Optimization of the construction scheme for coal-based synthetic natural gas export pipelines

Objective Under the strategic goals of "carbon peaking and carbon neutrality", the diversification of natural gas supply and increasing degree of dependence on import present new opportunities for coal-based synthetic natural gas (SNG) development. However, challenges remain, including limited competitiveness in the resource terminal market and environmental issues such as high carbon emissions. A thorough evaluation of the coal-based SNG industry's development potential and the formulation of effective construction schemes for export pipelines will facilitate the advancement of a modern oil and gas infrastructure system. Methods An in-depth analysis of the current state of coalbased SNG industry construction clarified future development trends and comprehensively assessed industry opportunities and market challenges. Based on resource uncertainty analysis, an optimization method for the phased construction of coal-based SNG export pipelines was proposed. Guided by national and regional policy requirements, various export scenarios were identified based on resource implementation. Methods such as expanding pipeline diameter, increasing compressor stations, and constructing dual pipelines were adopted individually or in combination, leading to the development of a comprehensive construction scheme for coal-based SNG export pipelines that accommodated diverse resource scenarios. Results The effectiveness of the optimization method was validated through engineering examples, offering a novel design approach for export pipelines facing similar resource uncertainties. This method effectively reduces the one-time pipeline investment costs and significantly contributes to optimizing the natural gas pipeline network from a supply chain perspective. Conclusion It is recommended to leverage the strengths of resource supply producers, pipeline network operators, distributors, and end users within a fair and open pipeline network operation mechanism.This approach will establish a continuous and stable supply-demand pattern for the coal-based SNG supply chain, improve the efficiency of resource upload pipelines, and enhance the risk manage ment and control capabilities of the pipeline network.