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A method for denitrification without ammonia in a circulating fluidized bed coal-fired boiler furnace

A circulating fluidized bed, coal-fired boiler technology, applied in fluidized bed combustion equipment, combustion methods, chemical instruments and methods, etc., can solve the problem of high carbon content in bottom slag and fly ash, easy corrosion and coking of boilers and flues , low combustion efficiency and other problems, to achieve the effect of high carbon content, preventing mutual agglomeration and reducing emissions

Active Publication Date: 2020-11-27
YANKUANG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the escape of ammonia in the denitrification of existing circulating fluidized bed boilers, and the combustion of anthracite in circulating fluidized bed boilers, the bottom slag and fly ash have high carbon content, low combustion efficiency, and easy corrosion and coking in boilers and flues etc., the present invention provides an ammonia-free denitrification method in a circulating fluidized bed coal-fired boiler

Method used

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  • A method for denitrification without ammonia in a circulating fluidized bed coal-fired boiler furnace
  • A method for denitrification without ammonia in a circulating fluidized bed coal-fired boiler furnace

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Embodiment 1

[0049] This embodiment provides a method for denitrification without ammonia in a circulating fluidized bed coal-fired boiler furnace, such as figure 1 As shown, the circulating fluidized bed coal-fired boiler includes a circulating fluidized bed coal-fired boiler 1, a cyclone separator 2, and a feeder 3 connected in sequence, and the anthracite with an average particle size of 500 μm to 550 μm is dispersed and sprayed by powder The system enters the furnace body from the secondary air outlet 4 of the furnace body of the circulating fluidized bed coal-fired boiler 1, and the tertiary air inlet 5 is set at the entrance of the cyclone separator 2, and the material in the return device 2 returns to the circulating fluidized bed coal-fired boiler. the furnace body of the boiler 1;

[0050] The powder dispersion and injection system includes a powder fluidization device 6, a high-pressure air flow dispersion device 7, an electrostatic dispersion device 8, and a powder output 9; whe...

Embodiment 2

[0058] This embodiment provides an ammonia-free denitrification method in a circulating fluidized bed coal-fired boiler, wherein the circulating fluidized bed coal-fired boiler includes a circulating fluidized bed coal-fired boiler, a cyclone separator and a feeder connected in sequence, Anthracite with an average particle size of 570 μm ~ 600 μm is passed into the furnace body from the secondary air port of the furnace body of the circulating fluidized bed coal-fired boiler through conventional injection means (such as using a Laval nozzle), and three times are set at the entrance of the cyclone separator. The air inlet, the material in the return device returns to the furnace body of the circulating fluidized bed coal-fired boiler.

[0059] By adopting the method described in this embodiment, the denitrification efficiency of the circulating fluidized bed boiler can reach 26%, and the burnout rate of coal can reach more than 94%.

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Abstract

The invention provides a non-ammonia denitration method in a furnace body of a circulation fluidized bed coal fired boiler. The circulation fluidized bed coal fired boiler includes a circulation fluidized bed coal fired boiler body, a cyclone separator and a back feeder, wherein the circulation fluidized bed coal fired boiler body, the cyclone separator and the back feeder are sequentially connected, anthracite is introduced the furnace body from a secondary air inlet of the furnace body of the circulation fluidized bed coal fired boiler, a tertiary air inlet is formed in the entrance of the cyclone separator, and materials in the back feeder are returned into the furnace body of the circulation fluidized bed coal fired boiler. According to the non-ammonia denitration method, anthracite duff with an appropriate particle size is selected and is introduced the circulation fluidized bed coal fired boiler at an appropriate position, sufficient burning is achieved in the circulation fluidized bed coal fired boiler, and the burn-out rate and the burning efficiency are improved.

Description

technical field [0001] The invention relates to the field of circulating fluidized bed boilers, and relates to an ammonia-free denitrification method in a circulating fluidized bed coal-fired boiler. Background technique [0002] In circulating fluidized bed boilers, NO x The more mature removal technologies are mainly divided into two types, that is, the control of NO in the combustion process x generation and post-combustion control. [0003] NO in the combustion process x The control mainly adopts advanced low NO x Combustion technology mainly includes: ① air staged combustion; ② low oxygen combustion; ③ fuel staged combustion technology; ④ flue gas recirculation technology; x burner. [0004] Control NO after combustion x There are two main types of technologies, namely SCR (Selective Catalytic Reduction) and SNCR (Selective Non-Catalytic Reduction). [0005] NO removal in combustion x The advanced technology can achieve high denitrification efficiency, and the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/00F23C10/22F23K1/00B01D53/56B01D53/76B01D53/83
Inventor 王海苗宋令坡谭波司硕杨晓辉刘忠攀卢晓明
Owner YANKUANG GRP CO LTD
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