TWI469822B - Catalytic activated filter and a method for processing waste gas by using the catalytic activated filter - Google Patents

Description

Catalytic filter device and exhaust gas treatment method using catalyst filter device

The present invention relates to exhaust gas treatment equipment, and more particularly to catalyst filters.

A filtering device having a denitrification function, which can remove an incinerator, a cracking furnace (or a carbonization furnace), a boiler, a diesel engine, a glass used for municipal waste, sludge or factory waste by a single filtering device Dust, volatile organic compounds, sulfur oxides (SO _x ) and nitrogen oxides (NO _x ) in exhaust gas generated by furnaces, metal melting furnaces, high-temperature furnaces or reactors. Such filtration equipment has been reported to include filter elements comprising catalyst fibers of titanium oxide and vanadium oxide.

However, a single filter device has disadvantages such as insufficient processing air volume, poor removal efficiency, and high operating cost in replacing the aged catalyst.

In view of the above, the present inventors have made great efforts to improve and solve the above-mentioned shortcomings, and have finally made a proposal to rationally and effectively improve the above-mentioned defects.

It is an object of the present invention to provide a catalytic filter device which can treat dust, acid waste gas (such as hydrochloric acid, hydrofluoric acid, sulfur oxides, etc.), nitrogen oxides and Dai Ou. (European) Xin's exhaust gas. By connecting a plurality of catalyst filters in series, the catalyst filter device of the present invention can improve the processing air volume and the removal efficiency, and can reduce the operation cost by replacing the aging catalyst by dividing into a plurality of catalyst filters.

In order to achieve the above object of the present invention, the present invention provides a catalytic filter device comprising: a first catalytic filter comprising a plurality of first tubular filter elements disposed in a first housing; and a second catalytic filter a plurality of second tubular filter elements disposed in the second housing and in series with the first catalyst filter.

In one aspect of the invention, both the first tubular filter element and the second tubular filter element comprise a porous layer and at least one substrate having catalyst particles.

In one aspect of the invention, the material of the porous layer is ceramic, polytetrafluoroethylene (PTFE) or metal.

In one aspect of the invention, the substrate comprises at least one material selected from the group consisting of woven, non-woven, and ceramic fiber cloth.

In one aspect of the invention, the catalyst particles are attached to the surface of the substrate by a polymeric binder.

In one aspect of the invention, the polymeric binder comprises at least one material selected from the group consisting of polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), high molecular weight polyethylene (HMW-PE), and high molecular weight polypropylene (HMW). -PP), a group consisting of perfluoroacrylate (PFA), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride tripolymer (THV) and polychlorotrifluoroethylene (CFE).

In one aspect of the invention, the catalyst particles are embedded in a substrate.

In one aspect of the invention, the catalytic filter device further includes a selective catalytic converter.

Further, the present invention relates to an exhaust gas treatment method using a catalytic filter device for treating exhaust gas through the above-described catalytic filter device. In one aspect of the invention, the off-gas comprises dust and at least one volatile organic compound, sulfur oxides, nitrogen oxides, and dioxin.

10‧‧‧catalyst filter equipment

12‧‧‧First Catalytic Filter

120‧‧‧shell

122‧‧‧First tubular filter element

14‧‧‧Second catalytic filter

140‧‧‧shell

142‧‧‧Second tubular filter element

16‧‧‧ Pipes

18‧‧‧Injection

20‧‧‧Tubular filter element

22‧‧‧Porous layer

24‧‧‧First substrate

26‧‧‧Contaminants

36‧‧‧Second substrate

38‧‧‧ Third substrate

40‧‧‧Substrate

42‧‧‧catalyst particles

44‧‧‧ Polymer Adhesive

50‧‧‧Tubular filter element

54‧‧‧Substrate

56‧‧‧Contaminants

58‧‧‧catalyst particles

60‧‧‧Incinerator

62‧‧‧ Pipes

64‧‧‧Injection

65‧‧‧Injection

66‧‧‧First Catalytic Filter

68‧‧‧Second catalytic filter

70‧‧‧ heat exchanger

72‧‧‧Blowers

74‧‧‧Selective Catalyst Restorer

76‧‧‧ chimney

The first figure is a schematic diagram of a catalytic filter device according to an embodiment of the present invention.

The second drawing is a schematic cross-sectional view of a tubular filter element comprising a porous layer in accordance with one embodiment of the present invention.

The third figure is a schematic cross-sectional view of a tubular filter element of one embodiment of the present invention.

The fourth figure is a schematic view of the catalyst particles of one embodiment of the present invention being adhered to a substrate.

Figure 5 is a schematic illustration of a tubular filter element in accordance with one embodiment of the present invention.

Fig. 6 is a schematic view showing the treatment of exhaust gas generated in an incinerator by a catalytic filter device according to an embodiment of the present invention.

The seventh drawing is a schematic diagram of the treatment of the exhaust gas generated by the catalytic converter device of another embodiment of the present invention in an incinerator.

The detailed description and technical content of the present invention are set forth in the accompanying drawings.

Please refer to the first figure, which is a schematic diagram of a catalyst filter device according to an embodiment of the present invention. The catalyst filter device 10 of the embodiment includes a first catalyst filter 12 and a second catalyst filter 14. The first catalytic filter 12 includes a plurality of first tubular filter elements 122 disposed in the first housing 120, and the second catalytic filter 14 is disposed at A plurality of second tubular filter elements 142 in the second housing 140 are in series with the first catalytic filter 12. By connecting the first catalytic filter 12 and the second catalytic filter 14 in series, the processing air volume and the removal efficiency can be improved, and the operating cost can be reduced by replacing the aging catalyst by dividing into two catalytic filters.

The exhaust gas, for example, contains dust, volatile organic compounds, nitrogen oxides, acid exhaust gases (such as hydrochloric acid, hydrofluoric acid, sulfur oxides, etc.) and Dai O (Xin) can enter the catalytic filter device 10 through the conduit 16. Further, ammonia gas and an alkali absorbent (e.g., sodium hydrogencarbonate powder or calcium hydroxide powder, etc.) for reducing nitrogen oxides may be introduced through the injection port 18 at the upstream of the gas of the catalytic filter device 10.

Next, please refer to the second drawing, which is a schematic cross-sectional view of a tubular filter element comprising a porous layer in one embodiment of the invention. In this embodiment, the tubular filter element 20 comprises a porous layer 22 and a substrate 24 having catalyst particles, and the porous layer 22 is attached to the substrate 24. In this embodiment, the porous layer 22 is located on the upstream side of the substrate 24, whereby the contaminants 26 to be filtered (e.g., dust particles, nitrogen oxides) are first contacted to the porous layer 22. In order to protect the catalyst on the surface of the substrate 24 or embedded in the substrate 24 from shielding and poisoning, the porous layer 22 which first contacts the contaminant 26 can block a large portion of the dust particles, thereby preventing the dust particles from contacting the substrate. 24 Catalyst on the surface or embedded in the substrate 24. The material of the porous layer 22 is not particularly limited, and is preferably, for example, ceramic, PTFE or metal. Substrate 24 comprises at least one material selected from the group consisting of woven, non-woven, and ceramic fiber cloth.

Next, please refer to the third drawing, which is a schematic cross-sectional view of a tubular filter element according to an embodiment of the present invention. The third figure expands the filtering capacity of the tubular filter element in the second figure. In this embodiment, the tubular filter element 30 includes a porous layer 22, a first substrate 24, a second substrate 36, and a third substrate 38. In this embodiment, the porous layer 22 is located at the first base. On the upstream side of the material 24, the first substrate 24 is adjacent to the second substrate 36, and the second substrate 36 is adjacent to the third substrate 38. The first substrate 24 has a first type of catalyst, the second substrate 36 has a second type of catalyst, and the third substrate 38 has a third type of catalyst, and the first, second and third types of catalysts have different Features. In this embodiment, the catalyst can also have different types and functions on the same substrate. The porous layer 22, the first base material 24, the second base material 36, and the third base material 38 may be adhered and fixed by a polymer adhesive. The polymer adhesive comprises at least one material selected from the group consisting of polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), high molecular weight polyethylene (HMW-PE) and high molecular weight polypropylene (HMW-PP), perfluoroacrylate. (PFA), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride tripolymer (THV) and polychlorotrifluoroethylene (CFE).

Next, please refer to the fourth figure, which is a schematic view showing the adhesion of the catalyst particles of the embodiment of the present invention to a substrate. The catalyst particles 42 are adhered to the surface of the substrate 40 by the polymer adhesive 44. The polymer adhesive comprises at least one material selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene propylene, high molecular weight polyethylene and high molecular weight polypropylene, perfluoroacrylate, polyvinylidene fluoride, tetrafluoroethylene-hexafluoroethylene-fluorinated A group consisting of ethylene tripolymer and polychlorotrifluoroethylene.

Next, please refer to the fifth drawing, which is a schematic view of a tubular filter element according to an embodiment of the present invention. The difference from the fourth figure is that the catalyst particles 58 of this embodiment are embedded in the substrate 54. In this embodiment, the tubular filter element 50 includes a porous layer 22 and a substrate 54 in which the catalyst particles 58 are embedded, and the porous layer 22 is attached to the substrate 54. In this embodiment, the porous layer 22 is located on the upstream side of the substrate 24, whereby the contaminants 56 to be filtered (e.g., dust particles, nitrogen oxides) are first contacted to the porous layer 22. In order to protect the catalyst particles 58 embedded in the substrate 54 from masking and poisoning, the porous layer 22 that first contacts the contaminants 56 can block a significant portion of the dust particles, thereby avoiding The dust particles contact the catalyst particles 58 embedded in the substrate 54. The material of the porous layer 22 is not particularly limited, and is preferably, for example, ceramic, polytetrafluoroethylene (PTFE) or metal. The substrate 54 comprises at least one material selected from the group consisting of woven fabrics, non-woven fabrics, and ceramic fiber cloths.

Next, please refer to the sixth drawing, which is a schematic diagram of the treatment of the exhaust gas generated by the catalytic converter device in an incinerator according to an embodiment of the present invention. The flue gas produced by the incinerator 600, for example, contains dust, hydrochloric acid, hydrofluoric acid, sulfur oxides, nitrogen oxides, and Dioxin through the conduit 602 into the catalytic filter unit. In addition, the ammonia gas for reducing nitrogen oxides may be from the injection port 604 at the upstream of the gas of the catalytic filter device, and the alkaline absorbent (such as sodium bicarbonate powder or calcium hydroxide powder) for removing sulfur oxides may be The injection port 606 upstream of the gas of the catalytic filter device enters. The catalytic filter device in this embodiment includes a first catalytic filter 610 and a second catalytic filter 620 in series.

Due to the material and structure of the filter element in the first catalyst filter 610 and the second catalyst filter 620 of the present invention, the temperature of 180 to 450 ° C can be removed together to contain dust, hydrochloric acid, hydrofluoric acid, sulfur. Oxides, nitrogen oxides and Dioxo (European) exhaust gas, the removal rate of nitrogen oxides is 95%, the amount of export dust is less than 3mg/Nm ³ , and the removal rate of hydrochloric acid and hydrofluoric acid is 90~95%. The removal rate of sulfur oxides is 80 to 90% and the removal rate of Dai O (Europe) is 99%. The selective catalytic converter 630 may be disposed after being connected to the second catalytic filter 620 as needed to increase the efficiency of removing nitrogen oxides. Compared with the exhaust gas treatment technology including the electrostatic precipitator (ESP), the activated carbon injection, the sulfur dioxide water washing tower and the selective catalytic converter which is required to reheat the gas, the catalytic filter device of the present invention has a simplified flow. And the advantage of reducing investment and operating costs.

Moreover, this embodiment is advantageous in thermal management, the selective catalyst reducer 630 The proper operating temperature is about 300 ° C, so the temperature of the outlet flue gas exiting the selective catalytic converter 630 can be lowered to 100 to 120 ° C, so the heat exchanger 640 can be retrofitted to recover thermal energy. The incinerator 600 sometimes adds petroleum coke having a high sulfur content as a fuel. In order to reduce sulfur dioxide in the flue gas, a sulfur dioxide water washing tower 660 may be added, and limestone or seawater and sulfur dioxide may be used to remove sulfur dioxide. In addition, since the proper operating temperature of the sulfur dioxide scrubbing tower 660 for flue gas desulfurization is less than 40 ° C, the present embodiment provides a water spray device 650 in the conduit 626 to cool the flue gas before entering the sulfur dioxide scrubber 660 to less than 40 ° C. Follow-up operations. Finally, the purified air flowing out of the sulfur dioxide water wash column 660 can be discharged to the atmosphere via a conduit 628 by a blower 670 to the stack 680.

The seventh drawing is a schematic diagram of the treatment of the exhaust gas generated by the catalytic converter device of another embodiment of the present invention in an incinerator. The difference from the embodiment shown in FIG. 6 is that another set of ammonia gas injection port 704 and an alkaline absorbent injection port 706 are added between the first catalyst filter 610 and the second catalyst filter 620 for injection. Ammonia and alkaline absorbents improve the removal efficiency of nitrogen oxides and sulfur oxides.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and other equivalent variations of the patent spirit of the present invention are all within the scope of the invention.

10‧‧‧catalyst filter equipment

12‧‧‧First Catalytic Filter

120‧‧‧shell

122‧‧‧First tubular filter element

14‧‧‧Second catalytic filter

140‧‧‧shell

142‧‧‧Second tubular filter element

16‧‧‧ Pipes

18‧‧‧Injection

Claims (9)

A catalytic filter device comprising: a first catalytic filter comprising a plurality of first tubular filter elements disposed in a first housing; and a second catalytic filter comprising a second housing a plurality of second tubular filter elements in series with the first catalyst filter, wherein each of the first tubular filter elements and each of the second tubular filter elements comprises a porous layer and at least one A substrate of the catalyst particles, and the porous layer is attached to the outer surface of the substrate located at the outermost portion. The catalyst filter device of claim 1, wherein the material of the porous layer is ceramic, polytetrafluoroethylene or metal. The catalyst filtration device of claim 1, wherein the substrate comprises at least one material selected from the group consisting of woven fabrics, non-woven fabrics, and ceramic fiber cloths. The catalyst filter device of claim 1, wherein the catalyst particles are attached to the surface of the substrate by a polymer adhesive. The catalyst filter device according to claim 4, wherein the polymer adhesive comprises at least one material selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene propylene, high molecular weight polyethylene and high molecular weight polypropylene, perfluoro acrylate, and poly a group consisting of vinylidene fluoride, tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride tripolymer and polychlorotrifluoroethylene. The catalytic filter device of claim 1, wherein the catalyst particles are embedded in a substrate. The catalyst filter device of claim 1, further comprising a selective catalyst restorer. Connected to the second catalyst filter. An exhaust gas treatment method using a catalytic filter device for treating exhaust gas by passing the exhaust gas through the catalytic filter device of claim 1. The method of treating exhaust gas using a catalytic filter device according to claim 8, wherein the exhaust gas comprises dust and at least one volatile organic compound, sulfur oxide, nitrogen oxide, and dioxin.