CDQ System Designing and Dual-Loop PID Tuning Method for Air Steam Temperature

In this paper, we mainly introduce the key technology of a steel plant´s CDQ(Coke Dry Quenching) control system design based on PLC (Programmable LogicController). The CDQ control system is divided into five systems which are as follows: the coke loading, CDQ Chamber, the CDQ boiler, coke fines collection and cold coke expelling. It is controlled by two important parts, the host computer and the hypogenous computer. Because the main steam temperature lags seriously for replenishing cold water in the temperature adjustment process, a new dual-loop PID (Proportion Integration Differentiation) adjustment method is suggested to achieve the effective control of the main steam temperature in this paper. Since the system was put into operation for more than one year, the practical application shows that the CDQ control system run reliably and meets the production demand. Because the excellent performs and the energy saving figures of the CDQ system in environment protecting, it has achieved remarkable economic benefits and social benefits.