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Catalytic removal device for NOx and CO in tail flue of pi-shaped pulverized coal boiler

A tail flue and pulverized coal boiler technology, which is applied in lighting and heating equipment, combustion product treatment, combustion methods, etc., can solve the problems of boiler efficiency reduction and low investment in transformation, and achieve secondary pollution and easy replacement and transformation , The effect of reducing CO and NOx emissions

Active Publication Date: 2017-01-11
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a kind of π-type pulverized coal boiler tail flue NOx and CO catalytic removal device, which does not use heavy metal oxide catalysts that are prone to secondary pollution and does not affect the boiler. The normal operation does not increase the operating cost, and the transformation investment is low. With the low-oxygen combustion technology, the nitrogen oxide emission at the tail flue outlet is effectively reduced, and the problem of boiler efficiency decline that is prone to occur in low-nitrogen combustion is solved. It can be used in existing π-type The environmental protection transformation of pulverized coal boilers can also be used in the design of new π-type pulverized coal boilers

Method used

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  • Catalytic removal device for NOx and CO in tail flue of pi-shaped pulverized coal boiler
  • Catalytic removal device for NOx and CO in tail flue of pi-shaped pulverized coal boiler

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Embodiment 1

[0029] Such as figure 1 As shown, in this embodiment, a π-type pulverized coal boiler tail flue NOx and CO catalytic removal device includes a π-type pulverized coal boiler tail flue 1, a panel heating surface 2, a deflector 3, and a rectifying grid 4 , active catalytic material 5, low temperature reheater 6, low temperature superheater 7, etc. The active catalytic material 5 is arranged upstream of the heating surface of the low-temperature reheater 6 and upstream of the heating surface of the low-temperature superheater 7, in the form of a honeycomb, and its main component is 12Cr2MoWVTiB. Using low-oxygen combustion technology, the CO concentration in the flue gas at the two places on the panel heating surface is 3000ppm, and the NO concentration is 200ppm. After catalytic reaction, the CO emission concentration is reduced to 100ppm, and the NO emission concentration is reduced to 70ppm.

Embodiment 2

[0031] Such as figure 2 As shown, in this embodiment, a π-type pulverized coal boiler tail flue NOx and CO catalytic removal device includes a π-type pulverized coal boiler tail flue 1, a panel heating surface 2, a deflector 3, and a rectifying grid 4 , active catalytic material 5, low temperature superheater 6, low temperature reheater 7, etc. The tail flue of the π-type pulverized coal boiler is divided into front and rear double flues. There is a low-temperature reheater 7 in the flue near the front of the furnace, and a low-temperature superheater 6 in the flue near the rear of the furnace. The rectifying grid 4 and the active catalytic material 5 are also divided into two parts, which are respectively arranged in front of the heating surface of the low-temperature superheater 7 of the front flue and upstream of the heating surface of the low-temperature reheater 6 of the rear flue. The active catalytic material 5 is in the form of a corrugated plate, and its main compon...

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Abstract

The invention discloses a catalytic removal device for NOx and CO in a tail flue of a pi-shaped pulverized coal boiler. The catalytic removal device comprises a shield-type heated surface, a flow guide plate, a flow straightening grid, an active catalytic material, a low-temperature reheater and a low-temperature superheater which are sequentially arranged in the tail flue of the pi-shaped pulverized coal boiler along the flow direction of smoke, wherein the active catalytic material is arranged by virtue of a space in the tail flue of the pi-shaped pulverized coal boiler, NOx is reduced by virtue of CO generated by low-oxygen combustion, and excessive CO is oxidized into CO2, thus the heat efficiency of the boiler is increased while the emission of NOx is effectively reduced. According to the catalytic removal device disclosed by the invention, a heavy-metal oxide catalyst which easily causing secondary pollution is not used, thus normal running of the boiler is not influenced, a running cost is not increased, and a reformation investment is low; the emission of nitrogen oxides at the outlet of the tail flue is effectively reduced in combination with a low-oxygen combustion technology, and meanwhile, the easily-caused problem of efficiency reduction of the boiler due to the low-oxygen combustion is solved; and the catalytic removal device can be used for both environment-friendly reformation for an existing pi-shaped pulverized coal boiler, and design for a newly-constructed pi-shaped pulverized coal boiler.

Description

technical field [0001] The invention relates to a NOx and CO catalytic removal device for a pulverized coal boiler, belonging to the technical field of coal-fired power generation and environmental protection. Background technique [0002] my country has decided to speed up the upgrading of coal-fired power plants and promote ultra-low emissions nationwide. Nitrogen oxides (NOx) are the main air pollutants in coal-fired power plants, and are also the focus of power plant pollutant control. [0003] The π-type pulverized coal boiler is the main structural form of power plant boilers in my country. The denitrification method of π-type pulverized coal boiler mainly adopts the process route of low nitrogen combustion technology combined with selective catalytic reduction denitrification technology (SCR). The denitrification efficiency of this technical route can reach 80-90%, but there are some problems in the process of use: [0004] (1) Low-nitrogen combustion increases the...

Claims

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Application Information

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IPC IPC(8): F23J15/02
CPCF23J15/02F23J2215/10F23J2215/40F23J2219/10
Inventor 蒋敏华肖平唐巍高洪培时正海黄中
Owner HUANENG CLEAN ENERGY RES INST
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