Aluminum electrolytic cell current efficiency analyzer

Abstract

The invention discloses a current efficiency analyzer for an aluminum electrolytic cell, which comprises a gas sampling head, a gas pretreatment device, a vacuum pump, an infrared gas sensor and a data processing device sequentially connected through a gas transmission pipeline, and a device is arranged between the vacuum pump and the infrared gas sensor. Gas monitoring device, the gas monitoring device transmits the monitored data to the data processing device connected to it, and monitors the flow rate, temperature and humidity of the gas in real time. When the flow rate of the flow meter is too small or the temperature and humidity are abnormal, an alarm signal is sent; gas pretreatment When using a new type of dust collector and filter to make the infrared gas sensor cleaner; the data processing device is an embedded computer. The invention is more convenient to move, more reliable in data processing, and can realize remote maintenance and debugging through the network. The invention has a novel concept and a reasonable design, and can continuously measure the instantaneous current efficiency of the electrolytic cell in real time, and the captured current efficiency parameters are counted in seconds, so that the monitoring of the current efficiency is more accurate and perfect.

Description

Technical field: [0001] The invention relates to the measurement of the current efficiency of an aluminum electrolytic cell, in particular to a real-time continuous measurement device for the current efficiency of an aluminum electrolytic cell. Background technique: [0002] For industrial aluminum electrolytic cells, it is necessary and difficult to accurately measure the current efficiency of the electrolytic cell in a short period of time. Generally, aluminum factories only calculate the electrolytic rate based on the amount of aluminum produced within a period of time and the amount of molten aluminum in the cell. The current efficiency of the slot is calculated as: [0003] CE ( % ) = Σ i = 1 n M i - ...

AI Technical Summary

Problems solved by technology

Currently, electrolyzer inventories and chemical measurements of CO are commonly used 2 method to measure the current efficiency, but the current measurement method of the current efficiency of aluminum electrolytic cells in the inventory method measurement period is too long; and the chemical measurement of CO 2 The method requires a lot of manual operations, and the requirements for the operating level of the operators are relatively strict. The measured value cannot be continuous, and the change of the instantaneous current efficiency cannot be captured. Current efficiency real-time measurement device", which is based on the anode gas analysis method of the instantaneous current efficiency of industrial electrolyzers, and uses a new type of NDIR infrared gas sensor to continuously measure CO in the anode gas online 2 Gas content, and then real-time continuous measurement of the instantaneous current efficiency of the electrolyzer

However, the following problems occurred during the application process: 1. In the process of gas pretreatment, sedimentation dust collectors, ceramic filters, water bath dust collectors, and hydrophobic filters were used. The structure was complex, and the ceramic filters contained dust and moisture in the flue gas Under the action of the filter, it will be blocked quickly, need to be replaced frequently, the use cost is high, and the operation is inconvenient. The water bath dust collector and the hydrophobic filter contain water, and the evaporation of the water will cause the humidity in the gas to increase, which will affect the normal operation of the analyzer.

2. Since the flowmeter cannot be monitored in real time, when the gas extraction head is blocked, the dust removal and filtration are not complete, or the temperature and humidity change excessively, the gas flow rate will change abnormally, causing the analyzer to fail to measure normally

3. The system uses a PC to process data. Since the system operates in the strong magnetic field environment of the electrolysis workshop, the PC storage uses a disk memory, which is easily disturbed by the magnetic field, resulting in data loss, and the volume is large, and it is inconvenient to move and install.

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