Effect of temperature and pressure on release characteristics of ash components in the coal gasifier

It is important to clarify the release characteristics of ash components an d condensing behavior of released components in a high pressure reducing at mosphere, because these behaviors affect coal ash properties and change the slagging and fouling characteristics in gasifier. 3 brands of pulverized c oal 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 degrees C to 1 4 60 degrees C for about 2 hours in electric tube furnaces at an atmospheric pressure and pressure of 900 kPa. By analyzing the composition of each samp le by XRF, release characteristics of each component was clarified. To obta in referring data, CCSEM analysis was performed. In this paper, the changes in ash composition at the temperature in the reductor of a gasifier were q uantified. The effect of coal brand and pressure on ash composition was fou nd to be remarkable.