CN211081993U - Steam turbine emergency trip shutdown device capable of automatically supplementing oil - Google Patents

Abstract

A turbine emergency trip shutdown device capable of automatically supplementing oil belongs to the technical field of turbine safety shutdown. The utility model discloses emergency shutoff stop device to current little turboset adopts the cartridge valve form, when the unit stops of beating the floodgate, and the direct flow direction of security personnel oil through the cartridge valve returns oil pipe way, causes the problem that system temperature rised rapidly. The OPC oil circuit is communicated with the GV servomotor, the HP oil circuit provides oil for an EH system of the steam turbine, and the AST oil circuit is communicated with the GV servomotor and the TV servomotor; oil compensation orifices are arranged on pipelines for communicating the OPC oil way, the HP oil way and the AST oil way; the oil pressure display normal value of AST and OPC can be ensured under the state of system brake hanging; the utility model discloses original cartridge valve structure has been got rid of to redesign the pipe connection form, under the circumstances of guaranteeing not to influence normal operating, the volume material and the processing degree of difficulty of the reduction equipment of maximize. The utility model relates to a stop device of small-size turboset.

Description

Steam turbine emergency trip shutdown device capable of automatically supplementing oil

Technical Field

The utility model relates to a can be from steam turbine emergency trip stop device of oil supply belongs to steam turbine safety shutdown technical field.

Background

The emergency trip shutdown device of the steam turbine has the advantages that when the steam turbine is overspeed or other emergency conditions occur, the safety oil pressure of the valve servomotor is quickly discharged, so that the valve is quickly closed to cut off a steam source, and the safe shutdown of the steam turbine is realized; which can prevent the occurrence of a major accident. Therefore, as one of the most important devices in the power generation equipment, the safety and reliability of the shutdown device for the emergency interruption of the steam turbine play an important role in ensuring the normal operation of the whole unit.

In the prior art, a critical interruption shutdown device used by a small turboset with the power of less than 200MW is the same as that used by a large turboset, and is different from that used by a cartridge valve in drift diameter. Because the number of steam valves of a traditional high-power steam turbine is large, under the condition that a unit is in a brake-on state (electromagnetic valve is in power failure and an unloading valve is in an unloading state), the fast closing time of the valves is guaranteed to be within 0.15s, and a large flow area needs to be designed for safety oil paths (AST oil and OPC oil) to guarantee flow. Thus, critical-trip shutdown devices are designed in the form of cartridge valves. In addition, when the large turboset is braked and stopped, the oil flow loss in the system is large. A relatively large displacement hydraulic pump is also required to make up for the lost oil flow. However, the hydraulic pump brings the disadvantage of rapid temperature rise of the system while bringing about large-flow oil supply. In addition, the hydraulic pump is configured, so that the system is complex in structure and large in size, and purchasing and processing costs are increased.

The number of the medium and small turbine valves is less, and is generally within 4. Therefore, the safety oil flow is not large when the steam turbine is opened. If the cartridge valve is still adopted, a 'big horse pulls a trolley' feeling is given. And in the brake opening state, pressure oil directly flows to the oil return pipeline through the electromagnetic valve, so that the flow of the system is greatly increased, and the temperature of the system is rapidly increased.

SUMMERY OF THE UTILITY MODEL

The emergency interceptor stop device to current little turboset adopts the cartridge valve form, when the unit was played the brake and is stopped, the direct flow direction of security oil (AST oil, OPC oil) through the cartridge valve returns oil pipe way, causes the problem that system temperature rised rapidly, the utility model provides a can be from the steam turbine emergency interceptor stop device of mend oil.

The utility model relates to a turbine emergency shut-off stopping device capable of self-supplementing oil, which comprises an OPC oil circuit, an HP oil circuit and an AST oil circuit,

the head end of the OPC oil circuit is used for being communicated with the GV servomotor, the HP oil circuit is used for providing oil for the EH system of the steam turbine, and the head end of the AST oil circuit is used for being communicated with the GV servomotor and the TV servomotor;

the OPC oil path is communicated with the HP oil path through a first branch, the HP oil path is communicated with the AST oil path through a second branch, and the first branch and the second branch are respectively provided with a first oil compensation throttling hole;

the tail end of the OPC oil way is branched into three OPC oil branches, the first OPC oil branch is used for pressure interlocking and monitoring, the second OPC oil branch and the third OPC oil branch are arranged in parallel and used for providing a passage for OPC oil, and the tail ends of the second OPC oil branch and the third OPC oil branch are communicated with an oil return pipeline; a first OPC electromagnetic valve is arranged on the second OPC oil branch, and a second OPC electromagnetic valve is arranged on the third OPC oil branch;

the tail end of the AST oil way is branched into a pressure interlocking and monitoring AST first branch, a first AST oil branch, a second AST oil branch, a third AST oil branch and a fourth AST oil branch, the fourth AST oil branch is connected with the third OPC oil branch through a communicating pipe, and a check valve is arranged on the communicating pipe; the tail ends of the first AST oil branch, the second AST oil branch, the third AST oil branch and the fourth AST oil branch are communicated with an oil return pipeline;

a manual reversing valve is arranged on the fourth AST oil branch; two first AST electromagnetic valves are arranged on the first AST oil branch, two second AST electromagnetic valves are arranged on the third AST oil branch, and two ASP orifices are arranged on the second AST oil branch; nodes are respectively arranged between the two AST electromagnetic valves I, between the two ASP orifices and between the two AST electromagnetic valves II and are simultaneously communicated with the pressure linkage and the AST monitoring branch.

According to the turbine emergency shut-off stopping device capable of self-supplementing oil of the utility model,

the tail end of the first OPC oil branch is provided with two branches, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring.

According to the turbine emergency shut-off stopping device capable of self-supplementing oil of the utility model,

four branches are arranged at the tail end of one branch of the pressure interlocking and monitoring AST, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring.

According to the utility model discloses a can be from steam turbine emergency interruption arrester installation of mend oil, the chain and two branches of monitoring AST of pressure set up three branch, all set up instrument valve, manometer and pressure switch on every branch, are used for realizing the chain and the monitoring of pressure.

The utility model has the advantages that: the utility model discloses when satisfying the fast turn-off time of valve and should guaranteeing within 0.15s, under the shutdown state of AST solenoid valve power-off process, can reduce hydraulic system's under the state of switching off flow loss, reduce the temperature rise in the system, improve hydraulic system's work efficiency, reduce driving motor's power and the discharge capacity of oil pump effectively, simplify the structure of whole equipment, reduced the processing cost of equipment.

The utility model discloses for the great reduction of the stop device valve quantity that current high-power unit adopted, increased two between OPC oil circuit and HP oil circuit and between HP oil circuit and AST oil circuit and mended the oil orifice, can guarantee under the system hangs the floodgate state, AST, OPC oil pressure show normal value.

The utility model discloses the less turbine unit of low power and valve quantity is particularly useful for. Compare the critical interruption stop device of traditional cartridge valve structure, when guaranteeing the valve closing time when opening the floodgate, can effectual material cost of saving and reduce the part processing complexity. The discharge capacity of the main pump can be reduced, the flow of the system in a brake opening state is reduced, and the temperature rise of the system is reduced, so that the operation efficiency of the whole system is improved.

Drawings

FIG. 1 is a hydraulic schematic diagram of a turbine emergency trip shutdown device capable of self-supplying oil according to the present invention;

FIG. 2 is a schematic illustration of the connection of the shut down device to a steam turbine system;

FIG. 3 is an assembly view of the shut down device;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a top view of FIG. 3; in the figure, A is an OPC integrated block formed by an OPC oil circuit and related components thereof, and B is an AST integrated block formed by an AST oil circuit and related components thereof.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

First embodiment, as shown in fig. 1 to 5, the present invention provides a turbine emergency shutdown device capable of self-supplying oil, which includes an OPC oil path 100, an HP oil path 200, and an AST oil path 300,

the head end of the OPC oil circuit 100 is used for being communicated with the GV servomotor, the HP oil circuit 200 is used for providing oil for a turbine EH system, and the head end of the AST oil circuit 300 is used for being communicated with the GV servomotor and the TV servomotor;

the OPC oil path 100 is communicated with the HP oil path 200 through a first branch, the HP oil path 200 is communicated with the AST oil path 300 through a second branch, and the first branch and the second branch are respectively provided with a first oil compensation orifice 410;

the tail end of the OPC oil way 100 is branched into three OPC oil branches, a first OPC oil branch 110 is used for pressure interlocking and monitoring, a second OPC oil branch 120 and a third OPC oil branch 130 are arranged in parallel and used for providing passages for OPC oil, and the tail ends of the second OPC oil branch 120 and the third OPC oil branch 130 are communicated with an oil return pipeline 500; a first OPC electromagnetic valve 121 is arranged on the second OPC oil branch 120, and a second OPC electromagnetic valve 131 is arranged on the third OPC oil branch 130;

the end of the AST oil path 300 is branched into a pressure-interlocked and monitored AST branch 310, a first AST oil branch 320, a second AST oil branch 330, a third AST oil branch 340 and a fourth AST oil branch 350, the fourth AST oil branch 350 is connected with the third OPC oil branch 130 through a communicating pipe, and a check valve 700 is arranged on the communicating pipe; the ends of the first AST oil branch 320, the second AST oil branch 330, the third AST oil branch 340, and the fourth AST oil branch 350 are communicated with an oil return pipe 500;

wherein a manual reversing valve 351 is arranged on the fourth AST oil branch 350; two first AST electromagnetic valves 321 are arranged on the first AST oil branch 320, and two second AST electromagnetic valves 341 are arranged on the third AST oil branch 340, so as to realize a two-or one-and protection mode. Two ASP orifices 420 are provided in the second AST oil branch 330; nodes are respectively arranged between the two first AST electromagnetic valves 321, between the two ASP orifices 420 and between the two second AST electromagnetic valves 341 and are simultaneously communicated with the pressure linkage and the AST monitoring two branches 600.

As shown in fig. 1, the first OPC solenoid valve 121 and the second OPC solenoid valve 131 disposed on the second OPC oil branch 120 and the third OPC oil branch 130 implement redundant configuration of the solenoid valves. The manual reversing valve 351 can realize local manual brake opening, so that the valve can be closed quickly.

This embodiment has carried out new design to the stop device that uses in the small-size steam turbine system, has got rid of original cartridge valve structure to redesign the pipeline connection form, under the circumstances of guaranteeing not to influence normal operating, the volume material and the processing degree of difficulty of the reduction equipment of maximize. The installation, the disassembly and the debugging process are simple and convenient. Referring to fig. 3 to 5, before the equipment leaves the factory, the AST manifold block B, OPC, the manual directional valve 351 and the oil replenishment orifice assembly may be connected by pipelines according to the schematic diagram of fig. 1, and the flushing cover plate may be installed at the solenoid valve installation hole of the manifold block. And after the hydraulic system of the power plant is installed and oil circulation is finished, the OPC electromagnetic valve and the AST electromagnetic valve are reassembled. When the hydraulic control valve operates, the hydraulic motor can realize quick closing of the valve through the action of the electromagnetic valve, and can also realize quick brake opening and quick valve closing through manually pulling the manual reversing valve.

The ASP is a tripping pressure channel, and the ASP oil pressure is used for detecting whether a solenoid valve of the AST channel leaks or not, and is generally half of the AST oil pressure.

Further, as shown in fig. 1 and fig. 2, two branches are disposed at the end of the first OPC oil branch 110, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring. In fig. 1, in the terminal branch of the first OPC oil branch, the square element is a pressure switch; when the OPC oil pressure is lower than 7MPa, the pressure switch triggers linkage; the circular element is a pressure gauge for monitoring the oil pressure. The instrument valve is used for controlling the connection and disconnection of the pipeline and the load cell.

Wherein the HP oil pressure is 14MPa, and AST oil pressure and OPC oil pressure are 13.5 MPa.

Still further, as shown in fig. 1 and fig. 2, four branches are arranged at the end of a branch 310 of the pressure interlocking and monitoring AST, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring. In fig. 1, in the terminal branch of a branch of the pressure interlock and monitoring AST, the square element is a pressure switch; when the AST oil pressure is lower than 7MPa, the pressure switch triggers a linkage (three-out-of-two triggering); the circular element is a pressure gauge for monitoring the oil pressure. The instrument valve is used for controlling the connection and disconnection of the pipeline and the load cell.

Still further, as shown in fig. 1 and fig. 2, the two pressure interlocking and monitoring AST branches 600 are provided with three branches, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring. In fig. 1, in the terminal branches of the two branches of the pressure interlock and monitoring AST, the square element is a pressure switch; when the oil pressure is lower than 4.2MPa, a pressure switch triggers linkage; when the oil pressure is higher than 9.6MPa, a pressure switch triggers the linkage. The circular element is a pressure gauge for monitoring the oil pressure. The instrument valve is used for controlling the connection and disconnection of the pipeline and the load cell.

The utility model discloses in, HP oil circuit 200 indicates high-pressure oil circuit for provide system's oil. For OPC oil circuit 100: when the OPC electromagnetic valve is in an oil way opening state, the OPC oil way is communicated with oil return, and the control oil pressure of the upper cavity of the unloading valve of the high-pressure valve-regulating hydraulic engine, namely the GV hydraulic engine in the figure 2, is discharged. Enabling the GV servomotor to be quickly closed. When the OPC electromagnetic valve is in a state of closing an oil way, the OPC oil way is isolated from return oil, and control oil pressure of an upper cavity of a GV unloading valve of the high-pressure valve-regulating hydraulic machine is established, so that the GV hydraulic machine is ensured to realize normal operation.

For the AST oil path 300: when the AST electromagnetic directional valve is in the open oil path state, the AST oil path is connected with the return oil, the control oil pressure in the upper chamber of the high-pressure main valve servomotor, i.e., the TV servomotor unload valve in fig. 2, is released, and the control oil pressure in the upper chamber of the high-pressure governing valve servomotor, i.e., the GV servomotor unload valve, is released. The two oil motors achieve a quick shut-off. When the AST electromagnetic directional valve is in a state of closing the oil circuit, the AST oil circuit is isolated from the return oil, and the control oil pressure of the upper cavities of the unloading valve of the TV servomotor and the GV servomotor is established. And the normal operation of the servomotor is ensured.

DV in fig. 1 indicates the return line 500 of the system, which communicates with the tank. The first oil compensating orifice 410 is used for compensating hydraulic oil of OPC and AST oil passages, and pressure reduction caused by system leakage is prevented. The manual reversing valve 351 arranged on the fourth AST oil branch 350 can realize the on-off of an AST oil path and return oil in a manual pulling mode, and can realize the quick closing of a TV and a GV oil engine through the manual reversing valve 351 in an emergency state.

The utility model discloses in concrete implementation, support, pressure switch, pipe fitting and manometer etc. that need use, it is the same basically with former steam turbine system's configuration.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (4)

1. The turbine emergency shut-off stopping device capable of self-supplementing oil is characterized by comprising an OPC oil way (100), an HP oil way (200) and an AST oil way (300),

the head end of the OPC oil circuit (100) is used for being communicated with the GV oil-operated machine, the HP oil circuit (200) is used for providing oil for a turbine EH system, and the head end of the AST oil circuit (300) is used for being communicated with the GV oil-operated machine and the TV oil-operated machine;

the OPC oil way (100) is communicated with the HP oil way (200) through a first branch, the HP oil way (200) is communicated with the AST oil way (300) through a second branch, and the first branch and the second branch are respectively provided with a first oil compensation orifice (410);

the tail end of the OPC oil way (100) is branched into three OPC oil branches, a first OPC oil branch (110) is used for pressure interlocking and monitoring, a second OPC oil branch (120) and a third OPC oil branch (130) are arranged in parallel and used for providing a passage for OPC oil, and the tail ends of the second OPC oil branch (120) and the third OPC oil branch (130) are communicated with an oil return pipeline (500); a first OPC electromagnetic valve (121) is arranged on the second OPC oil branch (120), and a second OPC electromagnetic valve (131) is arranged on the third OPC oil branch (130);

the tail end of the AST oil way (300) is branched into a pressure interlocking and monitoring AST first branch (310), a first AST oil branch (320), a second AST oil branch (330), a third AST oil branch (340) and a fourth AST oil branch (350), the fourth AST oil branch (350) is connected with a third OPC oil branch (130) through a communicating pipe, and a check valve (700) is arranged on the communicating pipe; the tail ends of the first AST oil branch (320), the second AST oil branch (330), the third AST oil branch (340) and the fourth AST oil branch (350) are communicated with an oil return pipeline (500);

wherein a manual reversing valve (351) is arranged on the fourth AST oil branch (350); two AST electromagnetic valves (321) are arranged on the first AST oil branch (320), two AST electromagnetic valves (341) are arranged on the third AST oil branch (340), and two ASP orifices (420) are arranged on the second AST oil branch (330); nodes are respectively arranged between the two AST electromagnetic valves (321), the two ASP orifices (420) and the two AST electromagnetic valves (341) and are simultaneously communicated with the pressure linkage and the AST monitoring two branches (600).

2. The self-oiling turbine critical trip shutdown device of claim 1,

the tail end of the first OPC oil branch (110) is provided with two branches, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring.

3. The self-oiling turbine critical trip shutdown device of claim 1,

four branches are arranged at the tail end of a branch (310) of the pressure interlocking and monitoring AST, and each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring.

4. The turbine emergency trip apparatus capable of self-supplying oil according to any of claims 1 to 3, wherein the pressure interlocking and monitoring AST two branch (600) is provided with three branches, each branch is provided with an instrument valve, a pressure gauge and a pressure switch for realizing pressure interlocking and monitoring.

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