Abstract: Fuel life cycle can be divided into production phase (Well-to-tank, WTT) and vehicle operation (Tank-to-wheel, TTW) phase. In corroding to analysis of energy consumption and emissions for hydrogen production by steam reforming with natural gas during stage of steam reforming, compression, liquefaction and transportation, hydrogen production by steam reforming with natural gas is divided into 12 kinds of hydrogen production mode according to different states of hydrogen (gaseous or liquid) and methods of transportation (pipelines, roads, rail transport). Using energy conservation or conversion principle and the energy consumption and emission factors for device of process fuel, primary energy consumption and emissions are researched for consumption of raw materials and processes fuel while hydrogen produced with natural gas. Without considering laying of transportation pipeline of hydrogen, analyses shows that primary energy consumption of hydrogen production with natural gas are 1.318 78 MJ•MJ–1、1.326 93 MJ•MJ–1、1.557 95 MJ•MJ–1、1.557 44 MJ•MJ–1、1.746 18 MJ•MJ–1from low to high in turn, corresponds to hydrogen production mode of 6、1、3、5、12. Greenhouse gas emissions from less to more than order are 156.18 g•MJ–1、162.11 g•MJ–1、163.37 g•MJ–1、168.53 g•MJ–1、176.01 g•MJ-1, corresponds to hydrogen production mode of 6、12、3、5、2. With the increase of hydrogen consumption, using hydrogen production mode of 6 (NG pipeline transport - H2 production by steam reforming with natural gas centralized in factory-H2 pipeline transportation - gas station compression - sales) can reduce energy consumption and emissions.

Key words: Emissions, Energy consumption, Hydrogen produced with natural gas, Steam reforming