Design Of On-line Intelligent Detection And Optimization Control System For Combustion Efficiency Of Heating Furnace

With the continuous promotion of sustainable development strategy,energy conservation,emission reduction and green manufacturing in metallurgy,petrochemical and other industries have been put in the first place.The heating furnace in metallurgical industry is not only one of the key equipment in the production process,but also the key energy consumption equipment.Under the premise of ensuring the heating quality of billet,it has become an important research topic to precisely control the furnace temperature,improve the combustion efficiency and reduce the exhaust gas emission.At present,there are still many problems in the development of furnace temperature control:the billet temperature in the furnace is difficult to be accurately measured,the billet quality cannot be guaranteed,and it is easy to cause the phenomenon of"overburning";the combustion efficiency of the furnace is low,and the corresponding flow cannot be accurately adjusted according to the change of heating value.In this paper,an on-line intelligent detection and optimization control system for the efficiency of metallurgical heating furnace is developed.The system uses the full field infrared temperature measurement device and laser spectrum absorption detection device to obtain the information of billet surface temperature and furnace gas content respectively,to realize the online intelligent detection of heating furnace efficiency.Based on this information,combined with the information obtained by other original detection equipment?furnace thermocouple,gas calorific value tester,etc.?,it is input to the secondary control model together^[1]In order to improve the thermal efficiency of the heating furnace,the closed-loop feedback is realized by adjusting the air flow and gas flow.The main contents of this paper are as follows:?1?Based on the research background of temperature control in reheating furnace,a set of high-precision infrared full field temperature measurement device is developed to obtain the surface temperature of billet in real time,which provides direct and effective verification means for the temperature distribution in furnace and billet heating model;?2?A miniaturized high-precision angle reflection laser gas detection device with cooling and temperature control is used to monitor the combustion gas?CO,O2?content in the furnace in real time,which provides an effective monitoring means for the complete combustion and low oxygen combustion control of the heating furnace,and is also conducive to the realization of energy conservation and emission reduction and reduction of billet oxidation and burning loss;?3?The parameters such as billet surface temperature and furnace atmosphere content are introduced into the secondary system of reheating furnace to verify the existing model and provide the basis for model optimization,which lays the foundation for the final realization of optimal control;?4?The scheme design and theoretical analysis of intelligent optimal control of heating furnace are carried out;?5?A set of application software is designed for the system,which can display billet temperature,oxygen and carbon monoxide content in the furnace in real time,realize online intelligent monitoring and remote data access;?6?Application results and analysis.