Water turbine generator set speed regulating system capable of remotely controlling air supply

Abstract

The utility model discloses a water turbine generator set speed regulating system capable of remotely controlling air supply, which belongs to the technical field of water turbine generator sets and comprises an oil pressing tank and an air supply tank. A conduction adjusting device is arranged between the oil pressing tank and the gas supplementing tank; the air supplementing tank supplements air pressure to the oil pressing tank through the conduction adjusting device; the conduction adjusting device comprises a manual adjusting line system and an automatic adjusting line system which are used for achieving manual air supply and automatic air supply of the hydraulic turbine set speed adjusting system respectively. The manual adjusting line system and the automatic adjusting line system are each provided with a remote control device, and the remote control devices control connection and disconnection of the line system between the gas supplementing tank and the oil pressing tank. The automatic gulp valve can effectively solve the problems that in the prior art, an automatic gulp valve breaks down, the valve is opened for a long time, air pressure in an oil pressing tank is gradually increased, and a series of potential safety hazards are caused.

Description

Technical Field

[0001] The utility model belongs to the technical field of water turbine generator sets, and specifically relates to a water turbine generator set speed regulating system capable of remotely controlling air replenishment. Background Art

[0002] In order to ensure that the pressure of the oil tank of the hydraulic system of the hydropower station governor is always within the normal range, the hydraulic system of the governor is usually equipped with an automatic air supply system. During normal operation, the automatic air supply electric valve of the oil tank is in a closed state, isolating the oil tank from the air system of the oil pressure device. When the automatic air supply conditions are met, the local PLC automatically opens the air supply electric valve to supply air to the oil tank.

[0003] For the hydraulic system of the speed regulator, there are generally two control methods for the automatic air supply electric valve, namely, local PLC automatic control and pure manual operation of the local electric valve body operating handle. However, when the automatic air supply electric valve has faults such as valve carding and abnormal position node feedback, the valve may be opened for a long time. When the pressure reaches the alarm value, an alarm message is sent to the monitoring system. At this time, personnel are required to rush to the site to take measures immediately. However, it takes a certain amount of time for personnel to arrive at the site. The rated working pressure of the gas system of the oil pressure device is higher than the action pressure of the oil pressure tank safety valve, resulting in a rapid increase in system pressure. After the pressure oil tank is over-pressured, the safety valve is activated, and the oil pressure system is depressurized, causing the low oil pressure protection logic of the speed regulator to operate and shut down, which is a huge safety risk. For power stations with large single-unit capacity (single-unit capacity greater than 200MW and above), this fault risk may not only cause large economic losses to the power production and operation of the power plant, but also pose a great potential threat to the safety and stability of the transmission network. Utility Model Content

[0004] The purpose of the utility model is to provide a turbine generator speed control system capable of remotely controlling air replenishment to address the above shortcomings, so as to solve the problems of a series of safety hazards caused by the failure of the automatic air replenishment valve in the prior art, which leads to the valve being open for a long time, and then the air pressure in the oil pressure tank gradually increases. To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A water turbine generator speed control system capable of remotely controlling air replenishment comprises an oil pressure tank and an air replenishment tank; a conduction regulating device is arranged between the oil pressure tank and the air replenishment tank; the air replenishment tank replenishes air pressure to the oil pressure tank through the conduction regulating device; the conduction regulating device comprises a manual regulating circuit system and an automatic regulating circuit system, respectively realizing manual air replenishment and automatic air replenishment of the water turbine speed control system; the manual regulating circuit system and the automatic regulating circuit system are both provided with a remote control device, controlling the on-off of the circuit system between the air replenishment tank and the oil pressure tank.

[0006] Furthermore, the automatic regulating line system includes a first pipeline and an automatic air supply valve, and an air supply tank, an automatic air supply valve and an oil pressure tank are arranged along the first pipeline respectively.

[0007] Furthermore, the manual adjustment line system includes a second pipeline and a manual air supply valve, and an air supply tank, a manual air supply valve and an oil pressure tank are arranged along the second pipeline respectively; the manual air supply valve is in a closed state during normal operation.

[0008] Furthermore, the front end portion of the first pipeline is overlapped with the front end portion of the second pipeline, the rear end portion of the first pipeline is overlapped with the rear end portion of the second pipeline, the automatic air supply valve is arranged in the middle portion of the first pipeline, the manual air supply valve is arranged in the middle portion of the second pipeline, and the automatic air supply valve and the manual air supply valve are arranged in parallel; the first pipeline and the second pipeline are provided with an air supply intake valve in the overlapping part of the rear section, which is in an open state during normal operation.

[0009] Furthermore, an internal check valve is provided on the middle section of the first pipeline and is arranged behind the automatic air supply valve along the gas transmission direction.

[0010] Furthermore, the remote control device includes an air intake cut-off valve and a control system; the control system can remotely control the air intake cut-off valve; and the air intake cut-off valve is arranged on the overlapping portion of the first pipeline and the front section of the second pipeline.

[0011] Furthermore, it also includes a third pipeline; a manual exhaust valve is provided on the third pipeline; one end of the third pipeline is connected to the overlapping part of the rear section of the first pipeline and the second pipeline, and is located in front of the air supply and intake valve, and the other end of the third pipeline is connected to the outside.

[0012] Furthermore, a pressure monitoring gauge is provided on the oil pressure tank; and a pressure gauge front valve is provided on the pipeline connecting the pressure monitoring gauge and the oil pressure tank.

[0013] Furthermore, the control system controls the air intake cut-off valve to periodically complete the automatic closing and opening procedures.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a turbine generator speed control system capable of remotely controlling air replenishment, the system can realize the air replenishment work of the oil pressure tank by automatic air replenishment and manual air replenishment, and the use of two systems can make the air replenishment method more flexible and improve the stability; when the automatic air replenishment valve of the hydraulic system of the turbine generator speed governor is stuck or the position node feedback is abnormal, the continuous air replenishment cannot be closed, resulting in the continuous increase of the oil pressure of the governor oil pressure tank, remote monitoring and timely intervention can be carried out, and emergency isolation measures can be taken to forcibly cut off the air intake of the oil pressure tank, so as to ensure the safe and reliable operation of large and medium-sized turbine generator sets and the safe and stable operation of the power transmission network; in addition, a program for the air intake cut-off valve to automatically close and switch periodically is set in the control system to improve the stability and reliability of the air intake cut-off valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is the control flow chart of the utility model;

[0018] In the attached figure: 10- oil pressure tank, 100- pressure monitoring gauge, 40- air intake cut-off valve, 400- automatic air supply valve, 403- manual air supply valve, 404- manual exhaust valve, 405- air supply intake valve, 406- pressure gauge front valve. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, but the present invention is not limited to the following embodiments.

[0020] See attached Figures 1-2. A speed control system for a turbine generator set capable of remotely controlling air replenishment, wherein a manual adjustment line system and an automatic adjustment line system are arranged between the air replenishment tank and the oil pressure tank 10, and automatic or manual control can be freely realized according to the needs on site. The automatic adjustment line system is composed of a first pipeline, and the two ends of the first pipeline are respectively connected to the air replenishment tank and the oil pressure tank 10, and an air intake shut-off valve 40, an automatic air replenishment valve 400, an internal check valve and an air replenishment intake valve 405 are arranged along the direction from the air replenishment tank to the oil pressure tank 10. The specific air replenishment process is as follows: when the system meets the air replenishment conditions, the local PLC controls the automatic air replenishment valve 400 to open, and the gas in the air replenishment tank flows through the first pipeline in sequence through the air intake shut-off valve 40, the automatic air replenishment valve 400, the internal check valve and the air replenishment intake valve 405 into the oil pressure tank 10 until the pressure in the oil pressure tank 10 returns to normal, and then the local PLC controls the air replenishment valve 400 to open. The automatic air supply valve 400 is closed, and the air supply is finished; the manual adjustment line system is composed of a second pipeline, and the two ends of the second pipeline are connected to the air supply tank and the pressure oil tank 10 respectively. An air intake stop valve, a manual air supply valve 403 and an air supply intake valve 405 are arranged along the direction from the air supply tank to the pressure oil tank 10. The specific air supply process is: the operator manually controls the manual air supply valve 403 to open, and the gas in the air supply tank flows through the air intake cut-off valve 40, the manual air supply valve 403 and the air supply intake valve 405 in sequence through the second pipeline into the pressure oil tank 10 until the pressure in the pressure oil tank 10 is normal, and the operator manually closes the manual air supply valve 403. The air intake cut-off valve 40 and the air supply intake valve 405 on the first pipeline and the second pipeline are always kept open during normal operation.

[0021] Parts of the first pipeline and the second pipeline can be overlapped, and the front and rear sections of the first pipeline and the second pipeline are set as one pipeline, and the air intake cut-off valve 40 and the air supply intake valve 405 are respectively set on the front section and the rear section of the pipeline, and the automatic air supply valve 400 and the internal check valve on the first pipeline are set in parallel with the manual air supply valve 403 on the second pipeline, which can be specifically realized by a three-way pipe. This setting further reduces the layout of the pipelines, and the number of the air intake cut-off valve 40 and the air supply intake valve 405.

[0022] The control system adopts the monitoring system, unit LCU and local PLC system commonly used in turbine generator sets in the prior art. When the automatic air supply valve 400 has valve jamming, abnormal position node feedback and other faults, the system pressure reaches the alarm value, and a high pressure alarm signal of the oil tank 10 is sent to the monitoring system. The monitoring system issues a command to close the air intake shutoff valve 40 to the unit LCU, and then sends it to the governor hydraulic system through the unit LCU. The governor hydraulic system is hard-wired to directly close the air intake shutoff valve 40 and stop supplying air to the oil tank 10. In order to test the success rate of the shutoff valve closure in the near future, a program is added to the local PLC program of the governor hydraulic system to control the electric valve to automatically close and open it regularly (once a month or once every 15 days).

[0023] The air intake cut-off valve 40 of the utility model is preferably a DF40 type solenoid valve, on which 1FC is a valve joint point and 2FC is a valve opening point, and different switching actions are achieved through control of the control system. The automatic air supply valve 400 is preferably a DF400 type solenoid valve, which includes an air intake end and two air outlet ends, as shown in the attached Figure 1 When the automatic air supply valve 400 is opened, nodes 2 and 3 are connected; when the automatic air supply valve 400 is closed, nodes 1 and 2 are connected, and an internal check valve is provided behind the automatic air supply valve 400.

[0024] One end of the third pipeline is connected to the overlapping part of the rear sections of the first pipeline and the second pipeline, and is located in front of the air supply and intake valve 405. The other end of the third pipeline is connected to the outside. A manual exhaust valve 404 is provided on the third pipeline, which is in a closed state under normal operating conditions. When the pressure tank needs to be exhausted, the exhaust is carried out by opening the manual exhaust valve 404. Before the manual exhaust valve 404 is opened, the manual air supply valve 403 is closed, and the manual exhaust valve 404 and the air supply and intake valve 405 are open.

[0025] A pressure monitoring gauge 100 is provided on the pressure tank to monitor the pressure status in the pressure oil tank 10 in real time. The setting of the pressure gauge front valve 406 can prevent the air pressure in the pressure tank from being too high, and close the pressure gauge front valve 406 in time to protect the pressure monitoring gauge 100.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0028] In the description of the present invention, "plurality" means two or more.

[0029] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0030] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A speed control system for a turbine generator set capable of remotely controlling air supply, characterized in that: The invention comprises an oil pressure tank (10) and an air supply tank; a conduction regulating device is arranged between the oil pressure tank (10) and the air supply tank; the air supply tank replenishes the air pressure to the oil pressure tank (10) through the conduction regulating device; the conduction regulating device comprises a manual regulating circuit system and an automatic regulating circuit system, respectively realizing manual air supply and automatic air supply of the turbine speed regulating system; the manual regulating circuit system and the automatic regulating circuit system are both provided with a remote control device, controlling the on-off of the circuit system between the air supply tank and the oil pressure tank (10).

2. A water turbine generator speed control system capable of remotely controlling air supply according to claim 1, characterized in that: The automatic regulating line system comprises a first pipeline and an automatic air supply valve (400), and an air supply tank, an automatic air supply valve (400) and an oil pressure tank (10) are arranged along the first pipeline respectively.

3. The speed regulating system for a hydraulic turbine generator set capable of remotely controlling air supply according to claim 2 is characterized in that: The manual adjustment line system comprises a second pipeline and a manual air supply valve (403), and an air supply tank, a manual air supply valve (403) and an oil pressure tank (10) are arranged along the second pipeline respectively; the manual air supply valve (403) is in a closed state during normal operation.

4. The speed regulating system for a water turbine generator set capable of remotely controlling air supply according to claim 3 is characterized in that: The front end portion of the first pipeline is arranged to overlap with the front end portion of the second pipeline, the rear end portion of the first pipeline is arranged to overlap with the rear end portion of the second pipeline, the automatic air supply valve (400) is arranged in the middle portion of the first pipeline, the manual air supply valve (403) is arranged in the middle portion of the second pipeline, and the automatic air supply valve (400) and the manual air supply valve (403) are arranged in parallel; the first pipeline and the second pipeline are provided with an air supply intake valve (405) at the overlapping portion of the rear end, which is in an open state during normal operation.

5. The speed regulating system for a water turbine generator set capable of remotely controlling air supply according to claim 4 is characterized in that: An internal check valve is provided on the middle section of the first pipeline and is arranged behind the automatic air supply valve (400) along the gas transmission direction.

6. The speed regulating system for a water turbine generator set capable of remotely controlling air supply according to claim 4 is characterized in that: The remote control device comprises an air intake cut-off valve (40) and a control system; the control system can remotely control the air intake cut-off valve (40); the air intake cut-off valve (40) is arranged on the overlapping portion of the first pipeline and the front section of the second pipeline.

7. The speed regulating system for a hydraulic turbine generator set capable of remotely controlling air supply according to claim 4 is characterized in that: It also includes a third pipeline; a manual exhaust valve (404) is provided on the third pipeline; one end of the third pipeline is connected to the overlapping part of the rear sections of the first pipeline and the second pipeline, and is located in front of the air supply and intake valve (405), and the other end of the third pipeline is connected to the outside.

8. The speed regulating system for a water turbine generator set capable of remotely controlling air supply according to claim 1 is characterized in that: The oil pressure tank (10) is provided with a pressure monitoring gauge (100); and a pressure gauge front valve (406) is provided on a pipeline connecting the pressure monitoring gauge (100) and the oil pressure tank (10).

9. The water turbine generator speed regulating system capable of remotely controlling air supply according to claim 6 is characterized in that: The control system controls the air intake cut-off valve (40) to regularly complete the automatic closing and opening procedures.

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