Energy accumulator device for inhibiting vibration of control oil pipeline of thermal turbine unit

Abstract

The utility model discloses an energy accumulator device for inhibiting vibration of a control oil pipeline of a thermal turbine unit, which belongs to the technical field of thermal turbines and comprises a pressure oil inlet, a pressure oil outlet connected with a hydraulic servo-motor, a one-way valve and two sets of energy accumulation mechanisms. The pressure oil outlet is connected with an oil outlet of the one-way valve, and the two energy storage mechanisms are connected to the oil outlet of the one-way valve in parallel and are redundant to each other. Each energy storage mechanism comprises a pressure oil stop valve, a leather bag type energy accumulator and an air supply monitoring assembly which are sequentially connected, one end of each pressure oil stop valve is connected with an oil cavity of the corresponding leather bag type energy accumulator, and the other end of each pressure oil stop valve is connected with an oil outlet of the corresponding one-way valve and the corresponding pressure oil outlet. The technical problems that due to response lag of a far-end control oil pump, the flow velocity of oil in a pipeline fluctuates, and flow supply is insufficient are solved, vibration of a control oil pipeline of the thermal turbine unit can be effectively restrained, and stability and safety of operation of the thermal turbine unit are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal turbines, and in particular relates to an accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit. Background Art

[0002] In order to maintain the stable operation of the power grid, the regulation system of the thermal turbine unit will monitor the power grid demand and unit status in real time, adjust the unit's output power according to the power grid frequency regulation demand, and control the frequent operation of the oil motor to open or close the regulating valve, thereby changing the steam intake to adapt to the rapid changes in the power grid load. However, since the control oil pump that provides pressure oil is usually arranged far away from the oil motor, when the oil motor is frequently operated, the remote control oil pump may not be able to respond in time and cannot provide sufficient flow of pressure oil, which will cause the oil pressure in the pipeline to fluctuate, and then cause frequent changes in the oil flow rate and high-frequency vibration, and finally cause the pipe joints to loosen. When the pipe joints loosen to a certain extent, it may cause oil leakage or even unit non-stop accidents.

[0003] At present, no relatively close prior art has been retrieved in the field of thermal turbine technology, but a Chinese patent document with a publication number of CN211144936U has been retrieved in the field of injection molding machines, which discloses an injection molding machine control oil pressure relief circuit. The patent document discloses that an accumulator and an electromagnetic directional valve are used to effectively maintain and relieve the control oil pressure. However, it is not applicable to the application scenario in which the oil motor in the thermal turbine regulation system frequently operates to participate in the frequency modulation of the power grid.

[0004] Therefore, in view of the working characteristics of the oil motor in the thermal turbine unit that frequently operates due to the frequency modulation requirements of the power grid, it is necessary to design a new type of accumulator device that can respond to the action of the oil motor in time and provide it with stable pressure oil that meets the flow requirements, so as to avoid frequent changes in oil flow rate and control oil pipeline vibration, prevent oil leakage or unit non-stop accidents caused by loose pipe joints, thereby improving the stability and safety of the thermal turbine unit operation. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art, and to provide an accumulator device for suppressing the vibration of the control oil pipeline of a thermal turbine unit. The utility model adopts a connection design between the oil inlet of a one-way valve and the pressure oil inlet, and two sets of energy storage mechanisms are connected in parallel at the oil outlet of the one-way valve and are redundant with each other, which effectively solves the technical problems of oil flow velocity fluctuation and insufficient flow supply in the pipeline caused by the response lag of the remote control oil pump, can effectively suppress the vibration of the control oil pipeline of the thermal turbine unit, and enhances the stability and safety of the operation of the thermal turbine unit.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The utility model discloses an accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit, comprising a pressure oil inlet, a pressure oil outlet connected to an oil motor, a one-way valve and two sets of energy storage mechanisms, wherein the pressure oil inlet is connected to the oil inlet of the one-way valve, the pressure oil outlet is connected to the oil outlet of the one-way valve, the two sets of energy storage mechanisms are connected in parallel to the oil outlet of the one-way valve and are redundant to each other; the energy storage mechanisms respectively comprise a pressure oil stop valve, a bladder accumulator and an air supply monitoring component which are connected in sequence, one end of the pressure oil stop valve is respectively connected to the oil chamber of the bladder accumulator, and the other end is respectively connected to the oil outlet of the one-way valve and the pressure oil outlet.

[0008] The gas supply monitoring assembly comprises a charging valve, a gas pressure instrument valve and a gas pressure gauge which are connected in sequence, and the charging valve is connected to the charging port of the bladder accumulator.

[0009] The energy storage mechanisms are respectively connected with hydraulic monitoring components, which include a hydraulic instrument valve and a liquid pressure gauge connected in sequence. One end of the hydraulic instrument valve is connected between the oil chamber of the bladder accumulator and the pressure oil stop valve, and the other end is connected to the liquid pressure gauge.

[0010] The utility model provides an accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit, and further comprises an oil return assembly, one end of which is respectively connected to the accumulator mechanism, and the other end is connected to the oil return port.

[0011] The oil return assembly comprises two oil return stop valves, one end of the two oil return stop valves is respectively connected between the pressure oil stop valves of the two sets of energy storage mechanisms and the oil chamber of the bladder accumulator, and the other end is connected to the oil return port.

[0012] The bladder accumulator is an AB type and / or a B type accumulator.

[0013] The advantages of adopting the utility model are:

[0014] 1. In the utility model, firstly, the energy storage mechanism is connected to the oil chamber and the pressure oil outlet of the bladder accumulator respectively through the pressure oil stop valve, and the cooperation of the air supply monitoring component makes up for the lack of response speed of the control oil pump arranged at the far end of the oil motor in the prior art. When the oil motor is activated and controls the regulating valve to open, the bladder accumulator connected nearby and in the energy storage state can respond in time to provide sufficient and stable pressure oil for the working chamber of the oil motor, effectively avoiding the fluctuation of the oil flow rate in the pipeline, and significantly suppressing the vibration of the control oil pipeline, thereby preventing oil leakage caused by loose pipe joints and even unit non-stop accidents.

[0015] Secondly, the design of two sets of redundant energy storage mechanisms not only improves the oil flow satisfaction, but also effectively avoids the need for shutdown maintenance caused by the failure of a single energy storage mechanism. This design not only ensures the continuous and stable operation of the device and the thermal turbine unit of the utility model, but also further enhances the convenience of online maintenance and replacement, and significantly improves the operation and maintenance efficiency.

[0016] In addition, the setting of the one-way valve ensures that the pressure oil in the thermal turbine control oil system flows into the oil chamber of the bladder accumulator in one direction, and at the same time accurately guides the pressure oil in the oil chamber of the bladder accumulator to the working chamber of the thermal turbine oil motor, providing a stable and sufficient oil supply for the oil motor, effectively avoiding the backflow of oil, ensuring the directionality of oil flow, and greatly enhancing the reliability and stability of the device.

[0017] In summary, the device of the utility model, through the connection design of the oil inlet of the one-way valve and the pressure oil inlet, the two sets of energy storage mechanisms are connected in parallel at the oil outlet of the one-way valve and are redundant with each other, and the connection structure of the air supply monitoring component, the bladder accumulator and the pressure oil stop valve and the pressure oil outlet in the energy storage mechanism, effectively solves the technical problems of oil flow velocity fluctuation and insufficient flow supply in the pipeline caused by the response lag of the remote control oil pump, can effectively suppress the vibration of the control oil pipeline of the thermal turbine unit, significantly improves the reliability, stability, and convenience of operation and maintenance of the device of the utility model, and enhances the stability and safety of the operation of the thermal turbine unit.

[0018] 2. In the utility model, the gas supply monitoring component realizes efficient, accurate and safe closed-loop control of the nitrogen filling pressure of the bladder accumulator through the online charging and discharging control function of the charging valve, combined with the real-time monitoring of the gas pressure gauge and the isolation function of the air pressure instrument valve, further improving the stability and reliability of the device.

[0019] 3. In the utility model, the hydraulic monitoring component adopts the structural design of hydraulic instrument valve and liquid pressure gauge, which significantly improves the convenience of oil pressure monitoring and the flexibility of maintenance. This design not only ensures the real-time monitoring of the oil pressure outside the bladder of the bladder accumulator, but also, when necessary, by closing the hydraulic instrument valve, the liquid pressure gauge can be easily inspected and disassembled, which greatly improves the maintainability of the device.

[0020] 4. In the utility model, the oil return assembly arranged on the energy storage mechanism is designed by connecting one end of the oil return stop valve between the pressure oil stop valve and the oil chamber of the bladder accumulator, and the other end is connected to the oil return port. When it is necessary to check the nitrogen charging pressure of the bladder accumulator, the operation and maintenance personnel only need to close the pressure oil stop valve corresponding to the bladder accumulator, and then open the oil return stop valve. After the pressure in the oil chamber drops to zero, the nitrogen charging pressure on the gas pressure gauge can be directly read, which greatly simplifies the workload during operation and maintenance and significantly improves work efficiency.

[0021] In addition, when the bladder accumulator and its internal bladder need to be replaced or overhauled, the oil pressure in the oil chamber of the bladder accumulator can be reduced to zero by closing the pressure oil shut-off valve and opening the return oil shut-off valve, thereby ensuring the safety of the operation and maintenance personnel when performing related operations.

[0022] 5. In the utility model, the bladder accumulator adopts AB type and / or B type accumulator, so that the bladder can be disassembled and inspected online without disassembling the accumulator as a whole, which not only improves the work efficiency but also enables easy online maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the principle diagram of the utility model.

[0024] The numbers in the figure are: 1. Pressure oil inlet, 2. Pressure oil outlet, 3. Return oil port, 4. Check valve, 5. Pressure oil stop valve, 6. Return oil stop valve, 7. Charging valve, 8. Liquid pressure gauge, 9. Gas pressure gauge, 10. Bladder accumulator, 11. Air pressure instrument valve, 12. Hydraulic instrument valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0026] The utility model is an accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit, such as Figure 1 As shown, it includes a pressure oil inlet 1, a pressure oil outlet 2 connected to the oil motor, a one-way valve 4 and two sets of energy storage mechanisms. The structure, position and connection relationship of each component are as follows:

[0027] The one-way valve 4 has an oil inlet and an oil outlet. The pressure oil inlet 1 is connected to the oil inlet of the one-way valve 4, and the pressure oil outlet 2 is connected to the oil outlet of the one-way valve 4. The two sets of energy storage mechanisms are connected in parallel to the oil outlet of the one-way valve 4 and are redundant to each other.

[0028] The energy storage mechanism includes a pressure oil stop valve 5, a bladder accumulator 10 and an air supply monitoring component which are connected in sequence. The bladder accumulator 10 includes an air chamber and an oil chamber. One end of the pressure oil stop valve 5 is connected to the oil chamber of the bladder accumulator 10, and the other end is connected to the oil outlet of the one-way valve 4 and the pressure oil outlet 2.

[0029] The energy storage mechanism adopts a mutually redundant design, which significantly enhances the reliability and stability of the device of the utility model. When one set of energy storage mechanism fails or requires maintenance, the other set can immediately take over to ensure the continuous and stable operation of the device and the thermal turbine unit, and effectively avoid the shutdown maintenance caused by the failure of a single energy storage mechanism. Furthermore, the two sets of energy storage mechanisms can work simultaneously or independently to meet different oil volume requirements. In addition, during operation, when one set of energy storage mechanism is in working condition, the other set can be replaced or repaired online at the same time to achieve non-stop maintenance, which greatly improves the convenience and efficiency of online operation and maintenance.

[0030] The air supply monitoring component is used to inflate and deflate the bladder in the bladder accumulator 10. At the same time, it can also monitor the inflation pressure in the bladder in real time to ensure that the bladder is in the best working condition.

[0031] In addition, the purpose of setting the one-way valve 4 is to allow only the pressure oil in the thermal turbine control oil system to flow into the oil chamber of the bladder accumulator 10, while also ensuring that the pressure oil in the oil chamber of the bladder accumulator 10 only flows into the working chamber of the thermal turbine oil motor connected thereto.

[0032] Continue to combine Figure 1 It is explained that the gas supply monitoring component includes a charging valve 7, an air pressure instrument valve 11 and a gas pressure gauge 9 which are connected in sequence. The charging valve 7 is connected to a compressed nitrogen source and is connected to the charging port of the bladder accumulator 10. The gas supply monitoring component can realize online charging and discharging operations of the bladder accumulator 10 by connecting the charging valve 7 to the charging port of the bladder accumulator 10, thereby accurately adjusting the nitrogen filling pressure in the bladder of the bladder accumulator 10. This design enables the nitrogen filling state of the bladder of the bladder accumulator 10 to be monitored and adjusted without interrupting operation, further improving the stability and reliability of the device. In addition, the structural design of the air pressure instrument valve 11 connected to the gas pressure gauge 9 facilitates the inspection and disassembly of the gas pressure gauge 9 after closing the air pressure instrument valve 11.

[0033] In summary, the gas supply monitoring component realizes efficient, accurate and safe closed-loop control of the nitrogen filling pressure of the bladder accumulator 10 through the online charging and discharging control function of the charging valve 7, combined with the real-time monitoring of the gas pressure gauge 9 and the isolation function of the air pressure instrument valve 11, further improving the stability and reliability of the device.

[0034] The energy storage mechanism is respectively connected with a hydraulic monitoring assembly, which includes a hydraulic instrument valve 12 and a liquid pressure gauge 8 connected in sequence, one end of the hydraulic instrument valve 12 is connected between the oil chamber of the bladder accumulator 10 and the pressure oil stop valve 5, and the other end is connected to the liquid pressure gauge 8. The liquid pressure gauge 8 is provided to monitor the oil pressure outside the bladder of the bladder accumulator 10, and the design of the hydraulic instrument valve 12 being connected to the liquid pressure gauge 8 is also convenient for the inspection and disassembly of the liquid pressure gauge 8 after the hydraulic instrument valve 12 is closed.

[0035] In order to more conveniently check the nitrogen filling pressure in the air chamber of the bladder accumulator 10 and maintain the bladder accumulator 10, the accumulator device for suppressing the vibration of the control oil pipeline of the thermal turbine unit proposed in the utility model also includes a return oil assembly for pressure relief, one end of the return oil assembly is connected to the energy storage mechanism, and the other end is connected to the return oil port 3.

[0036] Furthermore, if Figure 1 As shown, the oil return assembly includes two oil return stop valves 6, one end of the two oil return stop valves 6 is respectively connected between the pressure oil stop valves 5 of the two sets of energy storage mechanisms and the oil chamber of the bladder accumulator 10, and the other end is connected to the oil return port 3.

[0037] When it is necessary to check the nitrogen filling pressure of one of the bladder accumulators 10, it is only necessary to close the corresponding pressure oil stop valve 5, then open the return oil stop valve 6, and after confirming that the pressure value on the liquid pressure gauge 8 drops to zero, the nitrogen filling pressure of the bladder of the bladder accumulator 10 can be directly read through the gas pressure gauge 9. This operation method significantly reduces the workload of the operation and maintenance personnel and improves work efficiency.

[0038] When it is necessary to replace or overhaul the bladder accumulator 10 or the bladder therein, it is only necessary to completely close the pressure oil stop valve 5 connected thereto, and then open the return oil stop valve 6 connected thereto, and only after confirming that the pressure value of the liquid pressure gauge 8 drops to zero, the relevant replacement or overhaul operation is allowed.

[0039] In order to improve the maintenance efficiency and convenience of the device, preferably, the bladder accumulators 10 in the two sets of energy storage mechanisms adopt AB type and / or B type accumulators with structural advantages, which can ensure that the bladder in the bladder accumulator 10 can be disassembled and inspected online without disassembling the bladder accumulator 10.

[0040] In summary, when the device of the utility model is put into operation, first, it is necessary to ensure that the return oil stop valve 6 remains in a fully closed state and the pressure oil stop valve 5 remains in a fully open state. Next, the bladder of the bladder accumulator 10 is filled with compressed nitrogen through the charging valve 7, and the nitrogen pressure value filled into the bladder of the bladder accumulator 10 is monitored by the gas pressure gauge 9. Preferably, the nitrogen pressure filled into the bladder of the bladder accumulator 10 is 0.9 times the minimum working pressure of the thermal turbine control oil system. Subsequently, the pressure oil passes through the pressure oil port 1, the one-way valve 4 and the two pressure oil stop valves 5 in sequence, and finally enters the oil chamber of the bladder accumulator 10. At this time, the oil pressure value is monitored by the liquid pressure gauge 8 to ensure that the oil pressure outside the bladder of the bladder accumulator 10 is greater than the nitrogen filling pressure inside the bladder. The volume of the bladder will be compressed under the action of the oil pressure, so that the bladder enters the energy storage state.

[0041] The working principle of the oil motor is to drive the opening of the regulating valve by the pressure oil entering its working chamber. When the thermal turbine unit participates in the frequency modulation or peak regulation of the power grid, the oil motor needs to act quickly to adjust the power and frequency of the power grid. When the oil motor controls the regulating valve to open quickly, the bladder accumulator 10 in the utility model that is closely connected to the oil motor can respond in time, and the pressure oil stored in the oil chamber of the bladder accumulator 10 will quickly flow into the working chamber of the oil motor through the pressure oil outlet 2. At this time, the oil pressure outside the bladder will decrease rapidly, and the bladder in the energy storage state will immediately release its stored energy, do work on the oil, and transfer the accumulated energy to the oil. This process not only increases the oil pressure entering the working chamber of the oil motor, but also meets the high flow demand of the oil motor for the oil, thereby effectively suppressing the fluctuation of the regulating valve of the thermal turbine unit and the vibration of the control oil pipeline.

[0042] After the device of the utility model is introduced into the control oil system of the thermal turbine, the demand for the flow parameters of the control oil pump is significantly reduced. In addition, under normal operating conditions, the bladder accumulator 10 in the device of the utility model can also be connected to the control oil pump, and the control oil pump can continuously replenish the oil and store pressure for the bladder accumulator 10 at a lower flow rate.

[0043] The above description is only a specific implementation method of the present utility model. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all methods or steps in the process, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. An accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit, characterized in that: It comprises a pressure oil inlet (1), a pressure oil outlet (2) connected to an oil motor, a one-way valve (4) and two sets of energy storage mechanisms, wherein the pressure oil inlet (1) is connected to the oil inlet of the one-way valve (4), the pressure oil outlet (2) is connected to the oil outlet of the one-way valve (4), and the two sets of energy storage mechanisms are connected in parallel to the oil outlet of the one-way valve (4) and are mutually redundant; The energy storage mechanism comprises a pressure oil stop valve (5), a bladder accumulator (10) and an air supply monitoring component which are connected in sequence. One end of the pressure oil stop valve (5) is connected to the oil chamber of the bladder accumulator (10), and the other end is connected to the oil outlet of the one-way valve (4) and the pressure oil outlet (2).

2. The accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit according to claim 1, characterized in that: The gas supply monitoring assembly comprises a charging valve (7), a gas pressure instrument valve (11) and a gas pressure gauge (9) which are connected in sequence, and the charging valve (7) is connected to the charging port of the bladder accumulator (10).

3. The accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit according to claim 1, characterized in that: The energy storage mechanisms are respectively connected with hydraulic monitoring components, which include a hydraulic instrument valve (12) and a liquid pressure gauge (8) connected in sequence, one end of the hydraulic instrument valve (12) is connected between the oil chamber of the bladder accumulator (10) and the pressure oil stop valve (5), and the other end is connected to the liquid pressure gauge (8).

4. An accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit according to any one of claims 1 to 3, characterized in that: It also includes an oil return assembly, one end of which is connected to the energy storage mechanism, and the other end of which is connected to the oil return port (3).

5. The accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit according to claim 4, characterized in that: The oil return assembly comprises two oil return stop valves (6), one end of the two oil return stop valves (6) is respectively connected between the pressure oil stop valves (5) of the two sets of energy storage mechanisms and the oil chambers of the bladder accumulators (10), and the other end is connected to the oil return port (3).

6. An accumulator device for suppressing vibration of a control oil pipeline of a thermal turbine unit according to claim 5, characterized in that: The bladder type accumulator (10) is an AB type and / or a B type accumulator.

Images