Total Heat Exchange Factor Based on Non-Gray Radiation Properties of Gas in Reheating Furnace

Modified mathematical models based on imaginary plane zone method in reheating furnace were developed in which non-gray radiation properties of gas were considered, and the Newton s method and the finite difference method were adopted. Effects of productivity, fuel consumption, fuel-air ratio, calorific value of fuel and inserting depth of thermocouple on total heat exchange factor along the length of reheating furnace were investigated. The results show that total heat exchange factor increases with productivity or inserting depth of thermocouple, and it decreases when fuel consumption, fuel-air ratio or calorific value of fuel increases. The results are valuable for dynamical compensation of total heat exchange factor for online control mathematical models in reheating furnace.