阅读说明：本技术 基于汽轮机运行的保护系统及保护方法 (Protection system and protection method based on operation of steam turbine ) 是由 包锦华 李刚 于 2020-12-24 设计创作，主要内容包括：本发明提供一种基于汽轮机运行的保护系统及保护方法,所述基于汽轮机运行的保护系统包括：第一速度检测模块,与汽轮机连接,用于获取汽轮机的第一转速信号；第二速度检测模块,与所述汽轮机连接,用于获取汽轮机的第二转速信号；遮断信号检测模块,用于获取遮断信号,所述遮断信号针对所述汽轮机运行过程中出现的异常情况生成；控制模块,用于根据所述第一转速信号、所述第二转速信号和所述遮断信号中的至少一种信号对所述汽轮机的阀门进行控制。本发明可以针对汽轮机的超速采取最快速、最直接的保护措施,且通过冗余检测提高了汽轮机保护系统的可靠性。(The invention provides a protection system and a protection method based on the operation of a steam turbine, wherein the protection system based on the operation of the steam turbine comprises the following steps: the first speed detection module is connected with the steam turbine and used for acquiring a first rotating speed signal of the steam turbine; the second speed detection module is connected with the steam turbine and used for acquiring a second rotating speed signal of the steam turbine; the system comprises an interruption signal detection module, a data processing module and a data processing module, wherein the interruption signal detection module is used for acquiring an interruption signal which is generated aiming at an abnormal condition occurring in the operation process of the steam turbine; and the control module is used for controlling a valve of the steam turbine according to at least one signal of the first rotating speed signal, the second rotating speed signal and the cutoff signal. The invention can take the fastest and most direct protection measures aiming at the overspeed of the steam turbine, and improves the reliability of the steam turbine protection system through redundant detection.)

1. A protection system based on the operation of a steam turbine, the protection system based on the operation of the steam turbine comprising:

the first speed detection module is connected with the steam turbine and used for acquiring a first rotating speed signal of the steam turbine;

the second speed detection module is connected with the steam turbine and used for acquiring a second rotating speed signal of the steam turbine;

the system comprises an interruption signal detection module, a data processing module and a data processing module, wherein the interruption signal detection module is used for acquiring an interruption signal which is generated aiming at an abnormal condition occurring in the operation process of the steam turbine;

and the control module is respectively connected with the first speed detection module, the second speed detection module and the interception signal detection module and is used for controlling a valve of the steam turbine according to at least one of the first rotating speed signal, the second rotating speed signal and the interception signal.

2. The turbine operation-based protection system of claim 1, wherein the first speed detection module and the second speed detection module are redundant modules;

the first speed detection module comprises a first speed sensor, a second speed sensor and a third speed sensor;

the first speed sensor is used for collecting the rotating speed of the steam turbine to obtain a first rotating speed;

the second speed sensor is used for collecting the rotating speed of the steam turbine to obtain a second rotating speed;

and the third speed sensor is used for collecting the rotating speed of the steam turbine and acquiring a third rotating speed.

3. The turbine operation based protection system of claim 2, wherein:

the first rotating speed, the second rotating speed and the third rotating speed are mutually redundant signals, and the first rotating speed signal is determined according to at least two of the first rotating speed, the second rotating speed and the third rotating speed.

4. The turbine operation based protection system of claim 1, wherein:

the valve of the steam turbine comprises at least: the high-pressure main valve, the high-pressure regulating valve, the reheating main valve, the reheating regulating valve, the steam supplementing valve, the reheating check valve and the high-exhaust ventilation valve.

5. The turbine operation based protection system of claim 1, wherein:

the control module comprises a first overspeed protection unit, a second overspeed protection unit and a control protection unit;

the first overspeed protection unit, the second overspeed protection unit and the control protection unit are connected in series.

6. The turbine operation based protection system of claim 5, wherein:

the first overspeed protection unit is used for performing on-off operation on a loop of the steam turbine according to the first rotating speed signal;

the second overspeed protection unit is used for performing on-off operation on a loop of the steam turbine according to the second rotating speed signal;

and the control protection unit is used for executing on-off operation on a loop of the steam turbine according to the abnormal detection signal when the steam turbine operates.

7. The turbine operation based protection system of claim 1, wherein:

and aiming at the valve of the steam turbine, the valve closing signal generated by the control module is a redundant signal, and the valve is closed when the two redundant signals act simultaneously.

8. The turbine operation based protection system of claim 7, wherein:

and feeding back the state signal when the valve is closed to the control module to judge whether the equipment connected with the valve is normal.

9. A method of protection based on the operation of a steam turbine, the method comprising:

acquiring a first rotating speed signal of a steam turbine and a second rotating speed signal of the steam turbine; the first rotating speed signal and the second rotating speed signal are redundant signals;

acquiring an interruption signal, wherein the interruption signal is generated aiming at an abnormal condition occurring in the operation process of the steam turbine;

controlling a valve of the steam turbine based on at least one of the first speed signal, the second speed signal, and the trip signal.

Technical Field

The invention belongs to the technical field of steam turbine control, relates to a protection method, and particularly relates to a protection system and a protection method based on steam turbine operation.

Background

In the prior art, a turbine protection system consists of a monitoring protection device and a hydraulic system. When the monitoring and protecting device of the turbine is operated, such as overspeed, low vacuum, axial displacement, low lubricating oil pressure and the like, the electromagnetic valve is operated, high-pressure power oil is quickly leaked to quickly close the automatic main throttle valve and the adjusting throttle valve, the operation of the turbine is emergently stopped, and the purpose of protecting the turbine is achieved. When the steam turbine unit operates and important parameters influencing the safety of the unit exceed the operation limit of the steam turbine unit, the protection system closes all steam inlet valves of the steam turbine to make the unit stop emergently so as to ensure the safety of the unit. However, the reliability of the detection of the existing turbine protection system is yet to be further improved.

Therefore, how to provide a protection system and a protection method based on the operation of a steam turbine to solve the defects that the reliability of the protection system of the steam turbine cannot be further improved in the prior art and the like becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a protection system and a protection method based on the operation of a steam turbine, which are used to solve the problem that the reliability of the protection system of the steam turbine cannot be further improved in the prior art.

To achieve the above and other related objects, according to one aspect of the present invention, there is provided a protection system for operation of a steam turbine, including: the first speed detection module is connected with the steam turbine and used for acquiring a first rotating speed signal of the steam turbine; the second speed detection module is connected with the steam turbine and used for acquiring a second rotating speed signal of the steam turbine; the system comprises an interruption signal detection module, a data processing module and a data processing module, wherein the interruption signal detection module is used for acquiring an interruption signal which is generated aiming at an abnormal condition occurring in the operation process of the steam turbine; and the control module is respectively connected with the first speed detection module, the second speed detection module and the interception signal detection module and is used for controlling a valve of the steam turbine according to at least one of the first rotating speed signal, the second rotating speed signal and the interception signal.

In an embodiment of the present invention, the first speed detection module and the second speed detection module are redundant modules; the first speed detection module comprises a first speed sensor, a second speed sensor and a third speed sensor; the first speed sensor is used for collecting the rotating speed of the steam turbine to obtain a first rotating speed; the second speed sensor is used for collecting the rotating speed of the steam turbine to obtain a second rotating speed; and the third speed sensor is used for collecting the rotating speed of the steam turbine and acquiring a third rotating speed.

In an embodiment of the invention, the first rotational speed, the second rotational speed, and the third rotational speed are redundant signals, and the first rotational speed signal is determined according to at least two of the first rotational speed, the second rotational speed, and the third rotational speed.

In an embodiment of the present invention, the valve of the steam turbine comprises at least: the high-pressure main valve, the high-pressure regulating valve, the reheating main valve, the reheating regulating valve, the steam supplementing valve, the reheating check valve and the high-exhaust ventilation valve.

In an embodiment of the invention, the control module is configured to turn off at least one of a high-pressure main valve, a high-pressure throttle, a reheat main valve, a reheat throttle, a steam supplement valve, a reheat check valve, and a high-exhaust ventilation valve of the steam turbine according to at least one of the first rotational speed signal, the second rotational speed signal, and the blocking signal.

In an embodiment of the present invention, the control module includes a first overspeed protection unit, a second overspeed protection unit and a control protection unit; the first overspeed protection unit, the second overspeed protection unit and the control protection unit are connected in series.

In an embodiment of the present invention, the first overspeed protection unit is configured to perform an on-off operation on the circuit of the steam turbine according to the first rotation speed signal; the second overspeed protection unit is used for performing on-off operation on a loop of the steam turbine according to the second rotating speed signal; and the control protection unit is used for executing on-off operation on a loop of the steam turbine according to the abnormal detection signal when the steam turbine operates.

In an embodiment of the present invention, for the valve of the steam turbine, the valve closing signal generated by the control module is a redundant signal, and the valve is closed when two of the redundant signals act simultaneously.

In an embodiment of the present invention, a state signal when the valve is closed is fed back to the control module to determine whether the device connected to the valve is normal.

In another aspect, the present invention provides a protection method based on the operation of a steam turbine, including: acquiring a first rotating speed signal of a steam turbine and a second rotating speed signal of the steam turbine; the first rotating speed signal and the second rotating speed signal are redundant signals; acquiring an interruption signal, wherein the interruption signal is generated aiming at an abnormal condition occurring in the operation process of the steam turbine; controlling a valve of the steam turbine based on at least one of the first speed signal, the second speed signal, and the trip signal.

In an embodiment of the present invention, the rotational speed of the steam turbine is collected to obtain a first rotational speed, a second rotational speed, and a third rotational speed; the first rotating speed, the second rotating speed and the third rotating speed are mutually redundant signals, and the first rotating speed signal is determined according to at least two of the first rotating speed, the second rotating speed and the third rotating speed.

In one embodiment of the present invention, the step of controlling a valve of the steam turbine according to at least one of the first rotational speed signal, the second rotational speed signal, and the cutoff signal includes: and according to at least one signal of the first rotating speed signal, the second rotating speed signal and the interruption signal, at least one of a high-pressure main valve, a high-pressure regulating valve, a reheating main valve, a reheating regulating valve, an air supplementing valve, a reheating check valve and a high-exhaust ventilation valve of the steam turbine is closed.

As described above, the protection system and the protection method based on the operation of the steam turbine according to the present invention have the following beneficial effects:

the invention improves the reliability of the turbine protection system through redundant overspeed detection, so that when one of the first speed detection module and the second speed detection module fails, the other one can keep normal detection function. The user can carry out the most direct and rapid control and protection on the whole steam turbine loop through the interruption button so as to reduce the influence of faults on the steam turbine loop to the minimum. The control protection unit is used for detecting and controlling various abnormal conditions such as overspeed, low vacuum, axial displacement, low lubricating oil pressure and the like of the steam turbine loop, and is provided with redundant output instructions, and the control relay is operated when at least two paths of output instructions are controlled simultaneously, so that the misoperation of the control relay is avoided. And meanwhile, as an option, a state signal for closing the electromagnetic valve is sent to the control module to judge whether the state is normal.

Drawings

FIG. 1 is a schematic block diagram of a protection system for a steam turbine according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a protection system for a steam turbine based operation according to an embodiment of the present invention.

FIG. 3 is a control schematic diagram of the protection system based on the operation of the steam turbine according to an embodiment of the present invention.

FIG. 4 is a control circuit diagram of the protection system based on the operation of the steam turbine according to an embodiment of the present invention.

FIG. 5 is a schematic flow chart diagram illustrating a method for turbine based operation protection in accordance with one embodiment of the present invention.

Description of the element reference numerals

Protection system based on steam turbine operation

11 first speed detection module

12 second speed detection module

13 interdiction signal detection module

14 control module

141 first overspeed protection unit

142 second overspeed protection unit

143 control protection unit

S51-S53

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

As overspeed protection is important protection of the steam turbine set, the steam turbine set is equipment rotating at high speed, once the set is out of control, an overspeed accident occurs, the equipment is damaged slightly to influence normal production, and the whole set is scrapped even casualties occur to cause heavy loss. Therefore, the overspeed protection is designed to be fault-safe, the control contact is in a closed state during normal work, and if overspeed occurs or equipment is powered off, the control contact is disconnected at the first time, so that the quick response of the turbine protection is realized. The protection system and the protection method based on the operation of the steam turbine can take the fastest and most direct protection measures aiming at the overspeed of the steam turbine, and the reliability of the protection system of the steam turbine is improved through redundancy detection and redundancy control in various forms.

The principle and implementation of the protection system and protection method based on turbine operation according to the present embodiment will be described in detail below with reference to fig. 1 to 5, so that those skilled in the art can understand the protection system and protection method based on turbine operation according to the present embodiment without creative work.

Referring to FIG. 1, a schematic diagram of a protection system for a steam turbine according to an embodiment of the present invention is shown. As shown in fig. 1, the protection system 1 based on the operation of the steam turbine includes: the device comprises a first speed detection module 11, a second speed detection module 12, a blocking signal detection module 13 and a control module 14.

The first speed detection module 11 is connected to the steam turbine and configured to obtain a first rotational speed signal of the steam turbine.

The second speed detection module 12 is connected to the steam turbine and configured to obtain a second rotational speed signal of the steam turbine.

The blocking signal detection module 13 is configured to obtain a blocking signal, where the blocking signal is generated according to an abnormal condition occurring in the operation process of the steam turbine.

The control module 14 is connected to the first speed detection module, the second speed detection module, and the blocking signal detection module, respectively, and is configured to control a valve of the steam turbine according to at least one of the first rotational speed signal, the second rotational speed signal, and the blocking signal.

Referring to FIG. 2, a schematic diagram of a protection system for a steam turbine according to an embodiment of the present invention is shown. As shown in fig. 2, in practical applications, the protection system based on the operation of the steam turbine mainly comprises a controller, an overspeed protection device, a steam turbine trip button, a control loop, a closing solenoid valve, and the like. The first speed detection module is an overspeed protection device 1, and the second speed detection module is an overspeed protection device 2.

In an embodiment, the first speed detection module and the second speed detection module are redundant modules. When one of the first speed detection module and the second speed detection module has a fault, the other one can maintain normal operation so as to ensure the reliability and stability of the overspeed protection function.

The first speed detection module comprises a first speed sensor, a second speed sensor and a third speed sensor. Specifically, the speed sensor 1, the speed sensor 2, and the speed sensor 3 constitute the overspeed protection apparatus 1.

The first speed sensor is used for collecting the rotating speed of the steam turbine and acquiring a first rotating speed.

And the second speed sensor is used for collecting the rotating speed of the steam turbine and acquiring a second rotating speed.

And the third speed sensor is used for collecting the rotating speed of the steam turbine and acquiring a third rotating speed.

Specifically, the speed sensor 1 acquires a first rotational speed, the speed sensor 2 acquires a second rotational speed, and the speed sensor 3 acquires a third rotational speed.

In an embodiment, the first rotational speed, the second rotational speed, and the third rotational speed are redundant signals, and the first rotational speed signal is determined according to at least two of the first rotational speed, the second rotational speed, and the third rotational speed.

Specifically, the first rotating speed is 3500r/min, the second rotating speed is 3500r/min, the third rotating speed is 3000r/min, and a rotating speed threshold value is 3300r/min, so that by using the rule of taking two out of three, if two rotating speeds exceed the rotating speed threshold value, it is determined that the speed is excessive, and protective measures need to be taken in a control loop.

In one embodiment, the valve of the steam turbine comprises at least: the high-pressure main valve, the high-pressure regulating valve, the reheating main valve, the reheating regulating valve, the steam supplementing valve, the reheating check valve and the high-exhaust ventilation valve. In practical application, the type and the number of each valve are configured according to the actual needs of the unit.

In one embodiment, the control module is configured to shut off at least one of a high-pressure main valve, a high-pressure throttle valve, a reheat main valve, a reheat throttle valve, an air supplement valve, a reheat check valve, and a high-exhaust ventilation valve of the steam turbine according to at least one of the first rotational speed signal, the second rotational speed signal, and the blocking signal.

Specifically, the controller in the control module judges the first rotating speed signal, the second rotating speed signal and the interruption signal, and when at least one of the first rotating speed signal and the second rotating speed signal exceeds a rotating speed threshold, overspeed protection is started, and corresponding contacts in a control circuit of the steam turbine are disconnected.

Further, the detection of the trip signal can be implemented in different ways, in one embodiment, when a user presses a trip button or an emergency stop button, a signal is transmitted to the controller for detection, and then the controller performs the related operation of the trip contact in the control loop of the steam turbine. In another embodiment, the interruption button or the emergency stop button is directly connected in series to a control loop of the steam turbine, and when a user presses the interruption button or the emergency stop button, the interruption button directly disconnects the loop where the interruption button is located, so that a protection action sent by the user in an emergency situation can be responded at the highest speed.

As shown in fig. 2, the turbine protection system controller receives the detection signal of the turbine, performs logical judgment processing, and finally outputs an operation signal for controlling the electromagnetic valve. The detection signals comprise rotating speed signals detected by the speed sensors 1-6 and blocking signals sent by steam turbine blocking buttons of the channel 1 and the channel 2. And generating a shutdown protection signal based on the rotating speed signal and the interruption signal, and transmitting the shutdown protection signal into a processor of the controller through an I/O channel for analysis and judgment. In practical applications, the overspeed judgment and the shutdown protection signal in emergency may be processed by the same processor, or may be processed by two different processors, i.e., the processor 1 and the processor 2. In different embodiments, the executing device for performing the comparison determination with the preset rotation speed threshold may be a first speed detection module and a second speed detection module, and the first speed detection module and the second speed detection module may include a controller chip capable of performing the comparison determination or a comparison circuit having a comparison function. The execution device can also be a controller in the control module, and after receiving the rotating speed signals of the first speed detection module and the second speed detection module, the execution device compares the rotating speed signals with a preset rotating speed threshold value to judge so as to generate a protection signal.

In one embodiment, the overspeed protection device receives a speed signal from the steam turbine set and sends a shutdown protection signal when the speed exceeds a limit. The overspeed protection device receives 3 paths of rotation speed signals, carries out three-out-of-two logic judgment in the overspeed protection device, sends out shutdown protection signals to the controller when more than two signals are out of limit or in fault, and the controller outputs contact action according to the received shutdown protection signals to cut off the power supply of the electromagnetic valve so as to rapidly close the electromagnetic valve. One set, two sets or even more than two sets of overspeed protection devices can be configured according to the actual requirements of the steam turbine set.

The steam turbine interdiction button is an emergency stop button, and is an emergency stop instruction operated by an operator, and when the operator of the unit judges that the unit needs to be stopped emergently, the operator manually operates the stop button to send a stop protection signal.

And a control loop of the steam turbine receives a stop protection signal generated by an overspeed protection device, a protection device in a controller loop and an emergency stop button, and controls an electromagnetic valve on the servomotor to be closed through a relay loop.

Specifically, an action instruction of the control circuit for the corresponding contact is received, the closing electromagnetic valve of the valve loses power, when the protection action needs to be stopped, the corresponding contact is disconnected, the circuit is disconnected, the electromagnetic valve is closed to lose power, the servomotor is rapidly closed through the oil way, and therefore steam inlet of the steam turbine is cut off, and the unit is stopped. The valves related to the protection of the steam turbine comprise a high-pressure main valve, a high-pressure regulating valve, a medium-pressure main valve, a medium-pressure regulating valve, a reheating main valve, a reheating regulating valve, a steam supplementing valve, a cold reheating check valve, a high-exhaust ventilation valve and the like, wherein each valve is provided with two closing electromagnetic valves, any one electromagnetic valve acts, and the oil-operated machine closes the valve. Therefore, from the aspect of fault safety, the electromagnetic valve is electrified and excited when the unit normally works so as to ensure that the unit can be safely shut down after the power supply is lost.

Referring to FIG. 3, a control diagram of a protection system based on turbine operation according to an embodiment of the present invention is shown. As shown in fig. 3, the control module 14 comprises a first overspeed protection unit 141, a second overspeed protection unit 142 and a control protection unit 143.

The first overspeed protection unit 141, the second overspeed protection unit 142 and the control protection unit 143 are connected in series.

In an embodiment, the first overspeed protection unit 141 is configured to perform an on-off operation on the circuit of the steam turbine according to the first speed signal. Specifically, the first speed detection module is configured to perform overspeed judgment on the acquired first rotational speed signal, and send a shutdown protection signal to the first overspeed protection unit when at least two rotational speeds of the first rotational speed, the second rotational speed, and the third rotational speed exceed a preset rotational speed threshold. The first rotating speed, the second rotating speed and the third rotating speed are all first rotating speed signals.

The second overspeed protection unit 142 is configured to perform an on-off operation on the loop of the steam turbine according to the second rotation speed signal. The signal processing and transmission of the second speed detection module and the second overspeed protection unit are the same as those of the first speed detection module and the first overspeed protection unit.

The control protection unit 143 is configured to perform an on-off operation on a loop of the steam turbine according to an abnormal detection signal when the steam turbine operates. Specifically, the control protection unit is arranged in a control loop of the steam turbine, and is used for executing the opening operation on the electromagnetic valve according to various detected abnormal detection signals of overspeed, low vacuum, axial displacement, low lubricating oil pressure and the like of the steam turbine.

Referring to fig. 4, a control circuit diagram of a protection system based on turbine operation according to an embodiment of the present invention is shown. As shown in fig. 4, the control and protection principle of the main valve and the regulating valve in the steam turbine system is shown, and the control of other valves is completed through different contacts of the intermediate relay, and the control principle is the same.

As shown in FIG. 4, the valves are powered by 24VDC, each valve is provided with two fast-closing valves, and each valve works at a current of about 1A. Furthermore, the total current capacity does not exceed the allowable capacity of the contact of the overspeed protection device, and an intermediate relay is not required to be expanded; the total current capacity exceeds the contact tolerance of the overspeed protection device and needs to be expanded by the intermediate relay.

The No. 1 interruption button, the No. 1 overspeed protection contact 1 and the No. 2 overspeed protection contact 1 are arranged in the channel 1 shown in the figure 2, and the No. 2 interruption button, the No. 1 overspeed protection contact 2 and the No. 2 overspeed protection contact 2 are arranged in the channel 2 shown in the figure 2. The contacts of the overspeed protection output, i.e. the overspeed protection contacts and the interruption button contacts, control 4 intermediate relays (K1-K4) which control the power supply of the solenoid valve. The K1-K4 relays are divided into two groups and controlled by two output contacts of two overspeed protection devices. The overspeed protection contact 1 is controlled by a first overspeed protection unit and the overspeed protection contact 2 is controlled by a second overspeed protection unit. The first overspeed protection unit and the second overspeed protection unit can realize the on-off of the contacts through the on-off of the relay.

Specifically, #1 overspeed protection device contact 1, #2 overspeed protection device contact 1, and the interrupter button 1# contact are connected in series, controlling the intermediate relays K1, K2.

And #1 overspeed protection device contact 2, #2 overspeed protection device contact 2 and the interruption button 2# contact are connected in series to control the intermediate relays K3 and K4.

The intermediate solenoid valves K1 to K4 are multi-contact relays, have 5 pairs of normally open contacts (23, 24), (33, 34), (43, 44), (53, 54), (63, 64), and control different solenoid valves by grouping.

In order to provide the reliability of the system, the intermediate relay adopts a safety relay, each pair of contacts is provided with two channels, and the safety relay can normally work only when signals of the two channels are normal; in the working process, the safety relay stops outputting as long as any channel signal is disconnected. In another embodiment, the intermediate relay may also be a general relay, and the invention is not limited thereto.

The intermediate relay contact is connected in series with the overspeed protection contact to control the power supply of the electromagnetic valve. When the device normally operates, the overspeed protection contact and the interruption button contact are both closed, the intermediate relay coil is electrified, and the contacts are closed. The protection system has no action instruction, and the normally open contact is closed. The electromagnetic valve is electrified, and the valve is opened to be in a normal working position.

In an embodiment of the present invention, for the valve of the steam turbine, the valve closing signal generated by the control module is a redundant signal, and the valve is closed when two of the redundant signals act simultaneously. In order to further ensure the reliability of the system, the control protection unit also adopts a redundant configuration. As shown in fig. 4, the output command for controlling the relay coil adopts dual-channel control, and is controlled by two action commands of two different output modules of the controller at the same time, namely when the output command #1 and the output command #2 act at the same time, the coil of the controlled relay loses power. Therefore, the interference signal caused by only one output command can be ignored, and the misoperation can be avoided to the maximum extent. In addition, the contacts of the relay also adopt double channels and are respectively controlled by two different intermediate relays. Therefore, when a fault or poor line contact occurs on the redundant branch, the other redundant branch can work normally.

In an embodiment of the present invention, a state signal when the valve is closed is fed back to the control module to determine whether the device connected to the valve is normal. In practical application, two ends of the solenoid valve SV are connected with a relay in parallel, and contacts of the relay are transmitted to the protection controller to monitor the electrified state of the solenoid valve SV, and an alarm can be sent if a relay fault, wiring looseness and the like occur, so that the solenoid valve state feedback of different valves is realized.

The number of the speed detection module, the speed sensor, the shutoff button, the relay, and the solenoid valve is not limited in the present invention. For example, the number of the speed detection modules can be a plurality of implementation redundancies other than two in the above embodiments, the number of the speed sensors can be a plurality of implementation redundancies other than three in the above embodiments, the number of the relays and the solenoid valves can be a number other than the number of the relays and the solenoid valves in fig. 4, and the number of all the components can be changed without departing from the technical principle of the present invention, and the protection scope of the present invention is within the protection scope of the present invention. The controller described in the present invention is an electronic device that contains a processor and memory and can be used to control a steam turbine system.

Referring now to FIG. 5, a schematic flow chart of a method for turbine based operation protection in accordance with one embodiment of the present invention is shown. As shown in fig. 5, the protection method based on the operation of the steam turbine specifically includes the following steps:

s51, acquiring a first rotating speed signal of the steam turbine and a second rotating speed signal of the steam turbine; the first rotating speed signal and the second rotating speed signal are redundant signals.

In one embodiment, the rotational speed of the steam turbine is collected to obtain a first rotational speed, a second rotational speed, and a third rotational speed.

The first rotating speed, the second rotating speed and the third rotating speed are mutually redundant signals, and the first rotating speed signal is determined according to at least two of the first rotating speed, the second rotating speed and the third rotating speed.

Specifically, when at least two of the first rotation speed, the second rotation speed and the third rotation speed exceed a preset rotation speed threshold, it is determined that the rotation speed is excessive, and a contact operation is required, so that the electromagnetic valve is closed and is de-energized.

And S52, acquiring a blocking signal, wherein the blocking signal is generated aiming at the abnormal condition occurring in the operation process of the steam turbine.

In particular, the detection of the interruption signal can be implemented in different ways, in one embodiment, when a user presses an interruption button or an emergency stop button, a signal is transmitted to the controller to be detected, and then the controller performs the relevant operation of the interruption contact in the control loop of the steam turbine. In another embodiment, the interruption button or the emergency stop button is directly connected in series to a control loop of the steam turbine, and when a user presses the interruption button or the emergency stop button, the interruption button directly disconnects the loop where the interruption button is located, so that a protection action sent by the user in an emergency situation can be responded at the highest speed.

S53, controlling the valve of the steam turbine according to at least one signal of the first rotating speed signal, the second rotating speed signal and the cutoff signal.

In one embodiment, S53 includes: and according to at least one signal of the first rotating speed signal, the second rotating speed signal and the interruption signal, at least one of a high-pressure main valve, a high-pressure regulating valve, a reheating main valve, a reheating regulating valve, an air supplementing valve, a reheating check valve and a high-exhaust ventilation valve of the steam turbine is closed.

The protection system based on the operation of the steam turbine can realize the protection method based on the operation of the steam turbine, the functional principle of the protection system based on the operation of the steam turbine corresponds to the protection method based on the operation of the steam turbine one by one, but the realization device of the protection method based on the operation of the steam turbine comprises but is not limited to the structure of the protection system based on the operation of the steam turbine listed in the embodiment, and all structural modifications and replacements in the prior art, which are made according to the principle of the invention, are included in the protection scope of the invention.

The protection scope of the protection method based on the operation of the steam turbine according to the present invention is not limited to the execution sequence of the steps listed in the embodiment, and all the schemes of adding, subtracting and replacing the steps in the prior art according to the principle of the present invention are included in the protection scope of the present invention.

In summary, the protection system and the protection method based on the operation of the steam turbine according to the present invention improve the reliability of the protection system of the steam turbine through the redundant overspeed detection, so that when one of the first speed detection module and the second speed detection module fails, the other one of the first speed detection module and the second speed detection module can maintain a normal detection function. The user can carry out the most direct and rapid control and protection on the whole steam turbine loop through the interruption button so as to reduce the influence of faults on the steam turbine loop to the minimum. The control protection unit is used for detecting and controlling various abnormal conditions such as overspeed, low vacuum, axial displacement, low lubricating oil pressure and the like of the steam turbine loop, and is provided with redundant output instructions, and the control relay is operated when at least two paths of output instructions are controlled simultaneously, so that the misoperation of the control relay is avoided. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.