Anode current and temperature on-line measuring device and system for aluminum electrolytic cell

Abstract

The utility model discloses an anode current and temperature's on -line measuring device and system of aluminum electrolytic cell, and on -line measuring device includes MCU, anode current detector, temperature sensor, current detection circuit and temperature detection circuit, anode current detector and temperature sensor are N and install the anode of aluminum electrolytic cell, and current detection circuit includes the first multiplexer that connects gradually, first conditioning circuit and first ADC module, MCU still has the serial communication port for with monitoring center host computer communication. Amplification filter circuit includes first operational amplifier U1 and second operational amplifier U2, and two operational amplifiers constitute two -stage amplification circuit. The device and system can be integrated degree height, and the function is rich, can realize the real -time detection of multichannel data.

Description

Technical Field

[0001] This utility model relates to an online measuring device and system for the anode current and temperature of an aluminum electrolytic cell. Background Technology

[0002] In aluminum electrolysis equipment, it is necessary to monitor the temperature and current of the anode in real time. Moreover, the larger the amount of data collected, the easier it is to comprehensively understand the overall system status, thereby identifying problems in a timely manner and improving the overall safety of the system.

[0003] Chinese patent CN 112033566 A discloses a distributed fiber optic temperature measurement system for aluminum electrolysis cells. This system uses a temperature-measuring fiber optic cable for temperature measurement. The temperature-measuring device emits a laser signal, which returns via the fiber optic cable to form a closed loop. By detecting the return time of the light signal at different temperature measurement points, the system accurately locates each point. Furthermore, it analyzes changes in Rayleigh and Raman lines to detect the temperature at each point, enabling temperature detection at the bottom or side of the aluminum electrolysis cell. The temperature is then continuously and visually displayed in a temperature monitoring system, with alarms triggered for abnormal temperatures. However, the system requires secondary analysis of the collected data to obtain the final temperature data.

[0004] The manufacturing method of the continuous temperature measuring device for aluminum electrolytic cells disclosed in CN104359578B is described. The continuous temperature measuring device for aluminum electrolytic cells consists of a temperature measuring thermocouple, a compensating wire, a microcontroller, and a display. The temperature measuring thermocouple is connected to the microcontroller through the compensating wire to input the measured voltage signal into the microcontroller. The microcontroller is used to record and store the input voltage signal and convert it into real-time temperature data.

[0005] In the existing technology, there is also a solution that connects multiple slave devices through a single bus and uses the slave devices to collect multiple channels of temperature data.

[0006] Due to the large amount of sampled data, it is necessary to design a new type of online data measurement device and system. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide an online measuring device and system for the anode current and temperature of an aluminum electrolytic cell. This online measuring device and system for the anode current and temperature of an aluminum electrolytic cell is easy to implement, has rich functions, and can quickly realize the real-time acquisition and rapid uploading of multiple signals.

[0008] The technical solution of the utility model is as follows:

[0009] An online measurement device for the anode current and temperature of an aluminum electrolysis cell includes an MCU, an anode current detector, a temperature sensor, a current detection circuit, and a temperature detection circuit.

[0010] Both the anode current detector and the temperature sensor are N in number and installed on the anode of the aluminum electrolysis cell, where N ≥ 4 and N is an integer;

[0011] The current detection circuit includes a first multiplexer, a first conditioning circuit, and a first ADC module;

[0012] The N input ports of the first multiplexer are connected to the N anode current signals collected by the N anode current detectors. The output of the first multiplexer is connected to the analog signal input of the first ADC module through the first conditioning circuit. The digital signal output of the first ADC module is connected to the first data input port of the MCU. The first data output port of the MCU is connected to the channel selection terminal of the first multiplexer. The current signal is detected by the current detection unit (i.e., the anode current detector).

[0013] The temperature detection circuit includes a second multiplexer, a second conditioning circuit, and a second ADC module;

[0014] The N input ports of the second multiplexer are connected to the N anode temperature signals collected by N temperature sensors; the output of the second multiplexer is connected to the analog signal input of the second ADC module through the second conditioning circuit; the digital signal output of the second ADC module is connected to the second data input port of the MCU; the second data output port of the MCU is connected to the channel selection port of the second multiplexer.

[0015] The MCU also has a serial communication port for communicating with the monitoring center host.

[0016] N=16, and both the first and second multiplexers are 16-to-1 analog switches.

[0017] Both the first conditioning circuit and the second circuit use operational amplifier-based amplification and filtering circuits.

[0018] The amplifier and filter circuit includes a first operational amplifier U1 and a second operational amplifier U2;

[0019] The input signal Uin is connected to the non-inverting input of the first operational amplifier U1 via sampling resistor R2, and the input signal Uin is also grounded via grounding resistor R1; the inverting input of the first operational amplifier U1 is grounded via voltage divider resistor R3, and a feedback resistor R4 is connected between the inverting input and output of the first operational amplifier U1.

[0020] The output of the first operational amplifier U1 is connected to the non-inverting input of the second operational amplifier via a series intermediate resistor R5 (also known as the connecting resistor) and a filter resistor R6. The non-inverting input of the second operational amplifier is also grounded through a filter capacitor C1. The inverting input of the second operational amplifier is shorted to the output. The output of the second operational amplifier is the output of the amplification and filtering circuit.

[0021] The ADC module uses a 12-bit A / D converter chip.

[0022] An online measurement system for the anode current and temperature of an aluminum electrolytic cell includes a monitoring center host and multiple distributed online measuring devices; the multiple distributed online measuring devices are connected to the monitoring center host via a serial bus. Communication is achieved using a 485 bus or a CAN bus.

[0023] The online measuring device is the aforementioned online measuring device for the anode current and temperature of the aluminum electrolytic cell.

[0024] Beneficial effects:

[0025] This utility model discloses an online measurement device and system for the anode current and temperature of an aluminum electrolytic cell. The online measurement device includes an MCU, an anode current detector, a temperature sensor, a current detection circuit, and a temperature detection circuit. There are N anode current detectors and temperature sensors installed on the anode of the aluminum electrolytic cell. The current detection circuit includes a first multiplexer, a first conditioning circuit, and a first ADC module connected in sequence. The MCU also has a serial communication port for communicating with a monitoring center host. The amplification and filtering circuit includes a first operational amplifier U1 and a second operational amplifier U2, forming a two-stage amplification circuit. This device and system have high integration, rich functionality, and can realize real-time detection of multiple data streams.

[0026] It has the following characteristics:

[0027] (1) The use of a multiplexer can significantly reduce the number of A / D converters and MCU ports, saving costs and motherboard space.

[0028] (2) The use of conditioning circuits to achieve two-stage amplification and filtering can effectively remove high-frequency interference and also amplify the signal.

[0029] In summary, this online measurement device and system for the anode current and temperature of the aluminum electrolysis cell is feature-rich and easy to control. Attached Figure Description

[0030] Figure 1 This is a diagram showing the overall architecture of the detection device;

[0031] Figure 2 Schematic diagram of the conditioning circuit;

[0032] Figure 3 This is the circuit schematic of a multiplexer. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0034] Example 1: As Figure 1 An online measurement device for the anode current and temperature of an aluminum electrolysis cell includes an MCU, an anode current detector, a temperature sensor, a current detection circuit, and a temperature detection circuit.

[0035] Both the anode current detector and the temperature sensor are 16 in number and are installed on the anode of the aluminum electrolysis cell;

[0036] The current detection circuit includes a first multiplexer, a first conditioning circuit, and a first ADC module;

[0037] The 16 input ports of the first multiplexer are connected to 16 anode current signals collected by 16 anode current detectors. The output of the first multiplexer is connected to the analog signal input of the first ADC module through the first conditioning circuit. The digital signal output of the first ADC module is connected to the first data input port of the MCU. The first data output port of the MCU is connected to the channel selection terminal of the first multiplexer. The current signal is detected by the current detection unit (i.e., the anode current detector).

[0038] The temperature detection circuit includes a second multiplexer, a second conditioning circuit, and a second ADC module;

[0039] The 16 input ports of the second multiplexer are connected to 16 anode temperature signals collected by 16 temperature sensors; the output of the second multiplexer is connected to the analog signal input of the second ADC module through the second conditioning circuit; the digital signal output of the second ADC module is connected to the second data input port of the MCU; the second data output port of the MCU is connected to the channel selection port of the second multiplexer.

[0040] The MCU also has a serial communication port for communicating with the monitoring center host.

[0041] The anode current detector and temperature sensor are installed at the anode crossbeam busbar, column busbar, or anode guide rod. For specific locations, please refer to patent document CN201224772Y. For specific temperature and current acquisition, please refer to patent CN106283120A (Aluminum electrolytic cell busbar current measuring device and anode current measuring system and method).

[0042] Both the first and second multiplexers are 16-to-1 analog switches.

[0043] Both the first conditioning circuit and the second circuit use operational amplifier-based amplification and filtering circuits.

[0044] like Figure 2 The amplification and filtering circuit includes a first operational amplifier U1 and a second operational amplifier U2;

[0045] The input signal Uin is connected to the non-inverting input terminal of the first operational amplifier U1 via the sampling resistor R2. The input signal Uin (current signal is also represented as voltage signal) is also grounded via the grounding resistor R1. The inverting input terminal of the first operational amplifier U1 is grounded via the voltage divider resistor R3. A feedback resistor R4 is connected between the inverting input terminal and the output terminal of the first operational amplifier U1.

[0046] The output of the first operational amplifier U1 is connected to the non-inverting input of the second operational amplifier via a series intermediate resistor R5 (also known as the connecting resistor) and a filter resistor R6. The non-inverting input of the second operational amplifier is also grounded through a filter capacitor C1. The inverting input of the second operational amplifier is shorted to the output. The output of the second operational amplifier is the output of the amplification and filtering circuit.

[0047] A capacitor C2 is also connected between the connection point of resistors R5 and R6 and the output terminal of the second operational amplifier.

[0048] R1, R2, R3, and R4 are all 10k, and R5 and R6 are all 15k; C1 = C2 = 10nF.

[0049] Conditioning circuit, amplification and filtering circuit; using TLC2272 operational amplifier. The first stage is a non-inverting amplifier, Uout1=(R4+R3) / R3*Uin=2Uin;

[0050] The second stage is a voltage follower, i.e., Uout = Uout = 2Uin; R6 and C1 form an RC filter unit to suppress high-frequency interference.

[0051] The ADC module uses a 12-bit A / D converter chip. For example, the MAX187.

[0052] An online measurement system for the anode current and temperature of an aluminum electrolysis cell includes a monitoring center host and multiple distributed online measuring devices. The multiple distributed online measuring devices are connected to the monitoring center host via a serial bus. The communication connection uses a 485 bus or a CAN bus. The online measuring devices are the aforementioned online measuring devices for the anode current and temperature of the aluminum electrolysis cell. The temperature and current data collected by the multiple online measuring devices are aggregated via the bus to the monitoring center host for further analysis and processing, providing data support for the safe operation of the aluminum electrolysis system.

[0053] like Figure 3 The 16-to-1 analog switch has 16 input ports, namely I0-I15, which are connected to Uout0-Uout15 respectively (i.e., 16 anode current sampling signals or 16 temperature signals). The output terminal COM is connected to the ADC module; the selection terminals S0-S3 are connected to the 4 IO ports of the MCU (processor) to realize the switching (selection) of 16 channels.

[0054] Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. An online measuring device for the anode current and temperature of an aluminum electrolytic cell, characterized in that, Includes MCU, anode current detector, temperature sensor, current detection circuit and temperature detection circuit; Both the anode current detector and the temperature sensor are N in number and installed on the anode of the aluminum electrolysis cell, where N ≥ 4 and N is an integer; The current detection circuit includes a first multiplexer, a first conditioning circuit, and a first ADC module; The N input ports of the first multiplexer are connected to the N anode current signals collected by the N anode current detectors. The output of the first multiplexer is connected to the analog signal input of the first ADC module through the first conditioning circuit. The digital signal output of the first ADC module is connected to the first data input port of the MCU. The first data output port of the MCU is connected to the channel selection port of the first multiplexer. The temperature detection circuit includes a second multiplexer, a second conditioning circuit, and a second ADC module; The N input ports of the second multiplexer are connected to the N anode temperature signals collected by N temperature sensors; the output of the second multiplexer is connected to the analog signal input of the second ADC module through the second conditioning circuit; the digital signal output of the second ADC module is connected to the second data input port of the MCU; the second data output port of the MCU is connected to the channel selection port of the second multiplexer. The MCU also has a serial communication port for communicating with the monitoring center host.

2. The online measuring device for the anode current and temperature of the aluminum electrolytic cell according to claim 1, characterized in that, N=16, and both the first and second multiplexers are 16-to-1 analog switches.

3. The online measuring device for the anode current and temperature of the aluminum electrolytic cell according to claim 1, characterized in that, Both the first conditioning circuit and the second circuit use operational amplifier-based amplification and filtering circuits. The amplifier and filter circuit includes a first operational amplifier U1 and a second operational amplifier U2; The input signal Uin is connected to the non-inverting input of the first operational amplifier U1 via sampling resistor R2, and the input signal Uin is also grounded via grounding resistor R1; the inverting input of the first operational amplifier U1 is grounded via voltage divider resistor R3, and a feedback resistor R4 is connected between the inverting input and output of the first operational amplifier U1. The output of the first operational amplifier U1 is connected to the non-inverting input of the second operational amplifier via an intermediate resistor R5 and a filter resistor R6 connected in series. The non-inverting input of the second operational amplifier is also grounded through a filter capacitor C1. The inverting input of the second operational amplifier is shorted to the output. The output of the second operational amplifier is the output of the amplification and filtering circuit.

4. The online measuring device for the anode current and temperature of an aluminum electrolytic cell according to any one of claims 1-3, characterized in that, The ADC module uses a 12-bit A / D converter chip.

5. An online measurement system for the anode current and temperature of an aluminum electrolytic cell, characterized in that, It includes a monitoring center host and multiple distributed online measurement devices; the multiple distributed online measurement devices communicate with the monitoring center host via a serial bus. The online measuring device is the online measuring device for the anode current and temperature of the aluminum electrolytic cell as described in any one of claims 1-4.

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