CN210033541U - Emergency trip device of steam turbine - Google Patents
Emergency trip device of steam turbine Download PDFInfo
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- CN210033541U CN210033541U CN201920734686.5U CN201920734686U CN210033541U CN 210033541 U CN210033541 U CN 210033541U CN 201920734686 U CN201920734686 U CN 201920734686U CN 210033541 U CN210033541 U CN 210033541U
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Abstract
The utility model provides a steam turbine emergency trip device, two AST valves are AST valve group and AST valve group respectively, each AST valve group includes two AST solenoid valves connected in parallel, each AST solenoid valve is connected with a two-way logic cartridge valve in series; an ASP pressure transmitter is connected on an oil path between the AST valve bank and the AST valve bank; the OPC valve group comprises two OPC electromagnetic valves which are connected in parallel, and each OPC electromagnetic valve is connected with a two-way logic cartridge valve in series; the AST solenoid valve and the OPC solenoid valve have the same structure and respectively comprise a pressure oil port, an oil return port and a normally closed working oil port, and the two-way logical cartridge valve have the same structure and respectively comprise a control oil port, a male port and two working oil ports; the pressure oil ports are all connected to the HP oil port, the oil return ports are all connected to the DV oil port, and the normally closed working oil ports are all connected to the control oil port; the male ports are connected to DV oil ports, the working oil ports are connected to AST oil ports, and the other working oil ports are connected to normally closed working oil ports; the system has the functions of remote accurate monitoring, fault diagnosis and fault maintenance.
Description
Technical Field
The utility model belongs to the technical field of steam turbine control, concretely relates to steam turbine emergency trip device.
Background
At present, a high-pressure fire-resistant oil regulating system used in the existing steam turbine industry provides regulating and protecting effects for normal operation of a steam turbine. The emergency breaking device is a protection device for protecting the normal operation and the emergency stop of the steam turbine in the high-pressure fire-resistant oil system. The emergency breaking device has two protection functions, namely Overspeed Protection (OPC), wherein when the rotating speed of the steam turbine reaches an overspeed protection fixed value, the OPC performs protection action, closes a high-pressure regulating steam valve, cuts off the steam inlet quantity, reduces the rotating speed of the steam turbine, but cannot stop the steam turbine; and two critical interruption (AST), when the steam turbine runs, triggering a fixed shutdown protection value and an AST protection action, cutting off a main steam valve, closing all steam inlets such as a high-pressure regulating steam valve and the like, and immediately stopping the steam turbine. When the device is designed, the AST electromagnetic valve adopts a structure that four electromagnetic valves are connected in series and in parallel for long-term live working, so that the function of detecting whether the electromagnetic valve fails in an online test can be realized; the OPC electromagnetic valve adopts a redundant design. Because the AST solenoid valve is the long-term live working, because of supply voltage's unstability and long-term live working, this solenoid valve fault rate is higher. The emergency breaking device adopts modularized high integration, and a fault point can not be accurately judged and does not have an online monitoring function.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steam turbine emergency trip device to the solenoid valve fault rate of solving current steam turbine emergency trip device is higher, can not effectual on-line monitoring's problem.
The utility model provides a following technical scheme:
a turbine emergency cutoff device comprises an AST oil port, an OPC oil port, a DV oil port, an HP oil port, two AST valve banks and an OPC valve bank; the two AST valve banks are respectively a first AST valve bank and a second AST valve bank, each AST valve bank comprises two AST electromagnetic valves which are connected in parallel, and each AST electromagnetic valve is connected with a first two-way logic cartridge valve in series; an ASP pressure transmitter is connected on an oil path between the first AST valve bank and the second AST valve bank; the OPC valve bank comprises two OPC electromagnetic valves which are connected in parallel, and a second two-way logic cartridge valve is connected to each OPC electromagnetic valve in series; the AST solenoid valve and the OPC solenoid valve have the same structure and respectively comprise a pressure oil port, an oil return port and a normally closed working oil port, and the first two-way logical cartridge valve and the second two-way logical cartridge valve have the same structure and respectively comprise a control oil port, a male port and two working oil ports; the pressure oil ports are all connected to the HP oil port, the oil return ports are all connected to the DV oil port, and the normally-closed working oil ports are all connected to the control oil port; the male ports are connected to the DV oil ports, one working oil port is connected to the AST oil port, and the other working oil port is connected to the normally closed working oil port; and a check valve is connected in series between the AST oil port and the OPC oil port.
Furthermore, the steam turbine emergency trip device further comprises a signal acquisition terminal and a wireless transceiver module, wherein the signal acquisition terminal is respectively connected with the AST electromagnetic valve, the OPC electromagnetic valve, the first two-way logic cartridge valve, the second two-way logic cartridge valve and the ASP transmitter through RS485 communication cables.
Furthermore, the AST solenoid valve, the OPC solenoid valve, the first two-way logic cartridge valve and the second two-way logic cartridge valve are provided with signal feedback of valve core positions.
Furthermore, the wireless transceiver module is an NB-IoT communication module, and the NB-IoT communication module is externally connected to the remote monitoring terminal through a wireless network.
Furthermore, a stop valve is connected between the oil return port and the DV oil port.
The utility model has the advantages that:
the utility model relates to a steam turbine emergency breaking device, the case position that acquires solenoid valve AST1, solenoid valve AST2, solenoid valve AST3 and solenoid valve AST4 through the signal acquisition terminal carries out on-line monitoring to it, monitors the ASP oil pressure through ASP pressure transmitter P simultaneously, and dual monitoring guarantees the accuracy of final monitoring result to send to far-end monitor terminal through wireless transceiver, realize long-range real-time accurate monitoring;
the two-way logic cartridge valve D1, the two-way logic cartridge valve D2, the two-way logic cartridge valve D3, the two-way logic cartridge valve D4, the two-way logic cartridge valve D5, and the two-way logic cartridge valve D6 are cross-compared with the valve positions of the solenoid valve AST1, the solenoid valve AST2, the solenoid valve AST3, and the solenoid valve AST4, thereby performing a failure diagnosis function and a failure inspection function.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
Detailed Description
As shown in fig. 1, the emergency trip device of the steam turbine comprises an AST oil port, an OPC oil port, a DV oil port, an HP oil port, two AST valve sets and an OPC valve set; the two AST valve banks are respectively a first AST valve bank and a second AST valve bank, each AST valve bank comprises two AST electromagnetic valves which are connected in parallel and respectively are an electromagnetic valve AST1, an electromagnetic valve AST2, an electromagnetic valve AST3 and an electromagnetic valve AST 4; the OPC valve group comprises two parallel OPC electromagnetic valves, namely an electromagnetic valve OPC1 and an electromagnetic valve OPC 2;
each AST electromagnetic valve is connected with a first two-way logic cartridge valve in series, which is a two-way logic cartridge valve D1, a two-way logic cartridge valve D2, a two-way logic cartridge valve D3 and a two-way logic cartridge valve D4 respectively; an ASP pressure transmitter P is connected on an oil path between the first AST valve bank and the second AST valve bank; each OPC electromagnetic valve is connected with a second two-way logic cartridge valve in series, which is a two-way logic cartridge valve D5 and a two-way logic cartridge valve D6 respectively;
the AST solenoid valve and the OPC solenoid valve have the same structure and respectively comprise a pressure oil port, an oil return port and a normally closed working oil port, and the first two-way logical cartridge valve and the second two-way logical cartridge valve have the same structure and respectively comprise a control oil port, a male port and two working oil ports; the pressure oil ports are all connected to the HP oil port, the oil return ports are all connected to the DV oil port, and the normally closed working oil ports are all connected to the control oil port; the male ports are connected to DV oil ports, one working oil port is connected to AST oil port, and the other working oil port is connected to a normally closed working oil port; a check valve E7 is connected in series between OPC oil ports of the AST oil port, and stop valves C1, C2, C3, C4, C5 and C6 are connected between the oil return port and the DV oil port; a one-way valve E1, a one-way valve E2, a one-way valve E3, a one-way valve E4, a one-way valve E5 and a one-way valve E6 are connected between the male ports and the DV oil port;
the emergency cutoff device of the steam turbine further comprises a signal acquisition terminal and a wireless transceiving module, wherein the signal acquisition terminal is respectively fed back with signals of valve core positions of the AST electromagnetic valve, the OPC electromagnetic valve, the first two-way logic cartridge valve, the second two-way logic cartridge valve and the ASP transmitter through RS485 communication cables, the AST electromagnetic valve, the OPC electromagnetic valve, the first two-way logic cartridge valve and the second two-way logic cartridge valve are all provided with signals of the valve core positions, the wireless transceiving module is an NB-IoT communication module, and the NB-IoT communication module is externally connected to the remote monitoring terminal through a wireless network.
The working process of the specific embodiment is as follows:
the electromagnetic valve AST1, the electromagnetic valve AST2, the electromagnetic valve AST3 and the electromagnetic valve AST4 work as long strips of electricity, when the steam turbine set is in fault shutdown, the electricity is switched to a shutdown position, the oil pressure of an AST oil port is removed, a steam inlet valve of the steam turbine set is closed, and shutdown is achieved. When the electromagnetic valve AST1, the electromagnetic valve AST2, the electromagnetic valve AST3 and the electromagnetic valve AST4 work normally, the valve core is always in the electrified working position, and the values of the ASP oil pressure and the ASP pressure transmitter P are in the working range value.
The online self-diagnosis function is divided into two parts:
the first is real-time process monitoring, the long-term live coil working condition of the AST electromagnetic valve is monitored, and the signal feedback of the valve core positions of the electromagnetic valve AST1, the electromagnetic valve AST2, the electromagnetic valve AST3 and the electromagnetic valve AST4 is acquired through a signal acquisition terminal. During normal work, solenoid valve AST1, solenoid valve AST2, solenoid valve AST3 and solenoid valve AST4 are because of the coil is got electric, the case is in the operating position, when the coil damages, the case is under the effect of spring force, switch to the closed position, the signal acquisition terminal is fed back to the case position, solenoid valve AST1 has been led simultaneously, solenoid valve AST2, solenoid valve AST3 and solenoid valve AST4 case have switched operating position, can cause ASP oil pressure to change and feed back signal acquisition terminal through ASP pressure transmitter P, the feedback of two kinds of signals, can eliminate the wrong report, accomplish accurate judgement and confirm trouble AST solenoid valve, and send the signal to far-end monitor terminal through wireless transceiver module, the remote end on-line monitoring of being.
And secondly, online operation diagnosis, the critical interruption device is very important as an emergency shutdown protection device of the steam turbine, and whether the protection function is normal needs to be tested regularly online. The AST electromagnetic valve and the two-way logic cartridge valve are provided with valve core position monitoring, during on-line test, the AST electromagnetic valve is in power-off action, the valve core of the AST electromagnetic valve and the two-way logic cartridge valve are required to leave working positions and can be monitored through the valve core positions, ASP oil pressure change is caused at the same time, and the ASP pressure transmitter monitors that the changed pressure value exceeds the working oil pressure range.
When the AST electromagnetic valve is in power-off action (the valve core is monitored to be in a closed position through the position of the valve core), the ASP oil pressure is still in a normal working range, and the jamming fault of the valve core of the two-way logic cartridge valve can be judged (the jamming fault can be monitored through the position of the valve core).
When the AST electromagnetic valve is powered off (the valve core is monitored to be in the working position through the position of the valve core), the ASP oil pressure is in a normal range, the valve core of the two-way logic cartridge valve does not act, and the jamming fault of the valve core of the AST electromagnetic valve can be judged.
The working state of the interruption protection device can be accurately judged on line by monitoring the valve core position of the AST electromagnetic valve, the valve core position of the two-way logic cartridge valve and the ASP oil pressure value.
The online maintenance function: considering that the failure rate of the electromagnetic valve of the protection device is high, an online maintenance function is designed for maintenance of the electromagnetic valve during optimization design. When the AST electromagnetic valve fault is detected through the online diagnosis function, the valve core of the two-way cartridge valve can be limited to the working position through the valve core limiting function on the two-way cartridge valve. So as to avoid misoperation and machine set halt. And then the oil inlet stop valve in front of the electromagnetic valve is closed, and a one-way valve isolation oil return loop is arranged on an oil return path of the electromagnetic valve. The solenoid valve can be dismantled at this moment, maintain the change. After the replacement is finished, the oil inlet stop valve is opened, the two-way cartridge valve core limiting function is contacted, and the interdiction protection device returns to a normal working state at the moment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The emergency cutoff device of the steam turbine is characterized by comprising an AST oil port, an OPC oil port, a DV oil port, an HP oil port, two AST valve banks and an OPC valve bank;
the two AST valve banks are respectively a first AST valve bank and a second AST valve bank, each AST valve bank comprises two AST electromagnetic valves which are connected in parallel, and each AST electromagnetic valve is connected with a first two-way logic cartridge valve in series; an ASP pressure transmitter is connected on an oil path between the first AST valve bank and the second AST valve bank; the OPC valve bank comprises two OPC electromagnetic valves which are connected in parallel, and a second two-way logic cartridge valve is connected to each OPC electromagnetic valve in series;
the AST solenoid valve and the OPC solenoid valve have the same structure and respectively comprise a pressure oil port, an oil return port and a normally closed working oil port, and the first two-way logical cartridge valve and the second two-way logical cartridge valve have the same structure and respectively comprise a control oil port, a male port and two working oil ports; the pressure oil ports are all connected to the HP oil port, the oil return ports are all connected to the DV oil port, and the normally-closed working oil ports are all connected to the control oil port; the male ports are connected to the DV oil ports, one working oil port is connected to the AST oil port, and the other working oil port is connected to the normally closed working oil port; and a check valve is connected in series between the AST oil port and the OPC oil port.
2. The turbine emergency trip device of claim 1, further comprising a signal acquisition terminal and a wireless transceiver module, wherein the signal acquisition terminal is connected to the AST solenoid valve, the OPC solenoid valve, the first two-way logic cartridge valve, the second two-way logic cartridge valve, and the ASP transmitter via RS485 communication cables, respectively.
3. The turbine emergency trip device of claim 2, wherein the AST solenoid valve, the OPC solenoid valve, the first two-way logic cartridge valve, and the second two-way logic cartridge valve each have a spool position signal feedback.
4. The turbine emergency trip device according to claim 2, wherein the wireless transceiver module is an NB-IoT communication module, and the NB-IoT communication module is externally connected to a remote monitoring terminal through a wireless network.
5. The turbine critical trip unit of claim 1 wherein a stop valve is connected between the scavenge port and the DV port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920734686.5U CN210033541U (en) | 2019-05-21 | 2019-05-21 | Emergency trip device of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920734686.5U CN210033541U (en) | 2019-05-21 | 2019-05-21 | Emergency trip device of steam turbine |
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| Publication Number | Publication Date |
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| CN210033541U true CN210033541U (en) | 2020-02-07 |
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| CN201920734686.5U Active CN210033541U (en) | 2019-05-21 | 2019-05-21 | Emergency trip device of steam turbine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271136A (en) * | 2020-03-20 | 2020-06-12 | 浙江华元汽轮机械有限公司 | Quick-shutdown control system with emergency safety device |
| CN111535875A (en) * | 2020-03-20 | 2020-08-14 | 浙江华元汽轮机械有限公司 | Shut down valves of two shut down are got to four |
| CN111749735A (en) * | 2020-06-10 | 2020-10-09 | 大连华冶联自动化有限公司 | Manual ETS method for centralized control of steam turbine set |
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
-
2019
- 2019-05-21 CN CN201920734686.5U patent/CN210033541U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271136A (en) * | 2020-03-20 | 2020-06-12 | 浙江华元汽轮机械有限公司 | Quick-shutdown control system with emergency safety device |
| CN111535875A (en) * | 2020-03-20 | 2020-08-14 | 浙江华元汽轮机械有限公司 | Shut down valves of two shut down are got to four |
| CN111535875B (en) * | 2020-03-20 | 2024-05-17 | 浙江华元汽轮机械有限公司 | Four-taking two-speed stop valve group |
| CN111271136B (en) * | 2020-03-20 | 2024-05-17 | 浙江华元汽轮机械有限公司 | Quick shut-down control system with critical security device |
| CN111749735A (en) * | 2020-06-10 | 2020-10-09 | 大连华冶联自动化有限公司 | Manual ETS method for centralized control of steam turbine set |
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
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