蜡油加氢装置的全流程模拟与变工况氢耗计算

Simulation of a Wax Oil Hydrotreating Unit and Calculations of Hydrogen Consumption at Off-Design Conditions

加氢反应过程及其氢耗是炼厂氢气资源高效、合理利用的关键。为了获得变工况条件下加氢处理过程中氢耗与全流程参数变化的耦合关联,将硫化物、氮化物和芳烃各分为4个集总,采用ASPEN Plus对蜡油加氢工艺全流程进行模拟,采用某炼化企业的蜡油加氢处理装置操作参数与原料产品性质对模拟结果进行验证。在全流程模拟的基础上,对蜡油加氢处理装置在原料硫含量和加工负荷变工况条件下氢耗进行了计算和分析。研究表明:利用反应动力学的全流程模拟所得氢耗随加工负荷的变化趋势与经验关联式所得结果一致,氢耗随原料硫含量的变化较经验关联式更接近实际生产。基于流程模拟的基础数据可以为工艺流程中加氢反应氢耗计算提供更深入的理解。

Hydrogenation reaction and hydrogen consumption are essential for efficient and reasonable utilization of hydrogen in refineries. In order to obtain coupling relationship between hydrogen consump tion and variation of the process parameters at off-design conditions, a wax oil hydrotreating unit was sim- ulated by using ASPEN Plus, in which sulfide, nitrides and aromatics were divided into four lumps. The simulation results were verified by operational parameters and properties of feedstock and products of a practical wax oil hydroteating unit. Based on the simulations, the hydrogen consumption of a wax oil hydrotreating unit at different processing loads and sulfur contents of feed oil was calculated and analyzed. The results show that the trend of hydrogen consumption varying with processing load agrees well with the results obtained by empirical correlations. However, when sulfur content of feed oil increases, hydrogen consumptions obtained by simulations are more close to the practical situations. The fundamental data obtained from simulations will provide a deep understanding of calculations on hydrogen consumption of hydrogenation reaction in refineries.