EP4157478A1 - Verfahren zum bertreiben zweier fluidtechnisch parallel geschalteten entgaser - Google Patents
Verfahren zum bertreiben zweier fluidtechnisch parallel geschalteten entgaserInfo
- Publication number
- EP4157478A1 EP4157478A1 EP21728474.4A EP21728474A EP4157478A1 EP 4157478 A1 EP4157478 A1 EP 4157478A1 EP 21728474 A EP21728474 A EP 21728474A EP 4157478 A1 EP4157478 A1 EP 4157478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time
- vacuum degasser
- cycle
- modified
- inlet valve
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0036—Flash degasification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0063—Regulation, control including valves and floats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
Definitions
- the invention relates to a method for operating two vacuum degassers connected in parallel.
- a vacuum degasser is known from DE 10 2020202 024, which was published afterwards.
- the object of the invention is to increase the redundancy by connecting two vacuum degassers in parallel and to provide a method for operating the two vacuum degassers.
- the inventive method is used for degassing a fluid circuit.
- the fluid circuit is a cooling circuit.
- the fluid circuit has a first vacuum degasser, the first vacuum degasser having a first inlet valve, a first degassing chamber, a first outlet valve and a first pump.
- the vacuum degasser can also have a more complex structure, for example as known from DE 10 2020 202 024.
- the first pump of the first vacuum degasser is operated continuously. The first pump thus continuously conveys fluid from the first degassing chamber back into the fluid circuit.
- the pump is therefore not temporarily separated from the degassing space, for example by closing a valve, but is continuously fluidly connected to the first degassing space.
- the first vacuum degasser is operated in two cycle steps: in one In the first cycle step the first inlet valve is open for a first time, in a second cycle step the first inlet valve is closed for a second time.
- first cycle step fluid thus flows from the fluid circuit through the first inlet valve into the first degassing space and is at the same time conveyed back into the fluid circuit by the first pump from the first degassing space. No fluid can flow in during the second cycle step because the first inlet valve is closed.
- the first pump continues to deliver fluid from the first degassing chamber and thus generates a negative pressure in the first degassing chamber at the end of the second cycle step, so that fluid which then flows into the negative pressure of the first degassing chamber in the next first cycle step is degassed.
- the duration of the cycle of the first vacuum degasser is formed from the sum of the first time and the second time, since the cycle consists of these two cycle steps.
- the fluid circuit has a second vacuum degasser.
- the second vacuum degasser has a second inlet valve, a second degassing chamber, a second outlet valve and a second pump.
- the second vacuum degasser is operated in two cycle steps. In the first cycle step, the second inlet valve is open for a third time, while in the second cycle step the second inlet valve is closed for a fourth time.
- the basic process is the same.
- the second pump can be of a different type than the first pump in order to make the simultaneous failure of both pumps less likely.
- the duration of the cycle of the second vacuum degasser is thus formed analogously from the sum of the third time and the fourth time.
- the first time is replaced by a modified first time or the third time is replaced by a modified third time at least in individual cycles. This also makes it possible to change the phase position of the first vacuum degasser relative to the second vacuum degasser
- the aim of the process is to avoid parallel running of the cycles of the first vacuum degasser and the second vacuum degasser and thus to minimize pressure fluctuations in the fluid circuit.
- continuous pumping enables continuous operation of the pump, which is advantageous for the service life of the pump.
- this also enables a smaller and therefore quieter pump.
- Another great advantage is that the two vacuum degassers can be switched on practically at any time interval. After only a few cycles, the method according to the invention ensures that these two have an optimal phase relationship with one another.
- the first outlet valve is necessary in order to be able to remove the gas that has escaped from the fluid in the first degassing chamber from the fluid circuit.
- the second outlet valve is also necessary in order to be able to remove the gas that has escaped from the fluid in the second degassing chamber from the fluid circuit. Possible modes of operation within the cycle steps can be found in DE 10 2020 202 024, for example.
- a control unit which controls the first inlet valve and the second inlet valve is particularly preferably used to carry out the method.
- the first time, the second time, the third time and the fourth time are stored in the control unit.
- This control device also preferably has a clock.
- the control unit can further be connected, for example, to a first pressure measuring device, which is connected to the first degassing chamber, and a second pressure measuring device, which is connected to the second degassing chamber.
- a modified first time and / or a modified third time can be stored in the control unit.
- a rule for generating a modified first time and / or a modified third time can be stored in the control unit.
- the first pump and the second pump for the control unit can also be regulated.
- the first vacuum degasser and the second vacuum degasser can not only be regulated via the control unit, but can also be switched on and off via the control unit.
- the second and fourth times are stored in the control unit.
- a modified first time and a modified third time are also stored in the control unit.
- This control device also preferably has a clock.
- the control unit is connected to a first pressure measuring device, which is connected to the first degassing space, and a second pressure measuring device, which is connected to the second degassing space.
- a first limit value for the pressure that must be exceeded in the respective degassing space during the first and third time is also stored in the control unit.
- a second limit value for the pressure which must be fallen below in the respective degassing space during the second and fourth time can also be stored.
- a temperature sensor can also be attached to the degassing space so that the first limit value or the second limit value can also be stored as a function of the temperature.
- the control unit opens the first inlet valve at a first point in time and the second inlet valve at a second point in time and keeps it open until the first limit value for the pressure is exceeded. At the same time, the control unit measures the duration of the filling process and saves this time as the first or third time. After the first pressure is exceeded, the control unit closes the first inlet valve for the duration of the second time and the second inlet valve for the duration of the fourth time.
- the control unit in this alternative embodiment is set up to measure, with the aid of the clock, the first time and the third time which the degassing spaces need in order to reach a certain pressure.
- the control unit is set up to also determine the second time and fourth time or the entire cycle duration of the respective vacuum degassers. From the measured times, the control unit determines the transit time difference of the respective throughput times and / or the time offset of the respective switching points.
- the control unit is also set up to replace the first and third time with the modified first time or the modified third time when predetermined limit values for the transit time difference and / or the time offset are exceeded.
- the modified first time and the modified third time are selected in such a way that, after the time has elapsed, the predetermined limit values for the transit time difference and / or the time offset are restored are undercut. This means in particular that the first inlet valve or second inlet valve remains open for a further time after the specific pressure has been reached.
- the modified third time can therefore consist of the third time and an additional time interval At.
- the first time is replaced by a modified first time if the duration of the cycle of the first vacuum degasser is shorter than the duration of the cycle of the second vacuum degasser, or the third time is replaced by a modified third time if the The duration of the cycle of the first vacuum degasser is greater than the duration of the cycle of the second vacuum degasser.
- the faster cycle is thus modified, particularly preferably slowed down. For example, if the cycle of the first vacuum degasser were normally about 1 second faster than the cycle of the second vacuum degasser, the first time could be extended by 10 seconds every 10 cycles. This makes it possible to compensate for both small and large differences in a simple manner.
- the modified first time is obtained by adding a time interval At to the first time, or the modified third time is obtained by adding a time interval At to the third time.
- the time interval At is preferably selected in the range from (sum of the first time, the second time, the third time and the fourth time) divided by 40 to (sum of the first time, the second time, the third time and the fourth time ) divided by 8.
- the first time, if the first vacuum degasser is faster, or the third time, if the second vacuum degasser is faster, would accordingly be lengthened by this interval.
- the first time, the second time, the third time and the fourth time and also the time interval At are stored in the control unit.
- a fixed cycle point is defined which is used jointly for both vacuum degassers.
- the time difference between the fixed cycle point of the first vacuum degasser and the fixed cycle point of the second vacuum degasser is measured.
- Opening or closing the inlet valve is particularly suitable as a fixed cycle point. With a perfect phase shift, the time difference would ideally correspond to half the averaged cycle duration.
- the first time or the third time can be modified in the next cycle. It is also possible to calculate the exact difference between the measured time difference and half the averaged cycle duration and to use this value for At and thus modify the first time or the third time in the next cycle. Due to the much simpler control, however, a constant choice of At is often easier, even if the dynamic method enables operation closer to the optimum.
- the time difference can be recorded in a comparatively simple manner in a control unit.
- the time difference between the opening of the first inlet valve and the opening of the second inlet valve, for example, or the time difference between the closing of the first inlet valve and the closing of the second inlet valve, for example, can easily be measured .
- the first time is replaced by a modified first time or the third time is replaced by a modified third time, provided that the measured time difference is the sum of the first time, the second time, the third time and the fourth time) divided by 4 by more than the time interval At deviates.
- a first vacuum degasser with a first flow rate regulating device fluidly arranged in front of the first degassing chamber and / or a second vacuum degasser with a second fluidly arranged in front of the second degassing chamber is used Flow rate control device selected.
- a flow control device can only be inserted upstream of the faster vacuum degasser. It is also possible to arrange a flow rate control device in front of both vacuum degassers during manufacture and, if necessary, in ignorance of which one will be faster.
- the flow rate regulating device only serves to roughly set the first vacuum degasser and the second vacuum degasser to a similar cycle duration.
- the flow through the first vacuum degasser and thus the first time is changed and / or by means of the second flow rate regulating device, the flow through the second vacuum degasser and thus the third time is changed, so that the sum of the first time and the second time with a tolerance of ⁇ 15% is equal to the sum of the third time and the fourth time.
- a fill level sensor is provided for a minimum fill level in the degassing spaces. But this is a little more complex. Therefore, this alternative is not preferred.
- a first pressure is measured in the first degassing space and a second pressure is measured in the second degassing space. The time difference between the pressure maximum in the first degassing chamber and the pressure maximum in the second degassing chamber is measured If the deviation is greater than At / 2, for example, the first time or the third time can be modified in the next cycle.
- the invention relates to the use of the method according to the invention in a submarine with a fluid circuit, the method according to the invention being carried out for degassing a fluid circuit.
- the submarine is particularly preferably a military submarine with a fuel cell device, in which failure safety thus has a high priority.
- the process can be adapted accordingly to three, four or more vacuum degassers connected in parallel, the time difference between the individual vacuum degassers then being set to the cycle time divided by the number of degassers.
- FIG. 1 fluid circuit with two vacuum degassers.
- FIG. 2 time axis without modification.
- FIG. 3 time axis with modification
- a fluid circuit with two vacuum degassers 10, 20 is shown.
- the fluid circuit serves as a coolant circuit for a fuel cell device 40, in which a coolant pump 50 transports the coolant via a heat exchanger 70.
- a pressure equalization tank 30 is connected to the circuit in order to be able, for example, to compensate for changes in volume due to changes in the temperature of the coolant.
- the arrows shown serve to illustrate the ok
- Coolant flow and the coolant flow direction are divided upstream of the fuel cell device 40, for example and preferably 80% to 95% of the coolant flows through the fuel cell device 40. Only 5% to 20% of the coolant flows through the first vacuum degasser 10 or the second vacuum degasser 20.
- the coolant circuit can also be operated at least for a short time without the two vacuum degassers 10, 20, for example in order to reduce the acoustic signature for a short time by switching it off.
- the first vacuum degasser 10 and the second vacuum degasser 20 are connected in parallel with the fuel cell device 40.
- the first vacuum degasser 10 has a first inlet valve 12, a first degassing chamber 14 and a first pump 16.
- the second vacuum degasser 20 has a second inlet valve 22, a second degassing space 24 and a second pump 26.
- the first inlet valve 12 and the second inlet valve 22 are controlled via a control unit 60 in accordance with the method according to the invention. This is shown on the basis of the time courses in FIGS. 2 and 3.
- the 2 initially shows the course of the first time 110, the second time 120, the third time 130 and the fourth time 140.
- the upper graph is intended to show the state of the first inlet valve 12. If the graph is high, the first inlet valve 12 is open, if the graph is at the bottom, the first inlet valve 12 is closed.
- the lower graph is intended to show the state of the second intake valve 22. If the graph is high, the second inlet valve is open, if the graph is down, the second inlet valve 22 is closed.
- the first time 110 is 35 s
- the second time 120 35 s
- the third time 40 S and the fourth time 40 s fourth time period 40 chosen to be of the same length, which is only used for simplification and better clarity. In reality, all four times will be different from each other.
- the first vacuum degasser 10 and the second vacuum degasser 20 run in perfect opposite directions, the pressure fluctuations in the fluid circuit are minimal. Due to the difference in the cycle duration of 10 s, the Cycles relative to each other, so that after a certain time they would run in parallel and thus the pressure fluctuations would be maximal.
- the first time 110 is modified to a modified first time 112, since the cycle duration of the first vacuum degasser 10 is shorter than the cycle duration of the second vacuum degasser 20. This is shown in FIG. For this purpose, a time interval At of 20 s is added so that a modified first time 120 of 55 s results.
- first vacuum degasser 12 first inlet valve 14 first degassing chamber 16 first pump 20 second vacuum degasser
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020206554.3A DE102020206554B3 (de) | 2020-05-26 | 2020-05-26 | Verfahren zum Betreiben zweier fluidtechnisch parallel geschalteter Vakuumentgaser und Verwendung des Verfahrens |
| PCT/EP2021/063126 WO2021239508A1 (de) | 2020-05-26 | 2021-05-18 | Verfahren zum bertreiben zweier fluidtechnisch parallel geschalteten entgaser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4157478A1 true EP4157478A1 (de) | 2023-04-05 |
Family
ID=76181081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21728474.4A Pending EP4157478A1 (de) | 2020-05-26 | 2021-05-18 | Verfahren zum bertreiben zweier fluidtechnisch parallel geschalteten entgaser |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4157478A1 (de) |
| KR (1) | KR20230009961A (de) |
| DE (1) | DE102020206554B3 (de) |
| IL (1) | IL298433B1 (de) |
| WO (1) | WO2021239508A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021203948B4 (de) | 2021-04-21 | 2023-03-02 | Thyssenkrupp Ag | Unterseeboot mit gemeinsam redundanten Kühlkreisläufen, beispielsweise einer Brennstoffzelle und einer Batterie |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1243378B (it) * | 1990-07-27 | 1994-06-10 | Loctite Corp | Procedimento ed impianto per l'erogazione particolarmente di un prodotto sigillante/adesivo |
| JP2002239303A (ja) | 2001-02-16 | 2002-08-27 | Tsi:Kk | 液体の脱気装置 |
| DE102011083988A1 (de) | 2011-10-04 | 2013-04-04 | Thyssenkrupp Marine Systems Gmbh | Verfahren zum Kühlen einer wärmeerzeugenden Vorrichtung eines Unterseeboots und insbesondere zum Kühlen einer Brennstoffzellenanlage in einem Unterseeboot und Kühlvorrichtung zum Kühlen einer wärmeerzeugenden Vorrichtung in einem Unterseeboot und insbesondere zum Kühlen einer Brennstoffzellenanlage in einem Unterseeboot |
| DE202011108135U1 (de) * | 2011-11-11 | 2012-02-06 | Metso Paper, Inc. | Vorrichtung zur Entlüftung eines auf eine Faserbahn aufzutragenden Beschichtungsmedium |
| CH709041A2 (de) * | 2013-12-16 | 2015-06-30 | Disgas Gmbh | Verfahren und Vorrichtung zur Entgasung eines Mediums in einem Kreislauf. |
| DE102020202024A1 (de) | 2020-02-18 | 2021-08-19 | Thyssenkrupp Ag | Vakuumentgaser mit einer Messfunktion zur Ermittlung der Konzentration an gelöstem Gas in einem Fluid und Verfahren zum Betreiben des Vakuumentgasers |
-
2020
- 2020-05-26 DE DE102020206554.3A patent/DE102020206554B3/de active Active
-
2021
- 2021-05-18 WO PCT/EP2021/063126 patent/WO2021239508A1/de not_active Ceased
- 2021-05-18 KR KR1020227043386A patent/KR20230009961A/ko not_active Ceased
- 2021-05-18 EP EP21728474.4A patent/EP4157478A1/de active Pending
- 2021-05-18 IL IL298433A patent/IL298433B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IL298433B1 (en) | 2026-04-01 |
| IL298433A (en) | 2023-01-01 |
| DE102020206554B3 (de) | 2021-10-28 |
| KR20230009961A (ko) | 2023-01-17 |
| WO2021239508A1 (de) | 2021-12-02 |
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Owner name: TKMS GMBH Owner name: THYSSENKRUPP AG |