重庆钢厂的23米步进式加热炉热工自动控制,从1970年开始用DDZ-Ⅰ型电动单元组合仪表构成阀位配比方案控制炉温,起到了一定作用。但不能较准确地做到天然气流量(G_天)与空气流量(G_空)成比例进入炉内燃烧,而且G_天与G_空的比例也不能任意变化,因此炉气性质、炉温偏差等技术指标都很难达到生产工艺的要求。在厂革委会的领 Chongqing steel mills, 23-meter stepping furnace thermal automatic control, from 1970 began to use DDZ-I-type electric unit combination meter valve position ratio program to control the furnace temperature, played a certain role. However, the gas flow rate (G_day) can not be accurately compared with the air flow rate (G_air) into the furnace combustion, and the ratio of G_day to G_pace can not be arbitrarily changed. Therefore, the nature of furnace gas, furnace Temperature deviation and other technical indicators are difficult to meet the requirements of the production process. In the Revolutionary Committee collar