In recent years, the reformed coke oven gas (COG) was proposed to be used as reducing gas in a shaft furnace. A mathematical model of gas flow based on the reformed COG was built. The effects of the pressure ratio of reducing gas to cooling gas (k) on the gas distribution in the shaft furnace were investigated. The calculation results show that k is an important operation parameter, which can obviously affect the gas distribution in the shaft furnace. The value of k should be compromised. Both too big and too small k values are not appropriate, and the most reasonable value for k is 1:1.33. Under this condition, the utilization coefficient of reducing gas, the utilization coefficient of cooling gas and the coefficient of upward gas are 0.94, 0.92 and 1.03, respectively. Based on the validation of physical experiments, the calculated values of the model agreed well with the physical experimental data. Thus, the established model can properly describe the reformed COG distribution in an actual shaft furnace.

近年来，提出了将重整焦炉气（COG）用作竖炉中的还原气。建立了基于改进后的COG的气体流动数学模型。研究了还原气与冷却气的压力比（k）对竖炉内气体分布的影响。计算结果表明，k是重要的运行参数，显然可以明显影响竖炉内的气体分布。k的值应妥协。k值太大和太小都不适合，并且k的最合理值是1：1.33。在这种条件下，还原气的利用率，冷却气的利用率和上升气的系数分别为0.94、0.92和1.03。基于物理实验的验证，模型的计算值与物理实验数据非常吻合。因此，所建立的模型可以适当地描述实际竖炉中重整后的COG分布。