CN103982249A

CN103982249A - Emergency trip device capable of isolating testing signal

Info

Publication number: CN103982249A
Application number: CN201410182864.XA
Authority: CN
Inventors: 陆玲; 汤荣贵; 宋德坤
Original assignee: Shanghai Huiyi Control System Co Ltd
Current assignee: Shanghai Huiyi Control System Co Ltd
Priority date: 2014-05-04
Filing date: 2014-05-04
Publication date: 2014-08-13
Anticipated expiration: 2034-05-04
Also published as: CN103982249B

Abstract

The invention discloses an emergency trip device capable of isolating a testing signal, relates to the technical field of controlling a steam turbine, and solves the technical problem for avoiding emergency trip false action. The emergency trip device comprises a cartridge valve, a testing electromagnetic valve, a testing one-way valve, an HP (High Pressure) oil port, an OPC (Overspeed Protection Control) oil port, an AST (Automatic Stop Trip) oil port, a T oil port and two AST valve groups, wherein the OPC oil port is connected to the T oil port through one OPC decompression valve group and is connected to the AST oil port through one OPC one-way valve; a pressure oil port of the testing electromagnetic valve is connected to the HP oil port, an oil return port of the testing electromagnetic valve is connected to the T oil port, and an NC (Normally Closed) working oil port of the testing electromagnetic valve is connected to a control oil port of the cartridge valve; a male port of the cartridge valve is connected to the T oil port through the two AST valve groups, one working oil port of the cartridge valve is connected to the AST oil port, the other working oil port of the cartridge valve is connected to an oil outlet of the testing one-way valve, and an oil inlet of the testing one-way valve is connected to the NC working oil port of the testing electromagnetic valve. The emergency trip device provided by the invention is suitable for an EH (Electric-Hydraulic) control system of a steam turbine.

Description

The emergency trip device of isolation experiment signal

Technical field

The present invention relates to steam turbine control technique, particularly relate to a kind of technology of emergency trip device of isolation experiment signal.

Background technique

EH hydraulic control system is a constituent element in steam turbine digital formula electrohydraulic control system (DEH), is mainly made up of oil supply system (EH petrol station, reclaimer, fire-resistant oil), actuator's (high main oil engine, lofty tone oil engine, middle main oil engine, middle tune oil engine), emergency trip system (emergency trip device, membrane valve), EH low fuel pressure tentative module and oil pipe line system (oil pipe line, high pressure accumulator).

Emergency trip device is one of steam turbine self-protection device, can prevent from that steam turbine is in operation may cause unit that great damage accident occurs because equipment component work is not normal.When steam turbine breaks down need to shut down time, emergency trip device action also releases critical security personnel's oil (AST) and overspeed protection control oil (OPC), closes whole steam valve for steam turbines, makes steam turbine emergency shutdown, to protect Turbine Safety.

But while utilizing simulation test to detect EH hydraulic control system, existing emergency trip device is easily reported malfunction by mistake because of simulation test, thereby causes steam turbine chaser, the safe operation of serious harm steam turbine.

Summary of the invention

For the defect existing in above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of energy isolation simulation stimulus, thereby can avoid, because emergency trip malfunction causes steam turbine chaser, ensureing the emergency trip device of the isolation experiment signal of steam turbine set safe operation.

In order to solve the problems of the technologies described above, the emergency trip device of a kind of isolation experiment signal provided by the present invention, comprises HP hydraulic fluid port, OPC hydraulic fluid port, AST hydraulic fluid port, T hydraulic fluid port, OPC Decompression valves group, OPC one-way valve group, and two AST valve groups;

Described OPC Decompression valves group is made up of at least one OPC solenoid valve, and the filler opening of each OPC solenoid valve is received respectively OPC hydraulic fluid port, and the oil outlet of each OPC solenoid valve is received respectively T hydraulic fluid port;

Described OPC one-way valve group is made up of at least one OPC one-way valve, and the filler opening of each OPC one-way valve is received respectively OPC hydraulic fluid port, and the oil outlet of each OPC one-way valve is received respectively AST hydraulic fluid port;

Described two AST valve groups are respectively an AST valve group, the 2nd AST valve group, and each AST valve group is by least one AST solenoid valve composition, and each AST solenoid valve in same AST valve group is parallel with one another;

It is characterized in that: also comprise cartridge valve, test solenoid valve, test one-way valve;

Described test solenoid valve has a pressure hydraulic fluid port, a return opening and a normally closed actuator port, the pressure hydraulic fluid port of test solenoid valve is received HP hydraulic fluid port, the return opening of test solenoid valve is received T hydraulic fluid port, the control port that the normally closed actuator port of test solenoid valve is received cartridge valve;

Described cartridge valve has a Gong Kou and two actuator ports, receive T hydraulic fluid port through an AST valve group, the 2nd AST valve group successively for public mouthful of cartridge valve, an actuator port of cartridge valve is received AST hydraulic fluid port, another actuator port is received the oil outlet of test one-way valve, and the filler opening of test one-way valve is received the normally closed actuator port of test solenoid valve.

The emergency trip device of isolation experiment signal provided by the invention, utilize cartridge valve, test solenoid valve and test one-way valve to carry out switchover operation mode, thereby by simulation test signal and the isolation of emergency trip oil circuit, the steam turbine chaser causing because of emergency trip malfunction can be avoided, steam turbine set safe operation can be ensured.

Brief description of the drawings

Fig. 1 is the hydraulic diagram of the emergency trip device of the isolation experiment signal of the embodiment of the present invention.

Embodiment

Below in conjunction with brief description of the drawings, embodiments of the invention are described in further detail, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof, all should list protection scope of the present invention in.

As shown in Figure 1, the emergency trip device of a kind of isolation experiment signal that the embodiment of the present invention provides, comprises HP hydraulic fluid port K1, OPC hydraulic fluid port K2, AST hydraulic fluid port K3, T hydraulic fluid port K4, OPC Decompression valves group, OPC one-way valve group, and two AST valve groups;

Described OPC Decompression valves group is made up of two OPC solenoid valve C1, C2, and the filler opening of two OPC solenoid valve C1, C2 is received respectively OPC hydraulic fluid port K2, and the oil outlet of two OPC solenoid valve C1, C2 is received respectively T hydraulic fluid port K4;

Described OPC one-way valve group is made up of two OPC one-way valve D1, D2, and the filler opening of two OPC one-way valve D1, D2 is received respectively OPC hydraulic fluid port K2, and the oil outlet of two OPC one-way valve D1, D2 is received respectively AST hydraulic fluid port K3;

Described two AST valve groups are respectively an AST valve group, the 2nd AST valve group, and an AST valve group is made up of two AST solenoid valve S1, S3 parallel with one another, and the 2nd AST valve group is made up of another two AST solenoid valve S2, S4 parallel with one another;

It is characterized in that: also comprise cartridge valve C1, test solenoid valve A1, test one-way valve D3;

Described test solenoid valve A1 has a pressure hydraulic fluid port, a return opening and a normally closed actuator port, the pressure hydraulic fluid port of test solenoid valve A1 is received HP hydraulic fluid port K1, the return opening of test solenoid valve A1 is received T hydraulic fluid port K4, the control port that the normally closed actuator port of test solenoid valve A1 is received cartridge valve C1;

Described cartridge valve C1 has a Gong Kou and two actuator ports, receive T hydraulic fluid port K4 through an AST valve group, the 2nd AST valve group successively for public mouthful of cartridge valve C1, an actuator port of cartridge valve C1 is received AST hydraulic fluid port K3, another actuator port is received the oil outlet of test one-way valve D3, and the filler opening of test one-way valve D3 is received the normally closed actuator port of test solenoid valve A1.

In other embodiment of the present invention, the OPC solenoid valve quantity in described OPC Decompression valves group also can only have 1, or more than 2, and the filler opening of each OPC solenoid valve receives respectively OPC hydraulic fluid port, and the oil outlet of each OPC solenoid valve is received respectively T hydraulic fluid port.

In other embodiment of the present invention, the OPC one-way valve quantity in described OPC one-way valve group also can only have 1, or more than 2, and the filler opening of each OPC one-way valve receives respectively OPC hydraulic fluid port, and the oil outlet of each OPC one-way valve is received respectively AST hydraulic fluid port.

In other embodiment of the present invention, the AST solenoid valve quantity in each AST valve group also can only have 1, or more than 2, and each AST solenoid valve in same AST valve group is parallel with one another.

In the embodiment of the present invention, described AST hydraulic fluid port K3 is connected to the AST oil pressure table P1 for monitoring AST hydraulic fluid port K3 oil pressure, OPC hydraulic fluid port K2 is connected to the OPC oil pressure table P3 for monitoring OPC hydraulic fluid port K2 oil pressure, the filler opening of test one-way valve D3 is connected to for monitoring AST tests oily pilot pressure oil table P4 and pilot pressure oil sensor P5, on oil circuit between two AST valve groups, be connected to intermediate pressure table P2 and two intermediate pressure sensor P6, P7 for monitoring AST oil intermediate pressure value, T hydraulic fluid port K4 is connected to one for connecting the pressure measuring tie-in Y1 of external monitoring instrument.

The embodiment of the present invention is applicable to the EH hydraulic control system of steam turbine, its usage mode is as follows: the high pressure oil-feed of EH hydraulic control system is received to HP hydraulic fluid port K1, the OPC oil (overspeed protection control oil) that all pitch actuator of EH hydraulic control system is produced is received OPC hydraulic fluid port K2, the OPC oil of the AST oil (critical security personnel's oil) that all Zhu Men actuator of EH hydraulic control system is produced and the generation of all pitch actuator is received AST hydraulic fluid port K3, T hydraulic fluid port K4 is received to the system oil return pipe of EH hydraulic control system, utilize cartridge valve C1 and test solenoid valve A1 to come the source of switched system AST oil,

In the time testing solenoid valve A1 in power failure state, return opening and the normally closed actuator port conducting of test solenoid valve A1, the AST of HP hydraulic fluid port K1 tests oily conductively-closed, the now control port decompression of cartridge valve C1, AST hydraulic fluid port K3 is communicated with the public mouth of cartridge valve C1;

Testing solenoid valve A1 under power failure state, in the time that steam turbine normally moves, each AST solenoid valve S1, S2, S3, S4 all electric cut-off, now the draining passage of AST oil (from AST hydraulic fluid port K3) is plugged, thereby set up AST oil pressure, when steam turbine breaks down need to shut down time, in the one AST valve group and the 2nd AST valve group, respectively there is at least one AST solenoid valve dead electricity conducting, make the draining channel opener of AST oil, also decompression thereupon of AST oil, thereby all steam valves of steam turbine are closed, and steam turbine is also shut down thereupon;

Testing solenoid valve A1 under power failure state, in the time of two OPC solenoid valve C1, the cut-off of C2 dead electricity, the unloading of OPC fluid (from OPC hydraulic fluid port K2) put passage and is plugged, thereby set up OPC oil pressure, in the time that turbine speed reaches 103% rated speed, two OPC solenoid valve C1, C2 must conduct, make unloading of OPC fluid put channel opener, also decompression thereupon of OPC fluid, thereby the servo valve of steam turbine is closed rapidly, OPC one-way valve group can be guaranteed only to release OPC fluid, and it is constant to maintain the oil pressure of AST;

When test solenoid valve A1 is in the time obtaining electricity condition, pressure hydraulic fluid port and the normally closed actuator port conducting of test solenoid valve A1, the AST test oil of HP hydraulic fluid port K1 is loaded into the control port of cartridge valve C1, cartridge valve C1 moves immediately, block the path of AST hydraulic fluid port K3 and each AST solenoid valve S1, S2, S3, S4, thereby while ensureing simulation test, steam turbine set can be because of the action chaser of each AST solenoid valve S1, S2, S3, S4

The now AST of HP hydraulic fluid port K1 test oil is loaded into each S1 of AST solenoid valve, S2, S3, S4 by test one-way valve D3 and cartridge valve C1, now can implement power on/off test to each S1, S2, S3, S4, what in process of the test, release by each S1, S2, S3, S4 is the AST test oil from HP hydraulic fluid port K1, and the impact that is not put to the test of the AST oil of steam turbine set itself.

Claims

1. an emergency trip device for isolation experiment signal, comprises HP hydraulic fluid port, OPC hydraulic fluid port, AST hydraulic fluid port, T hydraulic fluid port, OPC Decompression valves group, OPC one-way valve group, and two AST valve groups;