Design Of The Fuzzy Control System Of Regenerative Walking Beam Heating Furnace And Smoke Temperature

Owing to high energy consumption and high pollution,process control level has direct impact on consumption,pollutant emission and quality of slab heating.Application of regenerative combustion technology helps energy saving and environmental protection,yet the commutation mechanism increases the complicity of furnace control.Although exhausting temperature is non-core parameter,yet it is an important indicator which reflects the situation of waste heat cycling.Thus,it is positive to control exhausting temperature well for enhancing heating efficiency of regenerative furnace and cut down consumption of energy.In this paper,combining with real project,regenerative furnace control system is designed and methods of controlling exhausting temperature are developed.Firstly,producing process and equipment composition of a regenerative walking-beam reheating furnace are described.Based on the principles of high cohesion,low coupling and hierarchical control,the reheating furnace automatic control system is designedBased on systematically concluding fuzzy logic theory and methods and steps of basic fuzzy controller,exhausting temperature fuzzy controller is designed.Via the comparison the control result with that of PID algorithm,it indicates that fuzzy control has strong robust and good control effect can be obtained without necessarily accurate mathematic model.It is analyzed that exhausting temperature is not only affected by emission volume,but disturbed by combustion air blow volume and hearth temperature.So,the latter two factors are treated as feed forward variables in the GPC algorithm and are counteracted so as to control exhaust temperature accurately.