In process industry the total site integration of enterprise such as large chemical and petrochemical industry enterprise can be divided into three parts, process, heat exchanger network and utility system. The steam system is the most important part of the utility system, and its energy consumption account for a large part of the whole energy consumption of the enterprise. Also the safe and stable operation of the steam system is the basis of the safe operation of enterprise. In recent years, the research of steam scheduling is focused on the scheduling optimization in stable operation condition, but rarely related to the scheduling in variable operation condition. In actual production, when the operation condition changes especially abnormal event such as equipment breakdown occurs, the scheduling is based on the operating experience. That kind of method can not give precise scheduling program, and often brings more regulation time and energy consumption. So researching the scheduling in variable operation condition especially when abnormal event occurs have great significance to energy saving and safety and stability of production. After concluded the previous research of steam scheduling, this thesis focus on scheduling in variable operation condition. Through in-depth study of features of the steam system and process, this thesis establishes the models of steam equipments and process equipments, brings an scheduling method which uses scheduling rules and the priorities of regulation equipments. Based on the method, this thesis designs the steam scheduling system. On this basis, this thesis researches the scheduling rules and regulation equipments’ priorities of a coal chemical enterprise, and gives examples of scheduling for two abnormal events. This thesis has the following main contributions: Divides the steam equipments into two types, common equipments and process equipments, and describes the roles and descriptions of the two types in scheduling. Brings a prediction model of consumption of steam, which establishs the the relationship between process load and the consumption or outputs of steam for process equipments. Describes the method of all operation condition scheduling. After analyzes the characteristics of the steam system of process industry and the obstructions of all operation condition scheduling, the chapter brings an scheduling method which uses scheduling rules and the priorities of regulation equipments. Designs the the steam...
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