US1042293A - Apparatus for compressing precipitates in settling vessels. - Google Patents

Description

F. TIEIEIANN. APPARATUS FOR GOMPRESSING PREGIPITATES IN SETTLING VESSELS. APPLICATION TILED 110 7123, 1911.

{Ah/EIJTU warren snares a it FRITZ TIEMANNJOF BERLIN,

APPARATUS FOR CQMPRESSING PRECIPITATES IN SETTBLEEI'G Original application filed June 9, 1911, Serial No. 601,683. Divided and this application Ir? Specification of Letters Patent.

1911. Serial No. 661,9$7.

To all whom it may concern. I

Be it known that I, Fnrrz TIEMANN, director, a subject of the German Emperor, residing at Berlin lrV., 259, Kurfiirstendamm, Germany, have invented certain new and useful Improvements in Apparatus for Compressing Precipitates in Settlin Vessels; and I do hereby declare the following to bee full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improved apparatus for compressing precipitates in settling vessels.

The apparatus is adapted to carry out the process set forth in my Patent, No. 1,007,823, dated Nov. 7, 1911, of which this application is a division. 7

The novel features of the invention will appear clearly from the following description and claims. v

In the accompanying drawings, Figure 1 is a vertical central section of an apparatus embodying the invention, and Fig. 2 is a similar view of a modified apparatus.

Referring particularly to Fig. 1, the same shows a settling vessel or receptacle into which the juice or liquid to be purified is introduced at the top, as by means of an inlet pipe E. The bottom of the vessel or receptacle is closed under normal conditions. Arranged interiorly of the vessel and disposed in a substantially vertical row, one above the other, are separating bells each having associated therewith an outlet for the purified juice, the outletspassing through the side Wall of the vessel at points corresponding to the location of the bells. In the embodiment under consideration there are four main separating bells T,,, T,, T T the corresponding juice outlets of which are indicated at A A,, These outlets are equipped with suitable closing devices by means ofevhich the speed of thejuice rising in the corresponding bells and passing out of the vessel under the pressure of the liquid in the latter, can be regulated mitted to rise in bells vided with corresponding outlets specti ely, similar to those u.l tioned and ii rewise equipp d i for regulating the of liquid disc from the vessel at those points.

The operation of an apparatus oi character is substantially as follows; The juice out-letsfi A A so by their closing deyics that the 0.2 mm. per secor Under nese conditions the regulating device in connection with the bell T should be adjusted to permit the juice to rise in'the hell not faster than say 0.15 mm, per second and the low-est would be so controlled to permit the un- Ward movement ot-the juice only mately 0.05 mm. per second. The ve filled with liquid up to the inlet it; 1 juice passes-With a certain spc d in a dew ward direction and first reaches the separating bell T The precipitates then downward around said bell While the juice, by reason of its lower specific l I rises in a counter current in the b the speed previously indicated an charged through the outlet l t understood, of course, that the solids c. cipitates in the juice passing around bell T are subjected to a liquid pr corresponding to the distance from E to edge of the bell, While the passi of? of pure juice under the bell pros. relatively slight counter-pressure, which corresponds to the distance from the edge of the bell to the level of the outlet in. it will be obvious how these pr: e aiit ences produce the t "n suci' J o" moon or the juice out of the nests or tut cipitates, and the discharge or pi from the bell and from the apparatus. a portion of the juice is now mixture of less juice and proper-ironately more precipitate passes from the bell the bell T with less speed, where cg portion of the remaining juice i1 condv off in a counter current at a speed of approximately 0.2 mm. per second. The dis charge speed of the juice in con'ipai'iwn to the speed of the juice pas lug downward is therefore appreciably '.-;1t1 than hetero,

need by th e that in the bell T owing to the provision or lumps.

of the bells located beneath the latter, the counter-pressure of liquid at each stage of the operation corresponding only to the coinparatively short distance between the edge of the corresponding bell and the outlet assoc'iated with the latter. Accordingly the proportion of slimes or precipitates in the" juice increases step by step as-the'mixture" passes from bell to bell, the downward speed of thejuice continually decreasing and the discharge speed of the pure juice continually increasing with respect to such first named speed. A continually increasing compression of the material separated out is thereby effected, with a corresponding step by stepextraction of the juice from the nests The comparatively slow discharge speeds used in connection with the lowermost separating bells are necessary'because the masses of slimes are highly compressed in the lower part of the vessel and therefore contain comparatively little juice.

In view of the necessary small speed of the I upward travel of juice, on account of the bulky specifically light precipitates, these settling vessels have to be of large diameter. It has been further found that the rising juice entering the uppermost main separating bell, or the precipitates of the said juice falling down, must have been already eX- posed to high liquid pressure in order to compress under strong pressure the precipitates partly consisting of vegetable fibers or cells, so that they should become of suf- -ficiently great specific gravity for sinking.

These apparatus would have therefore to be I i worked with such a large quantity of'useful 50 liquid that the vegetable juice, apart from other damage, would be liable to decomposition.

The apparatus shown in Fig. 2 has been designed with a view to obtain the neces sary high pressure for compressing the precipitates, while avoiding the above drawback. I

The pressure required'for the uppermost main separating bell T for instance one atmosphere, is obtained here by means of stand pipes S between the upper and the bottom portions of the apparatus, so that the pressure of the about 10 meters of liquid at T requires only aconsumption of 12 cubic meters useful liquid, while an apparatus such as that shown in Fig.1, with the same diameter of, say, four meters and also with a pressure of one atmosphere at T would require 125 cubic meters of liquid.

In the apparatus shown in Fig. 2, juice is admitted at E. A,, A A are used for the discharge of pure juice from the main separating bell T and the stage bells T T with a speed reduced in stages to the desired degree. L is used for discharging the air,

and D for removing the scum rising upward.

The removal of the precipitates is eflected in both apparatus at the bottom through N as soon as the precipitates are sufficiently compressed by the exhausting of the nests of juice.

What I claim is 1. In apparatus for compressing precipitates in settling vessels, the combination of a settling vessel, means associated therewith for establishing a downward current of liquid therein, means for inducing a plurality of rising counter-currents in said downward current and for carrying 0E such counter-currents from the vessels, and means for producing an increasing pressure difference between the downward current and the several counter-currents.

2. In apparatus for compressing precipitates in settling vessels, the combination of a settling vessel, means associated therewith to establish a main downward current of liquid in said vessel, means to induce rising counter-currents of liquid in said main current and to conduct such count-ercurrents ofi": to the exterior of the vessel, and means for regulating the speed of the re spective discharging counter-currents.

' 3. In apparatus such as described, the

combination of a settling vessel, separating bells arranged'therein at dilIerent heights and having discharge outlets leading off from inside the vessel, and closing devices associated with said outlets to regulate the speed of the outflowing liquid.

4. In apparatus such as described, the combination with a settling vessel, of a plurality of separating bells one above the other, and an individual discharge from each bell leading ofi' from the vessel where. by the discharging streams are kept separate.

5. In apparatus such as described, the combination with a settling vessel having an inlet at the top and an outletat the bottom, of a vertically arranged series of separating bells in said vessel, the lowermost bell being arranged closely adjacent the bottom of the vessel, discharge devices to conduct the liquid. in the respective bells out of the vessel, and means to regulate the speed of the dischargingstreams of liquid.

6. 1n apparatus such as described, the

at Effrant wei 'h'ts and having means to In testimony whereof I affix mysignature,

ciischmpe iiqmu Ex-0m the vesseL anfl stand in presence of two Witnesses.

FRITZ TIEMANN.

as communication with the several L W12; 20 !.'y pressure dif nee of I Wfln esses: 1 A a n sud WOLDEMAR EiAUPT;

HENRY HASPER.

Images