DE2844038A1 - Two-component contact column - with L=shaped tubes joining alternate two decks as stirring elements for intimate mixing - Google Patents

Abstract

The Parent Patent described a multi-deck column for the intimate mixt. of two components in counterflow, with stirring elements on each deck to produce a partial recycling. The stirring elements are designed as tubes of inverted L-shape which are offset relative to each other and bridge over two decks in turn. This widens the range of application of such a column (sugar dissolution, production of milk of lime) because of an improved intimate mixing effect.

Description

"Device for intimate mixing

of two material components, at least one of which is liquid. " The invention relates to a device for the intimate mixing of two material components, at least one of which is liquid, consisting of a standing cylindrical Container with an inlet for the one substance component at one end its other end has an outlet for the mixed solution and an enema at one end for the second material component and by approximately horizontally arranged Intermediate floors are divided into superimposed chambers, which are over in the intermediate floors provided passage openings with one another in fluid-exchanging connection stand and are acted upon by stirring elements that are driven on a perpendicular and are mounted centrically guided by the container shaft, in approximately horizontal Circulate levels and through a partial flow return of mixed solution against the The mixed solution is mixed in the direction of flow from the inlet to the outlet effect the one chamber with the mixed solution of the adjacent chamber, according to patent .. .. ... (file number P 28 33 348.4).

Such an embodiment corresponds to the pre-liming vessel from Naveau ("Technologie des Zuckers", Verlag M. & H. Schaper Hannover 1968, p 271). This previously known preliming vessel consists of a standing cylindrical one Vessel with a vertical shaft and is supported by horizontal shelves, the one have central opening and several openings on the circumference, divided into chambers. Large blades are mounted on the vertical shaft in every other chamber when rotating, a stream of juice centrifugally through the chamber and outer openings to the shoveless adjacent compartments above and below, where it is mixed with the existing juice. From these shovelless chambers, which are short Equipped with stirring arms, the juice flows through the central openings in the intermediate shelves back to the neighboring chambers. The raw juice enters the first tangentially at the top Chamber a. The lime required for processing is proportional to the flow rate Introduced below into the last chamber, from which the prepared juice is pumped out.

The raw juice obtained in the extraction is made in such facilities in about seven levels formed by the individual chambers with a pH of 6.4 increased to a value of 11.8 by adding about 0.15 to 0.2% CaO.

This increase in pH should take a total of approx. 16 up to 20 minutes. This exact adherence to this time is of great importance for the preparation process.

In the device explained at the beginning, the internal circulation, those in the chambers with blades in the centrifugal direction and in the blades loose Chambers in centripetal direction takes place, a reflux of processed juice after reached above, so that the pH levels from below upwards according to the Principle of progressive pre-liming. These stages are from the Depending on the number of revolutions and can as well as the throughput time and the connection opening be calculated between the chambers.

The main disadvantage of the previously known device according to the system Naveau lies in the difficulty of adjusting the pH value in the individual chambers. In practice, therefore, pre-liming devices are used almost exclusively after the System Brieghel-Müller used (loc. Cit. Page 270). This is one in cross-section approximately U-shaped, open at the top, lying horizontally Trough.

One advantage of this known device is that it is easy to adjust the pH values. A major disadvantage, however, is the need to remove this system for thermal reasons within the factory building. Is disadvantageous also the large space required by the horizontal arrangement.

The invention according to the main patent was based on the object to improve the device explained at the beginning with regard to the partial flow return, in order to achieve more exact pH values in the individual chambers. Was sought in other words, an improvement in the mixing of two liquid material components.

The invention according to the additional application is superordinate to the main patent the task is based on further training of the facility according to the main patent taking advantage of the improved intimate mixing of two material components To enlarge the application range of such facilities.

This object is achieved according to the invention in that the stirring elements for the partial flow return are formed by a pipe system that consists of several, approximately angled and each connecting two chambers with one another There are tubes, each of which has a tube with its own suction opening End of an approximately perpendicular pipe leg into one of the two Chambers and with the end having an outflow opening of its approximately horizontal extending pipe leg opens into the other of the two chambers.

The difference between the radial distances between the suction opening and the discharge opening from the central axis of rotation is essential for this new system. If the radial distance between the suction opening is denoted by r1 and that of the discharge opening by r2, then with an angle tube according to the invention rotating about the above-mentioned vertical axis, a differential pressure is established at the above-mentioned openings according to the relationship Accordingly, the new system for the partial flow return works in terms of flow according to the principle of a centrifugal pump.

The amount to be conveyed or circulated is determined by the speed the vertical drive shaft or by changing the intake cross-section in particularly easy to adjust. It is therefore advantageous according to the invention, when the suction opening has a regulating element that changes its suction cross-section.

In the context of the invention, it is not essential that the perpendicular and centrally guided through the container drive for the pipe system by a Wave is formed. It would be e.g.

possible, the shaft through a lattice structure having a hollow interior to replace, in which the individual angled tubes could be hooked particularly easily. It is only essential that all angle tubes rotatably with a central drive are connected.

Furthermore, it is not essential within the scope of the invention; that the The pipes forming the pipe system are each designed to be exactly angled. Decisive it is rather that the outflow opening has a greater radial distance from the axis of rotation as the suction opening, and that each tube rotates about a vertical axis.

In the construction according to the invention, the adjustment mechanisms for the regulating elements changing the intake cross-section in a particularly simple manner arrange. Thus, for example, a linkage from below through the hollow central drive lead up to the individual control organs. The real ones Adjusting devices for the linkage can then be used on the container receiving unit Foundation can be arranged. However, it is also possible directly in the area each control element on the pipe itself or on the central drive one pneumatic or to arrange hydraulically operated, maintenance-free adjusting cylinders.

In the construction according to the invention, each promotes around the vertical Rotary axis rotating angle tube an exactly adjustable partial flow from a bottom chamber in an overlying chamber.

The device can be particularly advantageous for the production of Use lime milk. In this case it is useful if at the upper end of the cylindrical The container has an inlet for burnt lime and an outlet for the milk of lime and at the lower end of the container there is an inlet for water and an outlet for granular ones Components are provided, the horizontally extending pipe legs each Tube rotates in the respective upper of the two associated chambers.

It is created by intimately mixing the water with the quick lime Milk of lime. Since granular components are also carried along with the burnt lime, it is of great business importance to have these granular ingredients to be separated from milk of lime before the latter is fed to a further process, otherwise the downstream fittings, pumps, pipes, etc. considerable wear and tear would result. The separation of these granular components from the milk of lime is particularly simple and with the device according to the invention to be carried out safely: It is only necessary to ensure that within the Tank the rate of rise of the water introduced into the tank at the bottom is lower than the rate of descent of the granular constituents. Are the through openings provided in the intermediate floors in an expedient manner on the circumference the intermediate floors are arranged, which in turn; n advantageously slightly conical can be trained then the granular components migrate along the inner wall of the container from chamber to chamber downwards, wherein they from the water flowing upwards from adhering, usable lime to be freed. Which is located near the point of entry of the water on which it is located expediently downwardly tapering bottom of the container collecting granular Components can be withdrawn here via the aforementioned withdrawal.

The great advantage of this device is that in one The only device that produces the milk of lime and the granular components that are carried along can be discharged lime-free. The circumferential pipe system according to the invention ensures this for good mixing, with a additional circulation in the direction of flow of the water, i.e. from bottom to top he follows. Since the suction openings of the pipes are in the middle of the container, will the sucked mixed solution in each case free of granular components in the above Funded lying chamber, from where they are close to the inner wall of the container from the pipe outlet moving on a circular path and partly with the pipe outlet in this Area of granular matter sinking downwards, flowing downwards.

This gives the granular components a special washing effect as well as a special conveying effect of even the finest grains towards the bottom of the container guaranteed.

The new facility can also be used in an advantageous manner for resolution used by sugar. In this case it is advantageous if at the top of the cylindrical container an inlet for sugar as well as for dissolving liquid and at the bottom of the container there is a drain for the clarification intended be, the horizontally extending pipe legs of each pipe in the respective revolves around the upper of the two associated chambers.

A separate, separate, or a common inlet for both material components can be provided.

In the sugar industry, sugar is extracted from juice The sugar is normally obtained in three consecutive process steps. In the second process step (raw sugar 2), the sugar is removed from the centrifuge process the first process step (white sugar 1 or 2) with the third process step (Post-product) the sugar from the centrifuge process of the second process step won. The sugar obtained in this way from the second and third process step is redissolved, whereby the clarification obtained in this way becomes white sugar in the first process step is processed.

When using the device according to the invention, the sugar is upper Area of the cylindrical container together with the dissolving liquid, e.g. the condensate can be given up.

The dissolving process begins immediately, with condensate and sugar be mixed by the rotating agitator.

The complete dissolution itself takes place in the amount of throughput and the specified dwell time for the container volume. Through the pipe conveyor system becomes a subset of the mixed solution consisting of sugar and dissolving liquid in each case from a lower chamber to the chamber above and thus opposite the general direction of flow. This results in a particularly good one Mixing and even dissolution of the sugar. This can be intensified by that the passage openings provided in the intermediate floors alternate only on the circumference or are only arranged in the center of the intermediate floors.

In the drawing are two exemplary embodiments of the invention shown. They show: FIG. 1 in a schematic representation Vertical section through a device for the production of milk of lime; Figure 2 in a representation according to Figure 1 a device for dissolving sugar and figure 3 shows, on an enlarged scale, a section along the line III-III in FIG.

According to Figure 1, the device shown consists of a standing cylindrical container 1, which has a bottom 2 which tapers conically downwards has, on which an inlet 3 is arranged for water. Directly below the container lid 4 there is an outlet 5 for milk of lime, which exits through free overflow. Also directly below the container lid 4 is an inlet 6 for fired Lime provided.

The container 1 is arranged in eight superimposed shelves 7 Chambers 8 divided. All intermediate floors 7 are slightly conical towards the top and only have passage openings 9 on their circumference, through which the individual Chambers 8 are in fluid-exchanging connection with one another.

A shaft 10 is guided through the container 1 vertically and centrally, driven by a drive, not shown will and rotates with the angular velocity CJ.

A pipe system consisting of several, approximately angled tubes 11 consists.

Each tube 11 connects two chambers 8 with one another and opens with it its lower end having a suction opening 12 is approximately perpendicular extending pipe leg 11a in the lower of the two chambers and with the end of its approximately horizontally extending end having an outflow opening 13 Tube leg 11b in the respective upper of the two chambers.

In the container bottom 2 there is also a withdrawal 21 for granular components intended.

The dashed and arrows line 16 shows the flow path of the water from below through the container 1 through to the top.

The device shown in Figure 2 corresponds essentially according to FIG. 1. However, here at the upper end of the cylindrical container 1 an inlet 6 for sugar and for a dissolving liquid and at the bottom 2 of the container a process 5 provided for clarification. In addition, those in the intermediate floors 7 provided passage openings 9.14 alternately only on the circumference or only in the center the intermediate floors arranged. The dashed line 16 shows the flow path of the Mixture of sugar and dissolving liquid through the top of the container down to the outlet 5.

FIG. 3 shows the arrangement and design of one shown in FIG Tube 11 on an enlarged scale. In this illustration, however, are the intermediate floors 7 not conical, but aligned exactly horizontally. In this representation is it can be seen that the suction opening 12 of each tube 11 has its suction cross section having changing control member 15.

The arrows 17 indicate the zigzag flow path of the .Mischlösung through the container 1. The arrows 18, 19 and 20 symbolize the partial flow return.

Blank page

Claims (8)

Claims: 1. Device for the intimate mixing of two material components, at least one of which is liquid, consisting of a standing cylindrical Container with an inlet for the one substance component at one end its other end has an outlet for the mixed solution and an enema at one end for the second material component and by approximately horizontally arranged Intermediate floors are divided into superimposed chambers, which are over in the intermediate floors provided passage openings with one another in fluid-exchanging connection stand and are acted upon by stirring elements that are driven on a perpendicular and are mounted centrically guided by the container shaft, in approximately horizontal Circulate levels and through a partial flow return of mixed solution against the The mixed solution is mixed in the direction of flow from the inlet to the outlet effect the one chamber with the mixed solution of the adjacent chamber, according to patent .. .. .... (file number P 28 33 348.4), d u r c h e k e n n -z e i c h n e t, that the stirring elements for the partial flow return are formed by a pipe system are that out several, approximately angularly formed and in each case two chambers (8) connecting pipes (11) consists of which each tube approximated with its one end having a suction opening (12) perpendicular pipe leg (via) into one of the two chambers and with the end of its approximately horizontally extending end having an outflow opening (13) Pipe leg (1lb) opens into the other of the two chambers. 2. Device for the production of milk of lime, characterized in that that at the upper end of the cylindrical container (1) an inlet (6) for fired Lime and a drain (5) for the milk of lime and at the lower end of the container Inlet (3) for water and an outlet (21) for granular components are provided are, the horizontally extending pipe legs (body) of each pipe (11) in each of the upper of the two associated chambers (8) revolves. 3. Device according to claim 2, characterized in that the in the intermediate floors (7) provided through openings (9) on the circumference of the intermediate floors are arranged. 4. Device according to claim 1 for dissolving sugar, characterized in that that at the upper end of the cylindrical container (1) an inlet (6) for sugar as well for dissolving liquid and at the lower end of the container a drain (5) for the clarification are provided, the horizontally extending pipe legs (11b) of each pipe (11) revolves in the respective upper of the two associated chambers (8). 5. Device according to claim 4, characterized in that the in the intermediate floors (7) provided through openings (9, 14) alternately only on the circumference or are only arranged in the center of the intermediate floors. 6. Device according to one of the preceding claims, characterized in that that the bottom (2) of the container (1) tapers conically downwards. 7. Device according to one of the preceding claims, characterized in that that the intermediate floors are slightly conical. 8. Device according to one of the preceding claims, characterized in that that at least some suction openings (12) of the vertically extending pipe legs (11a) have a regulating element (15) which changes its intake cross section.