For use as a transportation fuel, liquefaction is limited by practical difficulties and compression requires high pressure and an expensive multi-stage compression facility.
对于车用而言，液化方法实用性有限而压缩天然气需要高压及昂贵的多级压缩设施。
2
Test result showed that combustion of Shenhua coal liquefaction residuals proceeds in two stages a low and a high temperature stage.