Factors affecting the composition of coke oven gas

The factors affecting the composition of coke oven gas mainly include the type, quality, and ratio of the coal fed into the furnace, the operating conditions of the coke oven (such as temperature, pressure, and age of the furnace), as well as the packing density and method of feeding the charge. The ratio of coal fed into the furnace, that is, the proportion in which different types of coal are mixed, directly affects the chemical reactions that occur during the coking process, thereby altering the content and proportions of various components in the generated gas (such as carbon monoxide, carbon dioxide, hydrogen, methane, etc.). For example, an increase in coals with high volatility will raise the proportions of hydrogen and methane in the syngas, while coals with high fixed carbon content may increase the formation of carbon monoxide. By adjusting the proportions, the composition of gas can be optimized to meet various industrial requirements. .

Coke oven gas is a flammable gas produced when several types of bituminous coal are combined to form coal for coking; it is generated through high-temperature carbonization in coke ovens, alongside coke and tar products. There are various factors that affect the composition of coke oven gas; the following is a detailed analysis: Factors affecting the composition of coke oven gas – Properties of the raw coal: Degree of metamorphism: The degree of metamorphism of the raw coal influences the physicochemical changes that occur during the carbonization process, thereby affecting the composition of the gas. Volatile matter: Volatile matter refers to the sum of gases and liquids produced during the carbonization of coal; it directly affects the yield and composition of coal gas. Ash: Ash refers to the inorganic minerals present in coal; these do not change during the carbonization process, but they affect the quality and yield of coal gas. Moisture: The moisture in coal evaporates during the carbonization process, consuming heat and potentially affecting the composition of the gas produced. Sulfur content: During the carbonization process, sulfur is converted into sulfides, which affect the composition and properties of coke oven gas. Coking process conditions: Methods of extracting gas from the coking oven: Different extraction methods affect the composition and yield of the gas. Size and temperature of the furnace top space: The size and temperature of the furnace top space affect the residence time and degree of reaction of the gas, thereby influencing its composition. Coal charging system and coking time: The coal charging system and coking time affect the reaction processes and conditions of coal within the furnace, thereby influencing the composition of the gas produced. The influence of the coal mixture fed into the furnace on the composition of coke oven gas: The coal mixture refers to the proportion of different types and properties of coal used in the coking process. The impact of blending ratios on the composition of gas is mainly reflected in the following aspects: Volatile matter content: Different coal types have varying levels of volatile matter, and the blending ratio affects the total volume of gas produced as well as the amount of combustible components. The addition of coal with high volatility increases the yield of gas and the content of combustible components such as hydrogen and methane. Sulfur and ash content: The ratio used has an impact on the levels of sulfides and ash in the gas. The inclusion of coal with high sulfur content will increase the sulfide level in the gas, while the use of coal with high ash content may raise the ash content in the gas. Degree of coal metamorphism: Coals with different degrees of metamorphism produce different gas compositions during carbonization. Therefore, the ratio affects the specific composition of the gas, such as the content of combustible components like hydrogen, methane, and carbon monoxide. In summary, there are various factors that affect the composition of coke oven gas, and the proportion of coal fed into the furnace is one of the important factors. By appropriately adjusting the proportions, the composition and properties of gas can be optimized to meet various industrial requirements.