Analysis of condensation waste heat recovery system of spray flue gas source heat pump

被引：0
|
作者：
Zhang Q. [1 ,2 ]
Huang H. [1 ]
Zhang L. [1 ]
Zhao W. [1 ]
Zhang Q. [1 ,2 ]
机构：
[1] Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing
[2] Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 02期
关键词：
flue gas; gas boiler; heat pump; spray condensation; waste heat recovery;
D O I：
10.16085/j.issn.1000-6613.2022-0637
中图分类号：
学科分类号：
摘要：
Restricted by the construction environment of the boiler, the back water of heat network is the most easily obtained cold source for waste heat recovery. However, the high back water temperature limits the recovery of the latent heat. In order to achieve high-efficiency total heat recovery, a flue gas condensation waste heat recovery system coupled with a direct contact heat exchanger and a compression heat pump was proposed, which aimed to create an artificial cold source through the heat pump’s ability to extract low-grade heat energy to meet the requirement of temperature for latent heat recovery. The waste heat recovery capacity and heating capacity of the system were experimentally studied under the condition of variable inlet water flow and temperature of the heat network back water at the inlet of the heat pump condenser. The results showed that, based on the minimum calorific value of the input gas, the heating efficiency of the system under all working conditions exceeded 100%, and the system had excellent heating capacity. Under the condition of back water temperature of 50°C and flow rate of 40L/min at the inlet of the heat pump condenser, the exhaust gas temperature of the system could be reduced to 26.9°C, and the waste heat recovery efficiency could reach 13.85%. At this time, the condensation amount of water vapor in the flue gas was 6.5—7kg/h. It could save about 1966.42m3 of gas every year, and the investment payback period was about 3.33 years, which proved that the system had excellent energy saving and economic benefits. © 2023 Chemical Industry Press. All rights reserved.
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页码：650 / 657
页数：7
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