In-situ Measurement of Sodium and Potassium Release during Oxy-Fuel Combustion of Lignite using Laser-Induced Breakdown Spectroscopy: Effects of O-2 and CO2 Concentration
In-situ Measurement of Sodium and Potassium Release during Oxy-Fuel Combustion of Lignite using Laser-Induced Breakdown Spectroscopy: Effects of O-2 and CO2 Concentration
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DOI：
10.1021/ef301750h
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发表时间：
2013-01
期刊：
影响因子：
5.3
通讯作者：
Yong He;Jiajian Zhu;Bo Li;Zhihua Wang;Zhongshan Li;M. Aldén;K. Cen
中科院分区：
文献类型：
--
作者：
Yong He;Jiajian Zhu;Bo Li;Zhihua Wang;Zhongshan Li;M. Aldén;K. Cen
采用激光诱导击穿光谱（LIBS）技术对富氧燃烧条件下煤颗粒中钠（Na）和钾（K）的释放进行了定量研究。采用专门设计的层流预混燃烧器提供不同O2和CO2浓度的燃后环境，系统研究了O2和CO2对煤富氧燃烧过程中Na和K释放的影响。对于挥发分释放阶段，O2和CO2对Na和K的释放都没有显著影响。Na和K的释放在焦炭阶段，但是，在不同的O2和CO2浓度的变化显着。在这些实验条件下，当O2浓度从3.9%增加到10.6%时，焦炭阶段的Na的最大浓度从15.2 mg/m3增加到33.7 mg/m3，K的最大浓度从6.2 mg/m3增加到11.7 mg/m3。当CO2浓度从35.8%增加到69.4%时，Na、K的释放量随CO2浓度的增加而增加。
Laser-induced breakdown spectroscopy (LIBS) was used in this study to measure quantitatively the sodium (Na) and potassium (K) release from burning coal particles under oxy-fuel combustion environments. A specially designed laminar premixed burner was employed to provide a postflame environment with different O2 and CO2 concentrations, in which the effects of O2 and CO2 on the release of Na and K during coal oxy-fuel combustion were studied systematically. For the devolatilization stage, neither O2 nor CO2 had significant influence on the Na and K release. The release of Na and K during the char stage, however, changed significantly at different O2 and CO2 concentrations. Under these experimental conditions, when the O2 concentration increased from 3.9% to 10.6%, the peak concentration of Na at the char stage increased from 15.2 mg/m3 to 33.7 mg/m3, and the maximum concentration of K increased from 6.2 mg/m3 to 11.7 mg/m3. When the CO2 concentration increased from 35.8% to 69.4%, the release of Na and K w...