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Multilevel defoaming method of evaporator

An evaporator and defoaming technology, which is applied in the direction of evaporator accessories, etc., can solve the problems of limiting evaporator capacity, destroying equipment structure, and large secondary steam volume, so as to reduce the generation of unqualified water, improve evaporation efficiency, and improve The effect of return water ratio

Active Publication Date: 2009-11-18
中铝矿业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high production capacity of the evaporator and the large amount of secondary steam, the single-pole defoaming of the original demister cannot meet the production needs. Contaminated secondary steam condensate
Secondary vapor pressure is too high, limiting evaporator capacity
However, since the forced effect and flash evaporator are pressure vessels, modifying the demister inside the tank will destroy the structure of the equipment and affect the performance and safety of the equipment
Coupled with the limitations of the existing equipment structure, it is impossible to install a demister in the tank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The diameter of the secondary steam pipe of the 4-stage flash evaporator is 700mm, and the size of the pipe demister is designed to be 1200mm in diameter, rolled with steel plate (δ=8mm), and the length is 2000mm, in which three layers of baffles are installed with a distance of 300mm and a height of 2000mm. is 900mm. The installation position is that the secondary steam pipe of the flash evaporator is facing the first baffle, and a manhole (DN 500) is installed between the first and third baffles.

Embodiment 2

[0029] The diameter of the forced secondary steam pipe is 1100mm, and the size of the pipe demister is designed to be 2000mm in diameter. The height is 1500mm. The installation position is that the forced secondary steam pipe is facing the first baffle. There is a 15° slope between the steam inlet and the steam outlet, and the installation angle is adjusted to vertical installation of the baffle, and the steam is deflected horizontally. Install manholes (DN 500) between the first and third baffles.

[0030] After installing the pipeline demister, after multi-stage demister, the treatment effect of secondary water alkalinity is obvious. When the evaporator is running, the alkalinity of the secondary water is low and stable, and rarely fluctuates. When the evaporator is started, the alkalinity of the secondary water drops very quickly, and it can be qualified within half an hour, which greatly reduces the occurrence of unqualified water and The accompanying alkali loss increa...

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Abstract

A multilevel defoaming method of an evaporator relates to a multilevel defoaming method for vapor-liquid separation of secondary steam in the evaporator in the aluminium oxide manufacturing process. The invention is characterized in that baffled defoamers are additionally installed on air outlet pipes of a flash evaporator and a forced effect steam pipe defoamer to carry out a multilevel choke flow and defoaming on the secondary steam. In the method, the treatment result of the secondary water alkalinity is obvious after the secondary steam is treated by multilevel defoaming; when the evaporator is in operation, the secondary water alkalinity is lower and steady with little fluctuation; when starting up the evaporator, the secondary water alkalinity drops rapidly and can be qualified in half an hour, thus dramatically decreasing the generation of disqualified water and improving the return ratio; a down spout is dispensed with by changing the installation angle and direction; a secondary steam control gate can be turned up progressively after the secondary water alkalinity is lowered, thus improving the degree of vacuum of the evaporator separating chamber, decreasing the boiling point of the solution and improving the evaporation efficiency.

Description

technical field [0001] The invention relates to a method for multi-stage defoaming of an evaporator, relating to a multi-stage defoaming method for vapor-liquid separation of secondary steam of an evaporator in the production process of alumina. Background technique [0002] At present, in the salt discharge process of the circulating mother liquor in the alumina production process, the 1-4 flash evaporator of the six-effect falling film external forced circulation salt discharge evaporator and the forced-effect secondary steam pass through the demister in the tank. After stage defoaming, it is introduced into the corresponding 3-6 effect heating chamber. However, due to the high production capacity of the evaporator and the large amount of secondary steam, the single-pole defoaming of the original demister cannot meet the production needs. Once the evaporator has steam pressure, vacuum fluctuations, or the entrainment of mist is serious after the secondary steam is enlarged...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/30
Inventor 桂学斌曹彦卓张强严育红
Owner 中铝矿业有限公司
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