โ Scribed by Girard A. Simons
No coin nor oath required. For personal study only.
A theory of pore evolution in nonswelling coal is presented which describes the development of the pore structure during pyrolysis. The pore evolution theory treats the rate of increase of porosity (dO~dO as a bulk kinetic parameter and identifies the corresponding rate of growth of each pore in the pore structure. Variations in the final pore structure do result from different pore evolution mechanisms, and the potential mechanisms which yield higher reactivity chars are identified. It is shown that a statistical approach to pore evolution is sufficient to describe the pore structure and to identify the rate of volatile release in any pore. The volatile release rate in each pore is critical to the development of the species transport model in Part II.
๐ SIMILAR VOLUMES
09 Combustion (burners, combustion systems) higher laser input has the same effect. It is also shown that the sustained combustion temperature rises and the combustion period decreases with a higher oxygen content.
Volatile transport during pyrolysis is described. Volatiles are generated at the walls of the pores and are transported through the pore tree via both diffusion and convection. The model is parametric in the intrinsic pyrolysis rate k and suggests that for k in excess of I s -1,100-~m-diameter parti
Five Czech coals of different rank (70.2, 71.5, 74.5, 75.0 and 83.3 wtT$, carbon) were heated at different temperatures in the range 25&85o"C and the contents of oxygen-containing functional groups (-OH, -COOH, =CO, -OCH,) were determined in the coals and carbonization residues. The coals and residu