Gasification - Important Concepts and Definitions

50 years or so is the production of hydrogen, which is a reagent for the production of ammonia-/urea-based fertilizer. 

As previously mentioned, the products from gasification differ from the products of fast pyrolysis fast pyrolysis produces primarily bio-oil, with some amounts of char and permanent gases. In gasification, die gases (CO and H2) are the major products, with some char and tar produced. Tar is similar to bio-oil, but it is more viscous. 

The oxygen used in gasification systems typically originates from air. Air is not, however, the only oxidant environment used in gasification. Pure oxygen and steam are used as well. The choice of gasifying agent depends heavily on the application and will be discussed later in the text. 

Two other important concepts related to gasification are the carbon conversion (Cconv) and cold gas efficiency (CGE). Their definitions are  

The carbon conversion Cconv is a quantity related to the mass balance. It expresses how much of the carbon present in the original solid ends up in the product gas. The carbon conversion is a strong function of the system, but it can be as high as 98-99% for some gasifiers. 

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