A Clean Burning Cookstove Developed in Vietnam

Alexis Belonio, Tran Binh, Doan Thi Minh Nguyet, and Bui Dinh Hai
VINASILIC SJ, Socialist Republic of Vietnam and Center for Rice Husk Energy,
Philippines January 24, 2010

Vietnam is producing a lot of biomass, such as agricultural and forest residues, annually
amounting to about 7 to 8 and 75 to 100 million metric tons, respectively. The country’s pressing need for a low‐cost fuel and a clean‐burning cook stove has led VINASILIC to develop, in early 2009, a new generation cooking technology that is suitable for Vietnamese households.
Adopting the TLUD principle for the stove, combined with the use of torrefied biomass
pellets as fuel for the stove, enable VINASILIC to produce a biomass gas stove
that emits blue flame, shown in abive photo, with very low black carbon emission (less
than 50 ug/m3).

The stove, as shown in the above photo, consists of a cylindrical reactor, an outer
cylinder, a gas burner, and a fan. The cylindrical reactor is where the fuel is gasified. It is provided with grate at the bottom for the passage of primary air. The outercylinder serves as stove
body and as burner support. The gas burner is where the gas generated from the reactor, mixed with preheated air, is ignited.

The fan is attached tothe stove body and is used to supply the airneeded for gasification.
The stove is made of a metal sheet, an earthenware and an ash insulation to prevent
escape of heat through the surface of the stove body. The primary air enters from the bottom
end of the reactor with the use of a 0.15‐Amp, 12‐ V DC fan. The secondary
air, on the other hand, enters the reactor through the holes in the middle of
the stove body and is mixed with the gas generated at the small holes located at the upper
portion of the burner. A skirt is sometimes provided for the stove to
increase heat transfer efficiency to the cooking pot.

The stove is locally fabricated and is named as “Vietnam Magic Flame” Stove. It is sold at US$
10 to 15 per unit. The biomass pellets, which are also developed and produced by VINASILIC, cost US$ 0.12 to 0.15 per kg. Compared with kerosene and LPG, the payback period for the stove is within 6 months. Moreover, VINASILIC has already started the promotion of the stove in Vietnam and will start its commercialization of the stove and the fuel soon to benefit the people.

See attached file.

Alexis Belonio, Center for Rice Husk Energy,
Philippines (atbelonio@yahoo.com).