一、前言 工厂排放的余热中有60％左右是100℃以下的中低温热水,有效利用这部分热水,无论对节能还是对保护环境都是十分重要的。但就现在的技术水平来看,进行这一工作的投资回收年限太长,因此,这些热水都不加利用地排放掉了。这里所说的投资回收年限,是指利用废水余热发电的设备投资与运行费用之和用发电收入进行回收所需要的时间。这对节能来说是一个十分重要的指 I. INTRODUCTION About 60% of waste heat discharged by factories is medium and low temperature hot water below 100 ° C. Making effective use of this part of hot water is very important for saving energy and for protecting the environment. However, judging from the current technological level, the investment recovery period for carrying out this work is too long, and therefore these hot water are not used up and discharged. Referred to here as the investment recovery period, refers to the use of waste heat power generation equipment investment and operating costs and recovery of generating income from the time required. This is a very important indicator of energy saving