TLUD Gasifier Stoves - A wood stove with a difference

The winner of the Sankalp 2010 award in the Clean Energy Sector – Established Enterprise Category, Servals’ TLUD Wood Gasifier Stove is a simple wood stove that is green and of low carbon emission. With other products such as the kerosene burner, kerosene stoves, hybrid cooking stoves, Plant Oil Stoves and Lamps already in the portfolio, Servals is indeed pleased to talk about their forays into the wood stove - TLUD stoves.

Some highlights

• The key focus is to design an integrated cooking energy solution for the wood stove market that addresses the “front-end” and the “back-end”.
  
  
• While the TLUD gasifier technology is not new, Servals’ TLUD Stove’s claim is that it represents a higher order of fuel efficiency, user friendliness, safety and newer user application.


• Recognized as a “carbon neutral” initiative; In fact would be "carbon negative" when the charcoal is dumped back into the soil. Read more...   and about the charcoal burning accessory
  
  
• Has the potential to create a series of economic activities around fuel collection and distribution.Read More...

• Has a line-up of innovations in the pipeline. Read more
  
  
  TLUD stands for Top Lit Up Draft. This is different from most of the ordinary cook stoves which are Bottom Lit Up Draft. There is a lot of interest in TLUD technology around the world since this saves around 75 % fuel material compared to a traditional 3 stone fire wood stove.

1. A second advantage with TLUD technology is that it can accept a lot of waste materials as fuel like twigs, coconut shells, certain husks, dry grass, etc. Some of these fuels are also available at zero cost in specific instances
   
2. A third advantage is that tree felling is not necessary for fuel, since residues as mentioned above is enough.



3. A fourth advantage is that the entire process is carbon-neutral if the resultant charcoal is also burned. In case this charcoal is taken out and used as a soil conditioner, the entire process becomes carbon-negative. ie. practically, carbon is removed from the atmosphere and deposited in the soil. Hence TLUD technology is extremely environment-friendly.

The Process: The canister is filled with the fuel material. A small quantity of starter material is put on top of this fuel bed and set on fire. Primary air for combustion comes from below through the fuel bed. The heat from the fire pyrolysis the biomass immediately below to form pyrolysis gases. These gases move up and get combusted with the pre-heated secondary air that is fed from around. Once the pyrolysis is over, a small quantity of charcoal is left behind at the bottom of the canister. This charcoal is generally transferred to a metallic or earthern closed container where the fire gets put out in the absence of air. This charcoal can be used later for various purposes.

The present design used by Servals has been given by Dr. Paul S Anderson of US, with initial financial support for the Chennai project by the Rotary Club of Bloomington-Normal Sunset (Rotary District 6490 - East Central Illinois).

As it looks at present, TLUD Gasifier Stove technology holds tremendous potential in relation to greener environment and low carbon initiatives.

Here is a demo of the TLUD Wood stove. Read about the charcoal burning accessory here

Here is a certificate for our TLUD Gasifier Stoves received from MSME Testing Center of the Government of India, Ministry of Micro, Small and Medium Enterprises. The certificate certifies that the CO/CO2 ratio is less than 0.04 in the combustion gases leaving the stove - which means a clean combustion and emission within safe limits.

Here is also a chart that shows the Carbon Monoxide (CO) and Particulate Matter (PM) emissions for various biomass stoves, along with the recommended standards for these emissions.

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