Emission reduction practice of using mobile compressor units in the blowdown recovery process of long-distance natural gas pipelines

To reduce direct natural gas emissions and address global climate change, this study explores the innovative application of mobile compressor units in the blowdown recovery process of long-distance natural gas pipelines. The integration of each unit component is optimized using a modular design approach, while advanced automatic control systems enable fully automated monitoring. Leveraging a "building block" concept with prefabricated, multi-specification pipeline segment flanges and on-site assembly, the study details the practical application of mobile compressor units in the blowdown recovery process of long-distance natural gas pipelines, including site layout, pipeline connections, unit configuration, and system design. Field maintenance and repair operations confirm that the developed mobile compressor unit achieves a recovery rate exceeding 75% during blowdown recovery at 3^# Valve Chamber of the Changqing-Yinchuan Pipeline, effectively conserving natural gas, reducing carbon emissions, and supporting green, low-carbon development.