Pressurized fluidized-bed combustion part-load behavior. Volume I. Summary report Page: 118 of 122
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- A2.1 -
Sorbent elutriatiori
To avoid ambiguity, dolcmite is expressed on an inert basis, i.e,
(100 - % H20 - % Cl - elemental carbon - % C02 - % S03 ) %
Consider a sorbent ash feed rate w., having a fines fraction f
(i.e. material smaller than d^). if the sorbent ash actually
elutriated, expressed as a fraction of the sorbent ash input, is
fje, then the rate of production of fines in the bed is
The rate of fines production due to attrition and abrasion can be
expected to be proportional to the bed weight, W^, the dolcmite
content of the bed, E,, and sane function of the velocity in the
bed such as (U -
The rate of fines production due to decrepitation is complex, but
is likely to be related to the feed rate and to the rate of evolution
of C02 For the moment the extent of calcination of the bed particles
<=, is taken as a likely indication of the rate of evolution.
It is suggested that the total rate of fines production is given by
an expression of the type
Data generated by seme 24 tests on the Leatherhead PFBC are given
in Table A2 and a correlation has been developed along the lines
indicated above to give the expression
A comparison of observed and predicted values (f, - f, ), based on
the above expression, is given in Fig. A2 and straws a reasonable
correlation. However, examination of this expression shows that
the contribution of the 2nd and 3rd terms (i.e. 86.1 x 10 3 / w^
-0.0329) is small and suggests that decrepitation due to C02
evolution is negligible in PFBC situations. The same is not true
at atmospheric pressure, of course, where the evolution of CO^ from
limestone can be extremely rapid.
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lit)
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Roberts, A. G.; Pillai, K. K.; Raven, P. & Wood, P. Pressurized fluidized-bed combustion part-load behavior. Volume I. Summary report, report, September 1, 1981; United States. (https://digital.library.unt.edu/ark:/67531/metadc1088075/m1/118/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.