Working a TLUD aka "Inverted Down Draft" wood boiler: The alchemy of secondary combustion

 

 

 So the idea of an outdoor wood stove water boiler is that the air source for the fire is from below. So how does this create a clean burn?

 I have a similar TLUD wood stove for camping.

 Combustion from the top creates a gasification zone, with the gas escaping downwards through ports located at the base of the burner chamber. The gas mixes with additional incoming air to provide a secondary burn. Most of the CO produced by gasification is oxidized to CO₂ in the secondary combustion cycle; therefore, gasification stoves carry lower health risks than conventional cooking fires.

 TLUD means "Top Light Upward Draft" stove but I prefer the other term "Inverted Down Draft"

 While technically accurate, the concept of an inverted downdraft was difficult to explain.

http://ecoechoinvasives.blogspot.com/2017/07/kang-bed-stove-conversion-of-hunter.html 

Why? Normally a wood stove burns from the oxygen source being above the fire and thus the smoke just travels up and away with all the pollution. But the Inverted Down Draft means that even though the oxygen source is from below and thus an "upward draft" - the direction of the fire based on burning is towards the oxygen - and so the draft is really inverted as a downward draft.

So the fire is not driven by the direction of the oxygen but rather the combustion is burning towards the oxygen.

 a process of “”top-lit updraft with migrating pyrolysis front”,

 

 

 

 

 So with the outdoor wood stove - the secondary chamber is actually underneath the fire box. Pretty wild.

And so for internal alchemy meditation the same concept applies:

This is the secret of Daoist tummo heat - you pull the fire (spirit) down by deep breathing which is the air intake at the bottom of the stove. This forces the gas (shen laser biophoton energy) to burn downwards and it goes out the sides (the small universe) and up as the qi energy (the steam) that is burned off again at the top of the stove (above the fire in the upper tan tien).

 

 The secret of Pyramid Power... as internal alchemy.

This is also the secret of the Kang "bed-stove" in China - traced back to at least 7000 BCE and called the

 Now think about it - Shen is Fire and the whole key of alchemy is to get the Shen below the water - to create steam as qi energy. The Steam in this case is the highly charged gasification fumes that are then burned off from secondary oxygen from below.

 

Secret of the Dragon's Breath as Qi:

DeCoding the ancient Kang Bed-Stove TLUD Bellows as the physical model for Daoist Neidan alchemy Neigong meditation training

 for more details.