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一、余热回收的意义和装置我国是能源生产大国,煤炭的年产量已为世界之冠。据报载,1989年我国煤炭产量达10.4亿吨,超过美国的10.2亿吨,使美国领先达100年之久的第一位屈居第二位。但是,我国又是能源浪费大国,能源的利用率很低。我国工业炉窑是能耗大户,约占全国能耗的1/4。但工业炉窑的热效率的平均值很低,只有30％左右。而以高温烟气形式排放的余热量,占其总能耗量为30～50％。估计余热资源量在年耗煤量为10亿吨时约有7000多万吨标煤,存在相当丰富的余热资源。目前我国的余热资源的回收率仅20～30％,
First, the significance of waste heat recovery and equipment China is a large energy producer, the annual output of coal has been the highest in the world. It is reported that in 1989 China’s coal output reached 1.04 billion tons, surpassing the 1.02 billion tons in the United States and ranking the United States as the number one place ahead of the 100-year mark. However, our country is again a big waste of energy and has a very low energy utilization rate. China’s industrial furnace is a large energy consumption, accounting for about 1/4 of the country’s energy consumption. However, the average thermal efficiency of industrial furnaces is very low, only about 30%. Exhaust heat discharged in the form of high-temperature flue gas accounts for 30% to 50% of the total energy consumption. Estimated waste heat resources in the annual consumption of 1 billion tons of coal about 7000 million tons of standard coal, there is a considerable abundance of waste heat resources. At present, the recovery rate of waste heat resources in China is only 20 to 30%