Study Of Furnace Process Modeling And Control

Reheating furnace is one of the most important heating equipment used to reheat the slabs before rolling in steel rolling process, which also consumes a great amount of energy. It is a crucial goal to improve heating efficiency of reheating furnace and reduce the energy consumption as much as possible. And this goal is also meaningful for steel industry to reduce manufacturing cost and environmental pollution. So the research of reheating furnace modeling and optimal control is becoming more and more important.The reheating furnace is typically a complex industrial process, which almost owns all characteristics of complex systems, such as difficulty to establish an exact mathematic model, severe interference, non-linear, large time-delay and so on, Which results that the conventional PID control technique is difficult to achieve good control effect.In this paper, we combine the heating mechanism and the actual characteristics of the regenerative walking beam furnace to research modeling and control of furnace.Firstly,we base on radiation and convection law in the furnace and slab heat conduction law to build slab temperature model, and thus obtain wall temperature model. Secondly,we use the established model of the slab and furnace wall temperature, is use of the idea of the ternary model, build a simplified model of the furnace thermal process, solving the gas temperature, and compare and analysis of temperature curve of mechanism model and of fitted model. Finally, against for mechanism model, we designed based on fuzzy control of controller, and compare and analysis of the control effect of the traditional PID controller and fuzzy controller. At the same time, the characteristics of the strong coupling between each furnace segment, each loop with a simple controller is difficult to achieve the desired results. In this paper, we design fuzzy decoupling controller to decouple the various segment, and compare effects of controller with no decoupling and fuzzy decoupling controller, and analysis the result, achieve the desired results.