应用原子特征发射谱线法测量煤粉火焰温度

Measurement of Pulverized Coal Flame's Temperature by Spectrum Analysis of Characteristic Atomic Emissions

利用光纤光谱仪对煤粉火焰温度在线测量进行了研究。这种方法考虑原子在辐射场中受到的影响,以原子特征发射谱线相对强度模型来计算煤粉火焰温度,该模型与Plank定律有着相似的表达形式,因而可以基于Plank定律的一些研究方法来对该方法进行研究。结果表明:原子特征发射谱线法火焰温度测量和热电偶火焰温度测量是两种不同原理的测量方法,只有当系统满足热平衡条件时,两种方法的测量结果才相同;否则,两种方法测得的火焰温度不能直接进行数值上的比较。煤粉火焰温度测量也不能使用等离子体火焰温度测量的方法。

Studies concerning on-line measurement, of pulverized coal flame＇s temperature, have been conducted with a fiber-optic spectrometer. This method considers the interaction between atomic emission and the radiation field. The pulverized coal flame＇s temperature is calculated, with the help of a characteristic atomic emission spectrum＇ s relative intensity model, which is formulated similarly like Plank＇s law. Thus the methods, once used for studying Plank＇s law, can also be used in our case. Results indicate that principles concerned in flame temperature measurements, using characteristic atomic emission spectrums, are different from those of using thermocouples. Only when heat equilibrium conditions are satisfied, do measurement results obtained by the two methods coincide with one-another. Otherwise, flame temperatures obtained by the two methods can not numerically be compared in a direct way.