Flue gas denitration transformation method for coal-fired generating unit

A technology for the transformation of generator sets and denitration, which is applied in combustion methods, air quality improvement, combustion equipment, etc., and can solve the problems of not meeting nitrogen oxide emission standards and not having denitration devices

Inactive Publication Date: 2018-04-03
DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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Problems solved by technology

[0004] At present, the coal-fired generating units of domestic power plants have generally been in service for many years, and most of the original generating units do not have denitrification devices. However, with the improvement of environmental protection emission standards, the existin

Method used

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Embodiment Construction

[0031] Below in conjunction with the examples, the specific implementation of the present invention will be further described in detail. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] This embodiment provides a method for retrofitting flue gas denitrification of a coal-fired power generation unit. The method is described in detail by taking a 2×350MW domestic coal-fired power generation unit as an example. The model of the two main engine boilers of the unit is HG-1170 / 17.4-YM1. The two units are equipped with concentrated nitrogen burners, electrostatic precipitators and flue gas desulfurization devices (excluding GGH heat exchangers) simultaneously, but denitrification has not been built simultaneously. device.

[0033] The modification plan of the unit mainly includes:

[0034] (1) Technical transformation of denitrification device is installed, SCR denitrification technology ...

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Abstract

The invention belongs to the technical field of denitration transformation for power plants, and particularly relates to a flue gas denitration transformation method for a coal-fired generating unit.The method comprises the steps that according to the existing arrangement of the tail of a boiler, a SCR reactor is additionally arranged behind a BK shaft at the tail of the boiler, a SCR reactor isadditionally arranged above the inlet flue of an electric dust remover, and the SCR reactors are arranged in the mode of one boiler with two SCR reactors; flue gas is introduced into the SCR reactorsfrom the outlet horizontal flue of a coal economizer, NOx in the flue gas is removed under the combined action of ammonia and catalysts; and the purified flue gas subjected to the above treatment is introduced into an air preheater. According to the method, by adopting the SCR denitration process and transforming corresponding facilities of the boiler, the denitration efficiency is improved, the environment-friendly emission requirements of high standards are met, and the influence of coal burning on the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of denitrification transformation of power plants, and in particular relates to a method for transformation of flue gas denitrification of coal-fired generating sets. Background technique [0002] The environmental pollution caused by coal-based power production in my country is a restrictive factor for the development of the power industry. The flue gas produced by coal combustion contains pollutants such as soot, sulfur oxides (SOX), nitrogen oxides (NOX) and CO2, which have caused serious environmental problems and are important issues to be solved urgently for the sustainable development of my country's economy. [0003] Faced with increasingly higher environmental protection emission requirements and the tight supply of the coal market, power plants have found it difficult to maintain the stability of the coal quality of the unit for a long time. With the change of coal quality, the amount of flue gas p...

Claims

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Application Information

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IPC IPC(8): F23J15/00F23J15/02F23J3/00F23L15/04F23L17/00F23C7/00
CPCF23C7/00F23J3/00F23J15/006F23J15/02F23J2215/10F23J2219/10F23L15/04F23L17/005Y02A50/20Y02E20/34
Inventor 张宝军
Owner DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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