余热
热交换器
热交换器中的铜
废物管理
余热回收装置
可再生能源
热回收通风
火用
环境科学
混合热
天然气
采暖系统
环境工程
核工程
板式换热器
板翅式换热器
工程类
机械工程
作者
Fangtian Sun,Lijiao Cheng,Lin Fu,Junwei Gao
标识
DOI:10.1016/j.applthermaleng.2017.07.134
摘要
To efficiently recover low temperature industrial waste heat, a new low temperature industrial waste heat district heating system based on natural gas fired boilers with absorption heat exchangers was proposed, and also analyzed from the perspective of thermodynamics and economics. In heating substations, absorption heat exchangers are used to greatly decrease the return water temperature of the primary heating network. The lower temperature return water helps to efficiently recover waste heat in heating station and greatly increase economic heat transmission distance. Annual primary energy efficiency and product exergy efficiency of the new district heating system are 215.0% and 42.5% respectively. When waste heat price and heat transmission heat distance are 25 ¥/GJ and 60 km respectively, its heating cost and investment recovery period are 6 ¥/GJ and 0.7 years respectively lower than that of current district heating systems based on natural gas fired boilers. Characterized by better thermodynamic performance and economic benefit, the new district heating system would be promising for low-temperature industrial waste heat recovery.
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