JP6211367B2 - Supercharger cleaning device, supercharger provided with the same, internal combustion engine provided therewith, and supercharger cleaning method - Google Patents

Description

  The present invention relates to a supercharger cleaning device, a supercharger including the same, an internal combustion engine including the same, and a supercharger cleaning method.

  In a supercharger, soot (carbon-containing particles) is likely to be deposited in a portion exposed to combustion gas such as a turbine. If the accumulation of dust is left unattended and the maintenance is neglected, the rotation of the turbine becomes unstable, which may cause damage to the turbocharger and stop the main engine. However, the accumulated dust is fixed inside the supercharger and cannot be easily removed.

  Examples of the method for removing the fixed dust include warm water immersion cleaning, blast cleaning, cleaning with a cleaning agent, solid cleaning, and water cleaning. Hot water immersion cleaning, blast cleaning, and cleaning with a cleaning agent are performed with the supercharger stopped. Solid cleaning and water cleaning are performed during operation of the supercharger. Currently, solid cleaning is mainly employed as a method for removing the adhered dust (see Patent Document 1).

Japanese Patent Laid-Open No. 3-264736

Since solid cleaning uses collision energy, it is effective to remove the dust that has stuck to the rotor blades, but the removal effect on the stationary blades where the flow is slow is limited. There is a problem.
In addition, since the dust once fixed is not easily removed, if a solid cleaning agent having a high hardness is introduced to enhance the cleaning effect, there is a problem that wear of the blade tip portion is promoted.

On the other hand, in the supercharger, sulfuric acid is generated by the sulfur content contained in the fuel. There is a problem that sulfuric acid corrodes the inside of the supercharger. Patent Document 1 proposes to neutralize the condensed sulfuric acid by mixing Mg (OH) _{2 and the} like into a solid detergent and thereby suppressing corrosion of the boiler water pipe surface. However, it is difficult to uniformly adhere to the portion where dust adhesion is to be prevented, and there are technical problems as described below.

  The turbine of a supercharger of an internal combustion engine that is operating at a normal load rotates at high speed, and even when sprayed using magnesium hydroxide or the like as a cleaning agent, the cleaning agent is removed by centrifugal force due to the high rotation of the blade. There was a problem of not sticking to.

  Further, when magnesium hydroxide is exposed to a high temperature of 330 ° C. or more, it decomposes to become magnesium oxide, and there is a problem that the turbine cleaning effect cannot be achieved.

  Also, magnesium hydroxide is injected using compressed air supplied from another air compressor in the engine in accordance with the timing when the turbocharger rotates at a low speed when air is blown into the engine combustion chamber after the internal combustion engine is stopped. It is possible. However, there is a problem that it is difficult to measure the timing of injection, and automation is difficult.

The present invention has been made in view of such circumstances, and is a supercharger cleaning that prevents corrosion of a turbocharger turbine by attaching a cleaning agent to the turbocharger turbine with a simpler structure. It is an object of the present invention to provide a device, a supercharger provided with the same, an internal combustion engine provided with the same, and a method for cleaning the supercharger.

In order to solve the above-described problems, the supercharger cleaning device of the present invention, the supercharger including the supercharger, the internal combustion engine including the supercharger, and the supercharger cleaning method employ the following means.
The supercharger cleaning device according to the present invention stores a cleaning agent storage unit storing a cleaning agent for cleaning a supercharger driven by exhaust gas guided from an internal combustion engine, and compressed air leading to the internal combustion engine. A compressed air storage section, a first pipe for guiding a part of the compressed air in the compressed air storage section to the cleaning agent storage section, and the cleaning agent stored in the cleaning agent storage section as the compressed air. And a second pipe leading to the turbine of the supercharger, wherein the compressed air is supplied from the compressed air reservoir to the internal combustion engine at the time of supplying compressed air. With the compressed air supplied through one pipe, the cleaning agent stored in the cleaning agent reservoir is supplied to the turbine of the supercharger through the second pipe, and when the compressed air is supplied , Exhaust gas remaining after the internal combustion engine is stopped It is at the time of air blow to discharge and said Rukoto.

A part of the compressed air in the compressed air reservoir is led to the cleaning agent reservoir by the first pipe. Further, the compressed air is introduced from the cleaning agent storage unit together with the cleaning agent stored therein to the turbine of the supercharger through the second pipe. Thereby, the air which mixed the cleaning agent can be supplied to a supercharger. The second pipe is a condition suitable for spraying the cleaning agent when the compressed air is led to the internal combustion engine, specifically, when the internal combustion engine is started or stopped, for example, with a low turbocharger speed and a low turbine temperature. Therefore, the cleaning agent can be appropriately attached to the turbine that rotates at a low rotation speed. The number of rotations at this time is, for example, 200 rpm. As a result, spraying can be automatically performed under conditions suitable for spraying a cleaning agent having a low turbocharger speed and a low turbine temperature. Moreover, the compressor which guides the internal combustion engine and the compressor which guides the cleaning agent can be shared.
For example, magnesium hydroxide, calcium hydroxide, marine grid, activated carbon, or the like is used as the cleaning agent.

  Furthermore, in the supercharger cleaning device according to the present invention, the compressed air is supplied when the internal combustion engine is started or when an air blow is performed to discharge exhaust gas remaining after the internal combustion engine is stopped. To do.

Further, in the supercharger cleaning apparatus according to the present invention, the second pipe, characterized in that the supercharger from the compression check valve Ru impede the flow towards the air reservoir is provided .

A second pipe, by providing a check valve that prevents a flow directed from the turbocharger to the compressed air reservoir, at the time of normal operation of the internal combustion engine, flue gas from the turbocharger side to the compressed air reservoir is Backflow can be prevented.

  Furthermore, the supercharger according to the present invention includes a supercharger cleaning device.

  It is not necessary to grasp the timing of spraying the cleaning agent as a special timing, and it becomes possible to spray the cleaning agent automatically according to the timing when the compressed air is guided to the internal combustion engine, so that the turbocharger turbine is in a healthy state Can keep in.

  Furthermore, the internal combustion engine according to the present invention includes a supercharger.

  Since the supercharger can be kept in a healthy state, the operation stability of the internal combustion engine can be improved.

In yet cleaning method of the turbocharger according to the present invention, a cleaning agent reservoir for cleaning agents for the cleaning of the turbocharger stored driven by flue gas derived from the engine, to the internal combustion engine a compressed air reservoir which compressed air is stored for guiding, the said part of the compressed air of the compressed air reservoir and the first pipe that leads into the detergent reservoir, the reservoir has been the cleaning to the detergent reservoir A supercharger cleaning method comprising a supercharger cleaning device including a second pipe for introducing an agent to the turbine of the supercharger together with the compressed air, wherein the internal combustion engine includes the compressed air reservoir and the internal combustion engine. to when the air blow supplying the compressed air, by the compressed air supplied via the first pipe, the cleaning agent stored in the detergent storing part of the supercharger through the second pipe It supplies to a turbine.

  The second pipe is a condition suitable for spraying the cleaning agent when the compressed air is led to the internal combustion engine, specifically, when the internal combustion engine is started or stopped, for example, with a low turbocharger speed and a low turbine temperature. Therefore, the cleaning agent can be appropriately attached to the turbine that rotates at a low rotation speed. As a result, spraying can be automatically performed under conditions suitable for spraying a cleaning agent having a low turbocharger speed and a low turbine temperature. Moreover, the compressor which guides the internal combustion engine and the compressor which guides the cleaning agent can be shared.

  According to the present invention, since the cleaning agent is mixed with the compressed air flowing to the supercharger inlet when the internal combustion engine is started and when the air is blown, the cleaning agent is attached to the turbine in accordance with the timing of rotation at a low speed. Can be made. Thereby, adhesion of the cleaning agent to the turbine becomes easy, and corrosion of the turbocharger turbine can be prevented by a simpler structure, and performance degradation of the supercharger can be prevented.

1 is a schematic configuration diagram showing an internal combustion engine with a supercharger equipped with a supercharger cleaning device according to an embodiment of the present invention.

Hereinafter, an embodiment of a supercharger cleaning device according to the present invention, a supercharger including the supercharger, an internal combustion engine including the supercharger, and a supercharger cleaning method will be described with reference to FIG.
FIG. 1 shows a schematic configuration of an internal combustion engine with a supercharger provided with a supercharger cleaning device according to an embodiment of the present invention.

  The internal combustion engine 1 is, for example, a diesel engine for driving a main engine provided in a ship. The internal combustion engine 1 is driven by supplying fuel guided from a fuel injection pump (not shown) and compressed air guided from a supercharger 5 described later into the cylinder.

Turbocharger 5 to be cleaned is provided via a stay on top of the air cooler 7, a turbine (not shown) rotationally driven by a flue gas derived from the internal combustion engine 1, the turbine is connected to one end rotation The shaft includes an air compressor connected to the other end of the rotating shaft. In this air compressor, the rotational force obtained by the turbine is transmitted through a rotary shaft and is driven to rotate, thereby compressing the intake air. The compressed air compressed by the air compressor is cooled by the air cooler 7 and then supplied to the internal combustion engine 1.

Turbine is composed of turbine blades rotated by the flue gas, it is housed in the turbine casing. Turbine casing is connected to the exhaust manifold 2 of the engine 1 and turbocharger inlet 4 flue gas is led, a supercharger outlet 6 for guiding the flue gas passing through the turbine blade to the turbine out ing.

A start air tank (compressed air storage unit) 13 is connected to the internal combustion engine 1 via a main pipe 3. In the starting air tank 13, compressed air compressed to a predetermined pressure by the starting air compressor 12 is stored. The compressed air stored in the starting air tank 13 is used when the internal combustion engine 1 is started, and is used when air is blown to discharge exhaust gas remaining after the internal combustion engine 1 is stopped.
The main pipe 3 has an upstream end connected to the outlet side of the starting air tank 13 and a downstream end connected to the internal combustion engine 1 side. Further, an electromagnetic valve 15 for controlling the flowing air flow is provided in the middle position of the main pipe 3. The opening and closing of the electromagnetic valve 15 is controlled by the control unit 14.

  The cleaning device is connected to the first pipe 8 branched from the main pipe 3, the cleaning powder hopper (cleaning agent storage unit) 11 connected to the downstream end of the first pipe 8, and the outlet side of the cleaning powder hopper 11. The second pipe 9 is provided.

  The first pipe 8 has an upstream end (left side in the drawing) connected to the middle position of the main pipe 3 and downstream of the solenoid valve 15, and a downstream end connected to the inlet side of the cleaning powder hopper 11. .

  The cleaning powder hopper 11 is a container that can accommodate a cleaning agent (magnesium hydroxide powder). In place of magnesium hydroxide, calcium hydroxide, marine grid, activated carbon or the like may be used. The magnesium hydroxide powder is mixed and agitated by the air supplied from the first pipe 8 to the cleaning powder hopper 11, becomes a solid-gas two-phase flow, and flows out from the outlet of the cleaning powder hopper 11. Led to. A check valve 10 is provided in the middle of the second pipe 9. The check valve 10 allows an air flow flowing from the cleaning powder hopper 11 and the starting air tank 13 to the supercharger 5, while moving from the supercharger 5 to the cleaning powder hopper 11 and the starting air tank 13. Operates to block the incoming air flow.

  The second pipe 9 has an upstream end (left side in the figure) connected to the outlet side of the cleaning powder hopper 11 and a downstream end connected to the supercharger inlet 4. As a result, an air flow containing magnesium hydroxide powder is guided to the upstream side of the turbine of the supercharger 5.

Next, the operation of the internal combustion engine 1 with the supercharger 5 provided with the supercharger cleaning device having the above configuration will be described.
First, when starting the internal combustion engine 1, the electromagnetic valve 15 is opened by a command from the control unit 14, and the compressed air stored in the start air tank 13 passes through the main pipe 3 to the combustion chamber of the internal combustion engine 1. It is guided. Due to this compressed air, the crankshaft of the internal combustion engine 1 rotates to start the engine. In conjunction with this startup, the compressed air is guided to the cleaning powder hopper 11 through the first pipe 8.

  With the compressed air guided to the cleaning powder hopper 11, the cleaning powder (magnesium hydroxide powder) in the cleaning powder hopper 11 is guided to the supercharger inlet 4 through the second pipe 9 together with the compressed air.

The turbine of the supercharger 5 rotates at a low speed by the compressed air discharged from the internal combustion engine 1 at the start. The rotation speed at this time is, for example, 200 rpm (the rotation speed during normal operation is, for example, 13000 rpm).
Thus, the cleaning powder guided through the second pipe 9 is supplied to the turbine rotating at a low speed. Thereby, cleaning powder can be made to adhere to a turbine on suitable conditions.

When the start-up of the internal combustion engine 1 by the compressed air is completed, the electromagnetic valve 15 is closed by a command from the control unit 14 and the supply of the compressed air stored in the start-up air tank 13 is stopped. The internal combustion engine 1 performs a normal operation with fuel from a fuel injection pump (not shown) and compressed air from the supercharger 5. During this normal operation, a check valve 10 provided in the second pipe 9 prevents a flow from the supercharger 5 toward the washing powder hopper 11 or the start air tank 13.

Immediately after the internal combustion engine 1 is stopped, the electromagnetic valve 15 is opened by an instruction from the control unit 14 and stored in the start air tank 13 in order to perform air blow for discharging exhaust gas remaining in the combustion chamber. The compressed air is introduced into the combustion chamber of the internal combustion engine 1 through the main pipe 3. With this compressed air, the exhaust gas remaining in the combustion chamber of the internal combustion engine 1 is discharged to the outside through the supercharger 5. In conjunction with this air blow, the compressed air is guided to the cleaning powder hopper 11 through the first pipe 8.
The process of introducing the cleaning powder from the cleaning powder hopper 11 to the supercharger inlet 4 is the same as that at the start-up described above, and is therefore omitted.
Even at the time of air blow, since the turbine of the supercharger 5 rotates at a low speed as in the above-described start-up, the cleaning powder can adhere to the turbine under appropriate conditions.

As described above, according to the present embodiment, the following operational effects are obtained.
The compressed air is branched from the main pipe 3 and the compressed air is guided to the cleaning powder hopper 11 to supply the cleaning powder to the supercharger inlet 4. The cleaning powder is supplied to the turbine of the supercharger 5 at the time of start and air blow. It was decided to supply. Thereby, it is not necessary to grasp the timing of spraying the cleaning agent as a special timing, and it becomes possible to spray the cleaning agent automatically in accordance with the timing of guiding the compressed air to the internal combustion engine 1. The turbine can be kept healthy.
Moreover, since the rotation speed detection apparatus of the supercharger 5 for obtaining the timing which supplies washing powder etc. becomes unnecessary, the structure of a supercharger washing | cleaning apparatus can be made a simpler structure.

  When the internal combustion engine 1 is started or air blown, the turbine of the supercharger 5 rotates at a low rotational speed. Since the cleaning agent is supplied at this timing, the cleaning agent can be appropriately attached to the turbine of the supercharger 5.

  Since the turbine is rotating at a low speed, there is no risk of damaging the turbine even when a cleaning agent with high hardness such as activated carbon is used. As a result, a wide variety of cleaning agents can be selected.

The second pipe 9, so it was decided to provide a check valve 10 that prevents the flow directed from the turbocharger 5 to the compressed air reservoir 1 3, during the normal operation of the internal combustion engine 1, the compression from the supercharger 5 side it is possible to prevent the flue gas from flowing back to the air reservoir 13.

  Furthermore, the anticorrosion effect can be further enhanced by applying a heat-resistant paint to the turbine in the present invention. Although there is no restriction | limiting in particular as a heat resistant coating material, For example, Pyrosin (trademark) by Oshima Kogyo Co., Ltd. is mentioned. Thereby, since a metal surface and exhaust gas can be interrupted | blocked, a wet corrosion can be prevented. In addition, the standard thickness of heat-resistant paint is 12μm, about one-sixth of the standard standard thickness of paint, and the turbine surface of rust removal blast cleaning before painting is rough. The adhesion of magnesium oxide or the like is good, and the anticorrosion effect can be further enhanced by the heat resistant paint.

  In the embodiment described above, a diesel engine for driving a main engine provided on a ship as an internal combustion engine is used. However, the present invention is not limited to this, and may be applied to any internal combustion engine provided with a supercharger. can do.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Exhaust gas manifold 3 Main piping 4 Supercharger inlet 5 Supercharger 6 Supercharger outlet 7 Air cooler 8 First piping 9 Second piping 10 Check valve 11 Cleaning powder hopper (cleaning agent storage part)
12 Start Air Compressor 13 Start Air Tank (Compressed Air Storage Unit)
14 Control unit 15 Solenoid valve

Claims (5)

A cleaning agent storage unit storing a cleaning agent for cleaning the supercharger driven by the exhaust gas guided from the internal combustion engine;
A compressed air reservoir in which compressed air leading to the internal combustion engine is stored;
A first pipe for guiding a part of the compressed air in the compressed air reservoir to the cleaning agent reservoir;
A second pipe of the cleaning agent stored in the detergent storage unit together with the compressed air leading to the turbocharger turbine,
A supercharger cleaning device comprising:
When the compressed air is supplied from the compressed air reservoir to the internal combustion engine, the cleaning agent stored in the cleaner reservoir is supplied by the compressed air supplied through the first pipe. Supplied to the turbine of the supercharger via a second pipe ,
Wherein when compressed air supply, turbocharger cleaning device according to claim Rukoto is a time air blow for discharging the exhaust gas remaining after stop of the internal combustion engine. The supercharger cleaning apparatus according to claim 1, wherein the second pipe is provided with a check valve that prevents a flow from the supercharger toward the compressed air storage unit. A supercharger cleaning device according to claim 1 or 2 ,
A turbocharger characterized by comprising: An internal combustion engine comprising the supercharger according to claim 3 . A cleaning agent storage unit storing a cleaning agent for cleaning the supercharger driven by the exhaust gas guided from the internal combustion engine;
A compressed air reservoir in which compressed air leading to the internal combustion engine is stored;
A first pipe for guiding a part of the compressed air in the compressed air reservoir to the cleaning agent reservoir;
A second pipe for guiding the cleaning agent stored in the cleaning agent storage unit to the turbocharger turbine together with the compressed air;
A method of cleaning a supercharger using a supercharger cleaning device comprising:
At the time of air blowing for supplying the compressed air from the compressed air storage unit to the internal combustion engine, the cleaning agent stored in the cleaning agent storage unit by the compressed air supplied through the first pipe is A method for cleaning a supercharger, characterized in that the turbocharger is supplied to a turbine of the supercharger via two pipes.

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