LNG冷能用于催化重整装置的研究

以某炼油厂2.3 Mt/a催化重整装置为研究对象,利用HYSYS软件对现有催化重整工艺进行了模拟。针对原装置存在流程复杂、电能消耗大等缺点,考虑通过将LNG冷能用于催化重整装置以实现对原流程的改进,在对塔参数进行优化的基础上,利用夹点技术对改进流程进行了换热网络优化,使得公用工程用量最小。最后,对LNG参与的换热过程进行火用分析及能级分析,以保证温位匹配的合理性。改进后的流程省去了压缩再接触部分,电负荷可降低了11.027 MW,氢气分离压力由2.65 MPa降低为0.34 MPa,氢气摩尔分数由94%提高到98%,回收能量18.967 MW,减小了冷热公用工程用量。通过对LNG冷能利用进行各换热装置和整体换热流程的火用分析和能级分析后对其使用效果进行评价,表明LNG冷能利用合理。

Study on utilization of LNG cold energy for catalytic reforming unit

Based upon the operation of a refinery with a capacity of 2.3 million tons/year,the existing catalytic reforming process is simulated by using HYSYS process simulation software.Considering the shortcomings of the original process,such as complicated process and higher power consumption,LNG cold energy can be utilized in the catalytic reforming unit to improve the original process.Secondly,based on the optimization of the tower parameters in the improved process,the heat exchange train is optimized by pinch technology to minimize utility requirement.Finally,the heat transfer process of LNG is analyzed based on the exergy efficiency and energy-level differences to ensure the reasonability of temperature matching.In the improved process,the compression recontact process is eliminated,11.027 MW power consumption is saved,the hydrogen separation pressure is reduced from2.65 MPa to 0.34 MPa,and the molar purity of hydrogen is increased from 94％ to 98％.18 967 kW energy is recovered,and cold and hot utilities requirements are reduced.Therefore,it is economically feasible to utilize LNG cold energy in the refinery catalytic reforming units.