Burning coke reduction system and method of high-alkali metal coal

Abstract

The invention discloses a burning coke reduction system and method of a high-alkali metal coal. The system is characterized in that an inlet of a high-temperature smoke circulating pipeline is connected to an inlet end of a high-temperature superheater of a hearth outlet smoke channel; an inlet of a low-temperature smoke circulating pipeline is connected to an outlet end of a low-temperature superheater of the hearth outlet smoke channel; outlets of the high-temperature smoke circulating pipeline and the low-temperature smoke circulating pipeline are connected to an inlet of a pyrolysis bed; an outlet of a raw coal bin is connected to an inlet of a coal feeder, and an outlet of the coal feeder is connected to an inlet of a coal pulverizer; an outlet of a powder discharging fan is connectedto another inlet of the coal pulverizer; an outlet of the coal pulverizer is connected to another inlet of the pyrolysis bed; and an outlet of the pyrolysis bed is connected to an inlet of a burner.According to the system, pulverized coal is pyrolyzed through the pyrolysis bed by smoke circulation; in addition, active alkali metal is fixed in a manner of adding an adsorbent on the pyrolysis, sothat the content of volatile alkali metal is decreased; and the problem that a boiler cannot safely stably run for a long term due to serious coking of a heated surface of the boiler can be solved.

Description

Technical field [0001] The invention belongs to the technical field of power generation boilers, and relates to a system and method for reducing coking of high-alkali coal combustion. Background technique [0002] In recent years, the predicted coal reserves in Xinjiang in my country have been astonishing. At present, the cumulative proven coal reserves have reached more than 200 billion tons, making it my country’s largest integrated oil field. Low mining cost, good coal reactivity, and burnout are the advantages of Xinjiang coal. However, due to coal-forming history and the local special natural geographical environment, the coal produced in Xinjiang (such as Xinjiang Zhundong coal) also has alkali metal content Because of its high characteristics, burning high-alkali coal on an active boiler is extremely prone to coking, resulting in the boiler’s inability to operate safely and stably for a long time. [0003] Due to the volatilization of alkali metals in high-alkali coal, it i...

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Problems solved by technology

[0005] The purpose of the present invention: to provide a system and method for reducing high-alkali metal coal combustion coking, the system and method make coal powder pyrolysis through flue gas circulation, add adsorbent to fix active alkali metal, thereby reducing volatile alkali metal content, which solves the problem that the boiler cannot operate safely and stably for a long time due to severe coking on the heating surface of the boiler

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