Hydrodynamics of fluidized bed under air and carbon dioxide flows
Oxy-fuel combustion is one of the options for capturing of CO2 from power plants,thats why knowledge in the hydrodynamic of fluidization process in the CO2 atmosphere is extremely important for the oxy-fuel combustion where carbon-rich fuels are combusted in mixture of almost pure oxygen with recycled flue gases.Particle size distribution within the riser is one of the most important parameters influenced on suitable work of whole power plant,because it has main influence on heat transfer in the circulating fluidized bed boiler.This paper contains the impact of fluidization gas in a 3D cold model stand during fluidization of glass beads under the atmosphere of CO2 and air.During test were changed also gas velocities to show its influence on PSD The investigations were carried out in the 3D cold model stand on consists of chamber in the plan of square with the side diameter of 0.1 m,with the similarity to the Lagisza boiler height in the scale of 1:20,connected via a crossover duct to the cyclone.Glass beads separated in the cyclone are returned to the combustion chamber via a 0.05 m I.D.return leg and a non-mechanical syphon.Air or carbon dioxide is fed to the wind box as in the real combustors.Syphon located in the recirculation part has additional wind box where additional air or carbon dioxide is fed to transport recirculated glass beads back to the riser.Cold model is equipped with ports for bottom,circulating,in furnace samples and equivalent of fly ash samples collecting ports.Pressures in the contour of the riser are measured by the Aplisens sensors in 22 measuring ports.The measuring system has an electronic pressure convertor Aplisens of ±2.5kPa and ±10kPa working in current loop as well three 8-canal-operation cards of a high output signal sampling frequency interfaced with a portable computer.PSD of used glass beads were prepared on the base of two scaling methods of the scaled down material taken from furnace of Lagisza 460 Mwe CFB boiler so investigations were not conducted on mono fraction.For PSD analyses were taken only bottom and in-furnace samples – 4 points in the contour of combustion chamber.Such analysis gives possibilities to show also how fed material to the boiler with known PSD is transported in the contour of combustion chamber.Both air as carbon dioxide was fed to the furnace only as primary air/carbon dioxide.
PSD Carbon Dioxide CFB Glass Beads Fluidization
Maciej Komorowski Wojciech Nowak
Institute of Advanced Energy Technologies,Czestochowa University of Technology,Czestochowa,Poland
国际会议
桂林
英文
1-12
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）