[Stoves] venturi system -ratios of air and gas?

[Frank Shields]

Dear Stovers,

All the monitoring and measures of oxygen and gas are meaningless until we get the gas producer (Fuel) characterized with restrictions and boundaries on size, shape, moisture, and organic components. These conditions mentioned along with all the conditions followed Box 1 to Box 6 when talking about the gas / air mentioned.  That because the gas contains many different organic structures ‘crack’ (if thats the right word) at differing temperatures and it is very complicated. i think we need to establish and include the fuel (Box 1) and combustion conditions Box 2 to Box 6) to be able to talk about correct air / fuel ratios found to be best. 

Until we address the 6 Boxes we continue to go nowhere. Year after year we go in circles talking about nothing. 

Jock ideas of a 3-D printer making stove parts is great. Perhaps we can make 3-D fuel? Because without characterizing the fuel to use the 3D designed stove will be meaningless. 

Regards

Frank

Frank Shields
Franke at cruzio.com <mailto:Franke at cruzio.com>


  










> On Jan 10, 2016, at 5:10 AM, Jock Gill <jock at jockgill.com> wrote:
> 
> Good morning:
> 
> It would be great to work with a 3D ceramic printer to make custom designs (shapes, dimensions) of ALL the components.  That would be very interesting.
> 
> Cheers,
> 
> Jock
> 
> Jock Gill
> P.O. Box 3
> Peacham,  VT 05862
> 
> Cell: (617) 449-8111
> 
> google.com/+JockGill <http://google.com/+JockGill>
> 
> :> Extract CO2 from the atmosphere! <:
> 
> Via iPad
> 
> On Jan 9, 2016, at 7:05 AM, Julien Winter <winter.julien at gmail.com <mailto:winter.julien at gmail.com>> wrote:
> 
>> Hi folks;
>> 
>> I believe that thorough mixing of secondary air with somewhat (don't know how much yet) more than the stoichiochmetric requirement for oxygen is important for clean-burning wood gas in natural draft burners.  This is because the wood gas is very complex containing fast-reacting H2, CO, CH4 and slower reacting tars.  If oxygen is sufficient, then the fast gases, slow gases, suspended droplets and particles, and secondary products like soot, will oxidize in close proximity.  If oxyen is limited, then fast gases will react, and we loose heat from the site of reaction; heat that would have provide activation energy, and accelerated the reaction rates of the slower species.  
>> 
>> Conservng the heat is important for people who design gas burners that add air in stages.  It is also why I am cautious about adding secondary air through the side-walls of ND-TLUD reactors.  If this isn't done carefully, we end up with unburnt wood gas and products of incomplete combustion that we can't ignite because the reactants are too cold and too dilute. 
>> 
>> For a TLUD, the stoichiometric requirement for secondary air will depend inversely on the rate of primary air, where the combustion begins.  I recall that Mukunda lab in India reported that the ratio of secondary to primary air changed from 6:1 to 3:1 as the rate of forced draft gasification of pellets increased.
>> 
>> Cheers,
>> Julien
>> 
>> 
>> -- 
>> Julien Winter
>> Cobourg, ON, CANADA
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