Quantitative loading system for liquid sulfur

The utility model discloses a liquid sulfur quantitative loading system which comprises a liquid sulfur loading pump, the liquid sulfur loading pump is connected to a liquid sulfur tank of a tank car through a pipeline, and a liquid sulfur pipe is provided with a mass flow meter and a first switch valve; a liquid sulfur tank tail gas collecting pipe is connected with a tail gas inlet of a first steam ejector, the first steam ejector is connected with a steam pipe and a first waste gas discharging pipe, and a steam branch pipe and a second switch valve are arranged on the steam pipe. An upper cavity of the liquid sulfur pool is connected with a tail gas inlet of a second steam ejector through a pipeline, the second steam ejector is respectively connected with a steam branch pipe and a second waste gas discharge pipe, and the first waste gas discharge pipe is connected with the second waste gas discharge pipe; and the liquid sulfur loading pump, the mass flow meter, the first switch valve, the second switch val