JP5323154B2 - Oil smoke recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil smoke recovery apparatus that recovers oil smoke in a thrust bearing oil tank, and then, liquefies the oil smoke and returns it into the thrust bearing oil tank without using power. <P>SOLUTION: Air in a recovery tank 11 is sucked through air-intake piping 22 by using a negative draft pressure during the operation of a water turbine generator, thereby introducing oil smoke of thrust bearing lubricating oil generated in a thrust bearing oil sump 1 into the recovery tank via oil smoke recovery piping 21. The oil smoke is cooled by thrust cooling water flowing in cooling water piping 23 in the recovery tank, thereby liquefying thrust bearing oil in the oil smoke and recovering it in a receiving tray 12, and further, returning it to the thrust bearing oil sump via an oil recovery chamber 13, an oil return chamber 14, and oil return piping 24 without using power. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an oil smoke recovery apparatus suitable for recovering oil smoke of thrust bearing lubricating oil (turbine oil) generated in a thrust bearing oil tank by operation of a water turbine generator.

Since the temperature in the thrust bearing oil tank in which the lubricating oil for the thrust bearing of the turbine generator (hereinafter referred to as “lubricating oil”) is stored rises due to the operation of the turbine generator, the lubricating oil evaporates and the inside of the thrust bearing oil tank Oil smoke is generated.
Oil smoke generated in the thrust bearing oil tank is sucked in by rotation of the rotor and adheres to the stator coil vents, causing clogging due to dust accumulation and temperature rise of the stator coil. Leaking out of the gap between the oil tank and the thrust bearing oil tank and causing contamination of peripheral equipment.
Therefore, the electric power company responds by cleaning the stator coils and peripheral devices during a thorough inspection of the turbine generator.

  Further, since the oil level of the thrust bearing oil tank is lowered with the generation of the oil smoke, the lubricating oil is appropriately supplied to the thrust bearing oil tank.

Patent Document 1 below discloses an oil smoke collection tank having an oil smoke induction pipe in order to efficiently remove oil smoke generated during frying operation of a food frying device or during cutting of a machine tool with a simple and compact configuration. The oil smoke inside is sent to the oil smoke removal water tank with a blower, and it is absorbed and removed in the stored water by colliding with the water film and water droplets formed by the water film forming rotor blades provided in the oil smoke removal water tank. An oil smoke removing apparatus is disclosed in which a pipe is recirculated to an oil smoke recovery tank to perform a recoil removal action.
In addition, in Patent Document 2 below, in order to remove oils and fats in the oily smoke by actively using a cleaning solution and the like, and to efficiently remove oils and fats in the oily smoke by using various oily smoke treatment means in combination. Then, water is dropped on the disc, and the exhaust air containing oily smoke is passed through the rotary atomizing filter that is atomized by rotating the disc, and then cooled with a cooler. An oil and smoke processing machine is disclosed in which a fat and oil adhering to a cooler is washed with washing water ejected from a washing spray nozzle through a filter.

JP-A-11-197430 JP 05-137934 A

However, since the thorough inspection of the water turbine generator is performed in a cycle of 10 to 15 years, there has been a problem that the temperature of the stator coil increases during that time.
Aged turbine generators also increase the temperature in the thrust bearing oil tank due to clogging of the thrust cooling water piping, increasing the amount of smoke generated, causing peripheral equipment to become dirty and increase the number of lubrication oil replenishments. There was a problem that.

  In addition, the conventional smoke removal / treatment device such as the oil smoke removal device disclosed in Patent Document 1 and the oil smoke treatment device disclosed in Patent Literature 2 are both complicated in mechanism and collect oil smoke by power. Therefore, there is a problem that power is consumed and the device itself is expensive.

  An object of the present invention is to provide an oil smoke recovery device that can liquefy and return the oil in the thrust bearing oil tank to the thrust bearing oil tank after recovering the oil smoke in the thrust bearing oil tank without power.

The oil smoke recovery device of the present invention is an oil smoke recovery device (10) for recovering oil smoke of thrust bearing lubricating oil generated in a thrust bearing oil tank (1) by operation of a water turbine generator, and is an oil smoke recovery pipe. The thrust bearing oil tank is communicated with the thrust bearing oil tank via (21), communicated with the draft of the turbine generator via the intake pipe (22), and with the thrust bearing oil tank via the oil return pipe (24). The thrust cooling water is branched from the communication recovery tank (11) and the thrust cooling water pipe (2) for supplying the thrust cooling water into the thrust bearing oil tank, and is passed through the recovery tank. A cooling water pipe (23) laid in the drain pit, the recovery tank being installed above the thrust bearing oil tank, and the thrust shaft during operation of the turbine generator The smoke dust of the lubricating oil for the thrust bearing generated in the oil tank is taken into the recovery tank through the oil smoke recovery pipe using the negative pressure of the draft, and the oil smoke taken into the recovery tank is taken into the thrust tank The liquefied oil is liquefied by cooling with cooling water, and the liquefied oil liquefied is returned to the thrust bearing oil tank through the oil return pipe.
Here, an oil outflow prevention filter (15) for preventing the liquefied oil from flowing out into the river through the intake pipe and the draft may be attached to the intake pipe.
A tray (12) for receiving the liquefied oil is provided in the recovery tank under the cooling water pipe, and an oil recovery chamber (13) and an oil return chamber (14) are provided in the recovery tank. Is provided between the tray and the bottom surface of the recovery tank, and a pipe for dropping the liquefied oil received by the tray into the oil recovery chamber may be attached to the tray.
The oil recovery chamber is divided into a left chamber and a right chamber by a partition plate attached with a moderate gap between the bottom surface of the recovery tank, and the left chamber and the right chamber of the oil recovery chamber The chamber is filled with oil separation water (W), and the left chamber of the oil recovery chamber is filled with anti-evaporation oil (L) for preventing evaporation of the oil separation water, The right chamber of the oil recovery chamber is sealed by the partition plate and the top plate except for a gap between the bottom surface of the recovery tank and the partition plate in order to prevent the oil separation water that has evaporated from flowing out. It may be.
An oil recovery chamber drain pipe (25) for discharging excess water accumulated in the oil recovery chamber is attached to the oil recovery chamber, and the oil recovery chamber drain is connected to the oil recovery chamber drain pipe. A valve (33) is attached, and an oil recovery chamber viewing window for examining the water level in the oil recovery chamber may be installed in the oil recovery chamber.
An oil return chamber drain pipe (26) for discharging water accumulated in the oil return chamber is attached to the oil return chamber, and the oil return chamber drain valve (26) is connected to the oil return chamber drain pipe. 34) may be attached, and an oil return chamber inspection window (14a) may be installed in the oil return chamber for examining the water level in the oil return chamber.
An intake piping valve (31) and a cooling water piping valve (32), which are electromagnetic valves that are opened by an electrical signal indicating that the water turbine generator is in operation, are respectively attached to the intake piping and the cooling water piping. May be.

The oil smoke recovery apparatus of the present invention has the following effects.
(1) Oil smoke is taken into the recovery tank installed above the thrust bearing oil tank using the negative pressure of the draft, then cooled with thrust cooling water to liquefy, and liquefied oil is transferred from the recovery tank to the thrust bearing oil tank. By dropping it back and recovering the oil smoke in the thrust bearing oil tank without power, it can be liquefied and returned to the thrust bearing oil tank.
(2) It is possible to prevent contamination of the stator coil and peripheral devices due to oily smoke.
(3) Since the temperature rise of the stator coil can be suppressed, the life of the stator coil can be extended.
(4) The amount of lubricating oil supplied to the thrust bearing oil tank can be reduced.

It is a figure for demonstrating the structure of the oil smoke collection | recovery apparatus 10 by one Example of this invention.

  For the above purpose, the recovery tank is installed above the thrust bearing oil tank, the oil smoke generated in the thrust bearing oil tank is taken into the recovery tank using the negative pressure of the draft, and then cooled with thrust cooling water. It was realized by liquefying and dropping the liquefied oil from the recovery tank back to the thrust bearing oil tank.

Hereinafter, embodiments of the oil smoke recovery apparatus of the present invention will be described with reference to the drawings.
The oil smoke recovery apparatus of the present invention utilizes the draft vacuum (draft negative pressure) and thrust cooling water present in most hydroelectric power plants, and then takes the oil smoke generated in the thrust bearing oil tank into the recovery tank. It is characterized by being liquefied and returned to the thrust bearing oil tank.

  Therefore, as shown in FIG. 1, the oil smoke recovery apparatus 10 according to one embodiment of the present invention is communicated with the turbine bearing of the turbine generator 1 via the oil smoke recovery pipe 21 and the draft (suction pipe) of the turbine generator. And a recovery tank 11 communicated through a thrust bearing oil tank 1 and an oil return pipe 24.

The recovery tank 11 is installed above the thrust bearing oil tank 1, and is about 50 cm in width (length in the horizontal direction of the paper surface in FIG. 1), about 30 cm in length (length in the direction perpendicular to the paper surface in FIG. 1) and height. (Longitudinal length of the paper surface of the figure) It has a rectangular parallelepiped shape of about 40 cm.
In the following description, the left side of the collection tank 11 shown in FIG. 1 is the “left side”, the side facing the left side is the “right side”, the front side is the “front”, and the front side is the front. The surface to be referred to is referred to as “rear surface”, the upper surface in the figure is referred to as “upper surface”, and the surface facing the upper surface is referred to as “bottom surface”. The same applies to an oil recovery chamber 13 and an oil return chamber 14, which will be described later.

One end of the oil smoke recovery pipe 21 is fixed to the central portion of the left side surface of the recovery tank 11, and one end of the intake pipe 22 is fixed to the central portion of the right side surface of the recovery tank 11.
Thereby, during operation of the water turbine generator, since the pressure in the draft is negative due to the water flowing in the draft, the thrust bearing oil tank is obtained by sucking the air in the recovery tank 11 using this negative pressure. The oil smoke generated in 1 can be taken into the recovery tank 12 via the oil smoke recovery pipe 21.

An intake pipe valve 31 is attached to the intake pipe 21, and the intake pipe valve 31 is opened only during the operation of the water turbine generator to suck the air in the collection tank 11.
The intake piping valve 31 may be manually opened and closed by a worker as a manual valve, but is automatically operated as an electromagnetic valve that is opened by an electric signal indicating that the turbine generator is in operation (that is, under a generator parallel condition). You may make it open and close.

A cooling water pipe 23 through which cooling water for cooling and liquefying the oil smoke taken into the recovery tank 11 is passed through the recovery tank 11.
In FIG. 1, for the sake of simplicity, the cooling water pipes 23 are shown as passing through the collection tank 11 in a single row so as to meander up and down. It is passed so that several rows line up and down from the front to the back.

Here, the cooling water pipe 23 is used to supply the thrust cooling water to the thrust bearing oil tank 1 in order to use the thrust cooling water for cooling the lubricating oil in the thrust bearing oil tank 1 as the cooling water for the oil smoke. The thrust cooling water pipe 2 is branched, inserted into the recovery tank 11 from the front side of the upper left side of the recovery tank 11, passed through the recovery tank 11, and the rear surface above the right side of the recovery tank 11. After coming out from the side, it is laid in the thrust cooling water drainage pit.
Thereby, the oil smoke taken into the recovery tank 11 is cooled and liquefied by the thrust cooling water flowing through the cooling water pipe 23 in the recovery tank 11.

The cooling water piping valve 32 is attached in the vicinity of the branch point of the cooling water piping 23 with the thrust cooling water piping 2, and the cooling water piping valve 32 is opened only during the operation of the turbine generator. Cooling water is poured into the collection tank 11.
The cooling water piping valve 32 may be manually opened and closed by a worker as a manual valve. However, similar to the intake piping valve 31 described above, the cooling water piping valve 32 is operated by an electrical signal indicating that the turbine generator is in operation (that is, power generation). It may be automatically opened and closed as a solenoid valve that opens (under machine parallel conditions).

  In this way, oil smoke is taken into the recovery tank 12 using the negative pressure of the draft and the oil smoke is liquefied using the thrust cooling water, so that the oil smoke is liquefied (hereinafter referred to as “liquefied oil”). Is prevented from flowing out into the river through the intake pipe 22 and the draft, an oil outflow prevention filter 15 is attached to one end of the intake pipe 22.

A receiving tray 12 for receiving liquefied oil is provided below the cooling water pipe 23 in the recovery tank 12.
The tray 12 is attached to a height of about 15 cm from the bottom surface of the recovery tank 11 in order to provide the oil recovery chamber 13 and the oil return chamber 14 at the bottom of the recovery tank 11.
Further, one end of a pipe for dropping the liquefied oil into the oil recovery chamber 13 is fixed to the right side surface of the tray 12.

The oil recovery chamber 13 is provided on the right side of the bottom of the recovery tank 11 so as to have dimensions of 15 cm in width, 15 cm in length, and 10 cm in height.
The oil recovery chamber 13 is divided into a left chamber and a right chamber by a partition plate attached with a moderate gap between the bottom surface of the recovery tank 11.
In the left and right chambers of the oil recovery chamber 13, oil separation water W is inserted to a depth of about 6 cm. In the left chamber of the oil recovery chamber 13, evaporation prevention for preventing evaporation of the oil separation water W The oil L (the same as the lubricating oil for thrust bearings) is placed at a depth of about 2 cm.
The right chamber of the oil recovery chamber 13 is sealed by a partition plate and a top plate except for a gap between the bottom surface of the recovery tank 11 and the partition plate in order to prevent the oil separation water W that has evaporated from flowing out. .
Note that the oil separation water W and the evaporation preventing oil L need not be replenished in principle because liquefied oil and water accumulate in the oil recovery chamber 13.

As a result, when the liquefied oil falling on the tray 12 passes through the pipe and accumulates in the left chamber of the oil recovery chamber 13, the liquefied oil floats on the oil separation water W, so that the water level of the left chamber of the oil recovery chamber 13 is lowered. At the same time, the water level of the right chamber of the oil recovery chamber 13 rises, and the oil level of the left chamber of the oil recovery chamber 13 and the water level of the right chamber of the oil recovery chamber 13 are balanced by the level difference of the specific gravity difference between water and oil.
Although the water level of the left chamber of the oil recovery chamber 13 is lowered by the liquefied oil, the liquefied oil enters the right chamber of the oil recovery chamber 13 because it overflows from the left chamber before reaching the level of the gap of the partition plate. There is nothing.

  When the liquefied oil continues to accumulate in the left chamber of the oil recovery chamber 13, the liquefied oil (which is a mixed oil of the liquefied oil and the evaporation preventing oil L, but hereinafter referred to as “liquefied oil”) is stored in the oil recovery chamber 13. It overflows from the left ventricle and accumulates in the oil return chamber 14.

One end of the oil return pipe 24 for returning the liquefied oil accumulated in the oil return chamber 14 to the thrust bearing oil tank 1 is formed on the left side surface of the oil return chamber 14 from the bottom surface of the oil return chamber 14 (the bottom surface of the recovery tank 11). It is fixed at a height of about 1 cm.
The other end of the oil return pipe 24 is fixed to the upper surface of the thrust bearing oil tank 1.
Thereby, since the collection tank 11 is installed above the thrust bearing oil tank 1, the liquefied oil accumulated in the oil return chamber 14 can be returned to the thrust bearing oil tank 1 without using power.

When the moisture in the recovery tank 11 becomes water droplets and accumulates in the left chamber of the oil recovery chamber 13, the water level in the left and right chambers of the oil recovery chamber 13 rises, so that the water in the oil recovery chamber 13 (oil separation water W And water mixed with water droplets, hereinafter referred to as “water”) overflows from the left chamber of the oil recovery chamber 13 and accumulates in the oil return chamber 14.
Therefore, one end of an oil recovery chamber drain pipe 25 for discharging excess water accumulated in the oil recovery chamber 13 is fixed to the right side surface of the oil recovery chamber 13, and the oil recovery chamber drain pipe An oil recovery chamber drain valve 33 is attached to one end side of 25. In addition, an oil recovery chamber viewing window (not shown) is installed in front of the oil recovery chamber 13.
As a result, the worker periodically looks through the observation window of the oil recovery chamber, checks the water level in the oil recovery chamber 13, and when the water level in the oil recovery chamber 13 becomes higher than a predetermined water level, By opening the drain valve 33 and draining water, it is possible to prevent water in the oil recovery chamber 13 from overflowing and collecting in the oil return chamber 14.

  Since it is considered that such drainage may be performed several times a year, the oil recovery chamber drain valve 33 may be manually opened and closed by an operator as a manual valve. And a water level detection float in the oil recovery chamber 13 to control the recovery chamber drain valve 33 so that it opens when the water level detected by the water level detection float becomes higher than a predetermined water level. By doing so, the water draining operation of the oil recovery chamber 13 may be automated.

When water droplets adhere to the inner surface of the collection tank 11, the water droplets fall and accumulate water in the oil return chamber 14.
Therefore, one end of an oil return chamber drain pipe 26 for discharging the water accumulated in the oil return chamber 14 is fixed to the left side of the bottom surface of the oil return chamber 14, and the oil return chamber drain. An oil return chamber drain valve 34 is attached to one end of the pipe 26. An oil return chamber observation window 14 a is installed near the oil return chamber drain pipe 26 in front of the oil return chamber 14.
As a result, even if water droplets on the inner surface of the recovery tank 11 accumulate in the oil return chamber 14, an operator periodically looks through the oil return chamber observation window 14 a to confirm that water has accumulated in the oil return chamber 14. If it confirms, the water return to oil return can be prevented by opening the oil return chamber drain valve 34 and draining water.

DESCRIPTION OF SYMBOLS 1 Thrust bearing oil tank 2 Thrust cooling water pipe 10 Oil smoke recovery device 11 Recovery tank 12 Receptacle 13 Oil recovery chamber 14 Oil return chamber 14a Oil return chamber observation window 15 Oil outflow prevention filter 21 Oil smoke recovery piping 22 Air intake piping 23 Cooling Water pipe 24 Oil return pipe 25 Oil recovery chamber drain pipe 26 Oil return chamber drain pipe 31 Intake pipe valve 32 Cooling water pipe valve 33 Oil recovery chamber drain valve 34 Oil return chamber drain valve W Oil separation Water L Evaporation prevention oil

Claims (7)

An oil smoke recovery device (10) for recovering oil smoke of thrust bearing lubricating oil generated in a thrust bearing oil tank (1) by operation of a water turbine generator,
It communicates with the thrust bearing oil tank through the oil smoke recovery pipe (21), communicates with the draft of the water turbine generator through the intake pipe (22), and communicates with the oil return pipe (24). A recovery tank (11) in communication with the thrust bearing oil tank;
A cooling water pipe branched from a thrust cooling water pipe (2) for supplying thrust cooling water into the thrust bearing oil tank, passed through the recovery tank, and laid in a drain pit of the thrust cooling water (23)
The recovery tank is installed above the thrust bearing oil tank,
Taking the oil smoke of the thrust bearing lubricating oil generated in the thrust bearing oil tank during operation of the water turbine generator into the recovery tank through the oil smoke recovery pipe using the negative pressure of the draft,
The oil smoke taken into the recovery tank is liquefied by cooling with the thrust cooling water,
Returning the liquefied oil in which the oily smoke has been liquefied to the thrust bearing oil tank via the oil return pipe,
An oil smoke recovery device.   The oil outflow prevention filter (15) for preventing the liquefied oil from flowing out into the river through the intake pipe and the draft is attached to the intake pipe. The oil smoke recovery apparatus according to 1. In the recovery tank, a tray (12) for receiving the liquefied oil is provided under the cooling water pipe,
In the recovery tank, an oil recovery chamber (13) and an oil return chamber (14) are provided between the tray and the bottom surface of the recovery tank,
A pipe for dropping the liquefied oil received by the saucer into the oil recovery chamber is attached to the saucer.
The oil smoke recovery apparatus according to claim 1 or 2, wherein The oil recovery chamber is divided into a left chamber and a right chamber by a partition plate attached with a moderate gap between the bottom surface of the recovery tank,
Oil separation water (W) is placed in the left chamber and the right chamber of the oil recovery chamber,
Anti-evaporation oil (L) for preventing evaporation of the oil separation water is placed in the left chamber of the oil recovery chamber,
The right chamber of the oil recovery chamber is sealed by the partition plate and the top plate except for a gap between the bottom surface of the recovery tank and the partition plate in order to prevent the oil separation water that has evaporated from flowing out. Being
The oil smoke recovery apparatus according to claim 3, wherein: The oil recovery chamber is provided with an oil recovery chamber drain pipe (25) for discharging excess water accumulated in the oil recovery chamber,
An oil recovery chamber drain valve (33) is attached to the oil recovery chamber drain pipe,
In the oil recovery chamber, an oil recovery chamber viewing window for examining the water level in the oil recovery chamber is installed.
The oil smoke recovery device according to claim 4, wherein An oil return chamber drain pipe (26) for discharging water accumulated in the oil return chamber is attached to the oil return chamber,
An oil return chamber drain valve (34) is attached to the oil return chamber drain pipe,
An oil return chamber inspection window (14a) for checking the water level in the oil return chamber is installed in the oil return chamber.
The oil smoke recovery apparatus according to claim 4 or 5, wherein An intake piping valve (31) and a cooling water piping valve (32), which are electromagnetic valves opened by an electrical signal indicating that the water turbine generator is in operation, are respectively attached to the intake piping and the cooling water piping. The oil smoke recovery apparatus according to any one of claims 1 to 6, wherein

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