Large hydroelectric generator set runner water state detection system and method

Abstract

The application discloses a large-scale water turbine generator set runner water state detection system and method, which comprises a spiral case drainage valve installed on a pipeline, one end of a three-way valve installed on one side of the spiral case drainage valve away from a spiral case drainage section, two other ends of the three-way valve respectively connected with a draft tube and a valve, one end of the valve connected with a cavity pipeline, a pressure relief emptying valve arranged on the cavity pipeline, the other end of the cavity pipeline detachably connected with a first baffle plate, a through hole arranged on the first baffle plate, a cable docking disc or a second baffle plate sealingly installed at the through hole, a cable arranged on the cable docking disc, one end of the cable connected with a control device, the other end of the cable connected with a winding unit, the winding unit connected with an underwater robot, the winding unit in communication with the underwater robot, underwater movement and detection of the underwater robot controlled according to a control signal of the control device, and the cable reeled in and out synchronously controlled. The application only needs to stop the water turbine generator set, does not need to stop other equipment, has a short construction period, does not involve high-risk operation and has a high safety factor.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator equipment testing technology, specifically, to a system and method for detecting the water status of the runner of a large hydro-generator. Background Technology

[0002] The turbine runner is the core equipment of a hydro-generator unit, and its condition determines whether the unit can operate normally. Therefore, external monitoring is necessary. However, because the runner rotates at high speed and adjacent components are exposed to rapid water flow, real-time monitoring is impossible. Existing technologies sometimes use indirect monitoring methods such as vibration and noise, which not only provide indirect data but are also prone to generating erroneous interference signals, failing to accurately describe the true condition of the runner. Another method involves erecting a runner inspection platform after the turbine has been drained to check for damage or cracks. The implementation process of this method is as follows:

[0003] (1) The unit is shut down and the turbine is drained;

[0004] (2) Open the volute entrance door and the cone-shaped entrance door;

[0005] (3) Erect a maintenance platform for the rotating wheel;

[0006] (4) Inspect the flaw detection wheel;

[0007] (5) Addressing defects in the runner;

[0008] (6) Dismantle the turbine maintenance platform;

[0009] (7) Close the volute entrance door and the cone tube entrance door;

[0010] (8) Fill the unit with water.

[0011] The above steps only cover the linear timeline for checking the turbine runner. Besides the runner inspection, the technical water supply system, spindle sealing system, and speed controller system also need to be taken out of service due to the runner inspection requirements. After these systems are put back into operation, testing and data adjustments need to be rearranged, involving numerous points and a wide scope of work, a long cycle, and requiring downtime days, thus affecting the equipment's equivalent availability factor. Furthermore, the above process involves working at heights, which carries a high risk factor. In summary, the existing method has the following drawbacks:

[0012] (1) The construction period is long, reaching more than 15 days.

[0013] (2) The volute and tailwater flow channels are slippery, the lighting is insufficient, the water mist is large, and there are many dangerous factors.

[0014] (3) Setting up a rotating maintenance platform involves working at heights, and the risk factor is even greater under the superposition of the conditions in (2).

[0015] (4) There are many accompanying shutdown devices, which seriously affect the unit's power generation time.

[0016] In summary, existing testing methods are time-consuming, labor-intensive, and have a high risk factor, which seriously affects the operating time of hydro-generator units. Summary of the Invention

[0017] The purpose of this invention is to provide a system and method for detecting the water status of a large hydro-generator runner, which solves the problems of long construction period and high risk factor in the existing technology of using a runner maintenance platform after the turbine is drained.

[0018] The present invention solves the above problems through the following technical solution:

[0019] A water status detection system for a large hydro-generator runner includes a spiral casing drain valve installed on a pipeline. A three-way valve is installed on one end of the spiral casing drain valve on the side away from the spiral casing drain section. The other two ends of the three-way valve are connected to a tailrace pipe and a valve, respectively. The valve is connected to one end of a hollow pipe. A pressure relief and venting valve is installed on the hollow pipe. A first blocking plate is detachably connected to the other end of the hollow pipe. The first blocking plate has a through hole. A cable reel or a second blocking plate is sealed at the through hole. A cable is mounted on the cable reel. One end of the cable is connected to a control device, and the other end is connected to a winding unit. The winding unit is connected to an underwater robot and communicates with the underwater robot. Based on the control signals from the control device, the winding unit controls the underwater robot's underwater movement and detection, and simultaneously controls the cable's deployment and retraction.

[0020] A method for detecting the water status of a large hydro-generator runner using a large hydro-generator runner water status detection system includes:

[0021] Step S100: Shut down the hydro-generator unit, close the valves, and open the pressure relief and venting valve;

[0022] Step S200: Install a cable reel at the through hole of the first blocking plate, connect the two ends of the cable to the winding unit and the control device respectively, put the underwater robot and the winding unit into the cavity pipe, and install the first blocking plate in the cavity pipe.

[0023] Step S300: Close the pressure relief and venting valve, and slowly open the valve;

[0024] Step S400: The control device controls the underwater robot to swim to the designated position for detection through the winding unit, and the winding unit synchronously controls the winding and unwinding of the cable;

[0025] Step S500: The underwater robot inspection is completed. The control equipment controls the underwater robot to swim to the cavity pipe through the winding unit. The winding unit synchronously controls the winding and unwinding of the cable.

[0026] Step S600: Close the valve, open the pressure relief and venting valve, remove the first plug plate, take out the underwater robot and winding unit, remove the cable reel, install the second plug plate at the through hole, install the first plug plate in the cavity pipe and close the pressure relief and venting valve at the same time.

[0027] After the unit shuts down, there is no need to drain the tailrace or open the spiral casing inlet door or cone inlet door. A valve, hollow pipe, and plug are installed at the tee position connecting the spiral casing drain valve to the tailrace. Close the valve, remove the plug, and place the underwater robot into this hollow pipe. The underwater control cable passes through the plug to connect the underwater robot and control equipment. Install the cable reel, which is sealed to prevent leakage after filling with water. Close the pressure relief valve, slowly open the valve, and operate the control equipment to allow the underwater robot to swim along the spiral casing drain pipe to the impeller detection position inside the tailrace pipe. The winding unit and the underwater robot move together as a single unit. The winding unit receives signals from the underwater robot and swims with the robot, synchronously winding and unwinding the control cable. The underwater robot can be equipped with lighting elements, high-definition cameras, ultrasonic probes, and other detection equipment as needed. Operators operate the underwater robot control equipment to perform point-to-point and positional inspections of the impeller and other flow-through components. After the inspection is completed, operate the underwater robot control equipment to guide the underwater robot back along the volute drain pipe to the cavity pipe at the plug flange and valve. Simultaneously, the winding unit retrieves the control cable and closes the valve. Once the valve is fully closed, open the pressure relief valve to drain the water from the cavity, open the first plug plate, disassemble the cable reel, and remove the underwater robot. Finally, reinstall the first plug plate, install the second plug plate to seal the cable reel mounting hole, and close the pressure relief valve.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] (1) This invention only requires the turbine generator set to be shut down, without the need for other equipment to be shut down. It has a short construction period, does not involve high-risk operations, and has a high safety factor.

[0030] (2) This invention proposes a system and method for detecting the water status of a large hydro-generator runner. An underwater robot is deployed from an existing pipeline into the tailrace. The underwater robot can swim from the existing pipeline to the tailrace pipe and then into the space between the runner blades to detect the runner status in detail. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure in the working state of the present invention;

[0032] Figure 2This is a schematic diagram of the structure of the present invention in its completed state;

[0033] Figure 3 This is a flowchart of the present invention;

[0034] Among them, 1-pipe; 2-volute drain valve; 3-three-way valve; 4-valve; 5-pressure relief and venting valve; 6-cable reel; 7-control equipment; 8-first blocking plate; 9-flow component; 10-tailwater pipe; 11-cable; 12-underwater robot; 13-winding unit; 14-hollow pipe. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0036] Example 1:

[0037] Combined with appendix Figure 1 and Figure 2 As shown, a water status detection system for a large hydro-generator runner includes a spiral casing drain valve 2 installed on a pipe 1. A three-way valve 3 is installed on one end of the spiral casing drain valve 2 away from the spiral casing drainage section. The other two ends of the three-way valve 3 are respectively connected to a tailrace pipe 10 and a valve 4. The valve 4 is connected to one end of a hollow pipe 14. A pressure relief and venting valve 5 is installed on the hollow pipe 14. A first blocking plate 8 is detachably connected to the other end of the hollow pipe 14. The first blocking plate 8 has a through hole. A cable reel 6 or a second blocking plate is sealed at the through hole. A cable 11 is installed on the cable reel 6. One end of the cable 11 is connected to a control device 7, and the other end of the cable 11 is connected to a winding unit 13. The winding unit 13 is connected to an underwater robot 12. The winding unit 13 communicates with the underwater robot 12, controlling the underwater movement and detection of the underwater robot 12 according to the control signal from the control device 7, and simultaneously controlling the winding and unwinding of the cable 11. The winding unit 14 can be connected to the underwater robot 12 to achieve synchronous movement, obtain the direction of movement through communication, and realize the winding or unwinding of the cable through its own rotating shaft.

[0038] Example 2:

[0039] Based on Example 1, combined with Figures 1-3 As shown, the method for detecting the water state of the runner of a large hydro-generator unit includes:

[0040] Step S100: Shut down the hydro-generator unit, close valve 4, and open the pressure relief and venting valve 5;

[0041] Step S200: Install cable tray 6 at the through hole of the first blocking plate 8, connect the two ends of the cable to the winding unit 13 and the control device 7 respectively, put the underwater robot 12 and the winding unit 13 into the cavity pipe 14, and install the first blocking plate 8 in the cavity pipe 14.

[0042] Step S300: Close the pressure relief valve 5 and slowly open the valve 4;

[0043] In step S400, the control device 7 controls the underwater robot 12 to swim to the designated position through the winding unit 13 to inspect the turbine and other flow-through components 9. The winding unit 13 synchronously controls the winding and unwinding of the cable 11.

[0044] Step S500: The underwater robot 12 has completed the test. The control device 7 controls the underwater robot 12 to swim to the cavity pipe 14 through the winding unit 13. The winding unit 13 synchronously controls the winding and unwinding of the cable 11.

[0045] Step S600: Close the valve, open the pressure relief and venting valve 5, remove the first plug plate 8, take out the underwater robot 12 and the winding unit 13, remove the cable reel 6, install the second plug plate at the through hole, install the first plug plate 8 in the cavity pipe 14, and simultaneously close the pressure relief and venting valve 5.

[0046] This invention enables the detection of the turbine-generator runner in a water-bearing state without shutting down the turbine tailrace, the spiral casing inlet door, the cone pipe inlet door, the technical water supply system, or the main shaft sealing system. It has the following main advantages:

[0047] 1. Minimal accompanying equipment required. This invention involves inserting an underwater robot to inspect flow-through components such as the turbine runner through a tee installed after the drain valve on the volute. This inspection method only requires the unit to be shut down and does not require any other equipment to be shut down.

[0048] 2. Short construction period: This method uses a tee installed after the drain valve on the volute to insert an underwater robot to inspect the runner and other flow-through components. It eliminates the need for turbine drainage, opening the volute and conical pipe access doors, and setting up a runner maintenance platform. With underwater robot inspection, the entire runner inspection can typically be completed in about one day.

[0049] 3. Fewer staff required: Since this method does not require the construction of a turbine maintenance platform, only two people are needed to operate the valve installed on the tee after the volute drain pipe, disassemble and install the plug, and operate and control the underwater robot to complete the inspection of the entire turbine.

[0050] 4. High safety factor: This method does not require the construction of a disassembly and maintenance platform for the turbine in the slippery casing and turbine chamber, and does not involve working at heights. Workers only work near the drain pipe of the casing in the tailrace corridor, which provides a good working environment and a high safety factor.

[0051] 5. The test results are accurate and reliable. Lighting elements, high-definition cameras, ultrasonic probes and other equipment can be installed on the underwater robot as needed to visually detect defects such as wheel cracks and cavitation.

[0052] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A large hydroelectric generator unit runner water state detection system, characterized by, The utility model provides a kind of pipeline installation volute drain valve, one end of three-way valve is installed on the volute drain valve away from the side of volute drain section, another two ends of the three-way valve are communicated tail pipe and valve respectively, one end of the cavity pipeline is communicated with the valve, pressure relief emptying valve is arranged on the cavity pipeline, the other end of the cavity pipeline is detachably connected with first baffle, the first baffle is equipped with through hole, cable docking tray or second baffle is sealingly installed at the through hole, cable docking tray is equipped with cable, one end of the cable is connected with control equipment, the other end of the cable is connected with winding unit, the winding unit is connected with underwater robot, winding unit and underwater robot communicate, underwater movement and detection of underwater robot are controlled according to control signal of the control equipment, and cable is controlled simultaneously.

2. A method for detecting the water state of the runner of a large hydroelectric generating unit using the system for detecting the water state of the runner of a large hydroelectric generating unit according to claim 1, characterized in that, It comprises: Step S100, water turbine generator set is stopped, valve is closed, and pressure relief emptying valve is opened; Step S200, cable docking tray is installed at the through hole of first baffle, two ends of cable are connected with winding unit and control equipment respectively, underwater robot and winding unit are placed into cavity pipeline, and first baffle is installed in cavity pipeline; Step S300, pressure relief emptying valve is closed, and valve is slowly opened; Step S400, control equipment controls underwater robot to swim to specified position for detection by winding unit, and winding unit controls cable reeling simultaneously; Step S500, underwater robot detection is completed, control equipment controls underwater robot to swim to cavity pipeline by winding unit, and winding unit controls cable reeling simultaneously; Step S600, valve is closed, pressure relief emptying valve is opened, first baffle is disassembled, underwater robot and winding unit are taken out, cable docking tray is removed, second baffle is installed at the through hole, first baffle is installed in cavity pipeline, and pressure relief emptying valve is closed simultaneously.

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