Research On Production Scheduling In Iron And Steel Scrap Remanufacturing Under The Background Of Carbon Reduction

China’s iron and steel industry is developing very quickly, the government attaches great importance to the development of scrap iron and steel industry. At present, China’s crude steel production accounts for about 50 percent of world’s crude steel production. However, China’s crude steel production is mainly based on BF-BOF, while the production which is based on Steel scrap-EAF is accounted for only about 10%. It is far behind the developed countries in the world. At present, domestic and foreign scholars’ research on carbon emissions of the iron and steel industry mainly included carbon emissions trading and the measurement of the long process of carbon emissions. Few studies on scrap steel remanufacturing production scheduling optimization have been done. Thus, research on production scheduling in Iron and Steel Scrap remanufacturing with carbon emissions is not only meeting the needs of energy conservation, green production, but also more in line with the development trend of the steel industry.As the "Steel scrap-EAF" meets the needs of the production process which could save more energy and reduce more carbon emissions and is more in line with the development trend of the steel industry, the government also attaches great importance to the development of iron and steel scrap industry. There are a large number of research results on BF-BOF about production scheduling. Ori the contrary, research on production scheduling in iron and steel scrap remanufacturing under the background of carbon reduction is special in the following several aspects. (1) carbon emissions econometric model. Traditional long process known as "BF-BOF" production process and short process known as "Steel scrap-EAF" production process have significant differences in the measurement of carbon emissions. The measurement of BF-BOF’s carbon emissions is based on the carbon balance principle. The measurement of Steel scrap-EAF’s carbon emissions are only related to electricity. (2) The processing time is unchanged and processing time is controllable. In contrast, the scrap iron and steel processing and distribution system, processing technology and equipment is still in its infancy. The quality of scrap iron and steel needs to be improved. It caused two cases including the processing time is unchanged and the processing time is controllable during the production scheduling in the steel companies that used "Steel scrap-EAF". (3) Single-target and Multi-target. The article will regard scrap iron and steel manufacturing as the main line and study scrap iron and steel production remanufacturing process. Then analysis of all aspects of the production will be done. In the process of the iron and steel production scheduling, the conventional optimization goal is to make the minimum total completion time and the largest output. Under the circumstance of saving energy and reducing carbon emissions, Carbon emissions should be considered as one of the objective functions in the model. Therefore, single-target model and multi-target model should be both analysed. Carbon emissions’ impact of the production scheduling problem when carbon emissions as the objective function and constraints needed to be analyzed with the actual situation of iron and steel scrap remanufacturing production scheduling process. Meanwhile, that the recycling sources and types of scrap steel are various will cause two cases that the processing time is determined and the processing time is controllable.In conclusion, the thesis will summarize research on scrap steel remanufacturing, remanufacturing production scheduling and Iron and steel industry production scheduling under the background of carbon emissions reduction. Production process of scrap steel remanufacturing will be analyzed. Highlighting the features of iron and steel scrap remanufacturing remelting subsystem and analyzing uncertainties of production scheduling in iron and steel scrap remanufacturing. carbon emission model will be built. Contents of this thesis contains the following four parts:1) Research on the features of production scheduling in iron and steel scrap remanufacturing under the background of carbon emissions reduction; 2) Research on the carbon emissions model of production scheduling in iron and steel scrap remanufacturing under the background of carbon emissions reduction; 3) Research on the production scheduling model of iron and steel scrap remanufacturing under the background of carbon emissions reduction; 4) Research on the production scheduling algorithm of iron and steel scrap remanufacturing under the background of carbon emissions reduction. By this research, it can enrich remanufacturing production scheduling theory of the process industries and provide theoretical guidance for the Iron and Steel Scrap industries in making planning and scheduling schemes.