Much of
the material has been developed by SPS over a number
of years, (The use of small scale tests in the selection
of dryers: C G Moyers and C G J Baker) has also been
incorporated. It also draws on material from Crystallization
Manual CR III.1 on how crystallization and downstream
processing interact. A revised version to reflect changes
incorporated in the algorithm during the conversion
of the associated DRYSEL expert system to Windows.
Volume
DRY II Part 1 Dryer selection algorithm.
This
is a detailed description of the process of dryer selection
and of the new SPS selection procedure. After an initial introduction,
the principal types of dryers are briefly listed and classified
in Chapter 2. The classification is more detailed than that
in Manual Volume I and is based on the underlying scientific
principles which affect selection; thus apparently similar
dryers such as tray and rotary units are divided into conduction,
cross-circulated, through-circulated and dispersion types.
A literature survey (Chapter 3) reviews the scanty material
previously published on dryer selection.
Drying is then
set in the context of the overall flowsheet in Chapter 4,
noting interactions with particle formation and dewatering
processes. The SPS selection algorithm is then described in
Chapter 5. It has five steps: data collection; basic choice
of categories; short-listing of dryer types; refinements and
subtypes; and evaluation. The search procedure has a tree
structure which is equipment-based. However, material-based
considerations are equally important and the complete set
of selection rules, organised on this basis, are listed and
explained in Chapter 6.
Appropriate small-scale
tests for determining solids properties and drying characteristics
are described in Chapter 7. Rough sizing and costing procedures
are given in Chapter 8 to allow a quantitative comparison
between dryers, using a new SPS method based on gas flow through
convective dryers or heat transfer area in contact dryers.
A number of worked examples are also included as Chapter 9
to illustrate the algorithm in operation.
An appendix gives
a checklist of the data needed in order to run the algorithm
in an easy-to-use form, together with a results form for hand
calculation.
Volume
DRY II Part 2 Dryer manufacturers database.
This is a quick reference guide
to SPS dryer manufacturers and their products, produced as
a result of a suggestion of the Drying Panel. Each manufacturer
supplies a brief two-page guide giving the types of dryer
they manufacture, practical test facilities and contact names
and addresses. Manufacturers are responsible for updating
their own entries as necessary. The on-line version on CD-ROM
will be updated every six months if required, but it is not
planned to reissue paper versions regularly. Other Panels
are now producing similar databases and the overall compilation
may be issued in the Mini-Manual series.
Volume
DRY II Part 3 DRYSEL User Guide.
This is the printed User Guide
to the DRYSEL expert system software (DOS version) which implements
the design algorithm in DRY II.1.
