Experimental study on the working states of membrane walls in the arch-fired boiler with different fuel proportion coefficients

作     者：Wen, D. Yao, Y. S. Li, L. Jeon, Min-Gyu Zhou, Q. L. Li, N. Deguchi, Y. 

作者机构：Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Tokushima Univ Grad Sch Adv Technol & Sci Tokushima 7708501 Japan 

出 版 物：《APPLIED THERMAL ENGINEERING》 (实用热力工程)

年 卷 期：2019年第148卷

页      面：404-411页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Key Research and Development Program of China [2018YFF0216005, 2016YFC0801904] Fundamental Research Funds for the Central Universities 

主　　题：Arch-fired boiler Membrane walls' deformation Temperature Heat flux Strain and stress Fuel proportion coefficient 

摘      要：To ensure boiler safety operating, it is necessary to obtain a systematic knowledge about the working states of membrane walls and find the most salient impact factors of membrane walls deformation. In this study, a scaled down arch-fired boiler is used to investigate temperature, heat flux, strain and stress on its membrane walls. The results showed that an extremely high strain and stress appeared at high-temperature zone. It was mostly presented on the front wall in the lower furnace, which is near the angle connecting the lower furnace and the ash hopper. The flow-field deflection is the forming reason for it. Both the angle and external constraints such as water pipes had a significant influence upon it as well. They restricted the direction of stress. However, the heat flux had less impact on the deformation. Compared with the symmetrical fuel supplying (c = 1) condition, changing the fuel proportion coefficient (denoted by c) would increase the strain and stress on the front wall. But, combined the temperature change, the optimal range of c was found to be 0.8-1. The results obtained in this experiment are meant to be valuable in designing and optimizing the arch-fired boilers configuration and operation.