多储罐间歇精馏液相串联操作及其能量集成的研究
发布时间：2018-10-22 07:01
【摘要】：针对所需理论塔板数较多的精密精馏,本文提出了多储罐间歇精馏液相串联操作(CMVBD)。该操作具有如下特点:(1)系统由多个多储罐间歇精馏塔组成;(2)各塔独立进行全回流操作,仅通过各储罐内持液的液相交换实现串联操作;(3)系统的总压降仅为单塔压降;(4)能够有效减弱返混现象对分离过程的不利影响。为了克服CMVBD系统能耗高的缺点,进一步设计了基于蒸汽再压缩的多储罐间歇精馏液相串联操作(VRCMVBD)。而且采用模拟和实验方法对CMVBD和VRCMVBD进行了深入研究。在多储罐间歇精馏全回流操作(MVBD)基础上结合液相串联操作,构建了CMVBD。首先对MVBD进行了模拟和实验研究,结果表明其具有高效省时的优点,适合分离相对挥发度较小或轻组分含量较低的难分离二元混合物。进而研究了CMVBD,对其操作过程进行了数值模拟,结果表明CMVBD系统能够实现难分离物系的高效分离;设计了CMVBD的实验系统,采用相对挥发度较小的乙醇-异丙醇二元物系进行分离实验,实验结果和模拟数据的变化规律一致,证明其数值模拟准确可靠,并且说明CMVBD具有良好的可行性和可操作性。为了降低CMVBD系统操作能耗,首先对其基本操作单元——MVBD的能量集成方案进行研究,提出了基于蒸汽再压缩的多储罐间歇精馏全回流操作(VRMVBD)和带有内部热集成的多储罐间歇精馏全回流操作(IHIMVBD)及其强化形式(Int-IHIMVBD)。通过模拟分离乙醇-正丙醇的实例表明,VRMVBD不仅能显著降低操作能耗并提高经济效益,而且结构简单,易于设计实施。根据以上研究结果,将蒸汽再压缩技术应用于CMVBD系统,设计了基于蒸汽再压缩的多储罐间歇精馏液相串联操作(VRCMVBD)。该操作利用压缩机将塔顶蒸汽压缩到较高的压力,使其在塔釜再沸器处冷凝,释放出的潜热供给塔釜料液再沸,从而实现塔顶低温位热量的再利用。根据压缩机的运转方式,VRCMVBD可分为定速VRCMVBD和变速VRCMVBD。通过模拟分离乙醇-异丙醇的实例表明,VRCMVBD能够完成精密精馏分离任务并且大幅降低操作能耗和分离成本,而且变速VRCMVBD比定速VRCMVBD更具优势。
[Abstract]:In order to solve the problem of precision distillation with more theoretical trays, the liquid phase series operation (CMVBD). For batch distillation of multiple storage tanks is presented in this paper. The operation has the following characteristics: (1) the system is composed of a plurality of batch distillation columns for multiple storage tanks; (2) each column carries out the operation of total reflux independently. The series operation is realized only by liquid exchange of liquid holdup in each tank; (3) the total pressure drop of the system is only single tower pressure drop; (4) the adverse effect of backmixing on the separation process can be effectively reduced. In order to overcome the shortcoming of high energy consumption in CMVBD system, a series operation (VRCMVBD). For batch distillation of multi-tank was designed based on steam recompression. CMVBD and VRCMVBD are studied by simulation and experiment. On the basis of batch distillation total reflux operation (MVBD) in multi-tank, combined with liquid-phase series operation, CMVBD. was constructed. The simulation and experimental results of MVBD show that it has the advantages of high efficiency and time saving and is suitable for the separation of binary mixtures with low relative volatility or low light component content. Furthermore, the numerical simulation of the operation process by CMVBD, is studied. The results show that the CMVBD system can achieve the efficient separation of the difficult separation system, and the experimental system of CMVBD is designed. The separation experiment was carried out by using ethanol-isopropanol binary system with low relative volatilization. The experimental results were consistent with the simulation data, which proved that the numerical simulation was accurate and reliable, and that CMVBD had good feasibility and maneuverability. In order to reduce the operation energy consumption of CMVBD system, the energy integration scheme of MVBD, its basic operating unit, is studied firstly. In this paper, (VRMVBD) for batch distillation of multi-tank and (IHIMVBD) with internal heat integration for batch distillation of multi-storage tank and its enhanced form (Int-IHIMVBD) are proposed. An example of simulated separation of ethanol-n-propanol shows that VRMVBD not only can significantly reduce the energy consumption and increase the economic benefit, but also has a simple structure and is easy to design and implement. Based on the above results, the steam recompression technology was applied to CMVBD system, and a series operation (VRCMVBD). Was designed for batch distillation liquid-phase operation in multi-tank based on steam recompression. In this operation, the top steam is compressed to a higher pressure by the compressor, which is condensed at the reboiler of the tower, and the latent heat is released to the reboiling of the feedstock of the tower, so as to realize the reutilization of the heat at low temperature at the top of the tower. According to the operation mode of compressor, VRCMVBD can be divided into fixed speed VRCMVBD and variable speed VRCMVBD.. An example of ethanol / isopropanol separation shows that VRCMVBD can accomplish the precision distillation separation task and greatly reduce the operating energy consumption and separation cost. Moreover, the variable speed VRCMVBD is superior to the constant speed VRCMVBD.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TQ028.31
本文编号：2286441
[Abstract]:In order to solve the problem of precision distillation with more theoretical trays, the liquid phase series operation (CMVBD). For batch distillation of multiple storage tanks is presented in this paper. The operation has the following characteristics: (1) the system is composed of a plurality of batch distillation columns for multiple storage tanks; (2) each column carries out the operation of total reflux independently. The series operation is realized only by liquid exchange of liquid holdup in each tank; (3) the total pressure drop of the system is only single tower pressure drop; (4) the adverse effect of backmixing on the separation process can be effectively reduced. In order to overcome the shortcoming of high energy consumption in CMVBD system, a series operation (VRCMVBD). For batch distillation of multi-tank was designed based on steam recompression. CMVBD and VRCMVBD are studied by simulation and experiment. On the basis of batch distillation total reflux operation (MVBD) in multi-tank, combined with liquid-phase series operation, CMVBD. was constructed. The simulation and experimental results of MVBD show that it has the advantages of high efficiency and time saving and is suitable for the separation of binary mixtures with low relative volatility or low light component content. Furthermore, the numerical simulation of the operation process by CMVBD, is studied. The results show that the CMVBD system can achieve the efficient separation of the difficult separation system, and the experimental system of CMVBD is designed. The separation experiment was carried out by using ethanol-isopropanol binary system with low relative volatilization. The experimental results were consistent with the simulation data, which proved that the numerical simulation was accurate and reliable, and that CMVBD had good feasibility and maneuverability. In order to reduce the operation energy consumption of CMVBD system, the energy integration scheme of MVBD, its basic operating unit, is studied firstly. In this paper, (VRMVBD) for batch distillation of multi-tank and (IHIMVBD) with internal heat integration for batch distillation of multi-storage tank and its enhanced form (Int-IHIMVBD) are proposed. An example of simulated separation of ethanol-n-propanol shows that VRMVBD not only can significantly reduce the energy consumption and increase the economic benefit, but also has a simple structure and is easy to design and implement. Based on the above results, the steam recompression technology was applied to CMVBD system, and a series operation (VRCMVBD). Was designed for batch distillation liquid-phase operation in multi-tank based on steam recompression. In this operation, the top steam is compressed to a higher pressure by the compressor, which is condensed at the reboiler of the tower, and the latent heat is released to the reboiling of the feedstock of the tower, so as to realize the reutilization of the heat at low temperature at the top of the tower. According to the operation mode of compressor, VRCMVBD can be divided into fixed speed VRCMVBD and variable speed VRCMVBD.. An example of ethanol / isopropanol separation shows that VRCMVBD can accomplish the precision distillation separation task and greatly reduce the operating energy consumption and separation cost. Moreover, the variable speed VRCMVBD is superior to the constant speed VRCMVBD.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TQ028.31
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