Intelligent monitoring system for voltage dispersion of ionic membrane electrolytic cell

Abstract

The utility model discloses an intelligent monitoring system for voltage dispersion of an ionic membrane electrolytic cell, which comprises an electrolytic cell, a voltage monitoring system, a plurality of voltage acquisition modules and a plurality of voltage monitoring systems, the voltage acquisition modules are respectively connected with a plurality of ionic membrane units in the electrolytic cell by taking the negative electrode of the electrolytic cell as a base point and are used for acquiring the voltage of each ionic membrane unit in the electrolytic cell, and the plurality of voltage acquisition modules are connected in parallel to the communication signal conversion module through communication signals; and the voltage acquisition module adopts a communication signal conversion module to realize ultra-long-distance communication with the voltage monitoring system and is used for realizing real-time remote monitoring of the voltage of each ionic membrane unit. The device is simple in structure, can quickly and accurately position fault points, and improves the maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell monitoring, specifically to an intelligent monitoring system for voltage dispersion in ion-exchange membrane electrolytic cells. Background Technology

[0002] The chlor-alkali industry refers to the industrial production of caustic soda, chlorine, and hydrogen by electrolyzing a saturated NaCl solution. Electrolysis takes place in a vertical diaphragm electrolyzer, with the diaphragm dividing the cell into an anode and a cathode chamber. After the power is switched on, under the influence of the electric field, negatively charged Cl- and OH- ions move towards the anode, while positively charged Na+ and H+ ions move towards the cathode. The safe and stable operation of the ion-exchange membrane electrolyzer is closely related to the voltage of the individual cells; therefore, the operational status of the electrolyzer is typically monitored by measuring the voltage of the individual cells.

[0003] For example, the ion-exchange membrane electrolysis section of the chlor-alkali plant has a total of 8 ion-exchange membrane electrolyzers (4 in Phase I, each with 96 electrolysis units; 4 in Phase II, each with 156 electrolysis units, totaling over 1000 electrolysis units). During operation, when voltage monitoring of each individual cell is required (voltage measurements are performed four times every 24 hours), personnel must go to the site to measure the voltage of over 1000 units using multimeters. This poses a certain degree of danger to personnel and equipment and involves a significant workload. Furthermore, the ion-exchange membrane electrolyzers are connected to the SIS system based on the total voltage of each cell, not the precise voltage of each individual cell, thus preventing real-time monitoring of the voltage of each individual electrolysis unit.

[0004] There is an existing online measurement and display device for unit cell voltage of an ion membrane electrolyzer with publication number CN201320405370. However, this online monitoring device connects multiple monitoring units in series in the voltage acquisition circuit. If one of them fails, all of them will report errors, making it impossible to determine the location of the fault point, resulting in the entire system being shut down for maintenance. In addition, this method involves a large number of wiring terminals and modules, resulting in a large workload for maintenance. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an intelligent monitoring system for voltage dispersion in ion-exchange membrane electrolyzers. This system optimizes wiring methods, enables real-time voltage monitoring of each electrolyzer, allows for rapid and accurate location of faults, reduces workload, and improves maintenance efficiency.

[0006] The technical solution adopted to achieve the purpose of this utility model is:

[0007] An intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer includes an electrolyzer and a voltage monitoring system. The electrolyzer has several ion-exchange membrane units, and also includes multiple voltage acquisition modules and the voltage monitoring system. Each voltage acquisition module is connected to one of the multiple ion-exchange membrane units in the electrolyzer, with the negative electrode of the electrolyzer as the base point, to acquire the voltage of each ion-exchange membrane unit. The communication signals of the multiple voltage acquisition modules are connected in parallel to a communication signal conversion module. The voltage acquisition modules use the communication signal conversion module to achieve long-distance communication with the voltage monitoring system, enabling real-time remote monitoring of the voltage of each ion-exchange membrane unit. This invention has a simple structure and can quickly and accurately locate fault points.

[0008] Furthermore, a fuse is provided between the voltage acquisition module and each ion membrane unit.

[0009] Furthermore, it also includes an alarm device connected to the voltage monitoring system for real-time alarm purposes.

[0010] Furthermore, the voltage acquisition module is an SM2.6-60 voltage acquisition module.

[0011] Furthermore, the voltage monitoring system is equipped with a display screen, which is used to display real-time monitoring, real-time reports, real-time curves, historical alarms, historical curves, and historical reports.

[0012] Furthermore, the communication signal conversion module adopts an RS485 to fiber optic transceiver RS485 to USB module.

[0013] Furthermore, each of the electrolytic cells is equipped with a power distribution cabinet.

[0014] The above technical solution offers the following advantages: This solution utilizes multiple voltage acquisition modules to collect the voltage of each ion-exchange membrane unit. Each voltage acquisition module is connected to multiple ion-exchange membrane units in the electrolyzer, with the negative electrode of the electrolyzer as the base point. The signal is then transmitted to the voltage monitoring system via a communication signal conversion module, enabling remote, real-time, single-point monitoring of the voltage of each ion-exchange membrane unit. This remote monitoring improves the safety of operating personnel and equipment. If a voltage fault occurs in a single ion-exchange membrane unit, it can be quickly and accurately located, and the fault points are independent of each other, facilitating maintenance without a complete shutdown.

[0015] It also includes an alarm device, which is connected to the voltage monitoring system and can issue an alarm in real time when the voltage is abnormal.

[0016] A fuse is installed between the voltage acquisition module and each ion membrane unit. Connecting the fuse before the voltage signal enters the voltage acquisition module effectively protects the normal operation of the electrolyzer in the event of a fault in the secondary circuit.

[0017] The voltage monitoring system is equipped with a display screen, which is used to display real-time monitoring, real-time reports, real-time curves, historical alarms, historical curves and historical reports. It can query historical voltage reports and alarm records, view the voltage curve of each membrane, and analyze the electrolytic cell process status and membrane health.

[0018] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of specific embodiment 1;

[0020] Figure 2 This is the real-time monitoring screen shown in Specific Implementation Example 1;

[0021] Figure 3 This refers to the real-time alarm screen in Specific Implementation Example 1;

[0022] Figure 4 This refers to the real-time report screen in Specific Implementation Example 1;

[0023] Figure 5 This is a historical report screen from Specific Implementation Example 1. Detailed Implementation Specific Implementation Example 1:

[0025] See Figures 1 to 5 As shown, an intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer includes an electrolyzer and a voltage monitoring system, multiple voltage acquisition modules, an alarm, and a display screen. The electrolyzer is equipped with several ion-exchange membrane units. The voltage acquisition modules are SM2.6-60 voltage acquisition modules. The SM2.6-60 voltage acquisition modules have photoelectric isolation function when acquiring voltage data. At the same time, each SM2.6-60 voltage acquisition module can acquire 54 voltage data points, which greatly saves costs and reduces the size of the power distribution cabinet.

[0026] Each voltage acquisition module is connected to one of the multiple ion-exchange membrane unit cells in the electrolytic cell, with the negative electrode of the electrolytic cell as the base point, to acquire the voltage of each ion-exchange membrane unit cell in the electrolytic cell. Possibly, a fuse is provided between each voltage acquisition module and each ion-exchange membrane electrolytic unit cell.

[0027] The communication signals of each voltage acquisition module are connected in parallel to the communication signal conversion module. The voltage acquisition module communicates with the voltage monitoring system through the communication signal conversion module, which includes an RS485 to fiber optic transceiver and an RS485 to USB interface module. This facilitates real-time remote monitoring of the voltage of each ion membrane unit. The alarm is electrically connected to the voltage monitoring system for real-time alarm functions. The voltage monitoring system is electrically connected to a display screen, which displays real-time monitoring data, real-time reports, real-time curves, historical alarms, historical curves, and historical reports. The host computer of the voltage monitoring system is equipped with KingSCADA software. The voltage monitoring system is located in the DCS area.

[0028] In this specific embodiment, we take a phase I with 4 electrolytic cells, each with 96 electrolytic unit cells, and a phase II with 4 electrolytic cells, each with 156 electrolytic unit cells, for a total of 1008 electrolytic unit cells as an example. In the phase I, with 4 electrolytic cells and 96 electrolytic unit cells per cell, two voltage acquisition modules are used to collect voltage, for a total of eight voltage acquisition modules. In the phase II, with 4 electrolytic cells and 156 electrolytic unit cells per cell, three voltage acquisition modules are used to collect voltage, for a total of twelve voltage acquisition modules. Therefore, 1000 electrolytic unit cells require twenty SM2.6-60 voltage acquisition modules. After acquiring the voltage, the SM2.6-60 voltage acquisition modules output RS485 signals, which are then connected in parallel and converted into optical signals by an RS485-to-fiber optic transceiver. These signals are transmitted via optical fiber to the DCS, and then converted back into RS485 signals by the same transceiver. The signals are then transmitted via RS485-to-USB to the host computer of the voltage monitoring system. The communication signal conversion module uses Modbus. The RTUS protocol is used to communicate with the voltage monitoring system. Real-time monitoring of the cell voltage is achieved using a smart monitoring system based on KingSCADA software for voltage dispersion in the ion-exchange membrane cell.

[0029] By employing multiple SM2.6-60 voltage acquisition modules to collect the voltage of each ion-exchange membrane, and then transmitting the data via fiber optic cable through the DCS system to the voltage monitoring system for remote monitoring, the following advantages are achieved: 1. This eliminates the need for on-site measurement of over 1000 voltage readings for ion-exchange membrane monitoring, significantly reducing labor costs. 2. This system improves personnel and equipment safety by eliminating the inherent dangers of personnel needing to be on-site to measure voltage. 3. It accurately monitors the real-time voltage of each electrolyzer and includes a threshold alarm function, providing precise fault location for the process. 4. The optimized wiring method ensures that fault points do not affect each other, facilitating non-stop maintenance. 5. The voltage monitoring system allows querying historical voltage reports and alarm records. 6. The display screen shows the voltage curve of each membrane, enabling analysis of the electrolyzer process status and membrane health.

Claims

1. A voltage dispersion intelligent monitoring system for an ion-exchange membrane electrolyzer, comprising multiple electrolyzers and a voltage monitoring system, wherein each electrolyzer is provided with several ion-exchange membrane units, characterized in that: It also includes multiple voltage acquisition modules and a voltage monitoring system. Each voltage acquisition module is connected to multiple ion membrane units in the electrolyzer with the negative electrode of the electrolyzer as the base point, and is used to acquire the voltage of each ion membrane unit in the electrolyzer. Multiple voltage acquisition modules are connected in parallel to a communication signal conversion module. The voltage acquisition modules communicate with the voltage monitoring system through the communication signal conversion module to realize real-time remote monitoring of the voltage of each ion membrane unit.

2. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: A fuse is provided between the voltage acquisition module and each ion membrane unit.

3. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: It also includes an alarm, which is connected to the voltage monitoring system for real-time alarm purposes.

4. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: The voltage acquisition module is an SM2.6-60 voltage acquisition module.

5. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: The voltage monitoring system is equipped with a display screen, which is used to display real-time monitoring, real-time reports, real-time curves, historical alarms, historical curves, and historical reports.

6. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: The communication signal conversion module uses an RS485 to fiber optic transceiver and an RS485 to USB module.

7. The intelligent monitoring system for voltage dispersion in an ion-exchange membrane electrolyzer according to claim 1, characterized in that: Each of the electrolytic cells is equipped with a power distribution cabinet.

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