KR20240066237A - Gas cooling device - Google Patents

Abstract

The present invention relates to a cooling device for cooling gases in an internal combustion engine, an internal combustion engine equipped with a cooling device, and a method for maintaining the cooling device. A cooling device (1) for cooling gas in a large internal combustion engine (100) includes a housing (2) with a gas inlet (3) and a gas outlet (4). The cooling device (1) includes a first cleaning device (50), which first cleaning device (50) includes a fluid atomizing system (51), the fluid atomizing system (51) comprising an array of spray nozzles (52). comprising at least two arrays 53 and at least one valve 54a, 54b, which valves allow passage through only a portion of the array 53 of the array spray nozzles 52 at a time, in particular one of the array spray nozzles 52. Allows passage only to array 53. Alternatively or additionally, the cooling device ( 1 ) comprises a second cleaning device ( 10 ) downstream of the first cooling stage ( 12 ) of the cooling device ( 1 ). It comprises at least one first fluid spray nozzle (11) arranged upstream of the second cooling stage (13) of the device (1). Alternatively or additionally, the cooling device (1) comprises a third cleaning device (20), which third cleaning device (20) comprises a lubricant spraying system (21), which preferably comprises at least one It comprises a lubricant spray nozzle (22), which is connected or connectable to the lubricant rail (23) and is preferably arranged close to the gas inlet (3).

Description

Gas cooling device {GAS COOLING DEVICE}

The present invention relates to a cooling device for cooling gases in an internal combustion engine, an internal combustion engine with a cooling device, and a method for maintaining the cooling device.

The invention preferably relates to internal combustion engines, such as large marine engines or stationary engines with a cylinder internal diameter of at least 200 mm. The engine is preferably a two-stroke engine or a two-stroke crosshead engine. The engine may be a diesel or gas engine, dual fuel or multi-fuel engine. Combustion of liquid or gaseous fuel in such engines is also possible by self-ignition or forced ignition.

The internal combustion engine may be a two-stroke engine with longitudinal flushing.

Typically, a combustion engine includes at least one cylinder, a cylinder cover, a piston, a fuel supply system, and a scavenging air system. An exhaust valve may be disposed on the cylinder cover disposed at the top of the cylinder. Exhaust gases may be directed through an exhaust manifold downstream of the exhaust valve. The piston is arranged to be movable within the cylinder along a central axis between bottom dead center and top dead center. A scavenge air inlet may be placed at the bottom of the cylinder. Scavenging air may be provided by a scavenging air receiver.

The term internal combustion engine also refers to a large engine that can be operated in diesel mode (characterized by self-ignition of the fuel) as well as Otto mode (characterized by positive ignition of the fuel) or a mixture of both. . Additionally, the term internal combustion engine specifically includes dual fuel engines and larger engines in which self-ignition of one fuel is used for positive ignition of the other fuel.

The engine speed is preferably less than 800 RPM, more preferably less than 200 RPM, especially for four-stroke engines, which indicates the designation of a low-speed engine.

The fuel may be diesel oil or marine diesel oil or heavy fuel oil or emulsion or slurry or methanol or ethanol and gases such as liquid natural gas (LNG), liquid petroleum gas (LPG), etc.

Other possible fuels that can be added on request are LBG (liquefied biogas), biological fuels (e.g. oil made from algae or seaweed), ammonia, synthetic fuels of CO2 (e.g. power-to-gas or Power-to-liquid).

Large ships, especially those for the transport of goods, are generally powered by internal combustion engines, especially diesel and/or gas engines, usually two-stroke crosshead engines.

In order to reduce the reactivity of the gas/air mixture and methane slip, it is known to provide exhaust gas recirculation (EGR), especially low pressure exhaust gas recirculation (EGR), as shown for example in EP 3 722 572 A1. Some of the exhaust gases are recirculated into the cylinder, while other portions of the exhaust gases are guided into a funnel and released into the surrounding environment.

While the high-pressure EGR path is interposed more or less directly between the exhaust manifold and the intake manifold, the low-pressure EGR path can branch downstream of the turbocharger's turbine, with recirculated exhaust gases returning to the turbocharger with fresh air. can be guided through a compressor. Typically, the EGR path is provided with an EGR cooling device.

A scavenge air cooler can be arranged upstream of the air inlet, preferably upstream of the scavenge air reservoir and downstream of the compressor of the turbocharger.

If exhaust gases are recirculated, particulate matter resulting from combustion may deposit on the EGR cooler and/or scavenge air cooler, which may increase pressure drops, reduce cooling capacity, and/or cause premature wear. there is.

It is known to clean cooling devices.

WO2013165432A1 teaches removing the EGR cooler from the vehicle and mounting it on a cleaning station. For larger engines, removing the cooler may be inconvenient or impossible.

US8,375,713 B2 discloses a method for removing exhaust gas deposits from an EGR cooler by providing an on-board gas source and providing gas above atmospheric pressure to the EGR cooler.

US2016131088A1 discloses injecting fluid from a reservoir directly into an EGR cooler. If the EGR cooler is too warm from exhaust gases, especially at high loads, the fluid may evaporate without any cleaning effect.

According to EP3397846B1 for cleaning charge air coolers, water condenses on the heat exchanger surface and dirt is periodically washed away by the condensed water. The temperature of the heat exchanger surfaces must be adapted accordingly. DE 102012009319 A1 relates to a two-stroke heavy-duty diesel engine with a recirculating gas compressor and a steam turbine coupled thereto. The device includes one or more nozzles that inject water into the recirculation line upstream of the cooling device to create a humid environment. The humid environment forms an anti-liquid corrosion protection layer on the walls of the heat exchanger to prevent the soot contained in the exhaust gases from adhering.

EP 0701656 B1 discloses a large supercharged diesel engine comprising a recirculation passage for returning a portion of the exhaust gases to the engine cylinders, the recirculation passage having a plurality of water atomizer stages to purify the exhaust gases. Includes a unit for humidification with water.

The present invention provides gas cooling devices and internal combustion engines that avoid the disadvantages of the known ones, and in particular gas cooling devices, internal combustion engines and methods for maintaining cooling devices so that the need to remove and/or replace contaminated cooling devices is reduced. It is based on

The above object is achieved by the characteristic features of the independent claims.

A cooling device for cooling gases in a large internal combustion engine includes a housing, a gas inlet, and a gas outlet.

A large combustion engine includes at least one cylinder with an internal diameter of at least 200 mm.

The gas to be cooled may be scavenge air, i.e. fresh air, a mixture of fresh air and an inert gas, or a mixture of fresh air and exhaust gas. Alternatively, the gas to be cooled may be exhaust gas. The cooling device can thus be arranged in the internal combustion engine, for example in the scavenge air path or in the exhaust gas recirculation (EGR) path, in particular in the low pressure exhaust gas recirculation (lp-EGR) path or the high pressure exhaust gas recirculation (hp-EGR) path. there is.

The cooling device preferably comprises at least one cooling stage, preferably two cooling stages. At least one cooling stage is arranged in the housing, so that the gas to be cooled can enter the housing through the gas inlet, pass through the at least one cooling stage and exit the housing through the gas outlet.

In at least one cooling stage, heat is transferred from the gas to be cooled to the cooling device.

Heat can be transferred to a fluid such as air or water, or to a thermally conductive material such as metal.

The cooling device includes a first cleaning device, and the first cleaning device includes a fluid misting system. This fluid spray system includes at least two arrays of array spray nozzles and also includes at least one valve.

The at least one valve allows passage through only a portion of the array of array spray nozzles at a time, in particular to only one array of array spray nozzles.

Preferably each array of array spray nozzles is fluidly connected to a respective valve. The cooling device may include a multi-way valve to open and close the path to each array of array spray nozzles.

Accordingly, fluid can be directed to the cooling device through only a portion of the entire array of spray nozzles at a time. This may reduce the flow rate of the fluid.

At least one valve can be controlled by a control unit.

The flow rate of the fluid may be 100 l/h to 8000 l/h, preferably 200 l/h to 6000 l/h, more preferably 400 l/h to 4000 l/h.

Fluids injected into the cooling device, especially aqueous fluids or water, may condense on the cooling stage and form a protective layer that prevents contamination of the cooling stage surface. Additionally or alternatively, contaminants may be washed away from the surface.

Array spray nozzles can be placed in parallel spray lances. Preferably, at least five, more preferably at least seven array spray nozzles are disposed on the lance. Array spray nozzles may be placed equidistantly.

Each spray lance or combination of spray lances may define a respective array of array spray nozzles.

Each spray lance may include or be connected to a valve, or a group of spray lances may include a valve or be connected to a valve. The valve can be controlled by a control unit, so that part of the cardia lance acts at once.

For example, the first spraying lance or the second spraying lance, each of which is arranged next to the first spraying lance, act alternately.

The ratio between the inner diameter of the spray lance and the opening diameter of the array spray nozzle may be 10 to 60, preferably 20 to 50.

The inner diameter of the spray lance may be 10 mm to 70 mm, especially 32 mm to 50 mm. The spray lance may have a constant internal diameter over the length of the spray lance. Alternatively, the inner diameter may vary depending on the distance to the valve to provide constant fluid pressure and/or constant fluid flow along the spray lance.

Array spray nozzles may have an opening diameter of 0.5 mm to 2.5 mm, especially 1 mm to 1.6 mm.

All array spray nozzles can have the same opening diameter. Alternatively, the opening diameter may vary depending on the distance to the valve to provide constant fluid pressure and/or constant fluid flow along the spray lance and/or across the array of spray nozzles.

The valve can be controlled so that only a portion of the array spray nozzles act to form a protective film and all of the array spray nozzles act to flush out contaminants.

The valve can be controlled so that no fluid is released into the cooler, so intermittent injection can be achieved. The valves can be controlled so that more or fewer array spray nozzles can be set into action at a time depending, for example, on the temperature of the gas to be cooled, engine load, ambient conditions and/or type of fuel. In this way a higher or lower flow rate of fluid can be selected.

So, if possible, cleaning fluid can be saved.

The spray lance can be placed in a holder or fastening element that reduces vibration. The holder or fastening element may include a vibration damper that absorbs vibrations, especially vibrations arising from changing fluid flows.

Alternatively or additionally, the cooling device includes a second cleaning device comprising at least one first fluid spray nozzle, the spray nozzle downstream of the first cooling stage of the cooling device and on a second cooling stage of the cooling device. placed upstream.

In relation to the position of the first fluid spray nozzle, the terms “downstream” and “upstream” are used for the direction of flow of the gas to be cooled in the cooling device.

The first fluid spray nozzle is preferably a water spray nozzle. Typically, the gas to be cooled is cooled as it passes through the first cooling stage. Depending on the temperature of the gas to be cooled entering the gas inlet, the first cooling stage can be heated to such an extent that water evaporates immediately when sprayed into the first stage. Typically, these temperatures can be reached during engine operation.

Accordingly, fluid spray nozzles placed close to the gas inlet may have little or no cleaning effect during operation and may only be used when the engine is not running or is operating at low load.

Downstream of the first cooling stage, the gas to be cooled can reach a temperature at which the scrubbing water does not evaporate. The first fluid spray nozzle cleans the second cooling stage by washing away contaminants and can also be used during operation of the engine and cooling system.

The second cleaning device provides cleaning of a second cooling stage disposed downstream of the first cooling stage. In downstream cooling stages, the potential contamination is more significant because the open fluid diameter, defined by the spacing between heat exchange elements, is generally smaller than in upstream cooling stages.

Therefore, the second cleaning device provides very effective cleaning.

The first cleaning device may be disposed upstream of the first cooling stage. Alternatively, the first cleaning device may be arranged downstream of the first cooling stage of the cooling device and upstream of the second cooling stage of the cooling device, forming a second cleaning device as described above.

Additionally or alternatively, the cooling device includes a third cleaning device comprising a lubricant spray system that is or can be connected to a lubricant rail. The lubricant spraying system preferably includes at least one lubricant spraying nozzle. In the present application, lubricating oil may include any hydrocarbon-based liquid.

At least the lubricant spray system of the third cleaning device can be arranged close to the gas inlet. The lubricating oil can be distributed within the cooling device by the gas to be cooled.

A spray nozzle for evenly spraying the lubricant on the internal surface of the cooling device may be disposed inside the cooling device.

The lubricant spray system of the third cleaning device can alternatively be arranged outside the housing of the cooling device, upstream of the gas inlet, so that the lubricating oil is delivered into the cooling device together with the gas to be cooled.

Lubricating oils typically have a high evaporation temperature, so they maintain their cleaning function even when the temperature of the gas to be cooled is still high. So, even when the lubricant spray system of the third cleaning device is arranged upstream of all cooling stages, i.e. at the hot end of the cooler, for example upstream of or within the first cooling stage, the third cleaning device also It can be used during operation of the cooling device.

The lubricant rail may be connected or connectable to an engine lubricant supply system of an internal combustion engine, which engine lubricant supply system also provides cylinder oil for the cylinder.

The lubricant forms a film on the cooling device and wets the surface of the downstream cooling stage. The surface is thus kept clean from sediments. Draining the lubricant can remove contaminants from the cooling system.

The lubricant may contain a detergent to clean the surface of the cooling stage.

The cooling device may comprise only one cooling stage, preferably a shell-and-tube cooler.

The cooling device may include a first cooling stage disposed upstream of a second cooling stage. These cooling stages are therefore arranged so that the gas to be cooled is first guided through the first cooling stage and then through the second cooling stage. The first cooling stage is arranged downstream of the gas inlet and the second cooling stage is arranged upstream of the gas outlet, with respect to the flow direction of the gas to be cooled. Both cooling stages can be placed in the same housing.

The first cooling stage may be disposed above the second cooling stage. The cleaning fluid may exit through the second cooling stage and collect at the lowest point of the second cooling stage.

The lubricant may drain through the second cooling stage or through the first and second cooling stages and collect at the lowest point of the second cooling stage.

A fluid collection area may be arranged downstream of the second cooling stage, preferably below the second cooling stage.

The fluid collection area may be part of a fluid recirculation system, which may include a tank, at least one pump, a cooling device for cooling the fluid and/or a separator for separating the lubricant oil.

The first cooling stage may comprise cooling tubes, while the second cooling stage may comprise fins and preferably tubes.

Typically, the open flow diameter for the gas to be cooled is larger in the first cooling stage than in the second cooling stage. Therefore, the risk for hazardous contamination is higher in the second cooling stage. Therefore, by arranging the first fluid spray nozzle downstream of the first cooling stage and upstream of the second cooling stage, a reasonable cleaning effect is obtained.

Array At least two arrays of spray nozzles can be arranged in a plane. Preferably, the spray lances defining an array of array spray nozzles are arranged parallel in a plane.

A plurality of first fluid spray nozzles may be disposed in the first spray nozzle array. The spray nozzle array may be a planar spray nozzle array. Spray nozzles may be evenly disposed above the second cooling stage.

At least a portion of the first spray nozzles may be connected by a common rail. Preferably, all first fluid spray nozzles of the first spray nozzle array are connected by at least one common rail.

A plurality of lubricating oil spray nozzles can be arranged in a particularly planar second spray nozzle array. The spray nozzles may be evenly disposed above the first cooling stage.

The cooling device may include at least one second fluid spray nozzle, preferably a water spray nozzle, disposed proximate to the gas inlet to provide a cooling fluid, preferably a water-based cleaning fluid. The second fluid spray nozzle can be used to clean the first cooling stage when the engine is not running or when the engine is operating at low load. The second fluid spray nozzle may also be used to flush lubricant residues supplied by the third cleaning device.

A first fluid spray nozzle, preferably at least one second fluid spray nozzle, disposed close to the gas inlet may be connected or connectable to a fluid supply system.

The fluid supply system may include at least one of a tank containing a reservoir of cleaning fluid such as water, a pump, a filter for separating particulate matter, a heat exchanger for controlling a specific temperature range, a chemical dosage supply, and a water supply. there is. Water can be mixed with detergent. The tank may be connected to a heater to reduce the risk of ice forming within the reservoir.

Rinse water discharged below the cooling stage can be collected, filtered and recirculated within the fluid supply system.

According to the invention, the internal combustion engine, i.e. a large marine engine or stationary engine, preferably a two-stroke engine or a two-stroke crosshead engine, may comprise at least one cylinder with an inner diameter of at least 200 mm, As such, a cooling device for cooling the gas may be further included.

The cooling device within the internal combustion engine may be arranged as a scavenge air cooler for cooling the scavenge air.

Alternatively or additionally, the internal combustion engine may comprise an exhaust gas recirculation system and the gas cooling device may be arranged as an EGR cooling device. A gas cooling device may be placed within the EGR path.

The internal combustion engine may include a control unit for controlling the fluid spray system and setting valves to allow passage through only a portion of the array of spray nozzles at a time.

An internal combustion engine may include an engine lubricant supply system. An internal combustion engine may include a lubricant spray system connected to an engine lubricant supply system.

According to the invention, a method for maintaining a cooling device for cooling gases, preferably as described above, more preferably for maintaining a cooling device in a combustion engine as described above, includes cleaning and/or Includes contamination prevention steps.

For cleaning, an aqueous liquid is sprayed onto a second cleaning stage disposed downstream of the first cleaning stage of the cooling device by at least one first fluid spray nozzle disposed between the first cooling stage and the second cooling stage. .

To prevent contamination, and preferably for cleaning, a lubricant is sprayed into and/or inside the cooling device. The lubricant can be sprayed into the cooling device, preferably on at least one cooling stage, close to the inlet.

The lubricant may be sprayed into and/or within the cooling device and may form a lubricant film on at least a portion of the interior surface of the cooling device.

The water-based liquid may then be sprayed into and/or within the cooling device to wash away any remaining lubricant films while the engine is running or when the engine is not running.

The lubricant can be sprayed into and/or into the cooling device at a constant flow rate, preferably from 0.01 g/kWh to a maximum of 2 g/kWh per cylinder, pulsed regularly or as required. The spray pressure is greater than the gas pressure in the cooling device, preferably greater than 1 bar, more preferably greater than 2 bar.

The lubricant may be selected from the list of engine oils and may contain at least one of the following: mineral or synthetic base oil, mineral or synthetic thickeners, additives such as detergents, acid neutralizers (base species, e.g. CaCO3), dispersants and antioxidants. It can contain one.

Lubricating oils may contain other compounds that are not necessary for the purification or stability of the oil but have a function in the main oil application.

Further advantageous aspects of the invention are explained below by way of exemplary embodiments and drawings.

1 shows a schematic diagram of an internal combustion engine.
Figure 2 schematically shows a first example of a gas cooling device in side view.
Figure 3 schematically shows a second example of a gas cooling device in side view.
Figure 4 schematically shows a third example of a gas cooling device in a side view.
Figure 5 schematically shows the first cleaning device in plan view.

Figure 1 schematically shows an internal combustion engine 100. The internal combustion engine 100 includes one cylinder 101 with an inner diameter 102 of at least 200 mm. The internal combustion engine 100 includes a system 104 for exhaust gas recirculation with an EGR valve 111 and a back pressure valve 112 to control the amount of exhaust gases being recirculated.

The internal combustion engine 100 may include two cooling devices 1 for gas cooling, a scavenge air cooler 103 and an EGR cooling device 105.

The EGR cooling device 105 is disposed in the EGR path 107. In this case, the exhaust gas recirculation system 104 is such that the exhaust gas is branched downstream of the turbine 108 of the turbocharger 109 and is supplied to the compressor 110 and the scavenge air cooler of the turbocharger 109 together with fresh air. It is a low pressure EGR system guided through (103).

At least one of the scavenge air cooler 103 and the EGR cooling device 105 may be a cooling device 1 as shown in Figure 1 or Figure 2.

Figure 2 schematically shows a first example of a gas cooling device 1 in side view.

The cooling device (1) comprises a housing (2) with a gas inlet (3) and a gas outlet (4). The cooling device 1 comprises a first cooling stage 12 arranged inside the housing upstream of the second cooling stage 13 , which is also arranged in the housing 2 .

The first cooling stage 12 comprises a cooling tube 14 and the second cooling stage 13 comprises fins 15 so that the opening diameter of the gas to be cooled is such that the cooling device 1 It becomes smaller as it passes through. Due to the relatively small gap between the pins 15, there is a risk of clogging if contaminants stick to the surface.

Therefore, keeping the second cooling stage 13 clean is a major concern.

The cooling device (1) comprises a second cleaning device (10), wherein the second cleaning device (10) comprises a plurality of fluids arranged in the first spray nozzle array (16) and connected by a common rail (17). Includes a spray nozzle (11).

The fluid spray nozzle (11) is arranged downstream of the first cooling stage (12) and upstream of the second cooling stage (13).

In a separation stage 19 downstream of the second cooling stage 13, the liquid is separated from the cooled gas and the cooled gas is dried.

A fluid collection area (5) is disposed below the second cooling stage (13).

The cooling device (1) includes a second fluid spray nozzle (18) disposed close to the gas inlet (3).

Both the first fluid spray nozzle 11 and the second fluid spray nozzle 18 are connected to the fluid supply system 30. This fluid supply system 30 includes a tank 31, a pump 32, a filter 33, a heat exchanger 34, a chemical dosing supply 35, and a water supply 36. The water that collects in the fluid collection area can be directed into the tank, so that there is a fluid recirculation system. The filter 33 is for separating contaminants separated from the second cooling stage.

Figure 3 schematically shows a second example of the gas cooling device 1 in side view.

The cooling device 1 on the one hand comprises a second cleaning device 10 as shown in FIG. 2 and explained in connection with FIG. 2 . Accordingly, the same reference numerals are used in Figure 3.

The cooling device 1 further includes a third cleaning device 20 , where the third cleaning device 20 includes a lubricating oil spraying system 21 with a lubricating oil spraying nozzle 22 . The lubricant spray nozzle 22 is disposed upstream of the gas inlet 3.

The lubricant spray system 21 is connected to a lubricant rail 23, which is connected to the engine lubricant supply system 106.

The cooling device is provided with a lubricant to form a film on the surfaces of the first cooling stage 12 and the second cooling stage 13, so that contaminants are prevented from sticking.

The rinse lubricant carries contaminants into the fluid collection area (5).

Lubricating oil can be washed from the cooling stages 12, 13 by water provided by the second spray nozzle 18.

Lubricating oil can be separated from the washing water in a lubricating oil separator (37).

The second cleaning device 10 serves to clean the second cooling stage 13 even during engine operation, while the third cleaning device 20 prevents contamination and also cleans the first cooling stage 12 and the second cooling stage. It serves to clean the stage (13).

Figure 4 schematically shows a third example of the gas cooling device 1 in side view.

The cooling device 1 comprises only a single cooling stage 13.

The first cleaning device (50) is arranged upstream of the cooling stage (15) comprising the fluid spray system (51).

A fluid spray system 51 comprising at least two arrays 53 of array spray nozzles 52 includes at least one valve 54a, 54b (see FIG. 5 ) to control the flow of at least two arrays 53 of array spray nozzles 52 at a time. Only a portion of the array 53 is allowed to pass through.

Array spray nozzles 52 are connected to a fluid supply system 30 as shown in FIGS. 2 and 3.

FIG. 5 schematically shows in plan view an example of a first cleaning device 50 for use in the gas cooling device 1 as shown in FIG. 4 .

The first cleaning device 50 includes a group of spray lances 55a and a group of spray lances 55b arranged alternately and parallel in the same plane. Each spray lance 55a, 55b includes an array spray nozzle 52 not explicitly shown in FIG. 5 . Each spray lance 55a, 55b defines an array 53 of array spray nozzles 52.

The first cleaning device 50 further includes valves 54a, 54b in fluid communication with a group of spray lances 55a, 55b. The valves 54a, 54b are controlled by the controlled unit 56 and can be set to guide fluid through the first group of spray lances 55a or through the second group of spray lances 55b.

This makes it possible to insert uniformly distributed fluid into the cooling stage with reduced fluid flow compared to the case where all spray lances 55a, 55b are floating.

Alternatively, valves 54a, 54b may be configured to allow partial flow or no flow in an intermittent fluid discharge with full flow.

In this schematic diagram only four spray lances 55a, 55b are shown. Of course, the first cleaning device 50 may comprise an appropriate number of spray lances 55a, 55b grouped into multiple bundles with a corresponding number of spray lances 55a, 55b, each bundle having a valve. Connected to (54a, 54b).

Claims (15)

A cooling device (1) for cooling gas in a large internal combustion engine (100), the cooling device (1) comprising a housing (2) having a gas inlet (3) and a gas outlet (4),
The cooling device (1) comprises a first cleaning device (50), the first cleaning device (50) comprising a fluid atomizing system (51), the fluid atomizing system (51) comprising an array spray nozzle (52). comprising at least two arrays 53, wherein the first cleaning device also comprises at least one valve 54a, 54b, which controls a portion of the array 53 of the array spray nozzles 52 at a time. permit passage through the bay, in particular to only one array (53) of the array spray nozzles (52), and/or
The cooling device (1) comprises a second cleaning device (10), wherein the second cleaning device (10) comprises at least one first fluid spray nozzle (11), which spray nozzle (11) is used in the cooling device (1). ) is arranged downstream of the first cooling stage 12 of the cooling device 1 and upstream of the second cooling stage 13 of the cooling device 1, and/or
The cooling device (1) comprises a third cleaning device (20), which third cleaning device (20) comprises a lubricant spraying system (21), which spraying system preferably comprises at least one lubricant spraying nozzle. (22), the nozzle being connected or connectable to the lubricant rail (23), preferably arranged close to the gas inlet (3). According to claim 1,
The cooling device (1) comprises a first cooling stage (12) arranged in the housing (2) upstream of a second cooling stage (13) arranged in the housing (2). According to claim 2,
The first cooling stage (12) is disposed above the second cooling stage (13). According to claim 2 or 3,
Cooling device, wherein a fluid collection area (5) is arranged downstream of the second cooling stage (13), preferably below the second cooling stage (13). According to any one of claims 2 to 4,
The first cooling stage (12) comprises a cooling tube (14), and/or
The second cooling stage (13) comprises fins and/or tubes. The method according to any one of claims 1 to 5,
the array of array spray nozzles is disposed in a plane, and/or
A plurality of first fluid spray nozzles (11) are preferably arranged in a particularly planar first spray nozzle array (16) connected by a common rail (17), and/or
Cooling device, wherein a plurality of lubricating oil spray nozzles (22) are arranged in a particularly planar second spray nozzle array (24). The method according to any one of claims 1 to 6,
The array spray nozzle (52) and/or the first fluid spray nozzle (11), preferably at least one second fluid spray nozzle (18) disposed close to the gas inlet (3), are provided in the fluid supply system (30). ) connected to or capable of being connected to a cooling device. According to claim 7,
The fluid supply system 30 includes at least one of a tank 31, a pump 32, a filter 33, a heat exchanger 34, a chemical dosing supply 35 and a water supply 36. Device Internal combustion engine 100, i.e. a large marine engine or stationary engine, preferably a two-stroke engine or two-stroke crosshead engine,
The internal combustion engine 100 includes at least one cylinder 101 having an inner diameter 102 of at least 200 mm,
The internal combustion engine (100) comprises a cooling device (1) for cooling gas according to any one of claims 1 to 8. According to clause 9,
The cooling device (1) is arranged as a scavenge air cooler (103) and/or
The internal combustion engine (100) comprises an exhaust gas recirculation system (104), and the gas cooling device (1) is arranged as an EGR cooling device (105). According to claim 9 or 10,
The internal combustion engine (100) includes a lubricant atomizing system (21) connected to an engine lubricant supply system (106). Preferably for maintaining a cooling device for cooling the gas according to any one of claims 1 to 8, more preferably for cooling in a combustion engine according to any one of claims 9 to 11. As a method for maintaining a device,
comprising a cleaning step and/or a contamination prevention step,
For cleaning, a water-based liquid is continuously sprayed onto the cooling stages (12, 13) through at least two different arrays of the at least two arrays of spray nozzles (52), and/or
A water-based liquid for cleaning is supplied to the first cleaning stage of the cooling device (1) by means of at least one first fluid spray nozzle (11) arranged between the first cooling stage (12) and the second cooling stage (13). Sprayed onto a second cleaning stage (13) disposed downstream of (12), and/or
Method for maintaining a cooling device (1), wherein a lubricant is sprayed into and/or inside the cooling device (1) to prevent contamination and preferably for cleaning. According to claim 12,
A lubricant is sprayed into and/or inside the cooling device (1) to form a lubricant film on at least part of the surface of the cooling device (1), preferably a water-based liquid, which is then sprayed into and/or inside the cooling device (1). A method of removing the lubricant film by spraying it on. The method of claim 12 or 13,
The lubricating oil is sprayed into and/or inside the cooling device at a constant flow rate, preferably from 0.01 g/kWh to 2 g/kWh per cylinder, or periodically or as required. According to claim 13,
The method of claim 1 , wherein the lubricating oil includes at least one of a mineral or synthetic base oil, a mineral or synthetic thickener, an additive such as a detergent, an acid neutralizer (base species, e.g. CaCO3), a dispersant, and an antioxidant.