Effect of Temperature and Pressure on Release Characteristics of Ash Components in the Coal Gasifier

抄録

It is important to clarify the release characteristics of ash components and condensing behavior of released components in a high pressure reducing atomosphere, because these behaviors affect coal ash properties and change the slagging and fouling characteristics in gasifier. 3 brands of pulverized coal were burnt following JIS (Japanese Industrial Standards) regulation to form ash samples, and prepared ash was exposed to a hydrogen/argon mixture reducing gas (hydrogen 3%) at temperature ranging from 600°C to 1460°C for about 2 hours in electric tube furnaces at an atmospheric pressure and pressure of 900 kPa. By analyzing the composition of each sample by XRF, release characteristics of each component was clarified. To obtain referrring data, CCSEM analysis was performed. In this paper, the changes in ash compositon at the temperature in the reductor of a gasifier were quantified. The effect of coal brand and pressure on ash composition was found to be remarkable.