Slag gasifier for pressurized fixed bed

Abstract

The invention relates to a slag gasifier for a pressurized fixed bed. The slag gasifier comprises a coal lock for intermittently taking coal from a bunker and feeding the coal into a pressurized gasifier container, a transition bin enabling the coal in the coal lock to be fed in the pressurized gasifier container conveniently, the pressurized gasifier container for combusting and gasifying carbon-containing solid fuels at a certain temperature and with certain pressure by virtue of a gasifying agent from a nozzle, a connection pup joint for gasifying operations of slagging, chilling, evacuation and the like, a chilling chamber for chilling and cooling molten slag and a slag lock for storing vitric slag particles and discharging the vitric slag particles to the outside by a cone valve. An operation method of the slag gasifier comprises the steps of adjusting the temperature of a raw gas outlet, gasifying carbon-containing solid fuels, adjusting the gasifying load of the gasifier, controlling the operation pressure of the gasifier, controlling the pressure difference between the connection pup joint and the gasifier, slag discharge of a slag discharging port and slag support operations, chilling and cooling molten slag, controlling water quantity of the chilling chamber to remove heat of the molten slag, storing slag particles and discharging the slag particles to the outside.

Description

technical field [0001] The invention relates to a fixed-bed gasifier, and more particularly to a pressurized fixed-bed slag gasifier and an operation method of the pressurized fixed-bed slag gasifier. Background technique [0002] At present, the representative pressurized fixed-bed gasifier at home and abroad is the Lurgi furnace. The Lurgi furnace is a kind of equipment for pressurized coal gasification. Below the softening temperature of coal ash, a large amount of steam is injected to control the combustion temperature of oxygen and coal coke below the melting point of coal ash. There are many defects in the Lurgi furnace, such as low operating load of a single furnace, large steam consumption, large amount of waste water, dry ash discharge polluting the environment, low gasification efficiency, and high operating costs. [0003] In addition to the fixed-bed Lurgi furnace, entrained-bed gasifiers such as Shell furnace (represented by dry coal powder furnace) and Texaco ...

AI Technical Summary

Problems solved by technology

These two commonly used gasifiers have the following disadvantages: the shell furnace has a complex dry coal powder preparation system, large dust emissions, high investment costs for one-time equipment, high gasifier outlet temperature and too complicated structure, etc., and high oxygen consumption; The Texaco furnace has the disadvantages of low content of effective gas components, low efficiency of cold gas, poor adaptability of coal types, high gasifier outlet temperature, short burner life, many problems with chilling rings, large oxygen consumption, etc., and the structure of the gasifier is too Complex, dry feed with large dust emissions

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