WO2020065506A1 - Dispositif compresseur multi-étages à injection d'huile et procédé de commande d'un dispositif compresseur - Google Patents

Dispositif compresseur multi-étages à injection d'huile et procédé de commande d'un dispositif compresseur Download PDF

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Publication number
WO2020065506A1
WO2020065506A1 PCT/IB2019/058064 IB2019058064W WO2020065506A1 WO 2020065506 A1 WO2020065506 A1 WO 2020065506A1 IB 2019058064 W IB2019058064 W IB 2019058064W WO 2020065506 A1 WO2020065506 A1 WO 2020065506A1
Authority
WO
WIPO (PCT)
Prior art keywords
intercooler
pressure stage
stage compressor
compressor element
oil
Prior art date
Application number
PCT/IB2019/058064
Other languages
English (en)
Inventor
Stijn Broucke
Pieter DE SCHAMPHELAIRE
Original Assignee
Atlas Copco Airpower, Naamloze Vennootschap
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from BE20185657A external-priority patent/BE1026651B1/nl
Priority claimed from BE20185658A external-priority patent/BE1026652B1/nl
Priority claimed from BE20195205A external-priority patent/BE1026654B1/nl
Application filed by Atlas Copco Airpower, Naamloze Vennootschap filed Critical Atlas Copco Airpower, Naamloze Vennootschap
Priority to KR1020217012286A priority Critical patent/KR102674898B1/ko
Priority to BR112021005356-5A priority patent/BR112021005356A2/pt
Priority to EP19780416.4A priority patent/EP3857067B1/fr
Priority to US17/272,521 priority patent/US11519412B2/en
Publication of WO2020065506A1 publication Critical patent/WO2020065506A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B25/00—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/06—Mobile combinations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • F04C2270/195—Controlled or regulated

Definitions

  • the present. invention relates to an oil-injected mu1. t1 stage corapressor de ice.
  • An oil-injected multistage compressor device can be used as an alternative, in which, for example, an intercooler is provided between the first and second compressor elements, whereby the intercooler will actively extract heat from the compressed gas after the first compression stage.
  • an intercooler is provided between the first and second compressor elements, whereby the intercooler will actively extract heat from the compressed gas after the first compression stage.
  • the object of the present invention is an oil-injected multistage compressor device that comprises at least one low-pressure stage compressor element with a gas inlet for gas to be compressed and a gas outlet for low-pressure compressed gas, and a high-pressure stage compressor element with a gas inlet for low-pressure compressed gas and a gas outlet for high-pressure compressed gas, whereby the outlet of the low-pressure stage compressor element is connected to the gas inlet of the high-pressure stage compressor element by a conduit, with the characteristics that a regulatable intercooler provided between the low-pressure stage compressor element and the high-pressure stage compressor element in the aforementioned conduit, which is configured in such a way that the temperature at the gas inlet of the high-pressure stage compressor element can be regulated so that it is above the dew point, that the intercooler comprises a regulatable air cooler and/or a regulatable water cooler, and that the intercooler is configured in such a way that the temperature of the air or the -water can be changed by using a bypass conduit and/or by screening off part of the intercooler
  • the intercooler is also regulatabie; the intercooler can be configured so that the temperature at the gas inlet of the high-pressure stage compressor eiemexrt can be keot above the dew point. Keeping the temperature at the inlet of the high-pressure stage compressor element above the dew point prevents condensate from forming at this location.
  • the intercooler can be regulated to cool the gas less so that condensate does not form.
  • the intercooler can be made regulatable in various ways .
  • a requirement of the regulateble intercooler is that the degree of cooling of the gas, or the temperature drop of the gas, can be changed. This can be done, for example, by changing the cooling capacity of the intercooler and/or by guiding part of the gas via a bypass conduit instead of via the intercooler.
  • the dew point is not a fixed value but dep lds on various parameters such as temperature, humidity, and the pressure of the gas. There are various ways to determine this de point ,
  • the intercooler is provided with a heat pump ,
  • Thi s has the advantage that it is possible to cool to a much lower temperature, so that the maximum cooling capacity can be i chieved when there is no risk of condensate forming downstream of the intercooler, so that the high-pressure stage compressor element will be much more efficient.
  • the invention also relates to a method for controlling an oil- injected multistage compressor device with a regulatable intercooler, characterized in that the method comprises the following steps : - calculating or determining the dew point at a gas inlet of a high-pressure stage compressor element of the compressor device ;
  • Figure 1 shows the schematic for an oil-injected multistage compressor device according to the invention
  • Figures 2 and 3 show the schematics for a variant of Figure 1.
  • the schematically shown oil-injected multistage compressor device 1 in Figure 1 comprises two steps or ’’stages'' in this case: a low- pressure stage with a low-pressure stage compressor element 2 and a high-pressure stage with a high-pressure stage compressor element 3.
  • Both compressor elements 2 and 3 in this example are screw compressor elements, but this is not necessary for the invention since other types of compressors can also be used.
  • Both compressor elements 2 and 3 are also provided with an oil circuit for the injection of oil in the respective compression chambers of the compressor elements 2 and 3. For clarity, these oil circuits are not shown in the Figure.
  • the low-pressure stage compressor element 2 has a gas inlet 4a for gas to be compressed and an outlet 5a for low-pressure compressed gas .
  • Gas outlet 5a is connected to gas inlet 4b of the high-pressure stage compressor element 3 via conduit. 6.
  • the high-pressure stage compressor element 3 is also equipped with a gas outlet 5b for high-pressure compressed gas, whereby the outlet. 5b is connected to a liquid separator 7.
  • An intercooler 9 is included in the aforementioned conduit 6 between the low-pressure stage compressor element 2 and the high- pressure stage compressor element 3 which, according to the invention, can be regulated.
  • This intercooler 9 can be designed in various ways.
  • Intercooler 9 can, for example, include air cooling that can be controlled by a fan, for instance, whereby the air flow can be regulated by adjusting the speed of the fan.
  • intercooler 9 can include, for example, a water cooler that can be regulated by a valve, for instance, which may control the flow of the water.
  • intercooler 9 it is also possible, for example, to regulate intercooler 9 by changing the temperature of the air or water.
  • intercooler 9 is equipped with a heat pump 10, although this is not necessary for the invention.
  • This heat pump 10 may also be regulatabie, but this is not necessarily the case. With the help of heat pump 10, it will be possible to extract even more heat from the gas.
  • Compressor device 1 is also equipped with a control unit or regulator 11 for controlling or regulating intercooler 9. If heat pump 1G is regulatabie, this control unit or regulator 11 can also control heat pump 10.
  • first measuring means 12 are also provided in the form of a sensor 12a.
  • This sensor 12a is connected to the aforementioned control unit or regulator 11.
  • a sensor 12a that can measure one or more environmental parameters at the gas inlet 4a of the low- pressure stage compressor element 2.
  • This sensor 12a can measure the pressure, temperature, and/or humidity.
  • second measuring means 13 are provided, which measure the humidity at gas inlet 4b of high-pressure stage compressor element
  • These second measuring means 13 could be a sensor 13a, provided at gas inlet lb of high-pressure stage compressor element 3. The schematic for this is shown with a dotted line in the Figure.
  • device 1 as shown in. the example is equipped with third measuring means 14 in the for of a sensor 14a at gas inlet 4b of high-pressure stage compressor element 3 in order to measure the temperature at this location.
  • device 1 is net excluded for device 1 to be equipped with an oil-injection 15 so that oil can be injected into conduit 6 downstream from intercooler 9.
  • the schematic for this is shown with a dotted line.
  • the operation of the oil-injected multistage compressor device 1 is very simple and as follows.
  • the gas to be compressed e .g . air
  • gas inlet ia of low-pressure stage compressor element 2 and wrll undergo an first compression stage.
  • the partially compressed gas will flow via conduit 6 to intercooler 9, where it will be cooled and then to gas inlet 4b of high- pressure stage compressor element. 3 for subsequent compression. Oil will be injected into both low-pressure stage compressor element. 2 and in high-pressure stage compressor element 3, which ensures the lubrication and cooling of compressor elements 2, 3.
  • the compressed gas will leave high-pressure stage compressor element 3 via gas cutlet 5b and then be guided to oil separator 7.
  • the injected oil will be separated and the compressed gas can then possibly be guided to an aftercooler before being sent to consumers .
  • this intercooler 9 In order to ensure that condensate is not formed when the gas is cooled by intercooler 9, this intercooler 9 must be properly regulated to accommodate changes in the environmental parameters and/or drive parameters of compressor elements 2, 3. For this, the control unit or regulator 11 will regulate intercooler 9 so that the temperature of inlet 4b of high-pressure stage compressor element 3 is above the dew point. As previously mentioned, this results in no condensate forming after intercooler 9 at gas inlet 4b of high-pressure stage compressor element. 3.
  • the dew point or accordingly the presence of condensate, at gas inlet 4b of high-pressure stage compressor element 3 is determined or calculated.
  • the dew point depends on various parameters and is therefore a variable and not a fixed value ,
  • the dew point is determined by measuring the environmental parameters using a sensor 12a.
  • the measured values of sensor 12a are transmitted to the control unit or regulator 11, which calculates the dew point on this basis.
  • the oil-injected multistage compressor device 1 is equipped with a humidity sensor 13b at gas inlet 4b of high-pressure stage compressor element 3, it is also possible to directly determine the dew point, or accordingly the presence of condensate, based on measuring the humidity at gas inlet 4b. Humidity sensor 13b will also transmit the measured value to control unit 11 at this point.
  • Another alternative is to determine the dev/ point by following the course of the temperature at gas inlet 4b of high-pressure stage compressor element 3, e.g. by using temperature sensor 14b at inlet 4b of high-pressure stage compressor element 3 or another sensor specially provided for this purpose. In this case, temperature sensor 14b will transmit the mea sured values of the temperature at gas inlet 4b to the control unit or regulator 11, which monitors and evaluates the course of the measured temperatures to use as a basis for determining the dew point .
  • control unit or regulator 11 will regulate intercooler 9 as necessary so that the temperature at gas inlet 4b of high-pressure stage compressor element 3 is above the dew point.
  • control unit or regulator 11 will request the temperature at gas inlet. 4b using temperature sensor 14b and compare it. with the determined dew point,
  • Control unit 11 will allow intercooler 9 to cool more when this temperature at inlet 4b is higher than the dew point, since the temperature of the gas can fall even more without the formation of conde sate .
  • control unit 11 will start heat pump 10, Of course, ir. is also possible that heat pump 10 is continuously in operation and that the regulation is carried out only using inr.ercoo.1er 9.
  • control unit 11 allows an increase in cooling capacity first in intercooler 9 and then heat pump 10 or vice versa or both simultaneously or alternately. If the temperature at gas inlet 4b of high-pressure stage compressor element 3 is lower or equal to the dew point, control unit 11 will have intercooler 9 cool less, so that the temperature of the gas will rise to prevent the formation of condensate.
  • control unit 11 can first lower the cooling capacity of heat pump 10 or alternatively lower the cooling capacity of intercooler 9 and of heat pump 10, If the dew point drops, the control unit or regulator 11 can have intercooler 9 once again cool more, so that the temperature of the gas will fall again.
  • bypass conduit 16 is provided over intercooler 9, which bypass conduit 16 is configured to divert part of the gas so that it can flow directly from low-pressure stage compress r element 2 to high-pressure stage compressor element. 3 without passing through intercooler 9.
  • bypass conduit 16 can be equipped with a valve 17 to regulate the amount of gas flowing through bypass conduit 16. In this case, valve 17 is connected to the control unit or regulator 11 for its control.
  • Figure 3 shows yet another design embodiment of intercooler 9, whereby a part of intercooler 9 can be screened off, e . g. with a plate 18 or similar, so that not the entire intercooler S is used. In other words, the gas to be cooled is not exposed to the entire intercooler 9.
  • the present invention is by no means limited to the embodiments described as examples and shown in the figures, but an oil-injected multistage compressor device according to the invention and a method for controlling a compressor device can be achieved following different variants without going beyond the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un dispositif compresseur multi-étages à injection d'huile comprenant au moins un élément de compresseur à basse pression (2) pourvu d'une entrée de gaz (4a) pour du gaz à comprimer et d'une sortie de gaz (5a) pour le gaz comprimé à basse pression, et un élément de compresseur étage à haute pression (3) pourvu d'une entrée de gaz (4b) pour le gaz comprimé à basse pression et d'une sortie de gaz (5b) pour le gaz comprimé à haute pression, la sortie de gaz (5a) de l'élément de compresseur étage à basse pression (2) étant reliée à l'entrée (4b) de l'élément de compresseur étage à haute pression (3) par l'intermédiaire d'un conduit (6). L'invention est caractérisée en ce que, dans le conduit susmentionné (6) entre l'élément de compresseur étage à basse pression (2) et l'élément de compresseur étage à haute pression (3), se trouve un refroidisseur intermédiaire régulable (9) qui est conçu de telle sorte que la température au niveau de l'entrée de gaz (4b) de l'élément de compresseur étage à haute pression (3) peut être régulée afin de se trouver au-dessus du point de rosée, en ce que le refroidisseur intermédiaire (9) comprend un refroidisseur d'air régulable et/ou un refroidisseur d'eau régulable, et en ce que le refroidisseur intermédiaire (9) est conçu de telle sorte que la température de l'air ou de l'eau peut être modifiée à l'aide d'un conduit de dérivation (16) et/ou par séparation d'une partie du refroidisseur intermédiaire (9).
PCT/IB2019/058064 2018-09-25 2019-09-24 Dispositif compresseur multi-étages à injection d'huile et procédé de commande d'un dispositif compresseur WO2020065506A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020217012286A KR102674898B1 (ko) 2018-09-25 2019-09-24 오일 주입식 다단 압축기 장치 및 이러한 압축기 장치를 제어하는 방법
BR112021005356-5A BR112021005356A2 (pt) 2018-09-25 2019-09-24 dispositivo compressor de múltiplos estágios com injeção de óleo e método para controlar um dispositivo compressor
EP19780416.4A EP3857067B1 (fr) 2018-09-25 2019-09-24 Dispositif de compresseur à multi-étages avec injection d'huile et procédé pour contrôler un tel compresseur
US17/272,521 US11519412B2 (en) 2018-09-25 2019-09-24 Oil-injected multistage compressor device and method for controlling a compressor device

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
BE2018/5658 2018-09-25
BE2018/5657 2018-09-25
BE20185657A BE1026651B1 (nl) 2018-09-25 2018-09-25 Oliegeïnjecteerde meertraps compressorinrichting en werkwijze om een dergelijke compressorinrichting aan te sturen
BE20185658A BE1026652B1 (nl) 2018-09-25 2018-09-25 Oliegeïnjecteerde meertraps compressorinrichting en werkwijze om een dergelijke compressorinrichting aan te sturen
BE2019/5205 2019-04-01
BE20195205A BE1026654B1 (nl) 2018-09-25 2019-04-01 Oliegeïnjecteerde meertraps compressorinrichting en werkwijze voor het aansturen van een compressorinrichting

Publications (1)

Publication Number Publication Date
WO2020065506A1 true WO2020065506A1 (fr) 2020-04-02

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Application Number Title Priority Date Filing Date
PCT/IB2019/058064 WO2020065506A1 (fr) 2018-09-25 2019-09-24 Dispositif compresseur multi-étages à injection d'huile et procédé de commande d'un dispositif compresseur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022185189A1 (fr) * 2021-03-02 2022-09-09 Atlas Copco Airpower, Naamloze Vennootschap Dispositif de compresseur à plusieurs étages sans huile mobile et procédé de commande d'un tel dispositif de compresseur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759052A (en) * 1972-02-28 1973-09-18 Maekawa Seisakusho Kk Method of controlling high stage and low stage compressors
US5236311A (en) * 1992-01-09 1993-08-17 Tecumseh Products Company Compressor device for controlling oil level in two-stage high dome compressor
US20040217180A1 (en) * 2003-04-30 2004-11-04 Ming-Te Lu Temperature control system for compressor exhaust
US20110036110A1 (en) * 2008-05-02 2011-02-17 Daikin Industries, Ltd. Refrigeration apparatus
US20120023978A1 (en) * 2010-07-28 2012-02-02 Chae Sunam Refrigerator and driving method thereof
US20170268498A1 (en) * 2016-03-16 2017-09-21 Hitachi Industrial Equipment Systems Co., Ltd. Multistage Compressor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759052A (en) * 1972-02-28 1973-09-18 Maekawa Seisakusho Kk Method of controlling high stage and low stage compressors
US5236311A (en) * 1992-01-09 1993-08-17 Tecumseh Products Company Compressor device for controlling oil level in two-stage high dome compressor
US20040217180A1 (en) * 2003-04-30 2004-11-04 Ming-Te Lu Temperature control system for compressor exhaust
US20110036110A1 (en) * 2008-05-02 2011-02-17 Daikin Industries, Ltd. Refrigeration apparatus
US20120023978A1 (en) * 2010-07-28 2012-02-02 Chae Sunam Refrigerator and driving method thereof
US20170268498A1 (en) * 2016-03-16 2017-09-21 Hitachi Industrial Equipment Systems Co., Ltd. Multistage Compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022185189A1 (fr) * 2021-03-02 2022-09-09 Atlas Copco Airpower, Naamloze Vennootschap Dispositif de compresseur à plusieurs étages sans huile mobile et procédé de commande d'un tel dispositif de compresseur
BE1029158B1 (nl) * 2021-03-02 2022-10-03 Atlas Copco Airpower Nv Mobiele olievrije meertraps compressorinrichting en werkwijze om dergelijke compressorinrichting aan te sturen

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