轻汽油醚化工艺的对比分析及优化

发布时间：2019-02-15 09:55

【摘要】：本论文介绍了用于改善汽油质量的轻汽油醚化工艺,通过三套采用国内外轻汽油醚化技术并已经投产的装置,从技术使用费、装置投资、催化剂装填量、装置运行结果、装置公用工程消耗和综合能耗六个方面进行对比分析,阐述了自主醚化技术的优势,为炼化企业的技术升级提供新的选择。使用Aspen Plus对采用LNE技术的轻汽油醚化装置进行模拟,模拟数据参考工艺包数据和现场标定数据,通过模拟,为各个单元操作确定了合适的单元模型和热力学方法。依靠模拟的流程,对反应精馏塔、萃取塔和甲醇回收塔的参数进行灵敏度分析,将最佳进料位置、塔板数、进料温度、回流比和塔顶采出率作为分析的参数,在综合考虑产品质量和能耗的基础上,确定各个装置的最优操作参数。对轻汽油醚化装置的用能情况进行了三环节分析,计算得到装置的能量转换效率为81.78%,工艺利用环节效率为93.93%,能量回收率为48.17%,工艺总用能E_N=1183.62MJ/t原料,通过分析装置的用能情况,提出了提升装置用能效率的改进方法。用夹点分析的方法对装置进行换热网络优化,制定了38套优化方案,通过对比总花销占原总花销的比例以及换热面积的减少量,确定采用6号优化方案和27号优化方案进行设计和校核,6号优化方案和27号优化方案每年可分别节省公用工程26.92万元和28.43万元,所以27号优化方案更有优势。重新设计了27号方案中换热器的实际大小及结构参数,发现可节约53.76万元的设备投资费用,从经济性上验证了换热网络优化的重要性。
[Abstract]:In this paper, the light gasoline etherification process used to improve gasoline quality is introduced. Through three sets of equipments which have been put into production and adopted the domestic and foreign light gasoline etherification technology, from the technical usage rate, the unit investment, the catalyst loading quantity, the unit operation result, the paper introduces the light gasoline etherification process. This paper compares and analyzes six aspects of utility consumption and comprehensive energy consumption, expounds the advantages of etherification technology, and provides a new choice for technical upgrading of refinery and chemical enterprises. Aspen Plus is used to simulate the light gasoline etherification device using LNE technology. The simulation data refer to the process package data and the field calibration data. Through the simulation, the appropriate unit model and thermodynamic method are determined for each unit operation. The parameters of reaction distillation column, extraction column and methanol recovery column were analyzed by the simulated process. The optimum feed position, tray number, feed temperature, reflux ratio and recovery rate of the top of the column were taken as the parameters of the analysis. On the basis of considering product quality and energy consumption, the optimal operating parameters of each device are determined. The energy consumption of light gasoline etherification unit is analyzed in three links. The energy conversion efficiency of the device is 81.78, the process utilization efficiency is 93.93, and the energy recovery rate is 48.17. Based on the analysis of the energy use of the process total energy using E_N=1183.62MJ/t, the improvement method of the energy use efficiency of the lifting unit is put forward. The heat transfer network was optimized by means of pinch analysis, and 38 sets of optimization schemes were established. By comparing the proportion of total expenditure to the original total expenditure and the reduction of heat transfer area, It is determined that the 6 and 27 optimization schemes are adopted for design and verification. The 6 and 27 optimization schemes can save 269200 yuan and 284300 yuan of public works each year, respectively, so the 27 optimization scheme has more advantages. The actual size and structure parameters of heat exchanger in scheme 27 are redesigned, and it is found that the investment cost of equipment can be saved by 537600 yuan, which proves the importance of optimization of heat exchanger network from the economic point of view.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE626.21

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