Gasification system, deicing device thereof and gas supply method

The invention provides a gasification system, a deicing device thereof and a gas supply method. The gasification system comprises two air temperature gasifiers which are arranged in parallel. The deicing device comprises two deicing assemblies which are arranged in parallel, and the two deicing assemblies are arranged corresponding to the two air temperature gasifiers; each deicing assembly comprises a liquid phase pipeline, an electric valve, a bypass pipeline and a bypass valve. The liquid phase pipeline is arranged on the upstream of the air temperature vaporizer and used for conveying a liquid phase medium to the air temperature vaporizer; the electric valve is arranged on the liquid phase pipeline; the bypass pipeline and the liquid phase pipeline are arranged in parallel; the bypass valve is arranged on the liquid phase pipeline; the bypass valve is in a closed state when the electric valve is opened; in the two deicing assemblies, the electric valve of any deicing assembly is opened, the bypass valve i