RE: FW: GAS-L: Drying

[Peter Singfield <snkm@btl.net>]

Hi Andries:

>Lots of fly ash and lots of water and high temperature 
>makes for.....yes, a mess, and hard to clean out.

Check out cascading, vacuum distillation -- right in your area -- France.

www.entropie.com\En\default2.htm

Browse around.

Certainly beats "membrane" technology -- and especially when you have a
little bit of waste heat at hand.

Do not have to "de-gas" -- and can handle resulting sludge well.

You'll have some mental gymnastics figuring these style systems out -- but
very enlightening when you do -- and many other applications here as well
-- such as drying extremely wet fuels (say sewage sludge??) and ending up
with potable water -- and dry fuel.

Many people ignore the "dirty" water question in press drying -- as in --
what to do with that effluence.

Peter/Belize


At 06:56 PM 2/18/2001 +0100, you wrote:
>Hi Peter,
>
>> Peter Singfield[SMTP:snkm@btl.net]
>> 15 februari 2001 16:47
>> 
>> I propose a simple economizer (vertical fire tube boiler style) in the
>> "stack" through which refrigerant (prefer butane) is circulated. Then
>> energy is extracted by rankine cycle after. The flu gas exhausting in this
>> method of operation would be brought down to well below 160 F.
>> 
>> The response was that "clients" are only interested in proven technology.
>> And I know that is a fact of life. so there you go. 
>> 
>> We are only allowed to fine tune what we have at present -- even putting
>> an
>> economizer in the stack is considered to "radical".
>> 
>Considered too radical by whom?
>It is being done in Germany as I mentioned in my posting of 15 februari 2001
>1:09
>quote
>At the moment in Germany a new 900 MWe lignite plant is being build with
>flue gas recuperation htex built from engineering plastic materials. 
>unquote
>
>> But yes -- it certainly would appear the solution to "wet" fuel burning
>> would lay in this direction of endeavor.
>> 
>Or accept that wet fuel is not suited.
>
>Just to mention some other "radical" idea in the same hot-but-wet flue gas
>area:
>we are preparing a test to produce distilled water from the stack of a PC
>plant by way of membrane technology. This is after desulpherisation. Reason
>is that this particular plant has only sea water close by and no fresh
>water. Fresh water for boiler make up needs to be piped in over 60 miles at
>an considerable expense. Next to a lake, river or canal it wouldn't pay of
>course.
>
>This would not be the ultimate solution to cofiring wet biomass, though,
>because the practical bottleneck (apart from efficiency motives) is in the
>upstream area (before the water is taken out) of regenerative
>fluegas-to-combustion air heat exchange and in the ESP. Lots of fly ash and
>lots of water and high temperature makes for.....yes, a mess, and hard to
>clean out.
>
>Andries
>
>
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