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Removal characteristics of nitrogen oxide of high temperature catalytic filters

Removal characteristics of nitrogen oxide of high temperature catalytic filters

Removal characteristics of nitrogen oxide of high temperature catalytic filters

Removal characteristics of nitrogen oxide of high temperature catalytic filters for simultaneous removal of fine particulate and NO x

Young-Ok Park a ,Keon-Wang Lee b ,Young-Woo Rhee b ,*

a Clean Coal Research Center,Korea Institute of Energy Research,Republic of Korea

b

Department of Chemical Engineering,Chungnam National University,Republic of Korea

1.Introduction

As energy consumption increases according to improvement of living standard due to industrial development,a lot of air pollutants are emitted to the atmosphere.Environmental pro-blems such as global warming,acid rain,and destruction of ozone layer due to air pollutants like nitrogen oxides (NO x ),sulfur oxides (SO x ),carbon monoxide (CO),particulate matter,and others are coming into spotlight.Intensive treatment is needed especially for particulate matter,NO x ,SO x ,etc.included in gas exhausted from fossil fuel combustion systems before it is emitted into the air.To treat these kinds of air pollutants,it needs to install appropriate air pollution control device according to the types of air pollutants.However,a great effect of simple process and energy saving method can be expected,if air pollution control techniques which make the separate treatment processes happen simultaneously were developed and utilized.Among these combined techniques,a research for removal fine particulates,dioxin,or NO x all at once has been carried out since 2000in Korea [1].

There are two problems to be solved to remove in one breath particulates and NO x included in emitted gas from combustion facilities of fossil fuel.First problem is development of a bag filter which would not be transformed by exhausted gas in the high temperature,and second one is loading catalysts to remove NO x in the low temperature to replace economically inefficient systems

where the NO x removal in the high temperature by reheating exhausted gas are one of those.Accordingly,in this study we developed three-multi layer filter media which can be collect the fine particulates in the high temperature of exhausted gases.

The selective catalytic reduction (SCR)method used to remove NO x in the exhausted gases.Generally,V 2O 5/TiO 2catalyst is widely used in SCR method because of its high efficiency [2,3].This method uses catalysts of metal oxide while introducing reducing agents like ammonia to react and dissolve in the high temperature of about 300–3508C.This method is relatively effective but it has a disadvantage that need to maintain high reaction temperature showed be higher than 3008C.We solved this problem by choosing CuMnO x catalyst to remove nitrogen oxide without reheating of exhaust gas while processing it at low temperature within 150–2508C [4].To find the optimum loading amount of catalyst for the developing the catalyst loaded three-layer pleated filter media,we compared and analyzed the characteristics of NO removal according to the loading amount of CuMnO x catalysts and operation temperature,and also we studied the effect of oxygen concentration in the atmosphere on NO removal rate,and the influence of SO 2in the exhausted gas on NO removal.2.Experimental

2.1.Preparation of the catalytic filter

The surface layer of developed three-layer pleated filter media consists of three multi layers.The surface layer was made of microporous foam layer which can prevent the penetration of

Journal of Industrial and Engineering Chemistry xxx (2009)xxx–xxx

A R T I C L E I N F O Article history:

Received 17March 2008Accepted 29July 2008Keywords:NO x

Catalytic filter Dust

Filtration

A B S T R A C T

The CuMnO x catalysts were deep coated into polysulfonamide felts by vacuum suction to simultaneously remove the particulate and nitrogen oxides.This filter consists of a high temperature foam layer as a surface layer,a catalytic pleated felt as a medium layer and glassfiber fabric layer with high temperature phenol resin as a final layer.In this study,the effects of catalyst loading on the pleated felt,operating temperature on nitrogen oxides reduction with NH 3were mainly investigated.Tests were conducted at operating temperature range from 150to 2508C and at face velocity of 1m/min.Within these ranges,NO removal efficiency was over 90%at the catalyst loading of 350g/m 2and 2008C.ß2009The Korean Society of Industrial and Engineering Chemistry.Published by Elsevier B.V.All rights

reserved.

*Corresponding author.Tel.:+821034523767.E-mail address:ywrhee@cnu.ac.kr (Y.-W.Rhee).

G Model

JIEC-137;No of Pages 4

Please cite this article in press as:Y.-O.Park,et al.,J.Ind.Eng.Chem.(2009),doi:10.1016/j.jiec.2008.07.009

Contents lists available at ScienceDirect

Journal of Industrial and Engineering Chemistry

j o u r n a l h om e pa g e :w w w.e l s e v i e r.c o m /l o ca t e /j i e c

1226-086X/$–see front matter ß2009The Korean Society of Industrial and Engineering Chemistry.Published by Elsevier B.V.All rights reserved.doi:10.1016/j.jiec.2008.07.009

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