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GasifiersGasification is the cleanest, most efficient combustion method known. It has been used for decades where clean heat is required.Examples include the thousands of vehicles which were directly fuelled by Gasifiers during the Second World War, or the coal gas "works" which were common in cities all over the World before natural gas. These produced gas which combusted so clean it was used in chimney-less household appliances such as cookers and heaters, without adverse effects. Wood gas is also called producer gas consists chiefly of carbon monoxide and nitrogen. It is prepared in a furnace or generator in which air is forced upward through a burning fuel of coal or coke. Although the fuel is introduced through the top, no air is admitted there. The carbon of the fuel is oxidized by the oxygen of the air from below to form the carbon monoxide. The nitrogen of the air, being inert, passes through the fire without change. When steam is introduced with the air, the final gaseous product contains hydrogen also. Producer gas has a low heating value because it is about 60% inert nitrogen. It is widely used in industry because it can be made with cheap fuel. When producer gas contains hydrogen, it is also a source material for the manufacture of synthetic ammonia. [top] [end]Household stoves - microgasifiersRobert Flanagan, Chairman & President, of Hangzhou Sustainable Agricultural Food & Fuel Enterprise Co., Ltd. has sent few photos of a stand alone micro gasifier which significantly reduces domestic fuel needs.According to Mr Robert Flanagan "this stand alone micro gasifier cuts about 70% of fuel need for domestic cooking. This unit boiled 9L of water with less than 500g of wood and has a run time of about fifty minutes. The basic principle behind this gasifier is convection driven downdraft gasification. The biggest advantage of using downdraft is that you get water gas + wood gas when the water (H2O) passes through high temperature carbon (C) it cracks the water in to H2+CO (syngas). The best feedstock is biomass with a moisture content between 15-25% 20% being optimum. Mr Robert Flanagan with Dr. Zhong from China National Research Center of Bamboo hope to travel to Africa mid year to do a follow up demonstration of this stove so he'll be happy to keep us informed as to the outcome." He also added "This technology is far from new but it never hurts to take a look back once in a while."         [top] [end]External links and references
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Page created:
06 February 2004; Last edited:
14 February 2007; Version: 2 | |
Pagename: Gasifiers @HEDON: KRAA | |
