A method and device for thermal protection of thermal power plant

Abstract

The present invention discloses a method and device for thermal protection of a thermal power plant, the method comprising: S1, detecting a protection action state signal, and performing a non-operation to obtain a reverse detection protection action state signal; S2, performing an AND operation on the protection throw-in signal input by a user and the reverse detection protection action state signal, and then outputting the signal as the S-end input of an RS trigger; S3, performing a non-operation on the protection throw-in signal input by the user and then serving as the R-end input of the RS trigger; S4, performing an AND operation on the protection throw-in signal input by the user and then outputting a protection action instruction. The protection throw-in adopts the S-end of the RS trigger, and the protection throw-out adopts the R-end of the RS trigger. The protection throw-in signal input by the user is a constant 0 or 1, the operation is convenient and intuitive, and it conforms to the common sense of operation of thermal workers; while ensuring the normal protection throw-in, it also ensures that when the protection action state signal is 1, the protection throw-in default value is set to 0 or 1, and no protection action instruction is issued.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plant protection and shutdown, and in particular to a method and device for thermal power plant thermal protection and shutdown. Background Art

[0002] Protection switching refers to the management of the power plant's switching on and off of automatic protection devices (such as gates, switches, safety doors, etc.), which is of great significance for ensuring the safe operation of equipment and reducing losses. These automatic protection devices will automatically operate under the set parameter conditions, and of course they can also be switched manually. However, once these devices are switched on or off, they must be restored to their original state, so for the same protection device, they appear in pairs. The power plant needs to manage this work, so there is protection switching management.

[0003] The main equipment of thermal power plants include boilers, steam turbines, generators, small machines and fans, etc. The protection of the above equipment is called main protection. During the start-up and shutdown and operation of the unit, thermal workers may be required to release the main protection for some reasons. In the process of releasing the main protection, there is a risk of the unit tripping due to release errors or incorrect protection input. Generally, DCS protection is used to directly force the real-time value of the point information output by the protection to be 0, or use the switch button.

[0004] The above solutions all have disadvantages, such as inconvenient operation, and operating errors may cause unit tripping or equipment damage. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for launching and disabling thermal protection in a thermal power plant, which can avoid unit tripping or equipment damage caused by human factors during the launching and disabling of protection by thermal workers.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for thermal protection startup and shutdown of a thermal power plant, comprising:

[0007] S1, detect the protection action state signal, and perform non-operation to obtain the anti-detection protection action state signal;

[0008] S2, the protection throw-in / out signal input by the user is ANDed with the anti-detection protection action state signal and then output as the S-terminal input of the RS trigger;

[0009] S3, the protection activation / deactivation signal input by the user is used as the R terminal input of the RS trigger after a non-operation;

[0010] S4, the protection action state signal is ANDed with the output of the RS trigger, and then a protection action instruction is output.

[0011] It also includes using a first indicator light to indicate the protection action status signal, using a second indicator light to indicate the protection activation / deactivation signal input by the user, and using a third indicator light to indicate the protection action instruction.

[0012] The method further includes displaying the protection action status signal, the protection activation / deactivation signal input by the user and the protection action instruction through a display.

[0013] Wherein, after S4, it also includes:

[0014] S5, detecting whether the protection activation / deactivation signal input by the user changes;

[0015] If so, S6, output a prompt signal.

[0016] Wherein, after S6, the method further includes:

[0017] Save and display the log corresponding to the current protection action instruction.

[0018] In addition, an embodiment of the present invention further provides a device for thermal protection activation and deactivation of a thermal power plant, comprising a first NOT gate circuit, a second NOT gate circuit, a first AND gate circuit, a second AND gate circuit and an RS trigger, wherein the first NOT gate circuit receives a protection action status signal and performs an AND operation on the protection activation and deactivation signal input by the user, which is input into the first AND gate circuit and then output to the S input end of the RS trigger, the protection activation and deactivation signal input by the user is input into the second NOT gate circuit and then output to the R input end of the RS trigger after a NOT operation, and the output end of the RS trigger performs an AND operation on the protection action status signal through the second AND gate circuit and then outputs a protection action instruction.

[0019] It also includes a first indicator light for receiving and displaying the protection action status signal, a second indicator light for receiving and displaying the protection activation / deactivation signal input by the user, and a third indicator light for displaying the protection action instruction output by the second AND gate circuit.

[0020] It also includes a display connected to the first NOT gate circuit, the second NOT gate circuit and the second AND gate circuit, which is used to display the protection action status signal input into the first NOT gate circuit, the user-input protection activation / deactivation signal input into the second NOT gate circuit and the protection action instruction output from the second AND gate circuit.

[0021] The device also includes a user input protection activation / deactivation signal detector connected to the second NOT gate circuit and the display, and sends a prompt signal after the user input protection activation / deactivation signal changes.

[0022] It also includes a log output unit connected to the protection throw-in / out signal detector and the display, which is used to save and display the log corresponding to the current protection action instruction through the display.

[0023] The method and device for thermal protection of a thermal power plant provided by the embodiment of the present invention have the following advantages compared with the prior art:

[0024] The method and device for thermal protection activation and deactivation of a thermal power plant provided by the embodiment of the present invention adopt the S end of an RS trigger for protection activation and the R end of an RS trigger for protection deactivation. The protection activation and deactivation signal input by a user is a constant 0 or 1. The operation is convenient and intuitive, and conforms to the common sense of thermal workers. While ensuring the normal activation of the protection, it also ensures that when the protection action state signal is 1, the protection activation and deactivation default value is set to 0 or 1, and no protection action command is issued. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic flow chart of steps of an embodiment of a method for thermal protection activation and deactivation of a thermal power plant provided by an embodiment of the present invention;

[0027] Figure 2 A schematic flow chart of steps of another embodiment of the method for thermal protection startup and shutdown of a thermal power plant provided by an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of an embodiment of a thermal protection device for a thermal power plant provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Please refer to Figure 1 to Figure 3 , Figure 1 A schematic flow chart of steps of an embodiment of a method for thermal protection activation and deactivation of a thermal power plant provided by an embodiment of the present invention; Figure 2A schematic flow chart of steps of another embodiment of the method for thermal protection startup and shutdown of a thermal power plant provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of an embodiment of a thermal protection device for a thermal power plant provided in an embodiment of the present invention.

[0031] In a specific embodiment, the method for thermal protection startup and shutdown of a thermal power plant comprises:

[0032] S1, detect the protection action state signal, and perform non-operation to obtain the anti-detection protection action state signal;

[0033] S2, the protection throw-in / out signal input by the user is ANDed with the anti-detection protection action state signal and then output as the S-terminal input of the RS trigger;

[0034] S3, the protection activation / deactivation signal input by the user is used as the R terminal input of the RS trigger after a non-operation;

[0035] S4, after performing an AND operation on the protection action state signal and the output of the RS trigger, a protection action instruction is output.

[0036] By using the S end of the RS trigger for protection input and the R end of the RS trigger for protection output, the protection input and output signals input by the user are constant 0 or 1, which is convenient and intuitive to operate and conforms to the common sense of thermal workers. While ensuring the normal protection input, it also ensures that when the protection action status signal is 1, the protection input and output default values ​​are set to 0 or 1, and no protection action instructions will be issued.

[0037] Since the existing protection investment and withdrawal status needs to be checked mainly through logic configuration or paper logic mandatory record book, the timeliness and convenience are poor.

[0038] In order to solve this problem, in one embodiment, the method for launching and disabling thermal protection of a thermal power plant also includes using a first indicator light to indicate the protection action status signal, using a second indicator light to indicate the protection launching and disabling signal input by the user, and using a third indicator light to indicate the protection action instruction.

[0039] Various status signals and output indications are provided by indicator lights, so thermal workers only need to observe the status of the indicator lights to make accurate judgments, which improves timeliness and convenience.

[0040] It should be pointed out that the present invention does not limit the type structure, size and indication method of the first indicator light, the second indicator light and the third indicator light. They can be indicated by a predetermined color, according to the light intensity, according to whether the output light of the indicator light flashes, as well as other types of indicator lights.

[0041] In the present invention, the protection is put into operation using the S end of the RS trigger, and the protection is withdrawn using the R end of the RS trigger. The protection input and withdrawal signal input by the user is a constant 0 or 1. The operation is convenient and intuitive, and conforms to the operational common sense of thermal workers. While ensuring the normal protection input, it also ensures that when the protection action state signal is 1, the protection input and withdrawal default value is set to 0 or 1, and no protection action command will be issued.

[0042] The prior art protection input uses a protection input pulse instruction, while the present invention uses a protection input and output default value (constant 0 or 1), which is manually input by the thermal worker, 0 represents protection output, and 1 represents protection input; the prior art protection input uses the R end of the RS trigger circuit, while the present invention uses the S end of the RS trigger circuit; the prior art protection output uses the S end of the RS trigger circuit, while the present invention uses the R end of the RS trigger circuit; the prior art protection input or output must have a pulse instruction, while the present invention can realize automatic switching of protection input or output, and the protection is either in the input state or in the output state; the prior art protection input or output uses a separate pulse instruction, if the protection action state signal is 1, the prior art will have the problem of protection refusal to operate, but the present application will not have this problem, and can effectively avoid the situation of protection malfunction when the protection action state signal is 1.

[0043] In order to further improve the clear display of the protection exit status, in one embodiment, the method for thermal protection activation and deactivation of a thermal power plant further includes displaying the protection action status signal, the protection activation and deactivation signal input by the user, and the protection action instruction through a display.

[0044] The protection action status signal, the protection activation / deactivation signal input by the user and the protection action instruction are displayed on the display, so that thermal workers can directly obtain more important signal information without further judgment, and the efficiency is further improved.

[0045] Since misoperation may occur in actual use, although it will not change the actual protection launch and retreat status, it needs to be recorded so that the staff can obtain this status in time. Therefore, after S4, it also includes:

[0046] S5, detecting whether the protection activation / deactivation signal input by the user changes;

[0047] If so, S6, output a prompt signal.

[0048] It should be pointed out that the present invention does not limit the method and specific content of the output prompt signal. The prompt signal can be output on a display or an indicator light, or output simultaneously, or sent to a designated person by text message or the like.

[0049] In order to save all the insurance refund instruction information so as to correspond to the corresponding maintenance record and also save the operation of the corresponding thermal worker, after S6, the following is also included:

[0050] Save and display the log corresponding to the current protection action instruction.

[0051] The present invention does not limit the display content and display method of the log corresponding to the current protection action instruction. The log may be recorded and displayed in a table or in other ways.

[0052] In addition, an embodiment of the present invention further provides a device for thermal protection activation and deactivation of a thermal power plant, comprising a first NOT gate circuit 40, a second NOT gate circuit 50, a first AND gate circuit 60, a second AND gate circuit 70 and an RS trigger 80. The first NOT gate circuit 40 receives a protection action state signal 10 and performs an AND operation on the protection activation and deactivation signal 20 input by the user, which is input into the first AND gate circuit 60 and then output to the S input end of the RS trigger 80. The protection activation and deactivation signal 20 input by the user is input into the second NOT gate circuit 50 and then output to the R input end of the RS trigger 80 after a NOT operation. The output end of the RS trigger 80 performs an AND operation on the protection action state signal 10 through the second AND gate circuit 70 and then outputs a protection action instruction 30.

[0053] Since the device for thermal protection activation and deactivation of a thermal power plant is a device corresponding to the method for thermal protection activation and deactivation of a thermal power plant described above, and has the same beneficial effects, the present invention will not elaborate on this.

[0054] By using the S end of the RS trigger 80 for protection input and the R end of the RS trigger 80 for protection output, the protection input and output signal 20 input by the user is a constant 0 or 1, which is convenient and intuitive to operate and conforms to the operational common sense of thermal workers; while ensuring the normal protection input, it also ensures that when the protection action state signal 10 is 1, the protection input and output default value is set to 0 or 1, and the protection action instruction 30 will not be issued.

[0055] Since the existing protection investment and withdrawal status needs to be checked mainly through logic configuration or paper logic mandatory record book, the timeliness and convenience are poor.

[0056] Since the existing protection investment and withdrawal status needs to be checked mainly through logic configuration or paper logic mandatory record book, the timeliness and convenience are poor.

[0057] In order to solve this problem, in one embodiment, the method and device for thermal protection activation and deactivation of a thermal power plant also include a first indicator light for receiving and displaying the protection action status signal 10, a second indicator light for receiving and displaying the protection activation and deactivation signal 20 input by the user, and a third indicator light for displaying the protection action instruction 30 output by the second AND gate circuit 70.

[0058] Various status signals and output indications are provided by indicator lights, so thermal workers only need to observe the status of the indicator lights to make accurate judgments, which improves timeliness and convenience.

[0059] It should be pointed out that the present invention does not limit the type structure, size and indication method of the first indicator light, the second indicator light and the third indicator light. They can be indicated by a predetermined color, according to the light intensity, according to whether the output light of the indicator light flashes, as well as other types of indicator lights.

[0060] In order to further improve the clear display of the protection exit status, in one embodiment, the thermal protection activation and deactivation device of the thermal power plant also includes a display connected to the first NOT gate circuit 40, the second NOT gate circuit 50 and the second AND gate circuit 70, which is used to display the protection action status signal 10 input into the first NOT gate circuit 40, the user-input protection activation and deactivation signal 20 input into the second NOT gate circuit 50 and the protection action instruction output by the second AND gate circuit 70.

[0061] The protection action status signal 10, the protection activation / deactivation signal 20 input by the user and the protection action instruction 30 are displayed on the display, so that thermal workers can directly obtain more important signal information without further judgment, and the efficiency is further improved.

[0062] Since misoperation may occur in actual use, although the actual protection activation and deactivation status will not be changed, it needs to be recorded so that the staff can obtain this status in time. Therefore, in one embodiment, the method and device for thermal protection activation and deactivation of a thermal power plant also includes a user-input protection activation and deactivation signal 20 detector connected to the second NOT gate circuit 50 and the display, and sends a prompt signal after the user-input protection activation and deactivation signal 20 changes.

[0063] The present invention does not limit the detector of the protection activation / deactivation signal 20 input by the user.

[0064] In order to save all insurance activation and deactivation instruction information so that it corresponds to the corresponding maintenance records and can also save the operations of the corresponding thermal workers, in one embodiment, the thermal power plant thermal protection activation and deactivation device also includes a log output unit connected to the protection activation and deactivation signal detector and the display, which is used to save and display the log corresponding to the current protection action instruction 30 through the display.

[0065] The present invention does not limit the display content and display method of the log corresponding to the current protection action instruction 30. The log may be recorded and displayed in a table or in other ways.

[0066] The prior art protection input uses a protection input pulse instruction, while the present invention uses a protection input and output default value (constant 0 or 1), which is manually input by the thermal worker, 0 represents protection output, and 1 represents protection input; the prior art protection input uses the R end of the RS trigger circuit, while the present invention uses the S end of the RS trigger circuit; the prior art protection output uses the S end of the RS trigger circuit, while the present invention uses the R end of the RS trigger circuit; the prior art protection input or output must have a pulse instruction, while the present invention can realize automatic switching of protection input or output, and the protection is either in the input state or in the output state; the prior art protection input or output uses a separate pulse instruction, if the protection action state signal is 1, the prior art will have the problem of protection refusal to operate, but the present application will not have this problem, and can effectively avoid the situation of protection malfunction when the protection action state signal is 1.

[0067] In summary, the method and device for thermal protection activation and deactivation of a thermal power plant provided by the embodiment of the present invention adopts the S end of the RS trigger for protection activation and the R end of the RS trigger for protection deactivation. The protection activation and deactivation signal input by the user is a constant 0 or 1. The operation is convenient and intuitive, and conforms to the operational common sense of thermal workers. While ensuring the normal activation of the protection, it also ensures that when the protection action state signal is 1, the protection activation and deactivation default value is set to 0 or 1, and no protection action command will be issued.

[0068] The above is a detailed introduction to the method and device for thermal protection of thermal power plants provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for thermal protection startup and shutdown of a thermal power plant, characterized in that: include: S1, detect the protection action state signal, and perform non-operation to obtain the anti-detection protection action state signal; S2, the protection throw-in / out signal input by the user is ANDed with the anti-detection protection action state signal and then output as the S-terminal input of the RS trigger; S3, the protection activation / deactivation signal input by the user is used as the R terminal input of the RS trigger after a non-operation; S4, the protection action state signal is ANDed with the output of the RS trigger and then a protection action instruction is output; the process also includes indicating the protection action state signal with a first indicator light, indicating the protection activation / deactivation signal input by the user with a second indicator light, and indicating the protection action instruction with a third indicator light; It also includes displaying the protection action status signal, the protection activation / deactivation signal input by the user and the protection action instruction through a display.

2. The method for thermal protection startup and shutdown of a thermal power plant according to claim 1, characterized in that: After S4, the method further includes: S5, detecting whether the protection activation / deactivation signal input by the user changes; If so, S6, output a prompt signal.

3. The method for thermal protection startup and shutdown of a thermal power plant according to claim 2, characterized in that: After S6, the method further includes: Save and display the log corresponding to the current protection action instruction.

4. A device for thermal protection activation and deactivation of a thermal power plant, characterized in that: The invention comprises a first NOT gate circuit, a second NOT gate circuit, a first AND gate circuit, a second AND gate circuit and an RS trigger, wherein the first NOT gate circuit receives a protection action state signal and performs a NOT operation on the protection on / off signal input by the user inputted into the first AND gate circuit and then outputs the signal to the S input end of the RS trigger, the protection on / off signal inputted by the user is inputted into the second NOT gate circuit and then outputs the signal to the R input end of the RS trigger after a NOT operation, the output end of the RS trigger and the protection action state signal are ANDed with the second AND gate circuit and then output a protection action instruction, the invention also comprises a first indicator light for receiving and displaying the protection action state signal, a second indicator light for receiving and displaying the protection on / off signal inputted by the user and a third indicator light for displaying the protection action instruction outputted by the second AND gate circuit, and a display connected to the first NOT gate circuit, the second NOT gate circuit and the second AND gate circuit and used to display the protection action state signal inputted into the first NOT gate circuit, the protection on / off signal inputted by the user inputted into the second NOT gate circuit and the protection action instruction outputted by the second AND gate circuit.

5. The thermal protection device for thermal power plants as claimed in claim 4, characterized in that: It also includes a user input protection activation / deactivation signal detector connected to the second NOT gate circuit and the display, and sends a prompt signal after the user input protection activation / deactivation signal changes.

6. The thermal protection device for thermal power plants as claimed in claim 5, characterized in that: It also includes a log output unit connected to the protection throw-in / out signal detector and the display, and is used to save and display the log corresponding to the current protection action instruction through the display.

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