[TheForge] Vapor/Gas (Was: Building a propane forge)

Thu Feb 19 17:29:00 2004

There are 3 optical pyrometers now on ebay for  less than $100 each.
Chuck
----- Original Message ----- 
From: "Bruce Freeman" <[email protected]>
To: <[email protected]>
Sent: Thursday, February 19, 2004 8:00 AM
Subject: Re: [TheForge] Vapor/Gas (Was: Building a propane forge)


> Sounds like you need a pyrometer.  A simple pyrometer can be cobbled
> together from a thermocouple (type K or R, IIRC - Check the Omega
> Engineering website or catalog) and a decent quality digital millivolt
> meter (20,000 ohms/volt minimum input impedence).  If you have the
> meter, this is about a $20 expenditure.
> Bruce
> NJ
> 
> >>> [email protected] 2/18/2004 6:30:27 PM >>>
> 
> <snip>
> Here is what I'm getting at; the theoretical limit for propane 
> burning in air is supposed to be F 3600. Previous burners averaged
> about F 2250. My 
> designs haven't been put to any scientific tests (lack of money) but
> they 
> seem to increase NOx. When one of the bigger models is running fully
> heated, I 
> can smell something like ozone. Fuel/air burners put out raised levels
> of NOx 
> between 2800 and 3100 degrees. Above or below that temperature the
> levels fall 
> again. So, we have a possible indication of their temperature range. I
> have 
> also compared them to earlier burners running on MAPP and on Propylene.
> They run 
> a little hotter with propane than the other burners with MAPP or
> Propylene. 
> Again, this indicates a temperature over 2800 degrees. Am I happy? Yes,
> but far 
> from satisfied. Between five and eight hundred degrees are left
> unachieved; We 
> want them. Furthermore, with the EPA breathing down everyone's back,
> NOx will 
> become an issue for even the hobbyist sooner or later. Why wait for the
> dog 
> pack to come howling at our shop doors to "rise above it"?  We
> certainly don't 
> want to go the other way.
> Mikey
> 
> 
> 
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