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一、利用低品位余热意义重大充分利用余热是节能工作的重要内容之一,我国目前可供开发利用的工业余热折合标准煤约占煤年产量的3％左右,数量相当可观。而在余热资源中,低位热能占一半以上,解决低位热能的利用问题,对节能具有重要意义。但从理论上看,低位热源温度较低,(火用)(可用能)值小,余热利用的经济性也就不高,必须从技术上不断改进,以尽可能地减少投资,才能做到既有社会效益,又有经济效益。目前低位余热的利用主要有两种方法,一是直接利用其热能来加热;二是用来驱动低沸点工质透平以发电。而对温度在80℃以下热水形式的热能,上述两种方法尚有困难,往往
First, the use of low-grade waste heat of great significance to make full use of waste heat is an important part of energy-saving work, China is currently available for development and utilization of industrial waste heat equivalent to about 3% of coal annual coal output, the number is considerable. In the waste heat resources, low heat accounts for more than half, to solve the problem of low heat utilization, energy saving is of great significance. However, theoretically, the lower the heat source temperature is low, (exergy) (available energy) value is small, the economy of waste heat utilization is not high, we must continue to improve the technology to minimize investment in order to be able to do Both social and economic benefits. At present, there are mainly two ways to make use of the low residual heat. One is to directly use its thermal energy for heating; the other is to drive the low boiling point working fluid to generate electricity. However, for the thermal energy in the form of hot water below 80 ° C, the above two methods still have difficulties, often