GB2155604A - Method for the treatment of crystal sugar and apparatus for carrying out the method - Google Patents
Method for the treatment of crystal sugar and apparatus for carrying out the method Download PDFInfo
- Publication number
- GB2155604A GB2155604A GB08505460A GB8505460A GB2155604A GB 2155604 A GB2155604 A GB 2155604A GB 08505460 A GB08505460 A GB 08505460A GB 8505460 A GB8505460 A GB 8505460A GB 2155604 A GB2155604 A GB 2155604A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sugar
- fluid
- vibrofluid
- stabilizer
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 235000021551 crystal sugar Nutrition 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 16
- 235000000346 sugar Nutrition 0.000 claims abstract description 51
- 238000003860 storage Methods 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 23
- 239000003381 stabilizer Substances 0.000 claims description 19
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 238000005273 aeration Methods 0.000 description 3
- 238000012432 intermediate storage Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B40/00—Drying sugar
- C13B40/002—Drying sugar or syrup in bulk
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Treatment of crystal sugar, particularly prior to its storage in a high-capacity storage container, wherein moist crystal sugar is first dried in a fluid or vibrofluid layer by an air stream at a simultaneous partial removal of fine sugar particles, whereafter the sugar is aerated by heated air for at least one day, after which it is cooled in a fluid or vibrofluid layer to a storage temperature at a simultaneous removal of residual fine sugar particles. <IMAGE>
Description
SPECIFICATION
Method for the treatment of crystal sugar and apparatus for carrying out this method
The invention relates to a method for the treatment of crystal sugar, particularly prior to its storage in a high-capacity storage container, and to an apparatus for carrying out the method, particularly to prevent hardening of sugar in the course of its storage.
At present, the treatment of moist sugar after it leaves centrifuges is accomplished by different methods, and different arrangements are used for this purpose. If vertical rotational, drum-shaped, fluid and vibrofluid drying devices are used, the drying air is prior to its application heated to a temperature of 70"C and more, so that sugar which leaves the drying device has a high temperature. This method involves high costs of power both for drying and subsequent cooling of sugar prior to storing. The time of prevailing of sugar in slow-moving rotating vertical and drumshaped drying devices is of the order of tens of minutes so that these drying devices are large, take up too much space and require high investment costs.The long drying time does not solve the problem of removal of bonded moisture in order to safeguard storage of sugar in high-capacity storage devices. Drying devices for sugar are generally directly connected with a cooling device to a sigle unit so that sugar enters, after leaving the drying zone, directly the cooling zone. The sudden cooling of sugar causes the creation of a solid solution on the surface of the sugar crystals due to moisture not fully eliminated in the drying device. Due to the reduction of the temperature of sugar to the storage temperature, the process of release of bonded moisture is slowed down and takes place also in the course of storage.This causes agglomeration and hardening of sugar in high-capacity storage containers or in storage cars, storage wagons and bags so that it is necessary to aerate the sugar intensively in the high capacity storage device, leading to increased investment, power and other operation costs.
These problems occur even if an independent drying device, spatially separated from the cooling device is used.
It is an object of this invention to eliminate or at least to mitigate these mentioned drawbacks during the storage of crystal sugar.
According to this invention the moist crystal sugar is first dried for one to five minutes in a fluid or in a vibrofluid air layer such that the output temperature of the sugar is 35 to 60"C by passage of air at a speed of 0.4 to 2.5 m/s, whereby fine sugar particles of a maximum size of 0.1 to 0.4 mm are partly removed, whereafter the sugar is aerated by air and is maintained at a temperature of 35 to 60"C for one to five days, with a following cooling to a temperature of 20 to 30"C for up to 1 minute in a fluid or vibrofluid layer, whereby simultaneously fine sugar particles of a maximum size of 0.1 to 0.4 mm are removed.The apparatus for carrying out this method comprises a fluid or vibrofluid drying device, downstream of which a stabilizer is provided, followed by a fluid or vibrofluid aerating cooling device. Conveyors, intermediate storage devices, classifiers and balances can be advantageously introduced between the drying device and the stabilizer and between the stabilizer and the following cooling device.
The main advantage of the method and arrangement according to this invention is in the introduction of the stabilization between the drying and cooling stages. Thus a high speed of release of bonded moisture and stabilization of the surface of sugar crystals is obtained at a minimum power consumption in the course of stabilization of sugar in the stabilizer, while the released moisture is removed in the course of aeration by air. An advantage of the method according to this invention represent also heat conditions in the course of drying, whereby a temperature of the discharged sugar suitable for its stabilization is adjusted. Thus the power consumption for drying in the drying device and for the final cooling in the cooling device are reduced.The relatively short time intervals of presence of sugar in the drying device, in the stabilizer and in the cooler lead to a substantial reduction of space requirements of the arrangement and thus to a substantial reduction of investment costs. By the drying and cooling in a fluid or vibrofluid layer, namely in the cooling device and the fluid or vibrofluid drying device, the removal of unwelcome fine sugar particles is secured. The sugar treated according to this invention can be reliably stored in a high storage capacity storage device or in a silo without the need of aeration, which represents substantial savings of investment, power and other operation costs.
The invention and its operation are more clearly described with reference to an exemplary embodiment shown diagrammatically in the accompanying drawing, illustrating an apparatus for the treatment of crystal sugar according to this invention.
This arrangement comprises a fluid or vibrofluid drying device 1, followed by a stabilizer 2, downstream of which a fluid or vibrofluid aeration cooling device 3 is situated.
Conveyors, intermediate storage devices, classifiers and balances can be provided between the drying device 1 and the stabilizer 2 and the cooling device 3.
The moist sugar 4 enters the drying device 1 and after passage through the drying device 1, the dried sugar 5 passes to the stabilizer 2 wherefrom the stabilizer sugar 6 enters the cooling device 3, wherefrom the cooled sugar 7, rid of fine particles, passes for storage or filling into silowagons or siiocars or for bagging. Drying air 8 is supplied into the drying device 1 and the used air 9, which takes along fine sugar particles, leaves the drying device 1. Stabilizing air 10 is supplied to the stabilizer 2 and moist air 11 together with the released moisture leaves the stabilizer 2. Cooling air 12 is supplied to the cooling device 3 and the used air 13, which takes along fine sugar particles, leaves the cooling device 3.
The treatment of sugar according to this invention can be, for instance, accomplished such that the centrifuged moist sugar having a temperature of 60 to 70"C passes into a fluid drying device of an output of 1 5 tonnes per hour. The sugar is dried in a fluid layer by air preheated to 30"C at a Volume flow rate of 4 m3/s. The temperature of the sugar a the outlet from the drying device 1 is maintained at 40 to 50'C. The air from the drying device 1 takes along fine sugar particles of a maximum size of 0.2 mm which are retained by water in a foam separator. The sugar leaving the drying device 1 enters a classifier where it is classified to three fraction sizes.The middle fraction is designed for prolonged storage and passes by way of an intermediate storage device of a capacity of 1 5 tonnes over a system of belt conveyors to the stabilizer 2 having a capacity of 400 tonnes, the walls of which are heated to a temperature of 45"C.
The sugar in the stabilizer 3 is aerated by air at a flow rate of 1000 m3/h heated to 45"C.
The sugar is from the stabilizer 2 discharged once a day at an amount of 1 20 tonnes. Thus a stabilization time of 1 to 2.5 days is secured. The sugar passes from the stabilizer by way of an elevator to a cooling device in the shape of a fluid trough of an output of up to 25 tonnes per hour. The sugar is there cooled by air at a flow rate of 7 m3/s to a temperature of 254C in the course of 20 seconds. The discharged air simultaneously takes along fine sugar particles of the size of 0.25 + 0.05 mm which are caught by water in a foam separator. Sugar passes from the cooling device over a tilting balance by way of a conveyor system to a non-aerated concrete silo of a capacitor of
10000 tonnes for prolonged storage.
Claims (6)
1. Method for the treatment of crystal sugar, particularly prior to its storage in a high-capacity storage device, wherein the moist sugar is first dried for one to five minutes in a fluid or vibrofluid layer, such that the outlet temperature of the sugar is 35 to 60to, by the passage of air at a speed of 0.4 to 2.5 m/s in order to achieve a partial removal of fine sugar particles of a maximum particle size of 0.1 to 0.4 mm, whereafter the sugar is aerated by air and maintained at a temperature of 35 to 60"C for one to five days and is thereafter cooled for at the most one minute in a fluid or vibrofluid layer to a temperature of 20 to 30"C, while fine sugar particles of a maximum particle size of 0.1 to 0.4 mm are simultaneously removed by an air stream the speed of which is 0.4 to 2.5 m/s.
2. Method for the treatment of sugar substantially as herein described.
3. Apparatus for carrying out a method according to Claim 1, comprising a fluid or vibrofluid drying device with a stabilizer situated downstream thereof, and a fluid or vibrofluid aerated cooling device situated downstream of the stabilizer.
4. Apparatus according to Claim 3, wherein conveyors, classifiers and balances may be introduced between the drying device and the stabilizer and between the stabilizer and the cooling device.
5. Apparatus for the treatment of sugar constructed, arranged and adapted to operate substantially as described with reference to, and as shown in, the accompanying drawing.
6. Crystal sugar treated by a method according to Claim 1 or an apparatus according to Claim 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS158084A CS243738B1 (en) | 1984-03-05 | 1984-03-05 | Granulated sugar treatment method and equipment for application of this method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8505460D0 GB8505460D0 (en) | 1985-04-03 |
| GB2155604A true GB2155604A (en) | 1985-09-25 |
| GB2155604B GB2155604B (en) | 1987-09-30 |
Family
ID=5350523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08505460A Expired GB2155604B (en) | 1984-03-05 | 1985-03-04 | Method for the treatment of crystal sugar and apparatus for carrying out this method |
Country Status (5)
| Country | Link |
|---|---|
| CS (1) | CS243738B1 (en) |
| DE (1) | DE3506598A1 (en) |
| DK (1) | DK95385A (en) |
| GB (1) | GB2155604B (en) |
| PL (1) | PL142710B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410793A (en) * | 1972-09-14 | 1975-10-22 | Vyzk Ustav Chem Zarizeni | Process and device for the continuous drying of granular materials in a fluidized bed |
| GB1449372A (en) * | 1973-05-10 | 1976-09-15 | Anhydro As | Apparatus for the treatment of fluidized material |
-
1984
- 1984-03-05 CS CS158084A patent/CS243738B1/en unknown
-
1985
- 1985-02-25 DE DE19853506598 patent/DE3506598A1/en active Granted
- 1985-03-01 DK DK95385A patent/DK95385A/en not_active Application Discontinuation
- 1985-03-04 GB GB08505460A patent/GB2155604B/en not_active Expired
- 1985-03-05 PL PL25225085A patent/PL142710B2/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410793A (en) * | 1972-09-14 | 1975-10-22 | Vyzk Ustav Chem Zarizeni | Process and device for the continuous drying of granular materials in a fluidized bed |
| GB1449372A (en) * | 1973-05-10 | 1976-09-15 | Anhydro As | Apparatus for the treatment of fluidized material |
Also Published As
| Publication number | Publication date |
|---|---|
| CS243738B1 (en) | 1986-06-12 |
| DK95385D0 (en) | 1985-03-01 |
| DE3506598A1 (en) | 1985-09-05 |
| PL252250A2 (en) | 1985-11-19 |
| GB8505460D0 (en) | 1985-04-03 |
| GB2155604B (en) | 1987-09-30 |
| PL142710B2 (en) | 1987-11-30 |
| DK95385A (en) | 1985-09-06 |
| DE3506598C2 (en) | 1991-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |