Sludge pyrolyzing furnace

The utility model provides a sludge pyrolyzing furnace. A water vapor circulating structure is arranged in the sludge pyrolyzing furnace; the water vapor circulating structure comprises a water vaporcirculating pipe and a water vapor circulating pipe, the device comprises a closed microwave pyrolyzing furnace, a water storage tank, a cooling cavity, a water vapor guide pipe, a cooling water guidepipe and an electric control unit, wherein the microwave pyrolyzing furnace is connected with the water storage tank through a water vapor guide pipe; the water storage tank is connected with the cooling cavity through a cooling water guide pipe, water vapor generated in the sludge pyrolysis process is transmitted into the water storage tank through the pyrolysis furnace, liquid obtained after the water vapor is liquefied is pumped into the cooling cavity through the water storage tank under the control of the electric control unit, and therefore internal water circulation is achieved, and water resources are saved. 本