気流層ガス化法の石炭転換効率に及ぼす酸素量および温度の影響

Abstract

Pulverized coal was gasified in the presence of oxygen in an electric-ally-heated entrainedtype reactor to determine optimum gasification conditions. Carbon conversion, product gas yield and properties of char were monitored as oxygen-coal ratio (2) and temperature were varied individually.At constant temperature, the carbon conversion increased monotonically with λ0, but the yield of H2 and CO produced by char gasification first increased to a maximum value, and then decreased since more carbon was burned with oxygen and less was gasified with H2O and CO2. For fixed oxygen-coal ratio, the carbon conversion and the production rate of H2 and CO increased initially with reaction temperature, then leveled-off or decleined as the porosity and the surface area of char decreased. The temperature at which these maxima were detected appeared to be related to the ash melting point.From the results of these experiments, it was concluded that processes operating at a high value of oxygen-coal ratio and a low value of oxygencoal ratio in a different zone in a reactor which enable the suitable temperature for char gasification must be considered so that both high carbon conversion and the high production rate of H2 and CO are attained in entrainment gasification.