Numerical study on the effect of separated over-fire air ratio on combustion characteristics and NOx emission in a 1000 MW supercritical CO2 boiler

被引：26

作者：

Gu, Mingyan ^{[1
]}

Wang, Mingming ^{[1
]}

Chen, Xue ^{[1
]}

Wang, Jimin ^{[1
]}

Lin, Yuyu ^{[1
]}

Chu, Huaqiang ^{[1
]}

机构：

[1] Anhui Univ Technol, Sch Energy & Environm, Maanshan 243002, Peoples R China

来源：

ENERGY | 2019年 / 175卷

基金：

国家重点研发计划;

关键词：

Supercritical coal-fired CO2 boiler; Numerical simulation; NOx emission; SOFA ratio; SIMULATION; FLOW; GENERATION; FURNACE; CYCLES;

D O I：

10.1016/j.energy.2019.03.111

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

As an advanced power generation system, supercritical CO2 (S-CO2) coal fired power plant has advantages of high electric efficient and compact system layout. In this paper, the coal combustion characteristics and NOx formation in coal-fired S-CO2 boiler has been explored by numerical simulation. The boiler wall temperature distributions were determined according to the 1/8 partial flow strategy for S-CO2 coal-fired power plant. The effect of SOFA ratio on the gas flow field, the gas temperature, the species concentration including NOx distribution was investigated. The results show that the SOFA ratio has a great influence on the coal combustion process and NOx formation. With the increase of SOFA ratio, the O-2 concentration decreases in the main coal burning zone, a higher CO concentration can be found. A lower gas temperature zone in the main burning zone and a lower NOx emission near the furnace outlet can also be observed with a higher SOFA ratio. The results presented promote a better understanding of the NOx formation characteristics and would be benefit for the NOx control in coal-fired S-CO2 boiler. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：593 / 603

页数：11

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