A heat preservation method and device for an aluminum electrolytic cell using flue gas to adjust heat balance
An aluminum electrolytic cell and heat preservation device technology, applied in the field of aluminum electrolytic cell heat preservation, can solve problems such as energy consumption loss, and achieve the effect of avoiding loss and reducing actual heat loss
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[0030] see figure 1 , an aluminum electrolytic cell heat preservation device in the illustration is a preferred solution of the present invention, and specifically includes a heat preservation circuit formed by an intake pipe 101, a return pipe 103 and a number of heat exchangers 104. The high-temperature exhaust gas from the electrolytic cell passes through the outer wall of the electrolytic cell shell 1 to insulate the interior of the electrolytic cell.
[0031] The intake pipe 101 and the return pipe 103 are connected to the main pipe 23 with a straight pipe with a length of not less than 1-2 meters. The specific connection arrangement is as follows: figure 2 As shown, the intake branch pipe 101 is led out along the smoke discharge direction of the main smoke pipe 23, and the included angle α between the smoke flow direction in the intake branch pipe 101 and the smoke flow direction in the main smoke pipe is less than 30°, in order to facilitate the high-temperature exhau...
example 1
[0038] Example 1: Between every two cradle frames 1002 on the two large surfaces of a certain 420kA electrolyzer, the outer wall of the side electrolyzer shell 1 on the upper part of the cathode steel rod 1001 is welded with a heat exchanger 104, which does not interfere with the cradle frame and the steel rod touch. Connect an intake branch smoke pipe 101 to the main smoke pipe 23 of each electrolytic cell, and the high-temperature exhaust flue gas in the main smoke pipe flows into the first heat exchanger gas inlet of the power inlet through the intake branch smoke pipe 101, and the flue gas After flowing through the heat exchanger, the gas outlet of the heat exchanger enters the next heat exchanger through the heat exchanger connecting pipe 105, and the flue gas flows through all the heat exchangers 104 at the inlet end of the electrolytic cell, and then flows from the end The connecting pipe 106 flows through all the heat exchangers 104 at the power outlet, and then is tra...
Embodiment 2
[0040] Embodiment 2: On a certain 300kA electrolyzer, the flue gas flow path in Embodiment 1 is changed to first flow through all the heat exchangers 104 at the power outlet, and then flow through all the heat exchangers at the power inlet. There is a slit 1043 with a width of 0.5 cm in the middle of each heat exchanger 104, and the intake branch pipe 101 and the return branch pipe 103 connected to the main smoke pipe 23 are straight pipes with a length of 1 meter, and are connected The included angles α and β between the flow direction of the flue gas in the inlet branch pipe and the return branch pipe and the flow direction of the smoke in the main pipe are both 15°. Others are with embodiment 1.
[0041] In the above embodiments, part of the heat of the flue gas can be reasonably used for heat preservation of the side of the electrolytic cell, reducing the heat dissipation of the electrolytic cell shell, which is beneficial to the stable operation of the electrolytic cell w...
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