| Achieving the goal of "double carbon" is the inevitable choice to solve the problem of resources and environment and realize the sustainable development.The iron and steel industry plays an important role in the development of national economy.Due to the high energy consumption,high pollution and high emissions,it faces serious environmental problems,so it is highly valued by various countries.Only by exploring and mastering the metabolic behavior laws of material and energy in the steel manufacturing system,analyzing the metabolic mechanism of material and energy and carbon emission characteristics in the production process,and constructing a green and low-carbon model that can be replicated,popularized and effective in the steel manufacturing system,can the resource structure of the steel manufacturing system be optimized and precise energysaving and emission reduction measures be formulated,providing scientific basis for producers and managers in low-carbon production and resource control.The thesis is supported by the National Natural Science Foundation of China "Research on the transient flux regulation and evolution mechanism of the industrial metabolic network of the manufacturing system(52175480)",the National Natural Science Foundation of China "Research on the inherent energy efficiency attribute of the machining manufacturing system and its optimal creation method(517775392)",and the Hubei Provincial Natural Science Foundation "Research on the micro scale industrial carbon emission mechanism based on the evolution of the hybrid PN-Ma S system(2017CFB415)".In view of the "double carbon" problem faced by the development of China’s iron and steel industry,the industrial metabolism theory suitable for iron and steel manufacturing system is proposed by referring to the metabolic engineering theory and material flow theory,combined with the material and energy metabolism behaviors and pathways,and studied the low-carbon regulation of the steel manufacturing system.The main research contents of this paper are as follows:(1)The construction mode of metabolic node and the expression mode of metabolic pathway are described.Combined with the production process of iron and steel manufacturing system,the "point" metabolic theory and "line" metabolic theory are proposed to describe the metabolic pathway and metabolic behavior of "point" and "line" respectively.According to the metabolism mechanism of material and energy,the "BRL" metabolism theory(Basic metabolism,Required metabolism,Loss Metabolism,BRL)of iron and steel manufacturing system is defined.A theory of industrial metabolism applicable to steel manufacturing system is formed to provide a theoretical basis for the study of low carbon regulation of steel manufacturing system.(2)According to the industrial metabolism theory of iron and steel manufacturing system,analyze the material and energy metabolism of "point" and "line",explore the ways of material and energy metabolism at different scales,and understand the material and energy metabolism behaviors.The "BRL" metabolism of "point" is analyzed from the mechanism of substance metabolism.The metabolic behavior of the "line" is analyzed from the view of flow matching and flow loss.On this basis,the internal relationship between industrial metabolic behavior and carbon emission is deeply analyzed,and the carbon emission model is quantified.(3)According to metabolic engineering,industrial metabolism theory,conservation law of matter and energy,the dynamic industrial metabolism model of "point and line" of iron and steel manufacturing system is constructed.Taking blast furnace ironmaking as an example,the mechanism of material energy metabolism at the level of chemical reaction is described,and the coupling mode and mathematical model of material metabolism based on chemical dynamics are established.The dynamic visual expression of metabolites is realized through the Any Logic platform using the process library design,and the internal relationship between the "BRL" metabolism and carbon emissions of blast furnace ironmaking is analyzed.The "line" pathway takes the BF-BOF process as an example to realize the visual expression of material metabolism dynamics.The analysis of dynamic industrial metabolism of "point and line" and "BRL" metabolism reveals the difference of carbon emission,and clarifies the direction of low-carbon regulation for iron and steel enterprises.(4)Construct the mathematical model of industrial metabolism to realize the regulation of material and energy metabolism.Based on the theory of parsing-integration,"point and line" and "BRL" metabolism,the mathematical model of material and energy metabolism of each production unit of iron and steel manufacturing system is constructed,and the low-carbon objective function is established.NSGA-II genetic algorithm is used to solve the low carbon model,and the optimal adaptation values of low carbon decision variables are obtained.Compared with the actual production data of iron and steel enterprises,the validity of the model is confirmed.The dynamic control results of material and energy under different crude steel output are simulated and analyzed,and the methods and paths of low-carbon manufacturing in iron and steel enterprises are summarized,providing new means and methods for the optimization and intelligent control of material and energy in iron and steel enterprises. |
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