A power station bypass control oil boosting system

Abstract

The present invention provides a power station bypass control oil boosting system, comprising a bypass main control oil circuit and an oil tank connected to the input end of the bypass main control oil circuit, and a bypass actuator arranged at the end of the boosting system, and also comprising: a boosting device, the output end of the boosting device is connected to the input end of an energy storage device, and the input end of the boosting device is connected to the output end of the main control oil circuit; an energy storage device, the output end of the energy storage device is connected to the bypass actuator; the present invention only adopts one boosting device and one energy storage device, and the two devices are connected to the main control oil circuit, so that the low-pressure control oil circuit generates a large high pressure on the energy storage device, which can realize the rapid response of the bypass system actuator, simplify the system and save costs, so that the low-pressure control oil circuit can be used normally, and can have the ability of rapid high-pressure response to the bypass actuator.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a power station bypass control oil boosting system. Background Art

[0002] The common thermal cycle of thermal power plants is the Rankine cycle, in which feed water is heated by a boiler, converted into qualified steam, and then enters the steam turbine to do work. The steam turbine drives the generator to generate electricity, and the exhaust steam after doing work enters the condenser, is cooled into condensate by the condenser, and the condensate is pressurized by a water pump and pumped into the boiler, repeating the cycle. When the steam turbine is started or stopped or fails, the steam cannot enter or cannot fully enter the steam turbine.

[0003] In order to save and recycle working fluids, increase the startup speed of the unit, and speed up the peak-shaving capacity of the unit, power plants generally install a turbine bypass system. The bypass system adopts one high-pressure bypass, two low-pressure bypass, and a high-pressure and low-pressure two-stage series bypass system. The high and low-pressure bypass systems are composed of electric isolation valves, hydraulic control valves, temperature and pressure reduction devices, heating pipe devices and other components.

[0004] When a unit is newly built or the bypass valve is modified, in order to reduce investment and simplify the bypass system, the bypass control oil is often taken from the main engine control oil system or the original control oil system for reuse. The design pressure of the main engine control oil system or the original control oil system is often lower than the control oil pressure required by the bypass or the bypass after modification, which makes it difficult to meet the requirements of fast opening or closing of the bypass. At present, the main method is to add multiple large-capacity accumulators, but this will cause the equipment to be larger in size and complicated in maintenance, and the charging time and volume of the accumulator itself will burden the EH hydraulic system.

[0005] The present invention makes full use of the low-pressure control oil system to meet the need for high-pressure control oil of the bypass system, thereby saving investment and simplifying the system. Summary of the invention

[0006] The present invention aims to provide a power plant bypass control oil pressurization system that overcomes the above problems or at least partially solves the above problems, so as to solve the problem of mismatch between the pressure design of the control oil system and the oil system required by the bypass.

[0007] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0008] The present invention provides a power station bypass control oil boosting system, comprising a bypass main control oil circuit, an oil tank connected to an input end of the bypass main control oil circuit, and a bypass actuator arranged at the end of the boosting system, and further comprising:

[0009] A booster device, wherein the output end of the booster device is connected to the input end of the energy storage device, and the input end of the booster device is connected to the output end of the main control oil circuit;

[0010] An energy storage device, the output end of which is connected to the bypass actuator.

[0011] As a further solution of the present invention, the boosting device includes a supercharger, the input end of the supercharger is respectively connected to the oil tank and the output end of the main control oil circuit, and the output end of the supercharger is connected to the energy storage device.

[0012] As a further solution of the present invention, the hydraulic oil at the input end of the booster controls the pressure of the hydraulic oil through a pressure reducing valve, a throttle valve is provided between the pressure reducing valve and the booster, the throttle valve is used to control the flow of the hydraulic oil, a first stop valve is provided between the pressure reducing valve and the main control oil circuit, an unloading circuit is provided at the output end of the booster to the inlet, and a one-way valve is provided on the circuit.

[0013] As a further solution of the present invention, the oil pipeline between the first stop valve and the pressure reducing valve is connected with a one-way air bleed device, the oil pipeline between the pressure reducing valve and the throttle valve is connected with a one-way air bleed device, and the oil circuit between the supercharger output end and the second stop valve is connected with a one-way air bleed device.

[0014] As a further solution of the present invention, after the hydraulic oil enters the supercharger, it flows to the oil pump and the turbine respectively. The hydraulic oil impulses the turbine and drives the oil pump to pressurize the imported hydraulic oil, and outputs the pressurized hydraulic oil to the oil pump outlet. The output end of the oil pump is connected to the accumulator, and pressure gauges are provided at the inlet and outlet positions of the oil pump. The return oil of the turbine enters the oil tank through the return oil pipe.

[0015] As a further solution of the present invention, the oil pump includes a pipeline booster pump, an electric booster pump and a hydraulic booster pump.

[0016] As a further solution of the present invention, the energy storage device includes an accumulator, and the oil port of the accumulator is respectively connected to a second shut-off valve oil circuit, a relief valve oil circuit and three oil circuits output to the main system oil circuit.

[0017] As a further solution of the present invention, the second stop valve oil circuit is connected to the output end of the booster device, the overflow valve oil circuit is connected to the oil tank, the output oil circuit is connected to the position where the bypass actuator disconnects the bypass system, and a pressure gauge is also provided on the output oil circuit.

[0018] As a further solution of the present invention, the output end of the overflow valve is divided into three oil circuits, one oil circuit is connected to the oil tank, another oil circuit is connected to the bypass actuator to close the bypass system position, and the last oil circuit is connected to the return oil pipe of the main equipment.

[0019] As a further solution of the present invention, the bypass actuator controls the opening or closing of the bypass system by controlling the displacement of the telescopic rod through hydraulic oil.

[0020] The present invention provides a power station bypass control oil boosting system, which has the following beneficial effects: the present invention only adopts one boosting device and one energy storage device, and the two devices are connected to the main control oil circuit, so that the low-pressure control oil circuit generates a relatively high pressure on the energy storage device, which can realize the rapid response of the bypass system actuator, simplify the system and save costs at the same time, so that the low-pressure control oil circuit can be used normally, and can have the ability of high-pressure rapid response to the bypass actuator, the boosting device continuously replenishes the hydraulic oil to the accumulator, so that the loss of oil pressure in the control oil circuit caused by oil leakage or other reasons can be compensated in time, so that the system runs smoothly, the combined use of the boosting device and the energy storage device avoids the problem that the auxiliary oil circuit requires a large amount of hydraulic oil, and can effectively control the consumption of hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the overall system oil circuit layout provided in an embodiment of the present invention.

[0023] Figure 2 The embodiment of the present invention provides Figure 1 The middle C position is the schematic diagram of the oil circuit layout of the supercharging device.

[0024] Figure 3 A schematic diagram of the main control oil circuit provided in an embodiment of the present invention.

[0025] Figure 4 The embodiment of the present invention provides Figure 1 The D position in the middle is the schematic diagram of the oil circuit of the energy storage device.

[0026] Figure 5 A schematic diagram of the connection between a boosting device and an energy storage device provided in an embodiment of the present invention.

[0027] Figure 6 A schematic diagram of a supercharger oil circuit provided in an embodiment of the present invention.

[0028] In the figure: 10, supercharger; 11, first stop valve; 12, pressure reducing valve; 13, throttle valve; 14, one-way valve; 20, accumulator; 21, second stop valve; 22, overflow valve; 30, one-way air release device; 40, oil pump; 50, turbine. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] See also Figure 1-Figure 6 As shown, a power station bypass control oil boosting system provided by an embodiment of the present invention can increase the working pressure of the accumulator when the pressure of the EH oil system is low and the volume of the accumulator is limited. The higher the working pressure of the accumulator, the more hydraulic oil capacity is accumulated, and the use efficiency of the accumulator is improved. The system includes a bypass main control oil circuit and an oil tank connected to the input end of the bypass main control oil circuit, and a bypass actuator arranged at the end of the boosting system, and also includes: a boosting device and an energy storage device, the output end of the boosting device is connected to the input end of the energy storage device, the input end of the boosting device is connected to the output end of the main control oil circuit, and the output end of the energy storage device is connected to the bypass actuator. The boosting device includes a supercharger 10, the input end of the supercharger 10 is respectively connected to the oil tank and the output end of the main control oil circuit, and the output end of the supercharger 10 is connected to the energy storage device. The hydraulic oil at the input end of the supercharger 10 controls the pressure of the hydraulic oil through the pressure reducing valve 12. A throttle valve 13 is provided between the pressure reducing valve 12 and the supercharger 10. The throttle valve 13 is used to control the flow of the hydraulic oil. A first stop valve 11 is provided between the pressure reducing valve 12 and the main control oil circuit. A check valve 14 is provided on the circuit of the supercharger 10. A one-way air release device 30 is connected to the oil pipe between the first stop valve 11 and the pressure reducing valve 12, a one-way air release device 30 is connected to the oil pipe between the pressure reducing valve 12 and the throttle valve 13, and a one-way air release device 30 is connected to the oil circuit between the supercharger 10 and the second stop valve 21. After the hydraulic oil enters the supercharger 10, it flows to the oil pump 40 and the turbine 50 respectively. The hydraulic oil impinges on the turbine 50 and drives the oil pump (40) to work. The hydraulic oil at the inlet of the oil pump is pressurized and then output to the oil pump 40. The output end of the oil pump 40 is connected to the accumulator 20. The oil inlet and outlet positions of the oil pump 40 are both provided with pressure gauges. The return oil of the turbine 50 enters the oil tank through the return oil pipe. The oil pump 40 includes a pipeline booster pump, an electric booster pump and a hydraulic booster pump.

[0031] The energy storage device includes an accumulator 20, and the oil port of the accumulator 20 is respectively connected to three oil circuits, namely, the second stop valve 21 oil circuit, the overflow valve 22 oil circuit, and the oil circuit output to the main system. The second stop valve 21 oil circuit is connected to the output end of the boosting device, the overflow valve 22 oil circuit is connected to the oil tank, the output oil circuit is connected to the position where the bypass actuator disconnects the bypass system, and a pressure gauge is also provided on the output oil circuit. The output end of the overflow valve 22 is divided into three oil circuits, one oil circuit is connected to the oil tank, another oil circuit is connected to the position where the bypass actuator closes the bypass system, and the last oil circuit is connected to the return oil pipe of the main system. The bypass actuator controls the opening or closing of the bypass system by controlling the displacement of the telescopic rod through hydraulic oil.

[0032] Principle of the present invention: Figure 1 , Figure 5 and Figure 6 As shown, the hydraulic oil is transmitted from point B to point A and enters the boosting device, and then is divided into two paths, one to the oil pump 40 and the other to the turbine 50. The inlet of the oil pump 40 is designed with a pressure gauge. The hydraulic oil performs work in the turbine 50. After the work is completed, the hydraulic oil enters the oil tank through the oil pipe. At the same time, the shaft of the turbine drives the shaft of the oil pump 40 to boost the hydraulic oil, and then outputs the high-pressure hydraulic oil, which enters the energy storage device through the pipeline. The outlet of the oil pump 40 is also designed with a pressure gauge for monitoring the pump outlet pressure. The hydraulic oil enters the actuator and actuates the valve through the controller. The hydraulic oil enters the energy storage device, charges the accumulator 20, and outputs it to the actuator of the bypass valve. The accumulator 20 is connected to the two flow ports of the actuator through two oil circuits, and the cooperation of the two flow ports completes the switching action of the actuator; the accumulator 20 returns to the oil tank when it is over-pressured or discharged, and when the bypass valve is quickly opened or closed, the pressure oil stored in the accumulator 20 quickly provides the hydraulic execution force of the action; the booster 10 provides the function of charging the accumulator after the bypass is quickly opened or closed, and supplementing the system leakage during normal operation.

[0033] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A power station bypass control oil boosting system, comprising a bypass main control oil circuit, an oil tank connected to the input end of the bypass main control oil circuit, and a bypass actuator arranged at the end of the boosting system, characterized in that: Also includes: A booster device, wherein the output end of the booster device is connected to the input end of the energy storage device, and the input end of the booster device is connected to the output end of the main control oil circuit; An energy storage device, wherein an output end of the energy storage device is connected to a bypass actuator; The boosting device comprises a booster (10), the input end of the booster (10) is respectively connected to the oil tank and the output end of the main control oil circuit, and the output end of the booster (10) is connected to the energy storage device; The hydraulic oil at the input end of the booster (10) controls the pressure of the hydraulic oil through a pressure reducing valve (12); a throttle valve (13) is provided between the pressure reducing valve (12) and the booster (10); the throttle valve (13) is used to control the flow of the hydraulic oil; a first stop valve (11) is provided between the pressure reducing valve (12) and the main control oil circuit; the output end of the booster (10) has a pressure relief circuit to the inlet; a controllable one-way valve (14) is provided on the circuit of the booster (10); The oil pipe between the first stop valve (11) and the pressure reducing valve (12) is connected to a one-way air venting device (30), the oil pipe between the pressure reducing valve (12) and the throttle valve (13) is connected to a one-way air venting device (30), and the oil circuit between the output of the supercharger (10) and the second stop valve (21) is connected to a one-way air venting device (30); After the hydraulic oil enters the supercharger (10), it flows to the oil pump (40) and the turbine (50) respectively. The hydraulic oil impinges on the turbine (50) and drives the oil pump (40). The hydraulic oil entering the oil pump is pressurized and then output to the outlet of the oil pump (40). The output end of the oil pump (40) is connected to the accumulator (20). Pressure gauges are provided at the oil inlet and outlet positions of the oil pump (40). The return oil of the turbine (50) enters the oil tank through the oil return pipe. The oil pump (40) comprises a pipeline booster pump, an electric booster pump and a hydraulic booster pump; The energy storage device comprises an accumulator (20), the oil port of the accumulator (20) being respectively connected to an oil circuit of a second stop valve (21), an oil circuit of a relief valve (22), and an oil circuit output from the accumulator to a main system; The oil circuit of the second stop valve (21) is connected to the output end of the booster device, the oil circuit of the overflow valve (22) is connected to the oil tank, the output oil circuit of the accumulator is connected to the position where the bypass actuator disconnects the bypass system, and a pressure gauge is also provided on the output oil circuit of the accumulator; The output end of the overflow valve (22) is divided into three oil circuits, the first oil circuit is connected to the oil tank, the second oil circuit is connected to the bypass actuator to close the bypass system position, and the third oil circuit is connected to the return oil pipe of the main system.

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