OP-II-3

OP-III-B-9DEVELOPMENT OF CATALYTIC REACTOR FOR COMBUSTIONOF NATURAL GAS FOR ENVIRONMENTALLY FRIENDLY GASTURBINE POWER PLANTSIsmagilov Z.R. 1 , Kerzhentsev M.A. 1 , Shikina N.V. 1 , Yashnik S.A. 1 ,Zagoruiko A.N. 1 , Khairulin S.R. 1 , Parmon V.N. 1 ,Zakharov V.M. 2 , Braynin B.I. 2 , Favorski O.N. 21 Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia, zri@catalysis.ru2 Central Institute of Aviation Motors, Moscow, RussiaIn the last decades, catalytic combustion has received an increasing interest asan ultra-low emission technology for gas turbines, providing possibility to decreasetoxic emissions of HC, CO, NO x [1-3]. In 2001, Catalytica Energy Systems Inc. (USA)jointly with Kawasaki Heavy Industries (Japan) launched commercial production ofsmall Kawasaki 1.4 MW turbines supplied with a catalytic combustion reactor,providing a decrease of NO x emissions below 3 ppm.At present, catalysts for gas turbines are manufactured mainly as monolithsprepared from metal foil with deposited porous washcoat and catalytically activecomponent (usually Pd). In this work, we present results on development and studyof catalytic combustion reactor alternative design for methane catalytic combustion inmini gas turbines of 400-500 kW power with regenerative cycle, intended fordecentralized power supply. The small power of these turbines results in reducedcatalyst loading reactor and makes possible the use of granular catalysts which aremore suitable for this application and can be easily manufactured.For successful accomplishment of design of this type of batch reactor we had toexplore several problems such as 1) high activity of catalysts at low temperatures and itshigh temperature stability, 2) selection of shape and size of granules, 3) reactor designwith low pressure drop, 4) optimization of combined catalyst loading in the reactor.In this paper, we present results on modeling and experimental study of three typesof structured loadings of the reactor: variation of catalytic activity and shape of granulesfor uniform loading and combined loading consisting of two or three different catalystbeds [4]. In a combined loading the first bed is formed of ring-shaped highly activePd-ceria catalysts initiating methane combustion at low temperature, the second bed,where the main part of methane is burned, is formed of ring-shaped thermally stableMn-La oxide catalyst, and the third (optional) bed is made of spherical granules of Pdcontaining catalyst used for afterburning of trace amounts of methane and CO.196