Numerical Simulation Research on Screen Superheater of Supercritical Circulating Fluidized Bed Boiler

Nenghong Zheng; Jun Li; Ye Chen

doi:10.54691/czsm3b20

Authors

Nenghong Zheng
Jun Li
Ye Chen

DOI:

https://doi.org/10.54691/czsm3b20

Keywords:

Supercritical Circulating Fluidized Bed Boiler; Screen Superheater; Thermal Deviation; Finite Element Analysis; Temperature Field; Thermal Deformation.

Abstract

In view of the problems such as wear, deformation and tube burst existing in the operation of the screen superheater in the supercritical circulating fluidized bed boiler, a computational quasi-model of the screen superheater was established in this paper. Combined with the actual operation data of the boiler, the temperature distribution and thermal deformation of the screen superheater tube panel under 100% MCR conditions were numerically simulated by ANSYS finite element analysis software. The results show that the maximum wall temperature of the tube panel appears at the penetration wall between the screen superheater and the water-cooled wall of the furnace roof, on the fin of the 50th tube of the tube panel, with the highest temperature reaching 652.97℃, and a local overheating phenomenon occurs. The maximum thermal deviation between the fin and the tube wall is 15.3℃. The maximum thermal deformation of the tube panel is 215.85mm. Among them, the tube panel is freely movable along the Z direction due to the suspension device, with a deformation of 212.33mm, while along the X direction, due to the constraint at the lower part of the tube panel, although there is a thermal deviation, the deformation is only 51.88mm.

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