1D modeling on the material balance in CFB boiler

Effect of furnace pressure drop on heat transfer in a 135MW CFB boiler

“…Determination of these values was performed by comparing results from calculation with field test data (particle size distribution of the bed materials and pressure drop along the furnace height) [25] . By optimization of the parameters, the 1-D model can predict the pressure drop and temperature distribution under different loads which agree well with the field test data, as shown in Figure 1.…”

“…Changes in the pressure drop directly influences the solid density profile in the furnace and therefore affects the heat transfer coefficient of heating surfaces. A 1-D CFB combustion model developed at Tsinghua University was used in this study [25][26][27][28] to investigate the influence of pressure drop and the results were validated with field tests carried out in a 135 MW e CFB boiler in the city of Baode, in the Shanxi province in China. The temperatures in the furnace under different pressure drops, boiler loads and size distributions of the coal particles were analyzed.…”

Estimation of Solids Circulation Rate from Risers at High Solids-to-Gas Density Ratios

“…Mathematical models have been described in the literature (Kunii and Levenspiel, 1991) to estimate solids outflow. However, these mathematical models still require various correlations for certain parameters (Gungor and Eskin, 2007;Smolders and Baeyens, 1998;Yang et al, 2005). Direct numerical simulations involving constitutive governing equations provide the most accurate information about the hydrodynamics in fluidized beds but require a substantial computational effort to find the converging solutions (Bi and Grace, 1995;Ma et al, 2009).…”

Simulation of mass balance behavior in a large-scale circulating fluidized bed reactor

“…A 1D model of a CFB boiler, which is widely used in the literature, emphasizes some important factors that influence the ash balance in CFB boilers such as ash formation, attrition and size reduction, residence time, and segregation in a dense bed. The model predicts only the mass balance at different operating loads in the same boiler (Yang et al, 2005) but does not take into account combustion processes. The dynamic simulation model of the particle population in a CFB combustor with an external heat exchanger is widely known.…”

“…Based on the simulation model, it is possible to control bed hydrodynamics and monitor large-scale CFB boilers. Nevertheless, previous simulations of mass balance still have some limitations when describing the particle properties and physical/chemical processes in CFB boilers (Yang, Yue, Xiao, Lu, & Liu, 2005). A 1D model of a CFB boiler, which is widely used in the literature, emphasizes some important factors that influence the ash balance in CFB boilers such as ash formation, attrition and size reduction, residence time, and segregation in a dense bed.…”