Distribution model of heating output based on on-off controlled annealing furnace
REN Wei-chao1,2, ZHU Guo-ming1, LI Yang-long3, LI Guan-xiong2, ZHOU Huan2, WANG Dao-jin2
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Cold Colling Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China; 3. Department of Metallurgical Process, Research Institute of Technology of Shougang Group Co., Ltd., Beijing 100041, China
Abstract：The on-off controlled combustion technology is widely used in various heating furnaces because of its good dynamic response, high temperature control accuracy, low gas consumption and pollutant discharge level. For vertical annealing furnace, there are three common heating models: the proportional model, the narrow model, the normal model. In line running status, operators can choose corresponding models according to the risks of strip deviation and buckling in the radiant tube heating section,but none of these three models are unable to avoid the problems of sudden cooling and heating of the radiator tube due to frequent opening and closing of burners. It could further induce the deformation and cracking of radiation tubes,abnormal consumption of ignition electrodes and control valves and large fluctuation of gas pressure. In order to reduce the frequency of burner opening and closing times,a "stair-climbing" type heating output distribution model was established. The relationship between the controller output of strip temperature and the heating output of each column at radiant tube heating section was fitted,and the correction function of heating output distribution model for the radiant tube heating section was obtained via the interpolation. It met the requirement that the calculated values of the model was consistent with the actual values. The upper and lower limits of each column of heating output were adjusted so that the heating output was distributed in a "stair climbing" manner. The function that the burners in the inlet area of the low power heating section do not work and the burners in the outlet area always work was realized in vertical annealing furnace. A completed combustion cycle was tested. It showed that the "stair climbing" model can greatly reduce the frequency of burner opening and closing times, under a complete combustion cycle. At the condition of 89.6% strip temperature controller output at the radiant tube heating section,the burner was switched on and off for 324 times,whereas it was only 32 times for the "stair-climbing" distribution model. When the strip temperature controller output of the radiant tube heating section is 89.6%, the switching frequency of the burner under the control of the traditional model is 324 times, while that of the "stair climbing" distribution model is only 32 times.
任伟超, 朱国明, 李洋龙, 李冠雄, 周欢, 王道金. 基于脉冲燃烧控制的退火炉热负荷分配模型[J]. 钢铁, 2022, 57(1): 151-158.
REN Wei-chao, ZHU Guo-ming, LI Yang-long, LI Guan-xiong, ZHOU Huan, WANG Dao-jin. Distribution model of heating output based on on-off controlled annealing furnace[J]. Iron and Steel, 2022, 57(1): 151-158.
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2022, Vol. 57 
