KR830002423B1 - High temperature gas filter - Google Patents

Abstract

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Description

High temperature gas filter

1 is a schematic cross-sectional view of a hot gas filter according to the present invention.

2 is an enlarged cross-sectional view of the filter cell of the hot gas filter according to FIG.

3 is a partially exploded perspective view of a filter cell of a hot gas filter according to the present invention.

The present invention relates to a hot gas filter for separating solid materials carried by hot gas and waste gas.

The hot flue gases from incinerators contain a significant amount of suspended solids that are released to the atmosphere. The filter is, among other things, applied to incinerators where radioactive, biological and bacterial contaminated material is combusted. Therefore, in order to avoid contamination of the waste gas system, it is required that the hot flue gas be surely treated immediately after discharge from the incinerator.

However, since flue gas is discharged from incinerators at temperatures between 700 and 1000 ° C., it is difficult to develop a filter having a high temperature, low ventilation loss, a long enough service life and an easily regenerated filter. In hydrodynamic engineering, various solutions using filter cartridges have been tried: a cylinder made of combusted and porous ceramic material in which one end is sealed and the other end is open for the suction of the hot flue gas to be treated. There is a radially protruding flange for holding the filter cartridge inserted into the opening of the lower part of the sieve. However, as the temperature increases, the lower part of the sieve and the size of the opening change, which causes various problems in the sealing portion of the filter cartridge in the lower part of the body. In this case, if a gap and path are formed so that no special seals, such as asbestos cord, are provided, it means that untreated flue gas will penetrate between them. In the filter cartridge as described above means that the flue gas that does not mean to penetrate between them. In such a filter cartridge, a high-capacity waste gas fan is required because the ventilation loss such as an unexpected pressure drop is very large. Moreover, the removal of solid particles attached to the porous walls makes the cleaning and regeneration of the filter cartridges rather difficult and the old used filter cartridges are relatively heavy even if they are compressed. Last but not least, these filter cartridges-especially near the radial flanges-are very sensitive to mechanical forces and deformations. For the reasons specified above, there is a great need for a hot gas filter that has all the problems addressed.

Thus, the present invention ensures high filter effect, low ventilation loss and long enough service life, while at the same time separating solid particles carried by hot or flue gas, which allows easy and quick reproduction without any risk of personal operation. It is about a filter.

The purpose is achieved by at least one rectangular filter cell of a heat resistant brick mounted on a filter case where one end of the filter cell is terminated in a hot gas supply pipe and the other end is tightly sealed by a movable cover device such that at least a portion of the filter cell is porous. The hot gas introduced into the filter cell, made of brick, enters the treated gas discharge conduit by passing through the filter hose of the filter cell, the entire length of which is embedded in a heat resistant textile fabric or tissue. In contrast to brittle ceramic filter cartridges, the filter material of the proposed heat resistant fabric easily supports any gunshot or shooting. The use of a hose-type filter material with an open inlet end only ensures that the hot gas entering the filter cell penetrates the filter hose in any case before exiting the filter cell, and filters through any gaps present in the brick material. The spill of material is removed in this case.

In addition, the installation, fastening and sealing of the filter material is considerably easier than the ceramic filter cartridge due to the fact that the filter hose itself is used for sealing and the hose material is easily recovered from thermal expansion. Other advantages include the relatively inexpensive value of the filter hose material and the reduced weight and waste volume of the spent filter hose.

It is preferable that the filter cell is arranged vertically and the hot gas supply line ends at the bottom of the filter cell. The filter hose is suspended in the filter cell and uniformly embedded in the filter cell wall-with the aid of an induction blower connected to the waste gas system.

The filter case is installed with a high temperature heat-resistant material to withstand the maximum heat resistance and to withstand the erosion caused by erosion acids formed from heating gas and air humidity components during the stop cycle in the filter. It is preferable that the long wall of the filter cell is made of porous bricks. In principle, even if a rectangular filter of any cross section is used, the filter cell of the rectangular cross section is best made of brick.

In this case too, it is advantageous to insert the pore brick into the slit of the filter case rather than to intergrate as a brick of the filter case. In this way, the porous bricks can be removed or replaced if necessary. The use of a fully sealed filter hose ensures that untreated hot gas does not leak through the slots and the porous walls.

In order to introduce the hot gas into the largest possible part of the filter hose, it is required to make the porous wall on the side of the filter cell have a suction shape extending from the hole to the hole. In so doing, hot gas enters the filter hose directly as well as the hole in the porous wall.

The lower end of the filter cell is preferably narrowed slightly in the outflow direction of the supplied hot gas. It also causes the filter hose on the conical bottom face of the filter cell to be pressed against the filter cell by means of a suitable ring-shaped stress device.

It is desired to use a force device made of a high temperature heat resistant ceramic material having a coefficient of thermal expansion corresponding to the peripheral wall. In this way, any losses that may be caused by the metal stress device, such as damaging the peripheral section of the filter cell as a result of the high coefficient of thermal expansion, are prevented.

Unlike the filter cell in the narrowed inlet stage, the cross section remains unchanged with respect to the electrical transition, cascades the inlet end of the filter cell inserted into the hot gas supply conduit, and the inlet of the filter hose inserted into the filter cell. It is also possible to design the filter cell by cascading the end and placing the inlet end of the filter hose inserted into the filter cell on the modified step.

In a preferred example of the invention a corresponding filter cell bore longer filter hose is provided. After inserting the filter hose into the filter cell, the protruding top of the filter hose is folded over the filter case and pressed by the drawn flange of the heat resistant closed brick used as the cover. By simply removing the sealed brick, a quick and easy access to the filter cell is ensured, while at the same time the protruding and folded back end of the filter hose prevents untreated hot gas from being discharged from the closed end of the filter cell.

When considering the rectangular shape of the filter cell, building a flexible filter hose can cause several problems. In the present invention, the filter hose is applied to a cartridge case made of a solid cardboard material or the like, which is open at both ends, whose shape and size correspond exactly to the filter cell, and burns without substantially leaving any residue. Solved the problem.

The filter hose applied to the cartridge case forms a filter cartridge that is easily installed, rigid and self-supporting.

After installation, the cardboard material forming the filter cartridge burns as soon as the filter is operated, and the remaining filter cell hose is operated with sufficient efficiency in a short time.

From the outset, it is required to provide porosity to the cartridge case to ensure better gas flow in the filter cell and in this way to accelerate the incineration of the cartridge case.

If several filter cells are arranged in parallel in the filter case, the treated gas conduits need to extend between each of the two neighboring filter cells. This treated gas conduit will usually end in the treated gas exhaust conduit.

At the inlet, the filter cell is also usually terminated in a hot gas distribution chamber and the lower part of the latter is designed like an asheet wrap to accumulate all residues from the filter cell and serves as an outlet wrap for intermittent waste.

In the case of contaminated residue, the discharge flap will be implemented as a discharge wheelset in such a way that the drums for transportation and storage of the residue are mated in a reliable application and not touched by the operator. After the specified use time of the filter hose has passed, the filter effect is reduced. The filter hose is simply pushed to the inlet side of the filter cell by removing the enclosed brick and then discharged through the agitator wrap.

In particular, in the case where the solid substance to be filtered is radioactively contaminated, as a preferred example of the present invention, the filter hose used is sealed in the filter case directly through the filter cell and simply discharged into a mating drum to safely replace the filter hose. Can be. In this way, contaminated residue or parts of the filter hose cannot be released to the atmosphere during filter hose change.

During long run cycles, cracks occur in the filter case walls due to thermal expansion. In order to prevent untreated hot gases from penetrating from the hot gas inlet to the discharge through these cracks, the filter case brick between the hot gas side and the treated gas side is not subject to any cracks due to its high elasticity. It is preferable to use a filter mass made of the same material as the filter hose.

The filter hose is preferably made of a ceramic fiber fabric which is a sufficient heat-resistant material within the temperature range used, but it is stable even in the required processing time if long ceramic fibers are used.

Optionally, the filter hose may be made of a jeep corn fiber fabric stabilized with yttrium oxide. The heat resistance and usable life of these fabrics is significantly greater than that of ceramic fiber fabrics. But the price of these fabrics is also quite expensive. The filter according to the invention is illustrated by the following specific example with reference to the accompanying drawings.

The hot gas filter 10 shown in the drawing is a general hot gas distribution chamber 18 into which a hot gas generated in an incinerator or a reactor flows through a supply conduit 20, which is generated in an incinerator or a reactor through a supply conduit 20. 4 shown in detail in the multiple-drawings arranged in parallel at the same distance inside the case, the lower end of which is connected to the distribution chamber via a common hot gas distribution chamber 18 and a gas supply conduit 16 through which hot gas is introduced. It consists of a filter case (2) made of a heat-resistant wall with a vertical, rectangular filter cell (14). The narrow end of the hot gas distribution chamber 18 is designed as an acitre wrap of the filter 10 to deposit a residue consisting of fresh solid material and other residues from the filter cell 14.

The discharge of the residue 22 is intermittent, closed type designed as a transfer key that is secured with a herm-etical seal and mated with a waste drum before the flap is opened to prevent the release of contaminated filter residue from the hot gas filter 10. By waste flaps 24, contrary to the first view. The filter cell 14 is embedded in a filter hose 26 made of ceramic fabric fiber or other heat resistant fiber, and the upper end of the filter hose is longer than the length of the filter cell so as to surround the outer rice. The sealed brick 30 partially introduced into the filter cell is a protruding end of the cover flange 32. In the case of the bent top end 28 of the filter hose, the sealing of the filter cell is ensured.

As most clearly shown in FIG. 3, the filter cell 14 is a rectangular cross-section and the wall forming the longer portion of the right angle is inserted perpendicular to the slot 36 in the brick ash of the filter case 12 and ultimately The porous wall 34 of the multi-hole 35 is erected, which can be quickly and easily replaced in case of loss. The lower gravel 34 is on the horizontal wall 38 of the filter case 12 with an intermediate layer of filter material interposed therebetween. The outer wall of the perforated brick 34 is processed in parallel to the filter cell, ending in a general treated gas conduit 44 (not shown directly in the drawing) that delivers the treated gas to a continuous location in the waste gas system. A gas conduit 42 is formed. The wall surface of the porous brick 34 attached to the filter hose 26 in order to ensure hotter hot gas suction in the filter hose 26 has a groove 46 in each hole 35 (FIG. 3). Should be

The lower end, that is, the suction end 48 of each filter cell is slightly narrowed in the outflow direction, and the filter hose is attached closely to the surrounding wall at this part. In addition, a correspondingly formed ring stress device 50 has been introduced into the filter hose 26 such that the appropriate weight of the surrounding wall presses against the bottom of the filter hose. This stress device 50 is made of a heat-resistant ceramic material having the same thermal expansion coefficient as the surrounding material of the filter case 12 to avoid loss of the stress device or filter case due to other thermal expansion coefficients. To facilitate the installation of the filter hose 26, in particular to avoid their attachment to the walls of the filter cell 14, the filter hoses are made of cardboard for device installation purposes and correspond precisely to the shape and size of the filter cell 14. The filter cartridge 52 is stuck. The cardboard material used for the cartridge case 52 is porosity and should be burned without any residue at the temperature of the filter. In addition, the removal of the old filter hose simply lifts the sealing wall 30 and pushes the filter hose into the hot gas distribution chamber and the seat wrap each through the hot gas supply conduit 16 as a suitable extension.

The maintenance of the hot gas filter and the quick and easy exchange of the filter hose according to the present invention are certain in this way. Detailed description of the invention within the scope of the present invention may be modified or improved. For example, such a modification relates to the number of cross sections and arrangements of the filter cells inside the filter case.

Unlike the ceramic fiber fabrics specified, the fabrication of a zircon oxide fiber fabric stabilized with filter hose yttrium oxide guarantees a very long service life but is also quite expensive.

Due to the easy and quick way of changing the filter hose described above, the ceramic fiber fabrics specified so far are better than any other material.

Claims (1)

One rectangular filter cell, one end of which is terminated in the gas supply conduit 16 and the other end of which is tightly sealed by an easy-to-remove cover (e.g., a sealing brick 30), built on a filter case 12 made of heat-resistant brick. (14), the filter hose (26) in which the hot gas introduced into the filter cell (14) through the wall of the filter cell (14) made of at least a portion of the porous brick (34) embedded in a heat resistant fabric or tissue A hot gas filter for separating solid particles carried by hot gas or waste gas, which is to be sent to the treated gas discharge conduit 44 by passing the in-filter cell 14 through a wall.

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