May 8, 1914.

THE COLLIERY GUARDTAN

1021

A Modern German Colliery Plant.

THE EQUIPMENT OF THE FRIEDRICH HEINRICH COLLIERY.

By P. BUSSING, from Gliickauf,
(Continued from page 966).

Screening Plant.

The Schiichtermann and Kremer screening
plant is situated close to the two shafts
(figs. 16 and 17). Out, of, a projected daily
output of 5,000 tons it is intended to deliver
about 1,000 tons of large and mixed coal, the
remaining 4,000 tons (0-80 mm.) having to be
dealt with in the classifying plant.

Two sets of washing plant are provided, each
capable of treating 125 tons per hour, so that the
whole output of 4,000 can be dealt with in 16 hours.

The tubs brought down the gravity incline from
No. 1 shaft, and by the chain creeper a (fig. 16)
from No. 2 shaft, are discharged by the mechanical
tipplers, &1-14,th.e coal falling on to the jig screens
(partly of 3| in. mesh, partly smaller) accord-
ing as large coal or through-and-through coal is to
be sent out. For the latter contingency the screen
bottoms can be closed by flaps. In this case the
finest coal is separated for the time being, which
facilitates work on the picking belts d1_14,from the
ends of which the coal is delivered into the trucks.
The weighbridge indicators are arranged on the
lower screening stage, together with the stop
mechanism and winches operating the shutes of the
picking belts, so that the loading of each truck is
easily controlled. The small coal (below 80 mm.)
falling through the screens is discharged through
hoppers on to the belt conveyors e15 which carry it
away to the 650-ton storage pit / (fig. 17). The
dross from the picking belts is sent down through
small hoppers into tubs, and is either tipped into
railway trucks or sent up the hoist at the shaft,
where it is tipped into a bunker, and can be dis-
charged into trucks if desired, through a shute.

On the fourth set of screens the large coal, after
being picked on the belt <Z4, can be led away to a
breaker gx, from which it is carried by the belt con-
veyors e2 and ex to the pit /. Another breaker </2,
is arranged under the tippler &G, the screen of
which allows all the coal below 80 mm. to fall on
to the belt ex, whilst the large coal is picked on a
shute and passed to the breaker </2, which dis-
charges on to the belt ex. These breakers are for
the purpose of supplying varying quantities of
fines to the washery as required..

The small, coal from the pit f is discharged
through a slide into the bucket elevator and
raised to the screen i in the washery. The larger
screenings are run into the washer 7, the clean nuts
from which pass to the classifying screens kx and
k2,, where they are, separated into four grades,
which run down their respective spiral shutes into
the 50-ton bunkers. Before being sent out these
nuts are passed over jig screens and are simul-
taneously sprayed with clean water, so as to deliver
a product quite free from slack. The washings
from this treatment run into a tank Z, and are
raised by a centrifugal pump to the gutters
leading to the sumps n.

The coarse dross from the washer j is conveyed
by a worm and an elevator, to a compartment
of the washer p, to be separated. The portion
containing no coal is delivered to the dross tower
by a worm o2 and elevator h2i whilst the remainder
is transported to a breaker g3) and is then washed,
with the dross from the fines washer q, in the second
compartment of the washer p, after the coarser
grains have been passed through a small drum r,
to one of the four compartments of the washer j.
When an intermediate product is to be prepared
for boiler coal the breaker g3 is shut off, and the
material passed direct to the hopper s, and con-
veyed in tubs to the pit bank level.

The fines, from 0 to 10 mm., separated in the
screen i are separated from a certain proportion
of dust (0-l| mm.) in a screen Z, this dust being
shot down into the hopper 5, to,be sent to the bank
level. The coarser fines are raised by the elevator
h3, to the fines washers q.

The clean coal is delivered to the sumps z to be
dried. There are 40 of these, each holding 125 tons
(5,000 tons in all). When the, drained coking coal has
become sufficiently dry it is passed over belt con-
veyors to an elevator A4, which, raises it to the
charging tower u, from which it is supplied to the
coke oven; or it may be sent direct to the latter in
hopper trucks if required.

The small dross from the fines washer q is carried
by a worm and elevator to thesecond compartment of
the re-washer py where it is mixed with the crush-
ings from the breaker g3. The recovered fines are
swilled down to the other coking coal in the sump
z, the dross being removed by the worm o2 and
elevator h2 to the tower vj. If nuts are to be
crushed for coking, the Nos. 3 and 4 grades are
delivered from the screens into the sump v. The
elevator A5 takes them up to the crusher g^ from
which they are swilled down to, the sumps.

The washing water clarified in the settling tanks
v2 is pumped back to the washery. The water
draining from the drying towers z runs into a small
sump, and is pumped into the distributing channel
over the dry sumps. When the water becomes too
rich in dissolved salts a portion is drawn off into

the other sumps under the towers 2, and after being
clarified is run away as effluent, the deposited par-
ticles of coal being pumped up into the distri-
buting channel above the sumps. The sludge
drawn off from the bottom of the pump sump v2
passes through gutters to the sump Z, and is
pumped up into the channel above the sumps z.

All the various appliances are driven by direct
current, 220-volt motors. Separate switchboards,
each with its own connection to the power house,
are provided for the screening and washing plants.



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Fig. 16.—Plan of Screening and Washing Plant.

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Fig. 17.—Section of Screening and Washing Plant.









The washery is built strongly, of brickwork
strengthened with iron; and the sump building is
of ferro-concrete (fig. 14). That part of the
washery which is over the rail , tracks is on iron
pillars. All the floors on which tubs are run,
except where tracks are provided, are of smooth
steel plate; the other floors being faced with fluted
plates or concreted.

Cokery and By-Product Recovery Plant.

This part of the plant is on the further side of
the railway sidings. The cokery (fig. 18) consists
at present of two batteries (60 ovens each) of
regenerative ovens; but the final installation will
comprise four such batteries. The ovens (figs.
19-20) have the following dimensions: height to

crown 8| ft., mean width 20 in., length between
doors 35 ft. Each holds 9.2 tons of dry coal, and
gives a yield of 7.6 tons of coke. At present 96
ovens are drawn in the 24 hours, and produce
725 tons of coke. The average time required for
coking is 30, hours. The ovens are charged, through
4 openings in the arch, by an electric truck holding
10 tons, and serving the whole 120 ovens now in
use. It is operated by one man, and takes 1-2
minutes to discharge its contents into an oven.
Each battery has a coke pusher with door-lifting
attachment; and a third one is provided as a
spare.

The air of combustion for the gas admitted
through the nozzles a (figs. 19-20) in the oven walls,
descends through openings b into the distributing
main <?, and flows through the openings d and e
into the regenerator /. From here it ascends
through the flue g into the bottom flue A, and enters
the combustion chamber through ports i above the
nozzles. , The gases of combustion rise through the
pipes k into the horizontal flue Z, and are drawn by







the chimney draught in the second half of the oven
through the pipes kx and openings ix into the
bottom flue whence they pass through the flue
gx into the regenerator j\ and heat the chequerwork.
Finally they emerge through the openings ex and
dx into the ,main c15 and pass away to the chimney
stack. With the gases of combustion taking the
described course, the gas feed pipes are arranged
so as to admit gas to the nozzles a. The opening
b is opened, and bx closed by their respective
dampers, so that the air can only enter at b and
the main cx is connected solely with the regenera-
tor on the one hand and the chimney on the other.

After about half-an-hour, the nozzles and air
intakes are adjusted so as to admit gas through the
nozzles ax and the air through bx. The air of com-