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重庆钢铁公司小型轧钢车间在连续式加热炉上采用了双层烘钢,使产量提高了60％,煤耗降低40.2％。这座加热炉要供给φ380与φ470两部轧机使用的尺寸不同的钢坯,因此要求在热工制度上须要将不同断面的钢坯,互不等待的达到共同出炉温度,据此,根据加热炉的结构特点和钢坯所需的加热时间,分别将大坯装在下层,小坯装在上层。下层大坯纵向断面互相靠紧。大坯与小坯之间用30mm元钢作垫铁隔开。上层小坯在纵向断面每隔两根留空隙30mm,其排列见图1。由于大坯加热时间较小坯长,要达到出炉温度要求就必须在小坯出炉后大坯仍然继续进行单层上表面加热,因此先将小坯由对面第2个炉门出炉,然后再将大坯于第1个炉门出炉。这座炉的炉头煤气压力在流到腰炉部分以后小于下加热的腰炉炉气压力,因此将下层大坯相互靠紧,这样上加热方面的炉气既不致由于下加热炉气上冲而增加阻力,可以顺利流动改善上加热的热交换,又可以保持住下加热的要求热量。为了使小坯尽快达到出炉温度,以便大坯有充分加热时间,因此两根小坯之间留出空隙以增加其受热
The small-scale rolling mill in Chongqing Iron and Steel Company adopted a double-layer bake operation on a continuous heating furnace, which increased the output by 60% and reduced the coal consumption by 40.2%. This furnace is supplied with billets of different sizes for both φ380 and φ470 rolling mills. Therefore, it is required that the billets with different sections need to reach the co-firing temperature without waiting for each other in the thermal system. Therefore, according to the structure of the furnace Characteristics and billet heating time required, respectively, in the lower billet, small billet installed in the upper. Lower billet longitudinal section close to each other. Between the big billet and the billet with 30mm yuan steel for the horn separated. The upper blank in the longitudinal section every two to leave gaps 30mm, the arrangement shown in Figure 1. As the billet heating time shorter billet length, in order to achieve the temperature requirements of the billet must be released in the small billet still continue to heat the upper surface of the monolayer, so the first billet from the second oven door opposite the furnace, and then Big blank in the first oven door baked. The furnace gas pressure in the furnace after flowing to the waist part of the furnace is less than the lower heating furnace gas pressure, so the lower blank close to each other so that the heating furnace gas neither due to the lower furnace gas on the red The increase of resistance, you can smooth flow to improve the heat on the heat exchange, but also to keep the next heat the required heat. In order to make the billet reach the tapping temperature as soon as possible so that the billet has a sufficient heating time, a gap is left between the two billet to increase its heating