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钢坯喷流预热装置是轧钢加热炉节能的一项新技术。本文介绍在一台实验装置上进行热模拟试验的概况,通过喷流实验装置的一系列试验工作,得出喷口与受热件表面间的最佳适用距离是:90～200毫米,l/d应在7.7—10.2范围内选取为好。喷出烟气温度t对热效率η有明显影响,为使喷流室内铜坯受热量增大,应尽量减少烟气出炉后的温降。过高的喷流速度W不利于热利用率的提高,一般最大的喷流速度以80—100米/秒为好。从喷流预热生产性装置的使用实践可知:炉子油耗有较大幅度的下降,节油10%以上。虽然装置投产后增加了风机用电,但由于钢温的改善,轧钢工序的电耗实际上是下降的。通过铜坯测温试验可知,经喷流装置后,钢坯平均预热温度可达170～200℃。喷流预热装置对环保及车间劳动保护无明显不良影响。投产半年来,高温风机运转良好。能适应多类合金铜生产的要求。
Billet jet preheater is a new technology of steel rolling furnace energy-saving. This article describes an experimental device on the thermal simulation test profile, through a series of experimental test jet device, draw the best choice between the nozzle and the surface of the heating element is: 90 ~ 200 mm, l / d should In the range of 7.7-10.2 selected as well. The flue gas temperature t has a significant effect on the thermal efficiency η. In order to increase the heat quantity of the copper billet in the jet chamber, the temperature drop after the flue gas is released should be minimized. Excessive jet velocity W is not conducive to the improvement of heat utilization, the general maximum jet velocity of 80-100 m / sec is better. From the spray preheating the practical use of production equipment shows that: a substantial reduction in furnace fuel consumption, saving more than 10%. Although the fan power is increased after the device is put into production, the power consumption of the rolling process actually decreases due to the improvement of the steel temperature. Through the copper billet temperature test shows that after the jet device, the billet average preheating temperature up to 170 ~ 200 ℃. Nozzle jet preheater on the environmental protection and labor protection workshop no significant adverse effects. Put into operation in the past six months, high-temperature fan running well. Can adapt to many types of copper alloy production requirements.