[Gasification] water gas and IC Engine exhaust gas tempretures

[Kevin Chisholm]

Dear Ken

There is a very comprehensive article at
http://www.enme.umd.edu/ice_lab/lab/stoves.html

on control of blast furnace stoves.... it illustrates quite well what you 
were indicating.

Best wishes,

Kevin
----- Original Message ----- 
From: "Ken Boak" <kenboak at stirlingservice.freeserve.co.uk>
To: <GASIFICATION at LISTSERV.REPP.ORG>
Sent: Thursday, November 23, 2006 3:15 AM
Subject: Re: [Gasification] water gas and IC Engine exhaust gas tempretures


> Dan, Jeff, Jonathan and List,
>
> Extracting heat from the coolant circuit using a water to air radiator 
> will
> only result in air temperatures somewhat below 100 C  (212 F).
>
> Greater temperatures could be achieved using an air preheater that 
> surrounds
> the exhaust manifold.   Temperatures of 300 C are available there - but 
> gas
> to gas heat exchangers tend to be bulky and not easy to construct.
>
> Why not take a tip from Reverend Robert Stirling's notebook, and build an
> economiser, or regenerator?  The device was used for pre-heating the air 
> for
> blast furnaces, and run in a batch mode.
>
> In one embodiment it would be a stack of high density magnetite bricks - 
> the
> kind that are used in electric "night" storage heaters.
>
> A  7.5 kg brick can typically store  0.75kWh of heat energy, easily at
> temperatures up to 600 C.
>
> The hot engine exhaust is passed through a stack of bricks contained in an
> insulated box, for several hours, to heat them up. The exhaust is then
> diverted to a second box, and the process continues.  Air for the gasifier
> is then drawn through the first box, giving it considerable preheat.  Any
> soot in the exhaust that remains in the box, will eventually find its way
> into the gasifier and be consumed.
>
> The same approach could be used to make use of the heat contained in the 
> hot
> raw gas from the gasifier.  Does anyone have a typical temperature  range 
> of
> the gas drawn out of the grate?
>
> Ken
>
>
>
>
>
>
>
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