Simultaneous gasification of coals of widely differing degrees of coalification in entrained flow gasification
View Patent ↗A method for gasification of fuel in an entrained flow of a gasification reactor. The method includes jointly gasifying a mixture of at least two different fuels having different degrees of coalification, including those of differing coal qualities such as brown coals and stone coals. The method also includes pulverizing the coals forming the mixture in specific grain bands and drying the coals forming the mixture to a specific residual water content.
1. A method for gasification of fuel in an entrained flow of a gasification reactor, comprising:
jointly gasifying a mixture of at least two different fuels with different degrees of coalification from the table shown below wherein the different fuels are fed to different drying and pulverizing systems to obtain the respective grain size distribution and moisture content specified therein;
providing a plurality of sluices for conveying the mixture to a dispensing vessel wherein the sluices are operated to enable continuous operation of the dispensing vessel; and
transporting the mixture from the dispensing vessel to a gasification reactor
Grain size
Moisture
Fuel
distribution
content
Petrol coke
(low
Anthracite
{close oversize brace}
reactivity
50% < 63 μm
Stone coal
V daf ≦18%)
95Ma % < 200 μm
<2 wt. %
Pyrolysis coke
≧99% < 250 μm
<2 wt. %
98% < 500 μm
Stone coal
≧94% < 250 μm
<2 wt. %
98% < 500 μm
Hard brown coal
≧94% < 250 μm
<8 wt. %
98% < 500 μm
Soft brown coal
≧55% < 100 μm
<12 wt. %.
≧97% < 500 μm
2. The method as claimed in claim 1 , wherein the different fuels are fed to a common drying and pulverizing system.
3. The method as claimed in claim 1 , wherein the different fuels are separately dried and pulverized and are mixed homogeneously in a mixing system.
4. The method as claimed in claim 1 , wherein the different fuels are pulverized and mixed.
5. The method as claimed in claim 4 , wherein the fuel mixture is put under an operational pressure in a pressure sluice and conveyed pneumatically as a dense gas or a pulverized fuel suspension to the gasification reactor.
6. The method as claimed in claim 1 , wherein the gasification reactor is operated at a pressure between normal pressure and 8 MPa and at a temperature between 1200-1900° C.
7. The method as claimed in claim 6 , wherein the gasified mixture of the different fuels is free of oxygen.
8. The method as claimed in claim 7 , wherein a gasification temperature is above a melting temperature of an ash.
9. The method as claimed in claim 8 , wherein the ash is removed as a molten flow from the gasification reactor.