CN113700920B

CN113700920B - Two-position self-holding electric/pneumatic valve driving stage based on FOXBORO system

Info

Publication number: CN113700920B
Application number: CN202110849724.3A
Authority: CN
Inventors: 陆爱行; 李伟
Original assignee: Huaneng Chaohu Power Generation Co Ltd
Current assignee: Huaneng Chaohu Power Generation Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-03-11
Anticipated expiration: 2041-07-27
Also published as: CN113700920A

Abstract

The invention discloses a FOXBORO system-based two-position self-holding electric/pneumatic valve driving stage, which is applied to a touch panel, a driving stage, a DO card, a DI card and on-site equipment, and is characterized in that the method comprises the following steps: generating an on-off control signal of a DO card according to the signal output by the driving stage, and sending the on-off control signal of the DO card to a DI card; and when the drive stage receives the signal of the DI card and cannot control the local equipment within the preset time, the local equipment is in a fault state, so that the fault state is displayed based on the touch panel. By the method, the problem that the valve can still be operated under the condition that the interlocking on/off signal exists, so that the interlocking signal loses the protection effect can be solved, and the safety of the system in use is improved.

Description

Two-position self-holding electric/pneumatic valve driving stage based on FOXBORO system

Technical Field

The invention relates to the technical field of communication, in particular to a FOXBORO system-based two-position drive stage with a self-holding electric/pneumatic valve.

Background

The Foxboro system comprises a high-speed controller, a field device management tool, a maintenance response center, an enterprise historical database, a multi-layer redundancy and network security strengthening system. The system can provide excellent visibility to historical data and provide real-time and predictable operation information, thereby helping users to improve production efficiency. At present, electric/pneumatic/hydraulic valves applied to most thermal power plants are controlled by adopting double operations of manual start-stop and interlocking start-stop, and most of the valves realize a switch control function by using an electromagnetic valve or an electric actuating mechanism and are used for solving the problem that the valves can still be operated under the condition that interlocking on-off signals exist, so that the interlocking signals lose the protection effect.

Therefore, how to provide a two-position driving stage with self-holding electric/pneumatic valve based on FOXBORO system is a technical problem to be solved at present.

Disclosure of Invention

The invention discloses a FOXBORO system-based two-position self-holding electric/pneumatic valve driving stage method, which is used for solving the problem that the service life of equipment is shortened due to long-term electrification in the prior art. The method is applied to a touch panel, a driving stage, a DO card, a DI card and in-situ equipment, and is characterized by comprising the following steps:

generating an on-off control signal of a DO card according to the signal output by the driving stage, and sending the on-off control signal of the DO card to a DI card;

and when the drive stage receives the signal of the DI card and cannot control the local equipment within the preset time, the local equipment is in a fault state, so that the fault state is displayed based on the touch panel.

Preferably, when the driving stage receives a signal from the DI card and cannot control the local device within a preset time, the method specifically includes:

the on-site equipment receives an opening instruction and a closing instruction output by the DO card;

the on command is output from a driver stage BO01, and the off command is output from a driver stage BO 02.

Preferably, the generating of the switch control signal of the DO card according to the signal output by the driving stage specifically includes:

the signal output by the driving stage is a pulse signal, and the duration of the pulse signal is 3 seconds.

Preferably, when the driving stage receives a reset instruction, the driving stage sends a position signal to the RS flip-flop.

Preferably, when the driving stage receives a reset instruction, the driving stage sends a position signal to the RS flip-flop, specifically:

and the pulse signal of the RS trigger is a low-level signal.

Correspondingly, this application has still provided a two position based on FOXBORO system and has kept electronic/pneumatic valve drive level device of pneumatic valve of self-holding, is applied to touch panel, drive level, DO fastener, DI fastener, local equipment, its characterized in that, the device includes:

the generating module generates an on-off control signal of the DO card according to the signal output by the driving stage, and the on-off control signal of the DO card is sent to the DI card;

and the processing module is used for displaying the fault state based on the touch panel when the drive stage receives the signal of the DI clamping piece and cannot control the local equipment within the preset time.

Preferably, the processing module is specifically configured to:

preferably, the generating module is specifically configured to:

Preferably, the pulse signal of the RS flip-flop is a low level signal.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a FOXBORO system-based two-position self-holding electro/pneumatic valve driving stage according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a two-position self-holding electro/pneumatic valve driving stage structure based on the FOXBORO system according to the embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating the operation effect of a FOXBORO system-based two-position self-holding electro/pneumatic valve driving stage according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in the background art, the valve can still be operated under the condition that the interlocking on/off signals exist in the prior art, so that the interlocking signals lose the protection function, and the safety of the system in use is reduced.

In order to solve the above problems, the embodiment of the application is applied to logic control of a DCS system in an industrial production field, and is an improved method which is simple in structure and convenient to popularize and apply. The application provides a two positions take self-sustaining to move pneumatics valve drive stage based on FOXBORO system, is applied to touch panel, drive stage, DO fastener, DI fastener, local equipment, its characterized in that, the flow chart is as shown in FIG. 1, includes the following step:

s101, generating a switch control signal of a DO card according to the signal output by the driving stage, and sending the switch control signal of the DO card to a DI card;

specifically, the operator clicks the on or off button by using the control panel, as shown in fig. 2, the operator controls to turn over BI01 and BI02, judges whether to output a BO01 on command or a BO02 off command finally through the drive level logic, outputs a BO01 or BO02 through a DO card relay to control the local equipment, and sends a local equipment feedback signal back to the drive level through the DI card to participate in the logic judgment and display the local equipment feedback signal on the picture operation panel. On-site equipment includes, but is not limited to, solenoid valves or power gates.

In order to further solve the problem that the valve can still be operated under the condition that the interlocking on-off signals exist, in a preferred embodiment of the present application, the on-off control signal of the DO card is generated according to the signal output by the driving stage, specifically: the signal output by the driving stage is a pulse signal, and the duration of the pulse signal is 3 seconds.

Specifically, the pulse signal is a discrete signal, and compared with a common analog signal, the waveforms are discontinuous on the Y axis, and the waveforms have obvious intervals, but have certain periodicity. The instantaneous sudden change, the voltage or current with extremely short action time is called pulse signal. The signals of the digital circuit used in the computer can be periodically repeated, can also be non-periodic or single time, and the high level and the low level are represented by 0 and 1. In this invention, the duration of the pulse signal is 3 seconds, and the RS flip-flop level is changed with a delay of 3 seconds.

And S102, when the drive stage receives the signal of the DI card and cannot control the local equipment within a preset time, the local equipment is in a fault state, and the fault state is displayed based on the touch panel.

Specifically, whether to connect the points is selected according to the conditions of the equipment, as shown in fig. 2, the operation panel valves are in fault connection with O27 and O26, and the on or off command is sent for a period of time, and the equipment is considered to be in a non-moving and fault state. The feedback fault connects BI07 and BI08, and the incoming panel feeds back the fault status. The fault time is set according to the stroke length of the valve, the command is sent out for a period of time, if the switch is not in place, the switch is considered to be in fault, and the fault signal can be reset through the switch-in-place or switch-off command.

When the drive stage receives the signal of the DI card and controls the local equipment within the preset time, the local equipment is in a normal state, and the touch panel displays the running process normally.

To further address the problem of still being able to operate the valve in the presence of the interlock on and off signals, in the preferred embodiment of the present application, the in-situ device receives on and off commands from the DO cartridge; the on command is output from a driver stage BO01, and the off command is output from a driver stage BO 02.

Specifically, as shown in fig. 2, when the manual BI01 or the automatic BI03 is turned from 0 to 1, and at this time, the open enable BI05 is 0, the next step cannot be output, and if the open enable BI05 is 1, if the close command is 0, the operation is prohibited to 0, the M12 is 1, the S set terminal is changed from 0 to 1 by the RS flip-flop function, the R reset terminal is 0 if the set signal is in the future, and the RS flip-flop output is 1, that is, the M03 is 1, then the BO01 is always kept to output 1, and the on command relay always operates to be charged, and since the manual on button is a 3S pulse, the S set terminal of the RS flip-flop after 3S is changed from 1 to 0 again, and the output 1 is kept until the R reset terminal controls a fault, turns off command, turns on to a position, and turns on a fault any one reset on command signal, and the on command is sent after M01 seconds, and the on command is sent.

To further address the problem of still being able to operate the valve in the presence of the interlock on and off signal, in the preferred embodiment of the present application, the driver stage sends a position signal to the RS flip-flop when the driver stage receives a reset command.

Specifically, the driver stage sends a signal when receiving a reset instruction.

In order to further solve the problem that the valve can still be operated under the condition that the interlocking on-off signals exist, in a preferred embodiment of the present application, when the driving stage receives a reset instruction, the driving stage sends a position signal to the RS flip-flop, specifically: and the pulse signal of the RS trigger is a low-level signal.

Specifically, a low level signal is used to achieve a technical effect.

This application has still provided a two positions area self-sustaining electro/pneumatic valve drive level device based on FOXBORO system, is applied to touch panel, drive level, DO fastener, DI fastener, equipment on the spot, and its characterized in that, the device includes:

Specifically, through the control module, an operator clicks an on-off button through a control panel, as shown in fig. 2, the BI01 and the BI02 are turned over, whether a BO01 on command or a BO02 off command is output finally is judged through drive level logic, the BO01 or the BO02 controls local equipment through DO card relay output, and a local equipment feedback signal is reversely sent to the drive level participation logic through a DI card and is displayed on a picture operation panel. On-site equipment includes, but is not limited to, solenoid valves or power gates.

Through the processing module, whether the connection point is connected or not is selected according to the using condition of the equipment, the operation panel valve is in fault connection with O27 and O26, and the on or off command sends a period of feedback and is not sent, so that the equipment is considered to be in a non-moving and fault state. The feedback fault connects BI07 and BI08, and the incoming panel feeds back the fault status. The fault time is set according to the stroke length of the valve, the command is sent out for a period of time, if the switch is not in place, the switch is considered to be in fault, and the fault signal can be reset through the switch-in-place or switch-off command.

In order to further solve the problem that the valve can still be operated in the presence of the interlock on/off signal, in a preferred embodiment of the present application, the processing module is specifically configured to: the on-site equipment receives an opening instruction and a closing instruction output by the DO card;

specifically, the manual BI01 or automatic BI03 is changed from 0 to 1, at this time, if the open permission BI05 is 0, the next step cannot be output, if the open permission BI01 is 1, if the close command is 0, the operation is prohibited to 0, the M12 is 1, through the RS flip-flop function, the S set terminal is changed from 0 to 1, the R reset terminal is 0 if the set signal is in the future, the RS flip-flop output is 1, that is, the M03 is 1, then the BO01 is always kept to output 1, the on command relay always operates to be electrified, since the manual on button is 3S pulse, the S set terminal of the RS flip-flop is changed from 1 to 0 after 3S, the output 1 is kept until the R reset terminal controls any one of the fault, the off command, the on position, and the on fault, and the on command is sent out, and after M01 seconds, the on command is considered to be in the future or the off command is sent out.

In order to further solve the problem that the valve can still be operated in the presence of the interlock on/off signal, in a preferred embodiment of the present application, the generating module is specifically configured to: the signal output by the driving stage is a pulse signal, and the pulse duration is 3 seconds.

To further address the problem of the valve still being operable in the presence of the interlock on and off signal, in a preferred embodiment of the present application,

Through applying the technical scheme, a certain power plant has the following technical effects:

(1) the technical scheme can prevent the control loop from being electrified for a long time so as to prolong the service life of the equipment;

(2) the equipment misoperation risk is reduced through logic judgment, and equipment fault finding is facilitated;

(3) the valve state is displayed in real time through a panel, as shown in fig. 3, so that an operator can quickly know the field state.

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

Claims

1. A FOXBORO system-based two-position drive stage method with self-holding electric/pneumatic valve, which is applied to touch panel, drive stage, DO card, DI card and in-situ equipment, and is characterized in that the method comprises the following steps:

2. A method as claimed in claim 1, characterized in that when the drive stage receives a signal from a DI card and cannot control the local device for a predetermined time, the method comprises:

3. The method as claimed in claim 1, wherein the generating of the switch control signal of the DO card according to the signal outputted from the driving stage comprises:

4. The method of claim 1, further comprising:

when the driving stage receives a reset instruction, the driving stage sends a position signal to the RS trigger.

5. The method of claim 4, wherein when the driver stage receives a reset command, the driver stage sends a position signal to the RS flip-flop, specifically:

and the pulse signal of the RS trigger is a low-level signal.

6. A two-position self-holding electric/pneumatic valve driving stage device based on FOXBORO system, applied to touch panel, driving stage, DO fastener, DI fastener, on-the-spot equipment, characterized in that the device comprises:

7. The apparatus of claim 6, wherein the processing module is specifically configured to: the on-site equipment receives an opening instruction and a closing instruction output by the DO card; wherein the on instruction is output by driver stage B001 and the off instruction is output by driver stage B002.

8. The apparatus of claim 6, wherein the generation module is specifically configured to: the signal output by the driving stage is a pulse signal, and the duration of the pulse signal is 3 seconds.

9. The apparatus of claim 6, wherein the driver stage sends a position signal to an RS flip-flop when the driver stage receives a reset instruction.

10. The apparatus of claim 9, wherein the pulse signal of the RS flip-flop is a low level signal.