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Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging

A technology of circulating fluidized bed and air classification, which is applied in the field of circulating fluidized bed, can solve the problems of not adopting fuel classification combustion technology, the boiler cannot produce natural gas, and the price of natural gas is high, so as to reduce emissions, ensure combustion efficiency and low cost Effect

Active Publication Date: 2015-09-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods use natural gas as the reburning gas in fuel staged combustion, but the boiler itself cannot produce natural gas, and the price of natural gas is high, which greatly increases the operating cost
[0004] At present, the denitrification technologies used in circulating fluidized beds are mainly air staged combustion technology and furnace SNCR technology, and fuel staged combustion technology is not used.

Method used

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  • Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging
  • Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging

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specific Embodiment approach 1

[0021] Specific implementation mode one: as figure 1 and figure 2 As shown, air staging and fuel staging are coupled to control circulating fluidized bed NO x The device includes a furnace body 5, a cyclone separator 6, a return valve 8, and a connecting pipe 16; the furnace body 5 is a circulating fluidized bed, and it is characterized in that: the air classification and the fuel classification are coupled to control the circulating flow BNO x The device also includes gasification chamber 9 and gasification chamber air chamber 10;

[0022] The lower part of the furnace body 5 is the main bed air chamber 2, the bottom of the furnace body 5 is provided with the main bed primary tuyere 1-2, and the lower part of the front wall of the furnace body 5 is located above the main bed air chamber 2 to arrange a primary fuel feeding port 3. The lower secondary tuyere 4-1 is arranged on the furnace body 5 above the primary fuel feeding port 3, and the upper secondary tuyere 4-2 is ar...

specific Embodiment approach 2

[0024] Specific implementation mode two: as figure 1 As shown, the coupling of air staging and fuel staging described in the first specific embodiment controls the circulating fluidized bed NO x device, the air staging and fuel staging are coupled to control circulating fluidized bed NO x The device also includes an SNCR denitration device 13; the SNCR denitration device 13 is installed at the outlet of the burnout zone C of the furnace body 5.

[0025] In this embodiment, since the SNCR denitrification device 13 is installed at the outlet of the burnout zone C of the body of furnace 5, urea is used as a reducing agent, and the urea aqueous solution is atomized from the separator 6 inlet and then sprayed into the flue. 6 Intensely mixed with flue gas to further reduce NO x emissions, can make the final NO x Emissions below 50mg / m 3 .

specific Embodiment approach 3

[0026] Specific implementation mode three: as figure 1 and figure 2 As shown, using the device described in the first or second embodiment to realize the coupling of air staging and fuel staging to control circulating fluidized bed NO x The method for discharging, described method comprises the steps:

[0027]Step 1: Add secondary fuel into the secondary fuel feeding port 7, the secondary fuel is fine coal particles with a particle size less than 1mm, and the high-temperature circulating material separated by the secondary fuel and the cyclone separator 6 Fully mixed in the chemical chamber 9; the temperature of the high-temperature circulating material is 850~950°C;

[0028] Step 2: Introduce air or steam or air plus steam from the bottom of the gasification chamber 9 as the fluidization medium of the gasification chamber 9, and fluidize the mixture of the high-temperature circulating material and the secondary fuel entering the gasification chamber 9 well, Gas is generat...

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Abstract

The invention relates to a device and a method for controlling NOx discharge of a circulating fluidized bed by coupling air staging and fuel staging, and belongs to the technical field of circulating fluidized beds. According to the device and the method, the fuel staging and the air staging are combined, fuel gas generated by the circulating fluidized bed is taken as reburning gas, so that the cost is low, and the NOx discharge during running process of the circulating fluidized bed is effectively reduced. A vaporizing chamber and an air chamber of the vaporizing chamber are arranged outside the rear wall of a furnace body, a fuel gas inlet communicated with the furnace body and the vaporizing chamber is formed in the rear wall of the furnace body, a burn-out area outlet of the furnace body is communicated with a cyclone separator, the bottom of the cyclone separator is communicated with the vaporizing chamber through a return valve and a connecting pipe. Secondary fuel is added to a material inlet, and is mixed with a high-temperature circulating material in the vaporizing chamber to obtain a mixed material; air is supplied to the vaporizing chamber from the bottom of the vaporizing chamber, the mixed material is fluidized, the generated fuel gas enters the furnace body, a reburning area with a reducing atmosphere is formed at the upper end of a main combustion area, and NOx generated in the main combustion area is reduced into N2. The device and the method are used for controlling the NOx discharge of the coal-fired circulating fluidized beds.

Description

technical field [0001] The invention relates to a method for controlling NO in a circulating fluidized bed x The device and method for discharging belong to the technical field of circulating fluidized bed. Background technique [0002] Pollutant gases emitted by boilers in coal-fired power plants mainly include SO x , NO x etc. With the rapid development of my country's economy and the increasing requirements for environmental protection, the NO x Effective control of emissions not only has significant environmental benefits, but also has significant economic and social benefits. It is an environmental problem that needs to be solved urgently. [0003] NO x Emission reduction methods are mainly divided into two categories: low NO in the furnace x Combustion technology (NO suppression in the furnace x generation) and flue gas denitrification technology (reducing the generated NO at the tail x ). Existing low NO x Combustion technology mainly includes: low NO x Burn...

Claims

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Application Information

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IPC IPC(8): F23C10/10F23C10/28F23J15/02
CPCF23C10/10F23C10/20F23C10/22F23C2201/30F23J15/02F23J2215/10
Inventor 别如山房点别海培宋兴飞纪晓瑜陈佩李鹏坤
Owner HARBIN INST OF TECH
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