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随着钢铁企业管理操作水平的提高和节能措施的不断地完善,国内许多连续式轧钢加热炉的燃耗在不断下降。但总的来说轧钢加热的热效率还较低(一般在40％左右)炉子的损耗,目前国内平均一般在550大卡/公斤钢左右,而国外先进的已达300大卡/公斤钢以下。因而节能的潜力还很大。从炉子的热平衡计算中可以看出,除被加热工件的吸热外,热量支出最多的是废气带走的热量和,炉底水管册走的热量。目前炉底水管带走的热量约占总供热量的7～15％左右。如何降低炉底水管的供热量,这是国内外炉子工作者所关注的问题。计算炉底水管吸热量的基本公式是:
With the improvement of management and operation of steel enterprises and the continuous improvement of energy conservation measures, the fuel consumption of many domestic continuous rolling furnaces is declining continuously. However, in general, the heating efficiency of rolled steel is still relatively low (generally about 40%). At present, the average domestic consumption is about 550 kcal / kg of steel, while the advanced foreign ones have reached 300 kcal / kg of steel. Thus the potential for energy saving is still high. Calculated from the heat balance of the furnace, it can be seen that in addition to the heat absorption of the heated workpiece, the heat expenditure and the amount of heat removed from the exhaust pipe are the largest. At present, the heat taken from the bottom pipe takes up about 7-15% of the total heat supply. How to reduce the heat supply at the bottom of the water pipe, which is the concern of domestic and foreign stove workers. The basic formula for calculating the heat absorption of hearth water pipe is: