Application of Air Cooling in the Production of Ultra-supercritical Steam Turbine Steel Castings
According to the theory of chill iron and the structure of high pressure inner cylinder casting,two sand cores were designed at the nozzle.Through theoretical calculation of cooling capacity,ϕ25mm inlet pipe and ϕ20mm outlet pipe were designed.The compressed air pressure was 0.7 MPa and the compressed air passing time was 180 s.The results show that the outlet temperature is more than 40℃higher than the inlet temperature,which reduces the temperature of the molten steel around the sand core,thus avoiding the problem of sand sticking in the narrow airway.
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