EP0146062A2 - Procédé et dispositif pour récupérer des résidus d'huiles pour combustion - Google Patents
Procédé et dispositif pour récupérer des résidus d'huiles pour combustion Download PDFInfo
- Publication number
- EP0146062A2 EP0146062A2 EP84114620A EP84114620A EP0146062A2 EP 0146062 A2 EP0146062 A2 EP 0146062A2 EP 84114620 A EP84114620 A EP 84114620A EP 84114620 A EP84114620 A EP 84114620A EP 0146062 A2 EP0146062 A2 EP 0146062A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sludge
- container
- oil sludge
- water content
- water
- 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.)
- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/06—Working-up pitch, asphalt, bitumen by distillation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
- C10G7/04—Dewatering
Definitions
- the invention relates to a method and a device for treating oil sludge, which is obtained in ship or land operation, for combustion.
- the oil sludge which accumulates, for example, on ships when cleaning fuels and lubricants from separators and filters or from water separators, contains various impurities and in particular has a high water content and low calorific value, so that it cannot be used in this form on board.
- the oil sludge can be delivered ashore, which is very expensive due to the necessary lay time at the appropriate acceptance points and requires a correspondingly large sludge storage tank on board.
- the oil sludge can be burned with a suitable burner in an auxiliary boiler, so that the energy contained in it can still be used for on-board operation.
- the sludge can only be burned with the addition of additional fuel, which is to be regarded as uneconomical, since the use of the fuel in a different application normally results in a higher efficiency.
- the oil sludge has a high viscosity because of the proportions of heavy oil it contains and because of its high water content, which preclude circulation and thus even heating of the mass in a container in an economically reasonable time.
- the oil sludge can be in the form of a dispersion of oil and water, from which the water cannot be dissolved to a satisfactory extent when it is heated to its boiling temperature. It is also difficult to determine an average water content in the case of a viscous mass in a container.
- the invention has for its object to provide a method and an apparatus with which the water content of the oil sludge obtained, for example, on board a ship can be reduced in an economically justifiable time and with waste heat available on board a ship, so that the calorific value of the oil sludge allows combustion without the addition of other fuels.
- a heated, vacuum-loaded container is partially filled with oil sludge.
- Oil sludge is continuously removed from the lower part of the tank, pumped through a pipeline running outside the tank and pumped into the upper part of the tank into the pressurized space above the liquid level, whereby the oil sludge fed in is distributed.
- the water content of the pumped quantity is measured during pumping and outside the container.
- At least part of the pumped oil sludge is discharged to a tank when the water content reaches less than 30% from the amount removed from the container.
- treated oil sludge is refilled into the container.
- the oil sludge is exposed to a vacuum that is between 0.04 and 0.4 bar.
- the oil sludge is heated to a temperature which is 15 to 30 ° C. above the boiling point of pure water at the same negative pressure.
- a negative pressure between o, o5 and o, 2 bar and a temperature of 20 ° C above the boiling point of water at this negative pressure are preferred. These conditions make it possible to heat the container with the waste heat that is present on board, for example with the warm engine cooling water.
- the oil sludge is preferably treated until a water content of 10 to 15% is reached.
- the device comprises a container with a level sensor for determining the liquid level and with devices for generating the negative pressure and for removing the steam, a feed pump for supplying the oil sludge from a collecting tank, lines and a sludge circulation pump for pumping the sludge with a capacitive measuring probe for determining the water content and in upper part of the container opposite the outlet opening of the sludge pressure line and above the maximum liquid level, a baffle plate that divides the oil sludge introduced.
- a feed line from a sludge collecting tank for the untreated sludge and a further line to a sludge storage tank in which the largely dewatered oil sludge is discharged are also provided.
- the container used had a volume of approximately 500 dm 3 .
- the system was filled with an average of approx. 230 dm 3 oil sludge, in which about 133 dm 3 water was bound.
- a circulation pump was used in the tests, its delivery rate was about 8 to 10 m 3 per hour.
- the temperature was raised above the boiling temperature corresponding to the pressure. Without circulation, there was increased blistering, which resulted in the formation of foam in the upper part of the container. The foam bubbles could get into the condenser with the water vapor, so that there is a risk that the condensate will be enriched with sludge particles.
- the fourth experiment was carried out over a long period of time with the same amount of sludge of 230 dm 3 at about 70 ° C. with a water separation of about 60 dm 3 / h until no more distillate was obtained.
- a laboratory test found that the sludge was drained to 0.2% water.
- the distillate contained 133 dm 3 of water and 14 dm 3 of light mineral oil, which settled on the water without difficulty, so that the water can be cleaned in a gravity separator, for example. That as Water obtained from the distillate corresponded to an original water content of 58% in the oil sludge. Mud particles could not be found in the water.
- the surface available for the escape of steam from the sludge can also be increased by suitable container shape or internals.
- suitable container shape or internals When dimensioning a plant, it should be noted that the composition of the oil sludge can vary widely, with the proportion of water bound as an emulsion being around 45 to 80% of the sludge.
- the preferred negative pressure of 0.04 to 0.4 bar enables the container to be heated with engine cooling water, e.g. 80 ° C or with steam from an exhaust gas boiler.
- the heating is controlled so that the temperature of the oil sludge remains below 100 ° C even at a pressure of 0.4 bar.
- a pressure between 0.05 and 0.2 bar is preferably selected, and the oil sludge is treated between 50 ° C. (at 0.05 bar) and approximately 80 ° C. (at 0.2 bar). Since the water-containing sludge has a very high viscosity, it must be heated to about 50 ° C. in order to be able to be pumped out of the sludge collecting tank.
- a pressure of 0.05 bar therefore only requires a slight heating of the tank in order to keep the sludge at this temperature.
- a pressure between 0.1 and 0.2 bar appears to be particularly favorable in order to be able to control the dewatering process by heating with the existing heating media, with slight pressure fluctuations, which should remain in this area, due to the feed of untreated sludge, the evaporation of the Water and the release of dewatered sludge can occur.
- Such a low content of finely divided water is advantageous for the combustion, so that a further dewatering of the sludge below an average of 10 to 15% is not necessary.
- the procedure for sludge dewatering is discontinuous, since untreated sludge is fed in as soon as the fill level falls below a predetermined value, and largely dewatered sludge is released when the measuring probe in the line through which the sludge is circulated detects a sufficiently low water content. This allows dewatered sludge to be withdrawn from the bottom of the tank at the same time and untreated sludge to be fed in at the top, the latter mixing with the dewatered sludge.
- the measurement values of the probe can be used to control the system in such a way that the valve for dispensing dewatered sludge is only opened at a lower water content and closed at a higher water content, so that in the Sludge storage tank sets a desired average water content. If sludge with a water content of 10% is to be burned, the discharge valve can be opened at 5% and closed at 15%. These deviations of + 5% from the average value are sufficient to compensate for fluctuations occurring during the delivery, without there being a considerably different composition of the dewatered sludge which could interfere with the combustion.
- the dewatering of the oil sludge according to the invention not only creates a possibility of being able to burn the sludge on board without the addition of fuel, but also reduces the amount of sludge to be stored on board to less than half, which is also important, if the sludge is not to be burned but delivered to a station on land.
- the reduction in water content also causes the viscosity of the slurry to decrease, making it easier to pump, and reducing its heating for pumping.
- FIG. 1 A preferred embodiment of an apparatus for carrying out the method is shown in the accompanying drawing.
- the drawing shows only a simplified diagram.
- a device provided for practical use can be provided with further valves and monitoring devices.
- Oil sludge heated to pumpability is fed from a sludge collecting tank 1 through the sludge pump 11 and the pressure line 12 into the container 2, a level measuring device 28, 29 switching the pump 11.
- the sludge is removed from the lower part 22 of the container 2 by a circulating pump 30 via the suction line 27 and pressed through the pressure lines 31, 32 and an outlet opening 25 into the upper part 21 of the container 2, where a baffle plate 26 is arranged .
- a capacitive measuring probe 33 for measuring the water content is located in the pressure line 31. It controls the valves 34, 35, which can also be combined into a single valve to circulate the sludge or when the water content is low dispense via line 36 into the sludge storage tank 3.
- an exhaust pipe 24 leads to a condenser 4, in which the separated steam is precipitated as a distillate.
- the distillate is fed through a line 51 to a distillate tank 5 and from this through a distillate pump 53 via a pressure-maintaining valve 54 and optionally a tank into a de-oiler, not shown, in which the light mineral oils contained in the distillate can be easily separated from the water.
- a vacuum generator 60 for example a water ring pump, is connected to the condenser 4 via line 61. Condensate that forms on the vacuum generator can be discharged into a bilge well.
- the condenser 4 is provided with cooling water lines 41, 47.
- the jacket 23 of the container 2 is heated via lines 37, 38 by a suitable heating medium, the supply of the medium being controlled by a temperature sensor 39 on the suction line 27.
- the method according to the invention creates the prerequisite for being able to use the energy still contained in the oil sludge by combustion in a boiler without adding valuable fuels.
- it is not limited to the oil sludge generated in normal ship operation, but can also be used with the oil sludge falling off during tank cleaning.
- the process can also be carried out with oil sludge from land installations and can be used for the dewatering of other sludges which contain a high water content and preferably also oil, even if the dewatered sludge is not intended to be burned.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Lubricants (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833344526 DE3344526C2 (de) | 1983-12-09 | 1983-12-09 | Aufbereitung von Ölschlamm für die Verbrennung und hierfür vorgesehene Einrichtung |
| DE3344526 | 1983-12-09 | ||
| DE3432210 | 1984-09-01 | ||
| DE19843432210 DE3432210A1 (de) | 1984-09-01 | 1984-09-01 | Aufbereitung von oelschlamm insbesondere fuer die verbrennung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0146062A2 true EP0146062A2 (fr) | 1985-06-26 |
| EP0146062A3 EP0146062A3 (fr) | 1987-04-29 |
Family
ID=25816302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84114620A Withdrawn EP0146062A3 (fr) | 1983-12-09 | 1984-12-01 | Procédé et dispositif pour récupérer des résidus d'huiles pour combustion |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0146062A3 (fr) |
| DK (1) | DK588384A (fr) |
| ES (1) | ES538404A0 (fr) |
| NO (1) | NO159575C (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5288413A (en) * | 1991-10-24 | 1994-02-22 | Shell Oil Company | Treatment of a waste sludge to produce a non-sticking fuel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2388931A (en) * | 1944-01-31 | 1945-11-13 | Universal Oil Prod Co | Fractionation |
| GB1147525A (en) * | 1966-07-20 | 1969-04-02 | Henry Balfour & Company Ltd | Method of and apparatus for treating a liquid |
| CA935756A (en) * | 1971-06-30 | 1973-10-23 | Bowers Brian | Method and apparatus for concentration of foaming liquids |
| DE2833106C2 (de) * | 1978-07-28 | 1982-10-28 | Marinetechnik Planungsgesellschaft Mbh, 2000 Hamburg | Verfahren und Vorrichtung zum Entölen von Bilgenwasser u.dgl. |
-
1984
- 1984-12-01 EP EP84114620A patent/EP0146062A3/fr not_active Withdrawn
- 1984-12-03 NO NO844813A patent/NO159575C/no unknown
- 1984-12-07 DK DK588384A patent/DK588384A/da not_active Application Discontinuation
- 1984-12-07 ES ES538404A patent/ES538404A0/es active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5288413A (en) * | 1991-10-24 | 1994-02-22 | Shell Oil Company | Treatment of a waste sludge to produce a non-sticking fuel |
Also Published As
| Publication number | Publication date |
|---|---|
| ES8601291A1 (es) | 1985-11-01 |
| NO159575C (no) | 1989-01-18 |
| DK588384D0 (da) | 1984-12-07 |
| ES538404A0 (es) | 1985-11-01 |
| EP0146062A3 (fr) | 1987-04-29 |
| NO159575B (no) | 1988-10-10 |
| NO844813L (no) | 1985-06-10 |
| DK588384A (da) | 1985-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): BE DE FR GB IT NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE FR GB IT NL SE |
|
| 17P | Request for examination filed |
Effective date: 19870602 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HOWALDTSWERKE-DEUTSCHE WERFT AG |
|
| 17Q | First examination report despatched |
Effective date: 19880322 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19890227 |
|
| R18W | Application withdrawn (corrected) |
Effective date: 19890227 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KNOTT, HERMS Inventor name: WETZEL, STEFAN |