Gasification Compared to Combustion

 

 

 

 

The differences between gasification and combustion are best understood by comparing the chemical reactions involved in each process.

Combustion:

 

Combustion is the total oxidation of carbon, hydrogen and other elements, which releases thermal energy. Combustion is generally less thermally efficient than gasification. As shown by considering th etypical combustion reactions benow, combustion (as carried out in incinerators)  produces higher concentration of pollutant gasses such as SOx and NOx than does gasification

 

Gasification is a much cleaner process than combustion (incineration) for converting carbonaceous materials to energy. In gasification, the fuel is first converted to a clean-burning gas (syngas) at high temperatures. This gas can be used as a clean fuel or converted to chemicals such as ammonia for industrial or agricultural use.

The differences between gasification and combustion are best understood by comparing the chemical reactions involved in each process. As can be seen by comparing the typical combustion and incineration reactions, the levels of SOx and NOx are much reduced by first gasifying the fuels prior to combustion of the syngas product.