Demister capable of being washed wirelessly

Abstract

The utility model relates to the technical field of thermal power generation, in particular to a demister capable of being washed wirelessly. Comprising a PLC control box and a pneumatic valve. The PLC control box comprises a programmable logic controller and is used for receiving an instruction from a central control room and controlling the opening and closing actions of the pneumatic valve; the system also comprises a communication module which is based on the LoRa technology and is used for carrying out the communication with a central control room. The system further comprises an electromagnetic valve group which is directly controlled through a PLC (Programmable Logic Controller), so that accurate feeding and stopping of demister washing water are realized; a sensor is further arranged in the pneumatic valve and used for feeding back the opening and closing state of the pneumatic valve to the PLC in real time. According to the technical scheme, automatic flushing of the third-stage demister can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial automation, and particularly relates to a demister capable of wireless flushing. Background Art

[0002] In thermal power generation and similar industrial processes, as an important part of the flue gas purification system, the performance of the demister inside the absorption tower is directly related to the cleanliness of flue gas emissions, especially the control of dust particles. Traditionally, the demisters in absorption towers are mostly arranged in multiple stages, such as a structure of a first-stage tube type plus a third-stage roof type demister. Process water flushing is used to remove the dust and particles attached to the surface of the demister to ensure that the flue gas emissions meet the environmental protection standards.

[0003] However, there are some significant problems in the demister flushing system in the prior art. Specifically, according to the regulations, the upper and lower parts of the first-stage and second-stage demisters of the demister and the lower part of the third-stage demister have usually been remotely automated based on wirelines, and the flushing process can be completed through remote operation of the DCS (Distributed Control System), which greatly improves the operation efficiency and safety. However, due to cost considerations (for example, if the upper part of the third-stage demister is remotely controlled by wirelines, the cost will increase by about 1 / 3), the flushing of the upper part of most existing third-stage demisters still relies on manual operation, that is, the operating personnel need to climb to the top of the absorption tower in person to manually open the flushing valve, which not only increases the labor intensity and safety risks of the operating personnel, but also significantly prolongs the response time. In an emergency where the dust rises rapidly, such as in the last half hour of each hour, due to the lag of manual response (in actual work, the response time for the operating personnel to rush from the centralized control room to the demister to open the flushing locally takes about 10 minutes), it is very likely that the hourly average value of dust exceeds the standard, thus failing to meet the strict environmental protection emission requirements.

[0004] In addition, the way of manual regular flushing is not only time-consuming and laborious, but also inefficient. The operating personnel need to carry out flushing operations every day, and the single operation takes about 1 hour. In case of special circumstances, the flushing frequency and time need to be increased, further increasing the work burden of the operating personnel. This flushing method relying on manual operation is particularly inconvenient and backward in a modern and automated industrial environment. Summary of the Utility Model

[0005] The purpose of the utility model is to propose a demister capable of wireless flushing, and this technical solution can achieve automatic flushing of the upper part of the third-stage demister at low cost.

[0006] To achieve the above purpose, the embodiments of the present disclosure provide a demister capable of wireless flushing, including a PLC control box and a pneumatic valve;

[0007] The PLC control box includes a programmable logic controller, which is used to receive instructions from the centralized control room and control the opening and closing actions of pneumatic valves; it also includes a communication module, based on LoRa technology, for communicating with the centralized control room.

[0008] The pneumatic valve is provided with a solenoid valve group, which is directly controlled by the PLC to achieve precise dosing and stopping of the demister flushing water; the pneumatic valve is also provided with a solenoid valve group for real-time feedback of the opening and closing state of the pneumatic valve to the PLC controller.

[0009] Beneficial effects of the basic solution: Through wireless communication technology, remote control and status feedback are realized, making the flushing process of the demister more flexible and responsive, which helps to ensure that flue gas emissions meet environmental protection standards and meet the requirements of modern and automated industrial environments.

[0010] Using wireless technology instead of wired cables avoids high-altitude operations, reduces work safety risks, and reduces the costs of scaffolding erection, DCS card hardware, and cables. Specifically, Lora wireless technology is selected. Due to its mature technology, low hardware cost, strong anti-interference ability, and the fact that users can deploy the network without paying expensive license fees or completely free of charge, the existing demister tower can be transformed at a low deployment cost, with strong anti-interference ability and long communication distance, improving the reliability of wireless control. And Lora wireless technology can also support encryption, and the physical layer can demodulate at 20dB below the noise, making it difficult for ordinary devices to detect and interfere with LoRa signals, enhancing the security of communication and avoiding safety problems in power plants.

[0011] Wireless remote full-automatic operation can be achieved in the centralized control room, which can reduce the labor intensity of operators, achieve intelligent operation. The operators can also reasonably and flexibly adjust the flushing time, flushing interval time, cycle time, flushing times, etc. according to the load situation and the working conditions of the absorption tower, and can also flexibly operate a single valve as needed.

[0012] As an implementable preferred solution, the PLC control box further includes a security module. Inside the PLC control box, there are a card slot, a double-ferrule needle valve, a pressure regulating valve, and a quick-connect tee; the card slot is used to install each module, the double-ferrule needle valve can block the gas source for convenient maintenance work; the pressure regulating valve can control the gas supply speed; the quick-connect tee can remove impurities in the solenoid valve group.

[0013] As an implementable preferred solution, the communication distance between the communication module and the centralized control room is extended by adding a relay station.

[0014] As an implementable preferred solution, the solenoid valve group is made of highly corrosion-resistant materials.

[0015] As an implementable preferred solution, the PLC control box further includes a diagnostic alarm module for sending an alarm signal to the centralized control room.

[0016] As an implementable preferred solution, the PLC control box further includes an air purification and pressure regulating component for providing a clean and stable compressed air source for the pneumatic valve.

[0017] As an implementable preferred solution, the PLC control box further includes a single-operation button and an indicator light, both of which are installed outside the PLC control box. The single-operation button is used as a backup operation means to manually control the opening and closing of the solenoid valve in case of emergency, and the indicator light is used to display the current state of the valve.

[0018] As an implementable preferred solution, a valve position feedback device is installed in the pneumatic valve to output the valve state in the form of a switch signal.

[0019] As an implementable preferred solution, it further includes a display module arranged in the centralized control room for visual control of the demister.

[0020] As an implementable preferred solution, it further includes a collection module for collecting the dust concentration and sending the signal to the PLC control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal layout of the solenoid valve group of the PLC control box.

[0022] Figure 2 It is a schematic diagram of the external control and display part of the PLC control box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the technical solutions and their advantages of this application clearer, the technical solutions of the present invention will be further described in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only partial embodiments of the present invention, which are only used to explain this application and not to limit this application. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated, and they can be combined with each other to achieve better technical effects. The same reference numerals in the drawings of the following embodiments represent the same features or components and can be applied to different embodiments.

[0024] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs.

[0025] The present invention will be further described in detail below with reference to the drawings:

[0026] Reference numerals: card slot 1, double ferrule needle valve 2, pressure regulating valve 3, quick-connect tee 4, solenoid valve group 5, air source interface 6.

[0027] Embodiment 1

[0028] A demister capable of wireless flushing, comprising: a PLC control box and a pneumatic valve. In one embodiment, the PLC control box model is SPIC-SQRD-WXCX-V1.0-KZX, and the pneumatic valve model is DN100.

[0029] Referring to Figure 1 , inside the PLC control box, there are a card slot 1, a double ferrule needle valve 2, a pressure regulating valve 3, a quick-connect tee 4, etc. The card slot is used to install each module. The double ferrule needle valve 5 can block the air source to facilitate maintenance and other work. The pressure regulating valve can control the air supply speed. The quick-connect tee can remove impurities such as moisture and oil from the solenoid valve group 5. Specifically, it includes:

[0030] A programmable logic controller (PLC), as the core control unit of the system, is used to receive instructions from the centralized control room and control the opening and closing actions of the pneumatic valve.

[0031] A communication module, supporting the LoRa 470 - 928 MHz frequency band, is used for stable communication with the centralized control room. The communication module has the characteristics of high sensitivity and low power consumption, and can adapt to complex industrial environments. The communication module is integrated with a wireless transceiver device, responsible for wireless data transmission and reception, ensuring real-time data transmission and reception. Using LoRa Internet of Things private wireless transmission technology can ensure the stability and real-time of data transmission. After actual measurement, within a range of 2 kilometers (including occlusion), by optimizing the antenna design and relay station deployment, long-distance and high-reliability data transmission can be achieved. When the direct communication distance is limited, the communication distance can also be extended by adding relay stations to ensure the continuity of data transmission.

[0032] A security module is used to perform AES_128 encryption export on the root keys generated by the LoRa network layer and application transmission layer random numbers to enhance the security of data transmission. The encryption key is replaced regularly to prevent being cracked. At the same time, a security dongle is built in as a hardware-level security protection measure to prevent illegal copying and tampering of the control program.

[0033] A diagnostic alarm module is used to send an alarm signal to the centralized control room when data transmission anomalies or equipment failures are found, facilitating timely handling of abnormal situations.

[0034] The solenoid valve group 5 is directly controlled by the PLC to achieve precise dosing and stopping of the flushing water of the demister. The solenoid valve group 5 is made of highly corrosion-resistant materials and can adapt to harsh working environments.

[0035] The air purification and pressure regulating component is used to provide a clean and stable compressed air source for the pneumatic valve, ensuring the normal operation of the pneumatic valve. This helps to avoid moisture, oil, or impurities in the compressed air, which could cause wear, blockage, or corrosion of the internal components of the valve, affecting its normal function and service life. At the same time, it improves the control accuracy.

[0036] The single-operation button is installed outside the PLC control box and is used as a backup operation means to manually control the opening and closing of the solenoid valve in case of an emergency. It also includes an indicator light installed outside the PLC control box. The single-operation button is used as a backup operation means to manually control the opening / closing of the solenoid valve in an emergency, and the indicator light is used to display the current state of the valve. The single-operation button is directly connected to the solenoid valve through an electrical circuit. When manual operation is required, pressing the button sends a signal to the solenoid valve to open or close it. Refer to Figure 2 , the first row and the fourth row from top to bottom are single-operation buttons, and the rest are status indicator lights for easy viewing of the status of each valve; the single-operation buttons in the first row can switch between remote / local control, and the single-operation buttons in the fourth row can locally control the opening and closing of the valve.

[0037] The pneumatic valve is used to achieve remote control and status feedback. The pneumatic valve adopts high-precision positioning technology to ensure the accuracy of the opening and closing actions. The opening and closing state of the pneumatic valve is real-time fed back to the PLC controller through an internal sensor, providing data support for system monitoring and fault troubleshooting. In one embodiment, a valve position feedback device can be installed in the pneumatic valve to output the valve state in the form of a switch signal.

[0038] It also includes a display module installed in the centralized control room for visual control of the demister, which can be used for online monitoring of the valve and can flexibly set the flushing time, flushing interval time, and flushing cycle according to the actual situation. In one embodiment, the model of the display module is SPIC-SQRD-WXCX-V1.0-PAD.

[0039] The usage method is as follows:

[0040] Install the PLC control box in a suitable location to ensure good ventilation and easy maintenance.

[0041] Lay stainless steel gas supply pipes from the gas source interface to each pneumatic valve. The gas supply pipes adopt seamless welding technology to prevent air leakage. At the same time, necessary valves and pressure gauges are set on the gas supply pipes for pressure adjustment and monitoring.

[0042] Lead out a 24V power supply from the local original local solenoid valve box to the PLC control box to supply power to the PLC and the wireless transceiver device.

[0043] Lay short-distance signal cables to each actuator (pneumatic valve) to transmit the status signal of the actuator to the PLC wireless transmission integrated control box.

[0044] The air source of the control box is taken from the spare air source interface of the local solenoid valve box to ensure stable air supply for pneumatic valves.

[0045] Carry out system debugging and configuration, specifically including:

[0046] Program the PLC and set the control logic and parameters of the solenoid valve group.

[0047] Configure LoRa wireless digital pair transmission devices, set parameters such as communication frequency and encryption key to ensure the security and stability of data transmission.

[0048] Perform configuration settings on the display module in the centralized control room to achieve the fully automatic sequential control flushing function. Set parameters such as flushing time, flushing interval time, and flushing cycle, and can be flexibly adjusted according to actual needs.

[0049] Conduct a comprehensive test on the entire system, including the individual operation of single valves, the interlock control of multiple valves, fault alarm and emergency handling, etc., to ensure the stable operation of the system.

[0050] Embodiment 2

[0051] It also includes a collection module. The collection module is used to collect and analyze the rising time and dust amount (dust concentration) of dust, and send the signal to the PLC control box. In one embodiment, the collection module is an image collection component, which collects dust images and then analyzes the rising time and dust amount of dust through images. In another embodiment, the collection module can adopt a dust concentration sensor with the model number PM3003Q to real-time monitor the dust concentration in the air, output through a digital interface, analyze the change trend of the dust concentration, and calculate the rising time of dust according to the change rate of the dust concentration. For example, the faster the growth change rate of the dust concentration, the faster the corresponding dust rising time.

[0052] The PLC control box is used to control the flushing time and flushing times of dust according to the dust amount, and control the flushing interval time and cycle time according to the rising time of dust.

[0053] Through the integration of the collection module, the flushing strategy can be automatically adjusted according to the real-time monitored dust concentration, further improving the intelligent level of the system and the accuracy of operation.

[0054] The above content is only an embodiment of the present utility model. Specific structures and common knowledge such as characteristics well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the filing date or the priority date, are able to know all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given by this application, complete and implement this solution in combination with their own abilities. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A wireless flushable defogger, characterized in that: Including PLC control box and pneumatic valve; The PLC control box includes a programmable logic controller for receiving instructions from the control room and controlling the opening and closing actions of the pneumatic valves; a communication module based on LoRa technology for communicating with the control room; and a solenoid valve group, which is directly controlled by the PLC to achieve accurate delivery and stopping of defogger flushing water; The pneumatic valve is also provided with a sensor for feeding back the switch status of the pneumatic valve to the PLC controller in real time.

2. A wireless flushable demister according to claim 1, characterized in that: The PLC control box is internally provided with a card slot, a double-card sleeve needle valve, a pressure regulating valve and a quick-insert tee; the card slot is used to install various modules, the double-card sleeve needle valve can block the gas source, and it is convenient for maintenance work; the pressure regulating valve can control the speed of gas supply; the quick-insert tee can remove impurities in the solenoid valve group.

3. The wireless flushable demister according to claim 1, characterized in that: The communication distance between the communication module and the control room is extended by adding relay stations.

4. The wireless flushable demister according to claim 1, characterized in that: The solenoid valve group is made of highly corrosion-resistant materials.

5. The wireless flushable demister according to claim 1, characterized in that: The PLC control box also includes a diagnostic alarm module for sending an alarm signal to the centralized control room.

6. The wireless flushable demister according to claim 1, characterized in that: The PLC control box also includes an air purification and pressure regulating component for providing a clean and stable compressed air source for the pneumatic valve.

7. The wireless flushable demister according to claim 1, characterized in that: The PLC control box also includes a single operation button and an indicator light, both of which are installed outside the PLC control box. The single operation button is used as a backup operation means to manually control the opening and closing of the solenoid valve in an emergency, and the indicator light is used to display the current status of the valve.

8. The wireless flushable demister according to claim 1, characterized in that: The sensor installed in the pneumatic valve includes a valve position feedback device, which is used to output the valve state in the form of a switch signal.

9. The wireless flushable demister according to claim 1, characterized in that: It also includes a display module, which is arranged in the control room and is used for visual control of the defogger.

10. The wireless flushable demister according to claim 1, characterized in that: It also includes a collection module for collecting dust concentration and sending a signal to a PLC control box.

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