Operation Optimization of Secondary Air in a 300 MW CFB Boiler
Secondary air plays an important role in a CFB boiler.This work reports the efforts on the operation optimization of secondary air for a 300 MW CFB boiler.It includes mainly three parts.First, a 2-D cold test rig was set up and the effects of incident angle, incident velocity and bed suspension density on the injection penetration of secondary air were studied.The results showed that secondary air achieved the maximum penetration depth at the incident angle 30° while other parameters were constant.To increase the incident velocity may lead to the penetration depth increased exponentially.The depth declined significantly with increasing of the solid suspension density.Second, numerical computation was applied to predict the effects of the secondary air in the 300 MW CFB boiler.To simulate the influence of the secondary air on combustion, heat transfer and emissions, a circulating fluidized bed two-zone multi-segment integral coupling model was developed and used.The results gave the references of the secondary injection for the optimization operation.Third, a field combustion test was performed to investigate the effect of the ratio of the secondary air to the primary air on the bed temperature, its uniformity in the furnace and the NOx emissions on the 300 MW CFB boiler.With the references from the lab experiments and simulation predictions, the boiler operated at high efficiency and low emissions.
Circulating fluidized bed 300 MW CFB secondary air optimal operation
Leming Cheng Liyao Li Mengxiang Fang Qinhui Wang Zhenghang Cheng
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
国际会议
Proceeding of 2nd Conference of Circulating Fluidized Bed Boiler ( 第二届国际循环流化床锅炉会议)
青岛
英文
1-11
2019-07-19（万方平台首次上网日期，不代表论文的发表时间）