锅炉熄火后压力变化特性的数值研究  

Numerical Simulation on Pressure Characteristic of Boiler after Flameout

作　　者：赵振宙[1] 赵振宁[2] 

机构地区：[1]河海大学能源与电气学院,江苏南京210098 [2]华北电力科学研究院有限责任公司,北京100045

出　　处：《锅炉技术》2011年第3期18-23,共6页Boiler Technology

摘　　要：以600 MW锅炉原形为计算对象,建立了锅炉全系统三维数理模型,并采用文献[10]试验结果进行验证,两者吻合良好,证明模型是适用的。基于此模型,对熄火后锅炉全系统的温度、组分、压力以及风量变化规律进行了研究,分析锅炉熄火后压力变化规律。研究得出,熄火后,温度下降、水蒸气(H2O)体积减少,CO2体积的减少引起烟气质量的降低、送风不足都导致锅炉负压增大。炉膛温度下降最快,组分变化最剧烈,导致炉膛产生的负压最大,内爆几率最大;采用延时断燃料,可有效减少炉膛的最大负压。Acording to a 600 MW boiler,three-dimensional model on whole boiler is established in the paper,and validated by test results in Ref ,the values between the test and simulation is well meeted,which proves the model is corrected.Based on the model,the changes characteristic of temperature,gas content,pressure,air or gas mass are researched to discover the reason of furnace implosion.The conclusions show： after flameout,temperature decreasing,volume H2O gas decreasing,gas mass decreasing induced by volume CO2 decreasing,shortage of air,all of them lead to a big negative pressure in boiler.While temperature decreases most quickly and gas content changes most intensively,those lead to that furnace negative pressure is biggest among whole boiler system.ramp shutting fuel is an available way to decrease negative pressure of furnace.

关 键 词：锅炉内爆 全系统模型 烟风系统 炉膛压力 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]