Furnace body for vertical cracking furnace

The utility model discloses a furnace body for a vertical cracking furnace. The furnace body is made of a high-temperature refractory material and comprises a pyrolysis chamber and a combustion chamber, wherein the pyrolysis chamber is positioned on the upper part of the furnace body; the combustion chamber is positioned on the lower part of the furnace body; a fire grate is arranged between the pyrolysis chamber and the combustion chamber; and a fire grate column body is connected with a rotating device which rotates according to set rotation speed and direction. By adopting a trapezoidal or kettle-shaped combustion chamber, the heat of the combustion chamber is thermally reflected through the inner wall and is more centralized, so that the temperature of the combustion chamber and the working temperature of a combustion region are increased, and the working efficiency of the cracking furnace is increased.