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A supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system

A technology for carbon dioxide and coal-fired boilers, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve problems such as insufficient denitrification, achieve the effects of reducing NOx generation, good denitrification effect, and improved efficiency

Active Publication Date: 2022-06-21
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention overcomes the deficiency of insufficient denitrification degree due to high temperature of supercritical carbon dioxide coal-fired boilers, and provides an integrated system for denitrification, desulfurization and dust removal of supercritical carbon dioxide coal-fired boilers, which can combine the hierarchical denitrification process in the furnace with the dust removal, desulfurization and denitrification process. Flue gas circulation denitrification realizes the integration of desulfurization, dust removal and denitrification

Method used

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  • A supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system
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  • A supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system

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Embodiment 1

[0038] An integrated system for denitration, desulfurization and dust removal of a supercritical carbon dioxide coal-fired boiler in this embodiment. The boiler is a supercritical carbon dioxide coal-fired boiler. Compared with water vapor, supercritical carbon dioxide has a higher energy density, so the flame temperature in the high temperature region produced by the boiler is also higher. For ordinary steam boilers, the NOx content in the furnace is also higher than that of ordinary boilers. The invention combines the three-stage ammonia injection denitrification process with the dust removal, desulfurization and denitrification process to form a circulating denitration system, thereby realizing the deep denitrification of the supercritical carbon dioxide coal-fired boiler.

[0039] Specifically, combining figure 1 , A supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system in this embodiment includes a boiler unit 1...

Embodiment 2

[0059] The structure of an integrated system for denitration, desulfurization and dust removal of a supercritical carbon dioxide coal-fired boiler in this embodiment is basically the same as that in Embodiment 1. Further, in this embodiment, a high-temperature dust collector 211 is also provided before the selective catalytic reduction device 212 , The flue gas is dedusted and filtered by the high temperature dust collector 211 and then enters the selective catalytic reduction device 212 for deep denitrification. Preferably, the high-temperature dust collector 211 adopts a high-temperature ceramic tube, and the ceramic tube can also be replaced with a metal mesh, or the ceramic tube and the metal mesh can be mixed.

[0060] In this embodiment, the dust removal and denitration unit 200 further includes a high temperature air preheater 210 and a low temperature air preheater 213. The high temperature air preheater 210 is arranged between the boiler unit 100 and the high temperatu...

Embodiment 3

[0066] The structure of an integrated system for denitrification, desulfurization and dust removal of a supercritical carbon dioxide coal-fired boiler in this embodiment is basically the same as that in Embodiment 1. Further, in this embodiment, the desulfurization unit 300 includes a heat recovery device 310, a wet desulfurization unit 310, and a wet desulfurization unit connected in sequence. The tower 311, the wet electrostatic precipitator 312 and the reheater 313, the heat recovery device 310 and the reheater 313 are also connected through the circulating working medium pipe, and the flue gas after the SCR deep denitrification is preheated by the low temperature air and enters the desulfurization unit 300. The temperature of the flue gas after the cooling treatment is 70-90° C., and then entering the wet desulfurization tower 311 for desulfurization treatment can ensure the desulfurization effect.

[0067] After the flue gas is desulfurized, it enters the wet electrostatic...

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Abstract

The invention discloses a supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system, which belongs to the technical field of NOx emission reduction. The boiler unit of the present invention is equipped with a multi-stage ammonia injection denitrification device to realize graded denitrification in the furnace, and the dust removal and denitrification unit can denitrify and remove dust again through selective catalytic reduction reaction; the combustion in the low-temperature flue gas recirculation mode can effectively reduce the temperature in the furnace and reduce the Thermal NOx generation reduces the concentration of NOx emitted from the furnace tail. At the same time, because the oxygen concentration of the recirculated flue gas is reduced, it is beneficial to meet the annular high-temperature and low-oxygen reduction zone formed by the ammonia injection burner, thereby realizing the deep denitrification of supercritical carbon dioxide coal-fired boilers. . The invention overcomes the insufficient denitrification degree caused by the high temperature of the supercritical carbon dioxide coal-fired boiler, can combine the three-stage ammonia injection denitrification process with the dust removal desulfurization and denitrification process, and denitrifies the flue gas cycle, realizing the integration of desulfurization, dust removal and denitrification.

Description

technical field [0001] The invention belongs to the technical field of NOx emission reduction, and more particularly relates to an integrated system for denitration, desulfurization and dust removal of a supercritical carbon dioxide coal-fired boiler. Background technique [0002] In the coal-fired power generation boiler system with water as the circulating working fluid, 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 than water vapor, and because its energy density is larger than that of water, according to the high temperature resistance level of existing steel, the effi...

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
CPCB01D53/75B01D53/76B01D53/56B01D53/8634B01D53/50B03C3/16F23J15/02F23J15/022B01D2258/0283B01D2251/2062
Inventor 林郁郁顾明言汪嘉伦
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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