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ã€ALUMINIUM NETWORK】Aluminum electrolysis production is carried out in high-temperature molten salt liquids around 950°C. The carbon blocks on the side of the tank require high temperature resistance, corrosion resistance and oxidation resistance, which is conducive to the establishment of a regular and solid furnace floor. And to meet the long-term high temperature bath production needs. However, the side carbon block has large heat dissipation, and the heat loss at the bottom is also very serious, resulting in a large amount of energy consumption. At present, the energy efficiency in the aluminum electrolytic industry production is quite low, only about 48%. Due to material properties and Other reasons, traditional insulation materials not only fail to meet the insulation and insulation requirements, but also affect the size of the crucible in the crucible and deteriorate the normal operation of the electrolyte. Therefore, domestic electrolytic production enterprises rarely perform insulation attempts in the tank. . Henan Yugang Longquan Aluminum Co., Ltd. has recently adopted nano-hole super insulation and heat insulation materials in the electrolytic cell, which has achieved a very significant energy-saving effect.
The nanohole super thermal insulation material is a newly developed high-efficiency thermal insulation material that is produced by adopting nano technology and facing high-temperature insulation engineering. Its pore size is smaller than the average molecular free path of air, and has a very low bulk density, which can effectively inhibit heat conduction. Gas convection and radiation heat transfer, its thermal conductivity is lower than still air from room temperature to 1100°C throughout the operating temperature range, and the thermal conductivity hardly changes with increasing temperature. The insulation effect can be increased by a factor of 10 compared to the currently used thermal insulation materials. The use of this material can reduce the thickness of the thermal insulation layer by 50% and can be used stably for a long period of time at a temperature of 1000°C. When the traditional insulation material is 30%~40% thick, the energy saving rate can generally reach 25%~40%, which not only can significantly reduce the energy consumption in production and use, but also can greatly reduce the size and weight of the equipment. .
Using the ultra-thin, high-heat insulation and heat-dissipating properties of nano-hole materials, a layer of 10 mm thick nano-hole material is laid on the inner wall of the tank shell, which has little effect on the groove size and side performance, but can meet the requirements of electrolytic low energy production technology. The heat loss at the bottom of the electrolytic cell accounts for about 5% to 7% of the total heat dissipation. A layer of nano-insulation material is added under the anti-seepage material, which greatly reduces the heat dissipation at the bottom under the slight change of the groove lining structure. Electrolytic cell insulation effect. For this type of electrolytic cell equipped with nano-insulated thermal insulation, the calcining technique was used to start firing. In the roasting process, the temperature gradient of the electrolyzer is relatively uniform, and the electrolyzer rarely causes local overheating. After about 85 hours, the average temperature of the electrolytic cell furnace reaches 836°C, the electrolyte block in the seam has been completely melted, the electrolyte solution is covered with the bottom of the furnace, and the required temperature for starting the electrolytic cell is reached, which is shortened by about 10 hours compared with the conventional one. . Furnace formed an irregular whole and entered the normal period of electrolysis production was significantly faster.
The use of nanohole super insulation materials on six large-scale electrolytic cells has proved that the operation of the electrolysis cell is stable through the practice of long-term production and operation. Compared with an electrolysis cell without a nano-hole insulation material, the effect of energy conservation and consumption reduction is quite remarkable. Nano-insulated trough voltage dropped to 3.7V, reducing 40~60mV; nano-slot current efficiency reached 91.3%, higher than ordinary electrolytic cell. The temperature of the steel plate at the side of the nano-tank averaged 230.5°C, decreased by 20 to 24°C, and the bottom temperature decreased by 5 to 8°C. The temperature and electrolyte level of the nano-tank are basically the same as those of the common electrolytic cell, but the aluminum level is higher than that of an ordinary electrolytic cell. In the case of low voltage and low energy expenditure, the electrolytic cell has sufficient heat, indicating that the effective insulation of the electrolytic cell greatly reduces the heat loss. (Steel Research)
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