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    王俊, 黄秀辉, 崔国民. 碘硫循环制氢中HI浓缩精馏的模拟[J]. 华东理工大学学报(自然科学版), 2020, 46(1): 92-99. DOI: 10.14135/j.cnki.1006-3080.20180927003
    引用本文: 王俊, 黄秀辉, 崔国民. 碘硫循环制氢中HI浓缩精馏的模拟[J]. 华东理工大学学报(自然科学版), 2020, 46(1): 92-99. DOI: 10.14135/j.cnki.1006-3080.20180927003
    WANG Jun, HUANG Xiuhui, CUI Guomin. Simulation of HI Concentration Distillation in Hydrogen Production of Iodine Sulfur Cycle[J]. Journal of East China University of Science and Technology, 2020, 46(1): 92-99. DOI: 10.14135/j.cnki.1006-3080.20180927003
    Citation: WANG Jun, HUANG Xiuhui, CUI Guomin. Simulation of HI Concentration Distillation in Hydrogen Production of Iodine Sulfur Cycle[J]. Journal of East China University of Science and Technology, 2020, 46(1): 92-99. DOI: 10.14135/j.cnki.1006-3080.20180927003

    碘硫循环制氢中HI浓缩精馏的模拟

    Simulation of HI Concentration Distillation in Hydrogen Production of Iodine Sulfur Cycle

    • 摘要: 针对碘硫循环制氢中碘化氢(HI)浓缩分离的精馏问题,选用NRTL(Non-Random Two-Liquids)模型来修正HI-I2-H2O三元混合体系的液相非理想性。结合H2O-HI、H2O-I2和HI-I2体系气液相平衡的实验数据,采用极大似然法关联该三组体系NRTL模型表达式中的二元交互作用参数。基于已确定参数的NRTL热力学模型,借助模拟软件Aspen Plus对HI浓缩精馏塔进行模拟设计,并通过灵敏度分析,分别考察了HI精馏塔的塔板数、回流比、进料组分等关键操作参数对分离效果和能耗的影响,得到了优化后的操作参数,为工业碘硫循环制氢过程工艺研究提供理论基础和指导。

       

      Abstract: In the hydrogen production of iodine-sulfur cycle, a distillation problem of HI concentration separation was selected for the analysis. The NRTL model was used to modify the liquid non-ideal of the ternary mixture of HI-I2-H2O system, the two groups of NRTLs were obtained by fitting the binary gas-liquid equilibrium experiment data of H2O-HI, H2O-I2 and HI-I2 model of binary interaction parameters. The comparison between the H2O-HI vapor-liquid equilibrium phase diagram was predicted by the obtained binary interaction parameters and the experimental data showed that the prediction results were in good agreement with the experimental data, and the accuracy and reliability of the obtained binary interaction parameters were verified. The optimized operating conditions were obtained by systematic analyses and simulation of the HI rectification column by means of simulation software Aspen Plus. As the number of trays increases, the Qm of the reboiler heat load per unit mass fraction decreases overall, but when the number of trays increases more than 13, the Qm decreases slowly, then the 13th was the most suitable tray. As the reflux ratio increases, the Qm of the reboiler heat load per unit mass fraction increases uniformly at a constant rate. When the reflux ratio is 1.3, the mass fraction of HI distilled has reached 0.96. After that, as the reflux ratio increases, the increase of HI distillate is not obvious. Considering that the reflux ratio is too large, the operating cost and equipment cost will also be increased, indicating that the best reflux ratio was 1.3. The HI mass fraction in the feed needs to be optimized by a specific simulation to obtain an optimum value, and the HI mass fraction and energy consumption of the discharge are not monotonous. The discussion of the number of plates, reflux ratio and feed composition on the separation conditions provides the theoretical basis for the further study of industrial iodine sulfur cycle hydrogen production process.

       

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