Thank you for you explanation Matt.
Do you have data that show if we put enought amount of water how much energy we get back from chacoal gasification ? (approximate)
How you measure water that is enought or too much in practical way?
Do you have any recommend chacoal gasifier design for me to start learning about it ?(if it has good efficiency and not too hard to build should be good)
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Not all gasifiers are created equal so that is a very hard question to answer. There are all kinds of conditions that determine how much water you can crack. Size of the generator versus the size of the reaction zone of your gasifier, fuel size, moisture content of that fuel, type feed stock used, humidity, climate ambient temperature, type of water injection system used and so on. I cant say anything as fact as I have not done a thorough enough investigation. However, I believe up to 20% of the energy density can be achieved with a good water injection system, good fuel, and other conditions that would favor that. One thing Ive learned is nothing is linear in wood gas and your results will more than likely not be the same as mine as climates and other things are different.
As for a system to get started there is not a better system that I know of that is better than the Simple Fire. Its easy, you can build it fast, there have been a ton of people that have built it and most of those people will gladly aid you in your build. So I would start there and join the fun. This will give you the foundation to advance your designs and add your own creativity later.
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I wood say mostly removing the undesirable moisture, so as too keep the heat high enough in the hearth or charbed, so that tar is not made after the gas passes through the charbed, My thoughts on the monerator hopper, then the extra well made light as possible WK heat exchanger, plays another roll ing keeping the tar cracking temps high enough in charbed WK or hearth imbert.Biggest battle moisture in wood gasifier, and 500 hours work building, and keeping the weight down while limmiting life of gasifier.
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I agree matt the simple fire is an excellent start and it works well. I like your char maker simple method, seems too work well too.
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Amen to what Matt has said and I mean all of the statement above.
Bob
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another question is does chacoal gasifier suite for vehicle that have vary in speed ?
how we adjust gas out rate of gasifier ? (Simple fire gasifier or another)
What if gas is out more than engine use is it gonna build up pressure in gasifier and make it risk to explode ?
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The engines suction is what demands gas production.
A gasifier runs on negative pressure aka vacuum.
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even we add a lot of air to air inlet ?
it is still vacum in reduction zone ?
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The entire system is under vacuum.
The engine pulls on the system.
The only way to get positive pressure is to have something like a turbocharger pushing air through the fresh air inlet of a gasifier. That leads to its own problems.
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I have found some gasifier that have blower push air to air inlet.
What is the reason behind this system. If gasifier it work under vacum it should pull air into itself.
or We need to provide air but not too much to make it positive pressure ?
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The blowers are used at start-up only.
They are not used during normal operation.
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No you dont want to do that. Those playing with that are developers and once a video is done its done. They most likely later discovered issues with this as it changes all the inner dynamics and it dont work so well. You dont want to create a positive presure environment inside a gasifier. This expands flows and create a broader reactions zone. Where a vacuum does just the opposite. You want the reaction focused to a specific area where the reaction is optimizer to process and specific volume of fuel the rest of the reactions can manage. Positive presure puts this way out of balance and will expand the initial reaction process beyond what the lower reaction process can handle. Think of a spring when expanded it gets bigger, when compressed it gets smaller. But the work to do either is the same. (blower before or blower after) Under vacuum you are focusing this same energy to a focal point on smaller amount of fuel. As this fuel is torn apart the gas produce is smaller and the lower reduction portion can then manage processing this gas to usable gas. Positive presure will be less focused and expanded. The energy from this initial reaction spread out to a larger volume. But this energy is also spread out so less heat is applied to a larger amount of fuel. Now you have much dirtier gas in large quantity that the lower reduction section has to deal with and it will be over whelmed.
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Thank you for your explanation Matt.
I have some very newbie question if you dont mind 
another thing that I am confuse is if syngas is build up in reduction zone and we dont pull the gas out to engine does it will cumulate and make positive pressure ? (or if chamber it is full of syngas so system dont build more syngas)
Can we accelerate gas production in same gasifier ? (how we do it or gas production is fix by size and design of gasifier) in my opinion we can suction gas out by the blower am I understand correct ?
this chart below I have found in some paper it show that energy yield of chacoal making is about 50 % of raw wood. Does it consider disadvantage of chacoal gasification ?
if we add some water to the system to get more energy in gas. it is still lower than wood gasification.
Do I understand something wrong ?
This is paper that I have mention above.
ESDELSEVIERSEP2006.pdf (403.1 KB)
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Build the Simpler Fire it will take all the mysteries away. If there is no flow then the reactions stop in there tracks. Yes there is post shut down gas production but it is very limited and will just vent into the system and bleed off. The gas is produced in milliseconds, no need to add an accelerator of any kind. When the engine requires more gas and pulls on the gasifier the gasifier responds near instantly.
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Yes charcoal you lose some energy. So what? Dont forget a wood gasifier will lose 30% in its reaction process. Plus energy to fuel equipment to reduce a raw feed stock to a usable fuel the gasifier can process. You are not losing very much and the trade off is a more reliable and consistent self sustaining system without tar. Ill take that anyday over a raw wood machine. << that is for small stationary) Large engines using chunk fuel is a different topic of discussion. For small scale charcoal is faster fuel to produce depending on what feed stock and methods used. I can process raw feed stock in less than 15 minutes for kiln for days worth of run time. After that the kiln is doing the work and providing its own fuel for its process. I then go about my day.
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Thank you Matt will going to build one for sure.
Does chacoal gasification have low tar or No tar I cant find any resource.
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There is no such thing as a tar free gasifier of any kind period.
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The thing about updraft Charcoal C, is that the hopper full of charcoal fuel acts as a preliminary filter. I donāt think Iāve heard anyone report gumming up an engine with one.
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You have to make sure the charcoal is converted entirely of course. Itās second nature to anyone thatās messed with charcoal gasifiers but isnāt always mentioned.
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Tom, l have. The thing is, runing a small engine occasionaly, you burn maybee a few tens, hundred of pounds at most per year. Statistic probability of geting something nasty mixed in with the char is low, and also chances are you take great care to make clean fuel. Driving a full time vehicle every day, burning trugh tens of pounds a week, sooner or later you WILL step on a landmine. Kids throw a bit of sawdust in the charcoal, you get a britle brand that you dont noticeā¦ and it only takes one such event to get you a sticky throtle. But it is true that usualy thats about the worse that it gets.
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