Design And Application Of Automatic Control System Of Coke Dry Quenching

Coke Dry Quenching(CDQ) is a method of cooling hot coke with inert gas. In the process of CDQ, the red coke put in at the top of the furnace. The low temperature inert gas is insufflated to the cooling layer of the furnace by the circle fan, and absorb heat from the red coke. After cooling, the coke expel from the bottom of the furnace. The high temperature inert gas from the annular flue of the furnace exchange the heat in the boiler, and it produces steam. Then, the cooled inert gas is insufflated to the furnace by the circle fan again. The inert gas is used in a closed system with recycling. The steam produced in boiler can merge into the steam duct of the factory, or generate electricity through the steam dynamo. In the part of dust, CDQ applies with the special dust catcher, for cycle gas and environment.In the thesis, the control system of CDQ uses the products of RockWell Company. We choose the redundancy system, and program with ControlLogix5000. The industrial computers communicate with CPU through EtherNet, and all the I/O modules combine to the CPU through ControlNet. We use RSView SE to make HMI programs. In the entire system, there are a lot of instruments which provide the function of regulation, so the thesis introduces PID control.Combining with the technique, the thesis particularly introduces the important joint equipments and instrumentations. In the part of the furnace, it illuminates orderly, followed by the joint equipments of the coke input, the instrument in the furnace, the joint equipments of the coke expel, the regulation of output quantity of coke and the temperature control of the expelled coke. In the part of the boiler, it introduces the regulate of the water supply and the temperature of the steam. In the control of the water supply for boiler uses the regulate of three-pulse, which improves the running condition of the drum, makes small fluctuation of the drum level. Lastly, it introduces the technique about the dust catcher for cycle gas and environment.Comparing to the Coke Wet Quenching, CDQ is excelled. Firstly, it improves the quanlity of coke, shorten the time for coke produced. Secondly, it uses the heat from red coke adequately, generates electricity, and saves energy. At last, it has efficient dust catcher, reduces the expel of injurant, and protects the environment.