化工进展 ›› 2017, Vol. 36 ›› Issue (09): 3237-3242.DOI: 10.16085/j.issn.1000-6613.2017-2034

• 化工过程与装备 • 上一篇    下一篇

异距贴壁风喷口布置方案的数值模拟

孟凡冉, 高畅, 金保昇, 张勇   

  1. 东南大学能源热转换及其过程测控教育部重点实验室, 江苏 南京 210096
  • 收稿日期:2016-11-06 修回日期:2016-12-07 出版日期:2017-09-05 发布日期:2017-09-05
  • 通讯作者: 金保昇,教授,博士生导师。
  • 作者简介:孟凡冉(1992-),男,硕士研究生,研究方向为锅炉燃烧及其污染物控制。E-mail:220140479@seu.edu.cn

Numerical simulation of near-wall air scheme combined with different jet position

MENG Fanran, GAO Chang, JIN Baosheng, ZHANG Yong   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2016-11-06 Revised:2016-12-07 Online:2017-09-05 Published:2017-09-05

摘要: 为了消除某600MW前后墙旋流对冲锅炉侧墙水冷壁出现的高温腐蚀现象,在前后墙开3层对冲贴壁风喷口,借助Fluent软件模拟计算了原始运行工况以及不同贴壁风工况下的炉内燃烧,并着重分析了侧墙近壁区内还原性气体(CO)浓度的分布情况;结果表明,数值模拟的结果比较符合炉膛实际的运行情况,不同贴壁风喷口类型的防腐效果并没有显示出太大差异;受上升烟气的携带作用,贴壁风喷口的布置方式对贴壁风的防腐效果影响很大;采用异距式贴壁风喷口的布置方式并结合贴壁风射流补氧特性,在贴壁风率消耗不到4%的前提下,就使侧墙近壁区的还原性气氛浓度达到较低水平,说明在合适的喷口布置以及速差组合的基础上,前后墙贴壁风布置方式可以有效地抑制侧墙水冷壁高温腐蚀。

关键词: 旋流对冲锅炉, 高温腐蚀, 异距喷口布置方案, 数值模拟

Abstract: In order to eliminate the high temperature corrosion of the side water-cooled wall in a 600 MW front and rear wall swirl-opposed firing boiler,three layers of opposed near-wall air nozzle were punched in the front and rear walls. The boiler combustion of original condition and near-wall air condition with different nozzle arrangement schemes was simulated by use of Fluent. The distribution of reductive atmosphere of near-wall region was emphatically focused on. The results showed that the simulation results agreed with the actual operation condition of boiler and the anti-corrosion performance of different nozzle patterns was limited. Due to the push of rising flue gases from the bottom,the nozzle arrangement had a great influence on the effect on anti-corrosion. In addition,by adjusting the position of nozzle and combining the nozzle flow characteristics,the coverage of reductive atmosphere in the near-wall region maintained at a low level while the ratio of near-wall air was less than 4%,indicating that the front and rear wall arrangement scheme can effectively restrain the high temperature corrosion of the side water-cooled wall on the basis of the combination of appropriate nozzle positions and nozzle flow velocity.

Key words: swirl opposed boiler, high temperature corrosion, scheme with different jet distances, numerical simulation

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