CN117784583A - Multiple redundant control system of rotating partition plate - Google Patents

Abstract

The invention discloses a multiple redundancy control system of a rotary partition plate, which comprises a hydraulic control part and an electric control part, wherein: the hydraulic control part comprises three electrohydraulic servo valves, the three electrohydraulic servo valves are simultaneously connected with a rotary baffle plate for controlling the oil motor, a single electrohydraulic servo valve fails, an oil loop of the failed servo valve is cut off, and the hydraulic control part is switched into another two electrohydraulic servo valves to control the rotary baffle plate without disturbance; the electric control part comprises two gate regulating control VP cards which are respectively connected with and control three electrohydraulic servo valves, and under the condition that a single gate regulating control VP card fails, the other gate regulating control VP card command is outputted without disturbance. According to the invention, through the triple redundant liquid control valve, the opening degree of the rotary partition plate can be normally controlled even if two paths of electrohydraulic servo valves are in fault. The redundant rotary partition board is configured to control the VP card, and under the condition of failure of the main VP card, redundant instructions of the standby VP card are outputted undisturbed, so that the rotary partition board is free from disturbance, and the reliability of the electric control part is enhanced.

Description

Multiple redundant control system of rotating partition plate

Technical Field

The invention relates to the field of heat supply of turbine units, in particular to a multiple redundancy control system of a rotary partition board.

Background

Along with the improvement of the environmental protection requirement of the society, the heat supply source of the society is gradually replaced by 'small heat electricity' to 'large unit' for heat supply, and more power generation enterprises begin to utilize the characteristics of the units of the power generation enterprises to carry out heat supply reconstruction on the turbine units. The rotary partition board is used for steam extraction and heat supply, and the heat supply mode of extracting steam from a certain stage in the middle of the medium-pressure cylinder by utilizing the rotary throttling stationary blade has the advantages of larger adjustable range of heat supply and steam extraction parameters and flow under medium-high load and better heat supply economy.

And the hydraulic control part of the rotary partition board is controlled by a single group of electrohydraulic control servo valves in the conventional configuration, and once the servo valves have the faults of jamming and the like, the rotary partition board cannot adjust the pressure, so that the unit cannot meet external heat supply parameters, and the safe operation of the unit is affected.

And the rotating partition board electric control part performs PID operation according to the deviation between the set heating pressure and the actual pressure, and then outputs a rotating partition board instruction to drive the hydraulic servo valve by the valve control VP card to adjust the opening of the rotating partition board. The valve control VP card is a single clamping piece, and if the valve control VP card fails, the rotary partition board cannot be adjusted.

Disclosure of Invention

The invention aims at: the multiple redundancy control system for the rotary partition plate is provided, the safety and reliability of a mechanical part and an electric control part of the rotary partition plate are greatly improved, and stable heat supply of a unit is ensured.

The technical scheme of the invention is as follows:

the multiple redundant control system of rotatory baffle includes hydraulically controlled part, automatically controlled part, wherein:

the hydraulic control part comprises three electrohydraulic servo valves, the three electrohydraulic servo valves are simultaneously connected with a rotary baffle plate for controlling the oil motor, a single electrohydraulic servo valve fails, an oil loop of the failed servo valve is cut off, and the hydraulic control part is switched into another two electrohydraulic servo valves to control the rotary baffle plate without disturbance;

the electric control part comprises two gate regulating control VP cards, forms a control redundancy mode, is respectively connected with and controls three electrohydraulic servo valves, and outputs another gate regulating control VP card instruction without disturbance under the condition of single gate regulating control VP card failure, so that the normal operation of the rotary partition plate is ensured.

Preferably, the control system is used for heat supply control of a 316 MW-level unit turbine, when the load of the turbine is lower than 190MW, the system gives an alarm, judges whether the heat load is cut off according to actual conditions, and if the heat load is cut off, the rotary partition plate is slowly fully opened.

Preferably, if the operation of the heating working condition is required to be switched to the pure condensing working condition, the heating steam extraction electric valve is closed, the quick closing valve on the heating pipeline is closed, the steam extraction check valve is opened to be fully opened, and the unit is switched to the condensing working condition.

Preferably, if the normal shutdown is required under the heating working condition, the heating working condition is switched to the pure condensing working condition for operation, and then the shutdown operation is carried out according to the shutdown step of the pure condensing working condition.

Preferably, the unit throws heat load under the heat supply working condition, takes the front pressure of the rotary partition plate higher than 1.65Mpa as a judgment condition, and the rotary partition plate is fully opened, and simultaneously, the heat supply steam extraction check valve, the heat supply steam extraction quick closing valve and the heat supply three-pump assembly are rapidly closed.

Preferably, the unit is in the heat supply condition and gets rid of the electric load, regard safe oil to unload or two main valves have closed simultaneously as judgement condition, close heat supply steam extraction check valve and heat supply fast closing valve and heat supply three and take out always fast, after the rotatory baffle is full Guan Yan for 2 seconds simultaneously, confirm that steam extraction check valve or heat supply fast closing valve or heat supply three take out always and have closed closely, slowly open rotatory baffle to full opening.

Preferably, if OPC acts, the heat supply steam extraction check valve, the heat supply quick closing valve and the heat supply three-pump assembly are quickly closed, and the rotary partition board is quickly closed; the OPC action disappears and the rotating slow partition opens.

Preferably, the machine set is stopped by accident under the pure condensation working condition, the safety oil is discharged or two main valves are closed at the same time as judging conditions, the rotary partition plate is closed rapidly, and the machine set is opened slowly after 2 seconds.

Preferably, the unit is stopped in an accident under the heat supply working condition, the safety oil is discharged or two main valves are closed at the same time to serve as judging conditions, the heat supply steam extraction check valve, the heat supply quick closing valve and the heat supply three-way valve are closed quickly, and the rotary partition board is opened slowly to be fully opened after the rotary partition board is fully Guan Yan for 2 seconds, so that the steam extraction check valve, the heat supply quick closing valve or the heat supply three-way valve are confirmed to be closed tightly.

Preferably, the electrohydraulic control valve logic configuration includes:

and (3) fault judgment of the electrohydraulic control valve: feeding back dead points or feeding back isolation solenoid valves corresponding to the dead points with the deviation of more than 10% and no time delay, and manually operating the isolation solenoid valves during recovery; the valve cores of the three electrohydraulic control valves feed back all dead points, the three isolation solenoid valves all act, the opening degree of the rotary partition plate is kept unchanged, and the isolation solenoid valves need to be manually operated during recovery;

low oil pressure alarm of rotary baffle oil pump: 13Mpa, standby self-starting 12Mpa, two oil pumps simultaneously deactivated, keeping the instruction of the rotary baffle plate, and simultaneously acting to isolate the electromagnetic valve.

The invention has the advantages that:

through the technical scheme, the beneficial effects of the scheme of the invention are as follows:

1. through triple redundant liquid control valves, even if 2 paths of electrohydraulic servo valve faults occur, the opening degree of the rotary partition plate can be controlled normally as long as one path of the electrohydraulic servo valve is guaranteed to work normally, and the reliability of a liquid control loop of the rotary partition plate is greatly enhanced.

2. The triple redundancy design of the hydraulic control loop can replace the fault electrohydraulic servo valve on line, and is more beneficial to overhauling and eliminating defects.

3. And the VP card is controlled through the configured redundant rotary partition board, under the condition that the main VP card fails, the failed main card is automatically cut into a 'DISARGED not in-place' state, and redundant instructions of the standby VP card are outputted without disturbance, so that the rotary partition board is not disturbed, and the reliability of the electric control part is enhanced.

Drawings

The invention is further described below with reference to the accompanying drawings and examples:

FIG. 1 is a schematic diagram of a hydraulically controlled portion of a control system of the present invention;

FIG. 2 is a schematic diagram of an electronically controlled portion of the control system of the present invention;

FIG. 3 is a DCS control interface for a rotating barrier in an embodiment.

Description of the embodiments

The invention relates to a rotary partition plate multiple redundancy control system, which comprises a hydraulic control part and an electric control part.

As shown in fig. 1, the hydraulic control part includes three electrohydraulic servo valves (DDV valves), which are simultaneously connected to a rotating partition plate controlling the oil motor, a single electrohydraulic servo valve (DDV valve) fails, the servo valve oil circuit is rapidly cut off, and the hydraulic control part is switched to another two electrohydraulic servo valves (DDV valves) to control the rotating partition plate without disturbance. The normal regulation and use of the hydraulic control loop can be ensured as long as the normal operation of one electrohydraulic servo valve (DDV valve) is ensured.

As shown in FIG. 2, the electric control part comprises two gate-regulating control VP cards, which form a control redundancy mode, and are respectively connected with and used for controlling three electrohydraulic servo valves (DDV valves). Under the condition that the single gate regulating control VP card fails, the undisturbed switching outputs another gate regulating control VP card instruction, and the normal operation of the rotary partition plate is ensured.

In the embodiment, heat supply transformation is performed on a turbine of a certain unit (316 MW level), and the heat supply transformation of the rotary partition plate is a technical difficulty of the project. The rotary partition plate steam extraction technology has the advantages that after the unit operates, the opening degree of the built-in rotary partition plate of the steam turbine is adjusted, the external steam supply flow is adjusted, the requirements of heat users are met, parameters such as steam supply pressure and temperature are guaranteed, the equipment layout is simple, the flow loss is low, the temperature and pressure loss is low, the economical efficiency is good, and the like, and the rotary partition plate steam extraction technology is widely applied to steam extraction of small and medium-sized steam turbines in 50MW-80MW grades, and the working temperature and the working pressure of the design operation are low. Along with the development of economy and the shutdown of small thermal power, the rotary baffle steam extraction technology of the high-parameter 300 MW-level high-parameter unit becomes the development direction of the steam extraction technology.

FIG. 3 is a DCS control interface for the rotating barrier in this embodiment. The rotating partition plate logic control scheme comprises:

1.1 rotary partition input enable conditions (and):

the extraction pressure of the rotary partition plate is not exceeded: (1 Mpa < extraction pressure <1.55 Mpa);

the main steam flow is >70%.

1.2 rotating bulkhead exit conditions (or):

the DEH off-grid generator switch is disconnected;

the steam engine is tripped;

MFT action;

the extraction pressure of the rotary partition plate is higher than 1.65Mpa (three is taken two after single-point judgment);

any door of the rotary partition board steam extraction pipeline is closed for 2 seconds;

OPC acts;

quick closing condition of the rotary partition plate: safety oil is discharged or 2 main ports are closed at the same time.

1.3 rotating partition manual conditions (or):

rotating the baffle plate to extract the dead point under the steam pressure;

the extraction pressure of the rotary partition plate exceeds the limit;

the deviation between the set value of the extraction pressure of the rotary partition plate and the process value is more than 0.3Mpa;

the rotating partition exits the condition.

1.4 rotating partition plate action mode:

1.4.1 when the load is lower than 190MW, the system gives an alarm, judges whether to cut off the heat load according to the actual situation, and if the heat load is cut off, the rotary partition plate is slowly fully opened (running manual operation).

1.4.2 if the operation of the heating working condition is required to be switched to the pure condensing working condition, the heating steam extraction electric valve is closed, the quick closing valve on the heating pipeline is closed, the steam extraction check valve is opened to be fully opened, and the unit is switched to the condensing working condition (operation manual operation).

1.4.3 if the normal shutdown under the heating working condition is required, the heating working condition is switched into the pure condensing working condition to operate according to the requirement in 1.4.2, and then the shutdown operation is carried out according to the shutdown step of the pure condensing working condition.

1.4.4 sets get rid of the heat load under the heat supply operating mode, regard pressure before the rotatory baffle is higher than 1.65Mpa as the judgement condition, rotatory baffle is full to open, simultaneously quick closed heat supply steam extraction check valve and heat supply steam extraction quick closing valve (action time <1 s) and heat supply three take out always.

1.4.5 machine set gets rid of electric load under the heat supply operating mode, regard relief oil to unload or two main valves have closed simultaneously as judgement condition, quick closed heat supply steam extraction check valve and heat supply quick-closing valve (action time <1 s) and heat supply three take out always, after the rotatory baffle is closed entirely (action time is less than 0.5 s) delay 2 seconds simultaneously, confirm that the steam extraction check valve or heat supply quick-closing valve or heat supply three take out always have closed closely, slowly open rotatory baffle to full (action time about 20 seconds).

1.4.6, the heat supply steam extraction check valve, the heat supply quick closing valve (the action time is less than 1 s) and the heat supply three-pump assembly are quickly closed by OPC action, and the rotary partition board is quickly closed. The OPC action disappeared and the rotating barrier was slowly opened (action time about 20 seconds).

1.4.7, accident shutdown under the pure condensation working condition of the unit, safety oil discharge or simultaneous closing of two main valves are taken as judging conditions, the rotary partition plate is closed rapidly (the action time is less than 0.5 s), and the rotary partition plate is opened slowly and fully after 2 seconds of delay (the action time is about 20 seconds).

And (3) stopping the machine set at an accident under a heating working condition of 1.4.8, taking the condition that safety oil is discharged or two main valves are closed at the same time as a judging condition, rapidly closing a heating steam extraction check valve, a heating quick-closing valve (action time is less than 1 s) and a heating three-suction total, and after the rotary partition plate is fully closed (action time is less than 0.5 s) for 2 seconds, confirming that the rotary partition plate is slowly opened to be fully opened (action time is about 20 seconds) when the steam extraction check valve, the heating quick-closing valve or the heating three-suction total is tightly closed.

1.5 logic configuration of electrohydraulic control valve (DDV valve):

1.5.1DDV valve failure judgment: and feeding back dead points or feeding back isolation solenoid valves corresponding to the dead points with the deviation of more than 10% in pairs without time delay, and manually operating the isolation solenoid valves during recovery. All dead points are fed back by the three DDV valve cores, the three isolation solenoid valves all act, the opening degree of the rotary partition plate is kept unchanged, and the isolation solenoid valves need to be manually operated during recovery.

1.5.2 rotating baffle oil pump low oil pressure alarm: 13Mpa, standby self-starting 12Mpa, two oil pumps simultaneously deactivated, keeping the instruction of the rotary baffle plate, and simultaneously acting to isolate the electromagnetic valve.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and are not intended to limit the scope of the present invention. All modifications made according to the spirit of the main technical proposal of the invention should be covered in the protection scope of the invention.

Claims (10)

1. The multiple redundant control system of rotatory baffle, its characterized in that includes hydraulically controlled part, automatically controlled part, wherein:

the hydraulic control part comprises three electrohydraulic servo valves, the three electrohydraulic servo valves are simultaneously connected with a rotary baffle plate for controlling the oil motor, a single electrohydraulic servo valve fails, an oil loop of the failed servo valve is cut off, and the hydraulic control part is switched into another two electrohydraulic servo valves to control the rotary baffle plate without disturbance;

the electric control part comprises two gate regulating control VP cards, forms a control redundancy mode, is respectively connected with and controls three electrohydraulic servo valves, and outputs another gate regulating control VP card instruction without disturbance under the condition of single gate regulating control VP card failure, so that the normal operation of the rotary partition plate is ensured.

2. The rotating partition plate multiple redundancy control system according to claim 1, wherein the control system is used for heat supply control of a turbine of a 316 MW-level unit, when the load of the turbine is lower than 190MW, the system gives an alarm, judges whether to cut off the heat load according to actual conditions, and if the heat load is cut off, the rotating partition plate is slowly fully opened.

3. The rotating partition plate multiple redundancy control system according to claim 2, wherein if the operation of the heating condition is to be switched to the pure condensing condition, the heating steam extraction electric valve is closed, the quick-closing valve on the heating pipeline is closed, the steam extraction check valve is opened, the rotating partition plate is fully opened, and the unit is switched to the condensing condition.

4. The rotating separator multiple redundant control system of claim 3 wherein if a normal shutdown is required during a heating condition, the heating condition is shifted to a pure condensing condition for operation and then a shutdown step is performed in accordance with the pure condensing condition.

5. The multiple redundant control system of rotating partition plates according to claim 4, wherein the unit throws heat load under the heat supply condition, the rotating partition plates are fully opened under the judgment condition that the front pressure of the rotating partition plates is higher than 1.65Mpa, and simultaneously, the heat supply steam extraction check valve, the heat supply steam extraction quick closing valve and the heat supply three-pump assembly are rapidly closed.

6. The multiple redundant control system of a rotating partition plate according to claim 5, wherein the unit is subjected to power-off load under a heat supply condition, the heat supply steam extraction check valve, the heat supply quick-closing valve and the heat supply three-pump assembly are rapidly closed by taking safety oil discharge or simultaneous closing of two main steam valves as judgment conditions, and the rotating partition plate is slowly opened to be fully opened after the rotating partition plate is fully Guan Yan for 2 seconds, so that the heat supply three-pump assembly or the steam extraction check valve are confirmed to be tightly closed.

7. The rotating partition multiple redundant control system of claim 6, wherein if OPC is done, the heat supply steam extraction check valve and the heat supply quick shut valve and the heat supply three-pump are quickly closed, the rotating partition is quickly shut; the OPC action disappears and the rotating slow partition opens.

8. The rotating partition multiple redundant control system according to claim 7, wherein an accident shutdown, a safe oil discharge or simultaneous closing of two main valves under a set pure condensation condition is taken as a judgment condition, the rotating partition is closed rapidly, and the rotating partition is opened slowly after a delay of 2 seconds.

9. The multiple redundant control system of a rotating partition plate according to claim 8, wherein the emergency stop of the unit under the heat supply working condition takes the safety oil discharge or the simultaneous closing of two main valves as a judgment condition, the heat supply steam extraction check valve, the heat supply quick-closing valve and the heat supply three-pump assembly are rapidly closed, and the rotating partition plate is slowly opened to be fully opened after the rotating partition plate is fully Guan Yan for 2 seconds, so that the steam extraction check valve, the heat supply quick-closing valve or the heat supply three-pump assembly is confirmed to be tightly closed.

10. The rotating diaphragm multiple redundancy control system of claim 9, wherein said electro-hydraulic control valve logic configuration comprises:

and (3) fault judgment of the electrohydraulic control valve: feeding back dead points or feeding back isolation solenoid valves corresponding to the dead points with the deviation of more than 10% and no time delay, and manually operating the isolation solenoid valves during recovery; the valve cores of the three electrohydraulic control valves feed back all dead points, the three isolation solenoid valves all act, the opening degree of the rotary partition plate is kept unchanged, and the isolation solenoid valves need to be manually operated during recovery;

low oil pressure alarm of rotary baffle oil pump: 13Mpa, standby self-starting 12Mpa, two oil pumps simultaneously deactivated, keeping the instruction of the rotary baffle plate, and simultaneously acting to isolate the electromagnetic valve.