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Aluminum electrolysis flue gas purification and waste heat recovery system and method

A waste heat recovery system and flue gas purification technology, applied in the field of aluminum electrolysis, can solve problems such as unsatisfactory purification effect, achieve the effects of protecting health, improving heat energy utilization rate, and improving the quality of working environment

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the invention is to provide an aluminum electrolysis flue gas that can not only save energy and reduce emissions, but also reduce pollutant emissions in view of the unsatisfactory purification effect of acid-processed alumina in the existing aluminum electrolysis flue gas purification system. Purification and waste heat recovery system and method, especially suitable for aluminum electrolysis production using acid-process alumina as production raw material

Method used

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  • Aluminum electrolysis flue gas purification and waste heat recovery system and method
  • Aluminum electrolysis flue gas purification and waste heat recovery system and method

Examples

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Effect test

Embodiment 1

[0035]Seefigure 1 withfigure 2, The two aluminum electrolysis flue gas purification and waste heat recovery systems in the figure are two specific implementations of the present invention, which specifically include heat exchanger 2, dust collection chamber 3, side branch flue gas pipe 4, and water heat recovery device 5. Water storage 6, alumina material box 7, gas-solid separation chamber 8, batching chamber 9, shelling feeder 10, upper branch flue gas pipe 12, flue gas classification purifier 13, etc.

[0036]The upper branch flue gas pipe 12 leads the aluminum electrolysis flue gas from the upper part of the electrolysis cell to the air inlet of the gas-solid separation chamber 8 through the gas collecting hood set on the top of the electrolytic cell 1, and the side branch flue gas pipe 4 is a conventional aluminum electrolysis The side flue gas suction channel of the groove connects the side branch flue gas pipe 4 to the gas-solid separation chamber 8 as well.

[0037]The gas-solid s...

example 1

[0053]Such asfigure 1 As shown, for the 420KA aluminum electrolytic cell operating in the factory, the gas-solid separation chamber is equipped with a cylindrical upper part and a large-capacity processor in the shape of a funnel at the lower part. The flue gas volume can reach 150m3 / h, the flue gas flow rate collected by the upper flue gas pipe is 40m3 / h, the flue gas flow rate collected by the side branch flue gas pipe is 110m3 / h, the discharge volume of the clean alumina material box is 50kg / h, the discharge port at the bottom of the gas-solid separation chamber controls the discharge volume to be 30kg / h, and the discharge volume from the side of the gas-solid separation chamber to the batching chamber is 20kg / h. The flow of water used for heat exchange in the heat exchanger is controlled at 240L / h and pressurized to 1.2MPa to ensure smooth water flow. The flue gas grading purifier connected to the gas-solid separation chamber uses a three-stage filter partition to separate the ...

example 2

[0055]Such asfigure 2As shown, in the 300KA aluminum electrolytic cell operating in the aluminum factory, the gas-solid separation chamber is installed in the middle of the cylinder, and the evenly distributed filter cloth is hung in the inside. The upper and lower are ellipsoidal spheres, and its flue gas volume is 120m.3 / h, the flue gas flow rate collected by the upper flue gas pipe is 30m3 / h, the flue gas flow rate collected by the side branch flue gas pipe is 90m3 / h, the discharge volume of the clean alumina material box is 40kg / h, the discharge port at the bottom of the gas-solid separation chamber controls the discharge volume to be 25kg / h, and the side of the gas-solid separation chamber leads to the batching chamber with a discharge volume of 15kg / h. The water flow used for heat exchange in the heat exchanger is controlled at 220L / h and pressurized to 1.2MPa to ensure smooth water flow. Due to the small amount of flue gas treatment, a smaller model of flue gas grading purif...

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Abstract

The invention discloses an aluminum electrolysis flue gas purification and waste heat recovery system and method. The system includes a gas-solid separation chamber and an upper flue gas pipe and a side flue gas pipe respectively drawn from the upper and side parts of an electrolytic cell; The upper flue gas pipe is connected to the air inlet of the gas-solid separation chamber, and the upper flue gas pipe also serves as the pneumatic conveying pipeline of the alumina material box, and the conveying pipe of the alumina material box is connected to the upper cigarette On the trachea; the side branch smoke pipe is connected to the inside of the gas-solid separation chamber and extends to the end of the filter cloth located at the gas outlet of the gas-solid separation chamber, while the bottom of the hopper is connected to the side branch smoke through a delivery pipe pipe on. The invention utilizes acid-processed alumina in the gas-solid separation chamber for cross-current heat exchange and adsorption, which not only absorbs the flue gas, but also recovers the waste heat in the flue gas, and has high use value and practical significance for the aluminum electrolysis industrial production.

Description

Technical field[0001]The invention belongs to the technical field of aluminum electrolysis, and specifically relates to a system and method for purifying aluminum electrolysis flue gas and recovering waste heat.Background technique[0002]In the aluminum electrolysis industry, the electrolysis flue gas contains CO and CO2And a lot of harmful substances such as HF. At present, the common flue gas purification treatment method is to mix a large amount of cold air to cool the high-temperature flue gas, and then use dry or wet purification. In this process, the chemical heat of the flue gas is not used at all, and the excess air coefficient is very large (about 100 times the theoretical value), resulting in the actual amount of flue gas that needs to be treated is much greater than the theoretical value, and the flue gas treatment cost substantial improvement.[0003]The electrolytic cell produces a large amount of HF-containing flue gas during the aluminum electrolysis process. If the HF i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/22C25C3/06
CPCC25C3/06C25C3/22
Inventor 张红亮于心岩李劼国辉王棋钰王佳成孙珂娜李家琦
Owner CENT SOUTH UNIV
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