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Method for simultaneously removing sulfur dioxide, oxynitride and elemental mercury in flue gas

A technology of sulfur dioxide and nitrogen oxides, applied in the field of flue gas purification, can solve the problems of large area, complex system, high cost, etc., and achieve the effects of low investment and operation costs, high removal efficiency, and easy production

Inactive Publication Date: 2015-07-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a single pollutant treatment equipment is used for removal, there are disadvantages such as high cost, complex system and large floor area.

Method used

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  • Method for simultaneously removing sulfur dioxide, oxynitride and elemental mercury in flue gas
  • Method for simultaneously removing sulfur dioxide, oxynitride and elemental mercury in flue gas
  • Method for simultaneously removing sulfur dioxide, oxynitride and elemental mercury in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Prepare absorbent mother liquor: make Ni(NO 3 ) 2 、KIO 4 and potassium bicarbonate at concentrations of 0.01 mol / L, 0.01 mol / L, and 0.001 mol / L, respectively, add water to mix and heat to boiling, filter after cooling, and adjust the pH value to 9 with potassium hydroxide or dilute sulfuric acid.

[0038] (2) Removal reaction: Dilute the absorbent mother liquor with water twice to obtain the absorbent, add the absorbent into the jet bubbling reactor, and react the flue gas through the jet bubbling reactor at a reaction temperature of 50°C.

[0039] (3) Post-treatment: Add sulfide to the solution in the jet bubbling reactor, filter to remove ionic mercury; then add ammonia water to remove sulfate ions and nitrate ions.

[0040] In this embodiment, the gas-liquid contact time is 0.35 seconds, through the inlet and outlet flue gas detection and analysis, SO 2 The removal rate is 98%, NO removal rate is 71%, Hg 0 The removal rate was 78%.

Embodiment 2

[0042] (1) Prepare absorbent mother liquor: make Ni(NO 3 ) 2 、KIO 4 The concentrations of potassium percarbonate and potassium percarbonate are 0.05 mol / L, 0.05 mol / L, and 0.005 mol / L, respectively, add water to mix and heat to boiling, filter after cooling, and adjust the pH value to 10 with potassium hydroxide or dilute sulfuric acid.

[0043] (2) Removal reaction: The absorbent mother liquor is diluted 3 times with water to obtain the absorbent, and the absorbent is added to the jet bubbling reactor, and the flue gas is reacted through the jet bubbling reactor, and the reaction temperature is 40°C.

[0044] (3) Post-treatment: Add sulfide to the solution in the jet bubbling reactor, filter to remove ionic mercury; then add ammonia water to remove sulfate ions and nitrate ions.

[0045] In this embodiment, the gas-liquid contact time is 0.36 seconds, through the inlet and outlet flue gas detection and analysis, SO 2 The removal rate is 98%, NO removal rate is 67%, Hg 0 T...

Embodiment 3

[0047] (1) Prepare absorbent mother liquor: make Ni(NO 3 ) 2 、KIO 4 The concentrations of potassium percarbonate and potassium percarbonate are 0.10 mol / L, 0.10 mol / L, and 0.010 mol / L, respectively, add water to mix and heat to boiling, filter after cooling, and adjust the pH value to 7 with potassium hydroxide or dilute sulfuric acid.

[0048](2) Removal reaction: Dilute the absorbent mother liquor with water 5 times to obtain the absorbent, add the absorbent into the jet bubbling reactor, and react the flue gas through the jet bubbling reactor at a reaction temperature of 50°C;

[0049] (3) Post-treatment: Add sulfide to the solution in the jet bubbling reactor, filter to remove ionic mercury; then add ammonia water to remove sulfate ions and nitrate ions.

[0050] In this embodiment, the gas-liquid contact time is 0.35 seconds, through the inlet and outlet flue gas detection and analysis, SO 2 The removal rate is 98%, NO removal rate is 73%, Hg 0 The removal rate was 83...

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Abstract

The invention discloses a method for simultaneously removing sulfur dioxide, oxynitride and elemental mercury in flue gas, and belongs to the technical field of flue gas purification. The method comprises the following steps: (1) preparing an absorbent mother liquid, namely, preparing an aqueous liquor containing nickel nitrate, periodate potassium and an additive to obtain the absorbent mother liquid; (2) removing reaction, namely, adding water into the absorbent mother liquid to be diluted by 2-10 times to obtain an absorbent, adding the absorbent into a jet bubble reactor, and performing a reaction on flue gas by the jet bubble reactor; and (3) carrying out post-treatment. According to the method disclosed by the invention, t sulfur dioxide, oxynitride and elemental mercury in flue gas are removed simultaneously by using the compound absorbent, so that the removing efficiency is high, the product is easy to treat, and secondary pollution caused by flue gas is avoided. The equipment is simple and the investment and operation expenses are low, so that the flue gas treatment cost is greatly lowered, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of flue gas purification. Background technique [0002] Sulfur dioxide, nitrogen oxides and elemental mercury are currently widely concerned air pollutants, among which elemental mercury is highly volatile, highly toxic, accumulative, and persistent. In the "Emission Standards of Air Pollutants for Thermal Power Plants" implemented in January 2012 in my country, the emission limits of sulfur dioxide, nitrogen oxides and elemental mercury are stipulated as: 100 mg / m 3 , 100 mg / m 3 and 0.03mg / m 3 . If a single pollutant treatment equipment is used for removal, there are disadvantages such as high cost, complex system and large floor area. Therefore, strengthening the research and development of multi-pollutant simultaneous control technology and exploring reasonable multi-pollutant simultaneous control methods has far-reaching significance for solving the emission control of sulfur dioxide, nitrogen oxides...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/64B01D53/60
CPCY02A50/20
Inventor 赵毅郝润龙王涵薛方明郝思琪郭青
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)