Abstract: To tackle the problems of heavy weight and high cost associated with large-diameter bolted flat head, this paper proposed the spherically dished cover with a bolting flange as an alternative structure. Taking the flat head of a DN1900 stirred reactor in a certain project as the research object, the finite element numerical calculation method was employed to investigate the influence patterns of design variables on the peak equivalent stress (S_eq), central displacement (Δy₁) and sealing surface displacement (Δy₂) in both the simplified bolted flat head and the simplified spherically dished cover with a bolting flange. The results indicated that the comprehensive mechanical properties of the spherically dished cover with a bolting flange were superior to those of the bolted flat head. Applying the findings of this research to the design of multi-opening flat head for stirred reactors, the mass of the optimized head is reduced by 55%. This demonstrates that the spherically dished cover with a bolting flange offers greater economic advantages over the bolted flat head while ensuring structural strength and stiffness and holds significant potential for widespread adoption.

Key words: flat headlspherically dished cover with a bolting flangellightweightlsensitivitylresponse surface