There is a difference between pyrolysis and gasification. In pyrolysis, the volatile component of an organic substance is thermally decomposed at a temperature between 200-760 degree Celsius. The process takes place in the absence of air/oxygen and syngas is formed.
In Pyrolysis, indirect heat is used. The residual parts include un-reacted carbon char and ash.
In Gasification, thermal decomposition of volatile matter and non-volatile carbon char takes place at high temperature between 480 - 1650 degree Celsius. The carbon char which remains as residue in the Pyrolysis process is converted into additional syngas in the gasification process.
In Gasification, heat is passed directly. A fraction of oxygen is used and the residual part include ash only.
Though the process is different, CASE Group in India has introduced Pyrolysis Gasification technology. Accordingly, coal is carbonized at low temperature in the pyrolysis section and the tar produced is of low viscosity and high fluidity. As a result, tar does not get clogged in the duct before purifying equipment.
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