DEVELOPMENT OF TENSILE TEST METHOD FOR HI GH-DENSITY COAL UNDER CARBONIZATION

A new tensile test method under carbonization for high-density coal th at would be used in coke making process in next century was developed to estimate the appearance mechanism of coke strength. This method can clarify the appearance mechanism of coke strength under carbonization . We obtained the result that the tensile strength and Young's modulus become large in proportion to the final temperature. In case of large heating rate, the tensile strength and Young's modulus were large. Fr om the microscope observation, coal particles agglomerated to each oth er among the softening temperature and the strength increased with an increase of heating rate. We also estimated factors related with the a ppearance mechanism of the strength using a coal pyrolytic model, whic h was previously developed by authors. The results showed that the lar ge strength is caused by the progress of coke graphitization and an in crease of internal tar contributing to sticking on each particle.