电力科技与环保2026，Vol.42Issue(4)：562-573,12.DOI:10.19944/j.eptep.1674-8069.2026.04.005
基于CFD的生物质气耦合燃煤锅炉低负荷稳定性研究
Research on low-load stability of biomass gas-coupled coal-fired boiler based on CFD
摘要
Abstract
[Objective]To evaluate the flow and combustion stability of a coal-fired boiler coupled with biomass gas under low-load conditions,and to provide a basis for flexible regulation of thermal power units.[Methods]A Computational Fluid Dynamics(CFD)model of a 640 MW supercritical tangential firing boiler was established,and studies under different loads and different co-firing ratios were conducted.A series of steady-state simulations were conducted under multiple load conditions(70%,50%,30%),each with biomass gas co-firing ratios of 5%,10%,15%and 25%.According to the theoretical flow characteristics of tangentially fired boilers,stability coefficients were constructed and used in combination with velocity field,temperature field,ignition temperature,ignition distance,temperature distribution,and flue gas emissions to comprehensively evaluate the stability of each operating condition.[Results]The results show that under 70%and 50%load conditions,the variation in stability coefficients with increasing co-firing ratio was small,and the internal flow structure and combustion field remained symmetrical and uniform,indicating good system stability.Under the 30%load condition,significant instability occurred when the co-firing ratio was 10%,with deviations in velocity and temperature stability coefficients reaching 61.53%and 10.19%,respectively.Further increases in the co-firing ratio led to some improvement in stability,but performance remained inferior to that under medium and high loads.Increasing the co-firing ratio reduced the ignition temperature and ignition distance of pulverized coal,enhanced combustion intensity,and elevated furnace temperature,with the most pronounced temperature rise observed at 30%load.In terms of emissions,co-firing biomass gas effectively reduced CO2 and NOx concentrations at the furnace outlet across all operating conditions,with maximum reductions of 26.98%and 50.6%,respectively.[Conclusion]These findings indicate that appropriately increasing the co-firing ratio can improve combustion stability and emission performance under low-load conditions.关键词
生物质/掺烧/低负荷/稳定性/数值模拟Key words
biomass/co-firing/low load/stability/numerical simulation分类
能源科技引用本文复制引用
赵钧,汪家军,李涛,刘三举,龚勋..基于CFD的生物质气耦合燃煤锅炉低负荷稳定性研究[J].电力科技与环保,2026,42(4):562-573,12.基金项目
生物质气化耦合发电技术综合研究与应用(CHDKJ23-02-79) （CHDKJ23-02-79）
