CN217380664U - Novel emergency trip device - Google Patents

Abstract

The utility model discloses a novel emergency trip device; the device is arranged in a high-pressure fire resistant oil EH system of the steam turbine, receives an interruption instruction of an ETS system, and realizes emergency interruption of the steam turbine so as to protect the safety of the steam turbine. The device comprises four AST electromagnetic valve assemblies arranged in series and parallel, and the AST electromagnetic valve assemblies and the ASP throttling assemblies are fixed on the hydraulic manifold block through plate type stop valves. The oil inlet main pipe of the AST electromagnetic valve is provided with the check valve, and each AST electromagnetic valve does not cause emergency obstruction misoperation when acting alone, and does not cause the emergency obstruction device to refuse to act; by closing the plate type stop valve, the throttling hole can be cleaned or replaced on line. The pressure measuring assembly determines whether the device is in a normal working state or not by testing the pressure of each assembly and displaying the pressure, and gives an alarm for an abnormal state.

Description

Novel emergency trip device

Technical Field

The utility model relates to a steam turbine field, more specifically say, relate to a novel emergency trip device.

Background

Since the introduction of the high-pressure fuel-resistant control technology of 600MW and 300MW steam turbines of American West House company in 1985, over 1000 sets of such equipment are operated at present. The high-pressure anti-fuel hydraulic control system (EH) of the steam turbine must meet the basic control, overspeed protection, emergency interruption and other functions of the steam turbine system, namely the EH hydraulic control system comprises an oil supply system, an actuating mechanism and an emergency interruption system. In the control system, the critical interruption system is special equipment for sensing turbine overspeed, abnormal key operation parameters (such as vibration, temperature, vacuum and the like) and other safety system actions, and can automatically interrupt the turbine system to ensure the safe shutdown of the unit. Therefore, the critical interruption system is one of the important links related to the normal and safe operation of the steam turbine. When the gourd ladle is originally introduced, neither a design theoretical basis nor actual experience of operation exists, and the gourd ladle is basically drawn according to the calabash in the Xuanche's of the same book.

The disadvantages and problems of critical interruption systems are becoming more and more pronounced during later operations, maintenance, for example: when the system fails, the system cannot be overhauled and replaced on line in time, error trip is caused during normal operation test, only 'faulty' work can be carried out when the system cannot be stopped, and the like. The user often uses the medicine with a great mind and a gallbladder, so the medicine is bitter. Due to design reasons, the traditional critical interruption system often causes false tripping due to the action of a test solenoid valve; when the equipment is tested on line, once the electromagnetic valve fault is detected, the equipment can only work with diseases under the condition that the equipment unit is not stopped because the equipment needs to be stopped for replacement; meanwhile, when an equipment on-line test is carried out, the ASP pressure is changed due to the fault of the configured throttler, so that the on-line detection of the electromagnetic valve cannot be implemented. The throttler also needs to be overhauled in a unit shutdown state, so that the equipment can only have the splitting test function under the condition that the unit is not shut down, and the unit is subjected to hard bracing in the atmosphere of the lifting core hanging liner. Therefore, the emergency interruption system urgently needs to solve the problem that the steam turbine does not stop in operation to maintain the system on line and replace a hydraulic element, so that the error trip is avoided, the phenomenon of 'faulty' operation of the system is thoroughly solved, and the healthy and safe operation of a unit is ensured.

For example, a "turbine emergency shutdown system" disclosed in chinese patent literature, publication No. CN206190335U includes an isolation valve assembly and an EH system, the isolation valve assembly is disposed on a pipeline between an AST oil pipe and a non-pressure return oil pipe, the non-pressure return oil pipe is connected to an oil tank of the EH system through a pipeline, turbine oil safety oil is input to an upper cavity of the diaphragm valve assembly through an oil inlet pipe, the system further includes a backup diaphragm valve assembly, the upper cavity of the backup diaphragm valve assembly is connected to the turbine oil safety oil pipe, and two ends of the backup diaphragm valve assembly are respectively connected to an ATS oil pipe and the non-pressure return oil pipe. The system has the advantages that the action reliability of the emergency trip system is improved, and the occurrence of severe overspeed accidents of the unit is prevented; the defect of the diaphragm valve component is eliminated on line in the defect state, the flexibility of equipment maintenance is improved through the diaphragm valves which run in parallel, the unit downtime is reduced, and the unit running efficiency and the economic benefit are improved. However, the single solenoid valve is isolated and replaced through the diaphragm valve, the condition that the blocked oil outlet pipe is blocked but pressure alarm does not occur when the throttling device fails in the prior art is ignored, and the online maintenance requirements in various states are difficult to meet.

Disclosure of Invention

Aiming at the problems that the test solenoid valve is easy to cause false tripping, the solenoid valve fails to be replaced on line, the solenoid valve cannot be detected on line when the throttler fails and the like in the prior art, the invention provides a novel emergency shutoff device; the device is arranged in a high-pressure fire resistant oil EH system of the steam turbine, receives an interruption instruction of an ETS system, and realizes emergency interruption of the steam turbine so as to protect the safety of the steam turbine. The device comprises four AST electromagnetic valves which are arranged in series and parallel, and the AST electromagnetic valves and the ASP throttling components are fixed on the hydraulic manifold block through plate type stop valves. The oil inlet main pipe of the AST electromagnetic valve is provided with the check valve, and each AST electromagnetic valve does not cause emergency obstruction misoperation when acting alone, and does not cause the emergency obstruction device to refuse to act; by closing the plate type stop valve, the throttling hole can be cleaned or replaced on line. The pressure measuring assembly determines whether the device is in a normal working state or not by testing the pressure of each assembly and displaying the pressure, and gives an alarm for an abnormal state.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a novel emergency cutoff device comprises four groups of AST electromagnetic valves, two groups of OPC electromagnetic valves and a pressure measuring assembly which are connected in series and in parallel; the AST electromagnetic valve is assembled at the top of the hydraulic manifold block through a plate type stop valve; the OPC electromagnetic valve is assembled at the top of the hydraulic manifold block; the pressure measuring assembly is arranged on the AST electromagnetic valve; the apparatus further comprises an ASP throttling assembly; the ASP throttling component is assembled on the hydraulic manifold block through a plate type stop valve, and a pressure switch is arranged on a communication channel between the ASP throttling component and the AST electromagnetic valve. The device is arranged in a high-pressure fire-resistant oil EH system of the steam turbine, receives an interruption instruction of an ETS system, and realizes emergency interruption of the steam turbine so as to protect the safety of the steam turbine. The device comprises four AST electromagnetic valves which are arranged in series and parallel, and the AST electromagnetic valves and the ASP throttling components are fixed on the hydraulic manifold block through plate type stop valves. The oil inlet main pipe of the AST electromagnetic valve is provided with the check valve, and each AST electromagnetic valve does not cause emergency obstruction misoperation when acting alone, and does not cause the emergency obstruction device to refuse to act; by closing the plate type stop valve, the throttling hole can be cleaned or replaced on line. The pressure measuring assembly determines whether the device is in a normal working state or not by testing the pressure of each assembly and displaying the pressure, and gives an alarm for an abnormal state.

Preferably, the ASP throttling assembly includes an orifice K1 and an orifice K2; a channel is arranged between the orifice K1 and the orifice K2, and the channel penetrates through AST electromagnetic valves which are connected in series; the channel is provided with an ASP pressure switch. Be provided with pressure switch on this passageway, can simply record the pressure state of internal environment through pressure switch, can report to the police to the internal state.

Preferably, the hydraulic manifold block is provided with oil inlet and return internal channels of AST safety oil, OPC safety oil and ASP test oil; the hydraulic manifold block is also provided with an external interface; the oil inlet and return channels and the external interface can convey any signal instrument to be used as a monitoring or control signal.

Preferably, pressure switches are arranged at an oil inlet main pipe of the AST electromagnetic valve, an oil inlet main pipe of the OPC electromagnetic valve and a test oil main pipe of the ASP throttling assembly; pressure gauges are arranged at the oil inlet main pipe of the AST electromagnetic valve, the oil inlet main pipe of the OPC electromagnetic valve and the ASP throttling assembly test oil main pipe; and a pressure transmitter is arranged at the oil inlet main pipe of the AST electromagnetic valve. The effectiveness and the correctness of the action of the solenoid valve are indicated through the pressure gauge and the pressure switch, and the abnormal operation is alarmed through the pressure of the pressure switch.

Preferably, the oil inlet main pipe of the AST electromagnetic valve and the oil inlet main pipe of the OPC electromagnetic valve are both provided with one-way valves. Two check valves are arranged in the hydraulic manifold block, and hydraulic channels of AST safety oil and OPC safety oil are effectively separated.

Preferably, the throttling assembly and the AST electromagnetic valve are provided with pressure measuring joints; the blocking condition of the internal oil conveying pipe can be obtained by testing the internal pressure conditions of the throttling assembly and the AST electromagnetic valve, and online adjustment and maintenance can be carried out according to the fault state.

Preferably, the plate type stop valve assembly is connected with a pressure gauge through an output interface of the pressure measuring assembly, and the pressure gauge comprises a pressure indicated value mark for effectively opening and closing a valve position; the normal critical interruption function of the AST electromagnetic valve can not be influenced due to element faults during online maintenance and replacement.

Preferably, a slide valve is installed on the plate type stop valve; the slide valve comprises a valve plate, a valve rod and an indicating plate; the indicator panel sets up in stop valve one side, and the valve plate passes through the valve rod fixed with the indicator panel, can make switch AST solenoid valve through rotating valve plate and valve rod, and the indicator panel can indicate the valve plate switch position to prevent that the valve rod from being injured or trouble by excessive atress is tensile.

Preferably, the plate-type stop valve is provided with a limit screw, and the mechanical limit device is realized through the limit screw; the valve position can be ensured to be opened and closed in place during online maintenance and replacement.

The beneficial effects of the utility model are that:

1. the design is reliable; the four AST electromagnetic valves are arranged in series and parallel, so that the action of any one electromagnetic valve can not cause the pressure relief of the AST pressure of the unit to cause the error trip during an online test. Meanwhile, in order to prevent the unit from mistakenly tripping due to the pressure relief of a fault electromagnetic valve during the test, each electromagnetic valve is relatively isolated during the test, so that the safety is ensured;

2. allowing online maintenance and replacement; once the electromagnetic valve is confirmed to be in fault by the test, the electromagnetic valve can be overhauled and replaced under the working condition without shutdown due to the action of the isolation valve;

3. the built-in restrictor is removed, the function of an isolation valve is added, and once the restrictor fails, the restrictor can be immediately overhauled and replaced on line.

Drawings

FIG. 1 is a schematic diagram of a hydraulic oil system of a critical trip apparatus of the present invention;

fig. 2 is a front view of a critical interruption device of the invention;

in the figure:

1-hydraulic manifold block; 2-AST electromagnetic valve; 3-ASP throttle assembly, 31-throttle orifice; 4-OPC electromagnetic valve; 5-plate type stop valve, 51-upper plate, 52-middle plate, 53-lower plate; 6-pressure measuring joint; 7-a valve plate; and 8-valve rod.

Detailed Description

It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

The technical scheme of the invention is further specifically described by the following embodiments.

A novel emergency cutoff device comprises four groups of AST electromagnetic valves 2, two groups of OPC electromagnetic valves 4 and a pressure measuring assembly which are connected in series and in parallel; the device receives the interruption instruction of the ETS system in the high-pressure fire-resistant oil EH system of the steam turbine, realizes the emergency interruption of the steam turbine and protects the safety of the steam turbine.

The four groups of AST electromagnetic valves 2 are fixed at the top of the hydraulic manifold block 1 through plate type stop valves 5, and the OPC electromagnetic valves 4 are directly fixed at the top of the hydraulic manifold block 1; and simultaneously, a group of ASP throttling components 3 are fixed at the top of the hydraulic manifold block 1 through plate type stop valves 5. The hydraulic manifold block 1 is made of stainless steel materials or carbon steel, and the surface of the hydraulic manifold block is subjected to surface anticorrosion treatment such as zinc plating passivation and the like; the four AST electromagnetic valves 2 are arranged in series-parallel connection by the hydraulic pipeline channel in the hydraulic manifold block 11, so that the function of the AST electromagnetic valves 2 in an online detection test is conveniently implemented.

The plate type stop valves 5 comprise an upper plate 51, a middle plate 52 and a lower plate 53; five groups of plate-like stop valves 5 sides all are provided with the slide valve, and the slide valve includes valve plate 7, valve rod 8 and indicator plate, and the indicator plate laminating plate-like stop valve 5's medium plate 52 side sets up, and valve plate 7 passes through valve rod 8 and indicator plate and connects, and valve plate 7 and valve rod 8 can the back-and-forth movement to realize opening and closing the function of control valve port. The valve rod 8 and the valve plate 7 are screwed to drive the electromagnetic valve to be closed and opened; the indicating plate can synchronously rotate along with the movement of the valve plate 7 and the valve rod 8, and the lower plate 53 is provided with a limit screw which can limit the rotating position of the indicating plate so as to prevent the valve rod 8 from being excessively stressed and being injured or broken.

Pressure measuring joints are arranged on the AST electromagnetic valve 2 and the ASP throttling component 3; pressure gauges are generally not connected during normal operation. When the AST electromagnetic valve 2 and the throttle hole 31 of the ASP throttle component 3 need to be repaired, the pressure gauge is connected to monitor the correctness and the reliability of the action of the opening and closing valve of the plate type cut-off valve 5. When the pressure gauge displays high pressure, the plate type stop valve 5 is effectively opened; when the pressure gauge displays zero pressure, the plate type stop valve 5 is effectively closed. The plate type stop valve 5 corresponding to the throttle hole 31 is closed, so that the two throttle holes 31 can be repaired or replaced on line.

The AST oil inlet pipe is divided into three branches; the first branch is provided with an ASP throttle assembly 3 comprising a throttle hole K1 and a throttle hole K2, and the branch is provided with a throttle valve K1; the second branch is sequentially provided with an AST electromagnetic valve AST-3 and an AST electromagnetic valve AST-4; the third branch is sequentially provided with an AST electromagnetic valve AST-3 and an AST electromagnetic valve AST-4; in addition, an AST electromagnetic valve AST-1 and an AST electromagnetic valve AST-4 are connected in series; the AST electromagnetic valve AST-2 and the AST electromagnetic valve AST-3 are connected in series; the AST electromagnetic valve AST-1 and the AST electromagnetic valve AST-3 are connected in parallel; the AST electromagnetic valve AST-2 and the AST electromagnetic valve AST-4 are connected in parallel. The emergency interruption device is connected with an oil inlet and an oil return port of the AST safety oil, the four AST electromagnetic valves 2 are arranged in series and parallel, and each AST electromagnetic valve 2 independently acts without causing emergency interruption misoperation or causing the emergency interruption device to refuse to act; therefore, the AST solenoid valve 2 has the function of on-line testing and detection.

A channel is arranged between the throttle hole K1 and the throttle hole K2; the channel is connected between the AST electromagnetic valve AST-1 and the AST electromagnetic valve AST-2; the channel is connected between the AST electromagnetic valve AST-3 and the AST electromagnetic valve AST-4; two groups of ASP pressure switches are arranged between the channels. The two ASP pressure switches, ASP-1 and ASP-2, function to indicate the validity and correctness of the AST solenoid valve 2 operation when the AST solenoid valve 2 is in test operation. When the AST electromagnetic valve AST-1 and the AST electromagnetic valve AST-3 correctly act, the ASP pressure switch ASP-1 acts with high pressure and gives an alarm; when the AST electromagnetic valve AST-2 and the AST electromagnetic valve AST-4 correctly act, the ASP pressure switch ASP-2 acts with low pressure to alarm; if the four AST electromagnetic valves 2 do not act and the ASP pressure switches ASP-1 and ASP-2 have an action alarm, the throttle hole K1 or K2 is in fault, and if the ASP pressure switch ASP-1 has a high-pressure action alarm indication, the throttle hole K2 is in fault; when the ASP pressure switch ASP-2 is in low pressure action alarm, the throttling hole K1 has a fault and needs to be repaired and processed in time. By closing the plate shut-off valve 5, the orifice can be cleaned or replaced online.

Two groups of OPC electromagnetic valves 4 are respectively communicated with the OPC oil inlet pipes; and an AST oil inlet pipe is communicated with the two groups of OPC electromagnetic valves 4 through one-way valves respectively. An OPC pressure switch 63/OPC is placed at the OPC inlet line input.

The HP oil delivery pipe is divided into two branches, the first branch is connected with the AST electromagnetic valve AST-1 and the AST electromagnetic valve AST-2 through a one-way valve, and the second branch is connected with the AST electromagnetic valve AST-3 and the AST electromagnetic valve AST-4 through a one-way valve.

Two sets of check valves are arranged in the hydraulic manifold block 1, and hydraulic channels of AST safety oil and OPC safety oil are effectively separated. When the OPC electromagnetic valve 4 acts, the OPC safe oil is discharged, and the AST safe oil is not influenced due to the unidirectional function; when the AST electromagnetic valve 2 acts, the AST safety oil is discharged, the OPC safety oil is synchronously and quickly discharged due to the action of the one-way valve, all valves of the unit are quickly closed, and the steam turbine is safely stopped.

Pressure switches are arranged at an oil inlet main pipe of the AST electromagnetic valve 2, an oil inlet main pipe of the OPC electromagnetic valve 4 and a test oil main pipe of the ASP throttling assembly 3; pressure gauges are arranged at the oil inlet main pipe of the AST electromagnetic valve 2, the oil inlet main pipe of the OPC electromagnetic valve 4 and the test oil main pipe of the ASP throttling assembly 3; and a pressure transmitter is arranged at the oil inlet main pipe of the AST electromagnetic valve 2. Including an AST pressure switch, an OPC pressure switch 63/OPC, two ASP pressure switches ASP-1, ASP-2. An OPC pressure switch 63/OPC is placed at the OPC inlet line input.

Referring to fig. 1, the critical interruption device of the present invention mainly functions as follows: firstly, the shutoff signal of turbine ETS is received, AST/OPC solenoid valve 4 action, and EH safety oil loses pressure rapidly, and the turbine valve is closed under the spring force effect fast to guarantee the safety of turbine. And secondly, the online test function of the system. In order to ensure the AST electromagnetic valve 2 to operate correctly and quickly, the AST electromagnetic valve 2 must be detected and tested on line in normal operation time of the unit at ordinary times, so that the AST electromagnetic valve 2 cannot be jammed or burnt due to long-time non-operation, and the detection and test once per week is a basic requirement for safe operation of electric power. And thirdly, the online replacement function of the device. Once a failure or fault solenoid valve is found in the test process, the solenoid valves must be immediately repaired or replaced to ensure that the four AST solenoid valves 2 are always in a normal working state, and any one AST solenoid valve 2 is not allowed to be in a fault state. And fourthly, the self-correcting function of the test condition.

The AST solenoid valve 2 is judged on-line by the output action signals of the two ASP pressure switches, and the reference pressures of the two ASP pressure switches are formed by matching the two orifices 31. When the ASP reference pressure value is changed, the two throttle holes 31 must be repaired or replaced immediately, and the ASP reference pressure value must be corrected at any time.

The safety oil provided by the emergency shutoff device mainly has the main function of supplying the safety valve control oil necessary for the actuating mechanism, and the actuating mechanism can accurately act only when the safety oil pressure is established normally.

Claims (9)

1. A novel emergency interruption device is characterized by comprising four groups of AST electromagnetic valves (2), two groups of OPC electromagnetic valves (4) and a pressure measuring assembly which are connected in series and in parallel; the AST electromagnetic valve (2) is assembled at the top of the hydraulic manifold block (1) through a plate type stop valve (5); the OPC electromagnetic valve (4) is assembled at the top of the hydraulic manifold block (1); the pressure measuring assembly is arranged on the AST electromagnetic valve (2); the apparatus further comprises an ASP throttling assembly (3); the ASP throttling component (3) is assembled on the hydraulic manifold block (1) through a plate type stop valve (5), and a pressure switch is arranged on a communication channel between the ASP throttling component (3) and the AST electromagnetic valve (2).

2. A new critical interruption device according to claim 1, characterized in that the ASP throttling unit (3) comprises a throttle hole K1 and a throttle hole K2; a channel is arranged between the throttle hole K1 and the throttle hole K2, and the channel penetrates through and is connected between the AST electromagnetic valves (2) which are connected in series; the channel is provided with an ASP pressure switch.

3. A new critical interruption device according to claim 1, characterized in that the hydraulic manifold block (1) is provided with oil-in and oil-return internal channels for AST safety oil, OPC safety oil, ASP test oil; the hydraulic manifold block (1) is also provided with an external interface.

4. The novel emergency trip device according to claim 1, characterized in that pressure switches are arranged at the oil inlet main pipe of the AST solenoid valve (2), the oil inlet main pipe of the OPC solenoid valve (4), and the test oil main pipe of the ASP throttling assembly (3); pressure gauges are arranged at the oil inlet main pipe of the AST electromagnetic valve (2), the oil inlet main pipe of the OPC electromagnetic valve (4) and the test oil main pipe of the ASP throttling assembly (3); and a pressure transmitter is arranged at the oil inlet main pipe of the AST electromagnetic valve (2).

5. The novel emergency trip device according to claim 1, wherein check valves are arranged at the oil inlet main pipe of the AST solenoid valve (2) and the oil inlet main pipe of the OPC solenoid valve (4).

6. A new critical interruption device according to claim 1, characterized in that pressure taps (6) are provided on the throttling assembly and the AST solenoid valve (2).

7. The new critical trip device according to claim 1, characterized in that the plate shut-off valve (5) is connected to a pressure gauge through the pressure measuring cell output interface.

8. A new type of critical interruption device according to claim 1, characterized in that said plate-type shut-off valve (5) is equipped with a slide valve; the slide valve comprises a valve plate (7), a valve rod (8) and an indicating plate; the indicator board sets up in stop valve one side, and valve plate (7) are fixed with the indicator board through valve rod (8).

9. A new type of critical interruption device according to claim 8, characterized in that the plate-type stop valve (5) is provided with a limit screw.

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