What materials are used for the equipment and pipelines in coke oven gas systems?

Coke oven gas pipelines typically use materials that are resistant to high temperatures and corrosion, such as stainless steel or carbon steel. .

The materials, equipment, and pipelines used for coke oven gas systems are chosen based on various factors such as the working environment, properties of the medium, safety requirements, and cost-effectiveness. The following is a detailed analysis of the material selection for coke oven gas pipelines along with the rationale behind it: Material Selection – Corrosion resistance: Coke oven gas contains various components, including coal tar, naphthalene and other substances that tend to condense, as well as potentially corrosive gases. Therefore, the pipeline material must have good corrosion resistance to prevent leaks and safety incidents caused by corrosion. Common corrosion-resistant materials include stainless steel and alloy steel; these materials can effectively resist corrosive substances present in coal gas. High-temperature resistance: Coke oven gas pipelines are exposed to high temperatures during operation; therefore, the material used for these pipelines must have good high-temperature resistance to ensure their stable performance even in such conditions. At high temperatures, some ordinary steels may soften, deform, or experience a decrease in strength, whereas materials such as alloy steels and stainless steels can maintain good mechanical properties and stability at higher temperatures. Sealing performance: Coke oven gas pipelines need to have good sealing properties to prevent gas leaks. This requires that the pipe material be capable of forming a reliable seal during processing and installation, and maintain stable sealing performance throughout long-term operation. Economics: While meeting the aforementioned performance requirements, it is also necessary to consider the cost-effectiveness of the pipe material. Pipes made of different materials vary in terms of price, processing difficulty, and maintenance costs. Therefore, a comprehensive comparison and selection based on actual circumstances are necessary. Specific material examples: Stainless steel: Stainless steel possesses excellent corrosion resistance and high-temperature tolerance, as well as good workability, making it easy to weld and install. In coke oven gas pipelines, stainless steel is commonly used to manufacture critical components and parts prone to corrosion. Alloy steel: Alloy steel improves the properties of steel by adding alloying elements, endowing it with better high-temperature resistance, corrosion resistance, and mechanical strength. In coke oven gas pipelines, alloy steel is commonly used to manufacture pipes in high-temperature sections and components subjected to high stresses.

If it is raw gas, carbon steel will suffice; for gas pipelines used in the purification process, it is recommended to use stainless steel, as this can avoid many problems in the future.