摘要
在开展工业余热回收利用的实践活动中,对余热进行高效的采集是余热利用的第一步。从火积的定义入手推导取热水供水温度与系统火积耗散之间的关系,得出提高取热水供水温度可以减少系统的火积耗散的结论。简要阐述了夹点优化法的原理,并在夹点优化法的基础上提出了复合热源和热泵提升等2种采集优化方法。这2种方法可有效减少余热热源的不完善度并提高取热水供水温度,从而减少采集系统火积耗散。以河北省某淀粉类制品厂的余热回收供暖设计方案为例,在不使用优化方法的情况下取热水供水温度仅为45℃,在使用复合热源优化方法的情况下取热水供水温度提高到66.4℃,在使用热泵提升优化方法的情况下取热水供水温度达到了82℃。
Eefficient collection of waste heat is the first step of waste heat utilization in the practice of industrial waste heat recycling.The relationship between temperature of primary side water supply and entranspy dissipation of the system is derived from the definition of entranspy.The relationship concludes that raising the temperature of primary water supply can reduce entranspy dissipation of the system.Recombination of heat sources and using heat pump to raise the temperature are taken out on the basis of the principle of pinch analysis.The both methods can effectively reduce the heat source imperfection and increase the temperature of primary side water supply,so that reduce entranspy dissipation of the system.Waste heat recovery heating design scheme of a starch products factory in hebei province is taken as an example.Temperature of primary side water supply is only 45℃without optimization.However,the temperature of primary side water supply is 66.4℃when recombination of heat sources is used and the temperature is 82℃when using heat pump raise the temperature.
作者
郭少欣
张杰
罗昊敏
GUO Shao-xin;ZHANG Jie;LUO Hao-min
出处
《节能》
2020年第3期95-99,共5页
Energy Conservation
关键词
低品位工业余热
集中供暖
火积分析
夹点优化法
热源整合
low-grade industrial waste heat
central heating
entransy analysis
modified pinch technology
heat integration
