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Ozone-hydroxy free radical dry-wet combined desulphurization and denitration technology

A technology of desulfurization and denitrification combined with dry and wet, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as few cases, and achieve the effect of preventing pollution and preventing corrosion

Active Publication Date: 2015-05-06
ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the flue gas desulfurization and denitrification of small and medium-sized boilers and glass furnaces, although there have been many literature reports, there are not many practical application cases

Method used

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  • Ozone-hydroxy free radical dry-wet combined desulphurization and denitration technology
  • Ozone-hydroxy free radical dry-wet combined desulphurization and denitration technology
  • Ozone-hydroxy free radical dry-wet combined desulphurization and denitration technology

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Company 1 has a flue gas volume of 45,000 m 3 / h, flue gas component SO 2 3000mg / m 3 NO1100mg / m 3 , the remainder is O 2 , nitrogen and water vapor. The flue gas temperature is 70°C and the pressure is 1 atmosphere. Ozone / NO≈0.95 (molar ratio), H 2 SO 4 Concentration 5%, FeSO 4 0.1% (weight percent), H 2 o 2 The concentration is 28% (percentage by weight). After implementing the patented ozone-hydroxyl radical dry-wet combined desulfurization and denitrification process of the present invention, the SO 2 The concentration is 50mg / m 3 , NOx is 80mg / m 3 , The average desulfurization and denitrification rate is above 90%. Discharge 12 tons of acid medium wastewater every three months.

Embodiment 2

[0029] Example 2: Company 2 has a flue gas volume of 15,000 m 3 / h, the flue gas composition is as follows: SO 2 2700mg / m 3 , NOx760mg / m 3 , and the rest are N 2 , CO 2 and water vapor, the flue gas temperature is 75°C, the pressure is 1 atmosphere, and the amount of ozone is 0.94 , 0.1%H 2 o 2 20%, exhaust NOx reduced to 75mg / m after treatment by this process 3 , SO 2 down to 45mg / m 3 , desulfurization and denitrification reached over 90%. 4 tons of acidic medium wastewater is discharged about every three months.

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Abstract

The invention belongs to the technical field of treatment on sulphur oxides and nitrogen oxides in flue gas and discloses an ozone-hydroxy free radical dry-wet combined desulphurization and denitration technology. The desulphurization and denitration technology comprises the following steps of carrying out dry or wet dedusting on flue gas to be treated so that a temperature is less than 80 DEG C and dust content of the flue gas of each cubic meter is less than 120mg, feeding gaseous ozone into the flue gas to be treated, feeding the flue treated by gaseous ozone into a H2SO4 solution with a catalyst FeSO4, and carrying out H2O2 cycle spraying along a direction opposite to a flue gas feeding direction. The produced OH.(hydroxy free radical) can remove NO2 and SO2 in flue gas, a SO2 removal rate is 98% or more and a denitration rate is 90% or more. Excess ozone is reduced into O2 by H2O2 so that ozone-caused atmosphere environment pollution is prevented. An oxidation reaction temperature is controlled to 80 DEG C or more so that equipment is effectively controlled and air channel corrosion problems are solved. A dry ozone oxidation method is used so that equipment corrosion is prevented.

Description

technical field [0001] The invention belongs to the technical field of treating sulfur oxides and nitrogen oxides in flue gas, and is a desulfurization and denitrification process combining dry and wet ozone-hydroxy radicals. Background technique [0002] Flue gas desulfurization and denitrification is already one of the projects that the Ministry of Environmental Protection of my country strongly requires enterprises to carry out environmental protection management. As we all know, sulfur oxides in flue gas are mainly SO2, and nitrogen oxides are mainly NO (accounting for 90%-95% of nitrogen oxides, NO 2 only 5-10%), a small amount of O2. Boiler flue gas volume is large, and NO is insoluble in water, which brings difficulties to flue gas desulfurization and denitrification. [0003] The existing lime-gypsum method and double-alkali method in my country are only used for flue gas desulfurization. Magnesium oxide method, ammonia method, urea method, etc., although desulfur...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/86B01D53/76B01D53/60
CPCY02A50/20
Inventor 李惠林侯惠奇何坚
Owner ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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