SU1386651A1 - Apparatus for thickening suspensions - Google Patents

Abstract

The invention relates to apparatus for thickening a suspension. The purpose of the invention is to increase the degree of thickening of the suspension. The device contains a vertical case I with connections 2 -. 6 partitions 7 and 8, three chambers 9, 10 and 11, perforated pipes 12 with filter 5 with the aid of material 13. The upper ends of the pipes 12 are placed in the openings 14 of the partitions 8 and plugged at the ends, and the lower open ones are placed in the chamber 10. In addition, the apparatus equipped with a slurry recirculation system consisting of two tanks 15 and 16 connected by pipelines 17, 20, 23, 24 with valves 18, 19, 21, 22, 25, 26 to the middle chamber 11 and the upper chamber 9. Capacities 15 and 16 contain nozzles 27, 28 with valves 29, 30 for air outlet, and nozzle 4 is equipped with a valve 31. The proposed apparatus allows thicken the suspension at low energy costs and achieve high performance. 2 hp f-ly, 2 ill. I (L

Description

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The invention relates to an apparatus for thickening suspensions, preferably yeast.

The purpose of the invention is to increase the concentration of the slurry.

Figure 1 shows an apparatus for thickening a suspension, a longitudinal section; figure 2 - node I in figure 1.

Apparatus for thickening a suspension of suction to where under its own weight

and a greater tangential stress, leading to an increase in pressure at the gas-liquid-gas interface, which provides an increase in the degree of thickening of the suspension.

The device works as follows.

Suspension (for example, yeast) through the pipe 2 enters the chamber 9, from

holds a vertical housing 1 with connections for supplying slurry 2, for supplying 3 and discharging 4 air, for discharging thickened slurry 5 and for discharging filtered liquid 6, divided by horizontal partitions 7 and 8 into three chambers, the top 9 of which are designed to collect condensed slurry and bottom 10 -. for collecting the filtered liquid, and perforated pipes vertically arranged in the middle chamber 11

12c with a filtering material 13 fixed thereto,

The upper ends of the perforated pipes 12 are plugged at the ends and placed in the openings 14 of the upper partition 8 to form a gap for the passage of the suspension, and the lower open ends of the pipes 12 are placed in the chamber 10 for collecting the filtered liquid. The apparatus is equipped with a slurry recirculation system consisting of two tanks 15 and 16 for collecting the partially condensed slurry installed above the housing 1, connected via pipe 17 with valves 18 and 19 to the bottom of the middle chamber 11 and pipe 20 with valves 21 and 22 to the upper part of the middle chamber 11, as well as pipelines 23 and 24 with valves 25 and 26 to the upper chamber 9. The tanks 15 and 16 have in their upper part the pipes 27 and 28 with valves 29 and 30 for air outlet, and the pipe 4 for exhaust air is provided with a valve 31.

In addition, the filter material

13 on the perforated pipes 12 are fastened with spiral-wound wire 32, with a ratio of the distance (S) between two adjacent turns to the diameter (d) of the wire 32, equal to 8 to 12, the nozzle 3 for supplying air is installed tangentially to the body 1 of the apparatus.

The choice of the ratio of S to d, equal to 8–12, is due to the fact that in this range of values

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flows through the gap of the holes 14 in the upper partition B, having formed in the form of a ring, flows onto the outer surface of the filter material 13 on the perforated pipes 12 and moves as a continuous layer downwards.

Air under pressure is supplied to the middle chamber 11 through the pipe 3, while the pressure inside the chamber 11 is regulated (established) by a valve 31 on the pipe 4 for exhausting air.

Due to the air pressure, as well as the tangential stresses generated by the fluid moving over the surface of the pipes 12, the suspension thickens in the liquid: the liquid through the pores of the filtering material 13 and the perforations in the pipes 12 enters the inside of the pipes 12, and from there to and through the pipe 6 out of the apparatus. Leaving a condensed suspension, having passed in the form of a liquid layer on the outer surface of the pipes 12, flows into the lower part of the chamber) 1. Then the condensed suspension under the action of gas pressure enters the pipeline 17, and from there in the tank 15 and 16, which are filled and emptied alternately, and again moves from the chamber 9 along the surface of the pipes 12 downwards.

When the container 15 is filled, valves 25 and 21 simultaneously clog and valves 29 and 18 open, which creates a pressure in the tank 15 equal to the atmospheric pressure, and thus the liquid itself through the pipeline 17 enters the container 15.

Similarly, when the container 16 is filled, valves 26 and 22 simultaneously clog, and valves 30 and 19 open. After filling the tank 16, it is emptied.

When emptying the container 15, the valves 29 and 18 are closed (which prevents liquid from flowing from the lower part of the chamber 11), while simultaneously opening the valve 25 (which allows the fluid to drain into the chamber 9) and the valve 21 (which equalizes the pressure in the container I5 and in the annular space cameras 11).

When emptying the container 16, valves 30 and 19 are similarly closed, and valves 26 and 22 are opened.

The condensed liquid entering the chamber 9 again moves in the form of a continuous movable layer along the surface of the pipes 12. The concentrated mass is withdrawn through the nozzle 5.

Thus, in the proposed apparatus, a high degree of concentration of the suspension is achieved due to the creation of recirculation of a condensable medium and an increase in the specific productivity while maintaining the cost of energy in comparison with the known.

In the case of yeast thickening, this unit provides an intensive release of yeast from a suspension with a high concentration of dry substances, which simplifies their further processing and reduces the cost of the final product.

Claims (3)

1. An apparatus for thickening a suspension of predominantly yeast, containing a vertical body with process connections, divided by horizontal partitions into three chambers 0 five 0 five 0 five the upper part of which is designed to collect a condensable suspension, and the lower one to collect a filtered liquid, and perforated pipes vertically arranged in the middle chamber with a filtering material attached to them, characterized in that, in order to increase the degree of thickening of the suspension, the upper ends of the perforated pipes are plugged from the ends and placed in the openings of the upper partition with the formation of a gap for the passage of the suspension, and the lower open ends are placed in the chamber for collecting the filtered liquid, while the apparatus provides ene slurry recirculation system consisting of two tanks for collecting partially thickened suspension, installed above the housing are connected by means of pipelines with valves to the upper and lower portions of the middle chamber and the upper chamber to collect the suspension thickens. 2. The pop-1 apparatus, differing from that with the fact that the filtering material on perforated pipes is fixed by a wire wound in a spiral, with a ratio of the distance between two adjacent turns to the diameter of the wire, equal to 8-12. 3. A pop-1 apparatus, characterized in that the air inlet is installed tangentially to the body of the apparatus.