Non-evaporative solvent extraction technology applied to water and heat recovery from low-temperature flue gas: Parametric analysis and feasibility evaluation

Hao Zhang, Yanhua Lai, Xiao Yang, Chang Li and Yong Dong

Energy, 2022, vol. 244, issue PB

Abstract: The performance of solution absorption systems is significantly influenced by the energy consumed during the solution regeneration process when it is applied for water and heat recovery from low-temperature flue gas. Solvent extraction is a non-evaporative technology without phase change that features water solubility sensitive to temperature, which has advantages in energy consumption. In this paper, the high-concentration CaCl2 solution is selected as the liquid desiccant and the feasibility of three amines used for water extraction is explored. The results show that diisopropylamine has the highest water recovery efficiency of 4.1% and that N,N-dimethylcyclohexylamine has the highest salt removal efficiency of >99%. The influence of the stirring intensity and volume ratio on the water recovery performance is also researched with diisopropylamine as the solvent. Simulation results show that compared with the evaporative regeneration method, the energy consumption of the solvent extraction method is reduced by 22.7–51.6%. A coefficient of performance (COP) of 1.71 is achieved in the novel solution absorption system, which utilizes solvent extraction for solution regeneration.

Keywords: Coal-fired flue gas; Water and heat recovery; Absorption heat pump system; Solvent extraction (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:244:y:2022:i:pb:s0360544221033119

DOI: 10.1016/j.energy.2021.123062

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