THERMOPHYSICAL PROPERTIES OF ASH （热物理性质的火山灰）.pdf

ProceedingsProceedingsProceedings ofofof InternationalInternationalInternational ConferenceConferenceConference ononon HeatHeatHeat ExchangerExchangerExchanger FoulingFoulingFouling andandand CleaningCleaningCleaning 201120112011 (Peer-reviewed)(Peer-reviewed)(Peer-reviewed) JuneJuneJune 050505 10,10,10, 2011,2011,2011, CreteCreteCrete Island,Island,Island, GreeceGreeceGreece Editors:Editors:Editors: M.R.M.R.M.R. Malayeri,Malayeri,Malayeri, A.P.A.P.H. Müller-SteinhagenWatkinsonWatkinson andand H.H.andMüller-SteinhagenMüller-SteinhagenA.P. Watkinson Published online THERMOPHYSICAL PROPERTIES OF ASH DEPOSIT ON BOILER HEAT EXCHANGE SURFACES A. Ots Tallinn University of Technology, Kopli 116, 11712 Tallinn, Estonia, aots@sti.ttu.ee ABSTRACT planar or cylindrical wall). A brief overview on boiler tubes ash deposit charac- The radiation heat exchange between boiler tubes and terization and thermophysical properties of deposits are surrounding medium depends on the thermal radiation given. properties of the ash deposit. The structure of an ash deposit on the heat exchange surface of a boiler is usually non-uniform. The thickness ASH DEPOSIT of the deposit increases with time and during this process The fouling of heat exchange surfaces of a boiler oc- chemical reactions and sintering