Method and system for homogenizing the delivery of fuels in a gasifier for generating syngas

Abstract

A method and a system for uniformization and regulation of the solid fuels pneumatically conveyed using dense-stream conveying, into a gasifier for the production of synthesis gas, is supposed to be configured in such a manner that clearly homogenized feed of the coal to the burner is made possible, whereby the short-term fluctuations are minimized and thus the gasification quality is improved, and regulation of the amounts of coal to the burner is structured to be more effective. This is achieved in that the fine-grain to dust-type fuel is first conveyed out of a feed container positioned below the burner level, to a level above the burner level, and subsequently homogenized in a line that is directed downward toward the burner.

1 : Method for uniformization and regulation of the solid fuels pneumatically conveyed using dense-stream conveying, into a gasifier for the production of synthesis gas,
 whereby   the fine-grain to dust-type fuel is first conveyed out of a feed container positioned below the burner level, to a level above the burner level, and subsequently homogenized in a line that is directed downward toward the burner, wherein gas is fed into the fuel stream, to regulate the fuel throughput, whereby mixing is undertaken just before or in the burner, and wherein for temperature regulation, in particular, at least a part of the gas used in the gasifier (moderation gas) is introduced into the conveyed fuel.   
     
     
         2 : Method according to  claim 1 , wherein
 the homogenization takes place in a line that is directed downward, the length of which line corresponds to at least five times the line diameter.   
     
     
         3 : Method according to  claim 1 , wherein
 the fuel is homogenized in a drop line that is passed out of an elbow, whereby the drop line is oriented at angles <20°, preferably at 0° from the vertical.   
     
     
         4 - 5 . (canceled) 
     
     
         6 : Method according to  claim 1 , wherein
 additional gas, such as nitrogen, carbon dioxide, steam, other inert gases or mixtures of them, is used.   
     
     
         7 : Method according to  claim 6 , wherein
 the additional gas is introduced by way of a pipe tap, in the immediate vicinity of the burner.   
     
     
         8 : System for uniformization and regulation of the solid fuels pneumatically conveyed using dense-stream conveying, into a gasifier ( 3 ) for the production of synthesis gas, particularly for carrying out the method according to  claim 1 , further comprising dense-stream conveying lines ( 2 ,  2   a,    2   b ) from a feed container ( 1 ) to the burners ( 4 ,  4   a,    4   b ) of the gasifier ( 3 ), whereby the end region of the dense-stream conveying line ( 2 ) is positioned perpendicular ahead of the burner ( 4 ), in each instance. 
     
     
         9 : System according to  claim 8 , wherein
 the length of the perpendicular dense-stream line section corresponds to at least five times the dense-stream line diameter.