Coal gasifier

Patent metadata

Field	Value
Publication number	US-9487715-B2
Application number	US-201514610826-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Oct 22, 2008
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

Provided is a coal gasifier enabling a reduction in size of a shift reactor by generating hydrogen-rich gasified coal gas. In a coal gasifier (G) generating gasified coal gas by a gasification reaction proceeding in a furnace fed with a gasifiable raw material, such as coal, and a gasifying agent, at least one of water and steam is fed to the furnace as a material accelerating a hydrogen-generating reaction that proceeds simultaneously with the gasification reaction.

First claim

The invention claimed is:

1. A process of generating gasified coal gas by a gasification reaction using a coal gasifier,
wherein said coal gasifier is a two-stage entrained-bed gasifier having:
a furnace comprising a combustion chamber and a reduction chamber,
a gas-cooling heat exchanger communicating with a downstream side of the reduction chamber, and
a water cooling wall covering outer peripheral surfaces of the combustion chamber, the reduction chamber, and the gas-cooling heat exchanger,

wherein said process comprises:
feeding, from outside of the furnace via a combustion chamber burner into the combustion chamber,
at least one of water and steam as a material accelerating a hydrogen-generating reaction proceeding together with the gasification reaction the steam being generated from water flowing in the water cooling wall and/or the gas-cooling heat exchanger,
a gasifiable raw material including coal, and
a gasifying agent;

feeding the gasifiable raw material from outside of the furnace via a reduction chamber burner into the reduction chamber, without feeding the gasifying agent, the water, and the steam into the reduction chamber;
cooling, in the gas-cooling heat exchanger, the gasified coal gas generated in the reduction chamber; and
controlling an amount of carbon (C) remaining in unreacted coal passing through the gas-cooling heat exchanger together with the gasified coal gas to 30% or more.

2. The process according to claim 1 , wherein an amount of the water or steam fed into the combustion chamber is 0.1 to 0.8 on a mass basis relative to an amount of the gasifiable raw material fed into the combustion chamber.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Yamamoto Takashi
• Yokohama Katsuhiko
• Koyama Yoshinori
• Ota Katsuhiro
• Ishii Hiromi

Classifications

• C10J2300/1853

  Steam reforming, i.e. injection of steam only · CPC title

• C10K1/04

  by cooling to condense non-gaseous materials {(C10K1/001 takes precedence)} · CPC title

• Y02E20/18

  Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS] · CPC title

• C10J2300/0976

  as steam · CPC title

• C10J2300/1838

  Autothermal gasification by injection of oxygen or steam · CPC title