The actual gasification happens at temperatures above 700 o
C when the glowing coke and
pyrolysis gas are allowed to react with a gasification agent, such as oxygen, air or steam. The
gasification agent is normally injected in small amounts. The coke is gradually broken down into
gases, such as carbon monoxide (CO), carbon dioxide and hydrogen (H2 from the steam reaction)
or nitrogen (N2 if air is used as gasification agent). The gasification can take place in a pile of coke
— a fixed bed — or e.g. in a fluid bed [1].