Patent ID: 8657892
Filing Date: 2014-02-25
Classification: C10J,F23G,Y02P

Abstract:
1. A downdraft gasifier comprising: a pyrolysis and tar cracking section having a perforated inner cylinder for receiving biomass and an outer surrounding cylinder for receiving gases from the biomass, the inner and outer cylinder being in a fixed relationship with respect to one another; a pressurized air supply feeding into an upper region of annular space defined by the inner and outer cylinders imparting a cyclonic movement to gasses escaping an inner chamber defined by the inner wall; a stirrer that stirs biomass material within the pyrolysis and tar cracking section; and a char gasification section for receiving biomass and gases from the pyrolysis and tar cracking section, the char gasification section providing a grating and scraper for passing gases and ash and retaining biomass for char gasification on the grate.