Energy equilibrium control method for aluminum cell

A technology of energy balance and control method, which is applied in the production field of aluminum electrolysis industry to achieve the effect of effective control of energy balance control

Inactive Publication Date: 2008-01-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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Embodiment 1

[0015] Among the process parameters of the electrolytic cell, when the series current, electrolyte level, aluminum level, calcium fluoride concentration, magnesium fluoride concentration, lithium fluoride concentration, and alumina concentration remain unchanged, the technical parameters that affect the energy balance of the electrolytic cell are The remaining tank operating voltage, aluminum fluoride concentration. Therefore, the way to control the energy balance of the electrolytic cell is to adjust the operating voltage of the cell and the concentration or addition of aluminum fluoride, so that the electrolyte temperature, primary crystal temperature, and superheat are controlled within the target range. The content of the present invention includes two parts, the adjustment technology of the tank working voltage and the adjustment technology of the concentration or addition of aluminum fluoride.

[0016] Cell working voltage adjustment technology (1) Choose 8 normal electr...

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Abstract

The invention relates to a production process for the aluminum electrolytic industry, in particular to an energy balance controlling way for aluminum electrolytic tanks, which comprises a tank controller and an up-level unit. The process comprises: 1) the adjusting of the operation voltage of the tank; 2) the adjusting of the concentration or addition volume of aluminum fluoride. The benefits with the invention are: 1. that the balance controlling of the energy for the pre-baked aluminum electrolytic tank is efficiently controlled; 2. that the controlling accuracy of plus or minus 5 Celsius system for the electrolyte temperature, the primary crystal temperature of the electrolyte and the overheat rate is up to 80% above; 3. that the average thickness of the side furnace ledge of the aluminum electrolytic tank is 120 swung dash 150 mm, a regular structure in the inside of the furnace chamber is formed; 4. that the operation voltage of the aluminum electrolytic tank is controlled to be 4.04 swung dash 4.06V, the average voltage drop for the cathode is 390 mV, and the DC consumption reduces 50kWh/t is multiplied by Al. The invention is applicable for energy-balancing control for pre-baked aluminum electrolytic tanks.

Description

technical field [0001] The invention relates to a production method in the aluminum electrolysis industry, in particular to an energy balance control method for an aluminum electrolysis cell. Background technique [0002] The energy balance of the aluminum electrolytic cell is controlled by an intelligent fuzzy control system. The control principle is as follows: according to the process parameters such as the concentration of electrolyte aluminum fluoride in the electrolytic cell and the cathode voltage drop, the working voltage of the electrolytic cell is set to achieve the purpose of energy balance control; the addition of alumina is controlled by tracking the cell resistance. Rate control to achieve the purpose of controlling the concentration of aluminum oxide in the electrolyte. Its shortcomings are: due to the hysteresis of the detected aluminum fluoride concentration, when the working voltage of the electrolytic cell is set, 3 to 5 days have passed, and the electrol...

Claims

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Application Information

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IPC IPC(8): C25C3/20
Inventor 周新林胡俊杰王广稳曹继明何建涛蔡有萍马思聪张机琴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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