CN115182791A - Steam turbine regulating valve quick closing and servomotor buffer system - Google Patents

Steam turbine regulating valve quick closing and servomotor buffer system Download PDF

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Publication number
CN115182791A
CN115182791A CN202210685104.5A CN202210685104A CN115182791A CN 115182791 A CN115182791 A CN 115182791A CN 202210685104 A CN202210685104 A CN 202210685104A CN 115182791 A CN115182791 A CN 115182791A
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China
Prior art keywords
valve
pressure
pressure relief
closing
steam turbine
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CN202210685104.5A
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Chinese (zh)
Inventor
梅益铭
楼玉民
朱宝
祝相云
李佳敏
罗永强
倪颖峰
冯大元
康开
杨志明
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Zhejiang Energy Group Research Institute Co Ltd
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Zhejiang Energy Group Research Institute Co Ltd
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Priority to CN202210685104.5A priority Critical patent/CN115182791A/en
Publication of CN115182791A publication Critical patent/CN115182791A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Abstract

The invention relates to a steam turbine regulating valve speed closing and servomotor buffer system, comprising: the regulating valve control unit is connected with the regulating valve motion unit; the regulating valve movement unit consists of a valve seat, a valve body, a valve rod, a connecting rod, a valve shell, a servomotor piston, a spring A, a piston rod and an end cover; the valve seat contacts with the valve body to form a sealing valve; the valve body is connected with a valve rod, and the valve rod is connected with a connecting rod; the connecting rod is connected with the piston of the oil-driven machine through the piston rod. The beneficial effects of the invention are: the invention controls the closing speed of the regulating valve of the steam turbine in different states by judging the closing condition of the regulating valve and the load level of the steam turbine, can ensure that the impact force of a valve and a hydraulic component in an oil-driven engine oil cylinder when the regulating valve of the steam turbine is quickly closed can be reduced under the condition of no overspeed when the working conditions of the steam turbine, such as load shedding, accident shutdown and the like, and prolongs the service life of the regulating valve and the hydraulic component thereof.

Description

Steam turbine regulating valve quick closing and servomotor buffer system
Technical Field
The invention belongs to the technical field of power station turbines, and particularly relates to a turbine regulating valve speed closing and servomotor buffer system.
Background
Under the large environment of global energy innovation, china is actively promoting clean innovation of energy structures. In recent years, the installed capacity of new energy represented by photovoltaic and wind power is rapidly increased, but the random and intermittent unstable characteristics of the new energy determine that domestic power generation at present keeps a structure mainly comprising a thermal generator set. In order to improve the power generation efficiency of the thermal generator set and control the emission of the thermal generator set, the thermal generator set is also developed towards higher parameters and higher installed capacity.
At present, domestic on-service or newly-built thermal generator sets mainly comprise supercritical or ultra-supercritical generator sets, and the generator sets have the characteristics of high steam parameters and high steam flow. In order to prevent the rotor from overspeed when the unit is shut down or load shedding occurs in an accident, the 'turbine regulating control system test guide rule' puts higher requirements on the closing time of the valve of the large-scale turbine unit; in the actual unit design process, the closing speed of the main steam valve and the regulating valve of the steam turbine is increased by increasing the pre-tightening force of the spring or changing the pre-tightening force into a butterfly spring. However, the instantaneous impact force borne by the main valve and the valve seat is too large due to the too high closing speed of the steam turbine regulating valve, and particularly, the valve body and the valve seat can be damaged under the condition that the matching between the stroke of the piston of the servomotor and the stroke of the valve rod is poor; and the damage may cause the surface layer metal of the valve seat and the valve body to fall off, which brings great risk to the operation of the unit.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a steam turbine regulating valve speed switch and a servomotor buffer system.
The turbine regulating valve quick-closing and servomotor buffering system comprises a regulating valve movement unit, a regulating valve control unit and a regulating valve quick-closing unit;
the regulating valve movement unit consists of a valve seat, a valve body, a valve rod, a connecting rod, a valve shell, a servomotor piston, a spring A, a piston rod and an end cover; the valve seat contacts with the valve body to form a sealing valve; the valve body is connected with a valve rod, and the valve rod is connected with a connecting rod; the connecting rod is connected with the piston of the hydraulic engine through a piston rod; the servomotor piston is plugged into the end cover to form a closed chamber; the piston rod is sleeved with a spring A;
the regulating valve control unit consists of an oil tank, an oil inlet pipeline, an overflow valve C, a servo valve, an oil return pipeline, a cartridge valve, a spring B, a safety oil pipeline, an electromagnetic valve and a one-way valve; the oil tank is connected with an overflow valve C through an oil inlet pipeline; one path of outlet of the overflow valve C is connected with the servo valve, and the other path of outlet is connected with the safety oil pipeline; one path of the overflow valve C connected with the servo valve is connected with an inlet at the lower part of the piston of the hydraulic motor; an outlet at the lower part of the piston of the hydraulic engine is connected with an oil return pipeline; one path of the safety oil pipeline is connected with the electromagnetic valve, a one-way valve is connected in parallel on the pipeline where the electromagnetic valve is located, and the other path of the safety oil pipeline is connected with the cartridge valve; the bottom of the cartridge valve is provided with a spring B;
the regulating valve quick-closing unit consists of a power sensor, a pressure sensor, a quick-closing clamping piece, a pressure relief electromagnetic valve A, a pressure relief electromagnetic valve B, an overflow valve A, an overflow valve B and a stop valve; the pressure relief electromagnetic valve A and the overflow valve A are connected in series and then are installed on an oil return pipeline, and the pressure relief electromagnetic valve A is connected with a closed cavity at the lower part of a piston of the servomotor; the pressure relief electromagnetic valve B and the overflow valve B are connected in series and then are installed on the oil return pipeline; the pressure relief electromagnetic valve B is connected with a closed cavity at the lower part of the servomotor piston; a pressure gauge is arranged on a pipeline between the pressure relief electromagnetic valve A and the pressure relief electromagnetic valve B; stop valves are arranged at the outlets of the overflow valve A and the overflow valve B; the power sensor and the pressure sensor are electrically connected with an input port of the quick-closing card.
Preferably, the front end of the servomotor piston is a circular truncated cone shaped plunger, and the plunger is plugged into a circular hole on the end cover to form a closed chamber.
Preferably, a slide valve is arranged inside the servo valve; the electromagnetic valve is a normally open type.
Preferably, the branch where the pressure relief solenoid valve a and the relief valve a are connected in series is connected in parallel with the branch where the pressure relief solenoid valve B and the relief valve B are connected in series.
Preferably, the connection relationship between the steam turbine and other control elements is as follows: the steam turbine is divided into three paths, wherein the first path is electrically connected with the distributed control system, the second path is electrically connected with the power sensor, and the third path is electrically connected with the pressure sensor; the power sensor and the pressure sensor are connected in parallel; the distributed control system is electrically connected with the digital electro-hydraulic control system, the trip protection system, the power sensor, the pressure sensor and the quick closing card; the digital electro-hydraulic control system is electrically connected with the OPC electromagnetic valve; the trip protection system is electrically connected with the AST electromagnetic valve; the OPC electromagnetic valve and the AST electromagnetic valve are both electrically connected with the servomotor, the servomotor is electrically connected with the regulating valve, and the servomotor is also electrically connected with the buffer cavity; the quick closing member is electrically connected with the pressure relief electromagnetic valve A and the pressure relief electromagnetic valve B; the buffer cavity is electrically connected with the overflow valve A and the overflow valve B; the pressure relief solenoid valve A is connected with the overflow valve A in series, and the pressure relief solenoid valve B is connected with the overflow valve B in series.
Preferably, the quick-closing card is an acquisition controller.
The working method of the turbine regulating valve speed closing and servomotor buffer system comprises the following steps:
step 1, the distributed control system sends a closing instruction to a digital electro-hydraulic control system or a trip protection system, and simultaneously sends the closing instruction to a quick closing card piece;
step 2, when the digital electro-hydraulic control system receives the instruction, the OPC electromagnetic valve acts to influence the safety oil pressure; when the tripping protection system receives the instruction, the AST electromagnetic valve acts, the safety oil pressure is reduced, the cartridge valve is opened, an oil return pipeline at the lower part of the piston of the servomotor is conducted, and the piston of the servomotor is closed and drives the regulating valve to be closed;
step 3, presetting regulation pressure and generator power, and acquiring signals of a pressure sensor and a power sensor through an input port of a quick closing card; when the speed pass piece receives the instruction, according to the closing instruction received by the speed pass piece, and in combination with the unit parameter result measured by the pressure sensor and the power sensor, judging whether the steam turbine is in an accident shutdown state, a load shedding state or a normal shutdown state; when the received signal is a normal stop signal, the quick closing card does not output an instruction; and when the received signal is an abnormal shutdown signal, judging whether the steam turbine is in a high load state or a low load state by comparing real-time values and set values of the power signal and the pressure signal, and reacting.
Preferably, step 3 specifically comprises the following steps:
step 3.1, if a manual stop instruction and generator disconnection are received and the power of a steam turbine is less than 15% of rated power, judging that the machine set is normally stopped, otherwise, judging that the machine set is abnormally stopped; when the unit is normally stopped, closing the pressure relief electromagnetic valve A and the pressure relief electromagnetic valve B, and if the judgment result is abnormal stop, executing the step 3.2;
step 3.2, when the unit is abnormally stopped, continuously judging whether the steam turbine is in an accident stop state or a load shedding state, and reacting;
step 3.2.1, if the steam turbine is in a load shedding state, comparing the measured values of the pressure sensor and the power sensor with preset values; if the power of the steam turbine is greater than 50% of rated power and the pressure of the regulating level measured by the pressure sensor is greater than 60% of rated pressure, the pressure relief solenoid valve A is opened, otherwise, the pressure relief solenoid valve B is opened; when the OPC electromagnetic valve is reset, the pressure relief electromagnetic valve A and the pressure relief electromagnetic valve B are reset;
step 3.2.2, if the steam turbine is in an accident shutdown state, comparing the measured values of the pressure sensor and the power sensor with preset values; if the power of the steam turbine is greater than 50% of rated power and the pressure of the regulating stage is greater than 60% of rated pressure, the pressure relief solenoid valve A is opened, otherwise, the pressure relief solenoid valve B is opened, and the pressure relief solenoid valve A and the pressure relief solenoid valve B are not reset;
step 3.3, judging the position of the steam turbineWhether in the high load state or in the low load state, and reacts: the relief pressure of the relief valve A is set to P 1 Setting the relief pressure of relief valve B to P 2 (ii) a When the steam turbine is in the accident trip or load shedding situation under the high load state, the pressure relief electromagnetic valve A is opened, and the overflow pressure P of the overflow valve A 1 Setting according to the set closing time of the regulating valve of the steam turbine; when the steam turbine is in accident trip or load shedding situation under the low-load state, the pressure relief electromagnetic valve B is opened, and the overflow pressure P of the overflow valve B 2 Reference P 1 The set value of the device is adjusted upwards to a certain extent.
The beneficial effects of the invention are: the invention controls the closing speed of the regulating valve of the steam turbine in different states by judging the closing condition of the regulating valve and the load level of the steam turbine, can ensure that the impact force of a valve and a hydraulic component in an oil-driven engine oil cylinder when the regulating valve of the steam turbine is quickly closed can be reduced under the condition of no overspeed when the working conditions of the steam turbine, such as load shedding, accident shutdown and the like, and prolongs the service life of the regulating valve and the hydraulic component thereof.
Drawings
FIG. 1 is a diagram of the connection of a turbine governor valve and a servomotor buffer system;
FIG. 2 is a schematic diagram of a turbine governor valve speed shut and a servomotor buffer system;
FIG. 3 is a flow chart of operation of the turbine governor valve speed shutdown and the servomotor buffer system.
Description of the reference numerals:
the hydraulic control system comprises a valve seat 001, a valve body 002, a valve rod 003, a connecting rod 004, a valve shell 005, a servomotor piston 006, a spring A007, a piston rod 008, an end cover 009, an oil inlet pipeline 010, an oil return pipeline 011, a safety oil pipeline 012, a cartridge valve 013, a spring B014, a pressure relief solenoid valve A015, a pressure gauge 016, a pressure relief solenoid valve B017, an overflow valve A018, an overflow valve B019, a stop valve 020, a solenoid valve 021, a one-way valve 022, a servo valve 023, an oil tank 024, an overflow valve C025, a distributed control system 101, a digital electro-hydraulic control system 102, a trip protection system 103, an OPC solenoid valve 104, an AST solenoid valve 105, a pressure sensor 106 and a power sensor 107.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to provide an understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
Example one
The first embodiment of the present application provides a steam turbine regulating valve speed closing and servomotor buffering system as shown in fig. 1 and fig. 2, which includes a regulating valve movement unit, a regulating valve control unit, and a regulating valve speed closing unit;
the regulating valve movement unit consists of a valve seat 001, a valve body 002, a valve rod 003, a connecting rod 004, a valve shell 005, a servomotor piston 006, a spring A007, a piston rod 008 and an end cover 009; the valve seat 001 is contacted with the valve body 002 to form a sealing valve; the valve body 002 is connected with a valve rod 003, and the valve rod 003 is connected with a connecting rod 004; the connecting rod 004 is connected with the servomotor piston 006 through the piston rod 008; the servomotor piston 006 is plugged into the end cover 009 to form a closed chamber; a spring A007 is sleeved on the piston rod 008; the front end of the servomotor piston 006 is a circular truncated cone-shaped plunger, and the plunger is plugged into a circular hole on the end cover 009 to form a closed chamber;
the control unit of the regulating valve consists of an oil tank 024, an oil inlet pipeline 010, an overflow valve C025, a servo valve 023, an oil return pipeline 011, a cartridge valve 013, a spring B014, a safety oil pipeline 012, an electromagnetic valve 021 and a one-way valve 022; the oil tank 024 is connected with an overflow valve C025 through an oil inlet pipeline 010; one path of outlet of the overflow valve C025 is connected with the servo valve 023, and the other path of outlet is connected with the safety oil pipeline 012; one path of the overflow valve C025 connected with the servo valve 023 is connected with an inlet at the lower part of the servomotor piston 006; an outlet at the lower part of the servomotor piston 006 is connected with an oil return pipeline 011; one path of the safety oil pipeline 012 is connected with an electromagnetic valve 021, a one-way valve 022 is connected in parallel to a pipeline where the electromagnetic valve 021 is located, and the other path of the safety oil pipeline 012 is connected with a cartridge valve 013; a spring B014 is arranged at the bottom of the cartridge valve 013; a spool is provided inside the servo valve 023; the electromagnetic valve 021 is normally open;
the regulating valve quick closing unit consists of a power sensor 107, a pressure sensor 106, a quick closing clamping piece, a pressure relief solenoid valve A015, a pressure relief solenoid valve B017, an overflow valve A018, an overflow valve B019 and a stop valve 020; the pressure relief electromagnetic valve A015 and the overflow valve A018 are connected in series and then are installed on the oil return pipeline 011, and the pressure relief electromagnetic valve A015 is connected with a closed cavity at the lower part of the servomotor piston 006; the pressure relief solenoid valve B017 and the overflow valve B019 are connected in series and then are installed on the oil return pipeline 011; the pressure relief solenoid valve B017 is connected to a closed chamber at the lower portion of the servomotor piston 006; a pressure gauge 016 is arranged on a pipeline between the pressure relief solenoid valve A015 and the pressure relief solenoid valve B017 and is used for detecting whether the pipeline where the quick closing unit is located leaks or not in normal operation; stop valves 020 are arranged at the outlets of the overflow valve A018 and the overflow valve B019, so that system isolation during quick closing unit maintenance is guaranteed; the power sensor 107 and the pressure sensor 106 are electrically connected with an input port of the quick-closing card; a branch in which the pressure relief solenoid valve A015 and the overflow valve A018 are connected in series is connected in parallel with a branch in which the pressure relief solenoid valve B017 and the overflow valve B019 are connected in series; the quick closing clamping piece is an acquisition controller with high-speed acquisition, storage and high-speed operation functions;
the steam turbine is divided into three paths, wherein the first path is electrically connected with the distributed control system 101, the second path is electrically connected with the power sensor 107, and the third path is electrically connected with the pressure sensor 106; the power sensor 107 and the pressure sensor 106 are connected in parallel; the distributed control system 101 is electrically connected with the digital electro-hydraulic control system 102, the trip protection system 103, the power sensor 107, the pressure sensor 106 and the speed trip device; the digital electro-hydraulic control system 102 is electrically connected with an OPC electromagnetic valve 104; the trip protection system 103 is electrically connected to the AST solenoid valve 105; the OPC electromagnetic valve 104 and the AST electromagnetic valve 105 are both electrically connected with a servomotor which is electrically connected with a regulating valve and a buffer cavity; the quick-closing member is electrically connected with the pressure relief solenoid valve A015 and the pressure relief solenoid valve B017; the buffer cavity is electrically connected with an overflow valve A018 and an overflow valve B019; pressure relief solenoid valve A015 is connected in series with overflow valve A018, and pressure relief solenoid valve B017 is connected in series with overflow valve B019.
Example two
On the basis of the first embodiment, the second embodiment of the present application provides an embodiment of a method for operating a steam turbine governor valve speed closing and servomotor buffer system as shown in fig. 3:
step 1, closing a turbine regulating valve is realized through the common cooperation of the DCS, the DEH, the ETS and a regulating valve speed closing unit, a distributed control system 101 sends a closing instruction to a digital electro-hydraulic control system 102 or a trip protection system 103, and meanwhile, sends the closing instruction to a speed closing card piece;
step 2, when the digital electro-hydraulic control system 102 receives an instruction, the OPC electromagnetic valve 104 acts to influence the safety oil pressure; when the tripping protection system 103 receives the instruction, the AST solenoid valve 105 operates, the safety oil pressure drops, the cartridge valve 013 is opened, the oil return pipeline 011 at the lower part of the oil engine piston 006 is conducted, and the oil engine piston 006 is closed and drives the regulating valve to be closed; the power oil in the oil tank 024 enters the overflow valve C025 through the oil inlet pipeline 010; the power oil in one path of the overflow valve C025 connected with the servo valve 023 enters the hydraulic motor through an inlet at the lower part of the hydraulic motor piston 006 and enters the oil return pipeline 011 through an outlet at the upper part of the hydraulic motor piston 006 under the control of the servo valve 023; servo valve 023 adjusts the position of the internal slide valve according to the received electrical signal to either feed or return oil; the oil inlet and return of the closed chamber are controlled by the movement of the servomotor piston 006: after the circular truncated cone-shaped plunger on the servomotor piston 006 enters the circular hole on the end cover 009, the flow area of the circular hole is reduced, the oil return rate of the power oil is reduced, the power oil pressure at the lower part of the servomotor piston 006 is increased, and the motion of the servomotor piston 006 drives the piston rod 008 to move up and down, so as to drive the connecting rod 004 to move; the movement of the connecting rod 004 drives the valve rod 003 to move up and down; the closing speed of the piston rod 008 decreases; when the plunger completely enters the circular hole, the plunger is matched with the circular hole, and a closed chamber filled with power oil is formed at the lower end of the piston 006 of the servomotor; the pressure of the power oil at the lower part of the servomotor piston 006 further rises, and the closing speed of the piston rod 008 further falls until the movement of the servomotor piston 006 completely stops;
step 3, presetting regulation pressure and generator power, and acquiring signals of a pressure sensor 106 and a power sensor 107 through an input port of a quick closing clamping piece; when the speed pass element receives the instruction, according to the closing instruction received by the speed pass element, and in combination with the unit parameter results measured by the pressure sensor 106 and the power sensor 107, judging whether the steam turbine is in an accident shutdown state, a load shedding state or a normal shutdown state; when a normal stop signal is received, the quick closing card does not output an instruction; when the received signal is an abnormal shutdown signal, judging whether the steam turbine is in a high load state or a low load state by comparing real-time values and set values of the power signal and the pressure signal, and reacting;
step 3.1, if a manual stop instruction and generator disconnection are received and the power of the steam turbine is less than 15% of rated power, judging that the machine set is normally stopped, otherwise, judging that the machine set is abnormally stopped; when the unit is normally stopped, the pressure relief solenoid valve A015 and the pressure relief solenoid valve B017 are both closed, so that the buffering effect of the servomotor is increased, and the impact and the abrasion during normal stop are reduced; when the unit normally operates, the oil return side of the safety oil pipeline 012 is cut off to ensure the pressure of the safety oil pipeline, the cartridge valve 013 is in a closed state under the combined force of the pre-tightening force of the spring, the pressure of the power oil and the pressure of the safety oil, and the oil return pipeline 011 at the lower part of the oil engine piston 006 is cut off; when the return oil of the safety oil pipeline 012 is conducted, the pressure of the safety oil drops, the cartridge valve 013 is opened under the pressure of the power oil, and the oil return pipeline 011 at the lower part of the servomotor piston 006 is conducted; if the judgment result is abnormal shutdown, executing the step 3.2;
step 3.2, when the unit is abnormally stopped, continuously judging whether the steam turbine is in an accident stop state or a load shedding state, and reacting;
step 3.2.1, if the steam turbine is in a load shedding state, comparing the measured values of the pressure sensor 106 and the power sensor 107 with preset values; if the power of the steam turbine is larger than 50% of rated power and the pressure of the regulating stage measured by the pressure sensor is larger than 60% of rated pressure, the pressure relief solenoid valve A015 is started, otherwise, the pressure relief solenoid valve B017 is started; when the OPC electromagnetic valve is reset, the pressure relief electromagnetic valve A015 and the pressure relief electromagnetic valve B017 are reset, so that the oil return of an oil cavity at the lower part of the piston of the oil engine is blocked;
step 3.2.2, if the steam turbine is in the accident shutdown state, comparing the measured values of the pressure sensor 106 and the power sensor 107 with preset values; if the power of the steam turbine is larger than 50% of rated power and the pressure of the regulating stage is larger than 60% of rated pressure, the pressure relief solenoid valve A015 is opened, otherwise, the pressure relief solenoid valve B017 is opened, and the pressure relief solenoid valve A015 and the pressure relief solenoid valve B017 do not return;
step 3.3, judging whether the steam turbine is in a high load state or a low load state, and reacting: the relief pressure of the relief valve A018 was set to P 1 Setting the overflow pressure of the overflow valve B019 to P 2 (ii) a When the turbine is in the accident trip or load shedding situation under the high load state, the pressure relief electromagnetic valve A015 is opened, and the relief pressure P of the relief valve A018 is 1 The method is set according to the set closing time of the regulating valve of the steam turbine, so that the regulating valve is ensured to be closed quickly, and the rotating speed of the steam turbine is inhibited from flying up; when the steam turbine is in the accident trip or load shedding situation under the low-load state, the pressure relief electromagnetic valve B017 is opened, and the overflow pressure P of the overflow valve B019 2 Reference P 1 Is adjusted up to a certain degree (is P) 1 1.5 times) of the pressure difference, and the speed of the regulating valve is closed and the servomotor is buffered.
For a unit, the rotor flying rates of different steam parameters and flow rates are different, and under the condition of low load, the closing rate of a unit regulating valve at the tail end can be properly reduced to reduce the damage caused by impact.

Claims (8)

1. The utility model provides a steam turbine governing valve fast closes and servomotor buffer system which characterized in that: the device comprises a regulating valve movement unit, a regulating valve control unit and a regulating valve quick-closing unit;
the regulating valve movement unit consists of a valve seat (001), a valve body (002), a valve rod (003), a connecting rod (004), a valve shell (005), an oil engine piston (006), a spring A (007), a piston rod (008) and an end cover (009); the valve seat (001) is contacted with the valve body (002) to form a sealing valve; the valve body (002) is connected with a valve rod (003), and the valve rod (003) is connected with a connecting rod (004); the connecting rod (004) is connected with the oil engine piston (006) through a piston rod (008); the servomotor piston (006) is plugged into the end cover (009) to form a closed cavity; a spring A (007) is sleeved on the piston rod (008);
the control unit of the regulating valve consists of an oil tank (024), an oil inlet pipeline (010), an overflow valve C (025), a servo valve (023), an oil return pipeline (011), a cartridge valve (013), a spring B (014), a safety oil pipeline (012), an electromagnetic valve (021) and a one-way valve (022); the oil tank (024) is connected with an overflow valve C (025) through an oil inlet pipeline (010); one path of outlet of the overflow valve C (025) is connected with the servo valve (023), and the other path of outlet is connected with the safety oil pipeline (012); one path of the overflow valve C (025) connected with the servo valve (023) is connected with an inlet at the lower part of the hydraulic engine piston (006); an outlet at the lower part of the oil engine piston (006) is connected with an oil return pipeline (011); one path of the safety oil pipeline (012) is connected with an electromagnetic valve (021), the pipeline where the electromagnetic valve (021) is located is connected with a one-way valve (022) in parallel, and the other path of the safety oil pipeline (012) is connected with a cartridge valve (013); the bottom of the cartridge valve (013) is provided with a spring B (014);
the regulating valve quick-closing unit consists of a power sensor (107), a pressure sensor (106), a quick-closing clamping piece, a pressure relief solenoid valve A (015), a pressure relief solenoid valve B (017), an overflow valve A (018), an overflow valve B (019) and a stop valve (020); the pressure relief electromagnetic valve A (015) and the overflow valve A (018) are connected in series and then are installed on the oil return pipeline (011), and the pressure relief electromagnetic valve A (015) is connected with a closed cavity at the lower part of the piston (006) of the oil engine; the pressure relief solenoid valve B (017) and the overflow valve B (019) are connected in series and then are installed on the oil return pipeline (011); the pressure relief electromagnetic valve B (017) is connected with a closed chamber at the lower part of the servomotor piston (006); a pressure gauge (016) is arranged on a pipeline between the pressure relief solenoid valve A (015) and the pressure relief solenoid valve B (017); stop valves (020) are arranged at the outlets of the overflow valve A (018) and the overflow valve B (019); the power sensor (107) and the pressure sensor (106) are electrically connected with an input port of the quick-closing card.
2. The turbine governor valve closing and servomotor snubber system of claim 1, wherein: the front end of the servomotor piston (006) is a circular truncated cone-shaped plunger, and the plunger is plugged into a circular hole in the end cover (009) to form a closed cavity.
3. The turbine governor valve closing and servomotor snubber system of claim 1, wherein: a spool is arranged inside the servo valve (023); the electromagnetic valve (021) is of a normally open type.
4. The turbine governor valve closing and servomotor snubber system of claim 1, wherein: the branch where the pressure relief solenoid valve A (015) and the overflow valve A (018) are connected in series is connected in parallel with the branch where the pressure relief solenoid valve B (017) and the overflow valve B (019) are connected in series.
5. The turbine governor valve closing and servomotor snubber system of claim 1, wherein: the turbine is divided into three paths, wherein the first path is electrically connected with the distributed control system (101), the second path is electrically connected with the power sensor (107), and the third path is electrically connected with the pressure sensor (106); the power sensor (107) and the pressure sensor (106) are connected in parallel; the distributed control system (101) is electrically connected with the digital electro-hydraulic control system (102), the trip protection system (103), the power sensor (107), the pressure sensor (106) and the quick closing piece; the digital electro-hydraulic control system (102) is electrically connected with an OPC electromagnetic valve (104); the trip protection system (103) is electrically connected with the AST solenoid valve (105); the OPC electromagnetic valve (104) and the AST electromagnetic valve (105) are electrically connected with the servomotor, the servomotor is electrically connected with the regulating valve, and the servomotor is also electrically connected with the buffer cavity; the quick-closing member is electrically connected with the pressure relief solenoid valve A (015) and the pressure relief solenoid valve B (017); the buffer cavity is electrically connected with an overflow valve A (018) and an overflow valve B (019); pressure relief solenoid valve A (015) is established ties overflow valve A (018), and pressure relief solenoid valve B (017) is established ties overflow valve B (019).
6. The turbine governor valve closing and servomotor snubber system of claim 1, wherein: the quick closing clamping piece is an acquisition controller.
7. A method of operating the turbine governor valve speed shut and servomotor snubber system of claim 1, comprising the steps of:
step 1, a distributed control system (101) sends a closing instruction to a digital electro-hydraulic control system (102) or a trip protection system (103), and simultaneously sends the closing instruction to a quick closing piece;
step 2, when the digital electro-hydraulic control system (102) receives the instruction, the OPC electromagnetic valve (104) acts to influence the safety oil pressure; when the tripping protection system (103) receives an instruction, the AST electromagnetic valve (105) acts, the safety oil pressure is reduced, the cartridge valve (013) is opened, the oil return pipeline (011) at the lower part of the oil engine piston (006) is conducted, and the oil engine piston (006) is closed and drives the regulating valve to be closed;
step 3, presetting regulation pressure and generator power, and acquiring signals of a pressure sensor (106) and a power sensor (107) through an input port of a quick closing clamping piece; when the speed pass element receives the instruction, according to the closing instruction received by the speed pass element, and in combination with the unit parameter result measured by the pressure sensor (106) and the power sensor (107), judging whether the steam turbine is in an accident shutdown state, a load shedding state or a normal shutdown state; when the received signal is a normal stop signal, the quick closing card does not output an instruction; and when the received abnormal stop signal is abnormal, judging whether the steam turbine is in a high load state or a low load state by comparing real-time values and set values of the power signal and the pressure signal, and reacting.
8. The method of operating a turbine governor valve and servomotor snubber system as recited in claim 7, wherein step 3 comprises the steps of:
step 3.1, if a manual stop instruction and generator disconnection are received and the power of the steam turbine is less than 15% of rated power, judging that the machine set is normally stopped, otherwise, judging that the machine set is abnormally stopped; when the unit is normally stopped, closing the pressure relief electromagnetic valve A (015) and the pressure relief electromagnetic valve B (017), and if the judgment result is abnormal stop, executing the step 3.2;
step 3.2, when the unit is abnormally stopped, continuously judging whether the steam turbine is in an accident stop state or a load shedding state, and reacting;
step 3.2.1, if the steam turbine is in a load shedding state, comparing the measured values of the pressure sensor (106) and the power sensor (107) with preset values; if the power of the steam turbine is larger than 50% of rated power and the pressure of the regulating stage measured by the pressure sensor is larger than 60% of rated pressure, the pressure relief solenoid valve A (015) is opened, otherwise, the pressure relief solenoid valve B (017) is opened; when the OPC electromagnetic valve is reset, the pressure relief electromagnetic valve A (015) and the pressure relief electromagnetic valve B (017) are reset;
step 3.2.2, if the steam turbine is in an accident shutdown state, comparing the measured values of the pressure sensor (106) and the power sensor (107) with preset values; if the power of the steam turbine is larger than 50% of rated power and the pressure of the regulating stage is larger than 60% of rated pressure, the pressure relief solenoid valve A (015) is opened, otherwise, the pressure relief solenoid valve B (017) is opened, and the pressure relief solenoid valve A (015) and the pressure relief solenoid valve B (017) are not reset;
step 3.3, judging whether the steam turbine is in a high load state or a low load state, and reacting: the relief pressure of the relief valve A (018) is set to P 1 Setting the relief pressure of relief valve B (019) to P 2 (ii) a When the accident trip or load shedding situation of the steam turbine occurs in a high load state, the pressure relief electromagnetic valve A (015) is opened, and the relief pressure P of the relief valve A (018) is increased 1 Setting according to the set closing time of the regulating valve of the steam turbine; when the steam turbine is in the accident trip or load shedding situation under the low-load state, the pressure relief solenoid valve B (017) is opened, and the overflow pressure P of the overflow valve B (019) is 2 Reference P 1 The set value of the device is adjusted upwards to a certain extent.
CN202210685104.5A 2022-06-16 2022-06-16 Steam turbine regulating valve quick closing and servomotor buffer system Pending CN115182791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210685104.5A CN115182791A (en) 2022-06-16 2022-06-16 Steam turbine regulating valve quick closing and servomotor buffer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210685104.5A CN115182791A (en) 2022-06-16 2022-06-16 Steam turbine regulating valve quick closing and servomotor buffer system

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CN115182791A true CN115182791A (en) 2022-10-14

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