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Research On Optimal Operation Of Byproduct Gas System In Iron And Steel Enterprises

Posted on:2016-02-19Degree:MasterType:Thesis
Country:ChinaCandidate:Z M ZhaoFull Text:PDF
GTID:2309330461984283Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
Byproduct gas, one of the most important secondary energy, accounts for about 30% of the total energy in iron and steel enterprises. It is of great significance for the enterprises to apply an effective method to accurately predict and scientifically distribute gas resources, so as to reduce energy consumption, to decrease gas emission as well as to improve economic benefits. This article systemically studied not only the mechanism of production and consumption but also the laws of supply and demand of byproduct gas in iron and steel enterprises. Accordingly, both the prediction model and scheduling model of byproduct gas were established. Moreover, the software for optimizing the byproduct gas operation has been developed. All of these efforts have been made to provide theoretical basis and analytical tool for rational use and optimal allocation of byproduct gas in iron and steel enterprises. The research work of the thesis is as follows.Firstly, the basic characteristics of byproduct gas system of iron and steel enterprises were analyzed, which exhibits a brief introduction of the production process of iron and steel enterprises and defines the relationship between the production process and the byproduct gas system. And then, the byproduct gas system was divided into three parts:gas production system, gas consumption system and gas distribution system. Afterwards, the roles of the three parts in gas system were presented.Secondly, based on the analysis of time series and influencing factors, a prediction model of the production and consumption for the byproduct gas system was constructed. According to the production prediction of byproduct gas, gas flow rate and calorific value prediction models were built under the different opration mode. Based on the consumption characteristic of the primary steel production process, a consumption prediction model of byproduct gas was established. By the means of case study, the prediction results of the model has a smaller relative error which could satisfy the requirement of production scheduling.Thirdly, a novel MILP model for multi-period optimization of byproduct gas system in the iron and steel-making process was established. The objective of the model is to minimize the total operating cost of the byproduct gas system, which contains cost of gas emission, fluctuations in holder level and calorific value. What’s more, the constraints are constructed for each type of scheduling unit by considering the gas needs and the process requirements of different users. The validity of the optimization model was verified by referring to the practical gas production data. The results shows that the model can save operating cost dropped by 12.5%.Finally, the design of a software to optimize the operation of byproduct gas system was presented. The software can make it more timely and effectively for managers to distribute the byproduct gas, which was introduced in three aspects:the system design, the function realization and the operation tests.
Keywords/Search Tags:Byproduct gas, Production and consumption prediction, Scheduling optimization
PDF Full Text Request
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