对冲燃烧超临界锅炉气固两相流动数值模拟  

Numerical Simulation of Gas-solid Two-phase Flowing in Opposed Firing Supercritical Boiler

作　　者：王为术[1] 田苗[1] 胡庆伟 郑梦星 

机构地区：[1]华北水利水电大学热能工程研究中心,河南郑州450011 [2]大唐三门峡发电有限责任公司,河南三门峡472143

出　　处：《热能动力工程》2017年第5期64-69,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51276210);河南省高校创新团队项目(16IRTSTHN017);河南省科技创新人才计划(154100510011)

摘　　要：为研究1 900 t/h超临界燃烧锅炉炉内气固两相流动问题,采用标准k-ε模型和DPM模型(离散相模型)对3种典型负荷下炉内流动特性和固体颗粒轨迹进行研究。研究结果表明:在不同典型负荷下前后墙射流均能形成稳定对称的流场,炉内气流扰动较强,有利于煤粉的燃烧燃尽;100%负荷下在炉膛四周产生漩涡,颗粒对水冷壁产生冲刷;炉内合适的煤粉粒径能够保证煤粉在炉内的停留时间。研究结果对锅炉的热态燃烧调整和效率的提高提供理论依据。To study the flow characteristics in furnace of a 1 900 t/h opposed firing supercritical boiler,this paper carried out the corresponding numerical simulation under different load with standard k-ε model. The pulverized coal particle trajectories in furnace were described with DPM model. The study showed that the jets of burners can form a stable and symmetric flow field under different loads. Strong disturbance in the air flow inside furnace is beneficial to the burning of pulverized coal. Eddies appear on the wall under 100% load,and the particles erode furnace wall. The proper pulverized coal particle size can ensure the particle residence time in furnace.

关 键 词：前后墙对冲锅炉 炉内流场 颗粒轨迹 停留时间 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]