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Dominic,

Fluidized bed combustion is used by some power plants as opposed to  
micronized coal firing.  Gasification is different than both.  A  
description of fluidized bed can be found at:  http:// 
en.wikipedia.org/wiki/Fluidized_bed

this type of combustion uses primary air to suspend the coal in air  
to burn it on all sides.

Gasification uses limited primary air to facilitate gasification then  
uses primarily secondary air to burn the resulting gas.  his is well  
described in the paper.

John R.

On Jan 11, 2008, at 7:40 PM, NW Mailing List wrote:


> This sounds like the fluidised bed technology promoted by the  

> (state-owned) National Coal Board in the UK, in the '70s albeit for  

> more efficient power station use (though I think I saw a demo for  

> domestic heating use) see http://www3.interscience.wiley.com/cgi- 

> bin/abstract/114187872/ABSTRACT?CRETRY=1&SRETRY=0 for example.

>

> Some more recent references are at:

>

> http://www.iea-coal.org.uk/content/default.asp?PageId=982

> http://www.worldcoal.org/pages/content/index.asp?PageID=420

> http://www.mininginstitute.org.uk/library/categories/Fluidisation.html

>

> It didn't fly then ....... altho' I believe some form of approach  

> may be used in more modern (or perhaps modernized) power stations.

>

> Best wishes

>

>

> Dominic Pinto

>

>

> NW Mailing List wrote:

>> Ed,

>>

>> Great question.  I don't know if you have read the paper, it is in  

>> there.  But basically the combustion/firebox design gasifies the  

>> coal to a combination of hydrogen, methane and carbon monoxide.   

>> This gas blend is burned completely above the firebed with no  

>> smoke and virtually no particle carryover.  This is the simple  

>> version.  Also coal fired power plants are not belching smoke  

>> anymore either.

> <snip>

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