Heat transfer property of concentric internally heat integrated distillation column

doi:10.16085/j.issn.1000-6613.2016.08.06

Abstract

Abstract: A calculation method of the overall heat transfer coefficient of concentric internally heat integrated distillation column(HIDiC)is proposed in this study. The method is based on the physical property data of experimental system. The ethanol-water mixture is used as a case to study the self-made pilot-plant concentric HIDiC under different pressure ratio experimentally(1.4—2.6,step is 0.1). The phase transformation to the coefficient of heat is calculated by measured temperature distribution. The overall heat transfer coefficient and heat exchange amount between the two columns sections are computed through experimental temperature in this column. The calculated value of the overall heat transfer coefficient decreases with the increase of the pressure ratio and is shown to be between 300W/(m²·K) and 800W/(m²·K). In the case of operating conditions and product purity consistent with the experimental value,the heat transfer calculation value between rectifying and stripping sections is substituted into software to simulate. The temperature distribution simulated by the calculated value in simulation software is correlated with the experimental temperature. The method of calculating the overall heat transfer coefficient of HIDiC is proved to be practical and effective.

Key words: distillation, column, heat transfer, computer simulation

摘要： 提出了一种以实验物系的物性数据为基础的计算同轴式内部热耦合精馏塔（HIDiC）总传热系数的方法。本文以乙醇-水为实验物系，以自行搭建的中试规模同轴式HIDiC为研究对象，通过在不同压缩比下（1.4~2.6，步长为0.1）的连续操作实验研究，得到塔内的温度分布，通过计算两塔段的相变给热系数来计算该塔的总传热系数和精馏塔段与提馏塔段间的换热量。在同轴式HIDiC中乙醇-水实验物系总传热系数的计算值在300~800W/(m²·K)，并且随着压缩比的增大而逐渐降低。在操作条件和产品纯度与实验值保持一致的情况下，将精馏塔段与提馏塔段间换热量的计算值带入软件中模拟，得到的全塔温度分布与实验中的温度分布在误差范围内吻合良好，证明本文计算同轴式HIDiC总传热系数的方法切实有效。

关键词: 蒸馏, 塔器, 传热, 计算机模拟

CLC Number:

TQ028

FANG Jing, ZHAO Rui, LI Chunli, XUAN Bihan. Heat transfer property of concentric internally heat integrated distillation column[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2342-2349.

方静, 赵蕊, 李春利, 轩碧涵. 同轴式内部热耦合精馏塔的传热性能[J]. 化工进展, 2016, 35(08): 2342-2349.

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