In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burn...In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burners have been designed and tested in largescale pilot plants as key components of oxy-fuel combustion. These burners face major challenges in terms of their flame stability because of their decreasing stream momentum ratio and increasing carbon dioxide concentration. However, it offers flexibility in adjusting the oxygen concentration in each burner stream. This study aims to provide a comprehensive review of the state-of-the-art knowledge on oxy-coal burner design and operation in power plants. First, the combustion characteristics under oxy-fuel conditions are briefly introduced. Subsequently, the principal requirements and fundamental parameters of the oxy-coal burners are discussed. The development process of oxy-fuel burners is also presented. Moreover, a compatible design strategy and scaling-up techniques are described for oxy-coal burners developed by the authors over the past ten years. The performances of oxy-coal burners in three large pilot oxy-fuel plants worldwide are summarized and compared. Finally, concluding remarks are provided and potential research needs are suggested.展开更多
This study explores the effect of H_(2)O on the characteristics of the oxy-fuel combustion process preheated by a circulating fluidized bed.The preheating and combustion characteristics have been studied in O_(2)/CO_(...This study explores the effect of H_(2)O on the characteristics of the oxy-fuel combustion process preheated by a circulating fluidized bed.The preheating and combustion characteristics have been studied in O_(2)/CO_(2)/H_(2)O and O_(2)/N_(2)/H_(2)O atmospheres.It was observed that the preheating temperature decreased with adding steam.Meanwhile,the addition of steam enhanced the C-H_(2)O gasification reaction,while weakened the C-CO_(2)gasification reaction.As a result,the H2 concentration was increased,while the CO concentration was reduced.H_(2)O was conducive towards increasing the surface area and pore formation of the preheated char,though it had an insignificant effect on the particle size.Moreover,H_(2)O enhanced the preheated char activity,which was helpful for ignition and stable combustion.The NO_(x)emission was observed to increase from 68 to 79 mg/MJ and 62 to 81 mg/MJ in O_(2)/CO_(2)and O_(2)/N_(2)atmospheres,respectively,after adding steam.展开更多
基金supported by the National Natural Science Foundation of China(Grant No. 51906075)Key Research and Development Program of Department of Science and Technology of Jiangxi Province(Grant No. 20223BBG74009)Science and Technology Innovation Project for Carbon Peak and Carbon Neutrality of Jiangxi Carbon Neutralization Research Center(Grant No. 2022JXST01)。
文摘In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burners have been designed and tested in largescale pilot plants as key components of oxy-fuel combustion. These burners face major challenges in terms of their flame stability because of their decreasing stream momentum ratio and increasing carbon dioxide concentration. However, it offers flexibility in adjusting the oxygen concentration in each burner stream. This study aims to provide a comprehensive review of the state-of-the-art knowledge on oxy-coal burner design and operation in power plants. First, the combustion characteristics under oxy-fuel conditions are briefly introduced. Subsequently, the principal requirements and fundamental parameters of the oxy-coal burners are discussed. The development process of oxy-fuel burners is also presented. Moreover, a compatible design strategy and scaling-up techniques are described for oxy-coal burners developed by the authors over the past ten years. The performances of oxy-coal burners in three large pilot oxy-fuel plants worldwide are summarized and compared. Finally, concluding remarks are provided and potential research needs are suggested.
基金This study is supported by the National Natural Science Foundation of China(No.51676187).
文摘This study explores the effect of H_(2)O on the characteristics of the oxy-fuel combustion process preheated by a circulating fluidized bed.The preheating and combustion characteristics have been studied in O_(2)/CO_(2)/H_(2)O and O_(2)/N_(2)/H_(2)O atmospheres.It was observed that the preheating temperature decreased with adding steam.Meanwhile,the addition of steam enhanced the C-H_(2)O gasification reaction,while weakened the C-CO_(2)gasification reaction.As a result,the H2 concentration was increased,while the CO concentration was reduced.H_(2)O was conducive towards increasing the surface area and pore formation of the preheated char,though it had an insignificant effect on the particle size.Moreover,H_(2)O enhanced the preheated char activity,which was helpful for ignition and stable combustion.The NO_(x)emission was observed to increase from 68 to 79 mg/MJ and 62 to 81 mg/MJ in O_(2)/CO_(2)and O_(2)/N_(2)atmospheres,respectively,after adding steam.
