Working water discharge device and lubricating oil cleaning system

Abstract

A purifier (1) having a rotating body (3) that separates raw DO into heavy liquid and light liquid, and a rotating body frame (3A) that houses the rotating body (3), wherein the rotating body (3) is equipped with a sludge outlet (12) for discharging sludge accumulated inside and a valve cylinder (6) for opening and closing the sludge outlet (12), and an operating water discharge device (200) installed on the rotating body frame (3A) for discharging operating water (WW) that operates the valve cylinder (6) to a tank, comprising a sealed container (210) that is airtightly separated from the outside and stores the operating water inside, a piping section (220) that connects the operating water outlet (3a) provided on the rotating body frame (3A) to the sealed container (210) and has its lower end located inside the sealed container (210), and an overflow pipe (230) that discharges from the sealed container (210).

Description

Technical Field

[0001] The present invention relates to a discharge device for discharging working water when cleaning lubricating oil containing ammonia or the like, and a lubricating oil cleaning system.

Background Art

[0002] As a measure to promote the fight against global warming, ammonia fuel that does not emit carbon dioxide, a greenhouse gas, during combustion has attracted attention as a promising energy for realizing a carbon-neutral society. In recent years, the practical application of ammonia gas turbine engines and ammonia-compatible engine engines that can operate using liquid ammonia as fuel has been promoted. In addition, as a device using liquid ammonia as fuel, development for the operation of ammonia fuel ships as so-called zero-emission ships has also been promoted (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When liquid ammonia is used in engines such as ship engines, unburned ammonia gas may mix with the lubricating oil or dissolve in the water in the lubricating oil. The used lubricating oil concentrate is separated into heavy liquid and light liquid (lubricating oil) in a lubricating oil purifier. The lubricating oil purifier is equipped with a rotating body that separates the concentrate into heavy liquid and light liquid. The separated heavy liquid and light liquid are discharged from their respective discharge lines, but sludge, which is a solid component, also accumulates inside the rotating body, so a sludge discharge port is provided on the rotating body to discharge the accumulated sludge. The sludge discharge port is opened and closed by supplying working water to the lower part of the valve cylinder inside the rotating body or by discharging working water from the lower part of the valve cylinder, which moves the valve cylinder up and down. When the working water is discharged to lower the valve cylinder, it is discharged from a discharge port located at the bottom of the frame, and when the valve cylinder is raised again, new working water is supplied from the working water supply port. The working water discharged from the discharge port flows into the hopper and is sent to the sludge tank via piping located at the bottom of the hopper.

[0005] By the way, when separating the undiluted lubricant with a lubricant purifier, sludge accumulated inside the rotating body is also discharged. However, when the sludge is discharged, gaseous ammonia and ammonia water may mix into the space inside the frame, so there is a risk that the working water will be discharged as water contaminated with ammonia. In conventional hydraulic water discharge systems, the hydraulic water is released into the atmosphere when it flows from the discharge port into the hopper, which poses a risk of ammonia gas leaking outside the lubricating oil purifier.

[0006] Therefore, one might consider connecting the piping between the working water outlet and the sludge tank in a sealed state. However, since negative pressure can occur inside the frame, a new problem arises: there is a risk that sludge from the sludge tank may backflow and enter the frame.

[0007] The present invention aims to solve the aforementioned problems and provide a working water discharge device and a lubricating oil cleaning system that can prevent gases contained in the raw liquid from leaking into the atmosphere and prevent sludge from flowing back into the frame. [Means for solving the problem]

[0008] To solve the aforementioned problems, the present invention provides a purifier having a rotating body for separating a raw liquid into a heavy liquid and a light liquid, and a rotating body frame for housing the rotating body, wherein the rotating body is equipped with a sludge outlet for discharging sludge accumulated inside it, and a valve cylinder for opening and closing the sludge outlet, and the working water for operating the valve cylinder , separated from the outside in an airtight manner In a working water discharge device installed on the rotating frame for discharging to a tank, a sealed container that is airtightly separated from the outside and stores the working water inside, and a discharge port for the working water provided on the rotating frame and the sealed container are In an airtight state A piping section which is connected and whose lower end is located inside the seal container, and an overflow pipe which discharges the working water from the seal container, The overflow pipe is provided to connect the seal container and the tank in an airtight manner. It is characterized by the following: Furthermore, the present invention relates to a lubricating oil purification system capable of purifying a raw liquid contaminated with ammonia into lubricating oil, comprising: an engine; a purifier having a rotating body that separates a raw liquid containing the lubricating oil used in the engine into a light liquid which is the purified lubricating oil and a heavy liquid which contains ammonia; and a working water discharge device that discharges working water, which operates a valve cylinder for opening and closing a sludge discharge port for discharging sludge accumulated in the purifier, from within a rotating body frame housing the rotating body into a tank, wherein the heavy liquid is discharged into the tank, and the working water discharge device is characterized by comprising: a sealed container that is airtightly partitioned from the outside and stores the working water inside; a piping section that airtightly connects the working water discharge port provided on the rotating body frame to the sealed container, with its lower end located inside the sealed container; and an overflow pipe whose upstream side is connected to a position higher than the lower end of the piping section within the sealed container, and whose downstream side is airtightly connected to the tank. [Effects of the Invention]

[0009] According to the working water discharge device and lubricating oil cleaning system of the present invention, it is possible to prevent gases contained in the raw liquid from leaking into the atmosphere and to prevent sludge from flowing back into the frame. [Brief explanation of the drawing]

[0010] [Figure 1] This is a block diagram showing a lubricating oil cleaning system according to an embodiment of the present invention. [Figure 2] This is a partial cross-sectional view showing a lubricating oil cleaner. [Figure 3A] This is an enlarged view of the main components of the working water discharge device. [Figure 3B] This is an enlarged view of the main part of the working water discharge device according to a modified example. [Figure 4A] This is a cross-sectional view showing the sludge discharge port of the lubricating oil cleaner in a closed state. [Figure 4B] This is a cross-sectional view showing the sludge discharge port of the lubricating oil cleaner in the open position. [Modes for carrying out the invention]

[0011] A lubricating oil cleaning system 100 and a working water discharge device 200 according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 4. In this embodiment, the working water discharge device is applied to the lubricating oil cleaning system. First, the lubricating oil cleaning system will be described.

[0012] ≪Lubricant Cleaning System≫ The lubricating oil cleaning system 100 shown in Figure 1 is a system that can purify a raw liquid contaminated with ammonia into lubricating oil, and is a purifier for cleaning and reusing lubricating oil LO (see Figures 4A and 4B), fuel oil, bilge water, etc. used in engines 300 etc. installed in ships, limited onshore spaces (for example, island power plants or existing power plants, etc.). The following explanation will use as an example the case in which the lubricating oil cleaning system 100 is used in an engine 300 that burns liquid ammonia as fuel, and the target liquid for cleaning (undiluted DO) is used. In an engine 300 using liquid ammonia as fuel, there is a possibility that a stock solution DO in which sludge SG, ammonia, aqueous ammonia AW, etc. are mixed into the lubricating oil LO in the engine 300 may be discharged.

[0013] The lubricating oil cleaning system 100 includes an engine 300 and a lubricating oil cleaner 1 as shown in FIGS. 1 and 4. The lubricating oil cleaner 1 separates a stock solution DO containing a lubricating oil LO mixed with aqueous ammonia AW into a light liquid which is the purified lubricating oil LO, a heavy liquid which is aqueous ammonia AW containing ammonia, and sludge SG (solid content). The lubricating oil cleaner 1 is composed of, for example, a three-phase separation type separating plate centrifuge. More specifically, as shown in FIG. 1 or FIG. 4, the lubricating oil cleaning system 100 mainly includes a lubricating oil tank 350, a lubricating oil supply pump P1, a heater 400, a lubricating oil cleaner 1, a sludge tank 700, a water supply line 110 (water supply means), a heavy liquid discharge line 120 (drainage means), a separator inlet line 130, a sludge discharge line 160, a working water discharge device 200, and a control device 900. The lubricating oil cleaning system 100 is arranged inside a ship. In the lubricating oil cleaning system 100, a path for supplying the stock solution DO discharged from the engine 300 to the lubricating oil cleaner 1 is formed by the lubricating oil discharge line 150, the lubricating oil tank 350, and the separator inlet line 130. Note that a pressure sensor 810, a moisture detection sensor 820, and an ammonia sensor 830 may be arranged in the light liquid discharge line 140.

[0014] ≪Engine≫ The engine 300 shown in Fig. 1 is a marine diesel engine arranged inside a ship, which uses liquid ammonia, a greenhouse gas with zero carbon dioxide emissions, as fuel, and may also be a turbine engine. The engine 300 consists of a mechanism that connects the crankshaft and the piston only with a connecting rod. In the engine 300, side pressure, which is a lateral force, is generated on the piston, causing uneven wear on the cylinder. Therefore, lubricating oil LO is used in the engine 300 to improve the movement of the piston. The engine 300 may also co-fire liquid ammonia and fossil fuels such as natural gas.

[0015] ≪Lubricating Oil Drain Line≫ The lubricating oil drain line 150 shown in Fig. 1 is a pipeline for sending the lubricating oil LO (stock solution DO) used in the engine 300 to the lubricating oil tank 350. One end of the lubricating oil drain line 150 is connected to the engine 300, and the other end is connected to the lubricating oil tank 350.

[0016] ≪Lubricating Oil Tank and Lubricating Oil≫ As shown in Fig. 1, the lubricating oil tank 350 is a tank for storing the stock solution DO containing the lubricating oil LO used in the engine 300. The stock solution DO supplied from the engine 300 to the lubricating oil tank 350 contains ammonia derived from ammonia fuel. Therefore, the lubricating oil tank 350 consists of a tank with a lid (a sealed tank) that prevents the ammonia vaporized from the stock solution DO from leaking outside the lubricating oil tank 350. Also, the stock solution DO contains aqueous ammonia AW mixed in the engine 300. The specific gravity of the stock solution DO is 0.90 - 0.96.

[0017] ≪Stock Solution Supply Line≫ The separator inlet line 130 shown in Figure 1 is a piping system for supplying the raw DO (sludge SG, ammonia water AW, and lubricating oil LO mixed with ammonia) stored in the lubricating oil tank 350 to the lubricating oil purifier 1. The separator inlet line 130 consists of a heater upstream line 131 from the lubricating oil tank 350 to the heater 400, and a heater downstream line 132 from the heater 400 to the lubricating oil purifier 1. A lubricating oil supply pump P1 is provided in the heater upstream line 131. A three-way valve 134 is provided in the heater downstream line 132. The switching of the three-way valve 134 is controlled by a control device 900. Furthermore, as shown in Figures 4A and 4B, a water storage tank 139, a water supply line 136, an additive means 135, and a mixing means 137 may be installed in the separator inlet line 130.

[0018] <Water storage tanks and water supply lines> As shown in Figures 4A and 4B, the water storage tank 139 is a tank for storing water W to be supplied to the additive means 135. The water storage tank 139 is connected to the additive means 135 via the water supply line 136. Furthermore, as shown in Figures 4A and 4B, the additive means 135 may be connected to the water supply line 110 instead of the water storage tank 139 and the water supply line 136, so that the water is supplied from the water supply line 110.

[0019] ≪Addition means≫ The additive means 135 is a device for adding water W to the raw DO in the separator inlet line 130. The additive means 135 consists of, for example, a nozzle connected to the separator inlet line 130. The additive means 135 is installed downstream of the heater 400 in the separator inlet line 130. The raw DO in the heater downstream line 132, downstream of the additive means 135, contains ammonia water AW, ammonia, water W added from the additive means 135, etc. A mixing means 137 is provided downstream of the additive means 135 in the separator inlet line 130. The additive means 135 may also serve as a mixing means for water W and raw DO.

[0020] ≪Mixing means≫ The mixing means 137 is a mixer for mixing the raw DO in the separator inlet line 130 with the water W added by the additive means 135. The mixing means 137 consists of a static mixer installed in the separator inlet line 130. The static mixer promotes the generation of ammonia water AW by disturbing the flow of liquid in the piping, thereby bringing the ammonia contained in the raw DO into contact with the water W added by the additive means 135. It consists of piping that incorporates stirring elements and impellers for dividing, reversing, and rotating the fluid.

[0021] Lubrication oil supply pump The lubricating oil supply pump P1 is a pump that sends the undiluted DO in the lubricating oil tank 350 to the lubricating oil purifier 1 via the separator inlet line 130. As shown in Figure 1, the lubricating oil supply pump P1 is installed between the lubricating oil tank 350 and the heater 400 in the heater upstream line 131, and the undiluted DO in the lubricating oil tank 350 is supplied to the lubricating oil purifier 1 via the heater 400 and the three-way valve 134. As shown in Figure 1, the undiluted DO in the heater upstream line 131 contains ammonia water AW and ammonia.

[0022] Heater The heater 400 is an oil heater that heats the lubricating oil LO (undiluted DO) sent to the lubricating oil purifier 1. As shown in Figure 1, the heater 400 is installed between the lubricating oil supply pump P1 and the three-way valve 134 in the separator inlet line 130. The heater 400 heats the lubricating oil LO to approximately 90°C, for example. By heating the lubricating oil LO and lowering its viscosity, the heater 400 can improve the separation efficiency of solids, water, or both of the water in the lubricating oil purifier 1.

[0023] <<Return line for undiluted solution and three-way valve>> The undiluted fluid return line 133 is a piping route for returning the undiluted DO in the separator inlet line 130 to the lubricating oil tank 350. The undiluted fluid return line 133 can return the flow of undiluted DO to the lubricating oil tank 350 by switching the three-way valve 134 when necessary for operation of the lubricating oil purifier 1, such as when sludge is discharged, when an alarm is triggered, or when displacement water / seal water is added.

[0024] <<Light liquid discharge line>> As shown in Figure 1, the light liquid discharge line 140 is a flow path for returning the lubricating oil LO (light liquid) purified by the lubricating oil purifier 1 back to the lubricating oil tank 350. The light liquid discharge line 140 consists of a piping route from the discharge port of the lubricating oil purifier 1 to the lubricating oil supply port of the lubricating oil tank 350.

[0025] Lubricant Cleaner The lubricating oil purifier 1 is a device for separating / removing sludge SG (solids) and ammonia water AW contained in the raw DO supplied from the lubricating oil tank 350 from the lubricating oil LO. The lubricating oil purifier 1 may also be a separator plate type centrifuge that separates the raw DO into three phases of liquid (light liquid) - liquid (heavy liquid) - solids by the centrifugal force of a rotating body 3 (see Figure 2) that rotates at high speed. Onboard the ship, the lubricating oil purifier 1 is connected to a separator inlet line 130 and a light liquid discharge line 140.

[0026] Next, the lubricating oil purifier 1, which consists of a separation plate type centrifugal separator, will be described in more detail with reference to Figures 2 to 4. As shown in Figures 4A and 4B, the lubricating oil cleaner 1 is a centrifugal separator (centrifugal sedimentation machine) in which numerous separation plates 13 made of truncated cone-shaped thin plates are stacked at intervals in the axial direction of the guide cylinder 5 inside a rotating body 3. The lubricating oil cleaner 1 has a mechanism for discharging sludge SG accumulated on the inner wall of the rotating body 3 to the outside by opening and closing a valve cylinder 6. The lubricating oil cleaner 1 comprises a rotating shaft 2, a rotating body 3, a guide cylinder 5, a separation chamber SZ, a valve cylinder 6, a light liquid discharge section 9 (see Figure 2), and a heavy liquid discharge section 15.

[0027] <Rotation axis> As shown in Figure 2, the rotating shaft 2 has a gear portion 2a that meshes with a speed-increasing gear 21 which is rotationally driven by an electric motor (not shown), and is rotated by the electric motor (not shown) via the speed-increasing gear 21.

[0028] <Rotating body> As shown in Figures 4A and 4B, the rotating body 3 is a component attached to the rotating shaft 2 and rotates at high speed around the rotating shaft 2, separating the raw DO into heavy liquid and light liquid. The rotating body 3 has a shape in which the upper half is a roughly truncated cone-shaped section and the lower half is a large-diameter cylindrical section with a diameter larger than the large diameter of the truncated cone-shaped section, formed integrally. The rotating body 3 is housed in a rotating body frame 3A and fixed to the rotating shaft 2. The rotating body frame 3A has a sludge outlet 12 formed therein for discharging sludge accumulated inside.

[0029] <Liquid inlet pipe> As shown in Figures 4A and 4B, the liquid inlet pipe 4 is a pipe for supplying the raw liquid DO (lubricating oil LO used in engine 300) and water W into the rotating body 3. The liquid inlet pipe 4 is located at the top of the center of the rotating body 3. Alternatively, a water supply line 110 and a separator inlet line 130 (see Figure 2) can be connected to the upstream side of the liquid inlet pipe 4, and water W can be introduced into the rotating body 3 from the water supply line 110 to adjust the specific gravity of the ammonia water AW (heavy liquid) and facilitate the separation of the light liquid and heavy liquid.

[0030] <Information tube> As shown in Figures 4A and 4B, the guide tube 5 is a component that guides the raw liquid DO and water W introduced into the rotating body 3 from the liquid inlet pipe 4 to the separation chamber SZ from the bottom of the rotating body 3. The guide tube 5 consists of a flared cylindrical body and is located in the center of the rotating body 3.

[0031] <Separation room> As shown in Figures 4A and 4B, the separation chamber SZ is a separation chamber formed inside the rotating body 3 to separate the raw DO liquid, which has been subjected to centrifugal force, into its components based on differences in specific gravity. The separation chamber SZ consists of a circular space when viewed in cross-section. Multiple stacked separation plates 13 are arranged in the separation chamber SZ. The separation chamber SZ comprises a separation region where the stacked separation plates 13 are arranged to separate the light liquid and the heavy liquid, and an outer sludge accumulation region. As the raw DO liquid introduced into the separation chamber SZ flows upward through the gaps between the separation plates 13, the sludge SG with the highest specific gravity accumulates in the outer sludge accumulation region, the heavy liquid (ammonia water AW or water W) with a lower specific gravity than sludge SG moves to the region between the sludge accumulation region and the separation region, and the light liquid (lubricating oil LO) with the lowest specific gravity moves towards the center of the rotating body 3. The light liquid (purified lubricating oil LO) is discharged to the outside from the light liquid discharge section 9 (see Figure 2) provided at the top of the rotating body 3. The ammonia water (heavy liquid) AW separated in the separation chamber SZ is discharged to the outside through the heavy liquid discharge line 120 and leak detector 840 from the heavy liquid discharge section 15 formed between the water intake plate TD and the inner wall of the upper part of the rotating body 3.

[0032] <Valve Cylinder> The valve cylinder 6 is a valve body that opens and closes the sludge discharge port 12 (the part that is in contact with the valve packing 7). As shown in Figure 4A, when working water WW is supplied from the working water supply port 61 located below the valve cylinder 6, the working water WW flows into the lower part 62 of the valve cylinder, causing the valve cylinder 6 to rise. Then, the upper end 6a of the valve cylinder 6 is pressed against the valve packing 7, and the sludge discharge port 12 closes. As shown in Figure 4B, when the pilot valve (not shown) is opened to drain the water in the lower part 62 of the valve cylinder 6, the valve cylinder 6 descends, and the upper end 6a of the valve cylinder 6 separates from the valve packing 7. As a result, the sludge outlet 12 opens, and the sludge SG is discharged.

[0033] <Light liquid discharge section> As shown in Figure 2, 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 line 140 is attached to the light liquid discharge section 9.

[0034] <Heavy liquid discharge part> As shown in Figure 2, the heavy liquid discharge section 15 is the part that discharges the ammonia water (heavy liquid) separated in the separation chamber SZ to the outside. A heavy liquid discharge line 120 is attached to the heavy liquid discharge section 15.

[0035] <Sludge discharge line> As shown in Figures 4A and 4B, the sludge discharge line (sludge discharge means) 160 is a discharge path for discharging sludge SG, which has been centrifuged in the lubricating oil purifier 1, to the outside of the lubricating oil purifier 1. The sludge discharge line 160 is connected to the sludge outlet 12 on its upstream side and to the sludge tank 700 on its downstream side (see Figure 1). The sludge SG in the lubricating oil purifier 1 is discharged into the sludge discharge line 160, stored in the sludge tank 700, and then discarded. An on-off valve 165 is provided at the upper end of the sludge discharge line 160 (see Figure 2). The on-off valve 165 is closed when the lubricating oil cleaner 1 is stopped, thereby separating the rotating body 3 from the sludge tank 700. Alternatively, instead of an on-off valve, air may be flowed in a direction intersecting the sludge discharge line to form an air film, thereby separating the rotating body 3 from the sludge tank 700.

[0036] <Sludge Tank> The sludge tank 700 is a tank for storing waste liquid SW (ammonia water AW and sludge SG) discharged from the lubricating oil purifier 1. A vent 710 is provided at the top of the sludge tank 700 to discharge ammonia gas and other vapors from the waste liquid SW to the outside of the sludge tank 700. If the waste liquid SW in the sludge tank 700 is 40°C or higher, a cooling device may be installed to cool the waste liquid SW.

[0037] <Working water discharge device>

[0038] As shown in Figure 2, the working water discharge device 200 is a discharge passage that discharges the working water WW supplied to the lower part 62 of the valve cylinder and the cleaning water injected into the rotating frame 3A of the lubricating oil purifier 1. The upstream side is connected to the rotating frame 3A of the lubricating oil purifier 1, and the downstream side is connected to the sludge tank 700 or another storage tank. As shown in Figures 2 and 3A, the working water discharge device 200 includes a seal container 210, a piping section 220, and an overflow pipe 230.

[0039] The sealed container 210 is a container for storing working water WW inside and is airtightly separated from the outside. The sealed container 210 is located at the end of the piping section 220. The sealed container 210 comprises a container body 211 and a lid 212. The container body 211 may have a bottomed cylindrical shape with an open top and have a capacity of, for example, about 2 liters. The capacity of the container body 211 is sufficient to hold at least one load of working water WW supplied to the lower part 62 of the valve cylinder of the lubricating oil cleaner 1. The cross-sectional shape of the container body 211 is, for example, circular. However, the cross-sectional shape is not limited to a circle and may be an ellipse, rectangle, polygon, or other shape. The lid 212 is a member that airtightly seals the upper end opening of the container body 211 and is detachably provided at the upper end of the container body 211. An insertion hole for the piping section 220 is formed in the center of the lid 212. The inner surface of the insertion hole and the outer surface of the piping section 220 are in close contact, and the inside and outside of the sealed container 210 are airtight.

[0040] The piping section 220 is a component that connects the outlet 3a for the working water WW, which is provided at the lower part of the rotating frame 3A, to the seal container 210. In this embodiment, the piping section 220 is provided between the outlet 3a and the seal container 210 via a drain pipe 190. The drain pipe 190 extends from the lower part of the rotating frame 3A.

[0041] The piping section 220 includes an upstream pipe 221 connected to the drain pipe 190 and a downstream pipe 222 connected to the downstream end of the upstream pipe 221. The upstream pipe 221 extends in the vertical direction. The lower end 190a (see Figure 3A) of the drain pipe 190 is fitted in an airtight manner into the inner part 221a (see Figure 3A) of the upstream pipe 221.

[0042] The downstream pipe 222 extends in the vertical direction. The upper end 222a of the downstream pipe 222 (see Figure 3A) is inserted inside the lower end 221b of the upstream pipe 221 (see Figure 3A) and sealed in an airtight manner. The lower end 222b of the downstream pipe 222 (see Figure 3A) is inserted into the interior of the sealed container 210 through the insertion hole 212a of the lid 212 of the sealed container 210 and extends to the vicinity of the lower end of the container body 211.

[0043] The lower end 222b of the downstream piping 222 (see Figure 3A) is positioned lower than the height at which the working water in the seal container 210 is stored. The outer surface of the downstream piping 222 in the portion through which the lid 212 is inserted is in close contact with the inner surface of the insertion hole 212a, creating an airtight seal between the inside and outside of the seal container 210.

[0044] The overflow pipe 230 is a pipe for draining the working water WW inside the seal container 210 to the sludge tank 700 or another storage tank. The upstream end of the overflow pipe 230 is connected to a through hole formed in the side wall 213 of the container body 211 and opens toward the inside of the seal container 210. Working water WW that exceeds the lower end of the opening at the upstream end of the overflow pipe 230 overflows and is discharged from the seal container 210. In other words, the lower end of the opening at the upstream end of the overflow pipe 230 is the storage height of the working water. The downstream end of the overflow pipe 230 is airtightly connected to a through hole formed in the upper surface of the sludge tank 700 or another storage tank. The working water that flows through the overflow pipe 230 falls and flows toward the sludge tank 700 or another storage tank. Note that the connection location of the overflow pipe 230 to the seal container 210 is not limited to this embodiment.

[0045] In conventional lubrication oil purifiers, an outlet for discharging working water was installed at the bottom of the rotating frame. Since the conventional outlet was open to the atmosphere, in addition to discharging working water, it also served to draw air into the rotating frame while the rotating body of the lubrication oil purifier was rotating.

[0046] In this embodiment, an air intake port 240 is installed in the drain pipe 190 to accommodate the need to draw air into the rotating body frame 3A. The air intake port 240 serves as a supply path for supplying air drawn in from the outside to the lubricating oil purifier 1 when the rotating body 3 is rotating and the working water WW is not being discharged. A check valve is installed at the air intake port 240 to prevent ammonia gas from leaking to the outside. Alternatively, piping or equipment for supplying air may be connected instead of the check valve. The installation location of the air intake port 240 is not limited to the drain pipe 190, but may also be installed in a location where air can be introduced, such as the piping section 220 or the rotating frame 3 of the lubrication oil purifier 1.

[0047] Next, a modified working water discharge device 1200 will be described with reference to Figure 3B. As shown in Figure 3B, this working water discharge device 1200 differs from the above embodiment in that the shape of the drain pipe 1190 is different. The other components are the same as those of the working water discharge device 200 of the above embodiment (see Figure 3A), so the same reference numerals are used and their description is omitted.

[0048] The drain pipe 1190 comprises a horizontal section 1191 and a vertical section 1192, and has a T-shape in side view. The horizontal section 1191 extends horizontally from the lower part of the rotating frame 3A. The vertical section 1192 is positioned at a predetermined distance from the tip of the horizontal section 1191 and is connected perpendicularly to the horizontal section 1191. The lower end of the vertical section 1192 is the lower end 1190a of the drain pipe 1190, and is airtightly fitted into the inner part 221a of the upstream pipe 221 of the piping section 220.

[0049] The tip of the portion of the horizontal pipe section 1191 that protrudes from the connection point with the vertical pipe section 1192 becomes an air intake port 1240. A check valve 1241 is provided in the air intake port 1240. The check valve 1241 is closed when the pressure inside the drain pipe 1190 is greater than the external pressure (atmospheric pressure), and the valve body opens when the pressure inside the drain pipe 1190 becomes less than the external pressure, allowing outside air to enter the drain pipe 1190. As described above, by installing the check valve 1241 in the air intake port 1240, it is possible to reliably prevent the working water and air inside the drain pipe 1190 from leaking to the outside.

[0050] <Water supply line> As shown in Figures 4A and 4B, the water supply line 110 is a water supply means that supplies water W (seal water / displacement water) into the separation chamber SZ (inside the rotating body 3). Furthermore, while the lubricating oil purifier 1 is in operation (while the process of separating aqueous ammonia AW from the raw solution DO is being performed), it is preferable to control the position of the separation interface SB by intermittently or continuously supplying water W into the separation chamber SZ to adjust the specific gravity of the aqueous ammonia AW (heavy liquid). In addition, the water supply line 110 supplies cleaning water into the separation chamber SZ during maintenance or cleaning of the lubricating oil purifier 1. The water supply line 110 is provided with a valve SV3 (not shown) that adjusts the water supply into the separation chamber SZ (inside the rotating body 3). Alternatively, the water supply line 110 adjusts the water supply by controlling the valve SV3 by the control unit 910 and timer 920 based on the measurement value of one of the following: pressure sensor 810, moisture detection sensor 820, ammonia sensor 830, or leak detector 840.

[0051] <Nozzle water supply line> As shown in Figure 2, the nozzle water supply line 111 is a water supply means for sending water W to the nozzle 112.

[0052] <Nozzle> The nozzle 112 is attached to the nozzle water supply line 111 and sprays water W in a shower-like manner into the rotating frame 3A surrounding the rotating body 3. Water droplets AW of ammonia water or ammonia gas discharged into the rotating frame 3A along with the sludge from the sludge discharge port 12 are washed away by the water W sprayed (aerosolized) into the rotating frame 3A, and the ammonia that has gasified inside the rotating frame 3A dissolves in the water W sprayed (aerosolized) into the rotating frame 3A. The nozzle 112 is inserted into the upper part of the rotating frame 3A (above the sludge discharge port 12). The water W sprayed from the nozzle 112 flows through the sludge discharge line 160 and the drain pipe 190 to the sludge tank 700 or another storage tank.

[0053] <Heavy liquid discharge line> As shown in Figures 4A and 4B, the heavy liquid discharge line 120 (drainage means) is a flow path through which the ammonia water AW (separated water) centrifuged in the lubricating oil purifier 1 is discharged, and is connected to the heavy liquid discharge section 15 of the lubricating oil purifier 1. The ammonia water AW (heavy liquid) in the lubricating oil purifier 1 overflows from the heavy liquid discharge section 15 and is released into the heavy liquid discharge line 120, where it is stored in the sludge tank 700 via the sludge discharge line 160 and then discarded. A leak detector 840 may be provided in the heavy liquid discharge line 120.

[0054] <Pressure Sensor> The pressure sensor 810 is a measuring instrument that measures the pressure of the light liquid discharged from the light liquid discharge section 9 of the lubricating oil cleaner 1. The pressure sensor 810 is electrically connected to the control unit 910.

[0055] <Moisture detection sensor> The moisture detection sensor 820 is a measuring instrument that measures the amount of moisture in the light liquid discharged from the light liquid discharge section 9 of the lubricating oil cleaner 1. The moisture detection sensor 820 is electrically connected to the control unit 910. The moisture detection sensor 820 may be omitted depending on the condition of the lubricating oil LO.

[0056] <Ammonia Sensor> The ammonia sensor 830 is a measuring instrument that measures the ammonia concentration of the ammonia water AW discharged from the light liquid discharge section 9 of the lubricating oil purifier 1. The ammonia sensor 830 is electrically connected to the control unit 910. The ammonia sensor 830 may be omitted depending on the condition of the lubricating oil LO.

[0057] <Leak detector> The leak detector 840 is a measuring instrument that mechanically measures the heavy liquid discharged from the heavy liquid discharge section 15 of the lubricating oil cleaner 1. The leak detector 840 is electrically connected to the control unit 910. The leak detector 840 may be omitted depending on the condition of the lubricating oil LO.

[0058] <Control device> The control device 900 (control means) shown in Figures 4A and 4B has the function of supplying water W to the lubricating oil purifier 1 intermittently or continuously at a preset timing or at any timing to maintain the specific gravity of the ammonia water AW (heavy liquid) in the separation chamber SZ at or above a predetermined value. The control device 900 is configured to include a control unit 910 and a timer 920. The control unit 910 is connected to the timer 920, a pressure sensor 810, a moisture detection sensor 820, an ammonia sensor 830, and a leak detector 840.

[0059] Furthermore, the control device 900 controls the opening and closing of various on-off valves and switching valves (three-way valve 134, valve SV3, etc.), as well as the opening and closing of the sludge discharge port 12 (up and down movement of valve cylinder 6). The control device 900 can perform partial discharge control to intermittently discharge the contents of the separation chamber SZ, as well as total discharge control (first control) to discharge all the contents of the separation chamber SZ. In addition, it can perform second control to supply water (washing water) W into the separation chamber SZ using a water supply means after total discharge, and re-total discharge control (third control) to discharge all the water in the separation chamber SZ after the second control.

[0060] <Cleaning lubricant> The clean lubricating oil is lubricating oil LO that has been purified by the lubricating oil purifier 1. The clean lubricating oil is then stored again in the lubricating oil tank 350 via the light liquid discharge line 140 from the lubricating oil purifier 1, and then supplied to the ship's engine or auxiliary machinery (e.g., generator, boiler, etc.).

[0061] ≪Effect≫ According to the working water discharge device 200 and lubricating oil cleaning system 100 of this embodiment, the discharge port (drain pipe 190) for working water WW provided on the rotating frame 3A is connected to the sludge tank 700 or another storage tank via the piping section 220, the seal container 210, and the overflow pipe 230. Therefore, the inside of the rotating frame 3A, each flow path (piping section 220, seal container 210, and overflow pipe 230), and the sludge tank 700 or another storage tank are airtightly partitioned from the outside. Consequently, even if ammonia gas AG contained in the raw solution DO leaks into the rotating frame 3A, the gas will not be released into the atmosphere.

[0062] When ammonia gas (AG) dissolves in working water (WW), its specific gravity becomes lower than that of water. Inside the sealed container 210, the working water WW with dissolved ammonia gas (AG) has a lower specific gravity than water without dissolved ammonia gas (AG), and therefore floats to the top of the container body 211. As a result, it is appropriately discharged from the overflow pipe 230, which opens at the upper end of the working water WW, to the sludge tank 700 or another storage tank.

[0063] Furthermore, since the working water WW stored in the seal container 210 separates the space inside the rotating frame 3A from the space inside the sludge tank 700 or another storage tank, even if negative pressure is created inside the rotating frame 3A, the sludge (waste) from the sludge tank 700 or the other storage tank will not flow back into the rotating frame 3A.

[0064] Furthermore, since the sealed container 210 comprises a container body 211 with an open top and a lid 212 that is detachably attached to the container body 211, water can be easily stored in the sealed container 210 by removing the lid 212 before operating the lubricating oil cleaner 1. In addition, the inside of the sealed container 210 can be visually inspected during maintenance, etc.

[0065] According to the lubricating oil cleaning system 100 of this embodiment, ammonia (ammonia water) mixed in the raw DO is removed by the lubricating oil cleaner 1, and cleaned lubricating oil LO is obtained. Specifically, the lubricating oil cleaner 1 can separate lubricating oil LO, sludge SG, and ammonia water AW from the raw DO.

[0066] Furthermore, as shown in Figure 2, the system is equipped with a working water discharge device 200 for discharging the working water injected into the rotating frame 3A, so that the working water that has taken in ammonia gas AG from within the rotating frame 3A can be effectively discharged outside the system.

[0067] [Differentiation] It should be noted that the present invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of its technical concept. Naturally, the present invention also extends to such modified and altered inventions.

[0068] In the above embodiment, the piping section 220 is configured by connecting the upstream pipe 221 and the downstream pipe 222, but it is not limited to this and may be configured with a single pipe. With such a configuration, the number of parts is reduced and construction time can be reduced.

[0069] Furthermore, in the above embodiment, the container body portion 211 of the sealed container 210 is a bottomed cylindrical shape, but it is not limited to this. For example, a U-shaped trap pipe may be used in the container body portion. Also, although the sealed container 210 comprises a container body portion 211 and a lid portion 212 that can be attached to it, it may also be made of a part of the container body portion with a closed top. In this case, a through hole for the piping portion 220 is formed in the top plate portion of the container body portion.

[0070] Furthermore, while this embodiment describes a lubricating oil purification system capable of purifying a raw solution contaminated with ammonia into lubricating oil, and a working water discharge device applied thereto, the gas to be removed is not limited to ammonia. For example, any gas whose liquid, when dissolved in water, has a specific gravity lower than that of water, such as methanol, can be applied. [Explanation of symbols]

[0071] 1. Lubricating oil cleaner (purifier) 3. Rotating bodies 3A Rotating Frame 3a Outlet 6 Valve Cylinder 12 Sludge outlet 100 Lubricant Cleaning System 190 Drain pipe 200 Working water discharge device 210 sealed containers 211 Container body 212 Lid 220 Piping section 221 Upstream piping 222 Downstream piping 230 Overflow pipe 300 institutions 700 Sludge Tank (Tank) 1240 Air intake 1241 Check valve DO stock solution WW working water

Claims

1. A purifier having a rotating body for separating a raw liquid into a heavy liquid and a light liquid, and a rotating body frame for housing the rotating body, The rotating body includes a sludge discharge port for discharging sludge accumulated inside it, and a valve cylinder for opening and closing the sludge discharge port. In a working water discharge device installed on the rotating frame for discharging the working water that operates the valve cylinder into a tank that is airtightly separated from the outside, A sealed container that is airtightly separated from the outside and stores the aforementioned working water inside, The outlet for the working water provided on the rotating frame and the seal container are connected in an airtight manner, and the lower end of the piping portion is located inside the seal container, The seal container is equipped with an overflow pipe for discharging the working water, The overflow pipe connects the seal container and the tank in an airtight manner. A working water discharge device characterized by the following features.

2. The overflow pipe is provided in the seal container and discharges the working water into the tank from a position higher than the lower end of the piping section. The working water discharge device according to claim 1.

3. The sealed container comprises a container body with an open upper end and a lid that is detachably attached to the container body. The aforementioned piping extends through the lid and into the interior of the container body. The working water discharge device according to claim 1 or 2, characterized in that

4. An air intake port is provided in at least one of the following: the piping section, the rotating frame, and the drain pipe connected to the working water outlet and extending from the rotating frame. The working water discharge device according to claim 1 or 2, characterized in that

5. A check valve is provided at the aforementioned air intake port. The working water discharge device according to feature 4.

6. A lubricating oil cleaning system that can purify a raw liquid contaminated with ammonia into lubricating oil, The organization and A purifier having a rotating body that separates the raw liquid containing the lubricating oil used in the aforementioned engine into a light liquid which is the purified lubricating oil and a heavy liquid which contains ammonia, The system includes an operating water discharge device that discharges operating water, which is used to operate a valve cylinder for opening and closing a sludge discharge port for discharging sludge accumulated inside the purifier, from within the rotating body frame housing the rotating body into a tank. The heavy liquid is discharged into a tank. The working water discharge device comprises a sealed container that is airtightly partitioned from the outside and stores the working water inside; a piping section that airtightly connects the working water discharge port provided on the rotating frame to the sealed container, with its lower end located inside the sealed container; and an overflow pipe whose upstream side is connected to a position higher than the lower end of the piping section within the sealed container, and whose downstream side is airtightly connected to the tank. A lubricating oil cleaning system characterized by the following features.

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