Abstract: The main reasons for nozzle blocking are analyzed through an investigation of plugged nozzle and morphology of accretion.

• 文摘:通过对堵塞水口及堵塞物形态的调查，分析了引起水口堵塞的主要原因，并采用了中间包塞棒吹氩技术来预防水口堵塞。