Method and device for circularly purifying sulfur dioxide and nitrogen oxide in flue gas

A technology of sulfur dioxide and nitrogen oxides is applied in the field of flue gas purification, which can solve the problems of complex process and catalyst poisoning, and achieve the effects of low cost, strong feasibility and good treatment effect.

Pending Publication Date: 2021-12-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complex and causes catalyst poisoning

Method used

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  • Method and device for circularly purifying sulfur dioxide and nitrogen oxide in flue gas
  • Method and device for circularly purifying sulfur dioxide and nitrogen oxide in flue gas
  • Method and device for circularly purifying sulfur dioxide and nitrogen oxide in flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Circulate and purify the flue gas produced by a thermal power plant, in which SO 2 , NO X The concentrations were 2635 mg / m 3 , 383 mg / m 3 , The temperature of the flue gas entering the absorption tower is 85°C. The cathodic chamber and the anode chamber of the electrolytic reactor use perfluorosulfonic acid cation exchange membrane as the diaphragm, and a solution containing 1 mol / L ammonium sulfate as the anolyte to maintain the pH of the anolyte at 2~3, and the cathode is made of titanium-based plating. Platinum electrode, the anode is made of titanium-based cobalt tetroxide plated electrode, and the current density of both cathode and anode is 8 mA / cm 2 , the electrolysis time is 3.0 h, and the liquid-gas ratio of flue gas desulfurization and denitrification is 25 L / m 3 , the result on the system of the desulfurization and denitrification system in the small-scale purification flue gas is: the SO in the flue gas 2 and NO X The simultaneous removal efficiencies...

Embodiment 2

[0046] Circulate the flue gas produced by a coking plant to purify sulfur dioxide and nitrogen oxides in the flue gas, among which SO 2 , NO X The concentrations were 800 mg / m 3 , 600 mg / m 3 , the temperature of the flue gas entering the absorption tower is 70°C. The cathodic chamber and the anode chamber of the electrolytic reaction chamber use perfluorosulfonic acid cation exchange membrane as the diaphragm, and use the solution containing 2 mol / L ammonium sulfate as the anolyte to maintain the pH of the anolyte at 2~3, and the cathode is made of titanium-based plating. Platinum electrode, the anode is made of titanium-based cobalt tetroxide plated electrode, and the current density of both cathode and anode is 10 mA / cm 2 , the electrolysis time is 4.0 h, and the liquid-gas ratio of flue gas denitrification is 25 L / m 3 , the result on the system of the desulfurization and denitrification system in the small-scale purification flue gas is: the SO in the flue gas 2 and NO...

Embodiment 3

[0048] Circulate the flue gas produced by a steel plant to purify sulfur dioxide and nitrogen oxides in the flue gas, among which SO 2 , NO X The concentrations were 2457 mg / m 3 、300mg / m 3 The temperature of the flue gas entering the absorption tower is 85°C. The cathodic chamber and the anode chamber of the electrolytic reactor use perfluorosulfonic acid cation exchange membrane as the diaphragm, and use the solution containing 3 mol / L ammonium sulfate as the anolyte to maintain the pH of the anolyte at 2~3, and the cathode is made of titanium-based plating. Platinum electrode, the anode is made of titanium-based cobalt tetroxide plated electrode, and the current density of both cathode and anode is 10 mA / cm 2 , the electrolysis time is 4.0 h, and the liquid-gas ratio of flue gas denitrification is 25 L / m 3 , the result on the system of the desulfurization and denitrification system in the small-scale purification flue gas is: the SO in the flue gas 2 and NO X The simul...

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Abstract

The invention relates to a method and device for circularly purifying sulfur dioxide and nitrogen oxide in flue gas. The method comprises the steps of taking ammonium sulfate as a flue gas absorption medium to react in an electrolysis reactor to prepare an ammonium persulfate solution, and activating the ammonium persulfate solution entering an absorption tower spraying system through high-temperature flue gas to oxidize and absorb sulfur dioxide and nitrogen oxide in the flue gas. Meanwhile, ammonium sulfate subjected to reaction reduction can be extracted again and enters the electrolysis reactor, so that the purposes of circulating the oxidizing agent and efficiently removing sulfur dioxide and nitrogen oxide in the solution are achieved. The device is simple, small in occupied area, mild in condition and low in operation cost; secondary pollution is not generated in desulfurization and denitrification, and the device is environment-friendly and has wide pH adaptability; and N and S elements in the flue gas are recycled, and great industrial application potential is achieved.

Description

technical field [0001] The invention belongs to the field of flue gas purification, and in particular relates to a method and a device for circularly purifying sulfur dioxide and nitrogen oxides in flue gas. Background technique [0002] Very high concentrations of NOx and SO are produced during the combustion of fossil fuels 2 , is the main pollutant in the air, and will cause a series of serious environmental problems, such as photochemical smog, eutrophication, and ozone depletion. Therefore, it is of great significance to control the emission of sulfur dioxide and nitrogen oxides produced after combustion into the atmosphere. Previous desulfurization methods include wet ammonia desulfurization, dry desulfurization, semi-dry desulfurization, and flue gas circulating fluidized bed desulfurization; denitrification methods include selective catalytic reduction and selective non-catalytic reduction, and flue gas desulfurization and denitrification are widely used. The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/96B01D53/60
CPCB01D53/78B01D53/60B01D53/965B01D2258/0283Y02A50/20
Inventor 田森林杨珊珊李晨赵群宁平李英杰
Owner KUNMING UNIV OF SCI & TECH
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