Structure Optimization of Ceramic Protective Casing in the Waste Heat Boiler

Abstract

The ceramic bushing in the waste heat boiler uses its poor thermal conductivity to isolate the high temperature of the pipe mouth area, protecting the protective parts of the tube plate and the pipe head. The tube head regions produces sulfur corrosion and ceramic protection tube rupture due to the high temperature, resulting in gas leakage, the tube in the process of the tube plate and the heat pipe damage and other problems. Based on the principle of jet flow, this paper presents a new type of ceramic protective casing structure. The numerical model has been established for the heat transfer problem in the pipe section of the waste heat boiler tube, and the corresponding numerical analysis has been carried out. The numerical results show that the gradually shrinking and diffused ceramic protective casing can effectively improve the temperature distribution of the inlet zone, reducing the waste heat boiler pipe heat pipe wall temperature, inhibit the ceramic protection tube heat stress rupture problems, the effective protection of the tube plate and the tube top structure along with the increase of tapered parts; the length of the tapered protective effect of gradually expanding type of ceramic casing is more significant.