Vapor-liquid equilibrium of coal liquefied oil fractions under high temperature and high pressure
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摘要: 煤液化过程中，反应单元和分离单元是整个液化体系的核心部分，反应器和分离器中各组分在气、液相中的平衡组成确定不仅决定设备的尺寸设计，而且对液化过程中供氢溶剂的选择和反应条件的优化起到关键作用。但由于煤液化油在高温高压下的气、液平衡数据不足，使得反应器内的组成分布无法预测，相关的反应器设计过程仅能凭经验进行。为得到反应条件下的气液平衡数据，研究引入流程模拟软件Aspen Plus，将煤液化油蒸馏得到的窄馏分段与各种气体组分（如H2、C2H6等）共同建立了煤液化油闪蒸过程，得到了高温高压下煤液化油气液平衡体系。利用闪蒸体系计算得到在给定温度、压力情况下，各组分在高温、低温分离器内的气、液两相分布情况，通过改变高温分离器的温度和压力，分析了高温分离器内相平衡常数随温度（623.15K~723.15K）、压力（10MPa~21MPa）变化的规律。为进一步归纳适用于煤液化油的气液平衡方程，以高温分离器数据为基础，对推导建立的高压下烃类相平衡方程中的参数进行回归，得到高温高压下，适用于神华煤液化油并具有物理意义的二元（T，p）气液相平衡常数方程。
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关键词:
- 煤液化油 /
- 气液平衡常数 /
- Aspen Plus
Abstract: In order to get the vapor-liquid equilibrium constants under the real liquefaction conditions, the data from the fractions of coal liquefied distillation oil and different gas, such as H2 and C2H6, were combined together to establish the coal liquefied oil flash distillation system through the process simulation software Aspen Plus. By using the flash-distillation system, the vapor-liquid equilibrium composition and distribution were calculated at reaction temperature and pressure. Also the rules of equilibrium constant vary with the temperature (623.15K~723.15K) and pressure (10MPa~21MPa) were explored. Furthermore, the parameters of deducing hydrocarbon equilibrium equation at high pressure were regressed. And the two variable vapor-liquid equilibrium equation specified for the Shenhua coal liquefied oil was established. -
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