CDQ (cokes dry quenching system) is a waste heat recovery system that recovers waste heat from hot cokes with circulating gas and that generates high-pressure steam. In heat recovery systems, it is very important to operate the system with maximum efficiency. In CDQ, the flow rate of circulating gas must be manipulated to obtain maximum flow rate of steam. For this purpose, the dynamic model of this system is necessary. In this system, a temperature distribution within the each coke exists, because the diameter of the coke is relatively large and value of thermal conductivity is small. In this report, we investigated the dynamic characteristics of the system, taking account of the heat conduction effect within the each coke. The validity of this model is confirmed by comparing the calculated result with operation data. Next, we show that dynamic characteristics depend on three nondimensional parameters, namely, Biot number, NTU and Cr number. In the next roport, we will establish the optimum operation method using this model.
