ABSTRACT
Gasification and pyrolysis are both aspects of thermal processes that are involved in combustion. Gasification and pyrolysis are both aspects of thermal processes that are involved in combustion. On a practical basis, gasification is normally carried out in a higher temperature region than pyrolysis. Gasification of a fuel involves a complex sequence of reactions that are determined and controlled by design of the process. Given sufficiently high temperatures and sufficient quantities of oxidizing agents, the products of gasification are essentially hydrogen, water, carbon monoxide, carbon dioxide, and methane. The rates of reaction in gasification are highly temperature dependent. The presence of metallic salts has profound effects upon the reactions taking place in the thermal degradation of the fuel, and plays a role in gasification. Carry-over of fuel introduces an element of cocurrent suspension design. A fluidized-bed design is obtained using a countercurrent flow of gas and particulate material.
