内燃式热风炉燃烧器结构优化

针对内燃式热风炉在燃烧期烟气中CO含量超标问题开展研究工作,提出一种改进型的矩形燃烧器结构,在煤气通道中加入挡板来改变高炉煤气的流动方向。以某公司3号高炉热风炉为研究对象,建立了内燃式热风炉矩形燃烧器和燃烧室的三维模型。利用CFD模拟技术对矩形燃烧器的原始结构和改进后的结构进行燃烧模拟,在矩形燃烧器中加入的煤气挡板分别采用45°、60°、75° 3种倾斜角度放置,分析在不同倾斜角度下的温度场和CO浓度场。与原始结构的结果进行对比,结果表明,优化结构之后燃烧室出口截面的温度场中高温区范围有所扩大,两端眼角处的CO平均体积分数有一定程度减少。当煤气挡板的倾斜角度为60°时出口截面平均温度上升最大,平均温度从1 669 K上升到1 676 K,出口烟气中的CO平均体积分数下降最多,CO平均体积分数从0.007 028%下降到0.005 678%。

Structural optimization of internal combustion hot stove burner

Aiming at the problem that CO content in the flue gas of internal combustion hot blast stove exceeded the standard during the combustion period, an improved rectangular burner structure was proposed. A baffle was added to the gas channel to change the flow direction of blast furnace gas. Taking the hot stove of No.3 blast furnace in a company as the research object, three-dimensional model of rectangular burner and combustion chamber of internal combustion hot stove was established. Combustion simulation was carried out by CFD simulation technology for original structure and modified structure of rectangular burner, the gas baffles added to the rectangular burner were placed at three inclination angles of 45°, 60°, and 75°, respectively, and the temperature field and CO concentration field at different inclination angles were analyzed. Compared with the results of original structure, the results show that the high temperature area in temperature distribution of combustion chamber outlet section is enlarged after optimization, and the average volume fraction of CO at the corners of both ends is reduced to a certain extent. When the inclination angle of gas baffle is 60°, the average temperature of outlet section increases the most, the average temperature rises from 1 669 K to 1 676 K, and the average volume fraction of CO in the outlet flue gas decreases the most, from 0.007 028% to 0.005 678%.