共查询到17条相似文献,搜索用时 78 毫秒
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Purification of lactic acid by reactive distillation (RD) is a novel technology which has many excellent characteristics compared with traditional technologies. This paper presented a non-equilibrium model for lactic acid purification RD pilot column. An Improved Separation Efficiency Function (ISEF) was proposed based on de-coupling and pseudo-homogenous assumptions, which greatly improved the solving efficiency and made this model suitable for practical application. Simulation results were consistent with the experiments in different conditions, and the simulation results outperformed the simulator ASPEN PLUS in which the equilibrium stage assumptions were adopted. The static characteristics of the pilot setup were also investigated. The analysis result could help to accelerate the commercialization of the lactic acid purification RD technology. 相似文献
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对催化精馏过程模拟的平衡级模型、非平衡级模型和非平衡池模型3个常用的稳态模型及其求解方法进行了综述,并简要分析了各模型和求解方法的优缺点,讨论了催化精馏过程模拟的稳态模型及其求解方法未来的发展方向。 相似文献
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低浓度丙烯和苯催化精馏合成异丙苯过程非平衡级模拟 总被引:4,自引:0,他引:4
对苯与低浓度丙烯合成异丙苯的催化精馏过程建立非平衡级模型。针对模拟过程难以收敛的特点,在计算的开始阶段引入了模式搜索法(Hook-Jeeves method)求解。通过对变量的取值范围进行一定的约束,可比牛顿型法适用较宽的初值范围。计算中根据所用催化精馏塔的特点,对方程进行了一定程度的简化。得到了催化精馏塔内的温度及液相组成分布。模拟结果与试验数据吻合较好,可以为工艺设计提供参考。 相似文献
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引 言近年来 ,在传统催化精馏的基础上提出了一种悬浮床催化精馏的新技术[1,2 ] .悬浮床催化精馏不仅继承了传统催化精馏具有的节省投资、提高反应转化率和选择性、操作条件易控制等优点 ,而且克服了催化剂元件的预制、装卸、更换比较麻烦的缺点 .因此 ,悬浮床催化精馏被认为是一种具有研究价值和应用前景的新技术 ,将其应用于负载杂多酸催化的苯与十二烯的烷基化反应已经过小试验证[2 ] .目前 ,催化精馏的模拟研究大都采用非平衡级数学模型[3~ 5] .因为平衡级模型与工业实际精馏塔的运行结果常常不甚相符 ,已经不能准确模拟催化精馏因反… 相似文献
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精馏过程实时动态模型 总被引:2,自引:0,他引:2
根据工业装置的实际控制要求,提出了一种新的精馏过程实时动态模型。与传统模型相比,该模型在计算速度及畏度方面作了一些改进。引入定容内蒸,逐板进行汽液平衡及水力学计算。基于该模型的软件能非常逼真地实时再现式业装置的正常及异常操作状况,为灵敏板选择及高级控制系统的开发设计提供了依据。 相似文献
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采用改进的分方法建立了多元精馏简化动态模型,提出了借助稳态特进行分块原则,讨论了旨在提高简化模型精度的一些策略。该模型可用于在线优化与控制的研究。 相似文献
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一种改进的多元精馏塔动态模型 总被引:3,自引:0,他引:3
综合了精馏塔的物料及能量平衡、塔板水力学方程、塔板效率及再沸器动态特性,给出一种改进的非理想多元物系精馏塔通用动态数学模型.增加了汽液平衡计算,从而弥补了文献[1]所提出的动态模型的缺陷,提高了其精度和通用性.模型仿真算法采用Gear积分方法,稳定性好,对解刚性比很高的精馏塔微分方程组十分有效.通过对某丙烯腈萃取精馏塔的仿真表明,该动态模型能够较好地反映对象的动态形为. 相似文献
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A new dynamic non-equilibrium mixing-pool model for simulating start-up and dynamic re-sponse of a distillation column is reported.The proposed model is established on the basis ofconsidering the two dimensional flow/mixing behavior of actual trays in a distillation column.Com-parison is made among the computed results of the start-up time and the dynamic response time bythe proposed and five other typical models.It is found that the computed time for both dynamicprocesses is longer by the model which considers any flow/mixing pattern than by the model withoutsuch concern.The inertia effect of flow/mixing seems to be important and can not be ignored inmodeling the transient process of distillation.The proposed model,which is believed to be suitableto large column,seems somewhat useful in predicting industrial distillation dynamics. 相似文献
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In this work, a dynamic model was developed to simulate the transient behaviour of a pilot scale, continuous, siagewise, 15 plate distillation column separating a mixture of ethanol, iso-propanol and isobutanol. The accuracy of the predictions was assessed by transient response data collected during experiments under step changes in reflux ratio, feed flow rate and feed composition.
Results demonstrated the feasibility of simulating multicomponent distillation under unsteady state conditions with fairly good success. Further improvements were suggested for a better accuracy 相似文献
Results demonstrated the feasibility of simulating multicomponent distillation under unsteady state conditions with fairly good success. Further improvements were suggested for a better accuracy 相似文献
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描述多组份精馏塔要用众多的方程式,数字仿真是求得它的动态响应的有效方法,如果有J个组份,不是理论板,非恒分子流,在一块加料板上有气、液混合进料,并假设回流R及再沸器供热量Q_B恒定,在这样的条件下本文编排了仿真程序,仿真结果与文献[1]提供的数据一致,稍加更动后也可仿真其他情况。 相似文献
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提出一个新的计算非理想多元元精馏物系Murphree点效率的方法,在计算塔板上鼓泡液体中汽液两相间的传质通量时,充分考虑了在扩散路径上混合物组成的变化所产生的影响,同时根据多相湍流动力学的原理计算了鼓泡液体中汽、液相的接触面积.利用这个新模型对6个多元非理想混合物的计算,表明它能够准确地预测某些组元点效率的奇异性,而且预测的精度明显地优于现有其他方法,证明它是一个有效的、可靠的非理想多元精馏点效率预测方法. 相似文献
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根据多项式正交配置原理,系统地给出了一种通用的精馏塔简化动态模型.其建模基本原理是将精馏塔的状态变量考虑成塔的轴向距离的连续可微函数,并用多项式近似描述,使得逐板机理模型大为简化,在简化动态模型中,综合考虑了物料及能量平衡、塔板水力学及再沸器动态特性,避免了汽液平衡的迭代计算,节省了计算时间.通过对脱乙烷精馏塔进行仿真,证明了该简化模型可以给出满意的计算精度. 相似文献