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In petrochemical and calcium carbide refining production enterprises, a large number of low calorific value industrial exhaust gas will be produced during the production process. Most of them are dry distillation gas. The components of these combustible gases are mainly CO, H₂ and CH₄. They are featured by complicated components, contain impurities, unstable components, large toxicity, inflammable and explosive, and most of the exhaust are burned and discharged except for a few for refinery's own use.
Our genset can adapt to a variety fuel of high, medium and low calorific value. Industrial off-gas that can be used for power generation includes Oil shale retort gas, Calcium carbide furnace off-gas, and the likes of these.
1. Oil shale retort gas, refers to the combustible gases produced during the extraction or processing of oil shale, such as in-situ cracking, surface distillation, etc. Its generation occurs in a closed reactor, with a temperature typically controlled between 450 - 550°C, used for simultaneous recovery of shale oil and combustible gases. It is one of the main products in the dry distillation process. Its component content varies significantly depending on geological conditions, organic matter types, and processing techniques, similar to coal gas, which can be used as fuel for power generation or heating.
The combustible gases in the Oil shale retort gas are mainly methane, hydrogen, and carbon monoxide, with a typical calorific value range: 8 - 12 MJ/m³.
2. Calcium carbide furnace off-gas, also known as Calcium carbide furnace gas, refers to the combustible gas produced as a byproduct during the production of calcium carbide. Mainly derived from the reaction process of limestone and coke in the calcium carbide furnace at high temperatures. Due to its high temperature, high dust content, and easy tar precipitation, direct discharge can cause serious environmental pollution and resource waste. Therefore, it must be purified and comprehensively utilized.
Its main component is CO (accounting for 70% -90% by volume), and it contains H₂ (0 - 10%), CO₂ (1 - 10%), CH₄, N₂, O₂, dust (50 - 150 g/Nm³), as well as trace impurities such as tar and cyanide. Typical calorific value range: 10 - 15 MJ/m³.
Gas requirement of Industrial off-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.
