Research and cognition on key technical problems of high blast temperature for modern blast furnace
ZHANG Fu-ming1,2, YIN Guang-yu2,3, LI Xin2,3
1. Chief Engineer Office,Shougang Group Co., Ltd., Beijing 100041, China; 2. The Research Center of Engineering Technology of Three Dimensions Simulating Design of Beijing, Beijing 100043, China; 3. Ironmaking Department,Beijing Shougang International Engineering Technology Co., Ltd., Beijing 100043, China
Abstract:Increasing the blast temperature can effectively reduce the fuel consumption of blast furnace (BF) and promote the BF stable and smooth production, which is one of the important developing directions of green-low carbon ironmaking technology. Heat transformation process and heat transfer characteristics of hot blast stove are researched. Relationship between heating surface and blast temperature of hot blast stove is expounded through the study and analysis of heat transfer mechanism, and the viewpoint of increasing heat flux to improve heat transfer in hot blast stove is put forward. Relationships between theoretical combustion temperature, dome temperature and blast temperature of hot blast stove are studied. Technical innovation and practice of high blast temperature are introduced, which applies low calorific value blast furnace gas and recovering flue gas waste heat of hot blast stove by coupling preheating and energy cascade utilization. Technical elements to realize intelligent operation of hot blast stove are put forward. Technological methods of controlling dome temperature and suppressing large amount of NOx,and technical measures to effectively prevent intergranular stress corrosion of hot blast stove shell are discussed. Realizing high efficiency utilization and high value conversion of low calorific value gas, increasing blast temperature, reducing fuel ratio and CO2 emission are the key-common technologies of blast furnace ironmaking in the future.
张福明, 银光宇, 李欣. 现代高炉高风温关键技术问题的认识与研究[J]. 中国冶金, 2020, 30(12): 1-8.
ZHANG Fu-ming, YIN Guang-yu, LI Xin. Research and cognition on key technical problems of high blast temperature for modern blast furnace[J]. China Metallurgy, 2020, 30(12): 1-8.