In order to study the migration and release rules of alkali metals during the combustion of Zhundong coal

a set of flat flame detection platform

with the fuel of ethylene

was constructed based on the principle of flame self-emission spectrum. Moreover

the spectrometer was used for the combustion experiments of Wucaiwan coal. The results show that

the change of flame and morphology of coal particles has a certain correspondence with the release stages of alkali metals. The temperature and alkali metal release can be measured simultaneously. The release process of alkali metals can be divided into three stages: the volatile phase

the coke phase and the ash phase. The volatile phase and the coke phase both have a short duration

while the release rate of alkali metals is about 50%.