Optimization Design Of Sintering Waste Heat Power Generation System Based On Superstructure MINLP Model And Genetic Algorithm

As one of the pillar industries of national economy the development of iron and steel industry in our country lead to the development of national economy, also it makes the total energy consumption bigger. In iron and steel industry, the sintering energy consumption is second only to iron-making process. From the perspective of energy cascade utilization efficiency and economy analysis, sintering waste heat power generation is the most effective way to sintering waste heat recovery and utilization. Therefore, optimization design of the sintering power systems, so as to realize the integration of waste heat power station equipment innovation and technology, maximize the recovery of waste heat from low temperature and power, which can not only achieve energy saving target, the production cost for iron and steel enterprise can also be further reduced, so that it has important academic value and practical significance.In the optimization design of sintering waste heat power generation system, there are lots of choices on the system arrangement and thermal paramaters, at the same time by actual constraint conditions such as the quality of flue gas, dew point temperature, and the heat exchanger heating surface of steel consumption efficiency, the engineering design units would face the problem on how to achieve the optimal energy distribution, and how to realize the maximization of the interests of resource recovery of waste heat from complex decision balance. From the general level, in the energy power system, composite integration system consists of a number of different processes, each process is made up of multiple specific parts; its models are mostly by the linear and nonlinear equation. In thish paper, the superstructure MINLP method of the chemical process system is used in energy power system, the superstructure model is built aimed at the structural feature of each subsystem respectively, and achieves a general mathematical description of energy power system structure, then based on the principle of energy cascade utilization and generatic algorithm, the optimization design problem of sintering waste heat power generation system is studied, the main research are as-follows:Firstly, according to the principle of energy cascade utilization, on the basis of the pinch technology, we discuss the global energy optimization theory of sintering waste heat recovery system, aim at the process of sintering waste heat power generation system, explain how to carry out energy material balance calculation, choice of logistics, data extraction are explained. From the perspective of global optimization, by comparing the system under different conditions of energy recovery situation, develop a graphical and visual analysis of he global energy system optimization theory. Through the graphical visualization analysis, the bottleneck of waste heat recovery could be reflected intuitively, so that more targeted optimization improvement measures are put forward and the optimization adjustment method system of waste heat utilization are also obtained.Secondly, based on the graphical analysis, combined with the superstructure MINLP method in chemical process system, the superstructure MINLP method is proposed for unified mathematical modeling in energy power system, and the superstructure mathematical model for sintering waste heat power generation system is established, which made the complicated topology structure of waste heat power generation system is easy to model, the operating parameters influenced and restricted each other in the subsystems are also easy to described.Then, based on the superstructure MINLP mathematical model, by adopting genetic algorithm, the sintering waste heat power generation system would be analyzed. Through coding, building constraint conditions, calculating the fitness and genetic optimization iteration of the design scheme, the maximum heat recovery efficiency target optimization design of the sintering machine, ring cold machine, the structure and parameters of heat recovery steam generator and steam turbine are realized.Finally, combined with the exergy analysis method, by analyzing the exergy loss, exergy-economy analysis and exergy loss environmental benefits of the iron and steel enterprises of sintering waste heat power generation system, provide a theoretical basis for comprehensive and scientific assessment of the sintering waste heat power generation system.