Research progress on batch transportation technology of liquid ammonia/methanol/product oil

With the continuous promotion of energy revolution and energy transition, the product oil consumption in China will peak, and the trend of low delivery volume of product oil pipelines becomes evident increasingly, which puts enormous pressure on product oil pipeline companies. At the same time, as the "ammonia-hydrogen" green energy and "liquid sunshine" carbon neutralization technical routes are hotly promoted, and the related industries are developed vigorously, the production of liquid ammonia and methanol is bound to grow massively in the future. Therefore, a technical route for the large-scale batch transportation of liquid ammonia, methanol and other liquid new energy through the existing product oil pipeline systems was proposed, aiming to help the product oil pipeline companies create new growth poles. The batch transportation technology of liquid ammonia/methanol in product oil pipelines was systematically overviewed. Besides, five major technical challenges, including the hydraulic and thermal characteristics in batch transportation, prediction of mixed oil development, batch establishment and mixed oil cutting and treatment, applicability of pipeline materials and equipment, and leakage diffusion and safety protection, were elaborated. This could provide reasonable suggestions and reference directions for the field application of the batch transportation technology of liquid ammonia/methanol/product oil.