[Gasification] Has anyone read "Combustion and Gasification in Fluidized Beds"?

[Daniel Chisholm]

On Thu, 2007-17-05 at 10:04 -0300, Daniel Chisholm wrote:
> library didn't have "Combustion and Gasification in Fluidized
> Beds" [...snip...] I've got it on order from Amazon.ca, with a 4-6
> week delivery time

Well it looks like "4-6 weeks" quoted must have been in Internet Time,
the book arrived last night.  It is a nice surprise when things are
earlier than expected, eh?

I've only had a quick look through it so far, but so far so good.  The
table of contents is very promising (and available for free on
Amazon.com, BTW).  I was reading the section on cyclones last night, and
was pleased and impressed with the design details and examples that were
given (real life diameters, entrance velocities, particle cut sizes
etc).  And also very impressed by just how *large* cyclones are for
multi hundred MW CFBs (they are comparable in volume to the main boiler
chamber).  Some interesting comments too about how these huge (as in,
*7m* in diameter!) cyclones actually work better than expected, given
that cyclone effectiveness scales downward as a function of increasing
diameter (it was offered that the extremely high particle loading
actually makes the separation task easier and more efficient).  Some
interesting cyclone designs too, e.g. bottom-exit, horizontal-exit, and
also square or rectangular cross section ones too  (believe it or not!).

There is a whole chapter on gasification in CFBs, which I am looking
forward to reading next; all the FB and CFB stuff I have been reading
about so far (the 10-30 year stuff) has been oriented towards combustors
and not gasifiers.  And a very promising chapter on materials.  I am
hoping to find useful information related to materials considerations in
the reducing conditions of a gasifier.

There is also a fair bit of the content oriented towards biomass feeds
(all the older stuff I've been reading has been coal oriented).  This is
what interests me for my application.  I do get the feeling that the
sexy use of CFBs today is biomass gasification, whereas 15-30 years ago
it was clean coal combustion.

So, this isn't a book review or anything, but like I said, so far so
good...!


-- 
- Daniel
Fredericton, NB  Canada