【作者】 赵雄；

【导师】 袁希钢；

【作者基本信息】 天津大学 ， 化学工程， 2008， 硕士

【摘要】 本文介绍了一种新型高效的精馏节能技术—内部能量耦合精馏技术。应用化工流程模拟软件ASPEN PLUS和面向对象编程语言VB6.0对内部能量耦合精馏塔进行模拟研究。以苯-甲苯和丙烯-丙烷物系为例,模拟分析内部能量耦合精馏塔(HIDiC)的特性及其节能效果,将模拟结果与传统精馏塔(CDIC)及热泵精馏塔(VRC)进行比较。结果显示,内部能量耦合精馏塔的温度、流率和浓度分布都与传统精馏塔存在较大的差别。对苯-甲苯物系,热泵精馏塔的节能效果最好,节能百分率可达40%。对丙烯-丙烷物系,理想内部能量耦合精馏塔的节能优势明显,节能百分率在60%~80%。鉴于换热量平均分布方式在现实中难以实现,本文提出了更合理的热温匹配方式,分析了压缩比、进料热状态及换热量分布方式对内部能量耦合精馏塔特性和节能效果的影响。压缩比和进料热状态对内部能量耦合精馏塔特性和节能效果的影响作用显著。压缩比越小,节能效果越好,但压缩比的下限为最小压缩比,否则会产生逆向传热。内部能量耦合精馏塔的节能效果随进料热状态的增加而增大。两种换热量分布方式的节能效果基本一致,而热温匹配方式可以在压缩比较小时大幅度减小传热面积。将内部能量耦合精馏塔应用于分离多组元物系,得出与二组元物系基本一致的结论,表明内部能量耦合精馏塔同样适用于多组元物系的分离,只要物系的相对挥发度足够小,内部能量耦合精馏塔就可以显示出良好的节能效果。更多还原

【Abstract】 As a new and energy-efficient distillation technology, internally heat-integrated distillation column (HIDiC) is studied by means of simulation in this paper. The simulation is performed with commercial software ASPEN PLUS and object-oriented programming language VB6.0. The mixture of benzene-toluene and that of propylene-propane systems are taken as the base cases in the simulations of the characteristics and the energy-saving effect of HIDiC,then the results are compared with those of conventional distillation column (CDIC) and heat-pump distillation column (VRC). The results show that the distributions of temperature, flow rate and composition of HIDiC are different from those of CDIC. For benzene-toluene system, the energy-saving performance of VRC, with the value of 40% compared with the CDIC, is the best and in the case of propylene-propane system,the HIDiC provides the best energy-saving performance of 60%~80%.Since the mode of averaged heat duty (AH) distribution is difficult to achieve in reality, a more reasonable heat duty distribution mode called temperature and heat duty matching (THM) is proposed. The influence of compression ratio, feed thermal condition and distribution mode of heat duty on the characteristics and energy-saving performance of HIDiC was analyzed. It is found that the characteristics and energy-saving performance of HIDiC were influenced significantly by compression ratio and feed thermal condition. The energy-saving performance increases with the decrease of the compression ratio, and the compression ratio is however lower bounded by a limit value beyond which the temperature difference between the rectifying section and the striping section will become negative and a reverse heat-transfer will happen. The energy-saving effect of HIDiC increases with the increasing of vapor ratio in the feed (feed thermal condition). In applying THM,the energy-saving effect is nearly the same as AH, but THM can reduce heat transfer area significantly when the compression ratio is small enough.In the case of separation of multi-component mixture in HIDiC, we get the same trends with the binary systems. It is concluded in general that HIDiC favors the separation of mixtures with smaller relative volatility.更多还原