CN214409686U

CN214409686U - Direct-current oil pump starting control system based on DCS

Info

Publication number: CN214409686U
Application number: CN202120929965.4U
Authority: CN
Inventors: 张贞; 潘殿清; 何垚年; 杨君君; 罗建超; 张来斌; 谭宇锋; 周文军; 胡炜; 韩凯; 王宝超; 孙洪洋
Original assignee: Huaneng Beijing Thermal Power Co Ltd
Current assignee: Huaneng Beijing Thermal Power Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-10-15
Anticipated expiration: 2031-04-30

Abstract

The embodiment of the utility model provides a direct current oil pump starts control system based on DCS system, including on the spot change-over switch, control switch, auxiliary relay K6 and respectively through the hard hand that control switch and power electricity are even open and shut control loop, start control loop on the spot, DCS start control loop, DCS stop control loop and warning circuit; the local switch sends a signal to the DCS, and the DCS generates a remote control signal; controlling a power switch to send a signal to a reservation system, and generating a power normal signal by the reservation system; the remote control signal is connected with the normal signal of the power supply in series, and is inverted by the normally closed contact of the intermediate relay K6 and then is merged into an alarm loop. The utility model can realize the mutual independence of three starting/stopping control modes of 'hard hand operation starting/stopping', 'DCS starting/stopping' and 'on-site starting/stopping' of the direct-current oil pump based on the control of the DCS system, and is convenient for the operator to remember the operation guide; and the direct current oil pump starting control system has a perfect DCS alarm function.

Description

Direct-current oil pump starting control system based on DCS

Technical Field

The utility model relates to a steam turbine direct current oil pump technical field particularly, relates to a direct current oil pump start control system based on DCS system.

Background

The turbine direct-current oil pump is controlled by a Distributed Control System (DCS), and the main Control mode is as follows: the direct-current oil pump is set to be in a self-starting mode on the DCS, and when the lubricating oil pressure of the steam turbine is lower than 0.065MPa, the DCS controls the direct-current oil pump to automatically start running; and when the lubricating oil pressure of the steam engine is higher than 0.095MPa, controlling the direct-current oil pump to automatically stop running. However, in the prior art, there is no "remote/stop/local start" status determination in the DCS operation module, and as long as the position of the device transfer switch related to the "remote/stop/local" transfer switch in the DCS system is not in the "remote" status, the DCS operation panel of the device will issue an "electrical fault" alarm. In addition, although the 'REMOTE/OFF/ON' change-over switches are arranged in the starting discs of the direct-current lubricating oil pump and the direct-current sealed oil pump of the steam turbine, a REMOTE signal is not introduced into the DCS, so that when the change-over switches are in the REMOTE or OFF positions, the DCS picture cannot judge the state of the change-over switches, for example, when the change-over switches are switched to the OFF positions by mistake, the DCS does not have any abnormal alarm, and at the moment, the backup interlocking logic of the direct-current oil pump DCS is failed to play a corresponding role.

In addition, no power supply normal monitoring signal exists in the DCS operation module of the steam turbine direct-current oil pump. The control power supply and the power supply are both two-stage power supplies, the control loop feeder power supply is taken from a unit direct-current 110V feeder screen, the power loop feeder power supply is taken from a unit 220V direct-current feeder screen, and a control loop incoming switch and a power loop incoming switch are arranged in a local control panel. In the same way, the direct-current sealing oil pump of the steam engine also has the hidden trouble.

Disclosure of Invention

The present description provides a dc oil pump start control system based on DCS system for overcoming at least one technical problem existing in the prior art.

According to the embodiment of the specification, a direct-current oil pump starting control system based on a DCS (distributed control system) is provided, and comprises an on-site selector switch, a control power switch, an intermediate relay K6, a hard-hand-operated starting and stopping control loop, an on-site starting control loop, a DCS stopping control loop and an alarm loop; the hard hand operation start-stop control loop, the local start control loop, the DCS stop control loop and the alarm loop are electrically connected with a power supply through the control power switch respectively; the local switch sends a signal to the DCS system, and the DCS system generates a remote control signal; the control power switch sends a signal to the reservation system, and the reservation system generates a power normal signal; the remote control signal is connected with the normal signal of the power supply in series, and is inverted by a normally closed contact of an intermediate relay K6 and then is merged into the alarm loop.

Preferably, the hard-hand operation start-stop control loop comprises a hard-hand operation start button, a start relay K4, an emergency stop button, a start relay K5, a start relay KM1 and a start relay KM 2;

the hard hand operation starting button normally-open node is connected with the emergency stop button normally-closed node and the starting relay K4 in series; the normally open node of the starting relay K4 is connected in parallel with the normally open node of the hard hand operation starting button; the normally open node of the starting relay K4 is connected with the normally closed node of the emergency stop button and the starting relay K5 in series, and the normally open node of the starting relay K4, the normally closed node of the emergency stop button and the starting relay K5 are connected with the normally open node of the hard hand operation starting button, the normally closed node of the emergency stop button and the starting relay K4 in parallel; the normally open node of the starting relay K5 is connected with the starting relay KM1 in series, and the normally open node of the starting relay K5 and the starting relay KM1 are connected with the normally open node of the hard hand-operated starting button, the normally closed node of the emergency stop button and the starting relay K4 in parallel; the starting relay KM2 is connected in parallel with the starting relay KM 1.

Preferably, the local starting control loop comprises a local switch, an emergency stop button, a starting relay K5, a starting relay KM1 and a starting relay KM 2;

the ON node of the local change-over switch is connected with the normally closed node of the emergency stop button and the starting relay K5 in series; the normally open node of the starting relay K5 is connected with the starting relay KM1 in series, and the normally open node of the starting relay K5 and the starting relay KM1 are connected with the ON node of the local switch, the normally closed node of the emergency stop button and the starting relay K5 in parallel; the starting relay KM2 is connected in parallel with the starting relay KM 1.

Preferably, the DCS starting control loop comprises a DCS system starting instruction normally-open node, a local selector switch, a DCS stopping relay K2, a DCS starting relay K1, an emergency stop button, a starting relay K5, a starting relay KM1 and a starting relay KM 2;

the DCS system starting instruction normally-open node is connected in series with a REMOTE node of the local transfer switch, a DCS stop relay K2 normally-closed node and a DCS start relay K1; the DCS starting relay K1 normally-open node is connected in parallel with the DCS system starting instruction normally-open node; the DCS starting relay K1 normally open node is connected with the emergency stop button normally closed node and the starting relay K5 in series, and the DCS starting relay K1 normally open node, the emergency stop button normally closed node, the starting relay K5 and the DCS system starting instruction normally open node, the REMOTE node of the local switch, the DCS stop relay K2 normally closed node and the DCS starting relay K1 are connected in parallel; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5, the normally open node of the starting relay KM1 are connected in parallel with the normally open node of the DCS starting instruction, the REMOTE node of the local switch, the normally closed node of the DCS stopping relay K2 and the DCS starting relay K1; the starting relay KM2 is connected in parallel with the starting relay KM 1.

Preferably, the DCS stop control loop comprises a DCS system starting instruction normally-open node, a DCS stop relay K2, a DCS start relay K1, an emergency stop button, a local switch, a start relay K5, a start relay KM1 and a start relay KM 2;

the DCS system stop instruction normally-open node is connected in series with the DCS stop relay K2; the DCS starting relay K1 normally-open node is connected with the emergency stop button and the starting relay K5 in series, and the DCS starting relay K1 normally-open node, the emergency stop button and the starting relay K5 are connected with the DCS system stop instruction normally-open node and the DCS stop relay K2 in parallel; the DCS starting relay K1 normally open node is connected in series with the REMOTE node of the local transfer switch, the DCS stopping relay K2 normally closed node and the DCS starting relay K1, and the DCS starting relay K1 normally open node, the REMOTE node of the local transfer switch, the DCS stopping relay K2 normally closed node and the DCS starting relay K1 are connected in parallel with the DCS system stop instruction normally open node and the DCS stopping relay K2; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5, the normally open node of the starting relay KM1 are connected in parallel with the DCS stop instruction normally open node and the DCS stop relay K2; the starting relay KM2 is connected in parallel with the starting relay KM 1.

Preferably, the direct-current oil pump starting control system further comprises a control power supply monitoring relay K3, a loop fault monitoring relay 30X, a starting relay KM1, a soft start loop monitoring relay 48T and soft start loop contactors KM 11-KM 16;

the control power supply monitoring relay K3 is electrically connected with a power supply through the control power supply switch; the soft-start circuit monitoring relay 48T is connected with the normally closed node of the starting relay KM1 and the normally open nodes of the soft-start circuit contactors KM 11-KM 16 in series, and the normally closed node of the soft-start circuit monitoring relay 48T, the normally closed node of the starting relay KM1 and the normally open nodes of the soft-start circuit contactors KM 11-KM 16 are connected with the control power supply monitoring relay K3 in parallel; the loop fault monitoring relay 30X is connected with the delay normally open node of the soft-start loop monitoring relay 48T in series, and the loop fault monitoring relay 30X and the delay normally open node of the soft-start loop monitoring relay 48T are connected with the control power supply monitoring relay K3 in parallel; the normally open node of the control power switch release is connected with the delay normally open node of the soft start loop monitoring relay 48T in parallel.

Further preferably, one end of the intermediate relay K6 is electrically connected to the power supply normal signal, and the other end is electrically connected between the circuit failure monitor relay 30X and the control power supply monitor relay K3.

Further preferably, the DCS system generates a fault alarm signal, and the normally open node of the loop fault monitoring relay 30X is connected to the fault alarm signal; the normally closed node of the intermediate relay K6 is connected in parallel with the normally open node of the loop fault monitoring relay 30X.

Preferably, the direct-current oil pump starting control system further comprises an operation indicator light; the normally open node of the starting relay KM1 is connected in series with the operation indicating lamp.

Preferably, the direct-current oil pump starting control system further comprises a stop indicator light; the normally closed node of the starting relay KM1 is connected in series with the stop indicator lamp, and the normally closed node of the starting relay KM1, the stop indicator lamp, the normally open node of the starting relay KM1 and the running indicator lamp are connected in parallel.

By applying the embodiment of the specification, three starting/stopping control modes of 'hard hand operation starting/stopping', 'DCS starting/stopping' and 'local starting/stopping' of the direct-current oil pump based on DCS system control can be mutually independent, the operation is simple, the memory is easy, an operator can conveniently know and master the operation key, and misoperation under the accident condition is prevented. Meanwhile, the direct-current oil pump starting control system has a perfect DCS alarm function, and solves the problems that the original control panel is connected into the DCS system, the control and power supply are abnormal, and the DCS system cannot trigger abnormal alarm when the state of a control loop change-over switch is abnormal. And the 'electrical fault' alarm of the DCS is completed through optimization and transformation when the direct-current oil pump starting circuit is abnormal, so that production personnel can find and process the fault in time, the safety and reliability of the direct-current oil pump starting circuit can be improved, the accidents of main equipment broken shaft burning or hydrogen leakage caused by incapability of starting the direct-current oil pump in an accident situation are avoided, and the operation safety is greatly improved.

The innovation points of the embodiment of the specification comprise:

1. this direct current oil pump start control system can carry out the optimization of internal control circuit with the direct current oil pump start-up dish that is applicable to TCS control system and reform transform, forms the direct current oil pump start-up dish that is applicable to based on the DCS system, guarantees that the control circuit of former start-up dish starts, stops the normal use of correlation function, and the transformation cost is low, and the construction is simple, greatly reduced investment cost.

2. The direct-current oil pump starting control system realizes mutual independence of three starting/stopping control modes of 'hard hand operation starting/stopping', 'DCS starting/stopping' and 'local starting/stopping' of the direct-current oil pump based on the control of the DCS system, so that the starting and the stopping are convenient, the operation is simple, the memory is easy, an operator can conveniently know and master the operation, and the misoperation can be effectively prevented under the accident condition.

3. The problem that the DCS system cannot trigger abnormal alarm when the original control panel is connected with the DCS system and the power supply and the control loop change-over switch are abnormal is solved. And the 'electrical fault' alarm of the DCS is completed through optimization and transformation when the direct-current oil pump starting circuit is abnormal, so that production personnel can find and process the fault in time, the safety and reliability of the direct-current oil pump starting circuit can be improved, and the accidents of main equipment shaft breakage or hydrogen leakage caused by incapability of starting the direct-current oil pump in a combined mode under the accident condition are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic wiring diagram of a dc oil pump start control system based on a DCS system provided in an embodiment of the present specification.

Detailed Description

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

It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The embodiment of the specification discloses a direct current oil pump starting control system based on a DCS system. Fig. 1 is a diagram illustrating a dc oil pump start control system based on a DCS system according to an embodiment of the present disclosure, and the following is described in detail with reference to fig. 1.

The direct-current oil pump starting control system based on the DCS comprises an on-site selector switch, a control power switch, an intermediate relay K6, a hard-hand-operated starting and stopping control loop, an on-site starting control loop, a DCS stopping control loop and an alarm loop; the hard hand operation start-stop control loop, the local start control loop, the DCS stop control loop and the alarm loop are respectively and electrically connected with the power supply through the control power switch; the local switch sends a signal to the DCS, and the DCS generates a remote control signal; controlling a power switch to send a signal to a reservation system, and generating a power normal signal by the reservation system; the remote control signal is connected with the normal signal of the power supply in series, and is inverted by the normally closed contact of the intermediate relay K6 and then is merged into an alarm loop.

In a specific embodiment, the dc oil pump start control system may further include a control power supply monitoring relay K3, a loop fault monitoring relay 30X, a start relay KM1, a soft start loop monitoring relay 48T, and soft start loop contactors KM 11-KM 16. Specifically, the control power supply monitoring relay K3 is electrically connected with the power supply through a control power supply switch; the soft-start circuit monitoring relay 48T is connected with a normally closed node of the starting relay KM1 and a normally open node of the soft-start circuit contactor KM 11-KM 16 in series, and the soft-start circuit monitoring relay 48T, the normally closed node of the starting relay KM1, the normally open node of the soft-start circuit contactor KM 11-KM 16 are connected with the control power supply monitoring relay K3 in parallel; the circuit fault monitoring relay 30X is connected with the delay normally open node of the soft start circuit monitoring relay 48T in series, and the circuit fault monitoring relay 30X and the delay normally open node of the soft start circuit monitoring relay 48T are connected with the control power supply monitoring relay K3 in parallel; the normally open node of the control power switch release is connected in parallel with the delay normally open node of the soft start loop monitoring relay 48T.

Further, one end of the intermediate relay K6 is electrically connected to the power supply normal signal, and the other end is electrically connected between the circuit failure monitor relay 30X and the control power supply monitor relay K3, i.e., the control power supply common terminal. The DCS system generates a fault alarm signal, and a normally open node of a loop fault monitoring relay 30X is connected with the DCS fault alarm signal; the normally closed node of intermediate relay K6 is connected in parallel with the normally open node of loop fault monitor relay 30X. When the soft start loop is abnormal, the control and power supply is abnormal or the state of the control loop transfer switch is abnormal, the DCS triggers an abnormal alarm. In further detail, the remote control signal is electrically connected with a positive public end of the power supply; the other end of the intermediate relay K6 is electrically connected to the negative common terminal of the power supply.

A group of normally closed intermediate relays K6 are additionally arranged in a local starting disc of a turbine direct-current oil pump, a REMOTE control signal (REMOTE signal) is connected with a POWER supply NORMAL signal (POWER NORMAL signal) in series, and after being inverted by a newly-added intermediate relay K6 normally closed node, the REMOTE control signal is merged into a FAULT alarm loop to be connected with a normally open node of a loop FAULT monitoring relay 30X in parallel, and when a control or POWER supply is abnormal or the position of an in-place change-over switch is abnormal, the FAULT alarm loop can be connected into an 'unavailable XB 5' loop of a DCS system to trigger the 'electrical FAULT' alarm of the DCS system. The problem of original control panel control and power supply are unusual after the switching-in DCS system, DCS system can't trigger unusual warning when control circuit change-over switch state is unusual is solved to through optimizing the DCS system "electric fault" warning when perfect accident direct current oil pump start-up circuit is unusual, be favorable to producers in time to discover and handle, can improve the fail safe nature of direct current oil pump start-up circuit, avoid under the accident circumstances because of direct current oil pump can't jointly start can cause main equipment broken shaft to burn or the hydrogen leakage accident of running out of hydrogen.

In the embodiment of the specification, the hard-hand-operated start-stop control loop of the direct-current oil pump start control system comprises a hard-hand-operated start button, a start relay K4, an emergency stop button, a start relay K5, a start relay KM1 and a start relay KM 2. Specifically, a normally open node of a hard hand operation start button is connected in series with a normally closed node of an emergency stop button and a start relay K4; the normally open node of the starting relay K4 is connected in parallel with the normally open node of the hard hand operation starting button; the normally open node of the starting relay K4 is connected with the normally closed node of the emergency stop button and the starting relay K5 in series, and the normally open node of the starting relay K4, the normally closed node of the emergency stop button and the starting relay K5 are connected with the normally open node of the hard hand operation starting button, the normally closed node of the emergency stop button and the starting relay K4 in parallel; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5 and the normally open node of the starting relay KM1 are connected in parallel with the normally open node of the hard hand-operated starting button, the normally closed node of the emergency stop button and the starting relay K4; the starting relay KM2 is connected in parallel with the starting relay KM 1. In further detail, one end of the hard hand operation starting button is electrically connected with a positive electricity common end of the power supply; the normally-open node of the starting relay K4 and the normally-open node of the starting relay K5 are electrically connected with the positive common end of the power supply respectively; the starting relay K4, the starting relay K5, the starting relay KM1 and the starting relay KM2 are electrically connected with a negative electricity common terminal of a power supply respectively.

When the hard-hand operation is started, the ON-site starting disc emergency stop button is confirmed to be in a screwing-out state, no matter what position the ON-site starting disc ON-site selector switch of the steam turbine direct-current oil pump is in 'REMOTE/OFF/ON', the direct-current oil pump is directly started as long as the operator panel station accident starting button is pressed. Thus, a hard-wired loop control is constructed, which is the most effective starting method in case of an accident. When the starting mode of hard hand operation is adopted, after the corresponding gasoline engine lubricating oil system or sealing oil system is confirmed to be recovered to be normal, the emergency stop button can be directly screwed out to recover to be normal for standby.

In the embodiment of the specification, the local starting control loop of the direct-current oil pump starting control system comprises a local switch, an emergency stop button, a starting relay K5, a starting relay KM1 and a starting relay KM 2. Specifically, an ON node of the local transfer switch is connected in series with a normally closed node of an emergency stop button and a starting relay K5; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5 and the normally open node of the starting relay KM1 are connected in parallel with the ON node of the local selector switch, the normally closed node of the emergency stop button and the starting relay K5; the starting relay KM2 is connected in parallel with the starting relay KM 1. In further detail, the ON node of the local switch and the normally open node of the starting relay K5 are electrically connected with the positive common end of the power supply respectively; the starting relay K5, the starting relay KM1 and the starting relay KM2 are electrically connected with the negative electricity common end of the power supply respectively.

When the local starting mode is adopted, the ON-site starting disc scram button is confirmed to be in a screw-out state, and the ON-site starting disc ON-site switching switch of the turbine direct-flow oil pump is switched to be ON, so that the direct-flow oil pump can be started. At this point, the shutdown may be performed by activating an on-site diverter switch on the disk. After confirming that the corresponding gasoline engine lubricating oil system or sealing oil system is recovered to be normal, the local starting disc of the gasoline engine direct-current oil pump switches the local switch to OFF, so that the direct-current oil pump is stopped. After the operation is stopped, the emergency stop button is confirmed to be in a normal screwing-out state, the on-site change-over switch is switched back to the REMOTE state, and the direct-current oil pump can be restored to be normal for standby. This stopping is not effective for "hard-handed power-on".

In the embodiment of the specification, the DCS start control loop of the dc oil pump start control system includes a DCS start command normally open node, a local switch, a DCS stop relay K2, a DCS start relay K1, an emergency stop button, a start relay K5, a start relay KM1, and a start relay KM 2. Specifically, a DCS system starting instruction normally-open node is connected in series with a REMOTE node of the local transfer switch, a DCS stop relay K2 normally-closed node and a DCS starting relay K1; the DCS starting relay K1 normally-open node is connected in parallel with a DCS system starting instruction normally-open node; a normally open node of a DCS starting relay K1 is connected with a normally closed node of an emergency stop button and a starting relay K5 in series, and the normally open node of the DCS starting relay K1, the normally closed node of the emergency stop button, the normally open node of a starting relay K5 and a starting instruction of a DCS system, a REMOTE node of a local switch, the normally closed node of the DCS stop relay K2 and a DCS starting relay K1 are connected in parallel; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5, the normally open node of the starting relay KM1 and the DCS starting instruction normally open node, the REMOTE node of the local switch, the normally closed node of the DCS stopping relay K2 and the DCS starting relay K1 are connected in parallel; the starting relay KM2 is connected in parallel with the starting relay KM 1. In further detail, a DCS starting instruction normally-open node and a DCS starting relay K1 normally-open node are respectively and electrically connected with a positive electricity common end of a power supply, and a DCS starting relay K1, a starting relay K5, a starting relay KM1 and a starting relay KM2 are respectively and electrically connected with a negative electricity common end of the power supply.

In addition, a DCS stop control loop of the direct-current oil pump start control system comprises a DCS start instruction normally-open node, a DCS stop relay K2, a DCS start relay K1, an emergency stop button, a local selector switch, a start relay K5, a start relay KM1 and a start relay KM 2; . Specifically, a DCS stop instruction normally-open node is connected in series with a DCS stop relay K2; a normally open node of a DCS starting relay K1 is connected with an emergency stop button and a starting relay K5 in series, and the normally open node of the DCS starting relay K1, the emergency stop button and a starting relay K5 are connected with a normally open node of a DCS stop instruction and a DCS stop relay K2 in parallel; a normally open node of a DCS starting relay K1 is connected in series with a REMOTE node of an on-site transfer switch, a normally closed node of a DCS stopping relay K2 and a DCS starting relay K1, and the normally open node of the DCS starting relay K1, the REMOTE node of the on-site transfer switch, the normally closed node of the DCS stopping relay K2, the DCS starting relay K1 are connected in parallel with a DCS system stopping instruction normally open node and a DCS stopping relay K2; the normally open node of the starting relay K5 is connected in series with the starting relay KM1, and the normally open node of the starting relay K5, the normally open node of the starting relay KM1 are connected in parallel with the DCS stop instruction normally open node and the DCS stop relay K2; the starting relay KM2 is connected in parallel with the starting relay KM 1. In further detail, a DCS system starting instruction normally-open node and a DCS starting relay K1 normally-open node are respectively and electrically connected with a positive common end of a power supply; the DCS starting relay K1, the DCS stopping relay K2, the starting relay K5, the starting relay KM1 and the starting relay KM2 are electrically connected with a negative electricity common end of a power supply respectively.

When a REMOTE DCS starting mode is adopted, the REMOTE DCS starting condition needs to be met, namely the on-site starting disc scram button needs to be confirmed to be in a screwing-out state, and when a steam turbine accident happens, the on-site starting disc of the direct current oil pump is in a 'REMOTE' state. The method can be manually operated to start, and the start is clicked on the operation picture of the direct-flow oil pump of the DCS picture steam engine and confirmed, so that the direct-flow oil pump is started. And interlocking automatic start can be carried out, the direct-current oil pump of the DCS picture steam engine is put into interlocking, and the automatic start is controlled by DCS logic (CLOSE COMMAND). For example, when the direct-current lubricating oil pump of the steam engine is started, when two alternating-current lubricating oil pumps trip or any one alternating-current lubricating oil pump runs and the lubricating oil supply pressure is less than or equal to 0.07MPa, DCS logic (CLOSE COMMAND) controls the automatic starting of the direct-current lubricating oil pump. After the starting, the standby interlocking of the direct-current oil pump automatically exits. When the steam turbine accident direct-current oil pump is started by DCS manual operation or automatically started in an interlocking mode, the local change-over switch of the starting plate is confirmed to be at 'REMOTE', and after the corresponding steam turbine lubricating oil system or sealing oil system is confirmed to be recovered to be normal, the 'stop' is clicked on the operation picture of the steam turbine direct-current oil pump in the DCS picture and confirmed, and then the direct-current oil pump can be stopped. This approach is not effective for "hard-handed hard start" and "start-in-place".

The direct-current oil pump starting control system realizes mutual independence of three starting/stopping control modes of 'hard hand operation starting/stopping', 'DCS starting/stopping' and 'local starting/stopping' of the direct-current oil pump based on the control of the DCS system, so that the starting and the stopping are convenient, operators can remember operation requirements conveniently, and misoperation under the condition of accidents is prevented. For example, in case of an accident, the steam turbine direct-current oil pump interlock is automatically started, then the hard-hand-operated start button is pressed, after the system is recovered to be normal, firstly, the 'stop' is clicked on a DCS control picture and confirmed, a corresponding DCS start instruction is reset, then, the emergency stop button is pressed on the spot, and after the system is stopped, the emergency stop button is screwed out, and then the operation can be stopped.

In a specific embodiment, the direct current oil pump start control system further comprises an operation indicator lamp and a stop indicator lamp. The normally open node of the starting relay KM1 is connected in series with the operation indicator lamp. The normally closed node of the starting relay KM1 is connected in series with the stop indicator lamp, and the normally closed node of the starting relay KM1, the stop indicator lamp, the normally open node of the starting relay KM1 and the running indicator lamp are connected in parallel. In further detail, the normally open node of the starting relay KM1 and the normally closed node of the starting relay KM1 are respectively and electrically connected with the positive common end of the power supply; the operation indicator light and the stop indicator light are respectively and electrically connected with the negative electricity common end of the power supply. And the operation indicator light is used for reminding the operator that the operator is operating, and similarly, the stop indicator light is used for reminding the operator that the operator is stopped.

To sum up, this specification discloses a direct current oil pump start control system based on DCS system, can realize that the direct current oil pump based on DCS system control "hard hand is operated to start/stop", "DCS starts/stops", "start/stop on the spot" three start/stop control mode mutual independence, easy operation, easily memory, the operating personnel of being convenient for know and master the operation key, prevent to take place the maloperation under the accident situation. Meanwhile, the direct-current oil pump starting control system has a perfect DCS alarm function, and solves the problems that the original control panel is connected into the DCS system, the control and power supply are abnormal, and the DCS system cannot trigger abnormal alarm when the state of a control loop change-over switch is abnormal. And the 'electrical fault' alarm of the DCS is completed through optimization and transformation when the direct-current oil pump starting circuit is abnormal, so that production personnel can find and process the fault in time, the safety and reliability of the direct-current oil pump starting circuit can be improved, the accidents of main equipment broken shaft burning or hydrogen leakage caused by incapability of starting the direct-current oil pump in an accident situation are avoided, and the operation safety is greatly improved.

Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.

Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A direct-current oil pump starting control system based on a DCS (distributed control system) is characterized by comprising an on-site selector switch, a control power switch, an intermediate relay K6, a hard-hand-operated starting and stopping control loop, an on-site starting control loop, a DCS stopping control loop and an alarm loop; the hard hand operation start-stop control loop, the local start control loop, the DCS stop control loop and the alarm loop are electrically connected with a power supply through the control power switch respectively; the local switch sends a signal to the DCS system, and the DCS system generates a remote control signal; the control power switch sends a signal to a reservation system, and the reservation system generates a power normal signal; the remote control signal is connected with the normal signal of the power supply in series, and is inverted by a normally closed contact of an intermediate relay K6 and then is merged into the alarm loop.

2. The DCS system based DC oil pump start control system of claim 1, wherein the hard hand start-stop control loop comprises a hard hand start button, a start relay K4, an emergency stop button, a start relay K5, a start relay KM1, a start relay KM 2;

3. The DCS system based DC oil pump start control system of claim 1, wherein the local start control loop comprises a local switch, an emergency stop button, a start relay K5, a start relay KM1, a start relay KM 2;

4. The DCS-based direct current oil pump start control system of claim 1, wherein the DCS start control loop comprises a DCS start command normally open node, an on-site switch, a DCS stop relay K2, a DCS start relay K1, an emergency stop button, a start relay K5, a start relay KM1 and a start relay KM 2;

5. The DCS-based direct current oil pump start control system of claim 1, wherein the DCS stop control loop comprises a DCS start command normally open node, a DCS stop relay K2, a DCS start relay K1, an emergency stop button, a local switch, a start relay K5, a start relay KM1 and a start relay KM 2;

6. The DCS-based DC oil pump start control system of claim 1, further comprising a control power supply monitoring relay K3, a loop fault monitoring relay 30X, a start relay KM1, a soft start loop monitoring relay 48T, a soft start loop contactor KM 11-KM 16;

7. The DCS-based DC oil pump startup control system of claim 6, wherein one end of the intermediate relay K6 is electrically connected with the power supply normal signal, and the other end is electrically connected between the loop fault monitoring relay 30X and the control power supply monitoring relay K3.

8. The DCS-based DC oil pump start control system of claim 6, wherein the DCS generates a fault alarm signal, and the loop fault monitoring relay 30X normally open node is connected with the fault alarm signal; the normally closed node of the intermediate relay K6 is connected in parallel with the normally open node of the loop fault monitoring relay 30X.

9. The DCS-based dc oil pump start control system of claim 2, further comprising an operation indicator light; the normally open node of the starting relay KM1 is connected in series with the operation indicating lamp.

10. The DCS-based dc oil pump start control system of claim 9, further comprising a stop indicator light; the normally closed node of the starting relay KM1 is connected in series with the stop indicator lamp, and the normally closed node of the starting relay KM1, the stop indicator lamp, the normally open node of the starting relay KM1 and the running indicator lamp are connected in parallel.