this separation vessel is very little.Be used for washing the part that fibrolaminar spray nozzle neither filter element.

Task of the present invention provides a kind of filter element that is specially adapted to purify nuclear device waste gas.This filter element adopts fiberfill to be used as filtering material, compares with onesize universal fibre filler separation vessel, and it is applicable to quite high volumetric flow of gas situation, and does not have airflow leakage at the clamped position place.

In order to finish above-mentioned task, solution of the present invention is: begin in the described the sort of filter element of part at this paper, the air-flow escape hole is distributed in the circumference range of bottom, near the bottom outer rim, its position going out in the fluid space zone between filtering element, become radial setting, above the filtering element between the parallel supportive grid, the top of its upper end also is provided with another more precisely certain thickness ring-type filtering material layer; Between the upper end of filtering element and filtering material layer, a supportive grid has been installed also; By upper top cover with go to the bottom filtering element caught up with and state filtering material layer and another piece supportive grid is pressed together, constitutes a uniform substantially filtering bodies.

The universal fibre filler separation vessel that the volumetric flow rate of this structure filter element is more identical than physical dimension is big by about 80%.Therefore, give regularly when the volumetric flow rate of fluid to be clean, the quantity of filter unit can significantly reduce.At last, the outstanding especially advantage of this filter element is wherein airflow leakage can not occur, and when clamping air communication to cross the gas channel of filtering material very wide.

1-4 is described in further detail the present invention with reference to the accompanying drawings below.

Fig. 1 is along the cross-sectional view of A-B line among filter element Fig. 2;

Fig. 2 is the sectional view of Fig. 1 along the C-D line;

Fig. 3 is the skeleton view of filtering material;

Fig. 4 is the parts explosion of Fig. 3.

Air-flow is mainly promptly filled out tight glass fibre by filtering material 1(with the cylindrical filter element that arrow 11 directions flow through), two coaxitrons 2 and 3, upper top cover 4 and bottom 5 and high-quality steel supportive grid 6 form, upper top cover 4 seals up filter element from top, and air communication is crossed bottom 5 and flowed into or flow out.For this reason, there is a bottom opening 7 as air flow inlet the centre of bottom 5, near bottom outer rim 8 air-flow escape hole 9 is arranged.In the annular space between the pipe 2 and 3 starlike or radial supportive grid 6 is housed, parallel to each other in pairs, laid the filtering element of making by filtering material 1 10 between every pair of grid.

Form going into fluid space 12 and going out fluid space 13 of air-flow between the filtering element 10 alternately.Air-flow escape hole 9 just is arranged on the bottom 5 and goes out fluid space 13 corresponding parts with each, thereby the air-flow that will flow out from filtering element 10 11 is discharged.

Going into fluid space 12 has longitudinal slot shape air flow inlet 14, pipe 2 wall in it passes between two filtering elements 10, thereby go into fluid space 12 and communicate with the inner space 15 of interior pipe 2.

Also be placed with one above the filtering element 10 in each that is substantially rectangular parallelepiped and have certain thickness ring-type filtering material layer 16, a tinsel grid 17 also can be set below this filtering material layer.Filtering element 10 and filtering material layer 16 are pressed together by upper top cover 4, thereby form an isotropic body of being made up of filtering material, and can not produce the crossflow seepage in the direction parallel with metallic grid 17.

Thereby, form a radial filtering bodies homogeneous, that have the top seal layer at outer tube 3, thereby guarantee to finish leak free optimal separation.

The gas that purifies enters pipe 2 inner space 15 from bottom opening 7, and flows to into fluid space 12 by air flow inlet 14, and gas passes filtering element 10 therefrom, arrives out fluid space 13 then, discharges housings through air-flow escape hole 9 again.

In the centre of interior pipe 2 cleaning device 18 is housed also, spray nozzle for example, it carries out purge or cleaning by the inflow side of 14 pairs of filtering elements 10 of air flow inlet.Therefore, this cleaning device is the fixedly ingredient of whole filter element.

All grids 6 and 17 are made by the high-quality steel, adopt as filtering material itself and fill out tight glass fibre.As said mistake, by filtering element 10 and filtering material layer 16 are pressed together, filtering material becomes a filtering bodies uniformly substantially, and institute's applied pressure is selected to such an extent that the air current flow resistance is remained in the desirable scope when compressing.

Description of reference numerals:

1. filtering material 11. air current flow directions, air-flow

2. inner tube 12. enters fluid space

3. outer tube 13. goes out fluid space

4. upper top cover 14. air flow inlets

5. 15. inner spaces, bottom

6. supportive grid 16. filtering material layers

7. bottom opening 17. tinsel grids

8. outer wall 18. cleaning devices

9. air-flow escape hole

10. filtering element

Claims (1)

1. Filter element in the filter shell of boiler particularly purifies the filter element of nuclear device waste gas,

   A) by a framework of forming by two coaxitrons,

   B) filtering element becomes in the annular space be arranged in radially between above-mentioned two pipes,

   C) two ends of coaxitron are sealed by a top cover and a bottom respectively,

   D) there is an inlet Di Bu centre,

   It is characterized in that:

   E) by upper top cover and bottom filtering element is pressed together with filtering material layer and another piece supportive grid,

   F) air-flow escape hole (9) is distributed in the periphery of bottom (5) and penetrates the bottom,

   G) position of air-flow escape hole (9) goes out fluid space (13) zone between filtering element (10),

   H) become radial arrangement, be positioned at the top of the filtering element (10) between the parallel supportive grid (6), the top, end has been laid another and has been had certain thickness filtering material layer (16) thereon or rather,

   I) between the upper end of above-mentioned filtering element (10) and filtering material layer (16), another piece supportive grid (17) is housed.

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