Method And Apparatus For Mixing And Pre-burning Gasification Agent

Abstract

A method and an apparatus for mixing and pre-burning a gasification agent are disclosed. The apparatus includes a gasifier body comprising a furnace chamber, a gas distribution plate, and a gasification agent mixing chamber. The apparatus also includes a pulverized coal transport pipe and a carbon-containing fly ash transport pipe, which respectively feed a pulverized coal and a carbon-containing fly ash to a middle portion of the gasification agent mixing chamber. The apparatus further includes a gasification agent transport pipe that feeds a gasification agent to a bottom of the gasification agent mixing chamber. The present disclosure advocates a pre-burning process of the gasification agent that involves the pulverized coal and the carbon-containing fly ash, which heats the gasification agent as the gasification agent is being fed to the circulating fluidized bed gasifier, thereby ensuring a more complete burning, pyrolysis and gasification of coal within the circulating fluidized bed gasifier.

1 . A method, comprising:
 feeding a gasification agent to a bottom of a gasification agent mixing chamber, wherein the gasification agent is mixed in a lower portion of the gasification agent mixing chamber;   feeding a pulverized coal and a coal-containing fly ash to a middle portion of the gasification agent mixing chamber;   pre-burning, pyrolyzing and gasifying the pulverized coal, the coal-containing fly ash and the gasification agent in the gasification agent mixing chamber to generate a high temperature coal gas and a high temperature fly ash;   introducing the high temperature coal gas, the high temperature fly ash and the gasification agent to a furnace chamber of a circulating fluidized bed gasifier via a gas distribution plate; and   burning, pyrolyzing and gasifying the high temperature coal gas, the high temperature fly ash, the gasification agent and a raw coal in the furnace chamber.   
     
     
         2 . The method of  claim 1 , wherein the gasification agent comprises high temperature air and water vapor. 
     
     
         3 . The method of  claim 2 , wherein the gasification agent further comprises oxygen. 
     
     
         4 . An apparatus for mixing and pre-burning a gasification agent, comprising:
 a gasifier body;   a pulverized coal transport pipe;   a carbon-containing fly ash transport pipe; and   a gasification agent transport pipe,   wherein:
 the gasifier body comprises a furnace chamber provided in an upper portion of the gasifier body, a gas distribution plate provided in a middle portion of the gasifier body, and a gasification agent mixing chamber provided in a lower portion of the gasifier body, 
 the pulverized coal transport pipe is in communication with a middle portion of the gasification agent mixing chamber and configured to feed a pulverized coal to the middle portion of the gasification agent mixing chamber, 
 the carbon-containing fly ash transport pipe is in communication with the middle portion of the gasification agent mixing chamber and configured to feed a carbon-containing fly ash to the middle portion of the gasification agent mixing chamber, and 
 the gasification agent transport pipe is in communication with a bottom of the gasification agent mixing chamber and configured to feed a gasification agent to the bottom of the gasification agent mixing chamber. 
   
     
     
         5 . The apparatus of  claim 4 , wherein the gasification agent fed to the bottom of the gasification agent mixing chamber comprises high temperature air and water vapor. 
     
     
         6 . The apparatus of  claim 5 , wherein the gasification agent transport pipe comprises a high temperature air transport pipe and a water vapor transport pipe. 
     
     
         7 . The apparatus of  claim 5 , wherein the gasification agent fed to the bottom of the gasification agent mixing chamber further comprises oxygen. 
     
     
         8 . The apparatus of  claim 7 , wherein the gasification agent transport pipe comprises a high temperature air transport pipe, an oxygen transport pipe and a water vapor transport pipe. 
     
     
         9 . The apparatus of  claim 4 , further comprising:
 a coal transport pipe; and   a gas-material mixture transport pipe,   wherein:
 the coal transport pipe is in communication with the furnace chamber at a middle location of the gasifier body, the coal transport pipe configured to feed a raw coal to the furnace chamber, and 
 the gas-material mixture transport pipe is in communication with the furnace chamber at an upper location of the gasifier body.