【作者】 高翔；

【导师】 黄克谨；

【作者基本信息】 北京化工大学 ， 控制科学与工程， 2011， 硕士

【摘要】 近代以来,能源问题一直受到全世界各国的关注,尤其是经历过两次石油危机之后,各国都高度重视起了能源问题。能源问题在化学工业尤为突出,化工业是能源密集型工业,工业过程中能耗较大,尤其是分离过程。相比传统精馏塔,热耦合技术具有能耗小、成本低的优点。因此,如何将热耦合技术的优点发挥到最大化,成了现阶段国内外研究热点,也是本文的研究依据。本文讨论的热耦合技术主要是内部热耦合、外部热耦合两种。内部热耦合是在同一个塔的高压塔段和低压塔段间进行,低压塔段的上升蒸汽需要被压缩以提高压力,保证传热温差,因此内部热耦合是要用蒸汽再压缩机提高压力。而外部热耦合则是在两个不同操作压力的精馏塔之间进行。常规的反应精馏塔,精馏段的产物需要使用冷凝器进行冷凝,而提馏段产物需要使用再沸器使之汽化,此操作过程使得常规精馏塔的耗能高、热力学效应低。内部热耦合反应精馏塔(简称IHIRDC)是将原来反应塔的反应段塔板数平均分为高压塔段和低压塔段进行热传递。外部热耦合原理是提高精馏塔压力,使高压塔塔顶冷凝器的温度高于低压塔塔底再沸器的温度,从而进行热量传递,使高压塔塔顶冷凝放出的能量回收。外部热耦合又分为精馏段/提馏段热耦合和冷凝器/再沸器热耦合。本文通过对理想四元反应精馏体系A+B(?)C+D的常规反应精馏、内部热耦合和外部热耦合分别进行研究,以年总费用TAC为目标函数,从而比较总结,得出一种最优的结构。更多还原

【Abstract】 In modern times, the problem of energy resources has always been focused by all countries in the world, especially after the two crises of petroleum. Every country is paying high attention to the problem of energy resources. The problem is more obvious in the chemical industry as the chemical industry is energy intensive industries and the energy consumption is very huge, especially in separation process. Compared with traditional distillation column, heat integration technology shows the advantages of less energy consumption and low capital investment. Hence, how to maximize the advantages of heat integration of the reactive distillation column has become the hot point home and abroad nowadays and it is also the research theoretical basis of this paper.This paper mainly discusses two kinds of heat integration, the internal heat integration and the external heat integration. The internal heat integration is realized between the rectifying section and the stripping section of a single distillation column. In order to keep the temperature difference between the stripping section and the rectifying section, the ascending vapor flow from the stripping section is sent into the compressor to increase the pressure. Compared with the internal heat integration, the external heat integration is operated between two individual distillation columns with different operating pressures.In the traditional reactive distillation column, the product from the top of the distillation column needs to be condensed in the condenser and the product from the bottom needs to be vaporized by reboiler. In this case, the traditional reactive distillation column shows the disadvantage of high energy consumption and low thermodynamic effect. In the internal heat-integrated reactive distillation column (IHIRDC), the reaction zone is divided into a high pressure section and a low pressure section to achieve the heat transfer. The basic theory of external heat integration is to increase the pressure of reactive column. On that situation, the temperature of the condenser in the top of the high pressure column will be higher than that of the low pressure column. The temperature difference makes the heat transfer possible and the energy from the condenser in the top of high pressure column can be recycled. Also external heat integration includes rectifying section/stripping section heat integration and condenser/reboiler heat integration.In this paper, the reactive distillation system including an ideal reactive distillation column separating a hypothetical reaction, A+B(?)C +D, is employed to study and compare the following three systems:the conventional reactive distillation system, the reactive distillation system with internal heat integration and the reactive distillation system with external heat integration. Finally an optimum reactive distillation system in obtained based on the goal function of total annual costs (TAC).更多还原