SCR denitration control system and method of coal-fired unit

Abstract

The embodiment of the invention provides an SCR denitration control system of a coal-fired unit and belongs to the field of coal-fired unit denitration. The SCR denitration control system of the coal-fired unit comprises an instruction acquiring unit, a detecting unit and an adjusting unit. The instruction acquiring unit is used for acquiring a load reducing instruction, wherein the load reducinginstruction is used for indicating that the coal-fired unit is in the working condition of load reduction. The detecting unit is used for detecting the total coal amount related with the coal-fired unit according to the load reducing instruction. The adjusting unit is used for adjusting the work operation state of one or more of multiple coal mills according to the total coal amount, so that the coal amount of the coal mills provided with bi-register turbulent burners is larger than a preset threshold value. Therefore, the situation that a large amount of NOx is generated due to the fact thatthe coal feed of the bi-register turbulent burners is insufficient in the load reducing process is avoided, the ammonia spraying amount of an SCR reactor is reduced in the process of load reducing operation, and the denitration cost in the load reducing operation process of a boiler is reduced accordingly.

Description

technical field [0001] The invention relates to the field of denitrification control of a coal-fired unit, in particular to an SCR denitrification control system and method for a coal-fired unit. Background technique [0002] As my country's environmental protection policy requirements are increasing year by year, the NO in the flue gas emitted by thermal power units x (nitrogen oxides) have been included in strict supervision, and the flue gas denitrification technology of Selective catalytic reduction (SCR) has been adopted because of its high denitrification rate, reliable technology, simple structure and small ammonia gas escape rate. Become a coal-fired power plant boiler control NO x The main choice for emissions. [0003] A domestic 600MW boiler is a Π-type boiler with supercritical, spiral furnace, one intermediate reheat, balanced ventilation, solid slag discharge, all-steel structure, and open-air layout produced according to the technical standards of SWUP serie...

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Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide an SCR denitrification control system and method for a coal-fired unit to at least solve the technical problem of a surge in the amount of ammonia injection caused by the boiler after the burner is replaced during the load-reduction operation process

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