Journal
APPLIED ENERGY
Volume 207, Issue -, Pages 613-623Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2017.05.169
Keywords
Gas-fired boiler; Total heat recovery; Flue gas; Non-contact heat exchanger; Tech-economic analysis
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Funding
- Innovative Research Groups of the National Natural Science Foundation of China [51521005]
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Recovering heat from the flue gas of a gas-fired boiler can both improve boiler efficiency and decrease pollutant emissions. To improve the efficiency of the gas-fired boiler in a more cost effective and higher efficient way, a non-contact total heat recovery (NCHR) system is proposed for recovering heat from flue gas for use in heating and humidifying the oxidizing air of the boiler. A mathematical model of a boiler with an NCHR system was established, and the performance of the NCHR system was compared with that of other heat recovery systems. It is shown that the efficiency of a boiler with an NCHR system can reach 103.4% for an inlet oxidizing air temperature of 0 degrees C, which is 13.4% higher than the efficiency of a traditional boiler. According to the case study, the energy saving potential of a boiler with an NCHR system is 12.97% compared to that of a traditional boiler. As for the economic analysis, the payback period of a boiler with an NCHR system to traditional boiler and the condensing boiler is 1 year and 3 years, respectively. In addition, the operation cost of an NCHR system is less than that of a boiler with an absorption heat pump for heat recovery (AHPB) system, indicating that the NCHR system has obvious economic benefits. (C) 2017 Elsevier Ltd. All rights reserved.
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