DRYING SYSTEMS

205

The British V.J.B. Three-Stage Steam Circulation Heating Systemfilhe }/
simple method of heating cylinders by blowing in steam, and aftfer it * *
has passed on some of its heat, exhausting the condensed steam through
a steam trap, has two disadvantages: First, rather a long time is required in
which to drive out the cold air from the cylinder to be heated; and, second,
there is much inevitable wastage of steam through the trap. The original
V.J.B. circulation system was designed to eliminate these faults. Pro-
vision of sufficient cocks in the system and skilful design of piping enabled
the air to be rapidly released from the cylinder to be heated, but the main
feature of the system lay in economy of steam consumption. This was effected

FIG. 82.— PATENT STEAM INIET AND WATER OUTLET NOZZLE FOR CYUNDE* AND

This nozzle remains perfectly steam- and water-tight at all pressures up to 260 ib. per square inch and is suiubie for ekher
syphon or bucket condensate ejection and for the straight in feed on calender rods. It is also made in single form
where die steam is fed in at one end and die water ejected at the ocher
by separation of steam from the exhaust from the cylinder, and the continued
use of this steam until it had parted with all its available heat. Direct steam
was not blown straight into the cylinder, but was passed through an ejector,
which drew the exhaust steam from the trap, so using a mixture of fresh and
reduced pressure steam for heating. Steam entering a cylinder was con-
stantly being drawn out and put back again, through the ejector, until it had
parted with all its available heat and become condensed. The two essential
features of die system were the steam trap, which incorporated a sepaiaritoa
chamber for the steam, and the ejector, which relied upon steam for its
operation.