Application of correction method for residual oxygen model on proportional controlled burner
WANG Dao-jin1, REN Wei-chao1, LÜ Lin-lin1, FU Zhen-xing2, QIAO Liang1
1. Cold Rolling Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China; 2. Department of Jingtang Operation Business Division, Beijing Shougang Automation Information Technology Co., Ltd., Beijing 100041, China
Abstract:A correction method of residual oxygen model for the combustion control system was proposed to address the problem of large deviation between set and measured values of residual oxygen in an annealing furnace of Shougang Jingtang Company. Through the measurement of residual oxygen in flue gas at the exit of burner, the deviation between measured and set values of air-fuel ratio for combustion control system was obtained. The correction value of combustion air flow was also calculated, and residual oxygen model was corrected accordingly. The average deviation between model set values and measured values of residual oxygen in annealing furnace was reduced from 3.37% to 0.15%, and the residual oxygen deviation in each heating control area was less than 1% by applying the residual oxygen correction method. It solved the problem that residual oxygen model could not be applied to the actual production site due to the large deviation between set value and measured value.
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