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常减压装置是炼油能耗大户,其用能水平的高低对炼油厂综合能耗有较大影响。而在完成装置核心工艺的用能优化基础上再进行换热网络优化,是常减压装置的节能重点。应用AspenPlus流程模拟软件,建立某炼油厂常减压装置及换热网络流程模拟模型,并应用热集成技术及夹点技术对装置进行用能分析,对常减压及换热网络进行热集成优化,提出操作优化方案和改造优化方案,提高常减压装置的用能水平和热回收水平。操作优化实施后,装置每年产生的实际经济效益为476.5万元。另结合夹点技术对换热网络进行了三个层面的分析,首先应用夹点技术绘制过程负荷性能图,查看换热网络有无违背夹点换热原则;然后查找有无交叉换热的换热器;最后对可利用的低温余热进行有效利用。提出了相应的改造优化方案,改造方案实施后,预计每年为企业节省400万元的操作成本。
Atmospheric and vacuum unit is a large oil refining, the level of its use of energy consumption of the refinery have a greater impact on energy consumption. And in the completion of the device core technology to optimize the use of energy based on the heat exchanger network optimization, atmospheric and vacuum devices is the focus of energy conservation. AspenPlus flow simulation software was used to set up a simulation model of the atmospheric and vacuum distillation unit and heat exchange network flow in a refinery. Thermal integration technology and pinch point technology were used to analyze the energy consumption of the unit, , Put forward the operation optimization plan and the transformation and optimization plan to improve the atmospheric and vacuum distillation unit energy consumption level and heat recovery level. After the operation is optimized and implemented, the actual economic benefits generated by the device are 4.7665 million yuan each year. In combination with the pinch point technology, the heat exchange network is analyzed in three aspects. First, the pinch point technique is used to draw the process load performance diagram to see if the heat exchange network has a violation of the pinch point heat exchange principle; and then to find out whether the cross heat exchange Finally, the effective use of low temperature waste heat available. Put forward the appropriate transformation and optimization program, after the implementation of the transformation program is expected to save 4 million yuan per year operating costs.