Dry coal powder gasification furnance

Abstract

A dry coal powder gasification furnace comprises a furnace body. The furnace body consists of a gasification furnace body for hot and dirty coal gas ( 1 ) and a hot and dirty gas reforming and cleaning furnace body ( 2 ). There is a gasification chamber ( 3 ) in the upper part of the gasification furnace body ( 1 ) and a settling chamber ( 4 ) in the lower part of the gasification furnace body ( 1 ). There are multiple coal powder nozzles ( 9 ) at the upper part of the gasification furnace body ( 1 ). One ends of the multiple coal powder nozzles ( 9 ) are connected to the gasification chamber and another ones are connected to a coal-spraying pipe ( 8 ). The coal-spraying pipe ( 8 ) is connected to a screw feeder ( 7 ). The screw feeder ( 7 ) is mounted below a loading lock hopper ( 6 ). Multiple gas nozzles ( 10 ) connected to the gasification chamber ( 3 ) are mounted at the upper part of the gasification furnace body ( 1 ) and below the coal powder nozzles ( 9 ). Multiple regulating gasification nozzles ( 11 ) connected to the gasification chambers ( 3 ) are mounted at the middle part of the gasification furnace body ( 1 ) and below the multiple gas nozzles ( 10 ). Multiple cool nozzles ( 12 ) connected to the settling chamber ( 4 ) are provided at the lower part of the gasification furnace body ( 1 ). Water-cooled walls ( 13 ) are provided in the settling chamber ( 4 ). A water-cooling grate ( 19 ) is mounted in the middle part of the reforming and cleaning furnace body ( 2 ). The fluidized bed gasification furnace with the nozzles is simple in structure and reliable in operation. The compositions of the produced coal gas can be easily controlled and the high-pressure coal gas produced can be directly supplied to users.

1 . A dry coal powder gasification furnace, comprising:
 a gasification furnace body for hot and dirty coal gas having a gasification chamber in an upper part of the gasification furnace body and a settling chamber in the lower part of the gasification furnace body, wherein a plurality of coal powder nozzles is provided on an upper part of the gasification furnace body, one ends of the coal powder nozzles are connected to the gasification chamber and the other ends are connected to a coal-spraying pipe, which is connected to a screw feeder mounted below a loading lock hopper; a plurality of gas nozzles connected to the gasification chamber is mounted on an upper part of the gasification furnace body and below the coal powder nozzles; a plurality of regulating gasification nozzles connected to the gasification chambers are mounted on a middle part of the gasification furnace body and below the multiple gas nozzles; a plurality of cool nozzles connected to the settling chamber are provided on a lower part of the gasification furnace body; a water-cooled walls are provided in the settling chamber.   and a hot and dirty gas reforming and cleaning furnace body, connected to and communicated with the gasification chamber on a lower part thereof through a connecting channel, comprising a gas outlet provided on an upper portion, a feeding bell provided on top thereof, a plurality of cool nozzles provided on a lower portion thereof, and a discharging lock hopper provided on a bottom thereof, and a water-cooling grate mounted in a middle part thereof.   
     
     
         2 . The dry coal powder gasification furnace, as recited in  claim 1 , wherein the plurality of gas nozzles, regulating gasification nozzles and cool nozzles are all upwardly inclined. 
     
     
         3 . The dry coal powder gasification furnace, as recited in  claim 1 , wherein coal powder is sprayed into the furnace by high pressure steam through nozzles, a plurality rows of high temperature air or oxygen and steam is prayed inclinedly and upwardly into the furnace through the nozzles below the coal powder nozzles, and the components of the gas can be adjusted. 
     
     
         4 . The dry coal powder gasification furnace, as recited in  claim 1 , wherein the steam is preheated up to 1100° C.-1300° C. by a steam preheater, and the air is preheated up to 1000° C.-1200° C. by a air preheater. 
     
     
         5 . The dry coal powder gasification furnace, as recited in  claim 1 , wherein a gas produced by the furnace contains 35-50% CO, 38-43H 2 , and small amount of CH 4  and N 2 , which can be used as fuel, chemical material, and raw material to extract H 2 . 
     
     
         6 . The dry coal powder gasification furnace, as recited in  claim 1 , wherein hot and dirty gas reforming and cleaning furnace body may be used for reforming gas in a coke furnace.