Lubricating oil cleaning system and lubricating oil cleaning method

Abstract

The present invention relates to a lubricating oil cleaning system and a lubricating oil cleaning method, and provides a lubricating oil cleaning system and a lubricating oil cleaning method capable of stably cleaning a stock solution containing ammonia water and a lubricating oil into a lubricating oil. A lubricating oil cleaning system (100) is capable of cleaning a stock solution (DO) mixed with ammonia water (AW) into a lubricating oil. A lubricating oil cleaning system (100) is provided with: an internal combustion engine (200); a lubricating oil cleaner (1) for separating a raw liquid (DO) containing a lubricating oil (LO) used in an internal combustion engine (200) into at least a light liquid that is a purified lubricating oil (LO) and a heavy liquid containing ammonia; and a water supply unit that supplies water (W) into the separation chamber (SZ) during operation of the lubricating oil cleaner (1).

Description

Technical Field

[0001] The present invention relates to a lubricating oil cleaning system and a lubricating oil cleaning method for cleaning lubricating oil containing ammonia water or the like. Background Art

[0002] As a countermeasure for promoting global warming, ammonia fuel that does not emit carbon dioxide, which is a greenhouse gas, during combustion, has attracted attention as an energy source for a society expected to achieve carbon neutrality. In recent years, the practical application of ammonia gas turbines and internal combustion engines corresponding to ammonia that can operate with liquid ammonia as the fuel of a ship has been promoted. In addition, as a plan using liquid ammonia as the fuel, the development of the navigation of an ammonia fuel ship, which is a so-called zero-emission ship, has also been promoted (for example, refer to Patent Document 1 and Patent Document 2).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 6934555 Gazette

[0006] Patent Document 2: Japanese Patent No. 6940727 Gazette

[0007] When liquid ammonia is used for an internal combustion engine of a ship or the like, there is a problem that unburned ammonia gas in the internal combustion engine dissolves in the moisture in the lubricating oil.

[0008] More specifically, moisture is mixed into the lubricating oil due to condensation during the operation or stop of the internal combustion engine. When the engine is operated without removing this moisture, the ammonia concentration in the internal combustion engine increases, and ammonia dissolves in the moisture in the lubricating oil.

[0009] There is a problem that materials exposed to ammonia water or an ammonia atmosphere are corroded. In addition, in a lubricating oil cleaner that separates the original liquid containing used lubricating oil into a heavy liquid and a light liquid (lubricating oil), when ammonia is mixed into the original liquid, the specific gravity of the heavy liquid decreases, the removal rate of the heavy liquid decreases, and there may be problems such as the light liquid (lubricating oil) flowing out from the heavy liquid side or the heavy liquid mixing into the light liquid. Summary of the Invention

[0010] The technical problem of the present invention is to provide a lubricating oil cleaning system and a lubricating oil cleaning method that can solve the above problems and stably separate lubricating oil from the original liquid containing ammonia water and lubricating oil.

[0011] In order to solve the above technical problems, the present invention provides a lubricating oil cleaning system that can clean a stock solution mixed with ammonia water into lubricating oil. The lubricating oil cleaning system includes: an internal combustion engine; a lubricating oil cleaner that separates a stock solution containing the lubricating oil used in the internal combustion engine into at least a light liquid as the purified lubricating oil and a heavy liquid containing ammonia; and a water supply unit that supplies water to a separation chamber during the operation of the lubricating oil cleaner.

[0012] In addition, the present invention provides a lubricating oil cleaning method that can clean a stock solution mixed with ammonia water into lubricating oil. The lubricating oil cleaning method includes: a centrifugal separation step of separating, by a lubricating oil cleaner, a stock solution containing the lubricating oil used in an internal combustion engine into at least a light liquid as the purified lubricating oil and a heavy liquid containing ammonia; and a water supply step of supplying water to a separation chamber during the operation of the lubricating oil cleaner.

[0013] Advantages of the Invention

[0014] The lubricating oil cleaning system and the lubricating oil cleaning method of the present invention can stably separate lubricating oil from a stock solution containing ammonia water and lubricating oil. Description of the Drawings

[0015] Figure 1 It is a block diagram showing a lubricating oil cleaning system and a lubricating oil cleaning method according to an embodiment of the present invention.

[0016] Figure 2 It is a central longitudinal sectional view showing a lubricating oil cleaner.

[0017] Figure 3 It is a central longitudinal sectional view of a rotating body of a lubricating oil cleaner.

[0018] Figure 4 It is a schematic view showing the state inside a rotating body when a normal lubricating oil is centrifugally separated by a lubricating oil cleaner.

[0019] Figure 5 It is a schematic view showing the state inside a rotating body when a general lubricating oil mixed with ammonia is centrifugally separated by a lubricating oil cleaner.

[0020] Figure 6 It is a view showing a lubricating oil cleaning method according to an embodiment of the present invention, and is a schematic view showing the state inside a rotating body when sealing water / replacement water is introduced into a lubricating oil mixed with ammonia and centrifugally separated by a lubricating oil cleaner.

[0021] Figure 7 It is a block diagram showing a modification of a lubricating oil cleaning system and a lubricating oil cleaning method according to an embodiment of the present invention.

[0022] Description of Reference Numerals:

[0023] 1: Lubricating oil cleaner; 9: Light liquid discharge section; 15: Heavy liquid discharge section; 100: Lubricating oil cleaning system; 110: Water supply pipeline (water supply unit); 120: Heavy liquid discharge pipeline (drainage unit); 130: Stock solution supply pipeline (separator inlet pipeline); 133: Stock solution return pipeline; 134: Three-way valve; 140: Light liquid discharge pipeline; 200: Internal combustion engine; 300: Lubricating oil tank; 400: Heater; 500: Waste liquid tank; 600: Neutralization tank; 700: Sludge tank; 810: Pressure sensor; 820: Moisture sensing sensor; 830: Ammonia sensor; 840: Leakage sensor; 900: Control device; AW: Ammonia water (heavy liquid); CA: Neutralizing agent; DO: Stock solution; LO: Lubricating oil (light liquid); P1: Lubricating oil supply pump; SG: Sludge; SZ: Separation chamber; SW: Waste liquid (separated water); W: Water. Detailed implementation mode

[0024] Refer to Figures 1 to 6 The lubricating oil cleaning system 100 and the lubricating oil cleaning method of the implementation mode of the present invention will be described in detail.

[0025] [Lubricating oil cleaning system]

[0026] Figure 1 The shown lubricating oil cleaning system 100 is a cleaner for purifying waste liquids SW such as used lubricating oil LO, fuel oil, and bilge water in an internal combustion engine 200 etc. provided in a limited installation space (such as an isolated island power plant, an existing power plant, etc.) on a ship or on land so that they can be reused.

[0027] Hereinafter, as an example of the lubricating oil cleaning system 100 of the present invention, the case where the used lubricating oil LO in the internal combustion engine 200 burning liquid ammonia is used as the waste liquid SW will be taken as an example for description.

[0028] In the internal combustion engine 200 using liquid ammonia as fuel, sludge SG and ammonia water AW may be mixed into the lubricating oil LO in the internal combustion engine 200.

[0029] The lubricating oil cleaning system 100 includes a lubricating oil cleaner 1. The lubricating oil cleaner 1 is a three-phase separation type separation plate type centrifugal separator that separates the stock solution DO into a light liquid, a heavy liquid, and sludge SG (solid component), where the stock solution DO is the lubricating oil LO mixed with ammonia water AW, the light liquid is the purified lubricating oil LO, and the heavy liquid is the ammonia water AW containing ammonia. More specifically, as Figure 1 Or Figure 3As shown, the lubricating oil cleaning system 100 mainly includes a lubricating oil tank 300, a lubricating oil supply pump P1, a heater 400, a lubricating oil cleaner 1, a sludge tank 700, a water supply pipeline 110 (water supply unit), a heavy liquid discharge pipeline 120 (drainage unit), a pressure sensor 810, a stock solution supply pipeline 130, a sludge discharge pipeline 160, and a control device 900. The lubricating oil cleaning system 100 is arranged inside a ship.

[0030] It should be noted that the light liquid discharge pipeline 140 may also be equipped with a pressure sensor 810, a moisture sensing sensor 820, and an ammonia sensor 830.

[0031] [Internal combustion engine]

[0032] Figure 1 The internal combustion engine 200 shown is a marine diesel internal combustion engine arranged inside a ship, and uses liquid ammonia with zero emissions of carbon dioxide, a greenhouse gas, as fuel. Therefore, the internal combustion engine 200 may also be a gas turbine. The internal combustion engine 200 is composed of a mechanism that only connects the crankshaft and the piston through a connecting rod. In the internal combustion engine 200, a side pressure, which is a lateral force, is generated on the piston, and uneven wear occurs on the cylinder block. Therefore, lubricating oil LO is used in the internal combustion engine 200 to ensure smooth movement of the piston. The internal combustion engine 200 may also burn a mixture of liquid ammonia and fossil fuels such as natural gas.

[0033] [Lubricating oil discharge pipeline]

[0034] Figure 1 The lubricating oil discharge pipeline 150 shown is a pipeline for transporting the used lubricating oil LO (stock solution DO) in the internal combustion engine 200 to the lubricating oil tank 300. One end of the lubricating oil discharge pipeline 150 is connected to the internal combustion engine 200, and the other end is connected to the lubricating oil tank 300.

[0035] [Lubricating oil tank and lubricating oil]

[0036] As Figure 1 shown, the lubricating oil tank 300 is a tank for storing the stock solution DO containing the used lubricating oil LO in the internal combustion engine 200. The stock solution DO supplied from the internal combustion engine 200 to the lubricating oil tank 300 contains ammonia derived from ammonia fuel. Therefore, the lubricating oil tank 300 is a covered tank that prevents the vaporized ammonia from leaking outside the lubricating oil tank 300.

[0037] In addition, the stock solution DO contains moisture mixed in the internal combustion engine 200. The specific gravity of the stock solution DO is 0.90 - 0.96.

[0038] [Ammonia water and water]

[0039] Ammonia water AW is an alkaline aqueous solution in which ammonia is dissolved in water W. Ammonia water AW has a characteristic pungent odor. Ammonia water AW may cause corrosion of O-rings made of fluororubber and heavy / light liquid impellers made of copper alloy used in the lubricating oil cleaner 1. Therefore, these components are preferably made of corrosion-resistant materials.

[0040] In addition, the specific gravity of ammonia water AW is lighter than that of water. For the specific gravity of ammonia water AW, for example, the specific gravity is 0.9 at a concentration of about 28%, and the specific gravity is 0.88 at a concentration of about 35%. The specific gravity of ammonia water AW changes according to the concentration of ammonia, so the position of the separation interface SB in the separation chamber SZ of the lubricating oil cleaner 1 will move radially. In addition, when treating the stock solution DO mixed with ammonia water AW, it is preferable to intermittently or continuously supply water W into the separation chamber SZ to adjust the specific gravity of ammonia water AW (heavy liquid), thereby controlling the position of the separation interface SB.

[0041] [Stock solution supply pipeline]

[0042] Figure 1 The shown stock solution supply pipeline 130 is a pipeline for supplying the stock solution DO (lubricating oil LO mixed with sludge SG and ammonia water AW) stored in the lubricating oil tank 300 to the lubricating oil cleaner 1. The stock solution supply pipeline 130 is composed of a heater upstream pipeline 131 from the lubricating oil tank 300 to the heater 400 and a heater downstream pipeline 132 from the heater 400 to the lubricating oil cleaner 1. A lubricating oil supply pump P1 is provided in the heater upstream pipeline 131, and a three-way valve 134 is provided in the heater downstream pipeline 132.

[0043] [Lubricating oil supply pump]

[0044] The lubricating oil supply pump P1 is a pump for transporting the stock solution DO in the lubricating oil tank 300 to the lubricating oil cleaner 1 via the heater 400 from the stock solution supply pipeline 130. The lubricating oil supply pump P1 is provided between the lubricating oil tank 300 and the heater 400 in the heater upstream pipeline 131. As Figure 1 shown, ammonia water AW is mixed in the stock solution DO in the heater upstream pipeline 131.

[0045] [Heater]

[0046] The heater 400 is an oil heater for heating the lubricating oil LO to be transported to the lubricating oil cleaner 1. The heater 400 is provided between the lubricating oil supply pump P1 and the lubricating oil cleaner 1 in the stock solution supply pipeline 130. The heater 400 heats the lubricating oil LO to about 90 °C, for example. The heater 400 heats the lubricating oil LO to reduce its viscosity, thereby improving the separation efficiency of solid components and / or moisture in the lubricating oil cleaner 1.

[0047] The stock solution return pipeline 133 is composed of a pipeline that switches the flow of the stock solution when necessary during operating actions such as sludge discharge, alarm occurrence, replacement water / sealing water input, etc. in the lubricating oil cleaner 1.

[0048] [Light liquid discharge pipeline]

[0049] The light liquid discharge pipeline 140 is a flow path for returning the lubricating oil LO (light liquid) purified by the lubricating oil cleaner 1 to the lubricating oil tank 300. The light liquid discharge pipeline 140 is composed of a pipeline from the discharge port of the lubricating oil cleaner 1 to the lubricating oil supply port of the lubricating oil tank 300.

[0050] [Lubricating oil cleaner]

[0051] The lubricating oil cleaner 1 is a device for separating / removing sludge SG (solid component) and ammonia water AW contained in the stock solution DO supplied from the lubricating oil tank 300 from the lubricating oil LO. The lubricating oil cleaner 1 can be, for example, a separating plate type centrifugal separator that separates the stock solution DO into three phases of liquid (light liquid) - liquid (heavy liquid) - solid component by the centrifugal force of a rotating body 3 (refer to Figure 2 ). The lubricating oil cleaner 1 is installed on the ship between the stock solution supply pipeline 130 and the light liquid discharge pipeline 140.

[0052] Next, with reference to Figure 2 and Figure 3 the lubricating oil cleaner 1 composed of a separating plate type centrifugal separator will be further described in detail.

[0053] As Figure 2 and Figure 3 shown, the lubricating oil cleaner 1 is a centrifugal separator (centrifugal sedimentation machine) in which many separating plates 13 made of truncated cone-shaped thin plates are stacked at intervals in the axial direction of the guide cylinder 5 inside the rotating body 3. The lubricating oil cleaner 1 has a mechanism for discharging the sludge SG deposited on the inner wall of the rotating body 3 to the outside by opening and closing the valve cylinder 6. As Figure 3 shown, the lubricating oil cleaner 1 includes a rotating shaft 2, a rotating body 3, a guide cylinder 5, a separation chamber SZ, a valve cylinder 6, a light liquid discharge part 9, and a heavy liquid discharge part 15.

[0054] <Rotating shaft>

[0055] As Figure 2 shown, the rotating shaft 2 has a gear part 2a that meshes with a speed increasing gear 21 rotated by a motor (not shown), and the rotating shaft 2 is rotated by the motor (not shown) via the speed increasing gear 21.

[0056] <Rotating body>

[0057] As Figure 3As shown, the rotating body 3 is a member assembled to the rotating shaft 2 and rotating at high speed about the rotating shaft 2. The rotating body 3 has a shape in which a substantially frustum-shaped portion in the upper half and a large-diameter cylindrical portion in the lower half having a diameter larger than that of the frustum-shaped portion are integrally formed. The rotating body 3 is fixed to the rotating shaft 2.

[0058] <Liquid inlet pipe>

[0059] As Figure 3 shown, the liquid inlet pipe 4 is a pipe body for supplying the stock solution DO (lubricating oil LO used in the internal combustion engine 200) and water W into the inside of the rotating body 3. The liquid inlet pipe 4 is provided at the upper part of the central portion of the rotating body 3. A water supply pipeline 110 and a stock solution supply pipeline 130 (see Figure 2 ) are connected to the upstream side of the liquid inlet pipe 4. In addition, the water W to be supplied to the separation chamber SZ of the lubricating oil cleaner 1 is introduced into the rotating body 3 from the water supply pipeline 110 via the liquid inlet pipe 4.

[0060] <Guide cylinder>

[0061] The guide cylinder 5 is a member for guiding the stock solution DO and water W introduced into the rotating body 3 from the liquid inlet pipe 4 from the lowermost part inside the rotating body 3 to the separation chamber SZ. The guide cylinder 5 is composed of a partial cylinder having a shape with an expanded end and is provided at the central portion inside the rotating body 3.

[0062] <Separation chamber>

[0063] The separation chamber SZ is a chamber for separating the stock solution DO into its respective components by centrifugal force using the specific gravity difference. The separation chamber SZ is composed of a circular space in a cross-sectional view. A number of separation plates 13 are stacked in the separation chamber SZ. The separation chamber SZ has a separation area where the separation plates 13 are stacked and a sludge deposition area at the outermost diameter portion inside the rotating body 3. As the stock solution DO introduced into the separation chamber SZ rises and flows through the gaps between the separation plates 13, the sludge SG with the largest specific gravity deposits in the outer sludge deposition area, the heavy liquid (ammonia water AW or water W) with a specific gravity smaller than that of the sludge SG moves to the area between the sludge deposition area and the separation area, and the light liquid (lubricating oil LO) with the smallest specific gravity moves toward the center side of the rotating body 3. The light liquid (cleaned lubricating oil LO) is discharged to the outside from the light liquid discharge portion 9 provided at the upper part of the rotating body 3. The ammonia water (heavy liquid) AW separated in the separation chamber SZ passes through the flow path formed between the water intake plate TD and the inner wall of the upper part of the rotating body 3 and is discharged to the outside from the heavy liquid discharge portion 15.

[0064] <Valve cylinder>

[0065] The valve cylinder 6 is a valve body that opens and closes the sludge discharge port 12 (the part crimped to the valve gasket 7). When the pilot valve V is opened and the water on the lower side of the valve cylinder 6 is discharged, the valve cylinder 6 descends, so that the sludge discharge port 12 opens, and the sludge SG is discharged.

[0066] <Light liquid discharge section>

[0067] The light liquid discharge section 9 is a part for discharging the lubricating oil LO (light liquid) separated in the separation chamber SZ to the outside. A light liquid discharge pipeline 140 is assembled in the light liquid discharge section 9.

[0068] <Heavy liquid discharge section>

[0069] The heavy liquid discharge section 15 is a part for discharging the ammonia water (heavy liquid) separated in the separation chamber SZ to the outside. A heavy liquid discharge pipeline 120 is assembled in the heavy liquid discharge section 15.

[0070] <Sludge discharge pipeline>

[0071] The sludge discharge pipeline 160 (drainage unit) is a discharge path for discharging the sludge SG centrifugally separated by the lubricating oil cleaner 1 to the outside of the lubricating oil cleaner 1. The upstream side of the sludge discharge pipeline 160 is connected to the sludge discharge port 12, and the downstream side is connected to the sludge tank 700 (refer to Figure 1 ). The sludge SG in the lubricating oil cleaner 1 is discharged to the sludge discharge pipeline 160 and stored in the sludge tank 700 and then discarded.

[0072] <Sludge tank>

[0073] The sludge tank 700 is a tank for storing the waste liquid SW discharged from the lubricating oil cleaner 1. When the waste liquid SW in the sludge tank 700 is 40 °C or higher, a cooling device for cooling the waste liquid SW can also be provided.

[0074] <Water supply pipeline>

[0075] As Figure 3 shown, the water supply pipeline 110 is a water supply unit that supplies water W (sealing water / replacement water) into the separation chamber SZ (inside the rotating body 3) during the operation of the lubricating oil cleaner 1. It should be noted that the water supply pipeline 110 supplies cleaning water into the separation chamber SZ during the maintenance of the lubricating oil cleaner 1. A valve (not shown) for adjusting the supply of water is provided in the water supply pipeline 110 inside the separation chamber SZ (inside the rotating body 3). Alternatively, in the water supply pipeline 110, based on the measurement value of any one of the pressure sensor 810, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 described later, the control valve SV3 is controlled by the control unit 910 and the timer 920, thereby adjusting the supply of water.

[0076] <Heavy liquid discharge pipeline>

[0077] The heavy liquid discharge pipeline 120 (drainage unit) is a flow path for discharging the ammonia water AW (separated water) centrifugally separated by the lubricating oil cleaner 1, and is connected to the heavy liquid discharge part 15 of the lubricating oil cleaner 1. The ammonia water AW (heavy liquid) in the lubricating oil cleaner 1 overflows from the heavy liquid discharge part 15, and thus is discharged to the heavy liquid discharge pipeline 120 and stored in the sludge tank 700 before being discarded. Alternatively, a leakage sensor 840 may be provided in the heavy liquid discharge pipeline 120.

[0078] <Pressure Sensor>

[0079] The pressure sensor 810 is a measuring device for measuring the pressure of the light liquid discharged from the light liquid discharge part 9 of the lubricating oil cleaner 1. The pressure sensor 810 is electrically connected to the control unit 910.

[0080] <Moisture Sensing Sensor>

[0081] The moisture sensing sensor 820 is a measuring device for measuring the moisture content in the light liquid discharged from the light liquid discharge part 9 of the lubricating oil cleaner 1. The moisture sensing sensor 820 is electrically connected to the control unit 910. Depending on the condition of the lubricating oil LO, the moisture sensing sensor 820 may be omitted.

[0082] <Ammonia Sensor>

[0083] The ammonia sensor 830 is a measuring device for measuring the ammonia concentration of the ammonia water AW discharged from the light liquid discharge part 9 of the lubricating oil cleaner 1. The ammonia sensor 830 is electrically connected to the control unit 910. Depending on the condition of the lubricating oil LO, the ammonia sensor 830 may be omitted.

[0084] <Leakage Sensor>

[0085] The leakage sensor 840 is a measuring device for mechanically measuring the heavy liquid discharged from the heavy liquid discharge part 15 of the lubricating oil cleaner 1. The leakage sensor 840 is electrically connected to the control unit 910. Depending on the condition of the lubricating oil LO, the leakage sensor 840 may be omitted.

[0086] <Control Device>

[0087] Figure 3 The shown control device 900 has the following functions: supplying the water W to be supplied to the lubricating oil cleaner 1 at a preset timing or at an arbitrary fixed time interval or continuously, so as to keep the specific gravity of the ammonia water AW (heavy liquid) in the separation chamber SZ above a specified value. The control device 900 is configured to include a control unit 910 and a timer 920. The timer 920, the pressure sensor 810, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 are connected to the control unit 910.

[0088] <Clean Lubricating Oil>

[0089] The cleaned lubricating oil is the lubricating oil LO purified by the lubricating oil cleaner 1. After the cleaned lubricating oil is stored again in the lubricating oil tank 300 via the light liquid discharge line 140 from the lubricating oil cleaner 1, it is supplied to the engine or auxiliary machinery of the ship (for example, generators, boilers, etc.).

[0090] [Function]

[0091] Next, with reference to Figures 1 to 6 , the function of the lubricating oil cleaning system 100 and the lubricating oil cleaning method according to the embodiments of the present invention will be described by comparing with the case where the lubricating oil LO is separated in a normal state.

[0092] For example, as Figure 1 shown, the used lubricating oil LO (stock solution DO) in the internal combustion engine 200 is introduced into the lubricating oil cleaner 1 after being stored in the lubricating oil tank 300. The stock solution DO introduced into the lubricating oil cleaner 1 rises and flows between the stacked plurality of separation plates 13 as Figure 3 shown.

[0093] Figure 4 is a schematic diagram showing the state inside the rotating body 3 when the stock solution DO not containing ammonia water AW is centrifuged by the lubricating oil cleaner 1.

[0094] Normally, as Figure 4 shown, components with a higher specific gravity (sludge SG, water W, etc.) move to the outermost diameter side inside the rotating body 3 and are separated. Components with a lower specific gravity (lubricating oil LO) move to the center side of the rotating body 3 and are separated.

[0095] Figure 5 is a schematic diagram showing the state inside the rotating body 3 when the stock solution DO mixed with ammonia is centrifuged by the lubricating oil cleaner 1.

[0096] Generally, when the stock solution DO mixed with ammonia water AW is supplied into the rotating body 3, as Figure 5 shown, the stock solution DO is separated into lubricating oil LO, ammonia water AW, and sludge SG.

[0097] The specific gravity of ammonia water AW is less than that of water W not containing ammonia. As a result, the specific gravity difference between the light liquid (lubricating oil LO) and the heavy liquid (ammonia water AW) becomes smaller, so the separation efficiency of the light liquid (lubricating oil LO) and the heavy liquid (ammonia water AW) may be reduced. In addition, the separation interface SB between ammonia water AW and lubricating oil LO is pressed by the lubricating oil LO and moves outward. Therefore, if the ammonia concentration of ammonia water AW becomes high (for example, if the ammonia concentration exceeds 6 wt%), during three-phase separation (when the purifier is operating), the light liquid may leak (the light liquid may flow out to the heavy liquid discharge line 120).

[0098] In addition, when the concentration of ammonia water AW is high, the specific gravity difference between the light liquid and the heavy liquid becomes small. Therefore, the water W retained in the rotating body 3 cannot position the separation interface SB at an ideal position.

[0099] Figure 6 It is a diagram showing a lubricating oil cleaning method according to an embodiment of the present invention, and is a schematic diagram showing the state inside the rotating body 3 when replacement water is introduced into the lubricating oil LO mixed with ammonia and centrifuged by the lubricating oil cleaner 1.

[0100] In the present embodiment, in the step of centrifuging the raw water DO mixed with ammonia water AW (centrifugation step), by supplying water to the separation chamber SZ (water supply step), the specific gravity of the ammonia water AW in the separation chamber SZ can be restored to a value equal to or higher than a specified value. Thus, by introducing water W into the separation chamber SZ, the specific gravity of the ammonia water AW can be maintained at a value equal to or higher than a fixed value. Therefore, the loss of the lubricating oil LO (the light liquid flowing out to the heavy liquid discharge section 15) can be minimized, and stable normal operation can thus be achieved.

[0101] The water supply step can be performed intermittently by Figure 3 the timer 920 and the control device 900 shown, or can be performed continuously. In addition, it can also be performed when the measured value of at least one of the pressure sensor 810, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 reaches a threshold value. By setting it in this way, the specific gravity of the ammonia water AW can be maintained at a value equal to or higher than a specified value (that is, the specific gravity difference between the ammonia water AW and the lubricating oil LO in the separation chamber SZ can be maintained at a value equal to or higher than a specified value).

[0102] In the discharge step, the discharge of the ammonia water AW and the sludge SG can also be performed at fixed intervals by the timer 920 and the control device 900 or when the measured value of at least one of the pressure sensor 810, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 reaches a threshold value. It should be noted that the discharge step and the water supply step are not performed simultaneously, but only one of them is performed.

[0103] As described above, according to the present embodiment, the raw water DO mixed with ammonia can be separated into ammonia water AW, lubricating oil LO, and sludge SG, thereby obtaining the purified lubricating oil LO.

[0104] The first embodiment of the present invention is, for example, as Figure 1 or Figure 3As shown, there is a lubricating oil cleaning system 100 that can clean the stock solution DO mixed with ammonia water AW into lubricating oil LO. The lubricating oil cleaning system 100 includes: an internal combustion engine 200; a lubricating oil cleaner 1 that separates the stock solution DO containing the used lubricating oil LO in the internal combustion engine 200 into at least a light liquid as the purified lubricating oil LO and a heavy liquid containing ammonia; and a water supply unit (water supply pipeline 110) that supplies water W into the separation chamber SZ during the operation of the lubricating oil cleaner 1.

[0105] With such a configuration, the lubricating oil cleaner 1 can separate the lubricating oil LO, sludge SG, and ammonia water AW from the stock solution DO.

[0106] In addition, through the water supply unit (water supply pipeline 110) that supplies water W to the separation chamber SZ of the operating lubricating oil cleaner 1, the specific gravity difference between the light liquid (lubricating oil LO) and the heavy liquid (ammonia water AW) in the separation chamber SZ can be made suitable for sedimentation separation, so it plays the role of enabling stable normal operation.

[0107] Moreover, it can prevent the separation interface SB between the ammonia water AW and the lubricating oil LO in the separation chamber SZ from forming outside the water intake plate TD, so the lubricating oil LO can be stably separated from the stock solution DO containing ammonia water AW and the like discharged to the lubricating oil cleaner 1.

[0108] In addition, the lubricating oil cleaning system 100 includes a drainage unit (heavy liquid discharge pipeline 120) that discharges the heavy liquid outside the separation chamber SZ.

[0109] With such a configuration, the lubricating oil cleaning system 100 has a heavy liquid discharge pipeline 120. Thus, if the heavy liquid accumulates more than a specified amount in the lubricating oil cleaner 1, the heavy liquid can be discharged outside the lubricating oil cleaner 1 through overflow.

[0110] In addition, as Figure 3 shown, the lubricating oil cleaning system 100 includes a pressure sensor 810 that detects the pressure of the light liquid discharged from the light liquid discharge part 9 of the lubricating oil cleaner 1.

[0111] With such a configuration, by using the pressure sensor 810 to detect the pressure of the light liquid discharged from the light liquid discharge part 9, an appropriate amount of water W can be supplied to the lubricating oil cleaner 1 according to the pressure of the light liquid in the lubricating oil cleaner 1.

[0112] In addition, as Figure 3 shown, the lubricating oil cleaning system 100 includes a moisture sensing sensor 820 that detects the moisture content in the light liquid discharged from the light liquid discharge part 9 of the lubricating oil cleaner 1.

[0113] With such a configuration, water W can be supplied to the lubricating oil cleaner 1 according to the amount of water in the light liquid discharged from the light liquid discharge section 9.

[0114] In addition, as Figure 3 shown, the lubricating oil cleaning system 100 includes: an ammonia sensor 830 that detects the ammonia concentration of the light liquid (lubricating oil LO) discharged from the light liquid discharge section 9 of the lubricating oil cleaner 1.

[0115] With such a configuration, water W can be supplied to the lubricating oil cleaner 1 according to the ammonia concentration of the ammonia water AW.

[0116] In addition, as Figure 3 shown, the lubricating oil cleaning system 100 includes: a leakage sensor 840 that senses the leakage of the heavy liquid in which the light liquid is discharged from the heavy liquid discharge section 15 of the lubricating oil cleaner 1.

[0117] With such a configuration, the leakage of the light liquid is sensed by the leakage sensor 840, and water is supplied according to the leakage amount of the light liquid, whereby the lubricating oil cleaner 1 can be operated in a stable state.

[0118] In addition, as Figure 1 shown, the lubricating oil cleaning system 100 includes: a lubricating oil tank 300 that stores the stock solution DO; a separator inlet pipeline (stock solution supply pipeline 130) for supplying the stock solution DO in the lubricating oil tank 300 to the lubricating oil cleaner 1; and a light liquid discharge pipeline 140 for allowing the light liquid (lubricating oil LO) to flow out of the lubricating oil cleaner 1 and return to the lubricating oil tank 300. In the separator inlet pipeline (stock solution supply pipeline 130), there are provided: a lubricating oil supply pump P1 for transporting the stock solution DO stored in the lubricating oil tank 300 to the lubricating oil cleaner 1; a heater 400 for heating the lubricating oil LO transported to the lubricating oil cleaner 1; and a three-way valve 134.

[0119] With such a configuration, the stock solution DO (lubricating oil LO) can be heated by the heater 400 to reduce its viscosity, and thus the separation efficiency of the solid components and water in the lubricating oil cleaner 1 can be improved.

[0120] In addition, Figures 1 to 3 the lubricating oil cleaner 1 shown is a separator plate type centrifuge.

[0121] With such a configuration, since the lubricating oil cleaner 1 is a separator plate type centrifuge, it can be small in size while exhibiting high separation performance, and the lubricating oil can be purified in a short time.

[0122] In addition, as Figure 1 or Figure 3As shown, a lubricating oil cleaning method is provided, which can clean the stock solution DO mixed with ammonia water AW into lubricating oil LO. The lubricating oil cleaning method includes: a centrifugal separation process, in which the stock solution DO mixed with ammonia water AW in the used lubricating oil LO in the internal combustion engine 200 is separated by the lubricating oil cleaner 1 into at least a light liquid as the purified lubricating oil LO and a heavy liquid containing ammonia; and a water supply process, in which water W is supplied into the separation chamber SZ during the operation of the lubricating oil cleaner 1. The lubricating oil cleaning method can purify the stock solution DO mixed with ammonia water AW and perform stable normal operation.

[0123] According to such a lubricating oil cleaning method, the stock solution DO mixed with ammonia water AW is separated into ammonia water AW, lubricating oil LO, and sludge SG. Water is supplied before the specific gravity difference between the light liquid and the heavy liquid becomes small or when the light liquid flows out to the heavy liquid discharge pipeline 120. Therefore, the specific gravity of ammonia water AW in the separation chamber SZ can be adjusted so as to be above a specified value. Thereby, the specific gravity difference between the light liquid (lubricating oil LO) and the heavy liquid (ammonia water AW) in the separation chamber SZ can be maintained at a size suitable for sedimentation separation, and moreover, the separation interface SB between ammonia water AW and lubricating oil LO can be in a desired position state. Therefore, the loss of lubricating oil LO can be suppressed, and lubricating oil LO with few impurities can be generated. That is to say, it is a lubricating oil cleaning system that can stably clean the stock solution DO containing ammonia water AW and the like into lubricating oil LO according to the above-mentioned lubricating oil cleaning method.

[0124] [Variant Example]

[0125] It should be noted that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of its technical idea. Of course, the present invention also includes the technical solutions after these modifications and changes. It should be noted that the same reference numerals are used for the components that have been described and their descriptions are omitted.

[0126] Figure 7 It is a block diagram showing a variant example of the lubricating oil cleaning system and the lubricating oil cleaning method according to the embodiment of the present invention.

[0127] As Figure 7 shown, the lubricating oil cleaning system 100 may also include: a waste liquid tank 500 that stores at least waste liquid SW; and a neutralization tank 600 that stores a neutralizing agent CA, and the neutralizing agent CA neutralizes the waste liquid SW (separated water) stored in the waste liquid tank 500.

[0128] According to such a configuration, the neutralizing agent CA in the neutralization tank 600 is supplied to the waste liquid SW (separated water) in the waste liquid tank 500, thereby making the waste liquid SW harmless.

[0129] <Neutralization Tank>

[0130] The neutralization tank 600 is a tank for storing the neutralizing agent CA that neutralizes the mixture of sludge SG and ammonia water AW (hereinafter referred to as waste liquid SW) stored in the waste liquid tank 500. A neutralizing agent supply pipeline 170 for supplying the neutralizing agent CA in the neutralization tank 600 to the waste liquid tank 500 is arranged in the neutralization tank 600.

[0131] <Neutralizing agent>

[0132] The neutralizing agent CA is an acidic neutralizing agent for neutralizing the waste liquid SW in the waste liquid tank 500 and is composed of, for example, citric acid, etc. For the neutralizing agent CA, the neutralizing agent CA input into the sewage SW in the waste liquid tank 500 is composed of a solid or a liquid.

[0133] <Waste liquid tank>

[0134] Figure 7 The shown waste liquid tank 500 is a tank for storing the waste liquid SW containing sludge SG separated by the lubricating oil cleaner 1. The waste liquid tank 500 is arranged on the downstream side of the sludge discharge pipeline 160 for supplying the sludge SG separated by the lubricating oil cleaner 1 to the waste liquid tank 500.

[0135] The waste liquid SW containing sludge SG is deposited on the outermost diameter part side in the rotating body 3 by the centrifugal force of the lubricating oil cleaner 1. After being discharged from the sludge discharge port 12 through the sludge discharge pipeline 160 to the waste liquid tank 500, it is stored in the sludge tank 700 through the waste liquid discharge pipeline 180.

[0136] In this embodiment, the ammonia water AW (heavy liquid) separated by the lubricating oil cleaner 1 is also stored in the waste liquid tank 500. As Figure 3 shown, the heavy liquid discharge part 15 as the discharge port of the ammonia water AW is connected to the sludge discharge pipeline 160.

[0137] It should be noted that a degassing member for removing the vaporized ammonia and a deodorizing device for eliminating the odor of ammonia can also be provided in the waste liquid tank 500.

[0138] [Other modification examples]

[0139] In the above embodiment, as Figure 1 shown, the case of only arranging one lubricating oil cleaner 1 is described, but it can also be configured to arrange a plurality of lubricating oil cleaners 1 side by side.

[0140] In the above embodiment, the case of connecting the water supply pipeline 110 (water supply unit) to the liquid inlet pipe 4 is exemplified, but the water supply pipeline 110 (water supply unit) can also be connected to the lubricating oil tank 300, and the water supply pipeline 110 (water supply unit) can also be connected to the stock solution supply pipeline 130.

[0141] In the described embodiment, an example is shown where the lubricating oil cleaner 1 is a separator plate type centrifugal separator of a three-phase separation type, but a separator plate type centrifugal separator of a two-phase separation type may also be used. In this case, the lubricating oil cleaner 1 separates the stock solution DO of the lubricating oil LO mixed with ammonia water AW into the sludge SG containing the heavy liquid and the light liquid which is the purified lubricating oil LO, and the heavy liquid contains ammonia water AW.

[0142] When using a separator plate type centrifugal separator of a two-phase separation type as the lubricating oil cleaner 1, it is preferable that discharge is performed when the measured value of any one of the pressure sensor 810, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 in the lubricating oil cleaner 1 reaches the threshold value.

[0143] It should be noted that, depending on the condition of the lubricating oil LO, the moisture sensing sensor 820, the ammonia sensor 830, and the leakage sensor 840 may also be omitted.

Claims

1. A lubricating oil cleaning system capable of converting a raw liquid mixed with ammonia water into lubricating oil, the lubricating oil cleaning system comprising: internal combustion engine; a lubricating oil cleaner for separating a raw liquid containing the lubricating oil used in the internal combustion engine into at least a light liquid serving as the purified lubricating oil and a heavy liquid containing ammonia; as well as The water supply unit supplies water into the separation chamber during the operation of the lubricating oil cleaner.

2. The lubricating oil cleaning system according to claim 1, comprising: The drainage unit discharges the heavy liquid out of the separation chamber.

3. The lubricating oil cleaning system according to claim 1, comprising: A pressure sensor detects the pressure of the light liquid discharged from the light liquid discharge portion of the lubricating oil cleaner.

4. The lubricating oil cleaning system according to claim 1, comprising: The moisture sensing sensor detects the amount of moisture in the light liquid discharged from the light liquid discharge portion of the lubricating oil cleaner.

5. The lubricating oil cleaning system according to claim 1, comprising: An ammonia sensor detects an ammonia concentration of the light liquid discharged from the light liquid discharge portion of the lubricating oil cleaner.

6. The lubricating oil cleaning system according to claim 1, comprising: A leakage sensor senses leakage of light liquid from the heavy liquid discharged from the heavy liquid discharge portion of the lubricating oil cleaner.

7. The lubricating oil cleaning system according to claim 1, comprising: a lubricating oil tank for storing the original liquid; a separator inlet pipeline for supplying the raw liquid in the lubricating oil tank to the lubricating oil cleaner; and a light liquid discharge pipeline, for allowing the light liquid to flow out of the lubricating oil cleaner and return to the lubricating oil tank; The separator inlet pipeline is provided with: a lubricating oil supply pump for delivering the raw liquid stored in the lubricating oil tank to the lubricating oil cleaner; and A heater heats the lubricating oil to be fed to the lubricating oil cleaner.

8. The lubricating oil cleaning system according to claim 1, wherein: The lubricating oil cleaner is a separation plate type centrifugal separator.

9. A lubricating oil cleaning method for converting a raw liquid mixed with ammonia water into lubricating oil, the lubricating oil cleaning method comprising: a centrifugal separation step of separating, by a lubricating oil cleaner, a raw liquid containing the lubricating oil used in the internal combustion engine into at least a light liquid serving as the purified lubricating oil and a heavy liquid containing ammonia; as well as The water supply step supplies water into the separation chamber during the operation of the lubricating oil cleaner.

Images