Method for increasing nitrogen increment in converter tapping process

The invention relates to the field of converter steelmaking, in particular to a method for increasing nitrogen increment in the converter tapping process. Comprising the following steps that (1) molten steel flows out of a tapping hole into a steel ladle; (2) timing is started when the molten steel flows out, and a carburant is added into the steel flow; (3) adding a deoxidizing agent into molten steel in the steel ladle along the steel flow direction; (4) when the molten steel (4) flows out for 60-130 seconds, adding a weighing alloy; during adding, a valve switch is turned on, the alloy is added for 5-10 seconds along the steel flow, then the valve is turned off for 1-3 seconds, and the process is repeated until all the alloy is added; and (5) after all the molten steel in the converter flows to the steel ladle, the control valve at the outlet of the tapping hole is closed. The method can be applied to any steel plant for producing similar steel, and has the advantages of wide application range, high popula