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Boiler fly ash after-combustion device and method

A fly ash reburning and boiler technology, which is applied in the boiler field to achieve the effects of reducing ammonia escape, reducing ammonia water consumption, and reducing original emissions

Inactive Publication Date: 2020-01-17
山东福宽生物工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a boiler fly ash reburning device and method to solve the problem of increasing the amount of circulating ash proposed in the above background technology

Method used

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  • Boiler fly ash after-combustion device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] refer to figure 1 , a boiler fly ash recombustion device, comprising a boiler 5, the upper end of the boiler 5 communicates with a cyclone separator 7, the gas outlet end of the cyclone separator 7 is connected with the auxiliary heating surface of the boiler 5, and the auxiliary heating surface The lower end is connected with the electrostatic precipitator 1, the ash outlet of the electrostatic precipitator 1 is connected with the fly ash device, the fly ash device is connected with the ash storage room, and the fly ash device is also connected with the material of the return box. The legs are connected, the material legs of the return box are connected with the furnace of the boiler 5, and the lower end of the return device is connected with the return fan 9.

[0019] The auxiliary heating surface includes a superheater 2, an economizer 3 and an air preheater 4, and the superheater 2, the economizer 3 and the air preheater 4 are connected in sequence, wherein the supe...

Embodiment 2

[0023] refer to figure 1 , a boiler fly ash recombustion device, comprising a boiler 5, the upper end of the boiler 5 communicates with a cyclone separator 7, the gas outlet end of the cyclone separator 7 is connected with the auxiliary heating surface of the boiler 5, and the auxiliary heating surface The lower end is connected with the electrostatic precipitator 1, the ash outlet of the electrostatic precipitator 1 is connected with the fly ash device, the fly ash device is connected with the ash storage room, and the fly ash device is also connected with the material of the return box. The legs are connected, the material legs of the return box are connected with the furnace of the boiler 5, and the lower end of the return device is connected with the return fan 9.

[0024] The auxiliary heating surface includes a superheater 2, an economizer 3 and an air preheater 4, and the superheater 2, the economizer 3 and the air preheater 4 are connected in sequence, wherein the supe...

Embodiment 3

[0028] refer to figure 1 , a boiler fly ash recombustion device, comprising a boiler 5, the upper end of the boiler 5 communicates with a cyclone separator 7, the gas outlet end of the cyclone separator 7 is connected with the auxiliary heating surface of the boiler 5, and the auxiliary heating surface The lower end is connected with the electrostatic precipitator 1, the ash outlet of the electrostatic precipitator 1 is connected with the fly ash device, the fly ash device is connected with the ash storage room, and the fly ash device is also connected with the material of the return box. The legs are connected, the material legs of the return box are connected with the furnace of the boiler 5, and the lower end of the return device is connected with the return fan 9.

[0029] The auxiliary heating surface includes a superheater 2, an economizer 3 and an air preheater 4, and the superheater 2, the economizer 3 and the air preheater 4 are connected in sequence, wherein the supe...

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Abstract

The invention discloses a boiler fly ash after-combustion device, and relates to the technical field of boilers. The upper end of a boiler communicates with cyclone separators, the cyclone separatorsare connected with an auxiliary heating face of the boiler, the lower end of the auxiliary heating face communicates with an electrostatic dust collector, the electrostatic dust collector communicateswith fly ash devices, the fly ash devices are connected with return boxes, legs of the return boxes are connected with a boiler hearth, and a return device is connected with a return fan. Boiler flyash collected down by the electrostatic dust collector is returned to return device legs of the boiler through the fly ash devices, the boiler fly ash jointly enters the hearth together with return ash to participate in combustion, the circular ash amount in the hearth is increased, the bed temperature is reduced, the hearth difference pressure is improved, the hearth outlet temperature is improved, the fly ash carbon containing amount is reduced, the application range of the boiler to the coal type can be widened, through control over the fly ash returning amount, the temperature reaction section of ammonium hydroxide is achieved, ammonium hydroxide makes sufficient reaction with nitric oxide in smoke, and escape of ammonia is reduced.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler fly ash reburning device and method. Background technique [0002] Nowadays, the design of circulating fluidized bed boilers in thermal power plants is generally low bed temperature, low bed pressure, low nitrogen combustion domestic new furnace type, the original emission of nitrogen oxides is 70-160mg / m 3 , the Nox emission standard implemented before October 2017 is ≤200mg / m 3 . During this period, the flue gas emission requirements can be met without the use of SNCR ammonia water denitrification method. After October 2017, environmental protection departments in many regions implemented ultra-low emission standards, and the NOx emission standard was ≤50mg / m 3 ; In order to meet the emission standards, the boiler adopts SNCR denitrification method, and the denitrification agent is generally ammonia water or urea. The designed consumption of ammonia water is genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/00F23C10/26F23L15/04
CPCF23C10/00F23C10/26F23L15/04Y02E20/34
Inventor 赵树平王建军胡忠张贞元田晓飞汪飞郝广利王继胜周涛
Owner 山东福宽生物工程有限公司
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