Ammonia desulfurization method for effectively removing chlorine and fluorine ions and heavy metal ions

A heavy metal ion, ammonia desulfurization technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as device corrosion, excessive heavy metal content, soil heavy metal pollution, etc.

Inactive Publication Date: 2012-04-25
赵加勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, whether it is the traditional double-tower absorption process or the improved single-tower absorption process, there is a difficult problem to solve, that is, the chloride ions, fluorine ions and heavy metal ions in the flue gas will be continuously enriched in the desulfurizat

Method used

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  • Ammonia desulfurization method for effectively removing chlorine and fluorine ions and heavy metal ions
  • Ammonia desulfurization method for effectively removing chlorine and fluorine ions and heavy metal ions
  • Ammonia desulfurization method for effectively removing chlorine and fluorine ions and heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, the flue gas from the boiler at a temperature of 130°C has a flow rate of 1.2×10 6 Standard cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 3000mg / Nm 3 , the dust content is 100mg / Nm 3 . The flue gas enters the pre-washing tower 6 from the flue gas inlet 1 of the pre-washing tower, sprays fresh water through the fresh water spray pipe 2 and sprays it to cool down to 80°C, and the flue gas in the pre-washing tower 6 circulates and sprays with the pre-washing tower The scrubbing solution sprayed by pipe 3 is fully contacted, the temperature of the flue gas drops to 56°C, and the Cl in the flue gas - , F - 95% is removed, soluble metal ions such as: Fe 3+ , Hg 2+ , Pb 2+ 70%-80% is removed, 70%-80% of dust is removed, and most of Cl is washed away - , F - and most Fe 3+ , Hg 2+ , Pb 2+ The flue gas of soluble metal ions and dust leaves the pre-washing tower 6 from the pre-washing tower flue gas outlet 7, and...

Embodiment 2

[0042] The flow process of embodiment 2 is exactly the same as that of embodiment 1, the difference is that the flue gas is from the sintering machine of the iron and steel plant, the temperature is 120 ℃, and the flue gas flow rate is 1.6×10 6 Standard cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 1300mg / Nm 3 , the dust content is 100mg / Nm 3 ;

[0043] The concentration of sulfur dioxide in the clean flue gas discharged after desulfurization by the desulfurization tower 10 is 65mg / Nm 3 , the dust content is 20mg / Nm 3 . The measurement results of impurities in finished fertilizers are:

[0044]

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Abstract

The invention relates to an ammonia desulfurization method for effectively removing chlorine and fluorine ions and heavy metal ions. The invention is characterized in that prewashing is carried out before flue gas enters into a desulfurization tower, industrial water and/or circulating water can be used as washing liquid in a prewashing tower, circular spraying and washing are performed, 90-95% Cl<-> and F<-> in flue gas are removed, 70%-80% soluble metal ions Fe<3+>, Hg<2+> and Pb<2+> can be removed, 70%-80% of dust is removed, the washed pollutant is sent to a waste water treatment system through slurry-containing waste water discharged from the bottom of the tower for treating to reach the standard and then discharge. The ammonia desulfurization method of the invention can thoroughly eliminate the problems that severe equipment corrosion is caused by enrichment of Cl<-> and F<-> on the desulphurization system, and heavy metal of the finished product fertilizer exceeds the standard.The desulphurization byproduct ammonium sulfate fertilizer obtained by the method can reach or exceed the quality standard of the national standard superior products.

Description

technical field [0001] The present invention relates to a new ammonia-based desulfurization device and method, in particular to a method that can effectively remove chlorine and fluorine ions and reduce the content of heavy metal ions in by-products by using ammonia (ammonia water, liquid ammonia) as an absorbent to remove sulfur dioxide in flue gas. Methods. Background technique [0002] At present, the method of ammonia removal of sulfur dioxide in flue gas mainly adopts the method of spray absorption, and the absorption process is mainly divided into two types: single-tower absorption and double-tower absorption. [0003] The earliest ammonia desulfurization absorption process developed abroad is in the form of double towers. At present, there are similar desulfurization devices in China. The traditional double-tower absorption device is composed of a concentration crystallization tower and an absorption tower connected in series. The flue gas first enters the concentrat...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D50/00B01D53/50B01D53/68B01D53/64
CPCY02C20/30
Inventor 殷兴华
Owner 赵加勇
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