The invention relates to a drum vacuum dryer, which comprises a
drum drying container, a
discharge device, a vacuum unit, an
elbow, a bracket, a support wheel bracket, a guide
pipe, a gear ring, a driving device, a sealing device and a hopper; the
drum drying container includes a heating container, a cooling container, a preheating container, a
drying container, a sealing device and a
heat conducting medium. The material inlet and outlet of the
elbow and the
drying container are connected by the dynamic seal fixed by the sealing device. One end of the
discharge device is fixedly connected to the
flange of the
elbow, and the other end of the
discharge device is provided with the hopper. One end of the guide
pipe is connected to the vacuum unit and the other end extends through the elbow tothe inside of the
drying container. The gear ring drives the drying container to rotate on the bracket of the support wheel bracket. The
heat energy heats and conducts the material through the
heat conducting medium, the heat conversion has the advantages of high efficiency and small loss, thereby improving the material drying speed. After drying, the material is cooled in the cooling section, andthe
heat energy released when the material is cooled is capable of being re-utilized. When a
heat pipe is damaged and leakage occurs, the use of the whole drum vacuum dryer with cooling section wouldnot be affected.