On August 10, a major breakthrough was announced by Zhongyuan Oilfield Engineering Construction Corporation. The company has successfully developed a specialized drying technology designed for non-thermal regenerative long-distance natural gas pipelines, including key projects such as the West-East Gas Pipeline and Sinopec’s Sichuan-East Gas Pipeline Project, both domestically and internationally. This innovative dry construction method fills a critical gap in China's pipeline drying technology and sets a new benchmark, reaching advanced domestic standards.
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 evident to contractors, project owners, and operators alike. The primary cause of internal pipeline corrosion is moisture—both liquid water and water vapor. Effective pipeline drying directly addresses this issue, ensuring safer and more reliable operations.
Currently, most domestic pipeline drying processes rely on compressed air cleaning methods, which lack the specificity needed for large-diameter, long-distance pipelines. To address this challenge, China National Engineering Construction Corporation leveraged its core expertise in long-distance pipeline construction. A team of 10 researchers was formed to develop a dedicated gas pipeline drying technology tailored to different regions and pipeline types.
The research team conducted extensive market analysis and studied the latest domestic and international technologies. Through detailed technical evaluations, data collection, and field measurements, they ultimately established a non-thermal regeneration drying process. The solution uses a combination of alumina and active molecular sieves as desiccants. During the implementation phase, the team overcame several technical challenges, including the design of desiccant proportioning systems, rapid vent regeneration processes, and fully automated control systems for air coolers and filters.
This approach effectively meets the requirements of large-scale pipeline drying, with the final product dew point maintained below -40°C. After successful performance testing and project acceptance, the non-thermal regeneration dryer proved capable of meeting all necessary conditions, including dry air dew point, equipment process, discharge specifications, system size, and automation levels. It significantly reduces construction risks and plays a crucial role in the success of pipeline drying projects.
To date, the company has applied for national patents for this innovative core technology, marking a significant milestone in China’s pipeline engineering sector.
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