In 2013, about 66% of the total energy in China is supplied by coal, 18.4% by petroleum and 5.8% by natural gas. The humidity ratio of the exhaust gas differs according to the type of fuels as the fuel with higher hydrogen content will produce more water vapor during combustion. The latent heat occupies a large proportion of the total exhaust heat and will contribute a lot to energy saving if fully utilized. This paper introduces a system used for waste heat recovery from flue gases with the liquid desiccant serving as circulatory mediator.
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