蒸汽动力系统(火用)经济成本分摊及运行优化

摘要

The target of steam power system in petrochemical plant is to provide steam and power for the processes,and the cost calculation or allocation for the steam and power system are the focus of attention in industry and academia all the time.The mathematical models based on exergoeconomic principles were formulated to calculate the exergy cost of steam and power,which were composed of mass balance equations,energy balance equations,exergy balance equations,exergy cost balance equation and supplement cost equations of all equipment and/or subsystem.The unit costs of steam and power electricity of an industrial steam power system were calculated and discussed using the presented models.In addition,the optimal operational planning scheme was selected from different candidate operation scheme under the objective of total exergy cost.The results are helpful to the operational planning optimization,diagnosis and retrofit decision making of industrial steam power.%石化企业蒸汽动力系统的任务是为工艺提供蒸汽和动力,蒸汽动力系统的汽电成本计算或分摊一直是工业界和学术界关注的焦点问题.文中基于(火用)经济学原理,通过建立设备及系统的质量平衡、能量平衡、(火用)平衡及(火用)经济平衡、成本补充方程,对某石化企业蒸汽动力系统进行了成本计算,得出了蒸汽动力系统各(火用)流成本,给出了确定汽电需求下的总(火用)成本并进行了分析,并以总(火用)成本为目标,对运行方案进行了优选.所得结果对于对决策人员实施运行优化及系统更新改进具有一定的指导意义.