Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure

作     者：Oris CHANSA Zhong-yang LUO Wen-nan ZHANG Chun-jiang YU Oris CHANSA;Zhong-yang LUO;Wen-nan ZHANG;Chun-jiang YU

作者机构：The State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China Department of Chemical EngineeringMid Sweden University85170 SundsvallSweden 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2021年第22卷第2期

页      面：116-129页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Project supported by the National Science Foundation Cooperation of China and USA(NSFC-NSF)(No.51661125012) Project of the State Key Laboratory of Clean Energy Utilization,Zhejiang University,China 

主　　题：Oxyfuel co-combustion Equilibrium calculations Chemical kinetic reactions Mineral’s identifications Thermogravimetric combustion 

摘      要：Combustion of biomass or coal is known to yield aerosols and condensed alkali minerals that affect boiler heat transfer *** this work,alkali behavior in the pressurized oxyfuel co-combustion of coal and biomass is predicted by thermodynamic and chemical kinetic *** of solid minerals is evaluated by X-ray diffraction(XRD)analysis of ashes from pressure thermogravimetric *** indicate that a rise in pressure affects solid alkali minerals negligibly,but increases their contents in the liquid phase and decreases them in the gas phase,especially below 900℃.Thus,less KCl will condense on the boiler heat transfer surfaces leading to reduced *** the blend ratio of biomass to coal will raise the content of potassium-based minerals but reduce the sodium-based *** alkali-associated slagging in the boiler can be minimized by the synergistic effect of co-combustion of sulphur-rich coal and potassium-rich biomass,forming stable solid K2SO4 at typical fluidized bed combustion *** modelling based on reaction mechanisms shows that oxidation of SO2 to SO3 plays a major role in K2SO4 formation but that the contribution of this oxidation decreases with increase in pressure.