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提出了两级吸收式热泵多效蒸发海水淡化工艺流程,并建立了系统的数学模型。计算分析了溴化锂溶液浓度和加热蒸汽温度对系统的造水比、生产单位淡水所需传热面积和吸收式热泵的热力系数的影响。研究结果表明,系统的造水比和吸收式热泵的热力系数随加热蒸汽温度和LiBr浓溶液浓度的降低而增大,生产单位质量淡水所需传热面积随加热蒸汽温度的降低而急剧增加;通过调整溴化锂溶液的浓度,能够实现对不同品质热源的利用;该系统不仅能够保证淡水不被溴化锂污染,而且其造水比明显优于喷射泵多效蒸发系统和多效蒸发系统。
A two-stage absorption heat pump multi-effect evaporation desalination process is proposed, and a mathematical model of the system is established. The effect of lithium bromide solution concentration and heating steam temperature on the system water production ratio, the heat transfer area required for fresh water production and the thermal coefficient of the absorption heat pump were calculated and analyzed. The results show that the ratio of water making system and the heat coefficient of absorption heat pump increase with the decrease of heating steam temperature and concentration of concentrated LiBr solution, and the heat transfer area required per unit mass of fresh water increases sharply with the decrease of heating steam temperature. By adjusting the concentration of lithium bromide solution, the utilization of different quality heat sources can be realized. The system can not only ensure that fresh water is not contaminated by lithium bromide, but also has a significantly better water-making ratio than jet pump multi-effect evaporation system and multi-effect evaporation system.