Monitoring cloud platform based on PLC system for papermaking waste gas treatment

Abstract

The invention discloses a PLC-system-based monitoring cloud platform for papermaking waste gas treatment. The PLC-system-based monitoring cloud platform comprises a user side, a monitoring cloud platform body, an HMI touch screen and a PLC control system. The PLC control system transmits collected operation parameters of the papermaking waste gas treatment equipment to the HMI touch screen, the HMI touch screen displays received data in an image mode and uploads the data to the monitoring cloud platform, a user side can check the operation state of the equipment through the monitoring cloud platform and sends an operation instruction, then the HMI touch screen sends the received operation instruction to the PLC control unit, and the PLC control unit controls the PLC control system to control the papermaking waste gas treatment equipment. And remote control of the processing equipment is realized. The waste gas treatment equipment is remotely monitored and controlled through the monitoring cloud platform, all-directional real-time monitoring and intelligent management of the waste gas treatment equipment are realized, the actual efficiency of the treatment equipment is fully played, the treatment efficiency and supervision level of waste gas are effectively improved, the timeliness and effectiveness of equipment operation and maintenance are ensured, human resources are saved, and the supervision cost is reduced.

Description

Technical Field

[0001] The present invention relates to a monitoring cloud platform, and in particular to a monitoring cloud platform based on a PLC system for papermaking waste gas treatment, belonging to the field of environmental protection technology. Background Art

[0002] As my country's requirements for industrial waste gas emissions become increasingly stringent, more and more environmental problems are exposed to people, especially in the papermaking industry. The papermaking process produces large-volume, high-temperature, high-humidity and foul-smelling waste gas. When the ambient temperature is low, a large amount of white smoke will be produced, forming visual pollution. If the waste gas is not effectively treated, it will affect the health of workshop workers and surrounding residents. To improve the efficiency and supervision level of waste gas treatment and give full play to the actual effectiveness of the treatment device, it is necessary to promote it comprehensively from multiple aspects such as the optimization of the treatment process and the upgrading and transformation of the treatment equipment.

[0003] The invention patent "Papermaking waste gas deodorization, dewhitening and waste heat utilization system" (China Patent Authorization Announcement No. CN 208088010 U) discloses a papermaking waste gas deodorization, dewhitening and waste heat utilization system, which optimizes the treatment process and adopts the "bottom heat exchange + spray deodorization + demisting + reheating" process. The waste gas is deodorized and cooled by the spray heat exchange tower, and the "colored smoke plume" is eliminated by the automatic start and stop reheating section system based on the waste gas outlet temperature. However, there are still some shortcomings in the actual application of this equipment: (1) Before each operation of the treatment equipment, it is necessary to inspect the switch status of each valve and the liquid level of each water tank on site. When the equipment stops running, the operator is also required to go to the site to manually stop it, which is inconvenient. (2) Most papermaking waste gas treatment equipment needs to run 24 hours a day. During the operation, regular inspections are required to ensure the normal operation of the treatment equipment, which consumes a lot of manpower. (3) During the operation of the treatment equipment, when a fault occurs at a certain point, the operator may only discover it during inspection, resulting in untimely discovery of the fault, which may affect the normal operation of the equipment, shorten the service life of the equipment, and affect the efficiency of waste gas treatment. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a monitoring cloud platform based on a PLC system for papermaking waste gas treatment. The operating status of the waste gas treatment equipment is remotely monitored by the monitoring cloud platform and the equipment operating status is remotely controlled by the PLC system, thereby realizing all-round real-time monitoring and intelligent management of the waste gas treatment device, ensuring the timeliness and effectiveness of equipment operation and maintenance, saving human resources, and reducing supervision costs.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a monitoring cloud platform based on a PLC system for papermaking waste gas treatment, including a user terminal, a monitoring cloud platform, an HMI touch screen, a PLC control system, a data acquisition unit, a data storage unit, a fault alarm unit, a data transmission unit, a PLC control unit, a dosing system level sensor, a spray liquid level sensor, a spray liquid pH sensor, an exhaust gas inlet temperature and humidity sensor, an exhaust gas outlet temperature and humidity sensor, an external environment temperature and humidity sensor, a spray liquid flow control module, a reheat section heat source flow control module, a fan control module, and a dosing system control module.

[0008] Preferably, the user terminal can be a computer client or a mobile phone APP.

[0009] Preferably, the monitoring cloud platform collects, organizes, calculates and analyzes the uploaded equipment operation data, derives corresponding operation instructions and sends them to the HMI touch screen, and operation instructions can also be manually input.

[0010] Preferably, the HMI touch screen displays the data transmitted by the PLC control system in a graphical manner on site, and simultaneously uploads the data to the monitoring cloud platform and receives operation instructions fed back by the monitoring cloud platform.

[0011] Preferably, the data acquisition unit collects data from multiple sensors such as an exhaust gas inlet temperature and humidity sensor, an exhaust gas outlet temperature and humidity sensor, and an external environment temperature and humidity sensor.

[0012] Preferably, the storage unit is used to automatically generate and save graphs of data generated during the operation of the exhaust gas treatment system.

[0013] Preferably, the fault alarm unit is used to display an alarm message and the cause of the alarm on the HMI touch screen and the monitoring cloud platform when a problem or fault occurs in a module or a point during the operation of the exhaust gas treatment equipment.

[0014] Preferably, the data transmission unit uploads the data collected by the data collection unit to the HMI touch screen, and transmits the operation instructions fed back by the HMI touch screen to the PLC control unit.

[0015] Preferably, the PLC control unit receives operation instructions sent by the HMI touch screen to control modules such as the spray liquid flow, reheating section heat source flow, fan, and dosing system.

[0016] Preferably, the HMI touch screen is connected to the PLC control system downwardly through wired signals, and is connected to the monitoring cloud platform upwardly through wireless signals.

[0017] Preferably, each valve of the exhaust gas treatment equipment is an electric valve, which can be remotely controlled.

[0018] Preferably, the monitoring cloud platform can remotely control the start and stop of each point of the exhaust gas treatment equipment, and can also control the start and stop of each point of the exhaust gas treatment equipment on site through the HMI touch screen.

[0019] Preferably, through the linkage of the user terminal, monitoring cloud platform, HMI touch screen and PLC control system, the operators can operate intuitively and easily through the touch screen, and remote monitoring and control can be carried out through the monitoring cloud platform, realizing all-round real-time monitoring and intelligent management of the exhaust gas treatment device, ensuring the timeliness and effectiveness of equipment operation and maintenance, saving human resources and reducing supervision costs.

[0020] (III) Beneficial effects

[0021] The present invention provides a monitoring cloud platform based on a PLC system for papermaking waste gas treatment. It has the following beneficial effects:

[0022] (1) This PLC-based monitoring cloud platform for papermaking waste gas treatment simplifies the user operation process, saves human resources, and reduces regulatory costs.

[0023] (2) This monitoring cloud platform based on the PLC system for papermaking waste gas treatment realizes all-round real-time monitoring and intelligent management of papermaking waste gas treatment equipment, giving full play to the actual efficiency of the treatment equipment.

[0024] (3) This monitoring cloud platform based on the PLC system for papermaking waste gas treatment ensures the timeliness and effectiveness of equipment operation and maintenance, and effectively improves the waste gas treatment efficiency and supervision level. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0027] like Figure 1As shown, a monitoring cloud platform based on a PLC system for papermaking waste gas treatment includes: a user end, a monitoring cloud platform, an HMI touch screen, a PLC control system, a data acquisition unit, a storage unit, a data transmission unit, a PLC control unit, an exhaust gas inlet temperature and humidity sensor, an exhaust gas outlet temperature and humidity sensor, an external environment temperature and humidity sensor, a spray liquid flow control module, a reheating section heat source flow control module, a fan control module, and a dosing system control module. The monitoring cloud platform is connected to the HMI touch screen through a wireless signal, and the HMI touch screen is connected to the PLC control system through a wired signal. The PLC control system transmits the collected equipment operating parameters to the HMI touch screen, and the HMI touch screen displays the received data in an image and uploads it to the monitoring cloud platform. The user end can view the equipment operating status and send operation instructions through the monitoring cloud platform, and then the HMI touch screen sends the received operation instructions to the PLC control unit to realize remote control of the running equipment.

[0028] In order to facilitate user operation, save human resources and reduce supervision costs, operators can remotely control the start and stop of the exhaust gas treatment equipment through the monitoring cloud platform, or through the on-site HMI touch screen. The user end can be a computer client or a mobile phone APP.

[0029] In order to achieve all-round real-time monitoring and intelligent management of the exhaust gas treatment device, the data acquisition unit collects data from multiple sensors such as the exhaust gas inlet temperature and humidity sensor, the exhaust gas outlet temperature and humidity sensor, the external environment temperature and humidity sensor, the pH sensor, the liquid level sensor, etc., and transmits the collected data to the HMI touch screen. The HMI touch screen displays the data transmitted by the PLC control system in an image, and uploads the data to the monitoring cloud platform. The monitoring cloud platform collects, organizes, stores, calculates and analyzes the real-time data of the exhaust gas treatment equipment uploaded by the HMI touch screen, and then feeds back the instructions to the HMI touch screen. The HMI touch screen then transmits the feedback instructions to the PLC control unit. The PLC control unit receives the operation instructions sent by the HMI touch screen to control modules such as the spray liquid flow, the reheat section heat source flow, the fan, and the dosing system.

[0030] In order to ensure the timeliness and effectiveness of equipment operation and maintenance, when the sensors installed in various locations of the exhaust gas treatment equipment detect that the value exceeds or is lower than the preset alarm value, the fault alarm unit will send out an audible and visual alarm signal. At the same time, the information of the fault point will be uploaded to the HMI touch screen and the monitoring cloud platform, thereby guiding the operator to quickly and accurately find the fault point and repair it in time.

[0031] Before the papermaking waste gas treatment equipment is put into operation, check the switch status of each valve and the liquid level of each water tank through the HMI touch screen or the monitoring cloud platform. After confirming that the switch status of each valve and the liquid level of each water tank are in good condition, start the equipment through the HMI touch screen or the monitoring cloud platform.

[0032] During the operation of the waste gas treatment equipment, temperature and humidity sensors installed at the waste gas inlet, outlet and external environment of the equipment detect the temperature and humidity at each point. The detected data are transmitted to the HMI touch screen and the monitoring cloud platform. The cloud platform calculates the minimum required temperature of the waste gas at the equipment outlet by comparing the ambient temperature and the waste gas outlet temperature. When the waste gas outlet temperature is lower than the required temperature, white smoke will be generated at the outlet. At this time, the cloud platform will send a command to the reheating section heat source flow control module, and automatically control the flow of steam condensation hot water, secondary steam and fresh high-temperature steam entering the reheating section of the paper machine production line by controlling the electric valve, so as to heat the outlet waste gas and eliminate the white mist that may be generated.

[0033] The dosing system liquid level sensor detects the liquid level of the deodorant in the dosing barrel. When the liquid level in the dosing barrel is lower than the set limit, the fault alarm unit will alarm to remind the operator to add the agent. The spray liquid pH sensor detects the pH value of the spray liquid in the spray heat exchange tower and uploads the data to the HMI touch screen. When the pH value is lower than the minimum limit, the dosing system control module automatically starts the dosing pump. When the pH value reaches the maximum limit, the dosing system control module automatically stops the dosing pump. The spray liquid level sensor detects the liquid level of the spray liquid in the spray heat exchange tower. When the liquid level in the spray heat exchange tower is lower than the minimum limit or exceeds the maximum limit, the fault alarm unit will alarm to remind the operator to add water in time or find the cause of the high water level and perform maintenance in time.

[0034] In summary, this monitoring cloud platform based on the PLC system for papermaking waste gas treatment simplifies the user operation process, saves human resources, and reduces supervision costs; it realizes all-round real-time monitoring and intelligent management of papermaking waste gas treatment equipment, and gives full play to the actual effectiveness of the treatment equipment; it ensures the timeliness and effectiveness of equipment operation and maintenance, and effectively improves the waste gas treatment efficiency and supervision level.

[0035] The above-mentioned embodiments are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the scope of the invention. The technical scope of this new type of use is not limited to the content in the specification, and its protection scope must be determined according to the scope of the claims.

Claims

1. A monitoring cloud platform based on a PLC system for papermaking waste gas treatment, characterized by: It includes user end, monitoring cloud platform, HMI touch screen, PLC control system, data acquisition unit, data storage unit, fault alarm unit, data transmission unit, PLC control unit, dosing system level sensor, spray liquid level sensor, spray liquid pH sensor, exhaust gas inlet temperature and humidity sensor, exhaust gas outlet temperature and humidity sensor, external environment temperature and humidity sensor, spray liquid flow control module, reheat section heat source flow control module, fan control module, dosing system control module.

2. According to claim 1, a monitoring cloud platform for papermaking waste gas treatment based on a PLC system is characterized by: The monitoring cloud platform collects, organizes, calculates and analyzes the uploaded equipment operation data, obtains corresponding operation instructions and sends them to the HMI touch screen. At the same time, operation instructions can also be entered manually.

3. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 2 is characterized by: The HMI touch screen displays the data transmitted by the PLC control system in a graphical manner on site, uploads the data to the monitoring cloud platform and receives operation instructions fed back by the monitoring cloud platform.

4. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 3 is characterized by: The data acquisition unit collects data from multiple sensors such as the exhaust gas inlet temperature and humidity sensor, the exhaust gas outlet temperature and humidity sensor, and the external environment temperature and humidity sensor. The storage unit is used to automatically generate and save charts of data during the operation of the exhaust gas treatment system.

5. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 4 is characterized by: The fault alarm unit is used to display an alarm message and the cause of the alarm on the HMI touch screen and the monitoring cloud platform when a problem or fault occurs in a module or a point during the operation of the exhaust gas treatment equipment.

6. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 5 is characterized by: The data transmission unit uploads the data collected by the data collection unit to the HMI touch screen, and transmits the operation instructions fed back by the HMI touch screen to the PLC control unit.

7. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 6 is characterized by: The PLC control unit receives the operation instructions sent by the HMI touch screen to control the modules such as the spray liquid flow, the reheating section heat source flow, the fan, and the dosing system.

8. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 7 is characterized by: The HMI touch screen is connected to the PLC control system downward through wired signals and is connected to the monitoring cloud platform upward through wireless signals. The valves of the exhaust gas treatment equipment are all electric valves, which can be remotely controlled. The monitoring cloud platform can remotely control the start and stop of each point of the exhaust gas treatment equipment, and can also control the start and stop of each point of the exhaust gas treatment equipment on site through the HMI touch screen.

9. The monitoring cloud platform based on PLC system for papermaking waste gas treatment according to claim 8 is characterized by: Through the linkage of the user end, monitoring cloud platform, HMI touch screen and PLC control system, the touch screen operation is intuitive and easy to understand for operators, and remote monitoring and control can be carried out through the monitoring cloud platform, realizing all-round real-time monitoring and intelligent management of the exhaust gas treatment device, ensuring the timeliness and effectiveness of equipment operation and maintenance, saving human resources and reducing supervision costs.

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