| 摘要 |
<p>PURPOSE:To effectively prevent the erosion of furnace wall refractories by secondary combustion by providing tuyeres to be used exclusively for blowing gaseous hydrocarbon to the lower part of a converter throat and specifying the height from the furnace bottom and blowing angle of the tuyeres. CONSTITUTION:The tuyeres 5 to be used exclusively for blowing the gaseous hydrocarbon (gaseous methane, gaseous propane, etc.) or the gas contg. a part of the gaseous hydrocarbon are provided to the lower part of the throat 4 of the composite converter 1 having, for example, a top blowing lance 2 and bottom blowing tuyeres 3 in combination at the time of executing converter operation by secondary combustion method. The height of the tuyeres 5 from the furnace bottom, designated as HL, and the height from the furnace bottom to the throat, designated as HV, are regulated to 0.6HV<=HL<=0.9HV and the blowing angle theta of the tuyeres 5 to horizontal is regulated to -30 deg.<=theta<=30 deg.. The gas blown from the tuyeres 5 is uniformly spread to the sections exposed to the high-temp. gas near the throat, etc., to equally lower the temp. of the sections and to effectively prevent the erosion of refractories. The exhaust gas having high calory is recoverable.</p> |
