Real-time calculation and variation law of coke burning loss rate in CDQ system
There is a common phenomenon of coke burning loss in the coke dry quenching(CDQ)process,which is the main source of sulfide and CO in CDQ system.By studying the variation law of coke burning loss rate in CDQ system,it can provide theoretical support for related pollutants control.Based on gaseous carbon balance in CDQ system,a real-time calculation method for coke burning loss rate was obtained.This method required obtaining vol-ume fractions of CO and CO2 in CDQ environment dust removal gas.Therefore,composition variation law of CDQ environment dust removal gas was studied,and there were CO2 and CO and a very small amount of NO in the gas.The concentrations of those components change periodically,they increase rapidly and reach a peak during the coke loading operation,and then decrease rapidly and tend to flatten out.The actual variation law of coke burning loss rate was obtained by the above testing data.The coke burning loss rate varies periodically during normal production,while it decreases without coke loading for a time.There is a peak in coke burning loss rate caused by coke loading,and its contribution to coke burning loss rate in CDQ system is about 10％.Comparing the three real-time calcula-tion methods of coke burning rate,it can be seen that the value obtained by imported air method is higher,while the value obtained by carbon(released gas)balance method is lower.Coke burning loss rate is too high when concentra-tion of CO in circulating gas is too low,and it can be reduced to the design level by increasing concentration of CO in circulating gas and taking other measures.
coke dry quenching(CDQ)coke burning lossburning loss rategaseous carbonvariation law
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