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In the production process of shale oil, calcium carbide and ferroalloy refining enteprises, a large number of low-calorific value industrial exhaust will be produced. Most of them are dry distillation gas. The components of these combustible gases are mainly hydrogen and carbon monoxide, 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 Ferroalloy off-gas, Calcium carbide furnace off-gas, and Oil shale retort gas, and the likes of these.
1. Ferroalloy off-gas, also known as mineral furnace off-gas, refers to a toxic and flammable industrial waste gas generated during the high-temperature smelting process of ferroalloys. It is a waste gas containing CO, dust, and volatile metal oxides generated during the smelting process of a mineral thermal furnace. Its main components are carbon monoxide (CO), and the main components of ferroalloy exhaust gas are carbon monoxide (60% -80%), hydrogen (5% -15%), and carbon dioxide (CO₂) with low content. Its low heating value (LHV) is 7-11.5 MJ/m³, which is about one-third of natural gas. Belongs to unconventional combustible gases. After purification, the exhaust gas can be used as fuel for power generation.
2. Calcium carbide furnace off-gas, refers to the combustible exhaust gas emitted from the reaction of calcium carbide (CaC₂) with water at high temperatures during the production process of calcium carbide. It is an industrial by-product gas with high calorific value and high carbon monoxide content generated during the production process of calcium carbide. 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. Due to its high temperature (400-800℃), 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.
3. 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. The content of its components varies significantly depending on geological conditions, organic matter types, and processing techniques. Combustible gases are mainly methane, hydrogen, and carbon monoxide, which are one of the main products in the dry distillation process. Typical calorific value range: 8-12 MJ/m ³. Similar to coal gas, it can be used as fuel for power generation or heating.
This gas containing combustible carbon monoxide is a low calorific value gas fuel that can be used as fuel for power generation after purification.
Gas requirement of Industrial Tail 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 (O₂ Volume) ≤ 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.
