化学工业所涉及的行业多,产品范围广、用途多、产量大,是国民经济各部门中消耗能源较高的部门之一。世界各国化工生产的能耗约占工业生产总能耗的20％,而能量的利用率却不高。以日本为例,化学工业1980年能量的最终需用量用石油按发热量基准换算为3.98亿千升,其中50％是作为废热未加以利用而排入环境中的。假如能回收其 The chemical industry involves many industries, a wide range of products, many uses, large output, is one of the departments in the national economy consuming more energy. The energy consumption of chemical production in countries in the world accounts for about 20% of the total energy consumption of industrial production, but the utilization rate of energy is not high. In Japan, for example, the final use of energy in the chemical industry in 1980 was 398 million liters on a caloric basis for oil, of which 50% was discharged into the environment as unused waste heat. If you can recover it