炉底漏风对火焰形态和排烟温度的影响

doi:10.11930/j.issn.1004-9649.2016.05.091.06

摘要/Abstract

摘要： 为了揭示炉底漏风进入炉膛后排烟温度大幅度升高但空气预热器入口烟气温度无明显变化的原因，采用计算流体力学模拟方法对炉底部漏风进入炉膛后火焰形态的变化规律进行了研究，结果表明：炉底漏风对燃烧器区以上的火焰形态和火焰中心几乎无影响，当漏风率达到总风量10%时，炉膛出口火焰温度增加15.7 ℃；基于空气预热器换热的热平衡推导了炉底漏风使通过空气预器风量减少引起排烟温度升高的关系式，解释了炉底漏风后空气预热器入口烟温不变、排烟温度大幅变化的现象，可以作为该领域相关技术工作的参考及借鉴。

关键词: 火电厂, 锅炉, 炉底, 漏风, 火焰形态, 排烟温度

Abstract: To uncover the reasons for the substantial exhaust flue gas temperature rise without much flue gas temperature change at the air heater inlet when cold air leaks from the furnace bottom, the computational fluid dynamics simulation is conducted to study the variation patterns of the flame style with Fluent software. The results show that the bottom air leakage has very few impacts on the flame style in the area above the combustor zone and the flame center. However, if the bottom air leakage reaches as much as 10% of the total air volume, the flame temperature at the furnace outlet will increase by 15.7 ℃. Based on the heat balance principle of the air heater, two relational expressions are derived presenting the exhaust flue gas temperature rise due to the air reduction in the air heater caused by bottom air leakage, which explains why the exhaust flue gas temperature rises significantly while the flue gas temperature remains almost the same at the air heater inlet in the event of furnace bottom air leakage. The study results can provide reference for relevant work in this field.

Key words: thermal power plant, boiler, furnace bottom, air leakage, flame style, exhaust flue gas temperature

中图分类号:

赵振宁，李媛园，张清峰，赵振宙. 炉底漏风对火焰形态和排烟温度的影响[J]. 中国电力, 2016, 49(5): 91-96.

ZHAO Zhenning, LI Yuanyuan, ZHANG Qingfeng, ZHAO Zhenzhou. Impact of Air Leakage from Furnace Bottom on Flame Style and Exhaust Flue Gas Temperature[J]. Electric Power, 2016, 49(5): 91-96.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.2016.05.091.06

https://www.electricpower.com.cn/CN/Y2016/V49/I5/91

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