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a31ford (Computer) (OP)
5 Mar 03 0:01
Hello All, I have another post this forum, BUT...

In the world of "Petrol" eg: gas motor, the fuel to air ratio is what, 1 to 17 or something like that ?

I'm wondering, If anyone knows, what is the ratio for producer (wood) gas ? is it the same ?

Our sons fair project has had a spin off (our "new"  outdoor water heater) and now I'm getting to the point in this "new project" of actually tring to get the most out of the wood we burn (gasification)

I've hunted the web, and to no avail, have I been able to find an answer....

G :)
owg (Chemical)
5 Mar 03 7:42
There is a page in the Chemical Engineer's Handbook (Perry) which lists the stoichiometric requirements for combusion for a range of fuels. It is in the Combustion section. My copy is at the office and I am snowed in at home - tough break. Can someone look it up and post the answers. If gasoline is not listed octane might be a good approximation.

HAZOP at www.curryhydrocarbons.ca

a31ford (Computer) (OP)
5 Mar 03 9:09
OMG ! snowed in ?? No Problem here, (Manitoba) it's the heat we would like :)

Thanks for the Info. owg, hoping someone posts it, as I don't have a copy of that book....

G :)
owg (Chemical)
10 Mar 03 10:17
Producer Gas (Coke oven Gas) need 6.66-7.02 pounds of air per 10,000 BTU of gas for combustion with zero excess air.
Gasoline needs about 15.3 pounds of air per pound of combustible with zero excess air. The gross or high heating value of gasoline is around 19,400 BTU per pound. I don't have a heat of combustion for producer gas but it is a mixture of CO and N2. You will need to do some conversions but its a project isn't it. Good luck. Also actual air will be a few percent over theoretical or zero excess air.

HAZOP at www.curryhydrocarbons.ca

owg (Chemical)
10 Mar 03 11:31
The heat of combustion of producer gas is in the range 125-150 BTU per cubic foot. Since there is virtually no hydrogen in it, there is no water of combution so gross heating value is the same as net heating value.

HAZOP at www.curryhydrocarbons.ca

Helpful Member!  brunotanner (Mechanical)
8 Jul 03 19:33
Gasifying of biomass depends a lot on the fuel to be gasified. For wood on the average I offer this info.

aprox 6.27 lbs air per lb of fuel (on ratio  O/R) and dry fuel.

About 30% of incoming O/R air is used to gasify.

Operating at 50% excess (XSA) air is good!

 The smaller wood particle size you have the better you will gasify and 20% moisture content and less is preferred but I have gasified with MC at 37%. depends on physical makeup of furnace.

The perfect gasifying device is one that will float in the closest body of water. If it floats you know you have total control over the air and fuel inputs and that is exactly what it takes to make a great gasifier.

You will not be happy with attempts to gasify unless you have total and absolute control of all air going into the gasifier.

I have about 35 years experience with gasifiers and burning all types of solid fuels. If I can help further get in touch. That does not say I am an expert. Just that I have made a lot of mistakes and found their solution.

JVC
harryw (Mechanical)
19 Aug 03 10:36
Producer gas from most solid fuels runs between 100 and 150 BTU/cuft and thus requires between 1 and 1.5 cuft air per cuft of gas. Ask if you need more producer gas info.
ProEDesigner00 (Mechanical)
1 Mar 05 18:20
I know this thread is probably dead but I would like to talk about specifics with brummotanner if he is still around.

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