Influence of the geometry of blow channel on the efficiency of operation of blast furnace air tuyere
摘要
For the efficient operation of a blast furnace air tuyere, it is necessary, on the one hand, to try to increase the completeness of the reaction of natural-gas combustion inside the blow channel and, on the other hand, to protect the inner cup of the tuyere against burnout. As one of the techniques used for simultaneous solving these problems, we can mention the installation of a heat-insulating ceramic insert into the blow channel of the tuyere. In the present paper, we consider the possibility of varying the geometry of the blow channel as a result of formation of the surface topography on the insert in the form of either an annular groove or a spiral on the surface of the insert made to enhance the completeness of combustion reaction already in the blow channel.
The processes of motion of liquid media, heat exchange, and natural gas combustion in the blow channel of the blast-furnace tuyere containing an installed ceramic insert with a groove of triangular section in the form of a ring or a spiral were simulated in the Ansys 21.2 medium. It is shown that the creation of a groove of this kind on the inner surface of the insert leads to an increase in the total amount of heat released as a result of combustion of natural gas, which is confirmed by the increase of the CO2 content, temperature, and blast speed at the exit of the tuyere.