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一、国内环形加热炉的现状 1.小直径、低产量国内一般环形加热炉直径(中径)在(?)米内,炉膛环宽小于2米、供棒材、管材、轮、轴坯料加热用,每小时产量不超过10吨。如重庆特钢棒材轧机用的环形加热炉中径为10米,一批锻造用的环形加热炉中径为3.1米至8.8米,每小时产量为2～10吨。国内自行设计制造的最大的环形加热炉是马钢轮箍厂,中径为28米,产量每小时约50吨。 2.热效率低、单位热耗指标高由于燃烧装置落后、余热回收利用差、因而热效率低,单位热耗高达250×10~4千焦/吨。 3.工件温差大,影响产品质量由于炉膛温度控制段设计落后,生产控制系统落后,不能实现加热状态的最佳化,因而出料口钢坯温度差达±20℃,对轧制、锻造的产品质量有一定的影响。
First, the status of the domestic ring furnace 1. Small diameter, low output Domestic general ring furnace diameter (diameter) within (?) Meters, the furnace ring width of less than 2 meters for the bar, pipe, wheel, shaft blank heating , The output per hour does not exceed 10 tons. Such as Chongqing Special Steel rod mill ring furnace with a diameter of 10 meters, a number of ring forging furnace with a diameter of 3.1 to 8.8 meters, the output per hour of 2 to 10 tons. The largest toroidal furnace designed and manufactured domestically by China is Magang Steel Wheel Hose Factory, with a diameter of 28 meters and an output of about 50 tons per hour. 2. Low thermal efficiency, high unit heat index As the combustion unit lags behind, poor heat recovery and utilization, so the thermal efficiency is low, the unit heat consumption up to 250 × 10 ~ 4 kJ / ton. 3. Large workpiece temperature difference, affecting product quality As the furnace temperature control section of the backward design, production control system is backward, can not achieve the optimization of the heating state, so the billet temperature difference of ± 20 ℃, the rolling, forging products Quality has a certain impact.