本发明公开了一种高炉炉顶料罐放散煤气全回收方法及系统，根据料罐内放散煤气的气压大小对应采取两个回收阶段：高压煤气回收阶段和低压煤气回收阶段。高压煤气回收阶段利用料罐内放散煤气与煤气管网之间的自由气压差，将料罐中的高压放散煤气直接回收到煤气管网；低压煤气回收阶段则通过引射器引射料罐内的放散煤气，引射器采用料罐的一次均压煤气或者料罐的二次均压氮气作为引射源，不会污染回收的放散煤气，引射器采用非负压引射，低压煤气回收阶段在料罐内的放散煤气气压降至100Pa~200Pa时停止，可避免过度引射使得料罐内形成负压而进入空气，避免引射器恶性事故的出现。

The invention discloses a full recovery method and system for the gas released from the top hopper of the blast furnace. According to the gas pressure released in the hopper, two recovery stages are adopted : the high pressure gas recovery stage and the low pressure gas recovery stage. In the high pressure gas recovery stage, the high pressure released gas in the tank is directly recovered to the gas pipe network by using the free pressure difference between the released gas in the tank and the gas pipe network ; in the low pressure gas recovery stage, the scattered gas in the material tank is introduced by the ejector. The ejector uses the primary pressure-equalizing gas of the material tank or the secondary pressure-equalizing nitrogen of the material tank as the source of the ejector, which does not pollute the recycled scattered gas. The ejector adopts non-negative pressure ejection. When the pressure of the scattered gas in the material tank is reduced to 100 Pa ~ 200 Pa, the low pressure gas recovery stage stops, which can avoid excessive ejection to form negative pressure in the material tank and enter the air, and avoid the occurrence of malignant accidents of the ejector.