Steam reforming process with low carbon dioxide emission

A steam reforming process for producing synthesis gas from hydrocarbons, comprising: a first steam reforming step in which a gas stream of a hydrocarbon feedstock is supplied to a first reforming section (51) comprising at least a first gas-heated reformer in which a steam reforming reaction takes place, forming a partially reformed effluent; a second steam reforming effluent, in which the partially reformed effluent exiting the first reforming section (51) is supplied to a second steam reforming section (52) comprising at least one second reformer, in which air combustion takes place in the radiant chamber outside the tube; the second reformer is a gas heated reformer. 一种由烃生产合成气的蒸汽重整工艺，包括：第一蒸汽重整步骤，其中将烃原料的气流供应到包含至少第一气体加热重整器的第一重整段(51)，在其中发生蒸汽重整反应，形成部分地重整的流出物；第二蒸汽重整流出物，其中离开第一重整段(51)的部分地重整的流出物被供应到包括至少一个第二重整器的第二蒸汽重整段(52)，其中在管外的辐射室中发生空气燃烧；第二重整器是气体加热重整器。