Timing sequence program control system and method for efficient sedimentation tank

Abstract

The invention discloses a time sequence program control system of an efficient sedimentation tank, which belongs to the technical field of industrial automatic sewage treatment and comprises an SCADA (supervisory control and data acquisition) monitoring layer, a PLC (programmable logic controller) control layer and an equipment execution layer. The SCADA monitoring layer provides a human-computer interaction interface and is used for setting automatic operation parameters and automatic mode switching of the sludge pump and the sludge scraper; the PLC control layer runs an automatic timing program and a linkage program, and generates a control instruction based on parameters set by the SCADA layer; and the equipment execution layer comprises a sludge pump and a frequency converter of a sludge scraper, and is used for receiving and executing a control instruction of the PLC. Through sequential control and equipment linkage, the problems of insufficient sludge sedimentation time, high sludge discharge water content, high energy consumption and the like caused by continuous operation of original equipment in the efficient sedimentation tank are solved, and cost reduction and efficiency improvement are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial automation sewage treatment, and more particularly to a time sequence program control system and method for a high-efficiency sedimentation tank. BACKGROUND

[0002] In the sewage treatment process, after the secondary sedimentation tank discharges most of the residual sludge, a small amount of sludge enters the high-efficiency sedimentation tank with the effluent, and needs to be treated again through chemical and physical sedimentation. In the prior art, the high-efficiency equipment is continuously operated, and the sludge scraper and sludge pump of the sedimentation tank not only adopt a 24-hour uninterrupted operation mode, but more importantly, the two lack precise time sequence program linkage design, and are mostly independently started and stopped, which causes the sludge pump to start and the sludge scraper to run synchronously, the sludge is not fully settled before being scraped and discharged, and the proportion of clean water in the sludge pump discharge is extremely high. This "non-linkage" operation mode not only greatly increases the power consumption and operation and treatment cost, but also further shortens the equipment maintenance cycle and increases the downtime due to poor equipment coordination. The lack of time sequence linkage mechanism has become a core design defect that restricts the sludge discharge efficiency and operation economy of the high-efficiency sedimentation tank, and needs to be improved. SUMMARY

[0003] The present application aims to provide a time sequence program control system and method for a high-efficiency sedimentation tank, which solves the technical problems of poor control flexibility, poor equipment coordination, and high operation cost in the prior art, and achieves the goals of flexible parameter configuration, automatic fault processing, and efficient and economical operation.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A time sequence program control system for a high-efficiency sedimentation tank, comprising:

[0006] A SCADA monitoring layer configured to provide a human-machine interaction interface, the human-machine interaction interface comprising a mode switching unit for switching between automatic and manual modes, a time parameter setting unit for setting the running time and stopping time of the sludge pump and the sludge scraper, and a delay parameter setting unit for setting the start interval of the sludge pump and the sludge scraper;

[0007] A PLC control layer in communication connection with the SCADA monitoring layer, configured to run an automatic timing program and a linkage program to generate time sequence control instructions according to the time parameters and the delay parameters;

[0008] A device execution layer connected with the PLC control layer, comprising a sludge pump frequency converter and a sludge scraper frequency converter controlled by the time sequence control instructions.

[0009] Further, the automatic timing program in the PLC control layer is configured to set independent running timers and stop timers for the sludge pump and the sludge scraper respectively to realize periodic start-stop control.

[0010] Further, the linkage program in the PLC control layer is configured to trigger the sludge scraper to start when the running time of the sludge pump reaches the value of the delay parameter setting in the automatic mode.

[0011] Further, the PLC control layer is further configured with a fault protection program which automatically exits the automatic mode and clears the running timers when a device fault is detected.

[0012] Further, the PLC control layer further supports one-key switching with a time relay for controlling the frequency converter operation of the sludge pump and the sludge scraper.

[0013] Further, the SCADA monitoring layer provides independent sludge pump control interface and sludge scraper control interface.

[0014] Further, the typical running time parameter of the sludge pump in the time parameter setting unit is set to 30 minutes, the stop time parameter is set to 90 minutes; the typical running time parameter of the sludge scraper is set to 20 minutes, the stop time parameter is set to 100 minutes; and the delay time parameter is typically set to 5 minutes.

[0015] A timing program control method of a high-efficiency sedimentation tank, comprising the following steps:

[0016] S1. Set the time parameters and delay parameters of the sludge pump and the sludge scraper through the human-computer interaction interface of the SCADA monitoring layer respectively;

[0017] S2. The PLC control layer generates timing control instructions according to the time parameters and delay parameters set in step S1, and the device execution layer executes the automatic timing program and the linkage program according to the timing control instructions;

[0018] S3. When a device is abnormal, the PLC control layer starts the fault protection program, automatically exits the automatic mode and clears the running timers, and restarts the automatic mode after troubleshooting.

[0019] The above technical scheme has the following advantages:

[0020] 1. The present application provides a timing program control system of a high-efficiency sedimentation tank, which adopts the timing control logic of linkage of the PLC control layer and the SCADA monitoring layer to realize the automatic timing and delay linkage of the sludge pump and the sludge scraper accurately, prolong the sludge sedimentation time, improve the sludge content significantly, and completely solve the problem of sludge pump cleaning water in the traditional operation mode.

[0021] 2. The application provides a timing program control system of a high-efficiency sedimentation tank, which cancels 24-hour uninterrupted operation through setting automatic timing program and linkage program, greatly reduces power consumption and operation cost, prolongs equipment maintenance period, reduces shutdown maintenance frequency, and has prominent effects of reducing cost and increasing efficiency.

[0022] 3. The application provides a timing program control system of a high-efficiency sedimentation tank, which supports flexible switching of two control modes of PLC control and time relay, realizes parameter visual setting and state real-time monitoring of a SCADA monitoring layer, and is convenient to operate and accurate in management and control.

[0023] 4. The application provides a timing program control system of a high-efficiency sedimentation tank, which sets a fault protection program in a PLC control layer, responds to equipment abnormalities in time, avoids fault expansion, and guarantees system operation stability and safety. BRIEF DESCRIPTION OF DRAWINGS

[0024] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings.

[0025] Figure 1 is a screenshot of a human-computer interaction interface of a sludge pump of the high-efficiency sedimentation tank.

[0026] Figure 2 is a screenshot of a human-computer interaction interface of a mud scraper of the high-efficiency sedimentation tank.

[0027] Figure 3 is a control logic diagram of automatic timing program and linkage program of the sludge pump and the mud scraper. DETAILED DESCRIPTION

[0028] The technical solutions of the application are specifically described below in combination with the drawings of the specification. The detailed features and advantages of the application are described in detail in the specific embodiments, and the content is sufficient to enable any person skilled in the art to understand the technical content of the application and implement it. According to the specification, claims and drawings disclosed in the specification, those skilled in the art can easily understand the related purposes and advantages of the application.

[0029] A timing program control system of a high-efficiency sedimentation tank, comprising: a SCADA monitoring layer configured to provide a human-computer interaction interface, the human-computer interaction interface comprising a mode switching unit for switching between automatic and manual modes, a time parameter setting unit for setting running time and stopping time of a sludge pump and a mud scraper, and a delay parameter setting unit for setting a start interval of the sludge pump and the mud scraper. Figure 1 、 Figure 2 as shown in Figure 1 shows a screenshot of a human-computer interaction interface of a sludge pump of the high-efficiency sedimentation tank. Figure 2A screenshot of the man-machine interface of the mud scraper of the high-efficiency sedimentation tank is shown. Through the man-machine interface of the SCADA monitoring layer Figure 1 and Figure 2 , the automatic running time and the automatic stopping time can be set. The control buttons include start, stop and mode switching buttons of automatic or manual mode. The states include remote, running, fault and timeout states. The SCADA monitoring layer provides independent sludge pump control interface and mud scraper control interface.

[0030] The PLC control layer is in communication connection with the SCADA monitoring layer, and is configured to run an automatic timing program and a linkage program to generate a timing control instruction according to time parameters and delay parameters; wherein the automatic timing program in the PLC control layer is configured to set independent running timers and stopping timers for the sludge pump and the mud scraper respectively to realize periodic start-stop control. The linkage program in the PLC control layer is configured to trigger the start of the mud scraper when the running time of the sludge pump reaches the value set by the delay parameters in the automatic mode.

[0031] In addition, the PLC control layer is also configured with a fault protection program, which automatically exits the automatic mode and clears the running timers when a device fault is detected, and the automatic mode can be restarted after troubleshooting. The PLC control layer also supports one-key switching with a time relay, and the two modes are respectively used to control the frequency converters of the sludge pump and the mud scraper.

[0032] The device execution layer is connected with the PLC control layer, and includes sludge pump frequency converters and mud scraper frequency converters controlled by the timing control instruction.

[0033] A timing program control method of a high-efficiency sedimentation tank, comprising the following steps:

[0034] S1. Set the time parameters and delay parameters of the sludge pump and the mud scraper through the man-machine interface of the SCADA monitoring layer respectively;

[0035] S2. The PLC control layer generates a timing control instruction according to the time parameters and delay parameters set in step S1, and the device execution layer executes the automatic timing program and the linkage program according to the timing control instruction;

[0036] S3. When the device is abnormal, the PLC control layer starts the fault protection program, automatically exits the automatic mode and clears the running timers, and restarts the automatic mode after troubleshooting.

[0037] The control logic diagram of the automatic timing program and the linkage program of the sludge pump and the mud scraper is specifically as shown in Figure 3As shown, the automatic and manual mode switching button is displayed on the human-computer interaction interface of the SCADA monitoring layer. In the automatic sludge discharge mode, the operation personnel sets the sludge pump operation time and stop time, and sets the sludge scraper operation time and stop time at the same time. The PLC control layer controls the sludge pump and the sludge scraper according to the set time parameters and the linkage conditions. The specific control logic is as follows:

[0038] 1. Sludge pump automatic operation process: The automatic mode is added to the existing remote control program, and a timer is added to the program corresponding to the automatic operation of the sludge pump. The running time and the stop time are counted separately. In the remote and automatic mode, the sludge pump will be automatically started and stopped according to the program timer trigger. It will be automatically started according to the running time setting, and it will be stopped when the running time is greater than or equal to the set time. At the same time, the stop timer is triggered to count down. When the stop timer is greater than or equal to the set time, the sludge pump will be started again. During the automatic operation mode, the program will add protection measures. When the sludge pump appears remote exception or fault condition, the automatic operation will stop, and the timer that has worked will be cleared. After the fault is eliminated, the automatic mode is restarted.

[0039] 2. Automatic operation process of sludge scraper: The automatic mode is added to the existing remote control program, and a timer is added to the program corresponding to the automatic operation of the sludge scraper. The running time and the stop time are counted separately. In the remote and automatic mode, the sludge scraper will be automatically started and stopped according to the program timer trigger, and will be operated in linkage with the sludge pump. The starting condition of the sludge scraper in the automatic mode is to start the sludge scraper when the automatic operation time of the corresponding sludge pump is equal to five minutes. After the sludge scraper is started, it will be automatically operated according to the set running time timer. When the running time is greater than or equal to the set time, it will be stopped. At the same time, the stop timer is triggered to count down. When the stop timer is greater than or equal to the set time, the sludge scraper will be started again. During the automatic operation mode, the program will add protection measures. When the sludge scraper appears remote exception or fault condition, the automatic operation will stop, and the timer that has worked will be cleared. After the fault is eliminated, the automatic mode is restarted.

[0040] The specific use method is as follows: when preparing to use the automatic sludge discharge, the operator needs to select the corresponding sludge pump control pop-up box in the SCADA monitoring layer human-computer interaction interface of the control room Figure 1 As shown: input the device automatic running time and stop time parameters in the automatic running time interface, and set the sludge pump delay linkage high-efficiency sludge scraper delay time setting. After the parameter setting is completed, the sludge pump is switched to the automatic mode to start automatic operation. Similarly Figure 2The same automatic running time and stopping time parameter setting also needs to be carried out in the mud scraper control interface, and the running mode is switched to the automatic mode. Among them, the typical running time parameter setting of the sludge pump in the time parameter setting unit is 30 minutes, and the stopping time parameter setting is 90 minutes; the typical running time parameter setting of the mud scraper is 20 minutes, and the stopping time parameter setting is 100 minutes; the delay time parameter is typically set to 5 minutes to restart running, so as to achieve the time sequence of the sludge discharge effect, which can be set on the man-machine interface. Figure 2 、 Figure 3 The start and stop of the high-efficiency sedimentation tank mud scraper are controlled according to the time sequence of the sludge pump running state. The control increases the sludge settling time, increases the sludge content of the sludge discharge, shortens the maintenance cycle, and saves the operation and treatment cost. According to the need of the sewage treatment plant, the high-efficiency sedimentation tank is started and stopped to control the frequency converter running and stopping of the sludge pump and the mud scraper, and it can also be switched to the time relay control of the frequency converter running of the sludge pump and the mud scraper.

[0041] The time sequence program control system of the high-efficiency sedimentation tank can effectively improve the design defects, solve the design defects that the sludge does not have time to settle, the sludge pump discharges a large amount of clean water, and the long-time sludge discharge increases the power consumption and operation and treatment cost. The time sequence program control system of the high-efficiency sedimentation tank cancels the long-time running of the sludge pump and the mud scraper, controls the running according to the time sequence of the sludge pump and the mud scraper, realizes the effect of high-efficiency sludge discharge of the high-efficiency sedimentation tank, and to a certain extent, also reduces the power consumption and operation and treatment cost. The running and maintenance cycle of the equipment is increased, the downtime maintenance time is reduced, and the effect of reducing cost and increasing efficiency is achieved.

[0042] Finally, it should be pointed out that although the present application has been described with reference to the current specific embodiments, those skilled in the art should realize that the above embodiments are only used to illustrate the present application, and are not used as a limitation of the present application, and various equivalent changes or replacements can be made without departing from the concept of the present application, therefore, any changes or modifications of the above embodiments within the scope of the spirit of the present application will fall within the scope of the claims of the present application.

Claims

1. A time sequence program control system for a high efficiency sedimentation tank, characterized by, The application relates to a sludge pump and a scraper, and relates to a sludge pump and scraper control system. The application comprises: A SCADA monitoring layer configured to provide a human-computer interaction interface, which comprises a mode switching unit for switching between automatic and manual modes, a time parameter setting unit for setting sludge pump and scraper running time and stopping time, and a delay parameter setting unit for setting sludge pump and scraper starting interval; A PLC control layer in communication connection with the SCADA monitoring layer, configured to run an automatic timing program and a linkage program to generate time sequence control instructions according to time parameters and delay parameters; 2. The time sequence control system of a high efficiency sedimentation tank according to claim 1, wherein, A device execution layer connected with the PLC control layer, comprising a sludge pump frequency converter and a scraper frequency converter controlled by the time sequence control instructions.

3. The timing sequence control system of a high efficiency sedimentation tank according to claim 1 or 2, characterized in that, The automatic timing program in the PLC control layer is configured to set independent running timers and stopping timers for sludge pumps and scrapers respectively to realize periodic start-stop control.

4. The time sequence control system of a high efficiency sedimentation tank according to claim 1, wherein, The linkage program in the PLC control layer is configured to trigger the scraper to start when the sludge pump running time reaches the value set by the delay parameter in the automatic mode.

5. The time sequence control system of a high efficiency sedimentation tank according to claim 1, wherein, The PLC control layer is further configured with a fault protection program which automatically exits the automatic mode and clears the running timers when a device fault is detected.

6. The timing sequence control system for a high efficiency sedimentation basin according to claim 1, wherein, The PLC control layer further supports one-key switching with a time relay for controlling the frequency converter running of the sludge pump and the scraper.

7. The timing sequence control system for a high efficiency sedimentation basin according to claim 1, wherein, The SCADA monitoring layer provides independent sludge pump control interface and scraper control interface.

8. A time sequence control method of a high efficiency sedimentation tank, characterized by, Typical sludge pump running time parameter in the time parameter setting unit is set to 30 minutes, and stopping time parameter is set to 90 minutes; typical scraper running time parameter is set to 20 minutes, and stopping time parameter is set to 100 minutes; and delay time parameter is typically set to 5 minutes. The application comprises the following steps: S1. Setting time parameters and delay parameters of sludge pumps and scrapers through the human-computer interaction interface of the SCADA monitoring layer; S2. The PLC control layer generates time sequence control instructions according to the time parameters and delay parameters set in step S1, and the device execution layer executes the automatic timing program and the linkage program according to the time sequence control instructions; S3. When a device is abnormal, the PLC control layer starts the fault protection program, automatically exits the automatic mode and clears the running timers, and restarts the automatic mode after the fault is eliminated.

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