Char structures for three coals combusted in a CFB.

摘要

Structural changes from coal to bag filter ash have been studied for three coals combusted in a 2.5 MW CFB. This project have been carried out in cooperation with STUDSVIK Energy. The samples have been produced in a 2.5 MW CFB under typical operation conditions. Investigated coals: anthracite, bituminous coal, subbituminous coal. Coal rank as R(sub m) was found to be a very important parameter for the type of char formed and the combustion efficiency. Macerals behaved in different ways depending on the coal rank and structure. In the anthracite the fusinite was much more reactive than vitrinite. Also in the bituminous coal the fusinite broke down faster than the vitrinite derived coke. In all coals large massive compact inertinite grains were less reactive than vitrinite. (26 refs.).