Analysis and optimization of coking process with minimum heat loss
Taking the heat loss minimization as the optimization objective,an optimization model of cokdng process was established based on the material balance and energy balance.Taking 9 parameters as optimal design variables (including coal charging ratio,heating gas ratio,water content of charging coal and coke pushing temperature,et al.) and considering 13 constraint conditions,a coking process was optimized with practical production data.The minimum heat loss and the optimal design variables were obtained.The influences of optimal design variables on minimum heat loss were studied.The results showed that increasing the dosages of 1/3 coking coal and lean coal and synchronously decreasing the dosages of gas coal,fat coal and coking coal could reduce the heat loss of the coking process.When the mixture ratio of blast furnace gas to coke oven gas was 7∶1,the minimum heat loss was obtained.Improving the desulfurization technology could relax the upper bound of sulfur constraint,which indirectly decreased the heat loss.After optimization,the volatile content of mixed coal could decrease by 3.3 ％ and the minimum heat loss decrease by 13.74 ％.In practical production,the dosages of raw materials should be kept in the range where the minimum heat loss changes relatively little to ensure continuous and stable production of coking process while reducing heat loss.
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