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Coal-fired boiler self-denitration system and method

A coal-fired boiler and self-detachment technology, which is applied in the direction of combustion methods, chemical instruments and methods, and separation methods, can solve problems such as restricting applications, and achieve the effects of saving operating costs, improving atmospheric environmental quality, and significant environmental and social benefits

Pending Publication Date: 2022-07-12
XIAN THERMAL POWER RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In coal-fired power plant boilers, the combustion control is based on the oxygen and CO content at the furnace outlet as the control indicators, and the CO content at the furnace outlet needs to be controlled at a low level, which restricts the application of CO-SCR technology

Method used

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  • Coal-fired boiler self-denitration system and method

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with specific embodiments, which are to explain rather than limit the present invention.

[0026] The present invention proposes a system and method for reducing NOx by using CO generated by low-oxygen combustion of a boiler, and replacing an external reducing agent to realize self-denitrification of boiler combustion. The stroke gradually reduces NOx, while improving the fineness of pulverized coal, setting up flue gas recirculation to reduce the heat loss of incomplete combustion, and adding wall-mounted air nozzles between the burners of each layer to alleviate the high temperature corrosion of the water wall, and finally in the SCR reactor. Replace and install CO catalyst to achieve CO burnout;

[0027] like figure 1 As shown in the figure, a self-denitrification system for a coal-fired boiler includes a burner 3, a wall-mounted air nozzle 4, a boiler 5, an exhaust air nozzle 8 and an SC...

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Abstract

According to the coal-fired boiler self-denitration system and method, the total excess air coefficient is reduced, the proportion of over fire air is increased, high-concentration CO is generated, NOx is gradually reduced along the flue gas stroke, meanwhile, the fineness of pulverized coal is increased, flue gas recirculation is set, and therefore incomplete combustion heat loss is reduced; wall-attached air nozzles are additionally arranged between the combustors on all layers to relieve high-temperature corrosion of the water cooling wall, and finally CO is burnt out by replacing and installing a CO catalyst in the SCR reactor; according to the boiler combustion self-denitration method, under the condition that an external reducing agent ammonia is not used, the boiler flue gas NOx emission is smaller than 50 mg / m < 3 >, the CO emission concentration is smaller than 50 ppm, and the boiler efficiency is not reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification in thermal power plants, in particular to a self-denitrification system and method for a coal-fired boiler. Background technique [0002] At present, the ultra-low emission standard of NOx for domestic coal-fired units is 50mg / m2 3 , The denitration technology route adopted by most pulverized coal boilers is low nitrogen combustion + SCR technology. The low-nitrogen combustion technology reduces NOx at the furnace outlet through measures in the furnace such as air classification and thick-lean combustion. The low-nitrogen combustion technology has a small investment, but has a low denitration efficiency and a great impact on the boiler operation. It has been rapidly developed and widely used in recent years, but it is close to the technical limit. SCR technology adds NH to the flue gas after the economizer at the end of the boiler 3 As a reducing agent, flue gas denitrification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/08F23C7/02F23C9/06F23L15/00B01D53/86B01D53/56B01D53/62
CPCF23C5/08F23C7/02F23C9/06F23L15/00B01D53/8625B01D53/864B01D2257/502B01D2258/0283Y02E20/34
Inventor 张向宇张波刘雯陆续向小凤王志超杜智华徐宏杰姚伟
Owner XIAN THERMAL POWER RES INST CO LTD