The present invention relates to obtain syngas and its by products from coal, domestic wastes, sludge, and all other combustible wastes by fast pyrolysis at high temperature. Screw shaped thin structure is welded on outside wall of outer reactor tube as well as inside wall of inner reactor tube in order to enhance heat exchange of the reactor. The inner reactor tube rotates while outer reactor tube is stationary. High temperature fire flowed through inner reactor tube as start, after fire moved out from that, the fire flow makes U turn and flow back through outer annulus of the pyrolysis reactor. Therefore, substantiality of this new invention, that the heat is homogeneously transferred 360° of the device. In other words, annular pyrolysis reactor heated from inside in beginning and then from outside. Furthermore, a flexible screw is fixed on outer wall of reactor tube, which pushes feeding material along the reactor tube. Pyrolysis reactor body has ceramic wool insulator to keep high temperature in reactor. Annular reactor is placed inside the reactor body and annulus profile is created between them. In result, advantage of this invented device is annular reactor is heated from all side and heat energy is used very efficiently.