Biomass carbonization and gasification coupling system and process with low pollution emission

The invention discloses a low-pollution-emission biomass carbonization and gasification coupling system and process, relates to the technical field of biomass resources, and aims to solve the problem of developing a system capable of efficiently utilizing the biomass resources and achieving low pollution emission.The low-pollution-emission biomass carbonization and gasification coupling system comprises a feeding device, the output end of the feeding device is connected with a coupling device, the coupling device is communicated with a storage device and a collection box, the storage device is used for collecting gasified synthesis gas, the collection box is used for collecting wood vinegar and wood tar, the output end of the coupling device is connected with a gasification furnace, and the output end of the gasification furnace is connected with a heating device. A steam inlet of the gasification furnace is communicated with the coupling device through a steam pipeline, and a gasification outlet of the gasif