Maoming Ethylene Aromatic Hydrocarbon Installations Successfully Rebuilt and Expanded

The reporter recently learned from the chemical division of Maoming Branch, Sinopec, that the first production unit of the company’s 1 million-ton/year ethylene renovation and expansion project—the new aromatic hydrocarbon extraction unit—has successfully completed its initial phase. This unit, with an annual capacity of 460,000 tons, replaced an old facility that had been in operation for 56 years. The entire process was smoothly initiated, achieving the shortest startup time for similar equipment in the country, from feeding to producing qualified products. It is also the largest aromatics production facility in South China. The new aromatics extraction plant is one of eight key facilities within the 1 million-ton/year ethylene project, with a total investment of 80 million yuan. After the upgrade, the annual output of the plant will increase from 160,000 tons to 460,000 tons. The products include benzene, toluene, mixed xylene, and by-products such as raffinate oil. By the end of March, the facility had successfully reached the intermediate transfer stage, marking a major milestone in the project. To ensure safe and efficient operations, Maoming Ethylene implemented the JHA (Job Hazard Analysis) template to identify potential risks during the startup process, covering aspects like personnel, machinery, environment, and materials. They developed control measures to mitigate these risks, ensuring a safe and successful start-up. To reduce costs and set high standards for the new equipment, every step—from purging, airtight testing, standalone trials, to intermodal transportation and formal commissioning—was carefully managed. This rigorous approach laid the foundation for a safe and cost-effective operation. On April 18th at 10:00 AM, the new aromatics plant began introducing solvents. By 1:00 PM on April 19th, the system started feeding materials. On April 22nd, it produced its first batch of qualified products. That same day, the plant successfully integrated both the old and new systems, completing the process nearly five days ahead of the original schedule. This achievement marks the fastest startup time for similar equipment in China, minimizing losses during commissioning and fulfilling the overall goal of safe and economical operation. It is expected that the new aromatics plant will bring monthly economic benefits of around 3 million yuan to the company. As the largest aromatic hydrocarbon production facility in South China, it will play a crucial role in meeting the growing demand for aromatic compounds in the Pearl River Delta region. This development is not only beneficial for the company but also has significant implications for the local economy, supporting industrial growth and regional development.

Iron Based Alloy Powder

Iron-based alloy powder is commonly used in plasma transfer arc welding (PTAW) due to its excellent mechanical properties and high resistance to corrosion and heat. This type of powder is typically composed of iron as the base metal, along with various alloying elements such as nickel, chromium, molybdenum, and tungsten.

The specific composition of the iron-based alloy powder may vary depending on the desired properties and application requirements. For example, adding nickel can increase the strength and toughness of the weld, while chromium enhances the corrosion resistance. Molybdenum and tungsten are often added to improve the high-temperature strength and creep resistance of the weld.

Iron-based alloy powders for PTAW are available in various particle sizes, typically ranging from a few micrometers to several hundred micrometers. The powder is usually fed into the plasma arc through a powder feeder, which ensures a controlled and consistent supply of powder during the welding process.

During PTAW, the powder is melted and deposited onto the workpiece, forming a weld bead. The high energy plasma arc provides the heat necessary to melt the powder and the base metal, creating a strong and durable weld joint.

Overall, iron-based alloy powder for plasma transfer arc welding offers excellent weldability, high mechanical properties, and resistance to corrosion and heat, making it suitable for a wide range of applications in industries such as aerospace, automotive, and power generation.

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