通过对密封罩吹氩喷粉设备工艺的设计应用，研究了喷粉脱硫过程中钢液氮含量变化。试验结果表明，密封罩喷粉工艺降低了钢液面氮分压，不仅能够防止钢液吸氮，还具有一定的脱氮效果。 Through the design and application of the technology of blowing argon gas shield equipment into the shield, the change of nitrogen content in liquid steel during dusting desulfurization was studied. The test results show that the sealing powder coating process reduces the partial pressure of nitrogen in the liquid steel, which can not only prevent the liquid nitrogen from absorbing nitrogen, but also have certain denitrification effect.