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A method of using low-grade alkali-containing brine for flue gas desulfurization-oxidation nitrate production

A low-grade, alkaline brine technology, applied in the field of nitrate-making process, can solve the problems of low-grade nitrate-making raw materials and the inability to fully utilize low-grade alkali-containing brine, so as to achieve reduced energy consumption, high application value and environmental benefits, and reduced production cost effect

Active Publication Date: 2020-01-10
江苏白玫化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned defects, the object of the present invention is to provide a method for using low-grade alkali-containing brine for flue gas desulfurization-oxidative nitrate production, in order to solve the problem that the grade of raw materials for nitrate production is obviously reduced, and the low-grade alkali-containing brine cannot be fully utilized. At the same time, it can remove SO from the flue gas 2 , so that the flue gas reaches the emission standard

Method used

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  • A method of using low-grade alkali-containing brine for flue gas desulfurization-oxidation nitrate production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. The alkali-containing brine is pumped from the bottom of the desulfurization tower by the slurry transfer pump into the upper part of the desulfurization tower, and is distributed by spraying. When it falls to the bottom of the desulfurization tower, the slurry transfer pump is pumped from the bottom of the desulfurization tower into the spray system at the top of the desulfurization tower. Circulation, the flow of alkali-containing brine is 100m 3 / h, pH value is controlled to 7.5;

[0032] b. The boiler flue gas is blown in from the bottom of the desulfurization tower by a fan, flows countercurrently with the alkaline water containing halogen, and contacts desulfurization. The flue gas flow rate is 180,000m 3 / h, the liquid-gas ratio of the alkali-containing brine entering the desulfurization tower and boiler flue gas is 1:1.8 L / m 3 , The flue gas after desulfurization is discharged from the top outlet of the desulfurization tower, and through online detection, SO in th...

Embodiment 2

[0039] a. The alkali-containing brine is pumped from the bottom of the desulfurization tower by the slurry transfer pump into the upper part of the desulfurization tower, and is distributed by spraying. The flow rate of the alkali-containing brine is 200m 3 / h, pH value is controlled to 6.5;

[0040] b. The boiler flue gas is blown in from the bottom of the desulfurization tower by a fan, flows countercurrently with the alkali water containing halogen, and contacts desulfurization. The flue gas flow rate is 220,000m 3 / h, the liquid-gas ratio of the alkali-containing brine entering the desulfurization tower and boiler flue gas is 1:1.1 L / m 3 , The flue gas after desulfurization is discharged from the top outlet of the desulfurization tower, and through online detection, SO in the flue gas after desulfurization 2 The concentration is 200mg / Nm 3 , Comply with emission standards

[0041] c. It is used in the deoxidation reactor of alkali-containing brine after flue gas desulfurization, ...

Embodiment 3

[0047] a. The alkali-containing brine is pumped from the bottom of the desulfurization tower by the slurry transfer pump into the upper part of the desulfurization tower, and is distributed by spraying. When it falls to the bottom of the desulfurization tower, the slurry transfer pump is pumped from the bottom of the desulfurization tower into the spray system at the top of the desulfurization tower. Circulation, the flow rate of alkaline brine is 150m 3 / h, pH value is controlled to 7;

[0048] b. The boiler flue gas is blown in from the bottom of the desulfurization tower by a fan, flows countercurrently with the alkali water containing halogen, and contacts desulfurization. The flue gas flow rate is 135000m 3 / h, the liquid-gas ratio of the alkali-containing brine entering the desulfurization tower and boiler flue gas is 1:0.9 L / m 3 , The flue gas after desulfurization is discharged from the top outlet of the desulfurization tower, and through online detection, SO in the flue ga...

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Abstract

The invention discloses a method for performing flue gas desulfurization-oxidization nitrate preparation through low-grade alkali-containing brine. The method is characterized in that the low-grade alkali-containing brine which cannot be directly applied to nitrate preparation is applied to boiler flue gas desulfurization to remove SO2 in flue gas, so that the flue gas can be emitted up to standard, and NaHSO3 and Na2SO3 are generated simultaneously; Na2SO4 is generated through oxidization, so that the Na2SO4 content in the brine is increased, and the Na2SO4 can be directly taken as a raw material for producing anhydrous sodium sulphate. By adopting the method, the composition characteristic of the low-grade brine is utilized reasonably, the sulfur content of the boiler flue gas is lowered effectively through a desulfurizing-oxidization technology, and the flue gas can be emitted up to standard; the desulfurized brine is recycled in situ, and the removed sulfur is fixed and recycled, so that energy consumption is lowered. The enterprise cost is lowered, and the discharge of waste water and emission of waste gas are reduced; the method has higher application value and environmental benefit.

Description

Technical field [0001] The invention belongs to the field of nitrate production technology, and specifically relates to a method for oxidizing nitrate production after using low-grade alkali-containing brine for boiler flue gas desulfurization during the production of sodium sulfate. Background technique [0002] Yuanming powder, scientific name anhydrous sodium sulfate, inorganic compound, chemical formula Na 2 SO 4 , White crystal or powder, decahydrate is also called Glauber's salt, which is widely used in printing and dyeing, papermaking, washing, metallurgy and other industries. The Hongze Lake area in Jiangsu contains huge glauber's salt resources. In this area, several medium- and large-scale sodium sulfate production enterprises such as Baimei, Shanghai Pacific, and Nanfeng have been established, and the largest sodium sulfate production base in Asia has now been established. [0003] The main existing production methods in this area are: extracting the underground mirabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/18C01D5/04
CPCB01D53/18B01D53/502B01D53/78B01D2257/302B01D2258/0283C01D5/04
Inventor 孟雷李祥孟献亮奚海周浩任晓乾
Owner 江苏白玫化工有限公司