Heating Hood Air-Fuel Ratio Optimization of Bell Annealing Furnace
Coke oven gas used for heating hood combustion of bell annealing furnace is a mixed gas,which has an unstable calorific value.It is easily affected by various factors,which greatly interferes with the setting of the air-fuel ratio of the heating hood.If the air-fuel ratio is set too high,more exhaust gas being discharged,resulting in more heat loss and reduced thermal efficiency.If the air-fuel ratio is set too low,the heating capacity being insufficient,the annealing time being long,which reduces production.Both of them can cause pollution to the atmosphere.This article introduces a control strategy for the feedback method of exhaust gas oxygen content.After measurement and calculation,the optimal value and adjustment range of the air-fuel ratio were ultimately deter mined,achieving closed-loop control of the air-fuel ratio during the annealing process,solving the problem of unstable gas calorific value.The heating hood can burn completely,saving energy and reducing emissions,achieving the expected effect.
bell annealing furnaceheating hoodair-fuel rationoxygen content
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