低温精馏过程模拟及其分离特性分析(Ⅱ)带有侧线返回进料的低温精馏塔模拟

应用严格的热力学模型研究了带有侧线返回进料的氢同位素低温精馏塔的分离特性.根据氢同位素低温精馏体系的特点，以平衡级模型为基础建立了氢同位素低温精馏稳态模拟模型，确定了模型方程适宜的求解方法.塔的一股侧线出料流股经过一个平衡反应器完成平衡反应后，作为内部进料流股，与原外部进料混合后重新进入精馏塔内进行分离操作.通过对带有侧线返回进料的塔的计算模拟阐明了这一侧线流股对塔分离特性的影响.在平衡反应器内，HD部分分解为H₂和D₂，塔顶产品中H₂的浓度增加了8.635%，塔底D₂的浓度增加了11.327%.

SIMULATION AND CHARACTERISTIC ANALYSIS OF CRYOGENIC DISTILLATION PROCESS(Ⅱ) SIMULATION OF CRYOGENIC DISTILLATION COLUMN WITH FEEDBACK STREAM

A rigorous thermodynamic model was used to study the characteristics of cryogenic distillation column of hydrogen isotope system having feedback stream. The steady state behavior was studied establishing a fundamentally sound model that is capable of accurately describing the separation process. The numerical algorithm which can provide better stability,accuracy and efficiency in computing time was developed to solve complex cryogenic distillation problems. A side stream was sent to an equilibrator as an internal feed stream and then mixed with the external feed stream of the column. The simulation results indicated the effects on the characteristics of cryogenic distillation column. The feedback stream was partly decomposed at the equilibrator into H 2 and D 2. Mole fraction of H 2 in the top product increased by 8 635%, and mole fraction of D 2 in the bottom product increased by 11 327%.