Patent ID: 8141501

Claim:
A wet sludge disposal facility for directly incinerating wet sludge in a cement clinker manufacturing facility which has a preheater for preheating a cement raw material, and a dry process kiln connected to the preheater at a kiln inlet part of the dry process kiln and configured to calcine the preheated cement raw material, the wet sludge disposal facility comprising: a sludge tank configured to store the wet sludge; a pressure feed pump configured to pressure-feed the sludge in the sludge tank; a pipe connected to the discharge side of the pressure feed pump and configured to directly charge the wet sludge into a lower part of the preheater; and a plurality of water injection apparatuses provided to the pipe for intermittently or continuously feeding water between the wet sludge and the inner wall surface of the pipe, wherein the water injection apparatuses are provided respectively at a middle portion between the pressure feeding pump and the lower part of the preheater and at a rising part leading to the kiln inlet part of the pipe, wherein each of the water injection apparatuses includes (i) a water injector, (ii) a water feed pump, (iii) a pressure detector disposed upstream of the water injector for detecting the pressure in the pipe, and (iv) a control apparatus which starts the water feed pump when the pressure detected by the pressure detector reaches a first set value and stops the water feed pump when the pressure detected by the pressure detector reaches a second set value, the first set value being higher than the second set value;; wherein the first value and the second set value of the control apparatus of the water injection apparatus on the downstream side of the pipe are set lower than the first set value and the second set value of the control apparatus of the water injection apparatus on the upstream side of the pipe.