Wandoan char

Earlier work in this laboratory has shown that combustion of chars of low and high-rank coals occurs under regime II conditions ( ), l e under circumstances where pore diffusion as well as chemical reaction exercises marked rate control Hie values of the activation energy for the Millmerran and Wandoan chars 20... 

Figure 5. Combustion behavior of Millmerran and Wandoan chars.

The chars were produced in a process development unit scale fluidized-bed flash pyrolyser (90 from pulverized Mlllmerran and Wandoan subbituminous coals from Queensland, Australia. Mlllmerran coal was pyrolyzed at various temperatures between 500 and 800 C and Wandoan coal at 550°C. The resulting chars were screened to yield a size fraction with a median mass size around 80 pm. Hie properties of the chars are presented in Table I. 

The most reactive char is that produced from Wandoan coal at 550 C,... 

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