The hydrogen sulfide and carbon dioxide absorption tower, a key non-standard equipment in the -101°C low-temperature methanol washing system, has recently been successfully put into operation at the coal-based methanol plant of Erdos Jinchengtai Chemical Company in Inner Mongolia. This milestone marks a significant achievement in the localization of the low-temperature methanol washing process in China. The successful implementation also provides essential physical data and foundational information for the revision of the national standard "low-temperature alloy steel plates for pressure equipment."
As one of the critical components in the main process of low-temperature methanol washing, this tower is responsible for removing hydrogen sulfide and carbon dioxide from the process gas. It operates under high pressure and extremely low temperatures, requiring advanced materials and sophisticated design. For decades, China relied on imported technology and steel sheets to manufacture such equipment.
However, Wuhan Donghai Petrochemical Heavy Equipment Co., Ltd. has made a breakthrough by developing the first hydrogen sulfide/carbon dioxide absorption tower in China using domestically produced 08Ni3DR steel. This innovation was successfully applied to the 1.8 million tons per year coal-to-methanol project at Erdos Jinchengtai Chemical Company. In a previous phase of the project, 08Ni3DR steel was also used in the production of low-temperature pressure vessels, marking an important step toward self-reliance in critical industrial equipment.
During a 120-day trial run, the absorption tower outperformed its design specifications in terms of steam consumption and washing efficiency. Additionally, the overall operating cost at full load was found to be lower than that of similar products worldwide, demonstrating the technical and economic advantages of the locally developed solution.
This achievement not only strengthens China's position in the field of clean energy and chemical processing but also sets a new benchmark for domestic manufacturing capabilities in high-performance industrial equipment.
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