Economic feasibility of a novel energy efficient middle vessel batch distillation to reduce energy use
Economic feasibility of a novel energy efficient middle vessel batch distillation to reduce energy use
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DOI：
10.1016/j.energy.2012.07.035
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发表时间：
2012-09
期刊：
影响因子：
9
通讯作者：
G. U. B. Babu;R. Aditya;A. Jana
中科院分区：
文献类型：
--
作者：
G. U. B. Babu;R. Aditya;A. Jana
人们早就认识到，与连续流动蒸馏相比，间歇蒸馏的高度不可逆操作会造成更多的能量浪费。为了提高其能源效率，发明了中容器间歇蒸馏（MVBD）塔。在本文中，开发了用于分离三元烃系统的 MVBD 过程的严格模型来模拟其瞬态行为。为了获得最高纯度的产品，我们为代表性配置设计了两种操作策略。这项贡献在 MVBD 中引入了热泵系统，旨在进一步提高其能源和经济潜力。这种新颖的热集成技术采用变速压缩机进行操作，用于在将塔顶蒸气与再沸器液体热耦合之前对塔顶蒸气加压。有趣的是，除了压缩比 (CR) 之外，另外两个操纵变量是塔顶蒸气流入压缩机的流入速率以及向再沸器提供补充热量的外部介质（此处为蒸汽）的流入速率。这种自适应热泵辅助塔的运行最初涉及在整个批处理过程中同时调整两个变量。仿真结果表明，热集成 MVBD 方案预计可以节省成本，同时大幅降低能耗。
It has long been recognized that the highly irreversible operation of batch distillation involves more wastage of energy compared to continuous flow distillation. For boosting its energy efficiency, the middle vessel batch distillation (MVBD) column has been invented. In this paper, a rigorous model for an MVBD process for the separation of a ternary hydrocarbon system is developed to simulate its transient behavior. In order to obtain the products at their maximum achievable purities, we device the two operating policies for the representative configuration. This contribution introduces a heat pumping system in the MVBD aiming to further improve its energetic and economic potentials. This novel heat integration technique is operated with a variable speed compressor for pressurizing the overhead vapor before thermally coupling it with the reboiler liquid. Interestingly, along with the compression ratio (CR), the other two manipulated variables are the inflow rate of overhead vapor to the compressor and that of an external medium (here, steam) that provides makeup heat to the reboiler. The operation of this adaptive heat pump assisted column originally involves the simultaneous adaptation of two variables throughout the entire batch processing. The simulation results show that a cost savings predicted in the heat integrated MVBD scheme can be achieved along with a substantial reduction in energy consumption.