Total heat recovery of gas boiler by absorption heat pump and direct-contact heat exchanger

被引：96
|
作者：
Zhu, Kan [1 ]
Xia, Jianjun [1 ]
Xie, Xiaoyun [1 ]
Jiang, Yi [1 ]
机构：
[1] Tsinghua Univ, Sch Architecture, Dept Bldg Sci, Beijing, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2014年 / 71卷 / 01期
关键词：
Heat recovery; Condensing heat; Gas boiler; Absorption heat pump; Direct-contact heat exchanger; CONDENSING BOILERS; FIRED BOILER; SYSTEM;
D O I：
10.1016/j.applthermaleng.2014.06.047
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper presents a new technology which combines the absorption heat pump and the direct-contact heat exchanger. Based on the analysis of natural gas features and thermal efficiency of the gas boilers, it analyzes existing and new techniques for heat recovery, focusing upon removing heat from the flue gas to a point where it can be below the dew point as significant to realizing the total heat recovery for the gas boiler. Through field test and experimental analysis of an actual case in a district heating system operating at various system load, this paper strives to identify challenges related to high return water temperature, achieving a low-temperature cold source, and enhancing the heat transfer effect; while observing if the system performance is satisfactory, and whether the system can achieve very stable performance under different working conditions and realize the total design heat capacity improvement of 12%. Data will be examined for boiler load and its influences on the condensing rate with suggestions for further improvements. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：213 / 218
页数：6
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