No.20 高含水率低品位炭の燃焼特性に関する基礎研究(熱分解・コークス(5)、ガス化・燃焼・液化(1))

抄録

The effect of inherent moisture on pyrolysis and combustion behavior of typical Chinese coals from low rank to high rank coals was investigated. A drop tube furnace was used to generate chars and fly ashes from both wet and dry coals. The moisture contents of the wet low rank coals entering the reactor were 23.4 and 28.8 wt%, respectively. There were some differences observed between the morphology of char during pyrolysis of the low rank coals. The surface area of char from the wet low rank coal was higher than that from the dry coal. In addition PM_<0.1-10> (particles with the aerodynamic diameter ranging from 0.1 μm to 10μm) generated by the wet low rank coal was increased comparing with that by the dry coal. Rapid vaporization of the inherent moisture in wet low rank coal was considered to cause the structure change of char and the emission of fine included minerals from coal during pyrolysis.