Two-stage continuous biomass pyrolysis plant and method thereof

The invention belongs to the technical field of biomass energy heat conversion utilization and in particular relates to a two-stage continuous biomass pyrolysis plant and a method thereof. The two-stage continuous biomass pyrolysis plant comprises a pyrolysis plant, wherein the pyrolysis plant comprises a roller, a feeding hole and a discharging hole; thermal insulation layers are uniformly laid in inner walls of the roller; the roller is divided into a low-temperature stage and a high-temperature stage; a first cylinder is arranged in the thermal insulation layer of the low-temperature stagein a sleeving manner; a biomass channel is formed in the thermal insulation layer of the high-temperature stage; the biomass channel is a circular channel encircled by multiple flue gas tubes; one ends of the flue gas tubes are fixed by fixing plates; the fixing plates are connected with inner side walls of the thermal insulation layers; high-temperature flue gas inlets through which high-temperature flue gas is introduce