GB2030884A

GB2030884A - Settling apparatus

Info

Publication number: GB2030884A
Application number: GB7839675A
Authority: GB
Original assignee: CHLADICI TECHNIKY; USTAV POTRAVINARSKE; VUEPCHT VYZKUMNY
Current assignee: CHLADICI TECHNIKY; USTAV POTRAVINARSKE; VUEPCHT VYZKUMNY
Priority date: 1978-09-28
Filing date: 1978-10-06
Publication date: 1980-04-16
Also published as: CH632675A5; DE2842975A1

Abstract

Apparatus for the separation of liquid-liquid and/or liquid-solid mixtures, especially sugar-containing suspensions, consists of a vessel 1 fitted at its upper end with a plurality of plane, parallel, inclined plates 2 forming separation passages, a mixture distributor 3 at one end of the passages, an outlet 4 for purified liquid at the other end of the passages, inside the vessel below and/or above the plates 2 and extending transversely thereto a plurality of planar or curved guide blades 6, and an outlet at the top of the vessel for separated liquid and/or an outlet 5 at the bottom of the vessel for the discharge of the separated solid. For the separation of the liquid from the solid phase the guide blades 6 are arranged below the plates 2, while for the separation of two liquids from each other the guide blades 6 are arranged above the plates 2. In the case of a three-component separation, guide blades 6 are arranged both above and below the plates 2. <IMAGE>

Description

SPECIFICATION Apparatus for the separation of liquid mixtures, especially sugar-containing suspensions.

This invention relates to apparatus for the separation of liquid mixtures, that is, liquiform mixtures, especially suspensions produced in the sugar industry.

The known apparatuses for the separation of liquid mixtures, especially sugar-containing suspensions, consist of a vessel of oblong or circular cross-section, which is connected up at its lower end to a pipe of smaller cross-section than the vessel. The pipe forms with the vessel communicating vessels and has its longitudinal axis at an acute angle. In the vessel a bundle of plates is placed, which is wholly immersed in the suspension to be separated. This type of equipment is described in German patent No.

1,253.674.

The suspension subjected to the separation flows at first through the tube of a smaller crosssection downwards, then it turns and passes upwards through the bundle of plates where the main separation takes place. The separated solid phase passes against the stream of entering suspension along the plates, where it impinges upon the entering suspension. This results in mixing and incomplete separation. The suppression of this undesirable result may be effected by apparatus of larger volume, but not even in that case can the slight turbidity be fully removed.

The above disadvantage has been removed by apparatus for the separation of liquid mixtures, especially sugar-containing suspensions, according to the present invention, said apparatus comprising a vessel, a set of spaced separating plates forming in the vessel a set of laterally sloped interplate separation passages extending from front to rear of the vessel for longitudinal through flow of mixture, and a plurality of.spaced guide plates in the vessel adjacent to the separation plates and extending from side to side of the vessel to direct mixture into the separation passages, said vessel having an inlet for mixture at one end of the separation passages and outlet for purified liquid at the other end of the separation passages and having outlet means for discharge of the separated material.

A preferred construction consists of an invertedconical or inverted-pyramidal vessel fitted at the flared upper end portion with a system of planeparallel oblique plates, a suspension distributor and a collectorforthe pure fraction, and fitted at its lower end portion with a mud-discharging device; inside the vessel, below or above the system of plane-parallel oblique plates or on each side of the system of plane-parallel oblique plates there are mounted transversely, say perpendicularly, to the direction of the flow of medium two to fifty directing blades shaped to present a planarorcurved surface.For the separation of the liquid and the solid phases the directing blades are arranged below the separation zone, while for the separation of two liquids they are above the separation zone; in the case of three-component separation they are in combination, that is, both above and below the separation system.

Through location of the system of plane-parallel plates in the upper end portion of the vessel, a cross-stream of the entering suspension occurs in regard to the just-separated solid phase, which results in the sharp separation of the solid phase with the exclusion of the turbidity and with the ability to use apparatus of a volume 300 pot smaller than the volume of comparable apparatus.

The main effect consists in that the magnitude of the hydraulic resistance in the mixture flow on the directing blades exceeds the hydraulic resistance value on the bundle of separation plates so that the mixture fed is made to flow mainly through the spaces of the bundle of separating plates and thus to make full use of their surface. In this way the separation can be increased by at least 1 Opct, with otherwise identical apparatus volume.

The actual construction of the apparatus of this invention can vary considerably, but to enable the nature of the invention to be fully appreciated an embodiment will now be described with reference to the accompanying drawings; let it be clear, however, that the invention need not necessarily be limited to this embodiment.

In the drawings: Fig. 1 is a front view of the improved apparatus for the separation of liquid mixtures, more specifically sugar-containing suspensions.

Fig. 2 is a sectional view of the apparatus on the plane A-A of Fig. 1.

Referring to the drawings:~ The apparatus for the separation of liquid mixtures, especially sugar-containing suspensions, consists of a vessel 1 of inverted-conical or inverted-pyramidal shape fitted at the flared upper end portion with a system of plane-parallel oblique plates 2, a suspension distributor 3 and a collector 4 of pure fraction, and fitted at the tapered lower end portion with a mud-discharging device 5. In the vessel are fitted two systems each of seven directing or guide blades 6 of a shape to present planar surfaces, the systems being arranged one at each side of the separating system of planeparallel oblique plates 2.

The mixture is introduced through the mixture distributor 3 into the system of plane-parallel plates 2, and is continuously directed by blades 6 towards the separation spaces 2 where the separation of two different liquid phases and the solid phase takes place. The two liquid phases flow respectively into two channels of the collector 4, while the solid phase is collected in the bottom portion of the vessel 1, whence it is removed via the mud-discharging device 5.

1. Apparatus for separating liquid mixtures, especially sugar-containing suspensions, comprising a vessel, a set of spaced separating

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Apparatus for the separation of liquid mixtures, especially sugar-containing suspensions. This invention relates to apparatus for the separation of liquid mixtures, that is, liquiform mixtures, especially suspensions produced in the sugar industry. The known apparatuses for the separation of liquid mixtures, especially sugar-containing suspensions, consist of a vessel of oblong or circular cross-section, which is connected up at its lower end to a pipe of smaller cross-section than the vessel. The pipe forms with the vessel communicating vessels and has its longitudinal axis at an acute angle. In the vessel a bundle of plates is placed, which is wholly immersed in the suspension to be separated. This type of equipment is described in German patent No. 1,253.674. The suspension subjected to the separation flows at first through the tube of a smaller crosssection downwards, then it turns and passes upwards through the bundle of plates where the main separation takes place. The separated solid phase passes against the stream of entering suspension along the plates, where it impinges upon the entering suspension. This results in mixing and incomplete separation. The suppression of this undesirable result may be effected by apparatus of larger volume, but not even in that case can the slight turbidity be fully removed. The above disadvantage has been removed by apparatus for the separation of liquid mixtures, especially sugar-containing suspensions, according to the present invention, said apparatus comprising a vessel, a set of spaced separating plates forming in the vessel a set of laterally sloped interplate separation passages extending from front to rear of the vessel for longitudinal through flow of mixture, and a plurality of.spaced guide plates in the vessel adjacent to the separation plates and extending from side to side of the vessel to direct mixture into the separation passages, said vessel having an inlet for mixture at one end of the separation passages and outlet for purified liquid at the other end of the separation passages and having outlet means for discharge of the separated material. A preferred construction consists of an invertedconical or inverted-pyramidal vessel fitted at the flared upper end portion with a system of planeparallel oblique plates, a suspension distributor and a collectorforthe pure fraction, and fitted at its lower end portion with a mud-discharging device; inside the vessel, below or above the system of plane-parallel oblique plates or on each side of the system of plane-parallel oblique plates there are mounted transversely, say perpendicularly, to the direction of the flow of medium two to fifty directing blades shaped to present a planarorcurved surface.For the separation of the liquid and the solid phases the directing blades are arranged below the separation zone, while for the separation of two liquids they are above the separation zone; in the case of three-component separation they are in combination, that is, both above and below the separation system. Through location of the system of plane-parallel plates in the upper end portion of the vessel, a cross-stream of the entering suspension occurs in regard to the just-separated solid phase, which results in the sharp separation of the solid phase with the exclusion of the turbidity and with the ability to use apparatus of a volume 300 pot smaller than the volume of comparable apparatus. The main effect consists in that the magnitude of the hydraulic resistance in the mixture flow on the directing blades exceeds the hydraulic resistance value on the bundle of separation plates so that the mixture fed is made to flow mainly through the spaces of the bundle of separating plates and thus to make full use of their surface. In this way the separation can be increased by at least 1 Opct, with otherwise identical apparatus volume. The actual construction of the apparatus of this invention can vary considerably, but to enable the nature of the invention to be fully appreciated an embodiment will now be described with reference to the accompanying drawings; let it be clear, however, that the invention need not necessarily be limited to this embodiment. In the drawings: Fig. 1 is a front view of the improved apparatus for the separation of liquid mixtures, more specifically sugar-containing suspensions. Fig. 2 is a sectional view of the apparatus on the plane A-A of Fig. 1. Referring to the drawings:~ The apparatus for the separation of liquid mixtures, especially sugar-containing suspensions, consists of a vessel 1 of inverted-conical or inverted-pyramidal shape fitted at the flared upper end portion with a system of plane-parallel oblique plates 2, a suspension distributor 3 and a collector 4 of pure fraction, and fitted at the tapered lower end portion with a mud-discharging device 5. In the vessel are fitted two systems each of seven directing or guide blades 6 of a shape to present planar surfaces, the systems being arranged one at each side of the separating system of planeparallel oblique plates 2. The mixture is introduced through the mixture distributor 3 into the system of plane-parallel plates 2, and is continuously directed by blades 6 towards the separation spaces 2 where the separation of two different liquid phases and the solid phase takes place. The two liquid phases flow respectively into two channels of the collector 4, while the solid phase is collected in the bottom portion of the vessel 1, whence it is removed via the mud-discharging device 5. CLAIMS

1. Apparatus for separating liquid mixtures, especially sugar-containing suspensions, comprising a vessel, a set of spaced separating plates forming in the vessel a set of laterally sloped interplane separation passages extending from front to rear of the vessel for longitudinal throughflow of mixture, and a plurality of spaced guide plates in the vessel adjacent to the separation plates and extending from side to side of the vessel to direct mixture into the separation passages, said vessel having an inlet for mixture at one end of the separation passages and outlet for purified liquid at the other end of the separation passages and having outlet means for discharge of the separated material.

2. Apparatus according to claim 1, wherein the guide plates are disposed above the separating plates and an outlet for separated liquid is disposed at the top of the vessel so that a liquid impurity in the mixture is separated and discharged.

3. Apparatus according to claim 1 or2, wherein guide plates are disposed below the separating plates and an outlet for separated solids is disposed at the bottom of the vessel so that a solid impurity in the mixture is separated and discharged.

4. Apparatus according to claim 3, wherein the separating plates and the associated guide plates are located in an upper portion of the vessel whereof the lower portion has downwardly convergent walls and the solids outlet is at the bottom of the lower portion.

5. Apparatus according to any one of the preceding claims, wherein the vessel is of generally inverted-concical shape.

6. Apparatus for separating liquid mixtures, especially sugar-containing suspensions, substantially as hereinbefore described with reference to the accompanying drawing.