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
Department of Chemical Engineering,Chungnam National University,Republic of Korea
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 .
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 .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
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
*Corresponding author.Tel.:+821034523767.E-mail address:firstname.lastname@example.org (Y.-W.Rhee).
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
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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