| 摘要 |
<p>In the method a carbonous fuel is carbonised at a high temperature to carbon and the carbon is activated physically with the aid of water vapour and/or carbon dioxide into activated carbon. Activated carbon is manufactured with a co-current gasifier meant for manufacturing product gas, which gasifier has a furnace (32). The fuel is carbonised into carbon and the carbon is activated into activated carbon in the furnace of the co- current gasifier. At least a part of the water vapour used in the activation of the carbon is formed by gasifying moist fuel, whereby water vapour is generated, which functions as an oxidising gas in the activation. Wood chips, which have a moisture content of 30-40 percent by weight, may be used as the fuel. In the same way at least a part of the carbon dioxide used in the activation of the carbon is formed in the gasification process of the fuel. The product gas generated in the gasification contains carbon dioxide, which functions in the activation process as an oxidising gas either on its own or together with water vapour. Activated carbon may be manufactured as a by-product of the manufacture of product gas. When gasifying solid fuel, fly ash, which is at least partly activated carbon, is generated as a by-product.</p> |
