October 15, 1915.

THE COLLIERY GUARDIAN

773

heating. The air for combustion is pre-heated to a
temperature of about 1,000 degs. Cent., giving consider-
able economy in the amount of gas used for heating
purposes, and there is surplus gas equivalent to about
60 per cent, of the total make available for external
purposes. The efficiency of the means provided for
regeneration may be gauged from the fact that the waste

delivered to the tar extractor D. After having been
freed from the tar, the gas is then led into the re-heater
M, where it becomes heated up to the required -tempera-
ture. The heated gas is then conducted along the main
F to the saturator E, in which the ammonia is
extracted by direct absorption in sulphuric acid, and is
recovered in the form of sulphate. The saturator is of

are extracted in the cooling and tar-eliminating opera-
tions are drawn off from the condensers, tar extractors,
etc., and they are conveyed into a separating tank H,
where the tar and ammoniacal liquor separate owing to
their differing densities. The tar flows into the storage
tank I, and the liquor into the storage tank J. The
liquor is pumped into the ammonia still G, where the

Il

View Showing Coke Screens, Loading Belt, and Gantry
for Coke-Storing Ground.





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—-

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View of Twin Coke Car.









Outside View of Benzol House, Oil and Benzol Storage
Tanks and Cooling Frame.



mm

sroc:

Interior of Sulphate Factory, Showing Saturators
and Ammonia Still.



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Interior of Exhauster and Pump House, showing One of the Two
Exhausters and the Two Rotary Tar Extractors.



i. 1

Interior of Exhauster and Pump House, showing Tar, Oil, and
Water Pumps.







gas passes to the chimney at a temperature of under
250 degs. Cent. In explanation of the diagram on the
next page, it may be remarked that the hot gas
direct from the ovens enters the coolers B, where its
temperature is reduced to about 25 degs. Cent. The gas
is then drawn by an exhauster C, by which it is

the totally enclosed type, and the sulphate is con-
tinuously removed therefrom by means of an ejector
working either with steam or compressed air. The salt
is delivered on to a collecting table, and thence into a
centrifugal dryer L, where it is completely freed from
the mother liquor. The products of condensation which

ammonia is driven off by steam and lime in the usual
manner. The vapours of distillation are conducted from
the still and are delivered into the main F, where they
mix with the heated gas and the whole then passes
into the saturator. No live steam is required in
the Hoppers process, either for distilling the liquor