Volume BSH 2:
Part 1 Selection Guide
The aim of this
part is to help the user to choose a suitable mechanical conveyor
for a particular application. The emphasis of this report
is on the use of mechanical conveyors for unsaturated damp
powders and cakes, consisting of a three-phase mixture of
solid, liquid and air. However, the report can also be used
to select a conveyor for a dry powder or for a fully saturated
paste or slurry.
The report contains
a step-by-step procedure to enable the user to make an initial
selection of the most suitable types of mechanical conveyor
for a particular application. This procedure is illustrated
by the use of a worked example. the report also contains advice
on discussing requirements with conveyor manufacturers once
the initial conveyor selection has been made. This advice
is in the form of a checklist for each type of conveyor. These
checklists can be used even if the user has not used this
report to make the initial selection.
Volume BSH 2:
Part 2 Review of Screw and Vibratory Conveyors
This part examines
in detail two commonly-encountered conveyors in the bulk solids
handling field, viz screw and vibratory conveyors. Screw conveyors
are frequently used with wet materials but problems such as
hold-up at hanger bearings or adhesion of the material to
the shaft and flights can be difficult to solve.
Vibratory conveyors
are not commonly used with wet materials because of the possibility
of the material adhering to the trough and not being conveyed.
However, they do have some particular advantages over other
types of conveyor, such as ease of cleaning, and are worthy
of consideration.
The part describes
the important features of screw and vibratory conveyors and
their application to wet solids. Specification of these conveyors
is discussed and particular consideration given to the prediction
of power consumption. One of the main aims of the part is
to identify research needs in screw and vibratory conveying
of wet solids. However, there is very little information in
the literature to indicate where these needs exist. A survey
of equipment manufacturers which was intended to help in this
was therefore carried out and has revealed a wide disparity
of views as to the design changes to adopt for wet as opposed
to dry materials. A provisional programme of work to enable
recommendations to be made for the design of screw or vibratory
conveyors for wet solids is included in this report.
Volume BSH 2:
Part 3 Design Guide for Screw Conveying
The aim of this
guide is to enable the user to specify a screw conveyor for
a particular application. This involves attention to both
screw conveyor design and the specification of its operating
conditions. The guide gives advice on designing for different
material properties and different applications. It explains
how to determine screw size and speed, and power requirements.
It also contains advice on discussing requirements with conveyor
manufacturers.
