Pre-combustion chamber blowing device for top-combustion type hot blast furnace

The utility model provides a pre-combustion chamber blowing device for a top-combustion type hot blast furnace. The pre-combustion chamber blowing device comprises a nitrogen pipeline and a flue exhaust pipeline, wherein an exhaust branch pipeline is additionally arranged at the tail end of the flue exhaust pipeline; the other end of the exhaust branch pipeline is connected with the nitrogen pipeline; and the exhaust branch pipeline is connected with a draught fan and an exhaust control valve. The pre-combustion chamber blowing device has the advantages of being reasonable in structural design, convenient to install and use, good in application effect and the like. The exhaust branch pipeline is additionally arranged on the flue exhaust pipeline; and flue exhaust can be introduced to blow the pre-combustion chamber and a gas duct instead of nitrogen by the draught fan, so that the production cost can be greatly lowered.