Controllable slag deposition prevention regulation and control method for gasification furnace

Abstract

The invention discloses a controllable slag deposition prevention regulation and control method for a gasification furnace. The gasification furnace comprises a gasification furnace body and a chilling chamber, and the chilling chamber comprises a downcomer and a bubble breaking device arranged around the downcomer. During the operation period of thegasification furnace, by adjusting the liquid level of thegasification furnace, slag deposition in the chilling chamber is prevented or the slag deposition rate is slowed down by adopting a regular liquid-carrying operation mode; meanwhile, the gasification reaction temperature is increased, the carbon conversion rate is increased, and the fine ash amount is reduced, so that the material basis of slag deposition is reduced; after shutdown, pressurized water transportation is carried out, the liquid level of the gasification furnace is repeatedly increased and decreased, accumulated slag on the bubble breaking bed is taken away through the black water system or the slag removal system, the amount of accumulated slag during shutdown overhaul is further reduced, and the overhaul working condition is improved. In the aspect of structural transformation of the gasification furnace, the density of the bubble breaking strips is reduced, and the fan-shaped bubble breaking beds in the upper layer and the lower layer are distributed in a staggered manner, so that the number of bubbles in gas rising can be effectively reduced, the attachment surface of solid particles is reduced, and the space basis of slag deposition is reduced.

Description

technical field [0001] The invention belongs to the technical field of gasification furnace production control, and in particular relates to a controllable slagging prevention regulation method for a gasification furnace. Background technique [0002] The gasification process is a thermochemical process of carbonaceous substances. Gasification technology usually uses carbon-containing solid fuel powder such as coal or its liquid fuel as the raw material, and uses oxygen and water vapor as the gasification agent. After being injected into the gasifier through the burner, gas is generated under high temperature and high pressure conditions. Chemical reaction to produce high temperature and high pressure synthesis gas (or called coal gas) and slag. The gasifier is the core equipment of the coal gasification process, and the quench chamber is one of the important components of the gasifier. The high-temperature molten ash and crude syngas are cooled in the quenching chamber, w...

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Problems solved by technology

[0003] At present, no matter in the pulverized coal gasification or coal-water slurry gasification industry, with the prolongation of the operation period of the gasifier, slag accumulation generally occurs in the quench chamber, which will lead to distortion of the gasifier liquid level gauge, and then cause gasification Accidents caused by the shutdown of the gasifier seriously restrict the long-term operation of the gasifier

In addition, there is a lot of slag accumulation inside the quenching chamber, which leads to a series of problems such as heavy slag cleaning workload and long maintenance period during the maintenance of the gasifier, damage to internal parts during slag cleaning, and high risk of slag cleaning in the furnace.

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