KR100988891B1 - Combination type gas filter - Google Patents

Abstract

The present invention relates to a combined gas filter device comprising a pleated filter bag, a catalyst filling part and a catalyst, and more particularly, a pleated filter bag having an open top and a closed cylindrical shape having a closed cylindrical shape. It is a porous cylindrical frame of the hollow cylindrical form, it relates to a combined gas filtration device consisting of a high-density pellet-type nitrogen oxide reduction catalyst filled in the catalyst filling unit having a separate filling space and the filling space of the catalyst filling.

By using the combined gas filtration apparatus of the present invention, dust filtration and reduction of nitrogen oxides can be simultaneously performed without changing the additional equipment of the dust collector, and do not require the heating apparatus required for the conventional nitrogen oxide reduction apparatus. The hot gas can be filtered and reduced immediately. Therefore, it is possible to simplify the installation, reduce the manufacturing cost, and increase the energy efficiency.

Pleated filter bag, high strength pellet type, nitrogen oxide reduction catalyst, catalyst,

Description

Combined Gas Filtration Unit {COMBINATION TYPE GAS FILTER}

The present invention relates to a combined gas filter device comprising a pleated filter bag, a catalyst filling part and a catalyst, and more particularly, a pleated filter bag having an open top and a closed cylindrical shape having a closed cylindrical shape. It is a porous cylindrical frame of the hollow cylindrical form, it relates to a combined gas filtration device consisting of a high-density pellet-type nitrogen oxide reduction catalyst filled in the catalyst filling unit having a separate filling space and the filling space of the catalyst filling.

In general, in a combustion device such as an automobile, a petrochemical plant, and a large power plant, a selective catalytic reduction (SCR) catalyst is used to remove NOx, which is a nitrogen oxide, from the combustion gas generated during the combustion process. Doing.

Since these catalysts are expensive, in order to reduce their clogging and allow sufficient reduction reactions, the removal of nitrogen oxides and dust generated during combustion should be carried out as well. Therefore, in general, dust is first removed using a bag type dust collector equipped with an electric dust collector or a filter bag as a primary, and a honeycomb type SCR catalyst (Selective Catalytic Reduction) is used to remove the filtration gas in a separate reactor. It is reacted with ammonia gas and reduced with a catalyst.

At this time, due to the heat resistance problem of the dust collecting filter, it is common to pass the gas through a separate cooling device so that the temperature of the gas is 130 ° C or less before the high temperature dust collecting gas is introduced into the dust collecting facility.

In addition, the honeycomb type SCR catalyst generally used has a nitrogen oxide removal rate of 90% or more when the reduction reaction temperature is 350 ° C. or higher, and a dust collector using a filter bag uses a high temperature filter bag. Even in this case, it is difficult to use at a temperature of 200 ° C. or higher, so that a separate temperature raising device is required between the dust collector and the catalytic reactor.

That is, the conventional NOx gas filtration device should be composed of two stages of the dust collector and the reactor, as well as having to pass through the separate cooling device before the hot dust gas is introduced into the dust collector, The flue gas filtered off the dust had to be passed through a separate heating device again to react with the catalyst at a sufficient temperature in the reactor. Therefore, there are various problems such as complicated equipment, increased cost, and low energy efficiency.

Therefore, research has been made on filter bags (patent registration number: 10-769319) or low-temperature SCR catalysts that can be used at relatively high temperatures, but when applied to them, it is impossible to utilize the existing filtration facilities. Due to the problem of using the existing facilities as it was.

Therefore, while solving the problems of the existing filtration device that required a two-stage equipment and a separate temperature control device of the dust collector and the reactor, it is possible to use the existing equipment as it is, a new type of gas filtration device that can reduce the equipment cost Was urgently required.

It is an object of the present invention to simultaneously filter and reduce high-temperature gas without the need of a temperature control device required for a conventional nitrogen oxide gas filtration device, which can bring about equipment simplification, manufacturing cost reduction, and energy efficiency improvement. It is an object to provide a combined gas filtration device.

An object of the present invention is to provide a combined gas filtration device that can utilize the dust collector used in the conventional nitrogen oxide gas filtration device without additional device change to reduce equipment removal and installation costs.

The object of the present invention is achieved by providing a combined gas filtration device consisting of a pleated filter bag, a catalyst packing and a catalyst.

In addition, the object of the present invention is achieved by providing a combined gas filtration device, characterized in that the pleated filter bag has an open top and a closed cylindrical shape.

In addition, the object of the present invention is achieved by providing a combined gas filtration device, characterized in that the catalyst filling unit is a porous frame of the hollow cylindrical form coupled to the interior of the pleated filter bag, the interior has a separate filling space. .

In addition, the object of the present invention is achieved by providing a combined gas filtration device, characterized in that the catalyst is a high-intensity pellet-type nitrogen oxide reduction catalyst filled in the filling space of the catalyst filling unit.

By using the combined gas filtration device of the present invention, even without the temperature control device (heating device) required for the conventional nitrogen oxide gas filtration device, the filtration of high-temperature combustion gas in an environment of about 200 ° C., which is a relatively low temperature range, and Since the reduction can be performed at the same time, the equipment can be simplified and the manufacturing cost can be reduced, and the energy efficiency can be improved.

In addition, the catalyst of the present invention is easy and inexpensive to manufacture, compared to the conventional honeycomb type catalyst, it is easy to exchange the catalyst to reduce the manufacturing cost, it is possible to increase the purification efficiency by minimizing the air resistance.

In addition, it is possible to use the existing equipment using the conventional fiber filter bag as it can bring the effect of reducing the removal and installation cost of the equipment.

Hereinafter, the combined gas filtration device of the present invention will be described in detail with reference to the accompanying drawings.

The combined gas filtration device of the present invention includes a pleated filter bag 10, a catalyst filling unit 20 coupled to the pleated filter bag 10, and a catalyst 30 filled in the catalyst filling unit 20. It consists of a combined gas filtration device.

The pleated filter bag 10 has a shape similar to that of a conventional filter bag, since the filter bag 10 can be directly installed or minimized without having a separate device where a conventional filter bag is used. That is, the upper part is open and the lower part has a cylindrical shape which is closed.

The cylindrical shape is 1) the circumferential portion 12 of the woven or non-woven filter media (filter media) and the lower portion 14 of the cap (cap) structure is combined or 2) woven or non-woven media (filter media) Consisting of, the circumferential portion 12 and the lower portion 14 may be integrally sewn. 1 and 2 is an embodiment of the form in which the circumference and the lower portion is coupled, Figure 3 is an embodiment of the form in which the circumference and the lower portion is integrally sewn.

First, looking at the form in which the circumferential portion 12 made of the woven or nonwoven filter media and the lower portion 14 made of a cap structure are combined,

The woven or nonwoven fabric used in the cylindrical filter media corresponding to the curved portion in the cylindrical shape should be a material capable of operating at a temperature at which the reduction reaction of the reduction catalyst can be sufficiently performed, preferably 120 to 200 ° C., More preferably, it may be a high temperature woven or nonwoven media capable of operating at 160 ° C. Such a high temperature dust cartridge filter bag may be manufactured by referring to the method disclosed in the manufacturing method of the high temperature dust cartridge filter of the applicant's patent registration No. 769318.

In addition, since the combustion gas discharged from the dust collecting facility often contains sulfur oxides or other highly corrosive by-products in addition to nitrogen oxides, in order to improve chemical resistance and heat resistance, the filter media is 1 to 5 deniers. A web having a weight of 200 to 400 g / m ² made of high temperature short fibers (PTFE, polyaramid, polyimide, polysulfonamide or glass fiber, etc.) of 300 to 1000 denier of 200 to 400 g / m ² It may be a binding cloth (two or three ply) media combined with needle punching on one or both sides of the weight of E-glass fabric. The manufacturing method of the pleated filter bag as described above may be applied to the manufacturing method of the high-temperature dust-collecting cartridge filter of the applicant's patent registration No. 769319 described above.

At this time, the web is a high temperature short fiber selected from a) 1 to 5 denier PTFE (PolyTetra Floro Ethylene) short fibers and b) 1 to 5 denier polyamide, polyimide, polysulfoneamide and glass fiber 70: It is preferable to mix and manufacture 30-30: 50, and to improve heat resistance, chemical resistance, and corrosion resistance with improvement of bending performance.

As shown in FIG. 1, the circumferential portion 12 may be a bent cartridge filter in which a heat resistant resin is impregnated and dried in a nonwoven filter media manufactured by a spunlace method using high temperature fibers.

The high temperature fiber is not particularly limited as long as it is a fiber having heat resistance, and preferably may be any one selected from polyamide, polyimide, polysulfonamide, PTFE (PolyTetra Floro Ethylene), and polyphenylene sulfide (PPS). In order to increase the filterability of the filter, the surface of the filter may further have a small processed surface or a PTFE (PolyTetra Floro Ethylene) membrane.

In addition, the bent cartridge filter of FIG. 1 may be a bent cartridge filter in which the heat-resistant resin is impregnated and dried in a nonwoven fabric filter media made of glass fibers, and the filterability of the filter on the filter surface In order to increase, it may further have a woolen surface or a polytetra fluoro ethylene (PTFE) membrane.

For a more detailed method of manufacturing the bent high temperature dust cartridge filter as described above can be referred to the Patent No. 769318 of the applicant.

On the other hand, as shown in Figure 2, the circumferential portion 12 may be a cylindrical filter made of a woven or non-woven filter media (filter media) made of a high temperature fiber, even if the high temperature fiber is a fiber having heat resistance It is not particularly limited, and may be any one selected from polyamide, polyimide, polysulfonamide, PolyTetra Floro Ethylene (PTFE), Poly Phenylene sulfide (PPS), and glass fibers.

In addition, in order to increase the filterability of the filter on the surface of the filter may further have a woolen surface or PTFE (PolyTetra Floro Ethylene) membrane, specific examples thereof are E-glass fabrics bonded with PTFE membrane, P84 needle felt, PSA needle felt, PPS needle felt, etc.

The cylindrical shape of the pleated filter bag 10 may have a second shape in which the circumferential portion 12 and the lower portion 14 are integrally sewn as shown in FIG. 3. At this time, the entire cylinder of the pleated filter bag should be made of a material that can be operated at a temperature capable of sufficiently reducing the reduction catalyst, preferably for a high temperature that can be operated at 120 to 200 ℃, more preferably 160 ℃ This may include woven or nonwoven media made of fibers.

In this case, the high temperature fiber is not particularly limited as long as it is a fiber having heat resistance. Preferably, the high temperature fiber is selected from polyamide, polyimide, polysulfonamide, PTFE (PolyTetra Floro Ethylene), PPS (Poly Phenylene sulfide) and glass fiber. It can be either. In addition, the filter surface may further have a woolen surface or a PTFE (PolyTetra Floro Ethylene) membrane to increase the filterability of the filter.

Meanwhile, the catalyst filling part 20 of the gas filtration device of the present invention is a hollow cylindrical porous frame coupled to the inside of the pleated filter bag 10 as shown in FIGS. 1 to 4. Inside, there is a separate filling space 22.

At this time, the outer shape is cylindrical (preferably having an outer diameter corresponding to the inner diameter of the pleated filter bag) so as to support the pleated filter bag well, and has a hollow cylindrical shape to distribute the catalyst evenly with a uniform thickness. In order to minimize the pressure loss due to the dust collector, it is composed of a porous frame.

Preferably, in order to ensure heat resistance, corrosion resistance and chemical resistance, the catalyst filling part 20 is preferably made of stainless steel or galvanized steel having a hollow cylindrical shape, and has a porosity of 50% to 80 to reduce pressure loss. It is preferable that it is a steel plate which has a porous part of%, and a network structure (mesh type etc.). As an embodiment, the catalyst filling unit may be a perforated plate shape having a hole as shown in the right side of Figure 4, the hole may be formed in various shapes such as triangular, square, pentagonal, hexagonal.

The radial thickness t of the catalyst packing 20 is preferably 5 to 25 mm because it can maximize the purification efficiency while minimizing pressure loss when applied to a conventional 2m pleated filter bag.

In this case, in order to facilitate the filling of the catalyst and to prevent the catalyst in the form of pellets from being severely pressed in the lower portion, the catalyst filling part may further include a partition separating the catalyst in the longitudinal direction, or as shown in FIGS. 1 and 2. It is preferable to configure the frame in a stacked form.

Specifically, in the case of applying this to a 2m pleated filter bag, the basic length of the catalyst filling part may be 25 or 50 cm, and these may be combined and used by adhesive or welding. In addition, it may be configured in the shape having a lid as shown for the filling of the catalyst.

In addition, the catalyst 30 applied to the present invention is a high-strength pellet-type nitrogen oxide reduction catalyst capable of exhibiting 90% or more of nitrogen oxide purification efficiency in a temperature range that a high temperature filter bag can withstand, and it is preferably at 120 to 200 ° C. It is a low temperature SCR catalyst having activity. The use of high-strength pellet-type catalysts is easier and cheaper to manufacture than conventional honeycomb-type catalysts in terms of its shape, and it is easy to exchange catalysts, thereby reducing manufacturing costs and minimizing air resistance. This can increase the purification efficiency.

A specific example of this is CRI SCR Catalyst, which has a pellet-type shape for reducing pressure loss and easy filling of the dust collector, and preferably has a maximum length of 8 mm and a minimum length of 1 mm. Pellets are preferred in view of reduced pressure loss and ease of filling. More preferably, three foot pellets having three feet on a spherical body as shown in FIG. 5 are good in terms of purification efficiency, pressure loss reduction, and ease of filling.

The combination of the pleated filter bag and the catalyst filling part filled with the catalyst as described above may be configured as a separate type or an integral type, and as an example, when having the configuration as shown in FIGS. 1 and 2, bent the lower cap structure. Insert the type cartridge, and put a plurality of catalyst filling parts therein, cover the upper portion with the upper cap, and the bonding portion of the cap is bonded by high temperature epoxy resin or the like and heat treated, it may be configured integrally. As shown in FIG. 3, the catalyst filling unit may be combined by welding, and the lower cap (not shown) may be assembled into the filter bag after being inserted into the filter bag.

The present invention is not limited to the above-described specific embodiments and descriptions, and various modifications can be made to those skilled in the art without departing from the gist of the present invention claimed in the claims. And such modifications are within the scope of protection of the present invention.

1 is an exploded perspective view showing an embodiment of the combined gas filtration device of the present invention.

Figure 2 is an exploded perspective view showing another embodiment of the combined gas filtration device of the present invention.

3 is an exploded perspective view showing another embodiment of the combined gas filtration device of the present invention.

Figure 4 is an embodiment of the catalyst filling unit applied to the combined gas filtration device of the present invention.

5 is one embodiment of a catalyst applied to the combined gas filtration device of the present invention.

Explanation of symbols on the main parts of the drawings

10: Pleated filter bag 12: Cylindrical part

14: lower cap structure 16: seam

18: upper cap 20: catalyst filling

22: filling space 30: catalyst

Claims (29)

A pleated filter bag 10, a catalyst filling unit 20 coupled to the inside of the pleating filter bag 10, and a catalyst 30 filling the catalyst filling unit 20, the catalyst 30 is a catalyst. Combined gas filtration device, characterized in that the high-intensity pellet-type nitrogen oxide reduction catalyst filled in the filling space of the filling section 20. 2. The combined gas filtering device according to claim 1, wherein the pleated filter bag (10) has an open top and a closed cylindrical shape. 3. The combined type gas according to claim 2, wherein the cylindrical shape is a form in which a circumferential portion 12 made of a woven or nonwoven filter media and a lower portion 14 made of a cap structure are combined. Filtration device. 4. The combined gas filtering device according to claim 3, wherein the woven or nonwoven filter media is a high temperature woven or nonwoven media that can be used at 120 ° C to 200 ° C. The method according to claim 3, wherein the filter media (filter media) is 1 ~ 200 ~ 400 g / m 2 200 ~ 400 300 ~ 1000 denier a web having a weight of consisting of 5 denier, a high temperature short fibers for the g / m ² Combined gas filtration device, characterized in that the binding cloth filter material is coupled to the needle punching (needle punching) on one or both sides of the E-glass fabric having a weight of. The method of claim 5, wherein the web a) 1 to 5 denier PTFE (PolyTetra Floro Ethylene) short fibers b) high temperature short fibers selected from 1 to 5 denier polyamide, polyimide, polysulfonamide and glass fibers; Combined gas filtration device characterized in that the intermixing of 70:30 to 50:50. The bent cartridge according to any one of claims 3 to 6, wherein the circumferential portion 12 is impregnated with a heat-resistant resin impregnated and dried in a nonwoven filter media manufactured by a spunlace method using a high temperature fiber. Combined gas filtration device, characterized in that the filter. 8. The combined gas filtering device according to claim 7, wherein the high temperature fiber is any one selected from polyamide, polyimide, polysulfonamide, polytetra fluoro ethylene (PTFE) and poly phenylene sulfide (PPS). . 8. The combined gas filtration device as claimed in claim 7, further comprising a chamfered surface or a polytetra fluoro ethylene (PTFE) membrane on the surface of the filter to increase the filterability of the filter. The combination cartridge according to any one of claims 3 to 6, wherein the circumferential portion 12 is a bent cartridge filter in which a heat resistant resin is impregnated and dried in a nonwoven filter media made of glass fiber. Type gas filtration device. 11. The combined gas filtration device of claim 10, further comprising a woolen surface or a PolyTetra Floro Ethylene (PTFE) membrane on the surface of the filter to increase the filterability of the filter. 7. The combined gas filtering device according to any one of claims 3 to 6, wherein the circumferential portion 12 is a cylindrical filter made of a woven or nonwoven filter media made of high temperature fibers. . The method of claim 12, wherein the high temperature fiber is any one selected from polyamide, polyimide, polysulfonamide, PTFE (PolyTetra Floro Ethylene), PPS (Poly Phenylene sulfide) and glass fiber Gas filtration device. 13. The combined gas filtration device as claimed in claim 12, further comprising a woolen surface or a PolyTetra Floro Ethylene (PTFE) membrane on the surface of the filter to increase the filterability of the filter. 3. The combined gas filtering device according to claim 2, wherein the cylindrical shape is made of a woven or nonwoven filter media, and the circumferential portion 12 and the lower portion 14 are integrally sewn. 16. The combined gas filtering device according to claim 15, wherein the woven or nonwoven filter media is a woven or nonwoven media consisting of high temperature fibers that can be used at 120 ° C to 200 ° C. 17. The bonded type according to claim 16, wherein the high temperature fiber is any one selected from polyamide, polyimide, polysulfonamide, PolyTetra Floro Ethylene (PTFE), Poly Phenylene sulfide (PPS), and glass fibers. Gas filtration device. 16. The combined gas filtration device according to claim 15, further comprising a surface roughened surface or a polytetra fluoro ethylene (PTFE) membrane on the surface of the filter to increase the filterability of the filter. The method of claim 1, wherein the catalyst filling unit 20 is a hollow cylindrical porous frame coupled to the interior of the pleated filter bag 10, characterized in that it is provided with a separate filling space 22 therein. Combined gas filtration device. 20. The combined gas filtration device according to claim 19, wherein the catalyst filling part (20) has a partition for separating the catalysts in the longitudinal direction or a stacked porous frame. 20. The combined gas filtering device according to claim 19, wherein the catalyst filling part (20) is made of stainless steel or galvanized steel. 20. The combined gas filtering device according to claim 19, wherein the catalyst packing part (20) is a steel plate or a network structure having a porosity of 50 to 80%. 20. The combined gas filtering device according to claim 19, wherein the catalyst packing part has a radial thickness of 5 to 25 mm. delete 2. The combined gas filtration device according to claim 1, wherein the nitrogen oxide reduction catalyst (30) is a low-temperature SCR (Selective Catalytic Reduction) catalyst having activity at 120 to 200 ° C. 2. The combined type gas filtering device according to claim 1, wherein the nitrogen oxide reduction catalyst (30) is 1 to 8 mm in length. 2. The combined gas filtering device according to claim 1, wherein the nitrogen oxide reduction catalyst (30) is in the form of a three-foot pellet having three feet on a spherical body. The method of claim 1, wherein the combination of the pleated filter bag 10 and the catalyst filling unit 20 includes at least one catalyst filling unit inside the pleating filter bag, and then covers the upper portion with the upper cap and joins the junction of the cap. Combined gas filtration device, characterized in that it is made in one piece. The method of claim 1, wherein the coupling of the pleated filter bag 10 and the catalyst filling unit 20 joins one or more catalyst filling units to each other, and then combines a lower cap to the lower portion of the filling unit to form the inside of the pleating filter bag. Combined type gas filtration device comprising a separate type to be inserted and assembled.

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