[Stoves] Emission testing

[frank]

Dear Dean and other testers;

I am thinking of a different set-up for measuring emissions.
Part One:
A 2" diameter metal pipe with end cap. The  end cap has a metal probe 
that goes into the stack. The other end is machined to hold a glass 
fiber filter (I have ideas) and  a pipe coming out. This way the gas is 
filtered hot so to be able to collect all the tars on the filter before 
they  coat the sides. A pump like the Qubit 
http://www.qubitsystems.com/Merchant2/merchant.mvc? gas pump G100 
followed in-line with a flow regulator followed with the end tube goes 
into the bottom of an open test tube.

Part two:
We start with a six channel peristaltic pump like this: 
http://www.ledebuhr.net/pumps/discrete.channel.php They are mostly used 
for liquid but work very nicely with gas. On the in flow side of the 
pump one tube goes into the final test tube in Part One to pull filtered 
emission gas. The other five tubes go into a tedlar bag filled with 
nitrogen. 
http://www.celscientific.com/TedlarBag.html?gclid=CNuOqMnBxJECFSJZiAodwWtWLQ  

We set up in series flow through detectors starting with an O2 detector 
like the S102, a CO detector like the S129 and a CO2 detector like the 
S151  ( http://www.qubitsystems.com/ ). To get the dilution right for 
the range of the detector one or several of nitrogen pumping tubes can 
be T'ed into the line just before the detector. If necessary a mixing 
tube can follow the T's and before the detector using a test tube and 
two hole stopper. Inflow goes to the bottom and out flow takes gas off 
the top. A wad of glass wool inside helps mixing.  Now we have an 
emission tester.

The multi tube pump can also be used to calibrate the detectors. Have a 
tedlar bag filled with known concentrations of CO, another with O2 and 
another with CO2. For calibrating the CO we start with all the in flow 
tubes in nitrogen to get zero. Then place one tube into the CO bag 
(read) then two tubes into the CO bag (read) then three into the CO bag 
.....  Plot the curve.  The air flow from the tubes can be calibrated 
using water. Place a tube into a weighed beaker filled with water, leave 
running for an hour then weigh and determine how much water was used.

(yet to try)



Frank




-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com