Efficient combustion characteristics of converter low-quality gas from steelmaking in cyclone separator
At the beginning and end of oxygen blowing in converter steelmaking,the converter gas produced is of low quality(low CO concentration with a small amount of O2),which is explosive and cannot be recycled.At present,the converter low-quality gas is burned unorganized in the gasification cooling stack by entraining air,which is difficult to realize the efficient combustion and utilization of the gas in the gasification cooling device.The characteristics of strong swirl and strong mixing in the cyclone separator are conducive to the mixed combustion of converter low-quality gas while removing dust from converter gas.In order to solve the difficulty in efficient combustion and utilization of converter low-quality gas,based on a new process of converter gas full dry recovery,the flow and combustion of converter low-quality gas in the cyclone separator were studied by CFD.The results show that:the excess air coefficients near the center of gasification cooling stack are lower than 0.4,all the excess air coefficients in the cyclone separator are higher than 1,the converter low-quality gas is fully mixed with air in the cyclone separator;The higher turbulent kinetic energy and local vortex improve the mixing of converter low-quality gas and air in the cyclone separator;The combustion area in the gasification cooling stack is narrow,the average concentration fraction of OH in the flow section is 305×10-6,and the combustion intensity is low;The combustion area in the cyclone separator is widely distributed,the average concentration fraction of OH in the flow section reaches 650×10,and the combustion intensity is high;After the converter low-quality gas flows through the cyclone separator,the combustion efficiency increases from 74.64％ to 98.86％ in the pre combustion stage,and the combustion efficiency increases from 44.08％ to 95.05％ in the post combustion stage;The efficient combustion of converter low-quality gas is realized in the cyclone separator.
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