热耦蒸馏技术进展

热耦蒸馏作为一种新型蒸馏技术 ,与常规蒸馏相比 ,热耦蒸馏平均可节省能耗 30 %左右 ,同时还可降低设备投资。本文介绍热耦蒸馏塔的构造、分类、特点以及设计和应用。

热耦蒸馏的热力学分析

从热力学上分析了热耦蒸馏的节能原理,比较了有效能损失和热力学效率,并对液化天然气混合物的分离分别按热耦蒸馏和常规蒸馏方案进行了严格模拟,结果表明,热耦蒸馏塔比常规蒸馏方案节能约21%,热力学效率也从常规方案的7 7%提高到11 8%.

液化天然气分离的热耦蒸馏工艺

采用严格计算法,模拟研究了液化天然气分离的一个实例,并把现有常规蒸馏工艺改用热耦蒸馏工艺,即petlyuk塔或侧线提馏塔。结果表明,改进的工艺都有比较好的节能效果:petlyuk塔比现有常规蒸馏方案节能21%,侧线提馏塔也可达到节能14.8%。二者都有较好的应用前景。

液化天然气分离的节能蒸馏工艺

采用严格模拟计算的方法,对液化天然气分离过程的现有常规蒸馏工艺与热耦蒸馏工艺、侧线提馏工艺、双效蒸馏工艺和热集成工艺进行了模拟,并比较了其能量消耗。模拟计算结果显示,复杂蒸馏工艺都比常规蒸馏工艺减少了能耗和操作成本。其中,热耦蒸馏工艺可比常规蒸馏工艺节能21.4%,侧线提馏工艺节约13.3%,双效蒸馏工艺可节约34.7%,热集成工艺节约则达37.6%左右,表明新工艺在此分离过程中都有较好的应用前景,尤以多效蒸馏和热耦蒸馏最有优势。

Simulation and Optimization for Thermally Coupled Distillation Using Artificial Neural Network and Genetic Algorithm

In this paper, a new approach using artificial neural network and genetic algorithm for the optimization of the thermally coupled distillation is presented. Mathematical model can be constructed with artificial neural network based on the simulation results with ASPEN PLUS. Modified genetic algorithm was used to optimize the model. With the proposed model and optimization arithmetic, mathematical model can be calculated, decision variables and target value can be reached automatically and quickly. A practical example is used to demonstrate the algorithm.