Abstract:

The 2.4×10⁶t/a capacity fixed-bed residuum hydrotreating plant process flow model for specialized process analysis and optimization was established by utilizing the Petro-SIM software and RHDS-SIM suite and was contributed to debottlenecking and making an effort to quality and margin incrementation. The accuracy and reliability of the model were validated, as well as the impacts on hydroprocessing by alternative hydrogen partial pressure and reactor inlet temperature were studied. As the hydrogen partial pressure changed from 12.76MPa to 13.34MPa, the catalysts life remaining of R1, R2 and R3 increased 6 days, 36 days and 33 days, respectively. The total desulfurization, demetalization and concarbon removal rate were enhanced by augment of R1 inlet temperature, while the chemical hydrogen consumption increased from 141.3m³/m3 to 144.7m³/m3. Raising the inlet temperature of R3 from 384℃ to 390℃, sulfur content of the hydro-treated residual reduced from 5514μg/g to 4880μg/g. The effect of decreasing MP steam consumption of the stripper on utility cost was also simulated. The results suggested that, when the flow rate of MP steam was lowered by 0.4t/h, a margin of about 1372000CNY/a could be obtained. Sidedraw flowrate of diesel should be controlled under 23t/h in order to meet the product specifications and downstream unit demands when increasing the diesel yields.

Key words: residuum hydrotreating, process flow modeling, reactor model, process analysis, quality and margin incrementation

摘要：

基于RHDS-SIM反应模块和Petro-SIM模拟软件建立了2.4×10⁶t/a固定床渣油加氢装置的反应器模型和全流程模型，用于深度工艺分析及优化操作条件，解决装置生产瓶颈，提高产品收率和质量，实现降本增效。本文以两种不同反应器入口温度工况下的运行参数和产品性质对模型进行了准确性验证。应用全流程模型分别对改变氢分压和反应器入口温度进行了工艺分析。模拟结果显示，在维持脱硫率不变的前提下，将氢分压从12.76MPa增加至13.34MPa，R1、R2、R3催化剂预测剩余寿命分别增加了6天、36天和33天。将R1入口温度分别提高1℃、3℃、5℃，脱硫率、脱金属率和脱残炭率分别提高了0.78%、3.72%、0.64%，化学氢耗由141.3m³/m3增加至144.7m³/m3。将R3入口温度由384℃提高至390℃，加氢渣油硫含量由5514μg/g下降至4880μg/g。通过实施优化措施，减少汽提塔底中压蒸汽流量0.4t/h，可在满足产品指标的前提下实现节能降耗，提升装置年经济效益约137.2万元；在多产柴油工况下侧线柴油抽出率应控制在23t/h以下，柴油及加氢渣油产品性质能够满足产品规格及下游装置进料要求。

关键词: 渣油加氢, 流程模拟, 反应器模型, 工艺分析, 提质增效