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Metallurgical Gas, also known as Metallurgical by-product gas, refers to a combustible mixture of gases containing carbon monoxide produced during the steel smelting process. The composition of coal gas is generally affected by the different raw materials and production and recovery processes of coal gas, and its composition is also different. Its types include the overlapping category of Coke oven gas, and common types of metallurgical gas include Blast furnace gas, Linz-donawitz gas (Converter gas), and Ferroalloy gas, etc.
1. Blast Furnace Gas (BFG), refers to the combustible gas produced as a byproduct during the ironmaking process of a blast furnace. But the produced gas has a lower calorific value, which increases the difficulty of utilization. If coke oven gas is mixed, the calorific value will be increased.
The components of BFG: CO (23% - 30%), H₂ (2% - 4%), CO₂ (12% -15%), N₂ (51 - 56%), CmHn (0.2% - 0.5%), and a small amount of sulfur dioxide. The LHV is only around 3.5 MJ/Nm³. Belonging to low-heating value gas fuels.
2. Linz-Donawitz Gas (LDG), refers to the combustible gas produced by the action of carbon and oxygen in molten iron during the oxygen-blown converter steelmaking process. LDG contains no sulfur and very little hydrogen, making it an ideal fuel and chemical raw material.
The main components of LDG: CO (60% - 80%), CO₂ (15% - 20%), as well as N₂, H₂, and trace amounts of O₂. The LHV around 6.2 MJ/Nm³. Belonging to low-heating value gas fuels.
3. Ferroalloy Gas, also known as Ferroalloy off gas or SAF off gas, refers to the combustible gas mixture produced during the high-temperature smelting process of ferroalloys. Belonging to the by-products of metallurgical industry. This gas containing combustible carbon monoxide is a low-heating value gas fuel that can be used as fuel for power generation after purification.
The main components of Ferroalloy gas: Carbon monoxide (65% - 80%), Hydrogen (5% - 15%), and Carbon dioxide (CO₂) with low content. The Lower heating value (LHV) range: 7 - 11.5 MJ/m³, which is about one-third of natural gas. Belongs to unconventional combustible gases.
Gas requirement of Manufactured gas ：
● Gas calorific value ≥ 4.0 MJ/Nm³(Non pressurized sets); Gas temperature ≤ 40℃.
● Gas pressure 2.5-10 kPa; Pressure change rate ≤ 1 kPa/min.
● Hydrogen content (H₂ Volume) ≤ 60% (Non pressurized sets); Hydrogen content (H₂ Volume) ≤ 20% (Pressurized sets);
● Oxygen content (In hydrogen containing gas) ≤ 1%.
● Moisture content ≤ 40 g/Nm³，no free water.
● Impurity content ≤ 30 mg/Nm³; Impurity size ≤ 5 μm.
● Tar content ≤ 50 mg/Nm³.
● H₂S ≤ 50 mg/Nm³; Total sulfur content ≤ 100 mg/Nm³.
● NH₃ ≤20 mg/Nm³;
● C₆H₆ ≤ 50 mg/Nm³.
● C₁₀H₈ ≤ 50 mg/Nm³.
● Halogen compounds ≤ 50 mg/Nm³.
