Time timer controls cems system purging and automatic calibration device and method

Abstract

The application discloses a time timer control CEMS system purging and automatic calibration device and method, the device includes: time timer, programmable logic controller PLC and flue gas emission continuous monitoring system CEMS, the time timer is connected programmable logic controller PLC, for timing to programmable logic controller PLC sends time signal, programmable logic controller PLC connects flue gas emission continuous monitoring system CEMS, for according to the time signal of time timer control flue gas emission continuous monitoring system CEMS and carry out purging and automatic calibration;Realize through time controller start PLC logic to complete data retention and simultaneously to CEMS system purging and analyzer automatic calibration, increase the stability, reliability of system, ensure the environmental protection data monitoring stability, avoid the occurrence of environmental pollution event.

Description

Technical Field

[0001] This invention relates to the field of computer industrial control technology, and in particular to a timer-controlled CEMS system purging and automatic calibration device and method. Background Technology

[0002] In existing technologies, the time interval for triggering system backflushing and automatic calibration signals in the CEMS system is timed by a PLC. However, the timer within the PLC can only perform rough calculations and cannot achieve the accuracy of GPS time. Therefore, the system backflushing and automatic calibration time has always been flawed. Generally, the logic within the PLC is designed to trigger another purging after a one-hour timer following each purging cycle, repeating this logic while the PLC is continuously running. However, the hour duration of the PLC timer is offset, causing each purging cycle to deviate from the actual time. This results in abnormal system data display during the system backflushing and automatic calibration periods, leading to poor automatic adjustment quality of desulfurization and denitrification equipment, or even failure to automatically engage. Under normal circumstances, if changes occur in the unit system and data rises to excessive values, adjustments will be made accordingly to ensure that environmental data is controlled within the normal range. However, if the data rises to a high point before purging, the CEMS system's purging and calibration will cause environmental data to exceed the limits, resulting in environmental pollution. Summary of the Invention

[0003] The purpose of this invention is to provide a timer-controlled CEMS system purging and automatic calibration device and method, aiming to solve the environmental pollution problem caused by the inaccuracy of current timing.

[0004] This invention provides a timer-controlled CEMS system purging and automatic calibration device, comprising: a timer, a programmable logic controller (PLC), and a continuous emission monitoring system (CEMS). The timer is connected to the PLC and is used to periodically send time signals to the PLC. The PLC is connected to the CEMS and is used to control the CEMS to perform purging and automatic calibration according to the time signals sent by the timer.

[0005] After receiving the time signal sent by the timer, the PLC triggers the system purge signal, and the CEMS system enters the normal purge mode. After a certain period of time, the CEMS analyzer is triggered to perform automatic calibration. During the purge mode, analog data transmission stops.

[0006] This invention provides a method for controlling the purging and automatic calibration of a CEMS system using a timer, characterized in that...

[0007] S1. The programmable logic controller (PLC) receives a time signal sent by a timer.

[0008] S2. In response to the received time signal, the system purge signal is triggered and timing begins. The CEMS system enters normal purge mode, and analog data transmission stops.

[0009] S3. After the purging mode ends, the PLC triggers the CEMS analyzer to automatically calibrate using the automatic calibration signal.

[0010] By adopting the technical solution of this invention, the PLC logic is activated through a time controller to complete data retention and simultaneously purge the CEMS system and automatically calibrate the analyzer. After redesigning the PLC logic, the time for purging and automatically calibrating the CEMS system is reduced compared to the previous system, and the stability and reliability of the system are greatly increased, ensuring the stability of environmental data monitoring and preventing environmental pollution incidents.

[0011] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the timer-controlled CEMS system purging and automatic calibration device according to an embodiment of the present invention;

[0014] Figure 2 This is a flowchart of a timer-controlled CEMS system purging and automatic calibration method according to an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the trigger-purge mode logic design according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the delay logic design for the purge mode according to an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the logic design for controlling the end of the purging mode after the delay in an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the logic design for stopping analog data transmission after the purge mode starts in an embodiment of the present invention.

[0019] Figure 7 This is a schematic diagram of the delay-triggered automatic calibration signal logic design according to an embodiment of the present invention;

[0020] Figure 8 This is a schematic diagram of the triggering automatic calibration logic design in an embodiment of the present invention. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Device Examples

[0025] According to embodiments of the present invention, a timer-controlled CEMS system purging and automatic calibration device is provided. Figure 1This is a schematic diagram of the timer-controlled CEMS system purging and automatic calibration device according to an embodiment of the present invention. Figure 1 As shown, the timer-controlled CEMS system purging and automatic calibration device according to an embodiment of the present invention specifically includes: a timer 10, a programmable logic controller (PLC) 12, and a continuous emission monitoring system (CEMS) 14. The timer 10 is connected to the PLC 12 and is used to send time signals to the PLC 12 at regular intervals. The PLC 12 is connected to the CEMS 14 and is used to control the CEMS 14 to perform purging and automatic calibration according to the time signals sent by the timer 10.

[0026] After receiving the time signal sent by the timer 10, the PLC12 triggers the system purge signal, and the CEMS system 14 enters the normal purge mode. After a certain period of time, the CEMS analyzer is triggered to perform automatic calibration. During the purge mode, analog data transmission stops.

[0027] Method Implementation Examples

[0028] According to embodiments of the present invention, a method for controlling the purging and automatic calibration of a CEMS system using a timer is provided. Figure 2 This is a flowchart of a timer-controlled CEMS system purging and automatic calibration method according to an embodiment of the present invention, as shown below. Figure 2 As shown, the timer-controlled CEMS system purging and automatic calibration method according to an embodiment of the present invention specifically includes:

[0029] S1. The programmable logic controller (PLC) receives a time signal sent by a timer.

[0030] Specifically, the interval for the timer to send time signals is set according to the actual needs of the CEMS system.

[0031] S2. In response to the received time signal, the system purge signal is triggered and timing begins. The CEMS system enters normal purge mode, and analog data transmission stops.

[0032] Specifically, after the PLC triggers the purge signal, it purges the CEMS system. After the purge signal is triggered, the transmission of analog data stops. After the purge time ends, the time relay that controls the transmission of analog data is triggered.

[0033] S3. After the purging mode ends, the PLC triggers the CEMS analyzer to automatically calibrate using the automatic calibration signal;

[0034] Furthermore, after the analyzer's automatic calibration signal is triggered, it returns a "calibrating" signal, all logic in the PLC is paused, and normal operation resumes after the signal disappears. At this time, the analog signal is in a stopped transmission state until the delay time set by the time relay controlling the analog signal data transmission ends, at which point the analog signal data transmission resumes transmission. Specific implementation examples:

[0036] The timer is set to send a DO1 signal of type 3S pulse at 0 minutes past the hour. The 24V power supply is used to provide power for the automatic calibration signal of the CEMS analyzer. The logic inside the PLC is redesigned.

[0037] System purge:

[0038] After receiving the DO1 signal (I0.4), the PLC sets the purge mode trigger instruction V32.2 to 1 and resets the instruction V32.4, which controls all systems to resume normal operation, to 0. Figure 3 As shown, the system enters normal purging mode and begins purging. In the diagram, R inside the coil indicates that the output is 0 after being turned on, and S inside the coil indicates that the output is 1 after being turned on.

[0039] When V32.2 is set to 1, such as Figure 4 As shown, time relay T111 starts timing, and after 180 seconds, analog data transmission stops via M10.1. Figure 6 As shown, after V32.2 is reset to 0, there is a 420-second delay before data transmission returns to normal.

[0040] After a 180-second delay, T111 is set to 1, as follows. Figure 5 As shown, V32.2 is reset to 0, at which point the purge mode ends and data transmission remains stopped.

[0041] Automatic system calibration:

[0042] like Figure 7 As shown, when V32.2 is 1, V35.0 is turned on and set to 1. After V35.0 is 1, the time relay T120 starts timing, and after 180 seconds, it triggers the analyzer's automatic calibration signal Q2.7. Figure 8 Automatic calibration begins, taking approximately 3 minutes. After T120 reaches 1, T121 is triggered after a 0.4-second delay. T121 resets V35.0 to 0 and returns a "calibrating" signal to the PLC. Based on the "calibrating" signal returned after the analyzer's automatic calibration signal is triggered, the PLC pauses all logic within the PLC. This signal disappears after automatic calibration is completed, and the PLC resumes normal operation.

[0043] After the PLC resumes normal operation, data transmission remains stopped. After a 420-second delay following the end of the purging mode, the system fully returns to normal. The entire process takes 10 minutes.

[0044] By adopting the technical solution of this invention, the PLC logic is activated by the time controller to complete data retention and simultaneously purge the CEMS system and automatically calibrate the analyzer. After redesigning the PLC logic, the time for purging and automatically calibrating the CEMS system is reduced by 5-6 minutes compared to the previous system, and the stability and reliability of the system are greatly increased, ensuring the stability of environmental data monitoring and preventing environmental pollution incidents.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A timer-controlled CEMS system purging and automatic calibration device, characterized in that, include: The system includes a timer, a programmable logic controller (PLC), and a continuous emission monitoring system (CEMS). The timer is connected to the PLC and is used to send time signals to the PLC at regular intervals. The PLC is connected to the CEMS and is used to control the CEMS to perform purging and automatic calibration based on the time signals sent by the timer. After receiving the time signal from the timer, the PLC triggers the system purge signal, and the CEMS system enters normal purge mode. After a certain period of time, the CEMS analyzer is triggered to perform automatic calibration. During purge mode, analog data transmission stops. Specifically: Based on the "calibrating" signal returned after the analyzer's automatic calibration signal is triggered, all logic within the PLC is paused, and normal operation resumes after the signal disappears; after normal operation resumes, the analog data is controlled to return to normal after the delay time set after the purge mode ends.

2. The apparatus according to claim 1, characterized in that, The time signal type is a pulse signal.

3. The apparatus according to claim 1, characterized in that, The timer sends the time signal at a time that is required.

4. The apparatus according to claim 1, characterized in that, It includes a power supply module, which is specifically used to: provide power to the CEMS analyzer's automatic calibration signal using a 24V power supply.

5. A method for controlling the purging and automatic calibration of a CEMS system using a timer, characterized in that, S1. The programmable logic controller (PLC) receives a time signal sent by a timer. S2. In response to the received time signal, the system purge signal is triggered and timing begins. The CEMS system enters normal purge mode, and analog data transmission stops. S3. After the purging mode ends, the PLC triggers the CEMS analyzer to automatically calibrate using the automatic calibration signal.

6. The method according to claim 5, characterized in that, The method further includes: triggering a time relay after the purging mode ends, and resuming analog data transmission after the time relay finishes timing.

7. The method according to claim 5, characterized in that, The method further includes: after the analyzer's automatic calibration signal is triggered, it returns a "calibrating" signal, and all logic in the PLC is paused until the signal disappears and then normal operation resumes.

8. The method according to claim 5, characterized in that, The timer sends the time signal at a time that is required.

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