阅读说明：本技术 一种液压蝶阀控制系统 (Hydraulic butterfly valve control system ) 是由 郭勇 陈明亮 许洪德 焦宗林 郑全 张忠华 石峰 贺志 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种液压蝶阀控制系统,所述系统包括：DCS分散控制系统控制模块和DCS分散控制系统逻辑判断模块,所述DCS分散控制系统接入阀位反馈装置输出的信号,进行阀位反馈故障诊断逻辑处理,逻辑判断模块分别连接模拟量输出模块和开关量输出模块,分别进行比例阀和锁定阀的控制,根据故障反馈进行声光报警本发明解决了现有液压蝶阀控制系统故障判断不全面、不能直观反馈故障的问题。(The invention discloses a hydraulic butterfly valve control system, which comprises: the hydraulic butterfly valve control system comprises a DCS distributed control system control module and a DCS distributed control system logic judgment module, wherein the DCS distributed control system is connected with a signal output by a valve position feedback device to carry out valve position feedback fault diagnosis logic processing, the logic judgment module is respectively connected with an analog quantity output module and a switching value output module to respectively control a proportional valve and a locking valve, and acousto-optic alarm is carried out according to fault feedback.)

1. A hydraulic butterfly valve control system, the system comprising: the DCS comprises a DCS distributed control system control module and a DCS distributed control system logic judgment module, wherein the DCS distributed control system is connected with a signal output by the valve position feedback device to perform valve position feedback fault diagnosis logic processing, the logic judgment module is respectively connected with the analog quantity output module and the switching value output module to control the proportional valve and the locking valve respectively, and acousto-optic alarm is performed according to fault feedback.

2. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system control module is connected to a DCS distributed control system AI module, and the DCS distributed control system AI module accesses 4-20mA signals output by the two valve position feedback devices by using a cable spare core to collect the signals.

3. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system control module is connected to a DCS distributed control system AI module for performing point and logic configuration processing.

4. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system logic decision module is connected to the DCS distributed control system control module, and outputs a proportional valve control command according to a deviation between a valve position feedback and a command after being processed by the valve position feedback fault diagnosis logic.

5. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system logic determination module is connected to an analog output module and a switching value output module, respectively, and outputs a 4-20mA proportional valve control command through the analog output module to implement valve position control of a butterfly valve, and the switching command output by the switching value output module is sent to the lock valve by using a cable spare core according to a deviation between valve position feedback and the command to implement control of a power supply of the lock valve.

6. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system feeds back fault diagnosis logic according to the valve position, and if a fault occurs, an audible and visual alarm is triggered to remind an operator of paying attention.

7. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system is adapted to adjust a high/low limit value of the valve position feedback fault diagnosis logic and an analog delay time, and set the scan cycle parameters according to characteristics of the DCS distributed control system.

8. The hydraulic butterfly valve control system of claim 1, wherein the logic judgment module of the DCS is provided with an analog quantity delay and high-low value judgment algorithm block, and whether the feedback signal is halted or not is judged according to the condition change of the feedback signal and the command deviation within different time after the valve position command is sent out.

9. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system logic determination module is provided with a quality determination algorithm block for determining whether a critical failure has occurred in the valve position feedback device, the DCS analog input module, or the signal line.

10. The hydraulic butterfly valve control system of claim 1, wherein the DCS distributed control system automatically switches to another valve position feedback signal when it determines that a fault has occurred; when two valve position feedback devices are in fault, the logic is automatically switched to a valve position instruction signal, at the moment, a valve position instruction in a valve position adjusting loop is equal to feedback, the proportional valve does not act, and the valve keeps the current position.

Technical Field

The invention relates to the technical field of valve control, in particular to a hydraulic butterfly valve control system.

Background

A heat supply butterfly valve is additionally arranged on a low-pressure steam guide pipe in the heat supply project of the existing supercritical unit, the butterfly valve adopts an automatic control quick-closing regulating valve, the hydraulic regulating function is electrified through a quick-acting electromagnetic valve, pressure oil P is conveyed to a control cavity of a cartridge valve through the electromagnetic valve, and the cartridge valve is closed; the locking valve is electrified, the proportional valve receives a valve position instruction signal, and an oil inlet (oil return) passage is opened or closed so as to realize the adjustment and control of the valve position. The butterfly valve position feedback device employs an inductive linear displacement sensor that integrates a transmitter and receiver coil system that are printed on a circuit board in the form of printed coils. Feedback signals of two valve position feedback devices are installed on site, PLC redundancy configuration is introduced, a first device signal is defaulted to be a valve position signal to participate in valve position adjustment, and when the signal exceeds a normal range (4-20 mA), the signal is switched to be a second standby device signal. The PLC receives a 4-20mA instruction signal sent by the remote DCS and a 4-20mA valve position feedback signal of the local valve position feedback device, when the instruction and the feedback signal have deviation, a-10V voltage signal is logically output to drive the proportional valve, the valve linearly changes along with the signal, when the instruction and the feedback deviation are eliminated, the proportional valve receives a 0V voltage signal and does not act, and the valve keeps the current position.

The valve position feedback device of the butterfly valve adopts an inductive linear displacement sensor, the device is halted for a plurality of times, a feedback signal is fixed and unchanged, and the device does not send out fault state indication. The PLC fault judgment logic is incomplete, and the logic cannot be automatically switched to a valve position feedback device signal which normally works. The deviation between the instruction and the feedback always exists, so that the steam exhaust butterfly valve of the intermediate pressure cylinder moves towards one direction, and further system disturbance and equipment damage accidents occur. Logics such as valve opening and valve closing of the steam exhaust butterfly valve of the intermediate pressure cylinder are realized in a local PLC, visual display and monitoring cannot be achieved, ladder diagram logic languages in the PLC are not widely applied, and accident analysis is not convenient for maintainers.

Disclosure of Invention

Therefore, the invention provides a hydraulic butterfly valve control system, which aims to solve the problems that the existing hydraulic butterfly valve control system is incomplete in fault judgment and cannot feed back faults visually.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention discloses a hydraulic butterfly valve control system, which comprises: the DCS comprises a DCS distributed control system control module and a DCS distributed control system logic judgment module, wherein the DCS distributed control system is connected with a signal output by the valve position feedback device to perform valve position feedback fault diagnosis logic processing, the logic judgment module is respectively connected with the analog quantity output module and the switching value output module to control the proportional valve and the locking valve respectively, and acousto-optic alarm is performed according to fault feedback.

Furthermore, the DCS distributed control system control module is connected with a DCS distributed control system AI module, and the DCS distributed control system AI module accesses 4-20mA signals output by the two valve position feedback devices by using the cable standby core to collect the signals.

Further, the DCS distributed control system control module is connected with the DCS distributed control system AI module to perform point and logic configuration processing.

Further, the logic judgment module of the DCS is connected with the control module of the DCS, and outputs a proportional valve control instruction according to the deviation between the valve position feedback and the instruction after being processed by the valve position feedback fault diagnosis logic.

Furthermore, the logic judgment module of the DCS distributed control system is respectively connected with an analog quantity output module and a switching value output module, 4-20mA proportional valve control instructions are output through the analog quantity output module to realize valve position control of the butterfly valve, and according to deviation between valve position feedback and the instructions, the switching instructions output by the switching value output module are sent to the locking valve by using the cable standby core to realize control of the switching power supply of the locking valve.

Further, the DCS distributed control system feeds back fault diagnosis logic according to the valve position, and if a fault occurs, sound and light alarm is triggered to remind operating personnel to pay attention.

Furthermore, the DCS is debugged, the high-low limit value and the analog quantity delay time of the valve position feedback fault diagnosis logic are adjusted, and the scanning period parameters are set according to the characteristics of the DCS.

Furthermore, an analog quantity delay and high-low value judgment algorithm block is arranged in the logic judgment module of the DCS distributed control system, and whether the feedback self-signal is halted or not is judged according to the condition change condition of the feedback signal and the instruction deviation in different time after the valve position instruction is sent out.

Furthermore, a quality judgment algorithm block is arranged in the logic judgment module of the DCS distributed control system, and whether serious faults occur in the valve position feedback device, the DCS system analog input module or the signal line is judged.

Further, when the DCS distributed control system judges that one fault occurs, the DCS distributed control system automatically switches to the other valve position feedback signal; when two valve position feedback devices are in fault, the logic is automatically switched to a valve position instruction signal, at the moment, a valve position instruction in a valve position adjusting loop is equal to feedback, the proportional valve does not act, and the valve keeps the current position.

The invention has the following advantages:

the invention discloses a hydraulic butterfly valve control system, which is used for improving and optimizing the defects of the original heat supply butterfly valve control mode again, changing the original local PLC control mode into a remote DCS control system, enriching and perfecting valve position fault diagnosis logic and simplifying the intermediate link of control. The faults are fed back comprehensively and intuitively, and the problems are found conveniently and quickly. The structure is simple, the maintenance is convenient, the operation is visual and controllable, and the safety and the reliability are realized; for thermal control maintenance personnel, the logic configuration work is easier to operate and realize by adopting a familiar DCS, and the daily maintenance and the accident analysis are more convenient; the monitoring of the operating personnel is more intuitive, and the operation is more stable and safer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a working schematic diagram of a hydraulic butterfly valve control system according to an embodiment of the present invention;

FIG. 2 is a logic diagram of valve position feedback fault diagnosis of a hydraulic butterfly valve control system according to an embodiment of the present invention;

FIG. 3 is a logic diagram of a proportional valve control of a hydraulic butterfly valve control system according to an embodiment of the present invention;

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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 invention.

Examples

The embodiment discloses a hydraulic pressure butterfly valve control system, the system includes: the DCS comprises a DCS distributed control system control module and a DCS distributed control system logic judgment module, wherein the DCS distributed control system is connected with a signal output by the valve position feedback device to perform valve position feedback fault diagnosis logic processing, the logic judgment module is respectively connected with the analog quantity output module and the switching value output module to control the proportional valve and the locking valve respectively, and acousto-optic alarm is performed according to fault feedback.

The DCS distributed control system AI module accesses 4-20mA signals output by the two valve position feedback devices by using the cable standby core to acquire the signals;

the DCS distributed control system control module is connected with the DCS distributed control system AI module to perform point and logic configuration processing; and the DCS distributed control system logic judgment module is connected with the DCS distributed control system control module, and outputs a proportional valve control instruction according to the deviation between the valve position feedback and the instruction after being processed by the valve position feedback fault diagnosis logic.

The DCS distributed control system logic judgment module is respectively connected with an analog quantity output module and a switching value output module, 4-20mA proportional valve control instructions are output through the analog quantity output module to realize valve position control of the butterfly valve, and according to deviation between valve position feedback and instructions, the switching instructions output by the switching value output module are sent to the locking valve by using the cable standby core to realize control of a switching power supply of the locking valve. And the DCS feeds back fault diagnosis logic according to the valve position, and if a fault occurs, an audible and visual alarm is triggered to remind operating personnel to pay attention. And debugging, adjusting the high-low limit value of the valve position feedback fault diagnosis logic and the analog quantity delay time, and setting scanning period parameters according to the characteristics of the DCS distributed control system.

In the embodiment, the abundant control algorithm of the DCS distributed control system is utilized to configure the valve position feedback fault diagnosis logic, so that various faults of the inductive linear displacement sensor are effectively judged. And the analog quantity delay and high-low value judgment algorithm block judges whether the feedback self-signal is halted or not according to the condition change of the feedback signal and the instruction deviation in different time after the valve position instruction is sent out. And the quality judgment algorithm block judges whether serious faults occur in the valve position feedback device, the DCS analog input module or the signal line.

When any fault occurs, the other path of valve position feedback signal is automatically switched; when two valve position feedback devices are in fault, the logic is automatically switched to a valve position instruction signal, at the moment, a valve position instruction in a valve position adjusting loop is equal to feedback, the proportional valve does not act, and the valve keeps the current position. A function f (x) module is adopted to adjust corresponding proportional parameters according to the deviation between the instructions and the feedback of the heat supply butterfly valve and output proportional valve control instructions; whether the butterfly valve is in opening and closing action can be judged according to the deviation, and at the moment, a locking valve electrification instruction is sent out, the locking valve is closed, and the supply of hydraulic oil is guaranteed.

The hydraulic butterfly valve control system disclosed by the invention is improved and optimized again aiming at the defects of the original heat supply butterfly valve control mode, the original local PLC control mode is changed into a remote DCS control system, the valve position fault diagnosis logic is enriched and perfected, and the intermediate link of control is simplified. The faults are fed back comprehensively and intuitively, and the problems are found conveniently and quickly. The structure is simple, the maintenance is convenient, the operation is visual and controllable, and the safety and the reliability are realized; for thermal control maintenance personnel, the logic configuration work is easier to operate and realize by adopting a familiar DCS, and the daily maintenance and the accident analysis are more convenient; the monitoring of the operating personnel is more intuitive, and the operation is more stable and safer.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.