Investigation on lateral dispersion characteristics of fuel particles in dense phase zone of a large-scale circulating fluidized bed boiler under combustion conditions
作者机构：Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University)Ministry of EducationChongqing400044China Dongfang Boiler Group CoLtdChengdu611731.China Geely Baikuang Group Co.LtdGuangxi533000China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2023年第78卷第7期
页 面：62-72页
核心收录：
学科分类：080703[工学-动力机械及工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理]
基 金：supported by the National Natural Science Foundation of China(grant No.52176101).
主 题：Dispersion Large-scale CFB Fuel particles Combustion Dense phase zone
摘 要：The dispersion characteristics of fuel particles in the dense phase zone in circulating fluidized bed(CFB)boilers have an important influence on bed temperature distribution and pollutant emissions.However,previous research in literature was mostly on small-scale apparatus,whose results could not be applied directly to large-scale CFB with multiple dispersion sources.To help solve this problem,we proposed a novel method to estimate the lateral dispersion coefficient(Dx)of fuel particles under partial coal cut-off condition in a 35o MW supercritical CFB boiler based on combustion and dispersion models.Meanwhile,we carried out experiments to obtain the Dx in the range of 0.1218-0.1406 m2/s.Numerical simulations were performed and the influence of operating conditions and furnace structure on fuel dispersion characteristics was investigated,the simulation value of Dx was validated against experimental data.Results revealed that the distribution of bed temperature caused by the fuel dispersion was mainly formed by char combustion.Because of the presence of intermediate water-cooled partition wall,the mixing and dispersion of fuel and bed material particles between the left and right sides of the furnace were hindered,increasing the non-uniformity of the bed temperature near furnace front wall.
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