四产品Kaibel隔壁精馏塔分离丙二醇混合物的模拟与节能分析

doi:10.16085/j.issn.1000-6613.2021-2644

摘要/Abstract

摘要：

研究了包含甲醇、水、丙二醇和二丙二醇四组分混合物的分离问题，针对混合物的特征和分离要求，提出四产品Kaibel隔壁精馏塔的分离工艺，并利用Aspen Plus软件对Kaibel塔进行设计与节能分析。首先，设计了分离四组分混合物的三塔精馏流程（TCD）和热集成三塔精馏流程（HTCD）；其次，开展了四产品Kaibel塔分离四组分混合物的模拟研究，取得了满足分离要求的塔设计参数；最后，采用能量衡算和㶲损失分析相结合的方法，对Kaibel塔的用能特征进行了分析和比较。研究表明，与热集成三塔精馏流程相比，四产品Kaibel塔在操作费用方面不占优势，但在设备投资方面具有明显优势，可以实现在一个塔内四组分的分离，总㶲损失可降低9.41%。

关键词: 蒸馏, Kaibel塔, 丙二醇, ?, 优化设计

Abstract:

The separation of four-component mixtures containing methanol, water, propylene glycol and dipropylene glycol was studied. A new process using four-product Kaibel dividing wall column (Kaibel column) was proposed in terms of the characteristics of the separation system and separation requirements. The design and energy-saving analysis of Kaibel column were performed by Aspen Plus. Firstly, a three-column distillation (TCD) process and a heat-integrated three-column distillation (HTCD) process were proposed to separate four-component mixtures. Secondly, a simulation for separating four-component mixtures via four-product Kaibel dividing wall column was conducted, and the column design parameters that meet the separation requirements were obtained. Finally, the energy consumption features of Kaibel column were analyzed and compared using an approach based on energy balance and exergy loss analysis. The results showed that compared with the heat-integrated three-column distillation process, Kaibel column didn’t have an advantage in terms of operating costs, but had a significant advantage in terms of equipment investment. It permits separation of a four-component mixture into four pure fractions in a column and the total exergy loss can be reduced by 9.41%.

Key words: distillation, Kaibel column, propylene glycol, exergy, optimal design

中图分类号:

TQ028.3

李腾, 张雨新, 林子昕, 别海燕, 安维中. 四产品Kaibel隔壁精馏塔分离丙二醇混合物的模拟与节能分析[J]. 化工进展, 2022, 41(10): 5221-5227.

LI Teng, ZHANG Yuxin, LIN Zixin, BIE Haiyan, AN Weizhong. Simulation and energy-saving analysis for separating propylene glycol mixtures via four-product Kaibel dividing wall column[J]. Chemical Industry and Engineering Progress, 2022, 41(10): 5221-5227.

图/表 15

参考文献 19

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原料条件及分离要求	数值
进料流量/kg·h^-1	10000.0
温度/℃	100.0
质量组成（M/H/P/D）	（0.04，0.045，0.91，0.005）
组分沸点（M/H/P/D）/℃	（64.7，100.0，187.6，231.8）
组分相对挥发度（M/H/P/D）	（22.18，9.24，1.00，0.27）
分离要求
产品纯度（M/H/P/D）/%	（99.9，99.0，99.9，50.0）
回收率（M/H/P/D）/%	（99.9，99.0，99.5，99.9）

原料条件及分离要求	数值
进料流量/kg·h^-1	10000.0
温度/℃	100.0
质量组成（M/H/P/D）	（0.04，0.045，0.91，0.005）
组分沸点（M/H/P/D）/℃	（64.7，100.0，187.6，231.8）
组分相对挥发度（M/H/P/D）	（22.18，9.24，1.00，0.27）
分离要求
产品纯度（M/H/P/D）/%	（99.9，99.0，99.9，50.0）
回收率（M/H/P/D）/%	（99.9，99.0，99.5，99.9）

名称	分类	条件	价格/USD·GJ^-1
冷却水	循环水	30～35℃	0.354
水蒸气	高压蒸汽	254℃，4.1MPa	9.88
	中压蒸汽	184℃，1MPa	8.22
	低压蒸汽	160℃，0.5MPa	7.78
电能	工业用电	—	16.9

名称	分类	条件	价格/USD·GJ^-1
冷却水	循环水	30～35℃	0.354
水蒸气	高压蒸汽	254℃，4.1MPa	9.88
	中压蒸汽	184℃，1MPa	8.22
	低压蒸汽	160℃，0.5MPa	7.78
电能	工业用电	—	16.9

项目	TCD		HTCD		Kaibel塔
项目	(热负荷/功率)/MW	操作费用/10³USD·a^-1	热负荷/功率/MW	操作费用/10³USD·a^-1	热负荷/MW	操作费用/10³USD·a^-1
再沸器	4.06	999.45	2.71	694.01	2.89	740.10
冷凝器	-3.39	31.07	-2.03	18.61	-2.18	19.98
泵	0.00012	0.05	0.00049	0.21	—	—
总计	—	1030.57	—	712.83	—	760.08