共查询到19条相似文献,搜索用时 187 毫秒
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热泵式舰船海水淡化装置 总被引:1,自引:0,他引:1
对利用热泵的蒸发器和冷凝器作为海水淡化装置的冷、热源进行海水淡化的热泵式舰船海水淡化装置进行了理论计算和分析,通过计算比较,认为以水蒸气作为工质的压缩式热泵作为海水淡化装置的热源是可行的,与目前使用的电力压缩式海水淡化装置比较,能耗小并且可以减小对环境的热污染。 相似文献
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为提升增湿除湿海水淡化装置性能,提出一种两级增湿除湿热泵海水淡化系统,由二级增湿器回收利用一级增湿器排出的海水余热,改善海水与湿空气热质交换效果。利用Aspen Plus仿真软件分别建立了一级增湿和两级增湿的热泵海水淡化系统模型,针对不同进料海水温度和液气质量比以及热泵制冷剂流量进行多工况仿真研究,根据仿真结果的对比分析,总结得出:随着进料海水温度和液气质量比的增加,两级增湿系统的回收率和造水比均是优于一级增湿系统,且两级增湿系统达到最佳系统性能所需进料海水的温度和循环空气的流量要低于一级增湿系统,表明热泵两级增湿除湿海水淡化技术具有较大的性能提升和广阔的应用前景。 相似文献
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提出了单效溴化锂吸收式热泵低温多效蒸发海水淡化系统,建立了系统数学模型。分析了不同溴化锂浓溶液浓度对系统的影响,并与不带吸收式热泵的低温多效蒸发海水淡化系统进行了性能与经济比较。计算结果表明:在本文的计算范围内,随LiBr浓溶液浓度的增加,发生器产生的饱和蒸汽温度降低,所需动力蒸汽量减少,造水比升高,海水淡化装置蒸发器总面积增加,综合效果是淡水成本增加。在相同条件下,与不带吸收式热泵的海水淡化系统相比,吸收式热泵海水淡化系统的淡水成本可节省16.5%。 相似文献
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针对大型海水淡化工程设计关键技术,依托1 t·d-1低温多效蒸发海水淡化实验平台,考察了装置运行性能的稳定性,系统地研究了不同海水进料量及首效蒸汽温度对造水比、浓缩比和产品水质等关键参数的影响。结果表明:在实验条件范围内,随着首效蒸汽温度提高,海水的浓缩比先减小后增加,而首效温度对造水比的影响较小;在一定首效温度下,浓缩比随着海水进料量的增大而减小,而造水比随海水进料量的增大而增大。在实验范围内,产品水的固体总溶解浓度均低于5 ppm。小型海水淡化平台关键技术的实验研究为低温多效海水淡化系统在扩大化中的设计优化提供了参考和借鉴。 相似文献
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Performance prediction of hydraulic energy recovery (HER) device with novel mechanics for small-scale SWRO desalination system 总被引:1,自引:0,他引:1
The biggest proportion of the cost of desalted water is the energy consumption, especially for small-scale SWRO desalination system. In order to decrease the cost of desalted water, the energy recovery device is preferred to be considered in small-scale SWRO desalination system. However, the investigation of energy recovery device for small-scale SWRO system is scarce. Until now the design of energy recovery device has not been based on the results of the mathematical simulation but almost on experimental and empirical knowledge, and there are few detailed reports about the optimal design of energy recovery device for small-scale SWRO desalination system in previous articles. In the current paper, a hydraulic energy recovery (HER) device with novel mechanics is introduced, the detailed simulation results of the HER device and specific energy consumption of small-scale SWRO system equipped with the HER device are presented. The simulated results are very useful for optimal design of the HER device and its coupling SWRO desalination system. 相似文献
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反渗透海水淡化系统的优化设计 总被引:5,自引:0,他引:5
对反渗透海水淡化过程的设计进行了研究。首先对过程的每个单元给出了单元操作模型和相关的经济模型。通过一定的变量将这些模型相互关联,组成系统模型。系统模型主要考虑了一级流程和二级流程。将年费用最小定为目标函数,并满足过程热力学、设备选型、设计要求等约束。系统的设计问题可表达为一个混合整数非线性规划(MINLP)。当产品水的设计要求不同,给水浓度不同时,采用本文的设计方法分别得出了不同的最优设计方案。这个方法可用于海水、苦咸水淡化的工程设计,也可用于高浓度含盐废水的脱盐工艺设计。 相似文献
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Desalination with humidification and dehumidification process is deemed as an efficient and promising means of utilizing the condenser and evaporator of heat pump to produce freshwater from seawater. This paper presents a new type desalination unit driven by mechanical vapor compression pump which was designed and fabricated by the Institute of Air-Conditioning & Solar Energy of the Northwestern Polytechnical University. The unit utilized the heat from condenser and the cold from evaporator of heat pump adequately, and reclaimed most latent heat. The air, firstly, was humidified in the humidifier with the alveolate structure, and then was cooled in the precondenser and the evaporative condenser to produce freshwater. A mathematical model of the unit is presented, in which the hydrokinetics method was used to study the flow and the heat and mass transfer inside the alveolate humidifier. The effects of some of the operation such as flow rates, temperatures of cooling water and air, and etc., were studied in detail. The comparison between the numerical and experimental results was accepted. The desalination unit that is considered in the study produces freshwater 60 kg/day with the less electric power that is 500W and is proven to be an efficient desalination device to obtain freshwater. 相似文献
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阐述了太阳能海水淡化与组合式空调系统的原理,该系统具有高效的海水淡化功能和空调除湿能力.比较了多个现有的控制器,对该装置的控制系统做出了初步设计并进行了实验验证.最终的实验结果证实该控制器完全可行. 相似文献
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华能玉环电厂的淡水系统全部采用了世界先进的“双膜法”海水淡化技术,工程投资约2亿元,计划2006年4月30日制出合格的淡水。本文以华能玉环电厂海水淡化工程实例为基础,根据国内外海水淡化发展的新技术以及经验,分析对比了高压泵的选型、能量回收装置的特点,以及回收率确定的几项因素,并根据工程情况分析了制水成本。对缺乏淡水的沿海电厂来说采用海水淡化无疑是一种非常好的选择方案。 相似文献
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Jinzeng Chen 《Desalination》2004,169(2):161-165
The paper, “Heat pumps as a source of heat energy for desalination of seawater”, was published in Desalination [Vol. 139, 2001]. In the paper, heat pumps using agent R12 or water and vapor were introduced to be used as a source of heat energy for desalination. The cyclic processes of heat pump were illustrated in T-S and P-H thermodynamic diagrams under the conditions ofcondensation temperature at 120°C and an evaporative temperature of 20°C, but there are some questions that need to be discussed. First, thermodynamic diagrams of the transcritical cycle of heat pumps using agent R12 are given. Second, the ratio between mass flows of the water vapor and agent R12 is discussed and the heat balance equations of desalination are given. Third, calculations from a 5 t/d desalination plant are given as an example. 相似文献