System for implementing biomass pyrolysis method and method

The invention discloses a system for implementing a biomass pyrolysis method and the method. The system comprises a nitrogen device, a pyrolytic device, a dust separation device, direct cooling devices, an indirect cooling device, a filtering device and a gas storage device, wherein the pyrolytic device is connected with the nitrogen device; the dust separation device is connected with the pyrolytic device; the direct cooling devices are connected with the pyrolytic device; the indirect cooling device is connected respectively with the direct cooling devices; the filtering device is connectedwith the indirect cooling device; the gas storage device is connected with the filtering device. Therefore, a physical cooling method is adopted to reduce the content of tar and impurities in pyrolytic gas, not only can requirements on deep purification be achieved, but also the problem of extremely high operating cost caused by a chemical method can be avoided. Moreover, by adopting a graded cooling and purifying system,