KR20220049879A - Ptfe hybrid filter - Google Patents

Abstract

The present invention provides a PTFE hybrid filter composed of a support containing catalyst particles, wherein catalyst fibers are manufactured by incorporating catalyst particles in a filter support manufacturing step and are utilized as a support. The present invention provides contaminant removal performance.

Description

PTFE hybrid filter composed of a support containing catalyst particles {PTFE HYBRID FILTER }

The present invention relates to a hybrid filter capable of filtering both fine dust and harmful gas, and more particularly, to a PTFE hybrid filter containing catalyst particles capable of absorbing harmful gas.

In the combustion gas treatment process, not only dust but also harmful gases are generated. Various attempts are being made to simultaneously remove fine dust and harmful gases with a single filter.

However, in the prior art, various problems to be solved occur.

First, the combustion flue gas treatment process separately operates a dust collection facility and denitrification facility that removes dust from the bag filter and NOx in the downstream SCR process. There is a difficult problem.

In addition, a ceramic filter has been developed that supports a catalyst on a ceramic carrier to collect fine particles on the surface and simultaneously treats harmful gases inside the filter on which the catalyst is supported. Due to its low durability due to mechanical shock and its high price, there is no commercialization record and application is avoided due to uncertainty about the technology.

In addition, a technology to increase the denitration efficiency by removing dust from the primary dust collector and spraying powder-type catalyst particles for NOx removal in front of the secondary dust collector was applied, but it is difficult to uniformly disperse the denitration catalyst powder and to maintain the efficiency of the denitration catalyst. For this purpose, it is essential to primarily remove particulate matter, so two dust collectors are required, making it difficult to apply to existing small and medium-sized incineration facilities.

In addition, when a filter is manufactured by simply impregnating a PTFE nonwoven fabric with a catalyst or supporting a catalyst on a PTFE foam-coated filter medium, the catalyst coating amount is limited and the desorption phenomenon occurs at a certain thickness or more due to the bonding between PTFE and catalyst particles, so the durability of the filter a problem occurs in

There is a need for research on a hybrid filter having a new structure that can solve these problems.

Korean Patent Application No. 10-2004-0090182 Republic of Korea Patent Registration No. 10-0294857 Republic of Korea Registered Utility Model No. 20-0488097 Republic of Korea Patent Registration No. 10-1059510 Republic of Korea Patent Registration No. 10-0897370

According to an embodiment of the present invention, catalyst particles are mixed in the filter support manufacturing step to prepare a catalyst fiber, and the catalyst fiber is used as a support to manufacture a catalyst filter.

According to at least one embodiment of the present invention described above, the PTFE hybrid filter composed of a support including catalyst particles can expect the following effects.

First, the catalytic filter containing the particulate catalyst can have the ability to remove gaseous pollutants as well as particulate pollutants in the existing exhaust gas due to catalytic activity.

Second, by using the existing facilities as they are, the efficiency of the process can be improved because additional NOx can be removed to satisfy the strengthened environmental regulations even with the same equipment cost, required site and operating cost.

Third, in the present invention, by using a PTFE membrane filter, it has excellent chemical resistance such as heat resistance, acid resistance, and alkali resistance that can be used stably even at 260 ° C. With high air permeability and filtration efficiency of more than 99%, it can filter ultra-fine dust with PM 2.5 or less.

Fourth, the PTFE membrane catalyst filter is manufactured by dispersing and depositing the catalyst on the PTFE fiber to produce the catalyst-containing PTFE needle-punching nonwoven fabric and satisfying the requirements for air permeability and pressure loss to the filter media. There is no concern about an additional decrease in air permeability and an increase in pressure loss, and an additional denitrification effect can be obtained, so a low-cost and high-efficiency bag filter denitrification technology can be implemented without adding expensive denitrification facilities.

The effects of the present invention are not limited to the effects described above, and effects not mentioned above may be derived from the embodiments of the present invention described below.

1 to 9 are conceptual views of a PTFE hybrid filter composed of a support including catalyst particles and a filter manufacturing method according to an embodiment of the present invention.

In the present specification, the same and similar reference numerals are assigned to the same and similar components in different embodiments, and the description is replaced with the first description. As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, the suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The catalyst filter manufacturing method is as follows.

<Catalyst Fiber>

One. (Mixed) Catalyst particles, PTFE powder and lubricant are mixed (catalyst particle weight ratio: 1~10%)

2. (Compression) Processed into billet form by compressing PTFE powder containing catalyst particles

3. Extrusion processing of the processed billet into a rod shape

4. (Rolled) PTFE containing catalyst particles in the form of rods is processed into a film form

5. (Oil Removal) Remove lubricant from high temperature chamber

6. (Sintering/Stretching) Uniaxial stretching of PTFE film containing catalyst particles and phase change of PTFE in a high temperature chamber

7. (Slitting) Fiberization of sintered PTFE film containing catalyst particles

8. (Crimping) Creates irregularities in PTFE fiber containing catalyst particles

9. (Cutting) Cut the obtained fiber to a certain length

10. (Non-woven fabric processing) Catalyst nonwoven fabric produced by mixing PTFE fibers and PTFE fibers containing catalyst particles

<Manufacture of catalyst filter>

One. (Lamination) Filter media production by attaching a PTFE membrane to the catalyst PTFE non-woven fabric

2. (Sewing) Processed by sewing filter media in the form of a bag filter

(Type of metal catalyst) Nano metal catalyst is a noble metal catalyst such as platinum or palladium

Transition metals impregnated with titanium dioxide, silicon dioxide, aluminum oxide, etc. with copper, manganese, iron, vanadium, molybdenum, cobalt, nickel, zinc, etc.

In particular, titanium dioxide impregnated with vanadium

(size of metal catalyst)

The particle size of the metal catalyst may be 200 nm

Since the thickness of the catalyst fiber is 10 to 15 μm, the size of the metal catalyst particles cannot exceed this.

(Metal catalyst content)

The metal catalyst may be 3 to 15% by weight based on the weight of the filter.

Excessive metal catalyst content causes deterioration of the properties of the catalyst fiber, so it is controlled in a way that does not affect the filter life.

The present invention described above is not limited to the configuration and method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made.

Claims (1)

A PTFE hybrid filter composed of a support including catalyst particles that uses catalyst fibers as a support by mixing catalyst particles in the filter support manufacturing step.

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