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首页> 外文期刊>Jordan Journal of Mechanical and Industrial Engineering >Theoretical Analyses of Energy Saving in Indirect Contact Evaporative Crystallization by Using Combined Cycle of Vapor Recompression Heat Pump and Throttling Valve
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Theoretical Analyses of Energy Saving in Indirect Contact Evaporative Crystallization by Using Combined Cycle of Vapor Recompression Heat Pump and Throttling Valve

机译：蒸汽压缩热泵与节流阀联合循环间接接触蒸发结晶节能的理论分析。

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摘要

The installation of heat pumps in different chemical processes is considered as an important and prospective approach for energy saving. Various crystallization processes such as counter current crystallization, direct and indirect contact crystallization, evaporative crystallization and fractional crystallization from melts are used to be a promising chemical processes where heat pumps can be introduced for the purpose of energy saving. Usually in such processes, two zones are present; a cooling zone, where heat must be removed from the process and a heating zone, where heat must be added to the process. This work presents a theoretical analysis of the technical feasibility and the potential of heat pumps to be used in the process of indirect contact evaporative crystallization. Principle schemes of the process with heat pump and in combination with throttling valve are proposed and the corresponding calculations are performed. The Effect of temperature and initial feed concentration on the energy saving factor are investigated. The average value of this factor was estimated to be 49.6 % when a cooled feed solution enters (T =25 ℃) to the crystallizer. This factor was found to be increased to 70.4 % when the feed solution inters at its boiling point (T=125 ℃).The installation of throttling valve at the outlet of the condensate produces (based on feed conditions) an additional amount of vapor and as a result the saving factor increases from 17 % to 22 %.
机译：在不同的化学过程中安装热泵被认为是节能的重要和前瞻性方法。各种结晶过程，例如逆流结晶，直接和间接接触结晶，蒸发结晶和从熔体中的分步结晶，都是有前途的化学过程，可以引入热泵以节省能源。通常在这样的过程中，存在两个区域。冷却区（必须从过程中去除热量）和加热区（必须在过程中添加热量）。这项工作对间接接触蒸发结晶过程中使用的热泵的技术可行性和潜力进行了理论分析。提出了热泵联合节流阀的工艺原理方案，并进行了相应的计算。研究了温度和初始进料浓度对节能系数的影响。当冷却的进料溶液（T = 25℃）进入结晶器时，该因子的平均值估计为49.6％。当进料溶液在沸点（T = 125℃）时发生交互作用时，该系数增加到70.4％。在冷凝液出口处安装节流阀会产生额外的蒸汽（根据进料条件）。结果，节省系数从17％增加到22％。

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