DE879081C - Agitator with air supply - Google Patents

Description

Agitator with air supply The present invention relates to a Device for the distribution of air in liquids or the like, in particular for aeration of wort in the yeast industry or for other applications.

For aeration of fermentation liquids it is known to use air distribution devices, Their air outlet surfaces made of ceramic masses, pressed clay, stoneware. sintered Glass and the like are formed to be pressed into the fermentation liquid. With these well-known Devices, less air is required than with other known devices, in the case of tubular air distribution systems resting at the bottom of the fermentation vessels where a stirrer is moved horizontally if necessary. are arranged. at However, the known ceramic masses and the like are due to their low permeability a fairly high operating pressure and the associated considerable effort required, which cancels out the air savings achieved to a large extent. aside from that with such masses is the indispensable permanent one to avoid infections Keeping clean is very difficult (patent specification 682 136).

When introducing the air in the form of the finest air bubbles, precautions had to be taken taken to keep the air supplied evenly throughout the fermentation vat to distribute. In one of these known methods, the digestate is by means of a Turbine od. The like. Sucked in in the upper part of the fermentation vat, with the supply of air through a wide pipe or the like. In the tub pressed down and at the lower end of the pipe through a second turhine od; like; sucked in and outside of the pipe up again (patent specification 743 984). The foam formation leaves Do not avoid each other with this ventilation, so that the application of special foam-absorbing Means is necessary to keep the foam formation within tolerable limits.

Another method of aerating foaming fermentation fluids is made by a cylinder jacket arranged centrally in the fermentation vessel with a floor clearance Fermentation liquid divided into an outer and an inner zone in the outer ring zone ventilated and the rising foam over the cylinder jacket made to overflow, venting taking place in the inner zone. It gets through this accordingly Guided aeration and ventilation without the use of foam-suppressing agents an air-liquid emulsion formed the same during the whole continuous fermentation process Liter weight retains (patents 759121 and 744678).

The invention has the task of working without compressed air ì To create a ventilation device for fermentation vessels, namely this ventilation device mainly for the cultivation of baker's yeast, especially IS partial yeast for laboratory purposes, be thought. But industrial recycling is also conceivable.

The new air distributor according to the invention consists of a rotating one offset air delivery pipe with air above the fermentation vessel into the eye openings, which are limited by suitable air screens or air wings, while in one certain distance from the ground in a flared part which goes into the air tube sucked air escapes into the fermentation vessel. The air can go down centrally, at best divided into individual streams, directed to the bottom of the fermentation vessel, from where, with simultaneous rotation of the pipe by impact, a lateral discharge and uniform distribution in the fermentation liquid takes place. A washer at the end of the pipe without a conical expansion is sufficient to circulate the fermentation liquid, while at the same time a very extensive enforcement of the same takes place with the sucked in air. A pipe insert which is known per se and is open from above and below and surrounding the agitator favors these processes. In addition to the air that is inevitably introduced, there is also still-sucked in suction air generated by the-toín agitator at the upper liquid level.

If necessary, air outlets with appropriate bracket or Umbrella-like limits on the lower conical pipe socket possible, whereby the Air intake is increased significantly. In any case, it must be ensured that the total width of the air outlets is greater than the air inlet cross-section.

Such an air-fed agitator works extremely cheaply and if the air is sufficiently distributed within the fermentation vat, depending on the speed of rotation of the agitator, a change in the amount of air introduced within wide limits. For laboratory purposes, for special cases when the Air ducts the agitator can only be used to circulate the contents of the fermentation tank.

The new air supply allows a larger air supply for baker's yeast cultivation Sugar concentration in the liquid to be stuck without affecting the Yeast. It can therefore be more sugar solutions, z. B. in the form of sulphite liquors, molasses, etc., process, so that one, converted on one unit, more yeast gets.

If molasses is fermented, it can be used without affecting the yield and driving force of the run with a higher concentration of sugar in the molasses work while still gaining considerable amounts of alcohol., This species the molasses yeast is off for the yeast cultivation in the baker's yeast production Sulphite waste liquor is therefore of particular interest, since a profit in alcohol increases the yeast price reduced.

The drawing illustrates an example embodiment of the subject matter of the invention, namely Fig. I shows a schematic longitudinal section, Fig. 2 is a cross-section of the air intake openings, Fig. 3 is a partial view of a Another embodiment of an air distributor, Fig. 4 a cross section I-I of Fig. 3, Fig. 5 a further embodiment.

The air distributor consists of one with a motor I or one other drive source in the direction of arrow 2 in rotation offset tube 3, which is inserted into a fermentation vessel 4.

The air is sucked in through slots 5. These are as shown in Fig. I. limited outside by wing-like approaches 6, which above to create additional Air vents can be open (arrows 7) and also in the direction of rotation of the Tube 3 are so slightly curved inward that the air is effectively sucked in will. If necessary, the inlet cross-sections 5 according to Fig. I change the height by adjusting the wing 6.

According to Fig. 3 and 4, narrowed from the outside in and the Air inlet slots 5 on all sides in the form of half a cone, half a pyramilde or a> spherical sector surface roofing air ducts 6a are provided, which act as air screens, in their openings when turned in the direction of the arrow 2 larger amounts of air are captured and pressed in. A fixed one, with a Air intake pipe 12 verse flat ring extension 13 favors this air intake and allows the suction of sterilized air. The louvers 5 can in turn in their Size, especially its length, can be adjusted. At the lower end of the air tube is a conically downwardly widened end piece 8 with a bottom open at the bottom, best exchangeable, used. This central air outlet cone can be below be open or partially closed or covered by a sieve plate. If necessary, this enlarged lower air outlet propeller-like blades to form radially extending air slots or other suitable air ducts must be used. If a lower bearing of the air distribution pipe, z. B. for large fermentation vats, you can in the middle of the radial air outlet guides or a simple star-shaped bar insert place the lower bearing pin.

In a preferred embodiment of the outlet cone in Close to the floor and additional air outlets after the beginning of the expansion 9, especially above and below, to be provided. These air outlets are through opposite to the direction of rotation bent air blades 10 (Fig. I) or by roof-shaped, outwardly expanding air ducts 10a (Fig. 3), which as well as the inlet screens 6a are shaped to form outlet screens 10a.

A lower air circulation is achieved by replacing the outlet cone 8 through a disc. in which there is a centrally downward directed air outlet - is located. If an introduction of air through the pipe 3 is not desired, the can lower cone extension 8 by a pipe closure sleeve with air circulation disk any Shaping to be replaced. In this version, the upper air inlets come 5 does not have an effect, since there is an air flow due to the lack of a lower air outlet in pipe 3 does not take place.

The agitator can be located within an optionally with longitudinal slots provided pipe insert II, which the circulation of the fermentation bulk contents and foam destruction favored. The air directions are indicated by arrows.

The way this agitator works is as follows.

Without an additional air pump, the air is drawn from the outside of the fermentation vat well distributed by the agitator of the fermentation liquid, without the foam, C 02 or fermentation gases from the fermentation vat are carried away by the fresh air, d. H. the air inlets must be high enough. Through the lower conical agitator part In connection with the fine air distribution, it becomes an air-liquid emulsion formed, which penetrates outside of the pipe insert 1 1 upwards and inside this insert II is rolled down.

The introduction of air is through that between the air outlet screens or wings and the circulated liquid resulting vacuum and by crowding of the air inside the inlet screens causes the inlet wing, so that the air in Depending on the speed of the air tube under a certain pressure in the hollow shaft flows in.

The outlet cone flings the air in fine distribution up to Büttenwand and ensures that the yeast and other sediments are whirled up.

A disc with a central opening attached in place of the cone 8 does not suck in the air, but it is pressed in from the upper inlet screens. The amount of air that is in the fermentation liquid is about twice as large than with an agitator with a closed air tube, and opposite this is the The amount of air conveyed by the cone is about four times greater.

Among the numerous embodiments he also has an agitator as advantageous in which the lower large diameter of the cone 8 is a Another cone 14 connects with air outlet screens IOa, which of course can also be designed as a wing IO according to Fig. I. The top 15 of the lower Cone 14 can be used as a lower bearing (Fig. 5).

The novel air distributor is not just for introducing air and fine distribution of the same for baker's yeast production or yeast breeding with simultaneous Can be used to produce alcohol, but also in general as a simple mixer stirrer for liquids, emulsions or the like of any type and consistency or any other Areas of application in which air, gases or, under certain circumstances, liquids to be introduced into other media and finely distributed.

For example, the air distributor is suitable for sugar factories as Saturator for introducing CO, or as a sulfitator for introducing SO ,.

The air distributor can also be used in the fat and soap industry z. B. use to introduce liquid fats and their distribution, as well for denaturing alcohol or for introducing additives into fuels.

Claims (5)

P A T E N T A N S P R Ü C H E: 1. Agitator with air or gas supply Od. Like., characterized in that a in a known manner in rotation relocatable pipe above the fermentation liquid air inlet openings with the air intake favoring wing or umbrella-like approaches and located at the bottom At the end of the air pipe close to the bottom of the fermentation tank, air outlets of the same size located that their cross-section is larger than the total cross-section of the air intake openings. 2. Agitator according to claim I, characterized in that on one lower, conically widened, possibly additionally guided at the bottom pipe socket In addition to air outlet openings opening down centrally, additional air outlets provided with blades or air outlet screens bent in the opposite direction to the direction of rotation are. 3. Agitator according to claim I and 2, characterized in that another, conically tapering downwardly tapering pipe socket, which also has air outlet openings is equipped and can optionally be used for lower storage. 4. Agitator according to claim I and 2, characterized in that the flared and possibly narrowed down again Pipe socket arranged interchangeably and either by a disk or the like. With lower central air outlet or a disc closed at the bottom is replaceable. 5. Agitator according to claim I, characterized in that the air inlets are located within a fixed ring jacket on which there is a Air supply pipe closes.