US1503876A - Step washing plant for ash, coal, and the like - Google Patents

Description

- I E. BONGARDT I STEP mama PLANT FORISH, co'AL, AND THE LIKE Filed May 5. 1923 In wen-tar Patented Aug. 5, 1924.

ERNST BONGABDT, OF HERSFELD, GERMANY.

STEP WASHING PLANT FOR ASH, COAL, AND THE LIKE.

Application filed May 5,

To all whom 2'25 may concern:

Be it known that I, EnN'sr BONGARDT a citizen of the German Empire, residing at Hersfeld, Germany, have invented certain new and useful Improvements in Step Washing Plants for Ash, Coal, and the like, of which the following is a full, clear, and exact description.

It has already been proposed to separate light and heavy substances owing to their difierent specific weights by the production of a water current in water at rest. None of the devices of known construction attains this object perfectly and with none of the known devices has it been possible to carry out more than two separations. In the separation of boiler ash it has been possible up to the present only to separate the heavy clinker from the coke, and this only in an imperfect manner, the light clinker, the socalled porous clinker, remaining always admixed with the coke. This is due to the fact that the material to be separated is submitted to the action of the water current only once and for a very short time only so that the current, if it has to have any effect at all,

must be very strong, whereby the material to be separated isthrown pell-mell but is separated into its constituents only in an imperfect manner. 4 i i This invention starts from quite different points of view as the fluid is set in motion in such a manner as to create a fluid plane inclined to the horizontal plane with a somewhat wave-like movement, upon which plane the material to be separated is discharged. The part of the material which is of medium density is just carried by the surface of the water, the heavy or denser parts sinking however through the current and the parts of least density are carried away by the current. A further object of the invention is to give to the several parts of the material repeatedly the opportunity to separate from one another so that a thorough separating is ensured. In'this case the wave-like movement may be produced by an air current instead of by a water current, or by the rotation of a shaft with small blades or the like. It is further possible to produce in an air space an air current, instead of in water at rest, an inclined wave-plane so that the separation of the heavy and light substances is carried out by a dry method.

It happens however frequently that it is desira e to ep at material into mor th n 1923. Serial No. 636,948.

three constituents. This is the case for instance with ash from the producers of gasworks. This ash does not only comprise coke which is specifically heavier than the porous clinkers, and lighter than the other clinkers, but also coke which is specifically heavier than most other parts of the clinker. If in the ash, so-called melting slag is also comprised which is specifically heavier than the heaviest particles of coke, it will be necessary to separate the ash into five parts, viz:

Specific weight I: light clinker, so-called porous clinker;

Specific weight II: light coke particles,

Specific weight III: medium heavy clinker,

Specific weight IV: heavy coke particles,

Specific weight V: heavy clinkers (melting slag).

By different arrangements of several inclined water planes or air planes (groups of nozzles) it is possible to construct separating apparatus which permits the separation of the material into any desired number of constituents of different spacific weights or densities.

Another embodiment of the invention serves to absolutely avoid the formation of eddies in the fluid and to ensure a perfect separation.' This form of construction presents further the advantage that the floating parts, comprised in the material to be separated, may be removed from the washing after the separation in the simplest manner.

With this object in view the fluid current coming from the nozzles is made to circulate. Diflierent apparatus for carrying out the separation with the aid of a water current are shown in the accompanying drawing by way of example.

Figure 1 is a vertical s form of the invention.

Figure 2 is a vertical section through a second form thereof.

The apparatus shown in Fig. 1 consists of the settling tank 31, the four parallel in clined planes 32, 33, 34 and 35 arranged the one below the other, the water supply pipe 36 and the over-flow pipe 37. Five collectors are formed by the partitions 38, 39, 40, 41 and 42 which are curved and perforated at the curved parts. The partition 43 forms an ascending shaftfor the overflowing water. The sheet iron bottom plate 44 is perforated in order to prevent solid particles of the material to be sep r ted f rst! se g ection through one into the overflow pipe 37 designates a delivering chute. The apparatus shown in Fig. 2 is of simiconstruction as the apparatus shown in Fig. l, with the difierence however, that the tour inclined planes are not arranged parallel to one another but inclined in opposite directions. In this manner it has become possible to arrange the collectorsnot all on one side of the separating vesselbut on two sides of the same, whereby the devices for conveying the separate constituents of the material'to be separated can be arranged in a much simpler and more convenient manner. The apparatus comprises, same as the apparatus shown in Fig. l, a clearing tank 46, four inclined planes .47, 48, 49 and 50 inclined inopposite directions and arranged the one below the other, the water supply pipe 51, the overflow pipe 52, the partitions 53, M, 55, 56, 57, the partition 58 for the ascending shaft, the perforated sheet iron bottom plate 59 and-the delivering chute60.

The carrying capacity of the inclined planes areregulated by suitable valves and the material is entered from the chute above the upper inclined plane, the latter particles being held in suspense between sheets of that plane while-the other particles pass down between said sheets, each succeeding lower plane acts in the same manne.

The operation of the two apparatus shown in the figures is similar, it being understood that in each instance the uppermost of the four inclined planes possesses the lowest carrying capability, so'that itseparates only the particles possessing the specific weight I. The next following planes separate successively the particles of specific weight II, III and IV, the particles of specific weightV dropping through'all the planes. Theseparate constituents of different specific weights collect at the sides in the collectors, from Where they are removed by means of convenient devices in a similar manner as described above.

I claim y In 'aseparatin'gapparatus,,a plurality of groups of jet producing devices, the devices of each group being arranged in aninclined relation and spaced apart vertically to provide successive spaces through which the material to be "separated might pass, "said groups being'arr'anged in super-imposed relation, the devices forming each group directing their jets in the same direction and approximately normal to the said plane, thus creating a substantially continuous inclined planeot moving fluid whereby when the material to be separated is disposed above the plane of fluid and descends thereon, the

particles of greater density willpass through the plane of. fluid and the'spaces between the devices and form one collection, and the particles of lesser density will be carried down the inclined planeof thefluid and form another collection, said groups being arranged relatively to one another for passing the particles of lesser density successively to one another, the intensity of the fluid in-the jets of the successive groups being progressively less whereby the particles will be separated into collections varying according to their density. r

In witness whereof, I hereunto subscribe my signature.

ERNST BONGABDT Witnesses:

W. W. SCHOTT, O. C. L. B. WYLES.

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