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An aluminum electrolysis flue gas horizontal spray desulfurization device and method

A technology of spray desulfurization and aluminum electrolysis, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve problems such as corrosion, low desulfurization efficiency, and high operation and maintenance costs, so as to improve safety performance, reduce investment costs, and reduce The effect of desulfurization operation cost

Active Publication Date: 2017-11-03
YUNNAN RUNXIN ALUMINUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet FGD technology uses a solution or slurry containing absorbent to desulfurize and treat desulfurized products in a wet state. This method has the advantages of fast desulfurization reaction speed, simple equipment, and high desulfurization efficiency. However, severe corrosion, high operation and maintenance costs and It is easy to cause secondary pollution and other problems
The desulfurization absorption and product treatment of the dry FGD technology are carried out in a dry state. This method has the advantages of no sewage waste acid discharge, less corrosion of equipment, no obvious cooling of the flue gas during the purification process, and high flue temperature after purification, which is beneficial to the chimney. Exhaust diffusion, less secondary pollution, etc., but there are problems such as low desulfurization efficiency, slow reaction speed, and large equipment

Method used

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  • An aluminum electrolysis flue gas horizontal spray desulfurization device and method
  • An aluminum electrolysis flue gas horizontal spray desulfurization device and method
  • An aluminum electrolysis flue gas horizontal spray desulfurization device and method

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment one: SO Three kinds of states formed after being dissolved in water (SO 3 2- 、HSO 3- and H 2 SO 3 ) and pH

[0034] SO 2 After being dissolved in water, a series of dissociation equilibriums will be produced:

[0035]

[0036]

[0037]

[0038]

[0039] From formula (3):

[0040] [H 2 SO 3 ]=[H + ]·[HSO 3 － ] / Ka 1 (5)

[0041] From formula (4):

[0042] [SO 3 2- ] = Ka 2 ·[HSO 3 － -] / [H + ] (6)

[0043] While the total concentration in the liquid phase [SO 2 ] is always:

[0044] [SO 2 ] Total=[SO 3 2－ ]+[HSO 3 － ]+[H 2 SO 3 ] (7)

[0045] Substitute (5) and (6) into (7) to get:

[0046] [HSO 3 － ] / [SO 2 ] Total=Ka 1 [H + ] / ([H + ] 2+ Ka 2 ·Ka1+Ka 1 [H + ]) (8)

[0047] And by formula (5), formula (6) and formula (8):

[0048] [H 2 SO 3 ] / [SO 2 ] Total=[H + ] 2 / ([H + ] 2 +Ka 2 · Ka 1 +Ka 1 [H + ]) (9)

[0049] [SO 3 2－ ] / [SO 2 ] Total=Ka 2 · Ka 1 / ([H + ] 2 +Ka 2 · Ka 1 +Ka 1 [H +...

Embodiment 2

[0051] Example 2: Reaction mechanism of lime wet desulfurization at different pH values

[0052] (a)pH>9

[0053] The sulfur anion in the liquid phase is mainly SO2-3, which interacts with Ca 2+ Combined as CaSO 3 1 / 2H 2 O:

[0054]

[0055] In addition, because the flue gas contains oxygen, a small amount of CaSO 3 oxidized to CaSO 4 2H 2 O. At the same time CO in the flue gas at high pH 2 Soluble in water, and with Ca 2+ bound as CaCO 3 :

[0056]

[0057] When the pH of milk of lime>12, the direct desulfurization process of milk of lime will generate CaSO according to the above reaction 3 1 / 2H 2 O, CaCO 3 and CaSO 4 2H 2 O, the solubility of these calcium salts is extremely low, and it is easy to reach supersaturated crystallization, which is the main reason for the easy scaling of lime wet desulfurization when pH>9. The crystallization forms a scale layer on the wall of the desulfurization tower and the internal parts of the tower, and in severe cases...

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Abstract

The invention discloses a horizontal spray desulfurization device and method for aluminum electrolysis flue gas, comprising a limestone silo, a wet ball mill, a limestone slurry coarse material tank, an oxidation fan, a circulating slurry pump, a limestone slurry fine material tank, a limestone swirl pump, and a limestone slurry Pump, limestone slurry cyclone, horizontal absorption tower, heat exchanger, gypsum slurry pump, filter water pump, vacuum device, vacuum belt dehydrator, water separation cyclone slurry pump, waste water cyclone, gypsum slurry cyclone, booster Fans, bypass dampers and chimneys. It is mainly used to generate dihydrate gypsum in the horizontal absorption tower, and SO2 is removed. The gypsum slurry discharged from the absorption tower is dehydrated by the dehydration device and recovered. The flue gas after desulfurization is discharged. Able to obtain high-efficiency, economical, and safe treatment of low-concentration sulfur dioxide in aluminum electrolysis flue gas, new methods and supporting equipment, to achieve efficient desulfurization and dust removal, reduce investment costs, reduce desulfurization operating costs, and improve aluminum electrolysis flue gas purification equipment and work site safety performance purposes.

Description

technical field [0001] The invention relates to a desulfurization device, in particular to a horizontal spray desulfurization device and method for aluminum electrolysis flue gas. Background technique [0002] Desulfurization is to fix the sulfur element in coal into a solid with calcium base and other methods to prevent SO from being generated during combustion. 2 , through the analysis and research of desulfurization technology at home and abroad and the introduction of desulfurization process pilot plants in the domestic power industry, the current desulfurization methods can generally be divided into three categories: desulfurization before combustion, desulfurization during combustion and desulfurization after combustion. Among them, post-combustion desulfurization, also known as flue gas desulfurization (FGD for short), in FGD technology, can be divided into the following five methods according to the type of desulfurization agent: Calcium method based on CaCO3 (limest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 杨万章余强陈本松
Owner YUNNAN RUNXIN ALUMINUM
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