残氧量模型的修正方法在比例控制型烧嘴上的应用

Application of correction method for residual oxygen model on proportional controlled burner

针对首钢京唐公司某退火炉残氧量设定值与实测值偏差过大问题,提出一种针对燃烧控制系统残氧量模型的修正方法。通过测量烧嘴出口处烟气中的残氧量,得出燃烧控制系统空燃比实测值与设定值的偏差,从而计算出助燃空气流量修正值,并依此对残氧量模型进行修正。残氧量模型修正方法应用后,该退火炉残氧量设定值与实测值的平均偏差由3.37%降至0.15%,且各加热控制区残氧量偏差均小于1%,解决了因残氧量设定值与实测值偏差过大而导致残氧量模型无法应用于实际生产现场的难题。

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.