SCR denitration control system and method for coal-fired unit

Abstract

An embodiment of the present invention provides an SCR denitrification control system of a coal-fired unit, which belongs to the field of denitrification of a coal-fired unit. The SCR denitrification control system of the coal-fired unit includes: an instruction acquisition unit for obtaining a load reduction instruction, wherein the load reduction instruction is used to indicate that the coal-fired unit is in a load reduction condition; a detection unit for The load reduction command is used to detect the total amount of coal of the coal-fired unit; the adjustment unit is used to adjust the working status of one or more of the plurality of coal mills according to the total amount of coal, so that The coal amount of the coal pulverizer configured with the double air-regulating swirl burner is greater than a predetermined threshold. In this way, a large amount of NO caused by the insufficient coal supply of the dual air swirl burner during the load reduction process is avoided x The generation of ammonia can reduce the amount of ammonia injection in the SCR reactor during the load reduction operation, and correspondingly reduce the denitrification cost during the load reduction operation of the boiler.

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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