Deep denitration process for supercritical carbon dioxide coal-fired boiler

A carbon dioxide, coal-fired boiler technology, 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, so as to reduce the temperature in the furnace and reduce the thermal NOx. The effect of generating, good denitration effect

Active Publication Date: 2020-07-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 denitrif

Method used

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  • Deep denitration process for supercritical carbon dioxide coal-fired boiler
  • Deep denitration process for supercritical carbon dioxide coal-fired boiler
  • Deep denitration process for supercritical carbon dioxide coal-fired boiler

Examples

Experimental program
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Example Embodiment

[0041] Example 1

[0042] In this embodiment, a supercritical carbon dioxide coal-fired boiler deep denitration process. 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 of the high-temperature zone produced is higher than that of ordinary water. Steam boilers have higher NOx content than ordinary boilers.

[0043] Combine figure 1 In this embodiment, the three-stage ammonia injection denitrification process is specifically as follows: the ammonia injection burner 110 is used to inject fuel and amino reductant into the main combustion zone of the burner in the supercritical carbon dioxide coal-fired boiler to form a temperature of 850-1400 ℃ Annular high-temperature and low-oxygen reduction zone 116, where the amino reducing agent and furnace flue gas undergo a reduction reaction to achieve the first-stage denitrification; the second-stage ammonia injection d...

Example Embodiment

[0060] Example 2

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

[0062] Specifically, in this embodiment, the dust removal and denitration unit 200 includes a high-temperature air preheater 2...

Example Embodiment

[0067] Example 3

[0068] In this embodiment, a supercritical carbon dioxide coal-fired boiler deep denitration process, and its steps are basically the same as those in Embodiment 1. Further, in this embodiment, the desulfurization unit 300 includes a heat recovery unit 310, a wet desulfurization tower 311, The wet electric precipitator 312 and the reheater 313, the heat recovery device 310 and the reheater 313 are also connected by a circulating working fluid pipe, the flue gas after SCR deep denitration is preheated by low temperature air and then enters the heat recovery device in the desulfurization unit 300 The temperature is further reduced in 310, and the flue gas temperature after cooling is 70-90°C. At this time, it enters the wet desulfurization tower 311 for desulfurization treatment to ensure the desulfurization effect.

[0069] After desulfurization, the flue gas enters the wet electric precipitator 312 for dust removal. The heat absorbed by the heat recovery device 3...

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Abstract

The invention discloses a deep denitration process for a supercritical carbon dioxide coal-fired boiler, belonging to the technical field of NOx emission reduction. The deep denitration process comprises the following steps: three-stage ammonia injection denitration, wherein an ammonia injection combustor is used for injecting a fuel and an amino reducing agent into a main combustion area of a combustor in a boiler to form an annular high-temperature low-oxygen reduction area with a temperature of 850-1400 DEG C, and a reduction reaction is carried out in the annular high-temperature low-oxygen reduction area to achieve first-stage denitration, and a second-stage ammonia injection device and a third-stage ammonia injection device are used for respectively injecting an amino reducing agentto a main combustion area at the upper part of the high-temperature low-oxygen reduction area and a burnout area behind burnout air to realize second-stage denitration and third-stage denitration; anddedusting, desulfurization and denitrification, wherein SCR denitrification is conducted on the flue gas in a dedusting and denitrification unit, and then the flue gas is cooled to 70-90 DEG C and then sent into the boiler for circular denitrification treatment. The defect that the denitration degree is insufficient due to the fact that the temperature of the supercritical carbon dioxide coal-fired boiler is high in the prior art is overcome, deep staged denitration in the boiler is achieved through the three-stage ammonia injection denitration process, the temperature in the boiler is effectively reduced through low-temperature flue gas recirculation combustion, generation of thermal NOx is reduced, and deep denitration of the supercritical carbon dioxide coal-fired boiler is achieved.

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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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
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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