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Additive for inhibiting re-release of mercury during wet method flue gas desulfurization process and using method thereof

A wet flue gas desulfurization and additive technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as secondary pollution, suppress re-release, improve mercury removal efficiency, and solve mercury pollution problems. Effect

Active Publication Date: 2013-11-20
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, to provide an additive for inhibiting the re-release of mercury in the wet flue gas desulfurization process and its use method, which can effectively solve the problem of Hg in the wet flue gas desulfurization slurry. 2+ is reduced to Hg 0 Released into the flue gas again, causing the problem of secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The desulfurization slurry used in this example is 1% limestone slurry, and 1mmol / L of additives for inhibiting mercury re-release in the wet flue gas desulfurization process are added to the limestone slurry. The additive composition is: sodium tetrasulfide 35wt%, dimethyl 30wt% sodium dithiocarbamate, 35wt% 2,4,6-trimercapto-s-triazine trisodium salt, adjust the pH value of the slurry to 5.5, the temperature is 55°C, and the simulated flue gas composition is 12% CO 2 , 6%O 2 , SO 2 300ppm, the rest is N 2 , using a peristaltic pump to pump 50 μg / L of Hg 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 inhibitory rate of the additives on the re-release of mercury in the slurry reaches 91.6%.

Embodiment 2

[0019] The desulfurization slurry used in this example is 1% limestone slurry, and 1mmol / L of additives for inhibiting mercury re-release in the wet flue gas desulfurization process is added to the limestone slurry. The additive composition is: sodium tetrasulfide 30wt%, dimethyl 45wt% dithiocarbamate, 25wt% 2,4,6-trimercapto-s-triazine trisodium salt, adjust the pH value of the slurry to 5.5, the temperature is 55°C, and the simulated flue gas composition is 12% CO 2 , 6%O 2 , SO 2 300ppm, the rest is N 2 , using a peristaltic pump to pump 50 μg / L of Hg 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 inhibitory rate of the additives on the re-release of mercury in the slurry reaches 89.4%.

Embodiment 3

[0021] The desulfurization slurry used in this example is 1% limestone slurry, and 1mmol / L of additives for inhibiting mercury re-release in the wet flue gas desulfurization process are added to the limestone slurry. The additive composition is: sodium tetrasulfide 40wt%, dimethyl 30wt% dithiocarbamate, 30wt% 2,4,6-trimercapto-s-triazine trisodium salt, adjust the pH value of the slurry to 5.5, the temperature is 55°C, and the simulated flue gas composition is 12% CO 2 , 6%O 2 , SO 2 300ppm, the rest is N 2 , using a peristaltic pump to pump 50 μg / L of Hg 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 inhibitory rate of the additives on the re-release of mercury in the slurry reaches 90.4%.

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Abstract

The invention relates to an additive for inhibiting re-release of mercury during wet method flue gas desulfurization process and a using method thereof. The additive comprises the following components in percentage by weight: 30%-45% of sodium tetrasulfide, 30%-45% of dimethyl dithiocarbamate and 10%-40% of trimercapto-triazine metal salt. At normal temperature and normal pressure, the additive is added into desulfurization slurry, and the adding amount of the additive is 50-800mg / L. The additive disclosed by the invention can perform better action with Hg2+ in the slurry by utilizing the synergistic effect of the sodium tetrasulfide, the dimethyl dithiocarbamate and the trimercapto-triazine metal salt so as to form a stable HgS precipitate or a stable chelate, and the precipitate or the stable chelate and desulfurization gypsum can enter a solid phase together for being separated and removed. Simultaneously, the composite additive is more suitable for being added under operation conditions of a wet method desulfurization system.

Description

technical field [0001] The invention relates to an additive for inhibiting mercury re-release in wet flue gas desulfurization process and its application method. 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 to control the mercury produced by coal combustion has become the focus of ...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D53/64
Inventor 姜雨泽陈传敏王传庆刘松涛李乐丰李莉
Owner STATE GRID CORP OF CHINA
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