Operation optimization is an effective method to explore potential economic benefits for existing plants. The m.aximum potential benefit from operationoptimization is determined by the distances between current operat...Operation optimization is an effective method to explore potential economic benefits for existing plants. The m.aximum potential benefit from operationoptimization is determined by the distances between current operating point and process constraints, which is related to the margins of design variables. Because of various ciisturbances in chemical processes, some distances must be reserved for fluctuations of process variables and the optimum operating point is not on some process constraints. Thus the benefit of steady-state optimization can not be fully achied（ed while that of dynamic optimization can be really achieved. In this study, the steady-state optimizationand dynamic optimization are used, and the potential benefit-is divided into achievable benefit for profit and unachievable benefit for control. The fluid catalytic cracking unit （FCCU） is used for case study. With the analysis on how the margins of design variables influence the economic benefit and control performance, the bottlenecks of process design are found and appropriate control structure can be selected.展开更多
文摘该文分析了火电机组脱硫系统主要能耗设备的能耗特性,建立脱硫设备能耗与机组负荷、燃煤硫分和脱硫率的数学关系,在此基础上提出电站脱硫系统的节能优化运行方法,并结合典型1 000 MW火电机组脱硫系统开展案例分析与定量计算。结果表明:新型优化运行方法不增加新设备、不影响机组安全稳定运行,在40%~100%锅炉最大连续蒸发量(boiler maximum continue rate,BMCR)负荷工况下,仅通过运行方式的调整即可在确保脱硫效果的前提下使烟气脱硫(flue gas desulfurization,FGD)系统电耗下降约2%~22%,其中大部分负荷下电耗下降均可达10%以上;而按典型负荷工况估算,年可节约电能5052MW h,相比于原方案总电耗下降10.6%,节约电费176.8万元,节能效果显著。
基金Supported by the National Natural Science Foundation of China(21006127)the National Basic Research Program of China(2012CB720500)the Science Foundation of China University of Petroleum(KYJJ2012-05-28)
文摘Operation optimization is an effective method to explore potential economic benefits for existing plants. The m.aximum potential benefit from operationoptimization is determined by the distances between current operating point and process constraints, which is related to the margins of design variables. Because of various ciisturbances in chemical processes, some distances must be reserved for fluctuations of process variables and the optimum operating point is not on some process constraints. Thus the benefit of steady-state optimization can not be fully achied（ed while that of dynamic optimization can be really achieved. In this study, the steady-state optimizationand dynamic optimization are used, and the potential benefit-is divided into achievable benefit for profit and unachievable benefit for control. The fluid catalytic cracking unit （FCCU） is used for case study. With the analysis on how the margins of design variables influence the economic benefit and control performance, the bottlenecks of process design are found and appropriate control structure can be selected.
