基于数值模拟的转炉煤气富氧燃烧优化研究

Research on Optimization of Oxygen Enriched Combustion of Converter Gas Based on Numerical Simulation

摘要: 本文基于Fluent软件对转炉煤气富氧燃烧进行模拟计算研究优化方案，通过对比分析数值计算得到的速度分布和温度分布图，探索富氧浓度、燃气热值和氧气分流比等因素对转炉煤气燃烧的影响。得到以下结论：富氧浓度越大，转炉煤气核心区域的燃烧越剧烈，其温度越高，但随着富氧浓度的增大，其助燃气体的流量减少，不利于热量的传导。热值越高的转炉煤气反应更剧烈，导致核心反应区温度更高，同时高温进一步增强燃烧反应。但燃气热值增高的同时，其进入燃气入口的气流会减少，燃烧区域的气流速度会降低，不利于热量的扩散。随着氧气分流比的升高，两侧气流速度会升高，有利于热量传递，但燃烧区域核心位置的氧气浓度会降低，使得燃烧反应不充分，因此使用环氧烧嘴燃烧时要选择燃气和氧气混合充分的氧气分流比。

Abstract: This article is based on Fluent software to simulate and optimize the oxygen rich combustion of converter gas. By comparing and analyzing the velocity and temperature distribution maps obtained from numerical calculations, the influence of factors such as oxygen concentration, gas calorific value, and epoxy ratio on the combustion of converter gas is explored. The following conclusion can be drawn: the higher the oxygen enrichment concentration, the more intense the combustion in the core area of the converter gas, and the higher its temperature. However, as the oxygen enrichment concentration increases, the flow rate of the combustion supporting gas decreases, which is not conducive to heat conduction. The higher the calorific value of the converter gas, the more intense the reaction, resulting in a higher temperature in the core reaction zone, while the high temperature further enhances the combustion reaction. But as the calorific value of gas increases, the airflow entering the gas inlet will decrease, and the airflow velocity in the combustion area will decrease, which is not conducive to the diffusion of heat. As the epoxy ratio increases, the airflow velocity on both sides will increase, which is conducive to heat transfer. However, the oxygen concentration in the core position of the combustion zone will decrease, resulting in insufficient combustion reaction. Therefore, when using an epoxy burner for combustion, it is necessary to choose an epoxy ratio that is fully mixed with gas and oxygen.