Cross Draft Gasification

Cross draft gasification is one of the simplest types of gasification; the reactor for this gasification is much like the updraft gasifier in that the fuel will enter from the top and the thermochemical reaction will occur progressively as this fuel descends into the reactor. The crucial difference is that the air will be entering the gasifier from the side of the reactor, rather than from the top or the bottom. The start-up time for this reactor is relatively short, and high temperatures can be attained using this type of gasification. Cross draft gasification isn’t seen very often in commercial processes mainly because other gasification methods offer more flexibility with respect to fuel types; this type of gasification doesn’t handle fuel that has a high tar content and bridging can be a consequence of the particle size of the fuel.

Flow Diagrams

cdgas1
(Source: http://www.gasifyer.com/cross_draft_gasifier.htm)
 

cdgas2
(Source: http://www.soi.wide.ad.jp/class/20070041/slides/04/index_40.html)
 

cdgas3
(Source: http://www.sciencedirect.com/science/article/pii/S0378382010000305)
 

Equipment

Flare
Fire Port
Blower
Hearth
Hopper

 

Videos

Gasification: The Waste-to-Energy Solution

 

References

  1. http://www.gasifyer.com/cross_draft_gasifier.htm
  2. http://www.gasifyer.com/cross_draft_gasifier.htm
  3. http://www.sciencedirect.com/science/article/pii/S0378382010000305
  4. http://www.gasifyer.com/cross_draft_gasifier.htm
  5. http://www.altenergymag.com/emagazine.php?issue_number=09.06.01&article=zafar
  6. http://www.youtube.com/watch?v=bPRa31dS0vA

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