Beverage-can Stove - History and Design

History and Design

The basic design dates back more than a century. It consists of a double-wall gas generator, a perforated burner ring, and an inner preheat chamber. A similar design was patented in 1904 by New York coppersmith J. Heinrichs. Trangia has been selling a commercial version of the design since 1925, and Safesport marketed a stainless-steel stove in the 1990s. The Trangia stove burner is made from brass, although all the other associated parts that come with it are aluminium.

In the unpressurized open-top design the double wall acts as a gas generator, transferring heat from the flame to the fuel. This effect enhances combustion, producing more heat than other passive designs. The inner wall also creates a convenient preheat chamber for starting the stove. Once the fuel has warmed up, its vapor will travel up the hollow wall, pass through the perforations, and form a ring of flame. This improves air/fuel mixing and therefore combustion. Vapor also rises from the center of the stove, but will pass through the ring of flame for efficient combustion as long as a pot is over the stove. Other pressurized designs aim for efficient combustion through closing the fuel chamber after filling, or by filling through the gas-jet holes.

A wick may be inserted into the hollow wall, where it will draw fuel upwards closer to the hot parts of the burner. Evaporating fuel from the wick removes heat from the top parts of the burner and subsequently the fuel at the bottom receives less heat. This slows down evaporation through the center while increasing the gas pressure inside the wall, spreading the ring of flame outwards, inwards, or vertically depending on the jet directions, while the center of the burner produces almost no flame, leading to a more controlled burn and faster starting. Suitable wick materials include fiberglass or cotton cloth. The wick will not burn because the evaporating fuel keeps it cool, and the pressure inside prevents air from entering the hollow until the burner can no longer produce enough gas to support a flame. Cellulose cigarette filters wick fuel efficiently upwards but melt and burn in all but the least powerful designs. Other wick materials in use are Kevlar and other aramid fibers, carbon felt, fiberglass, and even toilet paper.