<html><head></head><body data-blackberry-caret-color="#00a8df" style="background-color: rgb(255, 255, 255); line-height: initial;"><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="font-family: Calibri, 'Slate Pro', sans-serif; font-size: initial; text-align: initial; line-height: initial;">Dear Ron</span></div><div id="_originalContent" style="">
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I don't see a problem to make in but it would have to be similar to the burner Alex English has at his place. In other words some way to move the grate. </div>
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I would not jump to the conclusion immediately that it is 'hard' to do that. We just have to be imaginative. I think Paul Anderson has a system which uses a screw feed. All that is required is to feed the fuel at a rate faster than it burns. The result is
char in the ash. </div>
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In principle this could be done with a batch process that is on a grate and either shaken or moved periodically. The extinction of hot char is not a major challenge.
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It can be dropped into a hopper which has no air entry. Alex makes it this way. Just on a large scale. </div>
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If you take the route of using a screw feed, you are pretty much limited to pellets. </div>
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Alex is burning some pretty horrible stuff so he has devised a method of making it feed 'bashed up wood'. I am referring not to his big unit in this case but a much smaller water heater that burns the same scrap material. </div>
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The feeder requires an electric motor. </div>
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Regards </div>
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Crispin testing a stick burner today </div>
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<div><b>From: </b>Ronal W. Larson</div>
<div><b>Sent: </b>Tuesday, August 19, 2014 09:22</div>
<div><b>To: </b>Discussion of biomass; Crispin Pemberton-Pigott</div>
<div><b>Subject: </b>Re: [Stoves] Request for help on TLUD operating data</div>
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<div>Crispin and list</div>
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<div>I look forward to seeing more.</div>
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<div>Re the last item about a clean cross-draft stove - does that make char? If so, can you say more about it?</div>
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<div>Ron</div>
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<div>On Aug 18, 2014, at 6:52 PM, Crispin Pemberton-Pigott <<a href="mailto:crispinpigott@outlook.com">crispinpigott@outlook.com</a>> wrote:</div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Dear Ron</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">I will send you the files separately. They are old but demonstrate the principles. You can zoom the charts I think.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">There is a small misunderstanding about the way the EA is calculated in a chemically balanced manner. The O<sub>2</sub><span class="x_Apple-converted-space"> </span>content
of the other gases is needed to provide a substitute for the number ‘21’ or ’20.945’ in the EA formula.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">I have been told several times this approach is novel. What it gives is the actual oxygen availability in the fire that was present at any certain time. This is calculated as
if the oxygen came from air, even if it did not. The normal calculation is quite misleading and was not really make for wood burning. The formula used in the Testo (which is a good machine) is incorrect. Calculating it wrong means getting the wrong advice
on what to do to perfect a burner.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">The files are much too large to post to the list.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">I have a small comment on your combustion formula from another message. It is that the burning is not making CO2 (much) it is making CO and if the burn does make CO2 it is reduced
to CO (mostly) in the char bed. This affects your calculated number of moles.</span></div>
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<span class="x_apple-tab-span"> <span class="x_Apple-converted-space"> </span></span>4. Do I understand that between the red and yellow vertical lines that CO/CO2 is greater than 2%? How large might that get?</div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">The CO/CO2 ratio can reach 30% but more to the point I have tested stoves that had a CO(EF)[O<sub>2</sub>=0%] of 130,000 ppm. That can only be reached in a stove with heat driving
the reaction, not from a fire. I can explain later if it is important. None of these stoves are trying to make a high CO gas, they are trying to burn it so it is not all that relevant a point. Don’t worry.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">We look for stoves that can average below 2% CO/CO2 and some are well below 1%. Not all are TLUD’s remember. There is a crossdraft stove I have mentioned before that is cleaner
than all TLUD’s seen to date. It can also be refuelled so I think there is a future in tilting the TLUD community 90° in that direction.</span></div>
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<span style="font-size:11pt; font-family:Wingdings; color:rgb(31,73,125)">J</span><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)"></span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Crispin</span></div>
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