论文信息 - Some issues in modelling bubbling and circulating fluidized-bed coal combustors

Some issues in modelling bubbling and circulating fluidized-bed coal combustors

Abstract Fundamental aspects of coal combustion in the two types of atmospheric fluidized combustors, i.e. those based on bubbling and on circulating technologies, have been studied in order to determine those variables which play a dominant role in the reactor performance. The analysis is based on two relatively simple models, which take into account carbon surface reaction, intraparticle and external diffusion as well as phenomena of comminution of coal and its char. Performances of the two types of fluidized-bed combustors are discussed with reference to coal combustion only, without taking into consideration the emission issues. Sensitivities of main output variables to changes in fuel properties, design and operating variables are evaluated.

[1] P. Salatino,et al. Comminution of carbons in fluidized bed combustion , 1991 .

[2] Charles C. Watson,et al. Strategy of Process Engineering , 1968 .

[3] R. Essenhigh,et al. Autocorrelations of kinetic parameters in coal and char reactions , 1990 .

[4] Charles N. Satterfield,et al. Mass transfer in heterogeneous catalysis , 1969 .

[5] U. Arena,et al. Carbon attrition during the fluidized combustion of a coal , 1983 .

[6] G. Rosen. The mathematical theory of diffusion and reaction in permeable catalysts , 1976 .

[7] U. Arena,et al. Carbon attrition during the combustion of a char in a circulating fluidized bed , 1990 .

[8] John R. Grace,et al. Effect of bubble interaction on interphase mass transfer in gas fluidized beds , 1981 .

[9] U. Arena,et al. Modelling of circulating fluidized bed combustion of a char , 1991 .

[10] G. Russo,et al. The Calculation of Carbon Load and Axial Profiles of Oxygen Concentration in the Bed of a Fluidized Combustor , 1979 .

[11] Piero Salatino,et al. Secondary fragmentation of char particles during combustion in a fluidized bed , 1989 .