Here, blast furnace gas refers to a recoverable waste byproduct that is collected, treated, and reused within the steel plant. Blast furnace gas is a combustible gas generated as a byproduct during the blast furnace iron-making process. This gas, containing combustible carbon monoxide, is a low-calorific-value fuel gas that can be used as internal fuel within metallurgical plants, such as heating steel billets in hot rolling processes or preheating molten steel ladles, and may also be supplied for civilian use. Blast furnace gas is a byproduct generated during the ironmaking process, with main components including CO, CO2, N2, H2, CH4, etc. The combustible component CO accounts for approximately 25%, while H2 and CH4 contents are very low. CO2 and N2 make up about 15% and 55% respectively, and the calorific value is around 3300 kJ/m³. The composition and calorific value of blast furnace gas depend on the type of fuel used in the blast furnace, the variety of pig iron produced, and the smelting process.
