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福山厂4号高炉于1994年4月底安装了每小时喷煤粉72吨能力的煤粉喷吹系统。在6个月后的10月份,实现了最高的喷煤水平。最后,成功地达到最大喷煤比(每吨铁水230公斤煤粉),按月计算平均喷煤量每吨铁水为218公斤。使高比例喷煤成为可能的主要技术特征如下:(1)采用最新设计的偏心双喷枪,燃烧效率提高;(2)使用还原性和熔化特性都很好的混合球团烧结矿;(3)实行煤气流分布的最佳控制,以保持炉内的透气性。此外,用死料堆探测器分析了高炉下部的炉内现象,证明了通过改进喷枪和提高炉料的性能,可以保持死料堆里良好的透气性。
Fukuyama Plant No. 4 blast furnace at the end of April 1994 installed a capacity of 72 tons of pulverized coal pulverized coal injection system. In the six months to October, the highest PCI level was achieved. Finally, the maximum coal injection ratio (230 kg of coal per tonne of molten iron) was successfully achieved, with an average of 218 kg / ton of molten coal being calculated on a monthly basis. The main technical features that make it possible to use a high percentage of PCI are as follows: (1) Improved combustion efficiency with the newly designed off-center dual spray gun; (2) Use of mixed pellet sinter with good reducibility and melting properties; (3) Implementation of optimal control of the gas flow distribution, in order to maintain the permeability of the furnace. In addition, the analysis of the furnace in the lower part of the blast furnace with a dead-heap detector proves that good air permeability can be maintained in the heap by improving the lance and improving the performance of the charge.