Sludge drying apparatus

A sludge drying apparatus comprising:

• a jacket having a long box shaped structure in which performance of a unidirectional feeding type drying process for sludge introduced into the jacket is allowed;
• an agitation screw configured to make a mixing state of components uniform by agitating the sludge contained in the jacket while being installed in the jacket along a lengthwise direction of the jacket and being revolved such that moisture contained in the sludge is dehydrated after the sludge is moved to one direction while being compressed at the same time;
• a heater configured to remove not only the moisture dehydrated by the agitation screw but also residual moisture left in the sludge according to a heat operation while surrounding side surfaces and a lower side of the jacket;
• and
• a driving device configured to transmit a rotation driving force to the agitation screw while being mounted on one side of the jacket, wherein:
• the jacket has a ‘U’-shaped cross-sectional structure and an interior space for introducing and storing sludge and for installing the agitation screw;
• a plurality of crushing pins that repeatedly crush the sludge that is fed by the agitation screw while being compressed are formed on opposite inner surfaces and a bottom surface of the interior space at a specific interval along a lengthwise direction of the jacket to protrude;
• the agitation screw includes:
• a rotary shaft rotated at a specific RPM by the driving device while crossing the interior space of the jacket in a lengthwise direction of the jacket;
• and
• a blade formed by forming the shaft such that the shaft has a screw thread surface along the lengthwise direction thereof and configured to simultaneously perform agitating, compressing, and feeding of the sludge introduced into the jacket in one direction;
• the blade has cutaway recesses at portions corresponding to protruding locations of the plurality of crushing pins to prevent rotation of the blade from being hampered by the plurality of crushing pins formed on the opposite inner surfaces and the bottom surface of the jacket at the specific interval to protrude;
• and
• the plurality of crushing pins repeatedly crush the sludge in a form of a lump during the process of agitating, compressing, and feeding the sludge by the blade.