Research And Application For Negative Energy Converter Steelmaking Of 60-ton Converter Of Shiheng Special Steel Plant

Nowadays, the increasing energy crisis restricts the development of the global economy, so energy conservation and energy consumption reduction have become a worldwide issue. Eleventh Five-Year Plan of Chinese government has proclaim clearly that the circular economy must be developed and cleaner production must be extended to form the healthy economical growth which is low-input, low-consumption, low-emissions but high efficiency. In China, which is the largest steel producing country in the world, and also relatively lack of resources and energy, promotion of energy saving technology has become the key to ensure the development of China's steel industry sustainably. In China, the converter steel-making ratio exceeds 90%, so it is very important to ensure the healthy development of steel industry through promotion of Negative Energy Steelmaking which is a main steel-making technology to achieve emission reduction targets.The main contents of this thesis is to research related technologies to reduce the energy consumption of the converter steel-making and to achieve Negative Energy Steelmaking, which contain gas recovery technology, vapor recovery technology and other energy saving technologies. The research methods of the subject is organized Through the transformation of equipment, optimizing the operation process, and promotion the use of new technology in the converter actual production process, the efficiency and advancement are discussed in order to achieve effective reduce energy consumption. The main works of the thesis are performed as the following sections:The full process of converter and continuous casting steelmaking and its efficient production are researched and practiced. Applying the implementation of equipment upgrades, the capacity matching of the converter-continuous casting production is solved. And through the development of production and the establishment of measures, the key process of the control points is ensured. Finally, through the implementation of strict management and supervision, the smooth production line effectively can also be ensured, which laids a solid foundation for achieving Negative Energy Steelmaking.The factors to influence the index of Negative Energy Steelmaking are investigated and discussed, in terms of the technology and operation of the converter steelmaking. Based on the stabilizing the level of blast furnace operation and vaporization, as well as gas recovery operations, and the use of some advanced technologies (such as "a can in the end" technology into the furnace hot metal, furnace ladle desulfurization technology, refining slag recycling technology, ladle brick puzzle mixed materials technology etc), the level of gas recovery and vapor recovery are effectively stabilized, and oxygen, electricity and gas, refining energy consumption indicators are effectively reduced. As a result, the index of Negative Energy Steel-making is performed successfully.The factors to influence the index of Negative Energy Steelmaking are investigated and discussed, in the viewpoint of the device. Through improving the networks the recycling of the gas and vapour increases. And through the introduction, digestion and absorption of new energy-saving technology and now equapments, such as oxygen lance nozzle parameters, the gas, vapor recovery yield and quality are improved obviously, and simultaneously the refining oxygen consumption, electricity consumption and gas consumption are effectively reduced so as to ensure Negative Energy Steelmaking converter targets successfully.The methods, conclusions and practice of this thesis give a good example or can be considered as the benchmark for relevant steelmaking companies in China.