Abstract
Based on an example of a gas-fired boiler for an industrial user in Tianjin, the absorption heat pump technology was used to carry out energy-saving transformation of the above boiler. The actual test was carried out on the gas flow, exhaust gas temperature and other parameters from January 2, 2018 to February 26, 2018. And then, the thermal efficiency of the boiler was analysed. The results show that after the energy-saving transformation, the exhaust gas temperature of the gas-fired boiler can be reduced from 140 °C to about 40 °C, and the overall thermal efficiency of the boiler also rises from 89.5% to 101.3%, which is 13.2% higher than that before optimization. According to the economic analysis, the energy-saving reconstruction project can achieve an energy-saving economic benefit of 1.598 million yuan throughout the year, with obvious energy-saving and emission reduction benefits.
Highlights
By the end of 2016, the total urban and rural heating area in northern China is about 20.6 billion square meters, of which the urban central heating area is about 14.1 billion square meters[1]
This paper mainly focuses on the traditional gas-fired boiler hightemperature flue gas waste heat recovery research, according to the existing absorption heat pump technology, combined with an absorption heat pump project in Tianjin to recover gas-fired boiler flue gas waste heat
In order to solve the problems of corrosion and low efficiency at the same time, the absorption heat pump technology[10-12] is applied to the condensation heat recovery device of flue gas
Summary
By the end of 2016, the total urban and rural heating area in northern China is about 20.6 billion square meters, of which the urban central heating area is about 14.1 billion square meters[1]. With the popularization of natural gas and the decline of natural gas price, the effective recovery and utilization of the latent heat of steam vaporization generated by natural gas combustion is of great energy saving significance, and of great economic significance. ICEMEE 2021 other excess air coefficients are used, the condensation temperature of flue gas will be higher At this time, in the field of heating, especially in the field of district heating, the water supply temperature of heat supply network varies with different heat users, but the return water temperature is generally above 50 ~ 60 °C. The return water in this temperature range cannot realize the effective recovery of the latent heat of water vapour vaporization in flue gas, forming a condensing boiler, which cannot be directly applied in the field of district heating. It can be seen that the recovery of flue gas condensation heat for heating boilers has great economic and social benefits
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