Regarding the Post of Pete and Sheri below: > Message: 16 > Date: Mon, 4 Feb 2013 13:11:17 -0600 > From: "Pete & Sheri" <[email protected]> > To: "'Discussion of biomass pyrolysis and gasification'" > <[email protected]> > Subject: Re: [Gasification] mycoremediation of tarry water > Message-ID: <001d01ce030b$69202140$3b6063c0$@net> > Content-Type: text/plain; charset="us-ascii" >
Note on inexpensive CH4, CO and other combustible gases. Most likely, these gas sensors operate on the electrochemical basis. If you want to monitor these gases in producer gas, it wont work. You will need properly calibrated IR or NIR (near infrared) sensors. Very expensive. And yes, that flow regulator for the cal gases is expensive. Electrochemical sensors "combust" the gases. You need air, close to what we have in fresh air. Moreover, CO sensors are thrown off by H2, which you have quite a bit in producer gas. In biogas systems, CH4 and CO2 gas analysers ( IR and NIR basis) retail at about 10k$ US. Portable units maybe a bit less. The gas needs to be dried a bit, otherwise need special cooler/filter. I think moisture will throw off one or both of the measurements. I'm shopping for a Testo or a Bachrach right now for a wood boiler demonstration. A continuous measurement unit is also around 10-13 k$ US for O2, CO2, CO, flue gas temp, delta P and some other parameters. I'll also need a pitot tube for flow rate in the chimney pipe if we want emission values. Cheers, Terrence
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