In-furnace denitrification system and in-furnace denitrification process of circulating fluidized bed boiler

A technology of circulating fluidized bed and boiler furnace, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., and can solve the problems of low investment and operation costs and high investment and operation costs of SNCR

Active Publication Date: 2019-02-19
ANHUI ELECTRICAL ENG PROFESSIONAL PROFESSIONAL TECHN COLLEGE +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SCR denitrification efficiency can reach 60-90%, and SNCR denitrification efficiency generally ranges from 30-60% (for small circulating fluidized bed boilers, the denitrification efficiency can reach 70%); Relatively low, and SNCR hardly increases system resistance

Method used

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  • In-furnace denitrification system and in-furnace denitrification process of circulating fluidized bed boiler

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Embodiment Construction

[0011] In order to further describe the circulating fluidized bed boiler furnace denitrification system and the furnace denitrification process of the present invention, it will be further described below in conjunction with the accompanying drawings.

[0012] figure 1 A circulating fluidized bed boiler denitrification system shown in the furnace includes a boiler 11 and a sequentially connected urea silo 1, metering silo 2, batching tank 5, first delivery pump 6, urea solution storage tank 7, and mixer 8 , the second delivery pump 9, injector 10, the steam inlet pipe 3 communicates with the batching tank 5, the injector 10 respectively, and the tap water inlet pipe 4 communicates with the outlet end of the batching tank 5, the mixer 8 and the first delivery pump 6 respectively.

[0013] In the circulating fluidized bed boiler furnace denitrification process of the present invention, the initial NO x The concentration is 250mg / Nm 3 (dry basis, 6% O 2 , to NO 2 total), expo...

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Abstract

The invention relates to the technical field of circulating fluidized bed boiler denitration, in particular to an in-furnace denitration system and an in-furnace denitration technology of a circulating fluidized bed (CFB) boiler. The in-furnace denitration system of the circulating fluidized bed boiler comprises a boiler, and a urea feed bin, a measuring bin, a blending pool, a delivery pump, a urea solution storage tank, a mixer and the like which are sequentially connected; a steam inlet pipe is respectively communicated with the blending pool and an ejector; a tap water inlet pipe is respectively communicated with the blending pool, the mixer and an outlet end of the first delivery pump. Urea is taken as a reducing agent when the temperature of a hearth is within the temperature range of 850-1050 DEG C, and the urea is selectively subjected to a chemical reaction with nitric oxide NOx in the flue gas of the boiler in absence of a catalyst so as to generate harmless nitrogen and water, so that the NOx in the flue gas is removed. The in-furnace denitration system and the in-furnace denitration technology are suitable for a deep denitration technology for reforming the CFB boiler, have the advantages of being low in technology investment and operating cost, simple and convenient to install and reform, and the like, do not need the catalyst, and meet the latest environmental protection standard.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boiler denitrification, in particular to an in-furnace denitrification system and an in-furnace denitrification process of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed (CFB) boilers have the advantages of low cost of pollutant emission control and wide fuel adaptability, and have been rapidly developed in the world and in my country in the past thirty years. However, affected by factors such as changes in coal quality, poor operation control and unstable equipment, the environmental protection characteristics of CFB boilers have not been fully utilized. The promulgation of the new environmental protection standard puts forward higher requirements for the combustion product emissions of CFB boilers. Some existing CFB boiler units in my country SO 2 and NO x The emissions cannot meet the requirements of the latest environmental prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2067
Inventor 何鹏
Owner ANHUI ELECTRICAL ENG PROFESSIONAL PROFESSIONAL TECHN COLLEGE
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