水泥窑及生料立磨余热深度利用技术研究

Study on full recovery of waste heat from cement kiln and raw mill

为了充分利用水泥回转窑和窑尾排放烟气的余热,基于水泥生产线的工艺特点,笔者以5 000t/d水泥生产过程为例,建立了适应该余热条件的数学模型,对水泥回转窑和窑尾排放烟气的热损失进行分析研究。研究结果表明,水泥回转窑筒体表面散失的热量达到2 500 kW,并且每小时可将15 t35℃热水加热至80℃;将窑尾烟气温度由230℃降至165℃,发电功率增加了1 692.8 kW,节能效果显著,经济效益明显提高。

In order to make full use of the waste heat of flue gas from the cement rotary kiln and the kiln rear,a mathematical model suitable for the waste heat condition was established based on technological characteristics of the cement production line,and the heat loss of the flue gas from the cement rotary kiln and the kiln rear was analyzed and calculated in detail.The results showed that the heat loss on the shell surface of 5 000 t/d cement rotary kiln reached 2 500 kW,which could heat 15 t water from 35 ℃ to 80 ℃ per hour.The heated water could be applied to heating in winter,which had obvious energy-saving effects.In addition,the temperature of the flue gas decreased from the kiln rear from 230 ℃ to 165 ℃,which brought about increase of 1 692.8 kW in generating power,the economic benefits increased significantly.