Pulverized-coal supply system for coal gasification furnace

Abstract

To provide a pulverized-coal supply system for a coal gasification furnace in which the consumption of inert gas (the amount used) can be reduced. The pulverized-coal supply system is equipped with a pulverized-coal supply hopper ( 3 ) that receives pulverized coal pulverized by a coal pulverizer ( 1 ); a first pressure tank ( 31 ) that, when the pulverized-coal supply hopper ( 3 ) receives the pulverized coal, temporarily recovers part of inert gas filled in the pulverized-coal supply hopper ( 3 ) and supplies the recovered inert gas into the pulverized-coal supply hopper ( 3 ), whose interior is in an atmospheric pressure state; and a second pressure tank ( 32 ) filled with inert gas having a pressure necessary for increasing the inner pressure of the pulverized-coal supply hopper ( 3 ) to a predetermined pressure.

1 . A pulverized-coal supply system for a coal gasification furnace, the system comprising:
 a pulverized-coal supply hopper that receives pulverized coal pulverized by a coal pulverizer;   a first pressure tank that, when the pulverized-coal supply hopper receives the pulverized coal, temporarily recovers part of inert gas filled in the pulverized-coal supply hopper and supplies the recovered inert gas into the pulverized-coal supply hopper, whose interior is in an atmospheric pressure state; and   a second pressure tank filled with inert gas having a pressure necessary for increasing the inner pressure of the pulverized-coal supply hopper to a predetermined pressure.   
     
     
         2 . The pulverized-coal supply system for a coal gasification furnace according to  claim 1 , wherein at least two of the pulverized-coal supply hoppers are provided, and wherein when at least one of the pulverized-coal supply hoppers receives the pulverized coal, the other pulverized-coal supply hopper supplies the pulverized coal to the gasification furnace. 
     
     
         3 . The pulverized-coal supply system for a coal gasification furnace according to  claim 1 , wherein the capacity of the first pressure tank is from 25% to 100% of the capacity of the pulverized-coal supply hopper. 
     
     
         4 . An integrated coal gasification combined cycle facility comprising the pulverized-coal supply system for a coal gasification furnace according to  claim 1 . 
     
     
         5 . A method for operating a pulverized-coal supply system for a coal gasification furnace comprising:
 a pulverized-coal supply hopper that receives pulverized coal pulverized by a coal pulverizer;   a first pressure tank that, when the pulverized-coal supply hopper receives the pulverized coal, temporarily recovers part of inert gas filled in the pulverized-coal supply hopper; and   a second pressure tank filled with inert gas having a pressure necessary for increasing the inner pressure of the pulverized-coal supply hopper to a predetermined pressure,   wherein the inert gas recovered into the first pressure tank is filled into the pulverized-coal supply hopper, whose interior is in an atmospheric pressure state, and thereafter, the inert gas filled in the second tank is filled into the pulverized-coal supply hopper.   
     
     
         6 . The method for operating the pulverized-coal supply system for a coal gasification furnace according to  claim 5 , wherein at least two of the pulverized-coal supply hoppers are provided, and wherein when at least one of the pulverized-coal supply hoppers receives the pulverized coal, the other pulverized-coal supply hopper supplies the pulverized coal to the gasification furnace.