Study on Pollutant Control of Circulating Fluidized Bed Boiler Burning Low Calorific Value Coal
In recent years, more and more low calorific value coal such as slime and gangue are used in circulating fluidized bed (CFB) boilers.Under this condition, it is difficult to control pollutants such as SO2 and NOX due to the change of ash content and particle size of coal.Results implied that when low calorific value coal was burnt in a CFB boiler, the change of circulating ash quantity and particle size distribution of CFB boiler cause the fluctuation of furnace bed pressure, as well as the returning blockage of loop seal, and the deterioration of combustion conditions inside furnace leads to a large fluctuation of pollutants emission.The fluctuation of furnace bed pressure is reduced by adjusting the relationship between air and coal volume and introducing bed pressure to modify the control strategy of primary air flow on both sides of the furnace.Effective measures are put forward to deal with the returning blockage of loop seal in the CFB boiler.The influence of operating parameters such as oxygen on pollutants emission and the coupling relationship between SO2 and NOx emission are both studied through experiments.On this basis, the optimization proposal of control strategy of limestone adding system is put forward, which is applied in a 300MW CFB boiler, and good results are achieved.The results can provide a reference for controlling pollutants of CFB units burning low calorific value coal.
CFB Boiler low calorific value coal controlling pollutants
Wanzhu Wu Ruixin Li Hu Wang Congyang Gu
No.66, Jinye 1st Road, Yanta District, Xian, Shaanxi, China CHN Energy Guoneng Group Co., Ltd., Beijing 100033, 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
167-173
2019-07-19（万方平台首次上网日期，不代表论文的发表时间）