Biochar

Notes from Paul Anderson
Gustavo has presented a very nice video of the use of a tall TLUD gasifier under a DUAL purpose stove frame (frame = stove structure without the heat source) that first boiled 5 liters of water in 12 minutes, and then converted into a plancha stove with chimney, cooking papusas (related to tortillas). Total cooking time 1 hour 45 minutes on one batch of wood chips/chunks (5237 grams) that yielded 1300 g of char. 25% weight yield of char. Probably could have operated an additional 10 minutes with pyrolysis fire and a slightly lower percentage yield of char.

Note: That is approximately 4000 g of fuel of pyrolytic gases (including moisture content that was probably near 15%). Any ash content (probably 1% of the raw fuel) remained in the char.

For a comprehensive resource for TLUD stoves, see Paul's web site: http://www.drtlud.com/

A few more pictures to clarify how the Rim Fire iCan is built. It is quite simple.

Materials:

A loaded kinyanjui type barrel kiln carbonizing maize cobs
free fuel!
a full kin of maize cob and branch charcoal made in less the a day
the maize cob charcoal cooks with high heat and little smoke.

Four very good reasons why to make your own charcoal from dry maize cobs.

  1. They are FREE!! (minimal processing required and are widely available as a farm waste product)
  2. Maize cob charcoal is very easy to make and leaves few charcoal fines. (no need for expensive briquetting)
  3. They are easy to light and burn very hot with little ash and are perfect for cooking a quick meal.
  4. Using maize cob charcoal means ZERO reliance on tree's and forests, LPG gas or unreliable and expensive electricity supplies for your cooking fuel needs. And with a Cookswell Jiko you can bake, boil, roast and toast all of your favorite foods
File attachments: 

New video and print resources available at www.aqsolutions.org.

Contamination of drinking water sources by synthetic organic compounds (SOCs – e.g. pesticides, pharmaceuticals, fuel compounds, etc.) is a growing worldwide problem. Many of these chemicals bio-accumulate in the human body and cause cancer, birth defects and diseases of the reproductive system, and disrupt endocrine and neurological systems. However, few low-cost, sustainable and appropriate treatment technologies are available to rural and developing communities for SOC removal.

Water filtration using charcoal is an ancient practice that continues today in non-industrialized regions around the world, though it has not yet been rigorously demonstrated for removal of modern industrial pollutants. Unfortunately, charcoal production by traditional kiln systems is often a resource-intensive and highly polluting process, and kiln processes are typically not optimized for production of good water filter char. Low cost, energy efficient, environmentally sustainable and scalable local production of optimal water filter char can be accomplished with biomass gasification (e.g. cookstoves and larger units using the TLUD design).

The video and print resources available on the Aqueous Solutions website (www.aqsolutions.org) are intended to

  1. summarize current results of collaborative field and laboratory research pertaining to the use of traditional kiln charcoals and gasifier chars in decentralized water treatment that targets SOCs,
  2. provide instructional materials for construction and operation of small- and intermediate- scale gasifier char production units using local materials, and
  3. provide instructional materials for integration of biochar filtration into a multi-barrier small- and intermediate- scale water treatment systems constructed from inexpensive and widely available materials.

Biocharproject.org announces the stumpy biochar combination cooker.

Its a tlud its a rocket stove it has many applications and fully customisable.
Simple design utilises waste LPG tanks to provide safe efficent cheap cooking.

Designed and Made in Australia by Biochar Project and Labrador Mens shed.

See the complete story on http://biocharproject.org

Open source free design

Stove schematic
building the stoves
testing the stoves

Stephen Joseph, Do Duc Khoi, Tran Manh Hung, Mai Thi Lan Anh, Nguyen Van Hien, Nguyen Hong Hanh, Hoang Huu Dung

SEM Images C. Chia and with the University of New South Wales

Please Read the Original Slide Presentation
http://stoves.bioenergylists.org/files/development_of_tlud_cookstoves_and_drum_ovens_in_north_vietnam_0.pdf

The TChar(tm) stove is a TLUD stove that lifts off at the end of the gasification stage to drop the charcoal into a T-base(tm): a charcoal stove to continue cooking with the charcoal created or a quench base to save the charcoal for biochar or other use.
Download Part A of TChar Technology for Cookstoves at:
http://drtlud.com/

Mussie T. (Lecturer at Mekelle University, Ethiopia), October, 2011

This is a Natural Draft Gasifier stove, that is designed with a central column of air that is designed to burn more common Ethopian fuels, e.g. coffee husk and saw-dust (cow dung binder) briquettes in addition to more conventional wood chips.

the air column is drilled on the surface so as to let additional primary air radially into the fuel at different stages to compensate for air clotting that can occur when run with small sized fuel as you go up from along fuel column. This helps the flaming pyrolysis from being air starved due to interlocking of fuel particles. In addition to that, closely spaced holes of relatively larger size were made near the top of the central air column to supply more hot post‐pyrolysis secondary air. The presence of two hot secondary air admission points is meant to supply enough air while keeping the stove short with reduced heat loss.

Once the stove has enough fuel, it is typically started with wood chips, or an accelerant to help the briquettes light, and then in all of the trials it burned without smoke until the fuel tank was filled with charcoal (typically between 60 and 90 minutes later). This is a biochar-producing stove, the stove does not efficiently combust it. Friability and the composition of the char depended upon the feedstocks.

For an excellent analysis of the stove, and pictures of the biochar, please see the included Report: Results from Preliminary Experiments Conducted on Multi‐level
Primary Air Entry Gasifier Stove

Paul Olivier, September, 2011

Paul Olivier is working from Vietnam, and had put together a comprehensive pdf article explaining the benefits of using TLUD and other gasifier stoves to avoid cooking smoke and create biochar. Cooking Smoke is a major health problem in both rural and urban areas in Vietnam and many other parts of the world, and improved stoves that can also produce biochar can also help urban and rural people retain nutrients in their soils, and reduce pollution.

For more, please download the pdf: Biomass Gasification and the benefits of Biochar

Biochar Industries part of Biochar Project in Kunghur Australia is now selling Biochar TLUD cook stoves as part of our plan to make more people aware of the benefits of biochar.

TLUD is an acronym for Top Lit Up Draught meaning you lite it at the top and the air is sucked up through the fire. Fantastic device that is light to carry and will work with all woods great survival tool . The best feature of this Tlud is when the flames go out you then have biochar. All you have to do is drop the embers on the ground and spray some water on them so they don’t continue to burn.

This particular model was imported from India and has a very nice finish and somehow I ended up with some to sell so I wanted to let my readers know first before I start selling them at stores and markets.

More on TLUD stoves http://www.drtlud.com/

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