A double-layer aluminum electrolytic cell cover plate with side suction and enhanced heat preservation

Abstract

The invention discloses a double-layer aluminum electrolysis cell cover plate with side inspiration and enhanced thermal insulation. Ventilation holes (7) are drilled on an inner layer aluminum plate (2) with the ventilation holes; an upper hollow frame (1) is connected with the inner layer aluminum plate (2) with theventilation holes; an internal support framework (6) is fixedly arranged between the upper hollow frame (1) and the inner layer aluminum plate (2) with the ventilation holes; a lower solid frame (3) is connected with an outer side cell cover plate (5); and side surfaces of two ends of the inner layer aluminum plate (2) with the ventilation holes and side surfaces of two ends of the outer side cell cover plate (5) are respectively connected to form a hollow sandwich layer (4) of a two-layer aluminum plate. The thickness of the cell cover plate increases is increased, so that a thermal insulation effect can be effectively enhanced, the sealing insulation state of an electrolysis cell is improved, the thermal loss of the electrolysis cell is reduced, the energy is saved, and the consumption is reduced; the cell cover plate adopts the double-layer design to increase the hardness, so that the cell cover plate is not easy to deform after long-term use, and the service life is prolonged; and the design of the ventilation holes is matched with a gas collecting system, thus the gas collecting efficiency of the electrolysis cell can be effectively improved, thereby achieving the purpose of uniform and quick smoke absorption.

Description

technical field [0001] The invention relates to an electrolytic cell cover plate, in particular to a double-layer aluminum electrolytic cell cover plate with side suction and enhanced heat preservation. Background technique [0002] At present, the electrolytic flue gas produced by electrolytic aluminum production is mostly treated by closed gas collection and centralized purification measures. Use several tank cover plates to seal the entire electrolytic cell, and collect it through the exhaust system, and the collected flue gas passes through the exhaust branch pipes of each electrolytic cell and merges with the main exhaust pipe, and is collected in the main pipe before being sent to the purification system for purification treatment , Through the negative pressure provided by the external purification system, a balanced negative pressure is maintained throughout the hood, so that all the smoke generated on the surface of the tank shell is discharged. [0003] The benefi...

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Problems solved by technology

[0004] In actual production, the existing tank cover plate still has the following deficiencies. First, the side of the electrolytic cell is surrounded by several aluminum cover plates, and each tank cover plate cannot be completely sealed. Open the tank cover to perform work such as anode replacement, so the exhausted smoke includes not only the smoke generated by electrolysis but also a large amount of air leaked from the tank cover into the tank body, and the harmful gas generated by electrolysis will also flow from the cover. It is discharged into the air through the gap, causing environmental pollution

Secondly, the currently commonly used aluminum tank cover plate is single-layer, and the thickness is not enough to achieve a good heat preservation effect, resulting in uneven distribution of the temperature field in the electrolytic tank, affecting the stability of the electrolytic tank, and the heat radiation generated at the same time is not conducive to operator health

Thirdly, because the operator will step on the cover plate to operate, the cover plate is prone to deformation after long-term use, which will further affect the sealing effect and reduce the service life

Finally, with the development of the aluminum industry, the capacity of the electrolytic cell is also increasing rapidly, and large or even super-large cells have become dominant. The increase in the capacity of the cell will inevitably lead to an increase in the electrolysis fume. Using the upper suction of the gas collecting hood, the The gas in the middle of the tank is well collected, but the gas at the side is blocked by the cover plate of the tank and cannot be collected quickly, so the uniform and rapid absorption of smoke cannot be achieved, which affects the gas collection efficiency

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