新疆高碱煤旋风燃烧火焰中气相碱金属的检测与分析

新疆高碱煤中富含的碱金属易挥发进入气相，准确测量火焰中气相碱金属浓度是调控新疆高碱煤燃烧的重要基础。本文采用光谱分析方法对准东高碱煤旋风燃烧火焰中气相Na、K离子体积分数进行了测量。结果表明：在可见光波段，Na的特征谱线为589 nm, K的特征谱线为765.9和769.3 nm, Na、K离子特征谱线辐射强度与气相Na、K离子体积分数成正比例关系；旋风燃烧温度下，煤中绝大部分水溶性的Na离子和全部的K离子会释放进入气相，该过程不受配风方式和氧体积分数的影响；在旋风炉尾部，气态Na、K离子体积分数降低，碱金属由气相向固相迁移。

Detection and Analysis of Gaseous Alkali Metals of Xinjiang High Alkali Coal Combustion Flame in Cyclone Furnace

The alkali metals in Xinjiang high alkali coal can easily volatilize and enter the gas phase,thus the accurate measurement of the gaseous alkali metal concentration in the flame is an important basis for regulating and controlling the combustion of Xinjiang high alkali coal.In this paper,the spectral analysis method is used to measure the volume fractions of gaseous Na and K ions in the Zhundong high alkali coal cyclone combustion flame.The results show that in the visible spectral bands,the characteristic spectral line of Na is at 589 nm,and those of K are at 765.9 nm and 769.3 nm.The radiation intensities deduced from the characteristic spectral lines of Na and K are proportional to the volume fractions of gaseous Na and K ions.At the temperature of cyclone combustion,most water soluble Na and all K ions in coal will be released into the gas phase,which is not affected by air distribution mode and oxygen volume fraction.At the tail of the cyclone furnace,the volume fractions of the gaseous Na and K ions decrease,indicating that the alkali metals migrate from the gas phase to the solid phase.