F22B1/00—Methods of steam generation characterised by form of heating method
F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
Method for starting a steam generator comprising a heating gas channel that can be traversed in an approximately horizontal heating gas direction and a steam generator