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Method for apparatus for treating ammonia-containing gas

A gas and pretreatment technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as water quality deterioration, odor and environmental pollution, and achieve the effect of increasing NOX by-products

Active Publication Date: 2007-01-10
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Contains a lot of NH 3 Exhaust gas and waste water are discharged from various factories such as semiconductor factories, causing various harmful effects such as odor, environmental pollution and deterioration of water quality

Method used

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  • Method for apparatus for treating ammonia-containing gas
  • Method for apparatus for treating ammonia-containing gas
  • Method for apparatus for treating ammonia-containing gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] To 50 grams of hydrogen-substituted type (hydrogen-substituted type) Mordenite powder (HSZ-650 produced by Tosoh Company, SiO 2 / Al 2 o 3 =23), add the specified amount of chloroplatinic acid (HPtCl 6 .6H 2 O) in an aqueous solution so that the weight ratio of Pt was 0.5%, the mixture was dehydrated and dried, and the resulting product was calcined at 550° C. for 2 hours, so as to obtain a Pt-Mordenite catalyst. The obtained catalyst was slurried with silica gel and water, and a commercially available corrugated honeycomb support made of silica-alumina fibers (manufactured by NICHIAS Corporation, having a square of 150 and a length of 20 Honeycle 3722), and then, a Pt-Mordenite catalyst with a honeycomb structure was obtained after air drying for 2 hours, drying at 120° C. for 2 hours, and calcination at 500° C. for 2 hours. The Pt loading capacity of the catalyst is 0.75 g / L. The catalyst was cut to a width of 25 mm in order to obtain NH containing 3 25 x 150-L20...

example 2

[0076] The pretreatment catalyst layer is obtained in this way, which is the same as that described in Example 1 above, except that the preparation method of the pretreatment catalyst layer in Example 1 is changed, as described below.

example 1

[0077] The corrugated honeycomb material (150 square-L20) made of the silica-alumina fiber used in Example 1 uses 30% TiO 2 Sol (manufactured by Ishihara Sangyo Kabusiki Kaisha Co., Ltd.) was impregnated, after which the liquid was discharged by blowing air, and dried at 150°C. The obtained material was cut into pieces each having a width of 30, and then the three pieces were impregnated with dinitrodiamine platinum solution (Pt concentration: 1.33 g / L), dried again, and then these pieces were combined with the remaining two pieces. Calcined together at 600°C. The two types of obtained materials were laminated alternately with each other in order to obtain pretreatment catalyst layers.

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Abstract

A method for treating an ammonia(NH3)-containing gas to clarify the gas, which comprises contacting the NH3-containing gas to pass through a catalyst tower (9) firstly with a pre-treatment catalyst layer (1) having, in parallel, a flow path involving a catalyst layer having the function of oxidizing NH3 to form NO and a flow path involving a catalyst layer not having the above function, and then, contacting the resultant gas with a catalyst layer (2) having the denitration function and the function of oxidizing NH3 to form NO in combination; and an apparatus for practicing the method. The method allows the treatment of a gas containing NH3 in a high concentration with good efficiency, without the thermal deterioration of a catalyst layer or the increase of the generation of NOx as a by-product, and thus can be employed for converting NH3 in an exhaust gas or NH3 expelled from a waste water to a vapor phase to a harmless gas and for oxidizing and decomposing NH3 in a gas containing NH3 in a high concentration into nitrogen.

Description

technical field [0001] The invention relates to a method for treating ammonia (NH 3 ) gas method and device, especially a kind of NH in exhaust gas 3 or NH discharged from wastewater into gas phase 3 Methods and apparatus for rendering harmless; i.e., processing of NH-containing 3 Gas method and device, the device and method can be high concentration of NH 3 Highly oxidizes and decomposes to nitrogen efficiently. Background technique [0002] Contains a lot of NH 3 Exhaust gas and waste water are discharged from various factories such as semiconductor factories, causing various harmful effects such as odor environmental pollution and deterioration of water quality. In particular, in recent years, due to the NH contained in industrial wastewater 3 The process of seawater enrichment (eutrophication) such as red tides has become a social problem; in this regard, strict restrictions on NH in wastewater will be formulated. 3 Concentration Law. Therefore, for NH 3 Various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/58B01J23/46B01J29/22B01D53/86B01J23/652B01J29/068B01J35/00
CPCB01J29/068B01D53/86B01D53/8634B01D2257/406B01J23/6527B01J35/0006B01J35/19B01D53/58B01J23/46B01J23/652
Inventor 加藤泰良
Owner MITSUBISHI HITACHIPOWER SYST LTD
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