[Stoves] Traditonal Charcola Making Process / retort

[Kevin Chisholm]

Dear Crispin

For the sake of completeness I have put together your first posting 
(C1), my first posting (K1) and your second posting (C2)

It appears that I totally misunderstood the problem. In C1, I thought 
you were referring to 3.5 kW of electricity being required for such 
things as blowers, motors, controls, etc., and that you wanted to 
generate on-site power.

It now appears that the 3.5 kW was the electrical heat required by 
resistance heaters to power the equivalent of a "pottery kiln" in with 
you propose to bake clay stoves using gas as the energy source.

You then talk about using the gas from the gasifier to fire "the ovens"

You then talk about a "MCS" (What is an MCS?) that will need about 7 kW 
of gas heat to produce 3.5 kW of electricity.

In the quiz section, you then ask how much 15% biomass is required to 
fire one "stove?"

You mention "The idea is to make charcoal and use the gas to fire 
charcoal stoves directly."

I am really confused. Do you want to basically pyrolyze wood, and 
produce charcoal, then gasify the charcoal as a separate operation?

Could you please start over and describe the desired operation a bit 
more clearly?

Perhaps you could describe the components of your system and how they 
would fit together on a flow sheet?

Sorry for the misunderstanding.

Best wishes,

Kevin



***********************************
C2
Dear Kevin

That was good...but I don't need electricity.  I can burn the gas directly
in a gas oven.

Gas ovens use a lot more energy because there is a high temperature exhaust,
but usually it is cheaper than electricity.  Certainly above 200 KW it is
16% cheaper to use gas.

So the idea is to make charcoal and use the gas to fire charcoal stoves
directly.

Wanna run that calculation again?

Thanks
Crispin
**************************************
K1
Kevin Chisholm wrote:
> Dear Crispin
> 
C1
> Crispin Pemberton-Pigott wrote:
>> Dear Friends
>>
>> My ultimate vision of charcoal making is to make a huge gasifier into which
>> I will put all sorts of waste biomass.  The gas will be used to fire ovens
>> in which I will make high efficiency all-ceramic charcoal stoves.
>>
>> The charcoal powder will then be made into fuel for the stove.  In this way
>> the wasted heat (or heat potential) of the original biomass can be used to
>> reduce fuel consumption.
>>
>> Today's quiz:
>> An MCS requires about 3.5 KW of electricity so it will need about 7 KW of
>> gas heat to produce it.  
>>
>> How much biomass (in KG) at 15% moisture content is required to fire 1 stove?
> 
> I would say that you would need a 1,500 RPM engine of about 750 CC 
> displacement, Spark Ignition, to produce 4.0 kW of Shaft Power, 
> delivering about 3.5 kW of electrical power. (I assume you need 50 Hz 
> power.)
> 
> You would probably need about 4.78 kG/Hr of wood at 15% MC, yielding 
> about 10.5 M^3/hr gas.
> 
> Such an engine run at 1800 RPM could produce up to about 4.2 kW 
> electric, but would require about 5.74kG/hr of wood.
> 
> Best wishes,
> 
> Kevin
> 
> 
>> Regards
>> Crispin
*********************************************
>>
> 
> 
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