Mercury re-releasing inhibitor in wet flue gas desulfurization slurry and application method thereof

A technology for wet flue gas desulfurization and desulfurization slurry, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of reducing mercury removal efficiency of wet desulfurization system, secondary pollution, etc., and achieves the solution of mercury pollution. problems, inhibiting re-release, and improving the efficiency of mercury removal

Inactive Publication Date: 2014-04-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention is aimed at Hg in limestone-gypsum wet flue gas desulfurization slurry 2+ It is easy to be reduced and re-released into the flue gas, causing secondary pollu...

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  • Mercury re-releasing inhibitor in wet flue gas desulfurization slurry and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The desulfurization slurry used in this example is a limestone slurry with a mass fraction of limestone of 1%. Mercury re-release inhibitors during the wet flue gas desulfurization process are added to the limestone slurry. The dosage is 100 mg / L. The inhibitor composition is: sulfur Sodium sulfide 45wt%, sodium sulfide 55wt%, adjust the pH value of limestone slurry to 5.5, the temperature is 55 ℃, the simulated mixed flue gas composition is 12% CO 2 , with a volume fraction of 6% O 2 , SO with a gas concentration of 300ppm 2 , the rest is N 2 , using a peristaltic pump to pump Hg with a concentration of 50 μg / L into the bubbler reactor at a flow rate of 10 mL / h 2+ solution, the absorption liquid volume in the bubble reactor is 400mL, and the flue gas flow rate at the inlet is 1L / min. Hg in outlet flue gas 0 Concentration changes with time as figure 1 shown. The figure shows that the Hg in the outlet flue gas before adding the inhibitor 0 After the concentration ...

Embodiment 2

[0033] The desulfurization slurry used in this example is a limestone slurry with a limestone mass fraction of 1%. The mercury re-release inhibitor in the wet flue gas desulfurization process is added to the limestone slurry. The dosage is 200 mg / L. The inhibitor composition is: sulfur Potassium sulfide 35wt%, sodium sulfide 65wt%, adjust the pH value of the limestone slurry to 5.5, the temperature is 55°C, and the simulated mixed flue gas composition is 12% CO 2 , with a volume fraction of 6% O 2 , SO with a gas concentration of 300ppm 2 , the rest is N 2 , using a peristaltic pump to pump Hg with a concentration of 50 μg / L into the bubbling reactor at a flow rate of 10 mL / h 2+ solution, the absorption liquid volume in the bubble reactor is 400mL, and the flue gas flow rate at the inlet is 1L / min. The inhibition rate of the inhibitor on mercury re-release in limestone slurry reaches 90.4%.

Embodiment 3

[0035]The desulfurization slurry used in this example is a limestone slurry with a limestone mass fraction of 1%. The mercury re-release inhibitor in the wet flue gas desulfurization process is added to the limestone slurry. The dosage is 300 mg / L. The inhibitor composition is: sulfur Sodium sulfide 33wt%, sodium sulfide 67wt%, adjusted limestone H value 5.5, temperature 55°C, simulated mixed flue gas composition is 12% CO 2 , with a volume fraction of 6% O 2 , SO with a volume concentration of 300ppm 2 , the rest is N 2 , using a peristaltic pump to pump Hg with a concentration of 50 μg / L into the bubbling reactor at a flow rate of 10 mL / h 2+ solution, the absorption liquid volume in the bubble reactor is 400mL, and the flue gas flow rate at the inlet is 1L / min. The inhibition rate of the inhibitor on mercury re-release in limestone slurry reaches 95.4%.

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Abstract

The invention discloses the technical field of flue gas demercuration method, and in particular to a mercury re-releasing inhibitor in wet flue gas desulfurization slurry and application method thereof. The inhibitor disclosed by the invention comprises the following components by weight percent: 25 to 45 percent of thiosulfate and 55 to 75 percent of sodium sulfide. The additive is added into the desulfurization slurry to inhibit the release of mercury; the adding amount of the additive is 100ml/L to 600mg/L. The inhibitor can react with Hg<2+> in the slurry well by utilizing the synergistic effect of thiosulfate and sodium sulfide to form stable HgS sediment; the sediment and desulfurization gypsum enter a solid phase together and are separated and removed. Meanwhile, the inhibitor disclosed by the invention is suitable for being added under the operating conditions of a wet desulfurization system, so that the waste of the additive is reduced. By the inhibitor, the re-release of the mercury in the limestone-gypsum wet flue gas desulfurization slurry can be inhibited effectively, the demercuration efficiency of a limestone-gypsum wet flue gas desulfurization system can be improved, and the problem of mercury pollution caused by coal-fired flue gas emissions can be solved effectively.

Description

technical field [0001] The technical field of the flue gas demercuration method of the present invention, in particular relates to a mercury re-release inhibitor in a wet flue gas desulfurization slurry and an application method thereof. Background technique [0002] Mercury, as a highly toxic, highly volatile, easily deposited and long hysteresis substance in organisms, has attracted more and more attention in the field of environmental protection. Combustion of fossil fuels is the largest source of mercury emissions from human activities. According to statistics, the annual mercury emissions from coal-fired power plants in the United States reached 48 tons, accounting for one-third of the total mercury emissions from human activities; in my country, the annual mercury emissions from coal-fired power plants nationwide increased at an average rate of 5.9% from 1995 to 2003. In 2003, the mercury emitted by coal-fired power plants exceeded 100 tons. Therefore, taking measures...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D53/64
Inventor 陈传敏刘松涛刘永超刘轩贾文波
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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