Oxygen lance nitrogen sealing device

The invention provides an oxygen lance nitrogen sealing device which comprises an annular nitrogen sealing seat, an annular gas cavity is formed in the nitrogen sealing seat, a plurality of rows of nitrogen holes are sequentially formed in the inner side wall of the nitrogen sealing seat from top to bottom, the nitrogen holes are communicated with the annular gas cavity, and each row of nitrogen holes are distributed in a staggered mode. The central axis of each row of nitrogen holes faces the center of the nitrogen sealing base and inclines downwards, and the inclination angle of each row of nitrogen holes is gradually increased from top to bottom. The multiple rows of nitrogen holes distributed in a staggered mode are formed from top to bottom, the multiple rows of nitrogen holes spray nitrogen for sealing synchronously, due to the existence of the inclination angle, the spraying of the nitrogen and smoke hedging are achieved, the sealing effect is improved, the sprayed nitrogen flow can form a complete and