Method for monitoring water mixed with oil in oil tank of hydraulic generating set

Abstract

The application discloses a water turbine generator set derived oil tank oil mixed water monitoring method, which comprises a first water content detection device installed on a derived oil tank outlet pipeline and a second water content detection device installed on a derived oil tank inlet pipeline, and the water content difference between the second water content detection device and the first water content detection device is used for judging the derived oil tank water leakage degree. The application can greatly improve the sensitivity and accuracy of the oil tank oil mixed water monitoring, can timely send an alarm signal in the initial stage of water leakage, can timely take measures to isolate the fault equipment, and can avoid the expansion of the accident.

Description

[0001] The application is a divisional application of "Derivation oil tank oil mixed water monitoring device and method for vertical shaft semi-umbrella type hydroelectric generator set" (application number: 2023102787434; filing date: 2023-03-21). TECHNICAL FIELD

[0002] The application belongs to the technical field of derivation oil tank oil mixed water monitoring of hydroelectric generator sets, and particularly relates to a derivation oil tank oil mixed water monitoring method for a hydroelectric generator set. BACKGROUND

[0003] The vertical shaft, semi-umbrella type hydroelectric generator set is arranged with upper guide, lower guide, thrust pad and other bearings from top to bottom. The thrust pad is arranged below the generator rotor and needs to bear the weight of the rotating part of the hydroelectric generator set and the axial water thrust acting on the runner. As a key component of the hydroelectric generator set, it is particularly important to maintain good cooling and lubrication. Therefore, a derivation oil tank is arranged below the generator rotor to immerse the thrust pad and its contact surface with the rotating part in oil; at the same time, an external water cooler is arranged to extract the oil in the derivation oil tank, cool it and then re-enter the oil tank for circulation.

[0004] In order to ensure the safe operation of the thrust pad, the monitoring of the oil quality in the derivation oil tank is also very important; the water power plant usually uses water as the cooling medium, and the most common problem is that water entering the oil tank causes the oil quality to deteriorate, thereby damaging the bearing pad. Therefore, a timely and accurate method is needed to monitor whether the oil tank has entered water.

[0005] The current monitoring method is to install a water detection sensor in the oil tank, but when the water detection sensor reaches the alarm threshold, the amount of water seepage in the oil tank has already been very serious. Therefore, the current monitoring method cannot timely discover the water seepage situation, the reaction is not timely, and the water content (oil mixed water) in the entire oil tank reaches a certain value to issue an alarm signal, which is very lagging, not sensitive, and cannot discover the problem as early as possible. SUMMARY

[0006] In view of the technical problems existing in the background art, the derivation oil tank oil mixed water monitoring method for a hydroelectric generator set provided by the application can greatly improve the sensitivity and accuracy of oil tank oil mixed water monitoring, timely issue an alarm signal at the initial stage of water leakage, timely take measures to isolate the faulty equipment, and avoid the expansion of accidents.

[0007] In order to solve the above technical problems, the application adopts the following technical solutions to achieve:

[0008] The application discloses a kind of water turbine generator unit derivation oil groove oil mixed water monitoring method, using a kind of derivation oil groove oil mixed water monitoring device, the derivation oil groove oil mixed water monitoring device including first moisture content detection device installed on derivation oil groove outlet pipeline, and second moisture content detection device installed on derivation oil groove inlet pipeline, the moisture content difference of second moisture content detection device and first moisture content detection device is used to judge derivation oil groove leakage degree;

[0009] The first moisture content detection device includes a first U-shaped tube and a first pressure reducing valve, and the second moisture content detection device includes a second U-shaped tube and a second pressure reducing valve.

[0010] The first moisture content detection device and the second moisture content detection device are both moisture content detection devices, and the moisture content detection device includes a transparent box, an iodine tungsten lamp is installed on one side of the transparent box, a photovoltaic panel is installed on the other side of the transparent box, the iodine tungsten lamp and the photovoltaic panel are oppositely arranged, and the photovoltaic panel is connected in series with an ammeter and an indicating device to form an electric circuit.

[0011] The monitoring method comprises the following steps:

[0012] Step 1: turn on the circulating oil pump on the derivation oil groove outlet pipeline, adjust the sizes of the first pressure reducing valve and the second pressure reducing valve, so that the oil fills the transparent box and the oil in the transparent box is not disturbed; the first U-shaped tube and the second U-shaped tube are used to introduce less oil into the transparent box, and the first pressure reducing valve and the second pressure reducing valve are used to avoid the oil in the transparent box flowing too fast to generate bubbles.

[0013] Step 2: turn on the iodine tungsten lamp, and the photovoltaic panel will generate direct current when receiving light; when the oil does not contain water, the direct current is a stable value.

[0014] Step 3: when the water in the cooler enters the oil pipe, the oil and water mixture will appear milky white, which will block the light transmittance of the oil, thereby affecting the power generation of the photovoltaic panel; when the current difference detected by the first moisture content detection device and the second moisture content detection device is greater than a threshold value, it is proved that the water in the cooler enters the oil pipe.

[0015] Preferably, the first U-shaped tube is connected in parallel to the outlet pipeline, and the first U-shaped tube is provided with the first pressure reducing valve and the first moisture content detection device; one end of the second U-shaped tube is connected to the inlet pipeline, and the other end of the second U-shaped tube is connected to the derivation oil groove; the second U-shaped tube is provided with the second pressure reducing valve and the second moisture content detection device.

[0016] Preferably, the first moisture content detection device and the second moisture content detection device have the same structure and are both moisture content detection devices, and the moisture content detection device includes a transparent box, an iodine tungsten lamp is installed on one side of the transparent box, a photovoltaic panel is installed on the other side of the transparent box, the iodine tungsten lamp and the photovoltaic panel are oppositely arranged, and the photovoltaic panel is connected in series with an ammeter and an indicating device to form an electric circuit.

[0017] Preferably, the transparent box is a square box, and the other faces of the transparent box, except the four faces of the iodine-tungsten lamp and the photovoltaic panel, are provided with light shielding plates.

[0018] Preferably, the indicating device is a fan or a light.

[0019] Preferably, the ammeters of the first water content detecting element and the second water content detecting element are electrically connected with the analog quantity processing module, and the analog quantity processing module is used for calculating the current values of the two ammeters and calculating the difference between the two ammeters.

[0020] Preferably, the first pressure reducing valve is located at the process rear end of the first water content detecting element, and the second pressure reducing valve is located at the process rear end of the second water content detecting element.

[0021] Preferably, a filter is arranged on the inlet pipeline.

[0022] The present application can achieve the following beneficial effects:

[0023] The present application can monitor the water content before and after entering the cooler, so as to monitor whether the oil pipe leaks water. Because the great possibility of water entering the oil tank is derived from the cooler. After the technical improvement of the present application, the detection sensitivity is greatly improved, and when a fault occurs, the water leakage fault can be quickly monitored. The sensitivity and accuracy of the oil tank oil mixed water monitoring can be greatly improved, an alarm signal can be sent in the early stage of water leakage, and isolation measures can be taken in time to isolate the fault equipment and avoid accident expansion.

[0024] The present application can solve the problem of inaccurate sampling of the monitoring device, can find the water leakage part causing the oil tank oil mixed water in time, and can take isolation measures in time. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in combination with the drawings and embodiments:

[0026] Figure 1 The present application is a system diagram;

[0027] Figure 2 The present application is a working principle diagram of the water content detecting element;

[0028] Figure 3 The present application is a working principle diagram of the existing technology deducing oil tank;

[0029] Figure 4 The present application is a change curve diagram between the current and time of the first water content detecting device and the second water content detecting device under normal conditions;

[0030] Figure 5 The present application is a change curve diagram between the current and time of the first water content detecting device and the second water content detecting device under water entering conditions.

[0031] In the diagram: 1. Oil tank; 2. Cooler; 3. Oil pump; 4. First moisture content detection device; 4. First U-tube; 401. First pressure reducing valve; 402. Second moisture content detection device; 5. Second U-tube; 501. Second pressure reducing valve; 502. Moisture content detection component; 6. Transparent box; 601. Iodine tungsten lamp; 602. Photovoltaic panel; 603. Filter; 7. Analog quantity processing module; 8. Traditional moisture content detection sensor; 9. Detailed Implementation

[0032] Example 1:

[0033] Preferred solutions include Figures 1 to 2 As shown, a method for monitoring water mixing in the oil tank of a hydro-generator unit employs a water mixing monitoring device. This device includes a first water content detection device 4 installed on the outlet pipe of the oil tank 1, and a second water content detection device 5 installed on the inlet pipe of the oil tank 1. The difference in water content between the second water content detection device 5 and the first water content detection device 4 is used to determine the degree of leakage in the oil tank 1. This invention moves the water content detection device to the oil pipe. Since the cross-sectional area of ​​the oil pipe is much smaller than that of the oil tank 1, the water content detection is more sensitive. Furthermore, the monitoring principle of this invention is to monitor the water content before and after entering the cooler, thereby monitoring whether the oil pipe is leaking. This is because the most likely source of water entering the oil tank is the cooler. Through the technical improvements of this invention, the detection sensitivity is greatly improved, enabling rapid detection of water ingress faults when they occur.

[0034] Furthermore, traditional moisture content detection sensors are limited to the area where the sensor probe contacts the oil. When the moisture content is low, they cannot quickly detect moisture. Therefore, this invention proposes an improved moisture content detection solution:

[0035] The first moisture content detection device 4 includes a first U-shaped tube 401, which is connected in parallel to the outlet pipe. A first pressure reducing valve 402 and a first moisture content detection element are installed on the first U-shaped tube 401. The second moisture content detection device 5 includes a second U-shaped tube 501, one end of which is connected to the inlet pipe and the other end is connected to the push oil tank 1. A second pressure reducing valve 502 and a second moisture content detection element are installed on the second U-shaped tube 501. The first and second moisture content detection elements have the same structure and are both moisture content detection elements 6. The moisture content detection element 6 includes a transparent box 601. An iodine tungsten lamp 602 is installed on one side of the transparent box 601, and a photovoltaic panel 603 is installed on the other side of the transparent box 601. The iodine tungsten lamp 602 and the photovoltaic panel 603 are arranged opposite to each other. The photovoltaic panel 603 is connected in series with an ammeter and indicating equipment to form an electrical circuit.

[0036] The photovoltaic panel 603 is arranged opposite to the iodine tungsten lamp 602, and the light irradiation area is larger than that of a conventional water content detection sensor. When the oil contains water, a milky white liquid is formed, which blocks the light and causes a change in the current. The water content is monitored by using the current change value, and the detection sensitivity is greatly improved. In order to avoid the interference of sunlight on the detection result, the application adds a light shield plate for shielding sunlight or other light. Specifically, the transparent box 601 is a square box, and the light shield plate is arranged on the other surfaces of the transparent box 601, that is, the four surfaces except the iodine tungsten lamp 602 and the photovoltaic panel 603.

[0037] Further, the indicating device on the electric circuit is a fan or a lamp. For example, the brightness of the lamp can play a local display role.

[0038] The ammeters of the first water content detection member and the second water content detection member are electrically connected with the analog quantity processing module 8, and the analog quantity processing module is used for calculating the current value of the two ammeters and calculating the difference value of the two ammeters. The analog quantity processing module 8 can be a PLC controller.

[0039] The first pressure reducing valve 402 is located at the process rear end of the first water content detection member, and the second pressure reducing valve 502 is located at the process rear end of the second water content detection member. The first pressure reducing valve 402 and the second pressure reducing valve 502 are used for slowing down the flow rate and reducing the generation of bubbles; at the same time, the transparent box 601 is ensured to be in a full state.

[0040] Further, a filter 7 is arranged on the inlet pipeline. The filter is used for filtering impurities to avoid the interference of the impurities on the detection result.

[0041] The monitoring method of the oil mixed water monitoring device of the vertical shaft semi-umbrella type hydroelectric generator set derivation oil tank comprises the following steps:

[0042] Step one, turn on the circulating oil pump on the outlet pipeline of the derivation oil tank 1, adjust the sizes of the first pressure reducing valve 402 and the second pressure reducing valve 502, so that the oil fills the transparent box 601, and the oil in the transparent box 601 does not appear disturbance; the first U-shaped pipe 401 and the second U-shaped pipe 501 are used for introducing less oil into the transparent box 601, and the first pressure reducing valve 402 and the second pressure reducing valve 502 are used for avoiding the flow rate of the oil in the transparent box 601 being too fast to appear bubbles;

[0043] Step two, turn on the iodine tungsten lamp 602, and the photovoltaic panel 603 will generate direct current when receiving light. When the oil does not contain water, the direct current is a stable value, and the current I changes with time T as shown in the following figure. Figure 4 The stable value is a relatively stable curve, but not an absolutely horizontal straight line.

[0044] Step three, when the water of the cooler enters into the oil pipe, the oil and water mixing will appear milky white, the milky white will block the light transmittance of the oil, thereby affecting the power generation of the photovoltaic panel, when the current difference detected by the first water content detection piece and the second water content detection piece is greater than the threshold value, it proves that the cooler water enters into the oil pipe. The current I changes with time T curve is shown in Figure 5 .

[0045] The above-described embodiments are merely preferred technical solutions of the present application, and should not be regarded as a limitation on the present application. The protection scope of the present application should be based on the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A method for monitoring the water-oil mixture in the derivation oil groove of a hydroelectric generating unit, characterized by: The application discloses a deduced oil tank oil mixed water monitoring device, which comprises a first water content detection device (4) installed on an outlet pipeline of a deduced oil tank (1) and a second water content detection device (5) installed on an inlet pipeline of the deduced oil tank (1), and the water content difference between the second water content detection device (5) and the first water content detection device (4) is used for judging the water leakage degree of the deduced oil tank (1). The first water content detection device (4) comprises a first U-shaped pipe (401) and a first pressure reducing valve (402), and the second water content detection device (5) comprises a second U-shaped pipe (501) and a second pressure reducing valve (502). The first water content detection device (4) comprises the first U-shaped pipe (401) which is connected in parallel to the outlet pipeline, and the first U-shaped pipe (401) is provided with the first pressure reducing valve (402) and a first water content detection element; the second water content detection device (5) comprises the second U-shaped pipe (501), one end of the second U-shaped pipe (501) is connected with the inlet pipeline, the other end of the second U-shaped pipe (501) is connected with the deduced oil tank (1), and the second U-shaped pipe (501) is provided with the second pressure reducing valve (502) and a second water content detection element. The first water content detection element and the second water content detection element are the same in structure and are both water content detection elements (6), the water content detection element (6) comprises a transparent box (601), one side of the transparent box (601) is provided with an iodine tungsten lamp (602), the other side of the transparent box (601) is provided with a photovoltaic panel (603), the iodine tungsten lamp (602) and the photovoltaic panel (603) are oppositely arranged, and the photovoltaic panel (603) is connected with an ammeter and an indicating device to form an electric circuit. The monitoring method comprises the following steps: Step one, a circulating oil pump on the outlet pipeline of the deduced oil tank (1) is started, the sizes of the first pressure reducing valve (402) and the second pressure reducing valve (502) are adjusted, the oil fills the transparent box (601), and the oil in the transparent box (601) is not disturbed; the first U-shaped pipe (401) and the second U-shaped pipe (501) are used for leading less oil into the transparent box (601), and the first pressure reducing valve (402) and the second pressure reducing valve (502) are used for avoiding the oil in the transparent box (601) from flowing too fast to generate bubbles; Step two, the iodine tungsten lamp (602) is started, the photovoltaic panel (603) generates direct current when receiving light, and the direct current is a stable value when the oil does not contain water; Step three, when the water of the cooler enters the oil pipeline, the oil and the water are mixed to generate a milky white color, the milky white color blocks the light transmittance of the oil, thereby affecting the power generation of the photovoltaic panel, and when the current difference detected by the first water content detection element and the second water content detection element is greater than a threshold value, it is proved that the water of the cooler enters the oil pipeline.

2. The method of claim 1, wherein the method is characterized by: The transparent box (601) is a square box, and the other four sides of the transparent box (601) are provided with light shielding plates.

3. The method of claim 1, wherein: The indicating device is a fan or a lamp.

4. The method of claim 1, wherein: The ammeters of the first water content detecting member and the second water content detecting member are electrically connected with the analog quantity processing module (8), which is used for calculating the current values of the two ammeters and calculating the difference between the two ammeters.

5. The method of claim 1, wherein: The first pressure reducing valve (402) is located at the process rear end of the first water content detecting member, and the second pressure reducing valve (502) is located at the process rear end of the second water content detecting member.

6. The method of claim 1, wherein: A filter (7) is arranged on the inlet pipeline.

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