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| | | Forum Newbie
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Last Login: 9/25/2008 9:20:56 AM
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| | I currenlty am running a Groth model 8391B Waste Gas Burner Automatic Ignition & Pilot Control system on my Anaerobic digester system with flows anywhere from 0 to 200 cfm depending upon the feed rate. My question is what is the industry using instead of the propane pilot? There has to be a cheaper and better option to keep my flame lit? This is my first post but I have been watching and learing from this board. There are some very intelligent individuals on here. Thanks in advance for you help. Ben |
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| | | Forum Newbie
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Last Login: 9/25/2008 9:20:56 AM
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| | | Supreme Being
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Last Login: 9/27/2008 11:58:25 AM
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| | Where I used to work it was set up to ignite the gas by a spark plug. We used no pilot flame. Why couldn't you just hook up the line to the gas line from the digesters? |
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| | | Forum Newbie
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Last Login: 9/25/2008 9:20:56 AM
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| | That is what I would like to do but I do not get a high enough gas pressure. Our gas is only at a 3 Inches of water column. I am going to try it after I get a flame arrestor ordered. |
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| | | Supreme Being
Group: Forum Members
Last Login: 9/22/2008 6:07:19 PM
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| What do you use the gas for?
My rough calculations, assuming that the average gas production rate is 100 cfm, 600 btu/cf for the gas, and a natural gas cost of from $1.00 to $1.30 per therm (100,000 btu), shows that you have about $1000/day in heat value. I hope that gas is not all being just flared.
100 ft3/minute x 1440 min./day x 600 btu/ft3 = 86,400,000 btu/day
At a typical natural gas heat content of 1000 btu/ft3, this is the equivalent of:
86,400,000 btu/1000 btu = 86,400 ft3 equivalent per day
One therm = 100,000 btu; 1 therm is approximately 100 ft3 of gas. The typical natural gas cost per therm in Southern California is in the range of $0.90 to $1.30 for industrial customers. Your local cost will probably differ. Propane is probably more expensive.
86,400 ft3/day = 864 therms/day; 864 therms/day x say $1.10/therm = $950/day
Jeff Naumann
(310) 540-0045
FAX (310) 540-0337
http://www.jeffnaumannassociates.com/ |
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| | | Supreme Being
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Last Login: Yesterday @ 2:29:29 PM
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| | KABLOOM! Cough, cough,hak,hak. |
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| | | Supreme Being
Group: Forum Members
Last Login: 9/22/2008 6:07:19 PM
Posts: 303, Visits: 4,085 |
| KABLOOM! Cough, cough,hak,hak.
Jerry .........
Are you choking on my math? Maybe I made a great arithmetic error. One of those embarassing ones, where I'm out by a factor of a thousand.
How's it feel to be out of the flip-flop belt?
Jeff Naumann
(310) 540-0045
FAX (310) 540-0337
http://www.jeffnaumannassociates.com/ |
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| | | Supreme Being
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Last Login: Yesterday @ 2:29:29 PM
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| | Sometimes Paradise can be Hades. Remember what Milton wrote. Looking at a job in the South Pole (not kidding). Anyway, I'm looking for work. "Have settleameter, will travel". |
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| | | Junior Member
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Last Login: 9/23/2008 5:04:17 PM
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| Some of the newer flares have the option of using the digester gas as the pilot source and an electronic ignition (so you're not wasting your potentially valuable gas to run a pilot). I agree that the propane or natural gas pilot option was never a stellar idea since there's plenty of digester gas available...no sense in paying for and piping up something else...but I guess the thinking was that an external source would provide a consistent pilot because if it goes out, you're not flaring but rather venting.
I'd check with the manufacturer to see if they have any recommendations...perhaps a retrofit Digester Gas, electronic ignition pilot? As was suggested, hopefully the energy is being utilized for boilers at least...cogen is preferable these days. Energy is getting expensive enough to justify the added scrubbing, equipment, maintenance, etc. in most cases.
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Supreme Being
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Last Login: 10/3/2008 4:56:27 PM
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| Dang it! That is all we need, Jerry melting the South Pole! By the way, you will still have to work for a private (contract) company down under--no different situation than what you were in the Isles.
E. coli happens!Database Central 
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