Title: Modelling and simulation of ash accumulation in SP boiler of decomposition kiln

Authors: Shunsheng Xu; Chong Shen; Kongyao Wang; Fulian Yao; Jiazhen He

Addresses: School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; School of Energy Science and Engineering, Central South University, Changsha 410083, China ' School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China ' School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China ' School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China ' School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China

Abstract: In this paper, the problem of ash accumulation in the superheater of a suspension preheater (SP) waste heat boiler is studied. A comprehensive ash accumulation growth model, including deposition and removal process, is established and verified by experimental results. According to the established model, the effects of flue gas velocity, ash concentration and tube shape on the ash accumulation are studied. The ash growth prediction model based on the initial simulation value fitting is proposed and used in the research of ash prediction. The results show that the ash growth prediction model can predict the ash accumulation better; the ash accumulation rate increases with the flue gas velocity and the ash concentration; the ash accumulation time constant decreases; the maximum ash accumulation decreases negatively with the flue gas velocity but is little affected by the ash concentration; the performance of the oval tube to reduce the ash accumulation is better than that of the round tube; when the oval tube layout angle is 45°, the effect is best; and the comprehensive evaluation effect on the heat transfer and resistance is the best.

Keywords: SP waste heat boiler; ash accumulation; the simulation; accumulation of ash growth prediction; oval tube layout angle.

DOI: 10.1504/PCFD.2023.128738

Progress in Computational Fluid Dynamics, An International Journal, 2023 Vol.23 No.1, pp.52 - 63

Received: 26 Mar 2021
Accepted: 15 Feb 2022
Published online: 02 Feb 2023 *