JPH02102301A - High-pressure oil generating device - Google Patents

Abstract

PURPOSE:To prevent operating oil temperature from rising by providing a cooler down an oil cleaning filter in an oil cleaning line in which oil pressurized by a high-pressure oil pump and delivered to an electrically and hydraulically operated control device of a turbine is partly introduced. CONSTITUTION:A high-pressure oil pump 12 of a high-pressure oil generating device 11 is provided in a delivery line 14 through which oil in an oil reservoir 13 is introduced as operating oil to an electrically and hydraulically operated control device of a steam turbine. In the delivery line 14, a line filter 15 is provided down the high-pressure oil pump 12. Also, the operating oil returning from the electrically and hydraulically operated control device through a drain line 16 is introduced in a return line 17 in which an oil cooler 18 is provided. A flow control valve 20, check valve 21 and oil cleaning filter 22 are provided in an oil cleaning line 19 separated from between the high-pressure oil pump 12 and line filter 15, and the oil cleaning line 19 down the oil cleaning filter 22 is connected to the oil cooler 18 in the return line 17.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a high-pressure oil pressure generator that supplies control oil to an electric/hydraulic control device in a steam turbine of a thermal or nuclear power plant or the like. .

(Prior Art) Control oil is supplied to an electric/hydraulic control device in a steam turbine from a high-pressure oil pressure generator that is separate from a oil pressure generator for bearing oil supply. This control oil is required not only to have very strict cleanliness due to its relationship with each device used for control, but also to be chemically stable.

Therefore, in high-pressure oil pressure generators, a line filter is installed in the system line of the high-pressure oil pump, and an oil cleaning filter is installed in the oil cleaning line to improve the cleanliness and chemical stability of the control oil. It is being In addition, the cleanliness and chemical stability of the control oil must be maintained at all times.
An oil circulation pump separate from the high-pressure oil pump is provided so that the control oil passes through the oil cleaning line even when the high-pressure oil pump is stopped.

This conventional high-pressure oil pressure generator will be explained in detail with reference to FIG.

A high-pressure oil pump 1 boosts the pressure of oil from an oil tank 2, guides a portion of it to a line filter 3 for cleaning, and sends it as control oil to an electric/hydraulic control device of a steam turbine. The flow rate of the other pressurized oil from the high-pressure oil pump 1 is controlled by a flow rate regulating valve 4, guided to an oil cleaning filter 6 via a stop valve 5, cleaned, and returned to the oil tank 2. The control oil is cleaned by passing it through the oil cleaning filter 6. 9I+li and chemical stability are ensured.

On the other hand, since there is no need to operate the high-pressure oil pump 1 when the plant is stopped, the high-pressure oil pump 1 may be stopped. At this time as well, it is necessary to ensure the cleanliness and chemical stability of the control oil, so a certain amount of the control oil is always guided to the oil juice filter 6. For this purpose, an oil circulation pump 7 is separately installed. A stop valve 8 is installed in the discharge line of this oil circulation pump 7. Therefore, when the high pressure oil pump 1 is stopped, the stop valve 5 is closed and the stop valve 8 is closed.
Operate the oil circulation pump 7 to fill the oil tank 2.
A certain amount of til oil is guided to an oil cleaning filter 6.

By the way, during normal operation of the steam turbine, the high pressure oil pump 1
When the steam turbine is in operation, a large amount of control oil is supplied to the electric/hydraulic control device of the steam turbine, and therefore a large amount of oil is returned from the system drain 9 to the oil tank 2. At this time, the 1lIII oil returning from the system drain 9 passes through the oil cooler 10 and returns to the oil tank 2, so the heat generated by the 111 pressure oil pump 1 is removed by the oil cooler 10, and the temperature of the control oil is kept constant. It is maintained.

However, when the steam turbine is stopped while the high-use oil pump 1 is in operation, almost no control oil is introduced to the electric/hydraulic control device, and therefore, the amount of control oil that returns from the system drain 9 to the oil tank 2 is also significantly reduced.

Therefore, the oil cooler 10 is almost unable to remove the heat generated in the high-pressure oil pump 1.

Generally, the high-pressure oil pump 1 generates a large amount of heat because it generates high-pressure oil. Therefore, when the steam turbine stops while the high-pressure oil pump 1 is operating, the temperature of the control oil gradually increases,
Eventually, there is a risk that the maximum operating temperature limit of the control oil will be exceeded.

Furthermore, if the flow rate regulating valve 4 is damaged while the high pressure oil pump 1 is in operation while the steam turbine is in operation or stopped, for example,
The control oil will no longer be guided to the oil cleaning filter 6.

If this condition continues for a long time, the cleanliness and chemical stability of the control oil will deteriorate, leading to deterioration of the control oil and potentially causing serious damage to the steam turbine's electric and hydraulic control equipment.

(Problem to be Solved by the Invention) As described above, in the conventional high-pressure oil pressure generating device that supplies control oil to the electric/hydraulic control device of the steam turbine, the high-pressure oil pump 1 is turned on while the steam turbine is stopped. There is a risk that the humidity of the control oil will rise rapidly during operation.

This invention was made in consideration of the above facts,
The purpose is to provide a Takato hydraulic power generation system that can prevent the temperature of the control oil supplied to the turbine's electric/hydraulic control device from rising even if the turbine stops while the high-pressure oil pump is operating. shall be.

(Structure of the Invention) (Means for solving the problem in an M-shape) This invention provides a method for pumping oil in an oil tank to a high pressure oil pump.
υJllll to the electric/hydraulic control device of the turbine.
In addition to supplying it as oil, a part of the pressurized oil from the high-pressure oil pump is guided to an oil cleaning line, cleaned by an oil cleaning filter installed in this oil cleaning line, and returned to the -1-2 oil tank. In the high-pressure hydraulic constant-quenching device, a cooler is installed in the oil cleaning line downstream of the oil cleaning filter to lower the temperature of the oil purified by the oil cleaning filter and transfer it to the oil tank. Return? lJ, there are some that have been constructed.

(Function) When the turbine stops, the turbine's electric/hydraulic 11i
(J @ Since the control oil that returns from the equipment to the oil tank through the oil cooler rapidly decreases, the heat generated by the operation of the high-pressure oil pump is no longer removed by the oil cooler, but
The oil flowing through the oil cleaning line passes through a cooler, which allows heat generated by the high-pressure oil pump to be removed. Therefore, even if the turbine is stopped during operation of the high-pressure oil pump, temperature-induced disease in the control oil supplied to the electric/hydraulic control device of the turbine can be prevented.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a system diagram showing an embodiment of a high-pressure oil pressure generator according to the present invention. The high-pressure oil pump 12 of the high-pressure oil pressure generator 11 uses the oil in the oil tank 13 as control oil to guide the system to the electric/hydraulic control system 14 of the steam turbine.
will be installed in A line filter 15 is installed in the system outgoing line 14 on the downstream side of the high-pressure oil pump 12 to ensure the cleanliness and chemical stability of the oil (control oil) pressurized by the high-pressure oil pump 12. In addition, steam turbine electricity
The return control oil from the drain line 16 in the hydraulic control device is led to the post-system line 17, and this post-system line 1
The oil is returned to the oil tank 13 through an oil cooler 18 installed at 7.

On the other hand, an oil cleaning line 19 is provided in the system outgoing line 14 by branching from between the high pressure oil pump 12.13 and the line filter 15. This oil cleaning line 19 has a flow rate regulating valve 2.
0, a check valve 21 and an oil cleaning filter 22 are installed, respectively. The oil cleaning line 19 on the downstream side of the oil cleaning filter 22 is connected to the upstream side of the oil cooler 18 in the post-system line 17 . Therefore, the oil cooler 18 also functions as a cooler for the oil cleaning line 19.

The flow rate adjustment valve 20 is controlled 117I so that a constant amount of pressurized oil from the high-pressure oil pump 12 is guided to the oil cleaning line 19 at all times.

Further, the check valve 21 is configured to allow oil to flow from the flow rate adjustment valve 20 toward the oil purifying filter 22, and to prevent oil from flowing in the opposite direction. Further, the oil cleaning filter 22 cleans the oil flowing through the oil cleaning line 19 and cleans the oil flowing through the oil cleaning line 19.
Similar to 5, the cleanliness and chemical stability of the control oil are maintained well.

A circulation line 23 is also attached to the oil tank 13. In this circulation line 23, an oil circulation pump 24 and a check valve 25 are respectively arranged from the oil tank 13 side.

The other end of the circulation line 23 is connected between the check valve 21 and the oil cleaning filter 22 in the oil cleaning line 19 . Here, the check valve 25 is configured to allow oil to flow from the oil circulation pump 24 to the oil cleaning filter 22 and to prevent oil from flowing from the oil cleaning filter 22 to the oil circulation pump 24.

Now, an oil pressure detector 26 is installed in the oil cleaning line 19 immediately upstream of the oil cleaning filter 22. This oil pressure detector 26
is electrically connected to the oil circulation pump 24 and the alarm generator 27. The oil pressure detector 26 outputs a start command signal A to the oil circulation pump 24 to automatically start the oil circulation pump 24 when the oil pressure on the upstream side of the oil purification filter 22 in the oil purification line 19 becomes less than a specified value. At the same time, an alarm signal B is output to the alarm generator 27, and this alarm generator 2
7.

Next, the effects will be explained.

When the steam turbine stops while the high-pressure oil pump 12 is in operation, almost no control oil from the high-pressure oil pump 1 flows to the electro-hydraulic control device of the steam turbine, but instead passes through the flow rate adjustment valve 20 of the oil cleaning line 19 and the check valve. 21 to the oil cleaning filter 22, and then returned to the oil tank 13 through the oil cooler 18. At this time, the pressurized oil from the high-pressure oil pump 12 is controlled by the flow control valve 20 so that a constant amount always flows through the oil cleaning line 19, and therefore a constant amount of oil is reliably supplied to the oil cooler 18. You will be swept away. Further, since the check piece 25 is provided, the oil in the oil cleaning line 19 that has passed through the check valve 21 does not flow into the circulation line 23.

Since a constant amount of oil flowing in the oil cleaning line 19 is reliably guided to the oil cooler 18, the heat generated in the high-pressure oil pump 12 is reliably removed by the oil cooler 18.

Therefore, even if the steam turbine is stopped and the high perspiration oil pump 12 is operated, the temperature of the oil flowing in the oil cleaning line 19 does not rise, and temperature-related illnesses in the control oil can be prevented.

Next, while the high-pressure oil pump 12 is in operation, for example, the flow rate adjustment valve 2
The case where 0 fails will be explained. High pressure oil pump 12
If, for example, the flow regulating valve 20 fails during operation, the oil in the oil cleaning line 19 will no longer be guided to the oil cleaning filter 22. Therefore, the oil pressure immediately upstream of the oil cleaning filter in the oil cleaning line 19 drops below the specified value. Then, the oil pressure detector 26 detects this oil pressure and outputs a start command signal A to the oil circulation pump 24, thereby automatically starting the oil circulation pump 24. At the same time, the oil pressure detector 14 outputs an alarm signal B to the alarm generator 27 to generate an alarm for "abnormality in oil cleaning line".

When the oil circulation pump 24 starts, the check valve 25 is pushed open, and the pressurized oil from the oil circulation pump 24 passes through the oil cleaning filter 2.
Sent to 2. The pressurized oil from the oil circulation pump 24 is
Because of the presence of the check valve 21, the oil does not flow into the high pressure oil pump 1 side, and the fully opened oil is guided to the oil circulation filter 22. As a result, the oil in the oil tank 13 serving as the control oil has its cleanliness and chemical stability suitably maintained by the oil cleaning filter 22, and deterioration of the oil can be prevented.

When the oil circulation pump 24 is activated, the amount of oil guided to the oil circulation filter 22 is secured, so that the oil pressure immediately upstream of the oil circulation filter 22 in the oil cleaning line 19 is restored to a specified value or higher. Therefore, the "-J oil cleaning line abnormality" alarm on the alarm generator 27 is reset. At this point, the oil circulation pump 271 continues to be activated.

By the way, while the steam turbine is stopped, the high pressure oil pump 12
Driving t! Since there is no need to keep the oil in the oil tank 13 to the oil cleaning filter 22, the high-pressure oil pump 12 can be stopped and the oil circulation pump 24 can be started to guide the oil in the oil tank 13 to the oil cleaning filter 22. However, with the conventional high-pressure oil IF system shown in Fig. 2, it is necessary to manually close the stop valve 5 and listen to the stop valve 8 at the site when switching the pump. The switching work between the high-pressure oil pump 1 and the oil circulation pump 7 is always complicated. This tendency is particularly noticeable in the current situation where steam turbines are started and stopped on a daily basis.

In contrast, in this embodiment, a check valve 21 is installed in the oil cleaning line 19 and a check valve 25 is installed in the circulation line 23, so that when the steam turbine stops while the high-pressure oil pump 12 is operating, By simply stopping the high-pressure oil pump 12 and starting the oil circulation pump 24, the pressurized oil from the oil circulation pump 24 can be guided to the oil cleaning filter 22 without flowing back to the high-pressure oil pump 12 side. Switching can be easily performed.

Furthermore, this pump switching may be controlled so that the operation 0 directly stops the high-pressure oil pump 12 and starts the oil circulation pump 24, but it is sufficient to simply stop the high-pressure oil pump 12. In other words, in this embodiment, since the oil pressure detector 26 is installed, when the high pressure oil pump 12 is stopped, the oil purification line 19 (the oil purification filter 22
Direct and second flow hydraulic pressure decreases. This is because the oil pressure detector 26 then outputs the activation command signal A to the oil circulation pump 24, and the oil circulation pump 24 is automatically activated.

In this way, in this embodiment, the inverted l double valve 21 is simply
and 25, as well as an oil pressure detector 26, the pump switching operation can be done quickly and easily.

In the above embodiment, the oil cooler 18 installed in the post-system line 17 functions as a cooler for the oil purifying line 19. A cooler separate from the oil washing line 18 may be provided, and the downstream end of the oil washing line 19 may be connected to the oil tank 13.

〔Effect of the invention〕

As described above, according to the high-pressure oil pressure generating device according to the present invention, the oil in the oil tank is pressurized by the high-pressure oil pump, and is supplied as control oil to the electric/hydraulic control device of the turbine, and the high-pressure oil pump In a high-pressure hydraulic generator installed in such a way that a part of the pressurized oil from the pump is guided to an oil cleaning line, cleaned by an oil cleaning filter installed in the oil cleaning line, and returned to the oil tank, the oil cleaning A cooler is installed in the line downstream of the oil purifying filter, and the oil purified by the oil purifying filter is lowered and returned to the oil tank, so that the operation of the high pressure oil pump is reduced. Even if the turbine stops during operation, the oil temperature can be lowered by the cooler, preventing the temperature of the control oil supplied to the turbine's electricity/oil controller from rising.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of a high-pressure oil pressure generator according to the present invention, and FIG. 2 is a system diagram showing a conventional high-pressure oil pressure generator. 11... High pressure oil pressure generator, 12... High pressure oil pump, 13... Oil tank, 14... System column line, 17
...System return line, 18...Oil cooler, 19...
Oil cleaning line, 2 tons... Check valve, 22... Oil cleaning filter, 24... Oil circulation pump, 25... Check valve,
26...Oil pressure detector. Applicant's agent Hisashi Hatano 61

Claims (1)

[Claims] The oil in the oil tank is pressurized by a high-pressure oil pump and supplied as control oil to the electric/hydraulic control device of the turbine, and a portion of the pressurized oil from the high-pressure oil pump is guided to the oil cleaning line to clean the oil. In a high-pressure hydraulic generator that is installed to clean the oil with an oil cleaning filter installed in the line and return it to the oil tank, a cooler is installed in the oil cleaning line downstream of the oil cleaning filter, and the oil A high-pressure oil pressure generator characterized by being configured to lower the temperature of oil cleaned by a cleaning filter and return it to an oil tank.