Wherever stick-wood is plentiful and at a low cost available, conventional improved cook stoves (e.g.
Gasification has an immense potential to make use of a great variety of biomass residues that are difficult to burn cleanly in conventional stoves. blown out by gusty wind), the gas-generator will continue producing wood gas, which will not be burnt and then escape as thick white smoke from the stove. However, should the flame of the gas-burner extinguish (e.g. If the gas-burner operates well then there is no problem.
This “smoke” is burnt by the gas-burner, which is thus basically a ‘smoke-burner’. Micro-gasifiers burn the biomass in two stages: first the gas-generator produces the wood gas, which is a thick whitish ‘smoke’ or fume.In this case the power of the fan can be regulated. The heat output of most micro-gasifiers is not easy to regulate unless the stove is operated with a fan for forced convection.Thus, cooking times are pre-determined by the size of the fuel container. Most micro-gasifiers are batch-loaded and cannot be refueled during use.Firewood in the form of large logs or sticks is not suited and needs other types of improved stoves. They are only useful if fuel is available in the right size. Micro-gasifiers need small-sized fuel.Users may encounter some challenges when using gasifier cookstoves: ĭisadvantages and Challenges of Gasifier Stoves Performance similar to biogas (but not dependent on water and bio-digester) and approaching the convenience of fossil gases.įurthermore, pyrolytic micro-gasifiers can create charcoal, which may be used in a charcoal stove, further processed into charcoal briquettes or used to improve soil productivity as biochar.
TWIG STOVE PORTABLE
Solid biomass fuels are often available locally (affordable access at own convenience), easy to transport and easy to store after gathering.Ĭreation of gas from dry biomass can be achieved with very simple inexpensive technology directly in the burner unit, which is portable and does not require piping or special burner-heads (in most cases). There are also advantages compared to stoves operated on alternative fuels like liquid fuels or solar: Easy lighting allows for cooking to commence within minutes, much faster compared to lighting charcoal.Uses a wide variety of small-size biomass residues (no need for wood pieces or charcoal).More efficient due to more complete combustion (less total biomass consumption).Cleaner burning of solid biomass (considerable reduction of soot, black carbon and indoor/outdoor air pollution).įor more information on the process of wood gas generation see also Cooking with Woodgas.Ĭompared to solid biomass burning improved cookstoves, gasifiers have certain advantages: The “gas burner” provides the convenience and efficiency similar to cooking on fossil gas with very little soot and other emissions. Gasifier stoves are currently the cleanest burning option to burn solid biomass in a cook stove. The regulation, however, is a bit tricky and one of the challenges is to find a better solution to this. More air to the ‘gas-generator’ produces more gas that can be combusted in the ‘gas-burner’. controlling the supply of air and regulating the availability of oxygen for optimizing the subsequent steps of wood gas combustion and char gasification.regulating the heat that is reaching the solid biomass to optimize the drying and pyrolysis process.In contrast to this, gasifiers control and optimize both processes separately to achieve efficient and clean utilization of the fuel: In a conventional fire the heat is controlled by regulating the fuel supply: the more fuel we add, the more heat we generate, provided sufficient air is available for the combustion.
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