Amount of air required for gas combustion

If a certain amount of hydrogen-rich off-gas is mixed into the blast furnace gas, the amount of air (or oxygen) required increases. Because hydrogen is a highly reactive element with a fast burning rate, it requires more oxygen to burn completely. Therefore, if it is necessary to increase the supply of air or oxygen without changing the coking time and other factors, it is to ensure that the hydrogen-rich exhaust gases can burn completely. .

This post was last edited by qugd on 2023-11-1 09:03. This requires calculations based on the composition of blast furnace gas and the proportion of hydrogen added to it. In the typical composition of blast furnace gas, in addition to large amounts of carbon monoxide, there are also small amounts of low-molecular-weight hydrocarbons; the oxygen consumption when hydrogen is added is then compared with that when no hydrogen is used. At the same time, the thermodynamic equilibrium during fuel combustion must also be taken into account. Although an equal amount of carbon monoxide and hydrogen produces the same amount of oxygen when burned, during high-temperature combustion, there is a chemical equilibrium regarding the amount of carbon dioxide formed; the higher the temperature, the lower the proportion of carbon dioxide produced. This is also the thermodynamic reason why it is not possible to reduce the proportion of carbon monoxide in blast furnace gas to very low levels.