CH423723A - Process for blowing out filter cakes in disc filters with rotary cleaning - Google Patents
Process for blowing out filter cakes in disc filters with rotary cleaningInfo
- Publication number
- CH423723A CH423723A CH478564A CH478564A CH423723A CH 423723 A CH423723 A CH 423723A CH 478564 A CH478564 A CH 478564A CH 478564 A CH478564 A CH 478564A CH 423723 A CH423723 A CH 423723A
- Authority
- CH
- Switzerland
- Prior art keywords
- blowing out
- filter
- gas
- filter cakes
- rotary cleaning
- Prior art date
Links
- 239000012065 filter cake Substances 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 11
- 238000007664 blowing Methods 0.000 title claims description 9
- 238000004140 cleaning Methods 0.000 title claims description 3
- 239000007788 liquid Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 4
- 239000007789 gas Substances 0.000 description 13
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 1
- 239000008162 cooking oil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/18—Heating or cooling the filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
- B01D29/41—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube
- B01D29/416—Filtering tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
- B01D29/74—Regenerating the filter material in the filter by forces created by movement of the filter element involving centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
- B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
- B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
- B01D29/843—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating by direct contact with a fluid
Description
Verfahren zum Ausblasen von Filterkuchen in Scheibenfiltern mit Rotationsreinigung
Bei den in der modernen Trenntechnik mehr und mehr verwendeten Scheibenfiltern, bei welchen die Filterkuchen anschliessend an die Filtration durch Rotation der Filterelemente zwecks Austragung dieser Filterkuchen aus dem Filter abgeschleudert werden, ist es vielfach notwendig, die genannten Filterkuchen vor der Austragung durch Ausblasen mit Luft oder Gas von der Flüssigkeit, die sich noch im Filterkuchen befindet, weitgehendst zu befreien. Dieses Prozedere ist vielfach auch deshalb nötig, da zu nasse Filterkuchen beim Abschleudern und Austragen aus dem Filtergehäuse Schwierigkeiten verursachen können, indem sie bei zu hohem Feuchtigkeitsgehalt an den Filterelementen und den Wänden des Filtergehäuses festkleben können.
Das Ausblasen mit Luft oder Gas erfordert eine Menge von etwa 20 bis 200 Kubikmeter pro Quadratmeter und Stunde, damit die am Filterkuchen anhaftende Flüssigkeit durch das durch den Kuchen strömende Gas mitgerissen wird.
Wird nun für das Ausblasen Luft verwendet, so sind solche Mengen vielfach wirtschaftlich noch tragbar. Kann jedoch aus verfahrenstechnischen oder chemischen Gründen keine Luft verwendet werden, so steigen die Kosten des Ausblasens ganz beträchtlich. Dies ist z. B. der Fall beim Ausblasen von Filterkuchen bei der Bleicherdefiltration von Speise ölen, wo wegen der Oxydationsgefahr des Öles Inertgas (wie z. B. Stickstoff) verwendet werden muss.
Das Verfahren nach der vorliegenden Erfindung gestattet eine wirksame Ausblasung des Filterkuchens auf wirtschaftliche Weise. Es besteht darin, dass das zum Ausblasen des Filterkuchens verwendete Gas im geschlossenen Kreislauf durch den Filterkuchen ge drückt wird.
Im folgenden wird die Erfindung an einem Beispiel erläutert. Bei der praktischen Durchführung wird nach Entleerung des Filters nach beendeter Filtration der Filter mit dein für das Ausblasen vorgesehenen Gas gefüllt und ein Gasverdichter mit seiner Druckseite an das Filtergehäuse und mit seiner Saugseite an die Klarlaufleitung des Filters angeschlossen.
Nach Einschaltung des Verdichters strömt das Gas durch den Filterkuchen und reisst die in ihm verbliebenen Flüssigkeitsreste als Tröpfchen mit. In den Gaskreislauf zwischen Filterausgang und Verdichtereingang ist ein Flüssigkeitsabscheider, etwa ein Zyklon, eingebaut. Als Gasverdichter haben sich Hochdruckventilatoren, Drehkolbengebläse oder auch Kolbenkompressoren bewährt. Die Auswahl erfolgt je nach dem Widerstand des Filterkuchens.
Bei Anwendung des beschriebenen Verfahrens ist eine hohe Wirtschaftlichkeit auch bei wertvollen Inertgasen gegeben, wodurch in vielen Fällen ein wirksames Ausblasen des Filterkuchens überhaupt erst möglich oder diskutabel ist.
Sofern die aus dem Filterkuchen zu entfernende Flüssigkeit relativ leicht verdampft und demzufolge in dem zirkulierenden Gas einen gewissen Dampfdruck (Sättigung) erzeugt, kann in den Gaskreislauf ein Kühlaggregat eingebaut werden, mit Hilfe dessen die kondensierende Flüssigkeit ausgeschieden und die Sättigung entsprechend verringert werden kann. Das zirkulierende Gas entfernt dann die im Filterkuchen enthaltene Flüssigkeit nicht nur durch mechanisches Mitreissen, sondern auch durch Verdampfung, respektive Verdunstung. Wenn zudem das zirkulierende Gas mit einem Wärmeaustauscher erhitzt wird, kann dieser Verdampfungseffekt entsprechend erhöht werden.
Process for blowing out filter cakes in disc filters with rotary cleaning
In the case of disc filters, which are more and more used in modern separation technology, in which the filter cakes are thrown off after the filtration by rotating the filter elements for the purpose of discharging these filter cakes from the filter, it is often necessary to blow out the filter cakes with air or To largely free gas from the liquid that is still in the filter cake. This procedure is often necessary because filter cakes that are too wet can cause difficulties when being thrown off and discharged from the filter housing because they can stick to the filter elements and the walls of the filter housing if the moisture content is too high.
Blowing out with air or gas requires an amount of about 20 to 200 cubic meters per square meter per hour so that the liquid adhering to the filter cake is carried away by the gas flowing through the cake.
If air is used for blowing out, such amounts are often still economically viable. However, if air cannot be used for procedural or chemical reasons, the cost of blowing increases considerably. This is e.g. B. the case when blowing out filter cakes in the bleaching earth filtration of cooking oils, where inert gas (such as nitrogen) must be used because of the risk of oxidation of the oil.
The method of the present invention allows the filter cake to be blown out efficiently in an economical manner. It consists in the gas used to blow out the filter cake being pressed through the filter cake in a closed circuit.
The invention is explained below using an example. In practical implementation, after the filter has been emptied and the filtration is complete, the filter is filled with the gas intended for blowing out and a gas compressor is connected with its pressure side to the filter housing and its suction side to the clear flow line of the filter.
When the compressor is switched on, the gas flows through the filter cake and carries away the remaining liquid in the form of droplets. A liquid separator, such as a cyclone, is built into the gas circuit between the filter outlet and the compressor inlet. High-pressure fans, rotary piston blowers or piston compressors have proven themselves as gas compressors. The selection is made according to the resistance of the filter cake.
When using the process described, there is a high level of economy, even with valuable inert gases, which in many cases makes it possible or even debatable to effectively blow out the filter cake.
If the liquid to be removed from the filter cake evaporates relatively easily and consequently generates a certain vapor pressure (saturation) in the circulating gas, a cooling unit can be installed in the gas circuit, with the help of which the condensing liquid can be separated and the saturation can be reduced accordingly. The circulating gas then removes the liquid contained in the filter cake not only through mechanical entrainment, but also through evaporation or evaporation. In addition, if the circulating gas is heated with a heat exchanger, this evaporation effect can be increased accordingly.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH478564A CH423723A (en) | 1964-04-13 | 1964-04-13 | Process for blowing out filter cakes in disc filters with rotary cleaning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH478564A CH423723A (en) | 1964-04-13 | 1964-04-13 | Process for blowing out filter cakes in disc filters with rotary cleaning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH423723A true CH423723A (en) | 1966-11-15 |
Family
ID=4282495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH478564A CH423723A (en) | 1964-04-13 | 1964-04-13 | Process for blowing out filter cakes in disc filters with rotary cleaning |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH423723A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991004778A1 (en) * | 1989-10-04 | 1991-04-18 | Kent Strid | Method and device for filtering of suspensions |
-
1964
- 1964-04-13 CH CH478564A patent/CH423723A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991004778A1 (en) * | 1989-10-04 | 1991-04-18 | Kent Strid | Method and device for filtering of suspensions |
| US5149449A (en) * | 1989-10-04 | 1992-09-22 | Kent Strid | Method and device for filturing of suspensions |
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