Numerical Simulation Study on the Strength of Fire and Explosion Resistant Plugging Structure of Rheological Valve Hall Entrance

Abstract An integrated fire-resistant and explosion-proof blockage structure has been designed for the valve hall bushing hole of the Qinyang ±800 kV large converter transformer. The structure consists of a stainless steel plate, zirconium silicate board, inorganic fireproof board, nano-insulation board, and a stainless steel square tube support structure. A three-dimensional numerical simulation analysis was conducted based on explicit dynamics methods. The results show that the designed fire-resistant and explosion-proof integrated blockage structure exhibits repeated oscillations under the effect of a peak overpressure of 800 kPa from the explosion shock wave. The maximum instantaneous deformation of the surface of the explosion-proof structure and the internal skeleton support structure is 4.71 mm, with no damage or fracture occurring. The structure can effectively withstand the aforementioned explosion shock wave overpressure. This research provides an important reference for the fire-resistant and explosion-proof engineering design of ultra-high voltage converter stations.