On August 10th, Zhongyuan Oilfield Engineering Construction Corporation announced a major breakthrough: the company has successfully developed a specialized drying technology for non-thermal regenerative long-distance natural gas pipelines. This innovation was applied in key projects such as the West-East Gas Pipeline and Sinopec's Sichuan-East Gas Pipeline Project, both domestically and internationally. The successful implementation of this dry construction method fills a critical gap in China’s pipeline drying technology and marks a significant step toward domestic technological leadership.
Long-distance natural gas pipelines are essential for the efficient development and utilization of natural gas resources. In recent years, the importance of proper pipeline drying has become increasingly recognized by project developers, construction teams, and pipeline operators. Moisture inside the pipeline—whether in the form of liquid water or water vapor—is a primary cause of internal corrosion. Effective drying not only prevents damage but also ensures the long-term integrity and safety of the pipeline system.
Traditionally, compressed air cleaning has been the main approach for pipeline drying in China, but there has been a lack of dedicated drying technologies specifically designed for large-diameter, long-distance pipelines. Recognizing this need, China National Engineering Construction Corporation leveraged its core expertise in long-distance pipeline construction. A team of 10 researchers was assembled to form a specialized gas pipeline drying technology research group, aiming to address the diverse requirements of different regions and pipeline types.
The research team conducted extensive market analysis and studied advanced foreign and domestic drying technologies. Through rigorous technical evaluation, data collection, and field measurements, they ultimately developed a non-thermal regeneration drying process. This innovative method uses a combination of alumina and active molecular sieves as desiccants. During project execution, the team overcame several technical challenges, including the design of desiccant proportioning systems, instant vent regeneration processes, and fully automated control systems for components like air coolers and filters.
The solution proved highly effective, meeting the demanding requirements of large-scale pipeline drying while maintaining a dew point of below -40°C. After comprehensive performance testing and acceptance, the non-thermal regeneration dryer demonstrated its ability to meet all necessary criteria—regardless of the dew point of the drying air, equipment process, air discharge, equipment size, or automation level. This advancement significantly reduces risks during construction and plays a vital role in ensuring the success of future pipeline projects.
Currently, the company has filed for national patents to protect this groundbreaking core technology, marking a milestone in China's pipeline engineering sector.
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