软熔带类型对高炉内未燃煤粉分布影响的数值模拟

Numerical Simulation for the Influence of Cohesive Zone Shape on Distribution of Unburned Pulverized Coal in Blast Furnace

为了改善高炉炉况、降低未燃煤粉对高炉的负面影响,利用"Euler-Euler"法对高炉内未燃煤粉的堆积分布进行了数值模拟.考察了倒V型、V型和W型软熔带高炉内的未燃煤粉分布,以及软熔带形状对未燃煤粉分布的影响,并比较了三种软熔带高炉堆积未燃煤粉量的多寡和高炉各区域未燃煤粉堆积量.计算结果表明:未燃煤粉主要堆积在高炉软熔带下方;死料柱、风口回旋区下方、软熔区域、软熔带顶部和根部是未燃煤粉容易堆积的区域.W型软熔带是最佳的高炉操作模式,具体表现在:未燃煤粉在高炉内分布相对均匀;在一定压差条件下可容纳较多煤粉.

In order to improve blast furnace(BF)operation and reduce the negative influence of unburned pulverized coal on BF performance,the"Euler-Euler"method was used to simulate the distribution of unburned pulverized coal in BF.The distribution of unburned pulverized coal in BF with three kinds of cohesive zone and the influence of cohesive zone shape on the distribution of unburned pulverized coal were investigated.For different cohesive zones,the total amount of unburned pulverized coal and the regional accumulation amount of unburned pulverized coal were compared.The simulation results show that the unburned pulverized coal is mainly accumulated below the cohesive zone of BF.The deadman,the region below the raceway,the cohesive area,and the top and root of the cohesive zone are the main regions where the unburned coal powder easily accumulates.The W-shape cohesive zone is the best blast furnace operation mode.The reasons are:the distribution of unburned pulverized coal in BF is relatively uniform;more pulverized coal can be accommodated under a specific differential pressure condition.