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控制适宜的理论燃烧温度已受到国内外的重视,近代大型高炉通常把它控制在1900～2350℃的范围内。日本把风口回旋区的理论燃烧温度控制在比铁水温度高800℃的水平上,一般为2100～2300℃。适宜的充足的理论燃烧温度是保证矿石还原(主要指Fe0.947+C—→0.947Fe+CO)和渣铁过热的必要条件,因此理论燃烧温度必须有足够的水平,过低不行。但是,理论燃烧温度过高也会带来许多害处:(i)使软熔带上移,初渣过早熔化。当FeO被还原后,炉渣熔点上升,又会重新凝结,易造成粘结、挂料,使透气性变坏,下料不稳,以致结瘤。(ii)增加碱金属(K_2O、
Control of the appropriate theoretical combustion temperature has been the focus of attention at home and abroad, the modern large blast furnace usually control it in the range of 1900 ~ 2350 ℃. Japan, the tuyere area of the theoretical combustion temperature controlled at a temperature higher than the hot metal temperature of 800 ℃, usually 2100 ~ 2300 ℃. Appropriate and adequate theoretical combustion temperature is necessary to ensure ore reduction (mainly Fe0.947 + C- → 0.947Fe + CO) and slag iron overheating, so the theoretical combustion temperature must be sufficient, not too low. However, theoretical burning temperatures have many disadvantages: (i) the reflow ribbon is moved up and the primary slag melts prematurely. When the FeO is reduced, the melting point of the slag increases, it will re-condensation, easy to cause bonding, hanging materials, so that deterioration of air permeability, feeding instability, resulting in nodulation. (ii) increase of alkali metal (K2O,