JPS6146653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for cleaning exhaust turbine blades, exhaust gas injection nozzle blades, and exhaust gas passages in a turbocharger turbine.

Diesel engines used in ships and the like are equipped with a supercharger that increases output by driving a turbine using exhaust gas and sending compressed air into the cylinders to increase the density of intake air. However, when this supercharger is used for a long period of time, solid matter derived from exhaust gas components accumulates on the turbine blades, nozzle blades, and gas passages, inhibiting normal exhaust gas operation and reducing the efficiency of the supercharger turbine. I learned to do it. Therefore, it is necessary to frequently clean the exhaust gas passage system including the turbine blades even while the ship is in motion.

[Conventional technology]

Conventionally, cleaning work has been carried out by flowing fresh water into the exhaust gas flow path system.

[Problem that the invention seeks to solve]

However, during navigation, the temperature inside the diesel engine's supercharger is always around 400 degrees Celsius. Therefore, when injecting room temperature fresh water under such operating conditions, there was a risk that the turbine blades and nozzle blades would be rapidly cooled, causing damage to both blades. It was necessary to lower the For this reason, each time the above-mentioned cleaning work is performed, it is necessary to lower the turbocharger temperature by lowering the diesel engine's output, that is, the rotation speed. It took approximately one hour, during which time the vessel was forced to sail at a reduced speed. Furthermore, the use of fresh water has the disadvantage that the sulfur dioxide gas component in the exhaust gas reacts with water to produce dilute sulfuric acid, resulting in sulfuric acid corrosion on the surfaces of the turbine blades and nozzle blades.

[Means for solving problems]

The object of the present invention is to provide a method and apparatus for cleaning a turbocharger turbine using granular coconut shell activated carbon instead of fresh water, thereby completing the cleaning work in a short time without slowing down the engine, and reducing the amount of sulfuric acid on the blade surface. The purpose is to reduce the corrosive effect.

The means for this purpose is to inject a predetermined amount of granular coconut shell activated carbon into the exhaust gas inlet passage upstream of the injection nozzle of the exhaust turbine together with the accompanying pressurized fluid at desired intervals during the operation of the supercharger. The above-mentioned input granular coconut shell activated carbon is sequentially flowed down between the injection nozzle blades, the exhaust turbine blade surfaces, and the inner wall surface of the exhaust gas outlet passage downstream thereof, scraping off deposits attached to each blade surface and removing the deposits from the exhaust gas outlet. This is a method for cleaning a turbocharger turbine in which the exhaust gas is removed from the side by combustion and gasification to lose its form and is discharged to the outside, and the exhaust gas is located upstream of the exhaust injection nozzle of the turbocharger exhaust turbine. A sealed container filled with a certain amount of granular coconut shell activated carbon for cleaning is placed near the manifold collecting pipe, and a stop valve for introducing granular coconut shell activated carbon is provided on the conduit connecting the filling container and the collecting pipe. This cleaning device for a turbocharger turbine includes a pressurized fluid stop valve on a conduit connecting a filling container to a pressurized fluid source.

[Effect]

As described above, the present invention provides a cleaning method and apparatus using granular coconut shell activated carbon instead of fresh water as a cleaning agent.

Therefore, there is no need to damage the exhaust gas injection nozzle blades or exhaust turbine blades due to the cooling effect, there is no need to slow down the engine to lower the temperature inside the supercharger, and one cleaning operation takes less than one minute. It can be completed within a short time, and the sulfur dioxide gas contained in the combustion exhaust gas reacts with fresh water to produce dilute sulfuric acid, which reduces the occurrence of sulfuric acid corrosion on the blade surfaces inside the supercharger. Summer.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 1 is a perspective view of a supercharger 10 to which a supercharger turbine cleaning method according to the present invention is applied, and a supercharger turbine cleaning device 20 according to the present invention for carrying out the method. be.

The turbocharger turbine cleaning device 20 is arranged close to above the exhaust manifold collecting pipe 14 connected to the sides of the three main combustion cylinders (not shown) of the diesel engine (Figs. 1 and 2). . The device 2
0 is a cylindrical container 21 (FIG. 3) filled with granular coconut shell activated carbon 25, a granular coconut shell activated carbon supply conduit 24 that connects the container 21 and the exhaust manifold collecting pipe 14, and a pressurized container such as a compressed air tank. fluid source 26
The pressurized fluid conduit 23 communicates with the container 21 (FIGS. 1, 2, and 3). Furthermore, a granular coconut shell activated carbon outlet 2 is provided on the supply conduit 24.
A stop valve 31 is provided adjacent to the pressurized fluid source 26 on the pressurized fluid conduit 23 , and a stop valve 31 is provided adjacent to the pressurized fluid source 26 .
2 (Fig. 1). Further, a granular coconut shell activated carbon charging port 29 is formed on the top surface 30 (FIG. 3) of the filling container 21, and a cap 22 is screwed into the charging port 29 (FIG. 3).

The operation of the supercharger turbine cleaning device 20 according to the present invention configured as described above is performed as follows. First, with the pressurized fluid stop valve 32 and the granular coconut shell activated carbon injection stop valve 31 closed, the cap 22 is removed, and the granular coconut shell activated carbon 25 is filled into the container 21 .

As is well known, the granular coconut shell activated carbon 25 is a combustible granule, and unlike grains such as rice, many protrusions are formed on its surface. The particle size is about 2 to 3 mm, and the total weight charged at one time is about 2 kg.

On the other hand, the pressure of air, which is a pressurized fluid, is 3.5 to 4 kg/
^cm2 . Next, without reducing the output of the main engine and thus maintaining the normal operating state of the supercharger 10, the pressurized fluid stop valve 32 is opened and the granular coconut shell activated carbon injection stop valve 31 is opened. shell activated carbon 2
5 is pumped by the pressure of the pressurized fluid injected into the container 21 (FIG. 3) through the conduit 23, and passes through the supply conduit 24 into the exhaust manifold collecting pipe 14 (the first
Fig. 2). Therefore, the granular coconut shell activated carbon 25 entrained into the exhaust gas by the compressed air is scattered toward the periphery along with the exhaust gas to the supercharger 10.
The air flows into the injection nozzle blade 15 and further collides with the exhaust turbine blade 16. Thereafter, the granular coconut shell activated carbon 25 flows down the exhaust turbine blade 16 and reaches the chimney passage through the next exhaust pipe system equipment such as an exhaust economizer, but when flowing down these exhaust passages, it also flows inside those passages. Wall surfaces become washed, and chimneys often lose their shape due to the combustion process.

〔Effect of the invention〕

As described above, according to the turbocharger turbine cleaning method and apparatus according to the present invention, granular coconut shell activated carbon is used as a cleaning agent instead of fresh water, so the exhaust gas injection nozzle blade and the One cleaning operation can be completed in an extremely short time of less than 1 minute without causing damage to the exhaust turbine blades and without having to slow down the engine to lower the temperature inside the supercharger. The sulfur dioxide gas contained therein reacts with fresh water to produce dilute sulfuric acid, thereby reducing the occurrence of sulfuric acid corrosion on the blade surfaces inside the supercharger.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a turbocharger and its turbine cleaning device in which the method for cleaning a turbocharger turbine according to the present invention is adopted, and FIG. 2 is a diagrammatic illustration for explaining the method and device according to the present invention. The explanatory drawing, FIG. 3, shows a sectional view of a filling container filled with solid particles. DESCRIPTION OF SYMBOLS 10...Supercharger, 14...Exhaust manifold collecting pipe, 15...Exhaust gas injection nozzle blade, 16...Exhaust turbine blade, 20...Turbine cleaning device for supercharger, 21...Granular coconut shell activated carbon Sealed filling container, 2
3... Pressurized fluid conduit, 24... Granular coconut shell activated carbon supply conduit, 25... Granular coconut shell activated carbon, 26...
Pressurized fluid source, 27...granular coconut shell activated carbon outlet,
31... Stop valve for charging granular coconut shell activated carbon, 32...
Stop valve for pressurized fluid.

Claims (1)

[Claims] 1. A predetermined amount of granular coconut shell activated carbon is injected into the exhaust gas inlet passage upstream of the injection nozzle of the exhaust turbine together with the accompanying pressurized fluid at desired intervals during the operation of the supercharger. Then, the input granular coconut shell activated carbon is sequentially flowed down between the injection nozzle blades, the exhaust turbine blade surfaces, and into the exhaust gas outlet passage downstream thereof, and in the meantime, the above-mentioned blade surfaces and the inner wall surfaces of the passages are scrubbed and cleaned. A method for cleaning a turbocharger turbine in which the exhaust gas is discharged to the outside from the outlet side with a combustion effect. 2. A sealed filling container filled with a certain amount of granular granular shell activated carbon for cleaning is placed in the vicinity of the exhaust manifold collecting pipe located upstream of the exhaust injection nozzle of the exhaust turbine for the turbocharger, and the filling container and the A turbocharger turbine comprising a stop valve for charging granular coconut shell activated carbon on a conduit connecting the collecting pipe and a pressurized fluid stop valve on a conduit connecting the filling container to a pressurized fluid source. cleaning equipment.