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Reproduction method for sodium-base flue gas desulfurization liquid

A technology for desulfurization liquid and flue gas, which is applied in the regeneration field of sodium-based flue gas desulfurization liquid, can solve the problems of increasing the power consumption of flue gas desulfurization system, and achieve the effect of comprehensive utilization of resources and cost reduction

Inactive Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can effectively reduce the energy consumption of electrolysis, but the regenerated solution obtained by electrolysis still contains a large amount of sodium sulfate, and the content of sodium hydroxide that really has the ability to absorb sulfur oxides is very low. This kind of regenerated solution will be used in the absorption tower. Increase power consumption of flue gas desulfurization system

Method used

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  • Reproduction method for sodium-base flue gas desulfurization liquid
  • Reproduction method for sodium-base flue gas desulfurization liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The pH value of the desulfurization solution containing 3.3% sodium sulfite and 0.37% sodium bisulfite in a volume of 2 L was adjusted with sulfuric acid to control the pH value to 6. Air is ventilated into the desulfurization liquid through the air blast head, and the ventilation rate is 2.5L / min·L desulfurization liquid. The aeration oxidation time was maintained for 3 hours, the oxidation rate reached 100%, and a sodium sulfate solution with a concentration of 4% was obtained. According to attached figure 1 , using heterogeneous bipolar membrane-polyethylene heterogeneous anion exchange membrane-polyethylene heterogeneous cation exchange membrane-heterogeneous bipolar membrane to separate the electrolytic cell into alkali chamber, salt chamber and acid chamber. The electrode is a titanium electrode coated with ruthenium. Inject sodium sulfate solution with a concentration of 4% and a volume of 2L into the salt chamber, respectively inject sodium hydroxide and sulfu...

Embodiment 2

[0032]The operating steps are the same as in Example 1, and the operating conditions are as follows: the desulfurization solution containing 5.8% sodium sulfite and 0.65% sodium bisulfite with a volume of 2 L is adjusted to pH 4 with sulfuric acid, and the ventilation rate is 1 L / min·L for desulfurization solution, the aerated oxidation time was maintained for 2.5 hours, the oxidation rate reached 100%, and a sodium sulfate solution with a concentration of 7% was obtained. Inject the sodium sulfate solution with a concentration of 7% and a volume of 2L into the salt chamber of the bipolar membrane electrolytic cell, respectively inject sodium hydroxide and sulfuric acid solutions with a concentration of 1.5% and a volume of 0.5L into the alkali chamber and the acid chamber, and turn on electricity to start The initial current density is 35mA / cm 2 . After 3.5 hours of electrolysis, the electrolytic conversion rate of sodium sulfate reached 67%, the concentration of sodium hydr...

Embodiment 3

[0034] The operating steps are the same as in Example 1, and the operating conditions are as follows: the desulfurization solution containing 8.3% sodium sulfite and 0.92% sodium bisulfite with a volume of 2 L is adjusted to pH 5 with sulfuric acid, and air is ventilated at a rate of 2 L / min·L for desulfurization solution, the aerated oxidation time was kept for 1.5h, the oxidation rate reached 100%, and the sodium sulfate solution with a concentration of 10% was obtained. Inject the sodium sulfate solution with a concentration of 10% and a volume of 2L into the salt chamber of the bipolar membrane electrolytic cell, respectively inject sodium hydroxide and sulfuric acid solutions with a concentration of 1% and a volume of 0.5L into the alkali chamber and the acid chamber, and turn on electricity to start The initial current density is 50mA / cm 2 . After 7.5 hours, the electrolytic conversion rate of sodium sulfate reached 80%, the concentration of sodium hydroxide in the alka...

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Abstract

The invention relates to a reproduction method for sodium-base flue gas desulfurization liquid, which is characterized in that the flue gas desulfurization liquid containing sodium sulphite and sodium bisulfite is oxidized to a solution containing sodium sulfate, the solution containing sodium sulfate is electrolyzed to a sodium hydroxide solution and a sulfuric acid solution by using bipolar membrane electrodialysis. According to the invention, the electrolytic conversion rate of sodium sulfate can reach more than 90%, the obtained sodium hydroxide solution can be used as absorption liquid for a flue gas desulfurization tower, the sulfuric acid by-product is produced simultaneously. By-product sulfuric acid can be used as sulfuric acid for treating high hardness and high alkalinity. The reproduction method for sodium-base flue gas desulfurization liquid is capable of achieving the purposes of strong brine zero-draining, comprehensive resource utilization and cost reduction.

Description

technical field [0001] The invention relates to a regeneration method of flue gas desulfurization liquid, in particular to a regeneration method of sodium-based flue gas desulfurization liquid. Background technique [0002] The presence of sulfur oxides in the air can seriously affect people's physical and mental health. At the same time, it is also an air pollutant, and its accumulation in the atmosphere is a major cause of acid rain. Acid rain can wither forests, acidify soils and lakes, reduce crop yields, and corrode metal and building materials. Therefore, the pollution problem of sulfur oxide has been paid more and more attention by the World Health Organization, the United Nations Environment Program and various countries. How to reduce the emission of sulfur oxides into the air without affecting industrial production has become an urgent problem to be solved. [0003] Hundreds of flue gas desulfurization technologies have been researched and developed by various c...

Claims

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Application Information

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IPC IPC(8): B01D53/96B01D53/78B01D53/50C25B1/16
Inventor 徐传海郦和生吴颖王岽秦会敏杨玉李博伟楼玉慧张春原王洪英
Owner CHINA PETROLEUM & CHEM CORP
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