Device and method for mixing the contents of a tank

Abstract

Device 1 for mixing the contents of a tank 10 comprising a first pipe connecting body 20 arranged on a connecting flange 14 of a tank 10; a riser pipe 40 extending through the first pipe connecting body 20 into the tank; a mixing pipe 50 extending through said first pipe connecting body 20 into said tank; and a pump 60 whose outlet 64 can be connected at least to the mixing pipe 50 and whose inlet 62 can be connected both to the first pipe connecting body 20 and to the riser pipe 40. Further a method for mixing the contents of a tank is claimed.

Claims

1. A device for mixing the contents of a tank comprising a. a first pipe connecting body arranged on a connecting flange of a tank; b. a riser pipe extending through the first pipe connecting body into the tank; c. a mixing pipe extending through said first pipe connecting body into said tank; d. a pump whose outlet is connected at least to the mixing pipe and whose inlet is connected both to the first pipe connecting body and to the riser pipe; and e. a deflection plate secured to the riser pipe above the first pipe connecting body; wherein the deflection plate is located at a bottom of the tank and below an upper end of the riser pipe.

2. The device according to claim 1, wherein the outlet of the pump is also connectable to the first pipe connecting body when the inlet of the pump is connected to the riser pipe.

3. The device according to claim 1, wherein the outlet of the pump is also connectable to the riser pipe when the inlet of the pump is connected to the first pipe connecting body.

4. The device according to claim 1, wherein the mixing pipe runs inside the riser pipe, preferably concentrically inside the riser pipe.

5. The device according to claim 1, wherein the riser pipe extends substantially vertically upward into the tank and/or has an open end.

6. The device according to claim 1, wherein the mixing pipe is further usable for withdrawing tank contents.

7. The device according to claim 1, wherein a mixing nozzle is located inside the tank and connected to the upper end of the mixing pipe.

8. The device according to claim 7, wherein the mixing nozzle is a jet pump adapted to withdraw tank contents from the tank and mix it with tank contents pumped via the mixing pipe to the mixing nozzle.

9. The device according to claim 1, wherein the lower end of the riser pipe is connected to a second pipe connecting body.

10. The device according to claim 1 wherein the riser pipe is shorter than the mixing pipe.

Description

4. SHORT DESCRIPTION OF THE DRAWINGS

(1) In the following preferred embodiments of the invention are described with reference to the drawings, wherein:

(2) FIG. 1: shows a sectional side view of a lower portion of a cylindroconical tank having an embodiment of a device for mixing the tank contents and a schematic representation of further components of the device in an operating mode for mixing the tank contents;

(3) FIG. 2: shows the device according to FIG. 1 in another operating mode during mixing the tank contents;

(4) FIG. 3: shows the device according to FIG. 1 in another operating mode during diluting or whirling up sediment;

(5) FIG. 4: shows a three-dimensional partial view of a lower region of a cylindroconical tank having an embodiment of a device for mixing the contents of the tank; and

(6) FIG. 5: shows a cut side view of the lower part of the tank of FIG. 4, with parts of the device for mixing the tank contents in detail.

5. DESCRIPTION OF PREFERRED EMBODIMENTS

(7) In the following, preferred embodiments of the invention are described in detail with reference to the drawings.

(8) FIG. 1 shows a lower part of a cylindroconical tank (CCT) 10 as used, for example, as a fermentation and/or storage tank of a brewery with a device 1 for mixing tank contents. At the lower conical outlet area of the tank 10 a connection flange 14 is located to which a first pipe connecting body 20 is connected. The tank 10 can be filled and emptied via a main pipe 90 which is connected to the tank 10 at this first pipe connecting body 20. The connection flange 14 preferably has a nominal diameter DN of 100 mm or larger.

(9) As further parts of the device 1, a riser pipe 40 extends through the connecting flange 14 into the tank 10. The riser pipe 40 is essentially aligned vertically and penetrates the opening of the connection flange 14 preferably coaxially. The nominal diameter DN of the riser pipe is preferably 65 mm. Via the riser pipe 40, the tank contents can be withdrawn from tank 10 at a certain height or introduced into tank 10. At the lower end of the riser pipe 40, it is connected to a second pipe connecting body 30, which hydraulically connects the riser pipe 40 to the other parts of device 1.

(10) In addition, a mixing pipe 50 extends through the connection flange 14 into the tank. The mixing pipe 50 runs essentially coaxially inside the riser pipe 40 and is also vertically aligned. The upper end of the mixing pipe 50 can be open, or a mixing nozzle 52 can be connected to it. The mixing nozzle 52 is preferably a jet pump 52, which itself can suck the contents of the tank from tank 10 and mix them with the propellant, which is fed to it through the mixing pipe 50. If no mixing nozzle 52 is installed on the mixing pipe 50, the mixing pipe 50 can also be used to suck in tank contents.

(11) The device 1 further comprises a pump 60 which can be connected in different ways to the first pipe connecting body 20, to the riser pipe 40 and to the mixing pipe 50 by means of piping 92 and valves 71-80. Due to the different interconnection options, different operating states of the device for mixing, sedimentation and cleaning (Cleaning In Place, CIP) can be set.

(12) For filling or emptying the tank without simultaneous mixing, valve 71 is open and all other valves are closed.

(13) To mix the tank contents in a first operating mode, as shown in FIG. 1, the valves 73, 76 and 77 are open and the other valves are closed. The inlet 62 of the pump 60 is thus connected to the riser pipe 40 via the second pipe connecting body 30. The outlet 64 of the pump 60 is connected to the lower end of the mixing pipe 50. Thus the tank content is withdrawn via the riser pipe 40 and fed to the pump 60. The pump 60 is in operation and pumps the withdrawn tank contents to the mixing pipe 50, which introduces the tank contents at a raised position into the tank 10 and thus ensures mixing of the tank contents. Depending on the power of the pump 60, partial sedimentation can also be achieved in the area below the upper end 42 of the riser pipe 40. The power of the pump 60 can be controlled by a speed control 83 of the pump 60.

(14) The mixing of the first operating mode can also be carried out during the discharge of tank contents from tank 10. In this case the pump 60 is in operation and the valves 71, 73, 76 and 77 are open and the other valves are closed. This ensures a homogeneous distribution of suspended particles in the liquid even during discharge. This operating mode can also be carried out when filling the tank in order to mix the tank contents during filling.

(15) In another operating mode shown in FIG. 2, valves 72 and 77 are open, the other valves are closed and the pump is in operation. Thus, the inlet 62 of pump 60 is connected to the first pipe connecting body 20 and the outlet 64 of pump 60 is connected to the mixing pipe 50. In this operating mode, the tank contents are therefore withdrawn at the lowest point of tank 10 and fed back to the tank via mixing pipe 50 or a mixing nozzle 52 connected to it. This results in optimum mixing of the entire tank contents of the tank 10.

(16) In another operating mode shown in FIG. 3 the valves 73, 75 and 76 are open, the other valves are closed and the pump 60 is in operation. The inlet 62 of pump 60 is thus connected to riser pipe 40 and the outlet 64 of pump 60 is connected to the first pipe connecting body 20. In this mode, sediment deposited in the lower part of tank 10 can be whirled up or diluted so that it can subsequently be better removed from tank 10 or remixed with the tank contents. To improve the turbulence of the sediment, a deflection plate 70 is attached to the riser pipe 40 just above the first pipe connecting body 20. This swirls the flow of tank contents coming from the pipe connecting body 20 so that the sediment is better captured.

(17) In another operating mode (not shown) the valves 72, 76 and 79 are open, the other valves are closed and the pump 60 is in operation. Thus, the inlet 62 of pump 60 is connected to the first pipe connecting body 20 and the outlet 64 of pump 60 is connected to the riser pipe 40. In this operating mode, the withdrawn tank contents are introduced via the riser pipe 40 and thus at a lower level than via the mixing pipe 50 or the mixing nozzle 52. In this operating mode, mixing can therefore be carried out more gently than via the mixing nozzle 52. This operating mode can also be used for a cooling process, for example, since large mass flows are required therefore.

(18) These mass flows may no longer be conveyed through the mixing pipe 50 but must be introduced into the tank via the riser pipe 40. A necessary heat exchanger (not shown) is then variably integrated into any pipe outside the tank. One conceivable location, for example, would be between pump 60 and valve 79.

(19) Altogether, the inventive device 1 can be used to connect the most varied operating modes, so that device 1 can be used for the most varied mixing and sedimentation applications, particularly in the beverage and food industries. Device 1 or the process carried out with it can preferably be used in the different operating modes for dry hopping in a beer brewing process.

(20) The device is also suitable for Cleaning In Place (CIP). For CIP of mixing pipe 50 and mixing nozzle 52, valves 72, 73, 74 and 77 are open and the other valves are closed. Pump 60 is in operation at CIP.

(21) For CIP the riser pipe 40, valves 72, 76 and 79 are open, the other valves are closed and the pump 60 is in operation.

(22) For CIP of valve 75, valves 72, 73, 74 and 75 are open, the other valves are closed and pump 60 is in operation.

(23) To drain the CIP liquid from device 1 and from tank 10, all valves 71-80 are open and pump 60 is not operating.

(24) Device 1 also has measuring instruments 81, 82 and 84, such as volume and/or mass flowmeters, temperature meters, pH meters, pressure gauges, turbidity and/or colorimeters or other measuring instruments for the beverage industry. The exact number and arrangement of measuring instruments is arbitrary.