Method for the combined residue gasification of liquid and solid fuels

Abstract

A process for joint entrained-bed gasification of ash-containing solid fuels and liquid fuels which are fed separately of each other to the coal gasification reactor via several burners, said burners having a concentric firing angle of greater than 0 degree such that soot formation is reduced and the conversion efficiency is increased, and the solid is conveyed to the gasification reactor together with an inert gas, and at least part of the ash-containing solid fuel contains fine coal particles which originate from coal mining and are not suited for fixed-bed gasification, and the liquid ash-containing fuel contains residues from a fixed-bed gasification.

1 . Process for the recovery of syngas by the gasification of ash-containing liquid residues from a fixed-bed gasification at a pressure of 0.3 to 8.0 MPa and a temperature above 1400° C. using oxygen-containing gaseous gasification agents in a cooled reactor,
 characterised in that 
 the ash-containing liquid fuel is fed to the reactor together with an ash-containing solid fuel, and 
 the liquid and the solid fuel are fed to the reactor separately via several burner systems, and 
 the liquid and the solid fuel are fed to the reactor secantly to the circumference of the reactor at a firing angle above 0°, and 
 the ash-containing solid fuel, dispersed in a carrier gas is fed to the reactor, and 
 the ash-containing solid fuel constitutes at least part of the portion of fine coal particles from coal mining which cannot be used for fixed-bed gasification. 
 
     
     
         2 . Process according to  claim 1 , characterised in that the residue product from the fixed-bed gasification contains hydrocarbons, in particular tars, but also phenols, fatty acids and ammonia. 
     
     
         3 . Process according to  claim 1 , characterised in that carbonaceous solid fuel is a coal of a fine grain size, preferably below 5 mm, which cannot be used in a fixed-bed gasification. 
     
     
         4 . Process according to  claim 1 , characterised in that the burner system for the supply of the ash-containing liquid fuel consists of three tubes arranged concentrically, oxygen or an oxygen-containing gas being conveyed through the inner and the outer tube of the burner system and the ash-containing liquid fuel being conveyed through the central annular gap formed by the inner and the outer tube. 
     
     
         5 . Process according to  claim 4 , characterised in that the burner system including the three tubes concentrically arranged has a conically tapered end and is equipped with a cooling chamber in the area of the burner outlets. 
     
     
         6 . Process according to  claim 1 , characterised in that the carbonaceous fuel is supplied via two or more burner systems facing each other and, staggered by 90 degrees in relation to these in the horizontal, the ash-containing liquid fuel is supplied via two or more burner systems facing each other. 
     
     
         7 . Process according to  claim 1 , characterised in that the burner systems are distributed over one or several horizontal planes. 
     
     
         8 . Process according to  claim 1 , characterised in that the firing angle between the discharge direction of the fuel and the connection line between the burner nozzle and the axis of symmetry of the reactor is 3-6. 
     
     
         9 . Process according to  claim 1 , characterised in that the firing angle opposite the horizontal plane is greater than 0 degree. 
     
     
         10 . Process according to  claim 9 , characterised in that the transport gas consists of 100% or less of nitrogen or carbon dioxide or a combination of both gases.