Research and Application on Blast Furnace Gas Dry Cleaning Technology of Huge Blast Furnace

摘要

Blast furnace gas (BFG) dry bag filter cleaning technology is an important technical innovation in 21st century to realize the energy saving, reduction of emission and clean production for blast furnace (BF). Compared with traditional BFG wet cleaning technology, it has increased gas cleanness, gas temperature and heat value, obviously reduced fresh water and power consumption during iron making process and also can increase efficiency of secondary energy source, reduce environment pollution. It is an important technical solution for cycling economy and sustainable development of iron and steel industry and become the developing orientation of BF iron making technology. The project of Shougang Jingtang iron and steel plant is a key project for restructuring of Chinese iron and steel industry and promotion of overall technological equipment level for iron and steel enterprises. The annual capacity of the iron and steel plant is 9.7 million tons, two 5500m~3 BFs have been built up with annual capacity of 8.98 million tons of hot metal (HM). It is the first in China to build huge BF above 5000m~3. The characteristics of design and technical equipment of huge BF above 5000m~3 in the world was studied and analysed during design. All independent innovation was performed. A series of innovative advanced technologies and process equipments were designed and developed independently such as bell-less top, top combustion hot blast stove, gas fully dry bag filter cleaning, long campaign life technology and improved screw type slag granulation process.