Process and plant for the production and further treatment of fuel gas

Abstract

A process for producing fuel gas and for carrying out a metallurgical process includes providing first and second process stages. In the first process stage, biomass is reacted with an oxygen-containing gas so as to obtain a fuel gas containing at least one of carbon monoxide, hydrogen, carbon dioxide and steam. The fuel gas is cooled to a temperature in a range from 300 to 600° C. The cooled fuel gas is subjected to a solids separation. In the second process stage, the fuel gas after the solids separation is directly supplied to at least one burner of the metallurgical process, the temperature of the fuel gas being maintained above the condensation temperature of tar and within the range from 300 to 600° C. by supplying heat.

1 - 9 . (canceled) 
     
     
         10 . A process for producing fuel gas and for carrying out a metallurgical process, the process comprising:
 reacting, in a first process stage, biomass with an oxygen-containing gas so as to obtain a fuel gas containing at least one of carbon monoxide, hydrogen, carbon dioxide or steam;   cooling the fuel gas to a temperature in a range from 300 to 600° C.;   subjecting the cooled fuel gas to a solids separation; and   directly supplying, in second process stage, the fuel gas after the solids separation to at least one burner of the metallurgical process, the temperature of the fuel gas being maintained above the condensation temperature of tar and within the range from 300 to 600° C. by supplying heat.   
     
     
         11 . The process according to  claim 10 , wherein the fuel gas is cooled to a temperature in a range from 350 to 450° C. and maintained in the range from 350 to 450° C. in the second process stage. 
     
     
         12 . The process according to  claim 10 , wherein the biomass is gasified in a fluidized bed. 
     
     
         13 . The process according to  claim 10 , further comprising at least partly utilizing steam generated by cooling the fuel gas for power generation or in the first process stage. 
     
     
         14 . The process according to  claim 12 , further comprising at least partly utilizing steam generated by cooling the fuel gas as fluidizing gas in the fluidized bed. 
     
     
         15 . A plant for producing fuel gas and for carrying out a metallurgical process, the plant comprising:
 a first process stage including at least one first reactor configured to produce a fuel gas containing at least one of carbon monoxide, hydrogen, carbon dioxide or steam and having at least one supply conduit each for biomass and an oxygen-containing gas;   at least one cooling device disposed downstream from the first process stage;   at least one solids separating device disposed downstream from the at least one cooling device;   a second process stage including at least one second reactor configured to carry out the metallurgical process and at least one burner; and   a direct conduit from the at least one solids separating device into the at least one burner of the second process stage, the conduit being equipped with at least one device configured to supply heat and maintain a temperature of the fuel gas above a condensation temperature of tar.   
     
     
         16 . The plant according to  claim 15 , wherein the at least one cooling device includes a steam generator. 
     
     
         17 . The plant according to  claim 16 , wherein a steam outlet of the steam generator is connected, via a conduit, with a power generation stage or the first process stage. 
     
     
         18 . The plant according to  claim 17 , wherein the conduit extends from the steam generator to the first process stage, and further comprising a valve disposed in the conduit and configured to regulate or control a steam quantity.