Analysis of ash accumulation in the exhaust gas system of gas burned sleeve kiln and technical upgrade
Since its introduction from Germany,the circular sleeve lime kiln has been widely used by many steel plants and has become the mainstream kiln type for high activity metallurgical lime production.Sleeve kiln has the advantages with high-quality active lime products,strong fuel adaptability,low comprehensive energy consumption,safe operation,convenient equipment maintenance,high operation rate,low investment cost,high environmental protection level,small footprint,and a wide range of available ash and stone particle sizes.In gas shortage sleeve kiln,which uses a mixture of converter gas,blast furnace gas and coke oven gas as fuel,a large amount of dust is always accumulated on the top of the exhaust gas pipeline and heat exchanger bundle tube,which is easy to cause a sharp decline in the efficiency of the heat exchanger and unable to meet production requirements.It is forced to shut down the kiln for maintenance with high maintenance and operation costs.In this paper,the ash accumulating mech-anism of the exhaust gas system in gas fired rotary kilns was analyzed and the technical breakthroughs in adding cold medium process purge of and automatic pulse ash cleaning device were carried out at the exhaust gas horizontal tube and top of the heat exchanger,respectively.The results showed that the ash accumulation in the exhaust gas system of rotary kilns has been greatly alleviated,more efficient utilization of waste heat resources in the flue gas of rotary kilns and stable production of rotary kilns could be obtainedwith good economic and social benefits.
gas burned sleeve kilnexhaust gasheat exchangerash accumulationefficiency
万方数据
维普
