Process Computer Simulation Of A Coke Dry Quenching System

Coke dry quenching (CDQ) technology is an efficient and environmentallyfriendly process and is critically important in coking industry. This technology hasbeen applied widely in recent years in China. However, this technology needs furtherimprovement in order to increase its efficiency. Especially, the internal heat transfersystem in CDQ furnace and the relationship between operating parameters andinternal heat transfer system need to be further researched. Furthermore, the CDQoperating parameters needs to be well optimized to achieve lower operation cost andburning loss rate. In this study, simulation and theoretical analysis of CQD process iscarried out to investigate the heat transfer regularity and optimize the operationparameters in the first domestic CDQ device which is used for heat recoverycoke-oven. Improvement measures to be taken are proposed based on the simulationresults. Heat balance calculations for a110t/h treatment capacity dry quenchingfurnace were carried to obtain the required amount of circulating gas. Empiricalformulas were used to calculate the coke quenching time under the present designcondition. The key parameter, i.e. coke quenching time and factors affecting thequenching time were obtained and analyzed quantitatively. Reasonable proposals areput forward directing at large size cokes produced by heat recovery coke-oven.Simulation flow sheet of coke dry quenching process was established based on AspenPlus software. A heat-exchange module was used to simulate the heat transfer processinside the furnace. In order to verify the feasibility of simulation, the simulationresults were compared with the practical operation data. The governing factors onboiler inlet temperature were analyzed by sensitivity analysis in Aspen Plus.Combined with practical operation data, some effective measures are put forward tocontrol boiler inlet temperature. Finally, the burning loss rate and coke powder loss inCDQ system are discussed and design measures are put forward to reduce the burningloss rate and coke powder loss.