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A supercritical carbon dioxide coal-fired boiler deep denitrification process

A technology for carbon dioxide and coal-fired boilers, applied in chemical instruments and methods, separation methods, lighting and heating equipment, etc., can solve the problems of lowering the temperature in the furnace and insufficient denitrification, and achieve lowering the temperature in the furnace and reducing thermal NOx Generate and improve efficiency

Active Publication Date: 2021-02-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention overcomes the deficiency of insufficient denitrification degree caused by high temperature of supercritical carbon dioxide coal-fired boilers. The three-stage ammonia injection denitrification process realizes deep graded denitrification in the furnace, and the recirculation combustion of low-temperature flue gas effectively reduces the temperature in the furnace, reduces the generation of thermal NOx, and realizes Deep denitrification of supercritical carbon dioxide coal-fired boiler

Method used

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  • A supercritical carbon dioxide coal-fired boiler deep denitrification process
  • A supercritical carbon dioxide coal-fired boiler deep denitrification process
  • A supercritical carbon dioxide coal-fired boiler deep denitrification process

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Embodiment 1

[0042] A supercritical carbon dioxide coal-fired boiler deep denitrification process in this embodiment, the boiler is a supercritical carbon dioxide coal-fired boiler, supercritical carbon dioxide has a higher energy density than water vapor, so the flame temperature in the high-temperature zone produced by it is also higher than that of ordinary water For steam boilers, the NOx content in the furnace is also higher than that of ordinary boilers.

[0043] combine figure 1 The three-stage ammonia injection denitrification process in this embodiment is specifically: use the ammonia injection burner 110 to inject fuel and amino reducing agent into the main combustion area of ​​the burner in the supercritical carbon dioxide coal-fired boiler, and form a temperature of 850-1400 ° C Ring-shaped high-temperature and low-oxygen reduction zone 116, where amino reducing agent and flue gas in the furnace undergo a reduction reaction to achieve primary denitrification; secondary ammonia ...

Embodiment 2

[0061]A supercritical carbon dioxide coal-fired boiler deep denitrification process in this embodiment, its steps are basically the same as in Embodiment 1, further, in this embodiment, after the three-stage denitrification in the furnace, the dust removal and denitrification unit 200 and the temperature is 350-400 °C The flue gas is subjected to high-temperature dust removal treatment, and the flue gas after dust removal is then subjected to SCR deep denitrification. Preferably, the dust removal and denitrification unit 200 in this embodiment performs two-stage air preheating and cooling treatment on the flue gas after the three-stage denitrification in the furnace. The two-stage air preheating process includes high-temperature air preheating before high-temperature ceramic dust removal and SCR deep denitrification After the low temperature air is preheated.

[0062] Specifically in this embodiment, the dedusting and denitration unit 200 includes a high-temperature air prehea...

Embodiment 3

[0068] A supercritical carbon dioxide coal-fired boiler deep denitrification process in this embodiment, its steps are basically the same as in Embodiment 1, further, the desulfurization unit 300 in this embodiment includes a heat recovery device 310, a wet desulfurization tower 311, Wet electrostatic precipitator 312 and reheater 313, heat recovery unit 310 and reheater 313 are also connected through circulating working fluid pipes, and the flue gas after SCR deep denitration is preheated by low-temperature air and then enters the heat recovery unit in desulfurization unit 300 Further cooling treatment in 310, the temperature of the flue gas after the cooling treatment is 70-90°C, at this time, entering the wet desulfurization tower 311 for desulfurization treatment can ensure the desulfurization effect.

[0069] After desulfurization treatment, the flue gas enters the wet electrostatic precipitator 312 for dust removal treatment. The heat absorbed by the heat recovery device ...

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Abstract

The invention discloses a deep denitrification process for a supercritical carbon dioxide coal-fired boiler, which belongs to the technical field of NOx emission reduction. The present invention includes three-stage ammonia injection denitrification: the ammonia injection burner is used to inject fuel and ammonia reductant to the main combustion area of ​​the burner in the furnace respectively to form an annular high-temperature and low-oxygen reduction area with a temperature of 850-1400°C, where the reduction reaction takes place Realize the first-level denitrification; the second-level ammonia injection device and the third-level ammonia injection device spray ammonia reductant to the main combustion zone above the high-temperature and low-oxygen reduction zone and the burnout zone after the burn-out air to realize the second-level and third-level denitrification; dust removal Desulfurization and denitrification: After the flue gas is denitrated by SCR in the dust removal and denitrification unit, it is cooled to 70-90°C and then sent to the furnace for cyclic denitrification treatment. The present invention overcomes the deficiency of insufficient denitrification degree caused by high temperature of supercritical carbon dioxide coal-fired boilers. The three-stage ammonia injection denitrification process realizes deep graded denitrification in the furnace, and the recirculation combustion of low-temperature flue gas effectively reduces the temperature in the furnace, reduces the generation of thermal NOx, and realizes Supercritical carbon dioxide coal-fired boiler deep denitrification.

Description

technical field [0001] The invention belongs to the technical field of NOx emission reduction, and more specifically relates to a deep denitrification process of a supercritical carbon dioxide coal-fired boiler. Background technique [0002] In the coal-fired power generation boiler system where water is used as the circulating working medium, the heat transfer characteristics of water vapor cannot meet the current needs. Therefore, it is necessary to continuously improve the parameters such as high temperature and high pressure of water vapor to improve the cycle efficiency, and at the same time bring higher performance to the steel. requirements. Due to the special physical properties of supercritical carbon dioxide, it has the advantages of smaller power generation system and floor space compared with water vapor, and because its energy density is higher than that of water, according to the existing high temperature resistance level of steel, the efficiency of supercritic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/56B01D53/86B01D53/50B03C3/16F23J15/02
CPCB01D53/50B01D53/56B01D53/75B01D53/76B01D53/8634B01D2251/2062B01D2258/0283B03C3/16F23J15/02F23J15/022
Inventor 林郁郁顾明言汪嘉伦
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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