Simulation of thermal state of a blast furnace blower nozzle

Items of durability increase of blower nozzle and reduction of heat losses through their surface are actual today. Reduction of heat losses is reached by different ways, including application of heat isolation insertion.  In the Ansys Fluent media within a frame of stationary and non-stationary approaches, a simulation of process of fluid media movement, heat exchange and temperature field of the heat isolation insertion, installed into the internal cylinder of the blast furnace blower nozzle both with an air gap and without air gap carried out. The calculated area considered, which included fluid media inside the blow channel of the nozzle and heat isolation insertion. Availability of the internal cylinder, air gap, separating the cylinder from the insertion, and heat exchange with the nozzle cooling water were taken into consideration within expanded boundary conditions. It was shown, that the insertion, installed into the internal cylinder with air gap, has higher temperature in stationary position and better decreases heat losses through the internal cylinder, than the insertion, installed into the internal cylinder without air gap. Maximum temperature drop between the insertion surfaces, installed into the internal cylinder without air gap, is reached in stationary state. For the insertion installed in the internal cylinder with air gap, during heating a shot–term drop increase was observed, following by a decrease till the value, corresponding to stationary state (which is considerably smaller than that at no gap conditions).