Abstract
To scale up the traditional clay coal kilns as they are for the purpose of carbonizing voluminous driftwoods in reservoirs can be questionable from the viewpoints of the structural stability and durability, because of taking place of cracks, exfoliation and deteriorations caused by high heat expansion and its shrinkage through cyclic heat process. In the paper, numerical studies as to heat transfer, stressstrain and deformation behaviors during carbonization process using a large scale kiln model will be examined in order to refer to the problems and their solutions on the design antecedently. Finally, the large scale OKUTADAMI kiln applied above lessons learnt is constructed and operated satisfactorily
