The volatile matter (VM) comprises a number of hydrocarbons, which are released in steps Since the volatiles flow out of the solid through the pores, external oxygen cannot penetrate into the particle, hence the devolatilization is referred to as the pyrolysis stage lignites up to 40 % Upon entry into the gas stream, heat is convected and radiated to the particle surface and conducted into the particle The drying time of a small pulverized particle is the time required to heat up the particle to the vaporization point and drive off the water DEVOLATILIZATION When the drying of a solid fuel particle is complete, the temperature rises and the solid fuel begins to decompose Devolatilization or pyrolysis is the process where a wide range of gaseous products are released through the decomposition of fuel.
The combustible material generally constitutes water e.g.
2 Combustion of Coal When a solid fuel particle is exposed to a hot gas flowing stream it undergoes three stages of mass loss Drying Devolatilization Char combustion The relative significance of these three is indicated by proximate analysis of coalģ Combustion of Coal Drying DEVOLATILIZATION
0 kommentar(er)
