A novel heat recovery system for flue gas from natural gas boiler

doi:10.3969/j.issn.0438-1157.2013.11.046

›› 2013, Vol. 64 ›› Issue (11): 4223-4230.DOI: 10.3969/j.issn.0438-1157.2013.11.046

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A novel heat recovery system for flue gas from natural gas boiler

LIU Chao, XU Jinliang

Beijing Key Laboratory of Multi-Phase Flow and Heat Transfer of Low-Grade Energy, North China Electric Power University, Beijing 102206, China

Received:2013-04-23 Revised:2013-07-22 Online:2013-11-05 Published:2013-11-05
Supported by:
supported by the National Basic Research Program of China(2011CB710703)and the National Natural Science Foundation of China(51210011).

一种新型天然气锅炉烟气余热回收系统

刘超, 徐进良

华北电力大学低品位能源多相流与传热北京市重点实验室, 北京 102206

通讯作者: 徐进良
作者简介:刘超(1988-),女,硕士研究生。
基金资助:
国家重点基础研究发展计划项目(2011CB710703);国家自然科学基金国际合作项目(51210011)。

Abstract

Abstract: The exhaust flue gas from natural gas boiler(NGB)contains a lot of sensible heat and latent heat,and recycle and utilization of the heat can significantly improve energy efficiency.Based on the heat features of NGB flue gas,a new heat recovery system was proposed to realize recycle and cascade utilization of both latent and sensible heat in the flue gas.In this system,the high grade sensible heat is converted to electric energy by organic Rankine cycle(ORC),while the low grade sensible heat and latent heat recovered by condensation of working fluids and absorption of cooling water.A thermodynamic and economic model is established to evaluate the system performance.The results show that,thermal efficiency of natural gas boiler equipped with the heat recover unit increase by 11% under the reference conditions,and payback period of the unit is about 1.2 years,and the net present value is approximately 4.32 million CNY after five years.Based on this performance evaluation,effects of main operating parameters on system thermodynamic and economic performance are analyzed,which can provide a foundation for optimization of the system.

Key words: natural gas, waste heat recovery, latent heat, organic Rankine cycle, net present value, thermodynamics, exergy

关键词: 天然气, 余热回收, 潜热, 有机朗肯循环, 净现值, 热力学, (火用)

CLC Number:

TK123
TK09

LIU Chao, XU Jinliang. A novel heat recovery system for flue gas from natural gas boiler[J]. , 2013, 64(11): 4223-4230.

刘超, 徐进良. 一种新型天然气锅炉烟气余热回收系统[J]. CIESC Journal, 2013, 64(11): 4223-4230.

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A novel heat recovery system for flue gas from natural gas boiler

一种新型天然气锅炉烟气余热回收系统

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