O_(2)/CO_(2)和O_(2)/N_(2)氛围下煤粉富氧燃烧数值模拟  

Numerical Simulation of Oxygen Enriched Combustion of Pulverized Coal in O_(2)/CO_(2) and O_(2)/N_(2) Atmospheres

作　　者：王珂 WANG Ke(Wuhan Design and Research Co.Ltd.,China Coal Technology and Engineering Group,Wuhan 430064,China)

机构地区：[1]中煤科工集团武汉设计研究院有限公司,湖北武汉430064

出　　处：《工业加热》2023年第9期39-41,51,共4页Industrial Heating

基　　金：中煤科工集团武汉设计研究院有限公司自主研发项目(ZZYF202248)。

摘　　要：在目前煤炭依然作为能源主体的背景下,控制燃煤污染物排放有着重要意义。基于CFD数值模拟,建立伴流燃烧器模型,控制燃料、氧化剂入口流量恒定,设计了O_(2)/CO_(2)、O_(2)/N_(2)氧化剂氛围中O_(2)浓度在21%~40%内的多种工况,对煤粉燃烧特性及燃烧产生的污染物进行了研究。分析了不同工况下煤粉燃烧的温度分布、燃烧速率、碳烟、NOx的生成情况。结果显示,在O_(2)/CO_(2)、O_(2)/N_(2)两种氧化剂氛围中,随着O_(2)浓度的上升,煤粉燃烧温度升高、燃烧速率增大,碳烟生成量均增加,同等O_(2)浓度条件下,O_(2)/CO_(2)氛围的煤粉燃烧温度和燃烧速率均高于O_(2)/N_(2)氛围,碳烟生成量小于O_(2)/N_(2)氛围,且O_(2)/CO_(2)氛围几乎不会产生NOx。总结了O_(2)/CO_(2)氛围中燃烧的优势,并提出此氛围中O_(2)的合适浓度为25%,为煤炭的高效、清洁利用提供了建议。Under the background that coal is still the main energy source,it is of great significance to control the emission of pollutants from coal combustion.Based on CFD numerical simulation,the model of wake burner is established.Control the constant inlet flow of fuel and oxidizer.Various operating conditions with O_(2) concentration in the range of 21%~40%in O_(2)/CO_(2) and O_(2)/N_(2) oxidant atmosphere were designed.The combustion characteristics and pollutant generation of pulverized coal were studied.The temperature distribution,combustion rate,carbon smoke and NOx formation of pulverized coal under different working conditions were analyzed.The results show that in O_(2)/CO_(2) and O_(2)/N_(2) oxidizing atmospheres,with the increase of O_(2) concentration,the pulverized coal combustion temperature and combustion rate increase,and the soot generation amount increase.Under the same O_(2) concentration,the pulverized coal combustion temperature and combustion rate in O_(2)/CO_(2) atmosphere are higher than that in O_(2)/N_(2) atmosphere,and the soot generation amount is lower than that in O_(2)/N_(2) atmosphere.And the O_(2)/CO_(2) atmosphere hardly produces NOx.The advantages of combustion in O_(2)/CO_(2) atmosphere are summarized,and the appropriate concentration of O_(2) in this atmosphere is 25%,which provides suggestions for efficient and clean utilization of coal.

关 键 词：煤粉燃烧 富氧 碳烟 数值模拟 

分 类 号：TQ38.2[化学工程]