Numerical Simulation and Application Analysis of Near-wall Air Distribution System for Low Nitrogen Combustion of a 700MW Tangential Combustion Unit

被引：0

作者：

Du Z. ^{[1
]}

Meng Y. ^{[1
]}

Sun J. ^{[1
]}

Li W. ^{[2
]}

Li Y. ^{[1
]}

机构：

[1] Xi'an Thermal Power Research Institute Co., Ltd., Xi'an

[2] Fenchengerqi Power Plant, Jiangxi Ganneng Co., Ltd., Fencheng

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 01期

关键词：

700MW; Closing-to-wall air; Flue gas temperature deviation; High temperature corrosion; Low nitrogen combustion; Tangentially-fired boiler; Water wall;

D O I：

10.13334/j.0258-8013.pcsee.200591

中图分类号：

学科分类号：

摘要：

In order to solve the high temperature corrosion problem of a 2×700MW supercritical tangentially-fired boiler, a modification scheme of adding a closing-to-wall air system and optimizing the combustion of low NOx was proposed, and a series of numerical simulation were carried out for the combustion state of the full load furnace of the modification scheme, and the distribution of components such as O2, CO and H2S and the flue gas temperature near the wall of the main combustion zone were analyzed. The results show that after adding 2 layers /8 anti tangentair nozzles of the closing-to-wall air system, the concentration of O2 near the wall of the upper layer burner to the upper part of the reduction zone increases significantly, the concentration of CO and H2S decreases significantly, and the temperature of the flue gas decreases. The closing-to-wall air system can effectively prevent the high temperature corrosion of the water wall of the side wall in the reduction zone. Combined with the modified field adjustment test, it is found that the closing-to-wall air can improve the temperature distribution of flue gas at the outlet of the furnace and reduce the temperature deviation of the flue gas at the left and right sides, which is of great significance for the safe operation of the convective superheated surface of the horizontal flue gas in the tangentially-fired boiler. The safety and environmental protection of the boiler operation can be improved under the condition of economy when the closing-to-wall air system is added. © 2021 Chin. Soc. for Elec. Eng.

引用

页码：249 / 256

页数：7

共 18 条

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