2. Idea of Mass Balance Model
The principle of creating a mathematical mass balance model in a
supercritical CFB boiler under steady-state operation is shown in Fig. 1.
The essence of this approach is balancing of optional parameters by
division of particle size distribution into classes. A spherical shape of
particles was assumed. The division of particle distribution into classes
with respect to their mean size was performed. The span of particles
size is characteristic of the each class. The class is represented by the
mean particles size, which is located in the middle of the classes. This
division is necessary to obtain balance formulae for a given particle
class. It should assume, that in each class shrinking core model, i.e. the
particles found in the class reduce its own size under the influence
of chemical reaction (i.e. fuel combustion) and physical processes
(e.g.: attrition, fragmentation, coagulation etc.). It is possible for particles
to migrate from the class with greater span to a class with smaller
span. Generally an increase of particle size is also possible, i.e. the migration
fromthe classes about smaller span to the classeswith larger spans.
2. Idea of Mass Balance Model
The principle of creating a mathematical mass balance model in a
supercritical CFB boiler under steady-state operation is shown in Fig. 1.
The essence of this approach is balancing of optional parameters by
division of particle size distribution into classes. A spherical shape of
particles was assumed. The division of particle distribution into classes
with respect to their mean size was performed. The span of particles
size is characteristic of the each class. The class is represented by the
mean particles size, which is located in the middle of the classes. This
division is necessary to obtain balance formulae for a given particle
class. It should assume, that in each class shrinking core model, i.e. the
particles found in the class reduce its own size under the influence
of chemical reaction (i.e. fuel combustion) and physical processes
(e.g.: attrition, fragmentation, coagulation etc.). It is possible for particles
to migrate from the class with greater span to a class with smaller
span. Generally an increase of particle size is also possible, i.e. the migration
fromthe classes about smaller span to the classeswith larger spans.
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