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Method for removing various pollutants in fume by combining discharge plasmas and absorption

A technology for discharging plasma and pollutants, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation. It can solve problems such as ineffective oxidation, and achieve the effect of low investment and operating costs.

Active Publication Date: 2010-06-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is based on the authorized announcement or published patent technology, aiming at the problem that NO preferentially consumes the plasma generated by the discharge, so that the elemental Hg contained in the flue gas cannot be effectively oxidized, and proposes a new coal-fired or incinerated Combined removal method of multiple pollutants in flue gas, at the same time, this method can effectively prevent various mist particles and ammonia from escaping

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  • Method for removing various pollutants in fume by combining discharge plasmas and absorption
  • Method for removing various pollutants in fume by combining discharge plasmas and absorption

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The simulated flue gas temperature in the laboratory is 60°C, containing 2800mg / m 3 SO 2 , 560mg / m 3 NO x , 150μg / m 3 Mercury with a flow rate of 12m 3 / h. Firstly, in the pre-washing tower 3, the sodium sulfate aqueous solution with a concentration of 2.8M from the primary absorption tower 5 is used for pre-washing, and then pass through the primary discharge plasma reactor 4 and the primary absorption tower 5 respectively. The initial absorption liquid of the primary absorption tower 5 is prepared with industrial grade caustic soda and water, and the pH value of the circulating absorption liquid is maintained at 7-7.5. After being discharged from the primary absorption tower 5, the SO in the flue gas 2 , NO x and mercury concentrations were reduced to 120mg / m 3 , 130mg / m 3 and 128 μg / m 3 . Then, the flue gas passes through the secondary discharge plasma reactor 6 and the secondary absorption tower 7 in sequence. The initial absorption liquid of the seconda...

Embodiment 2

[0051] The simulated flue gas temperature in the laboratory is 60°C, containing 3100mg / m 3 SO 2 , 545mg / m 3 NO x , 140μg / m 3 Mercury with a flow rate of 12m 3 / h. Utilize the mixed aqueous solution of ammonium sulfate and ammonium bisulfate from the primary absorption tower 5, the concentration is 2.6M to pre-wash in the pre-washing tower 3, then pass through the primary discharge plasma reactor 4 and the primary absorption tower 5 respectively. The initial absorption liquid of the primary absorption tower 5 is prepared by adding industrial ammonium water to maintain the pH value of the circulating absorption liquid at 6.3-6.8. After being discharged from the primary absorption tower 5, the flue gas SO 2 , NO x and mercury concentrations were reduced to 173mg / m 3 , 210mg / m 3 and 122 μg / m 3 . Then, the flue gas passes through the secondary discharge plasma reactor 6 and the secondary absorption tower 7 in sequence. The initial absorption liquid of the secondary coll...

Embodiment 3

[0053] The actual coal-fired flue gas 3000m is led out from the flue gas conveying pipe after bag dust removal treatment 3 / h, the flue gas temperature is 85°C, containing 2580mg / m 3 SO 2 , 516mg / m 3 NO x , 102μg / m 3 Mercury, 88mg / m 3 fine particles. In the pre-washing tower 3, the mixed aqueous solution of ammonium sulfate and ammonium bisulfate from the primary absorption tower 5 with a concentration of 2.9M is used for pre-washing, and then pass through the primary discharge plasma reactor 4 and the primary absorption tower 5 respectively. The initial absorption liquid of the primary absorption tower 5 is prepared by adding industrial ammonium water to maintain the pH value of the circulating absorption liquid at 6.3-6.8. , after being discharged from the primary absorption tower 5, the flue gas SO 2 , NO x , mercury and fine particulate matter concentrations were reduced to 245mg / m 3 , 160mg / m 3 , 91 μg / m 3 and 40mg / m 3 . Then, the flue gas passes through the ...

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Abstract

The invention discloses a method for removing various pollutants in fume by combining discharge plasmas and absorption. The method comprises the following steps: electrically dedusting or dedusting fire coal or burning fume by a cloth bag; and sequentially pumping the fume through a pre-washing tower, a primary discharge plasma reactor, a primary absorption tower, a secondary discharge plasma reactor and a secondary absorption tower, wherein the pre-washing tower is used for pre-cleaning the fume, lowering the temperature and condensing the absorption liquid; the primary discharge plasma reactor is used for oxidizing NO, charging thin particulate matter, trapping and removing; the primary absorption tower is used for washing and removing SO2, NOx and charged thin particulate matter; the secondary discharge plasma reactor is used for oxidizing an element Hg, charging acid mist and ammonium mist, trapping and removing; and the secondary absorption tower is used for washing and removing oxidized Hg and other pollutants. By the treatment, the removal rates of the SO2, the NOx, the Hg and the thin particulate matter respectively reach above 95%, 75%, 75% and 80%; and the leakage amountof ammonia is below 5mg / m<3>.

Description

technical field [0001] The invention relates to a method for purifying various pollutants in coal combustion and incineration flue gas, which belongs to the field of environmental protection, and more specifically relates to a method for removing SO in flue gas by combining discharge plasma and absorption 2 , NO x , Hg and fine particulate matter and other pollutants. Background technique [0002] Pollutants contained in coal combustion and incineration flue gas include soot, SO 2 , NO x and Hg et al. The traditional treatment method is that one treatment system corresponds to one pollutant. The mainstream technologies include electrostatic precipitator or bag filter to remove soot, limestone / gypsum to remove SO 2 , Selective catalytic reduction to remove NO x , Activated carbon adsorption and separation of Hg, etc. Although these treatment methods have the advantages of high purification efficiency, mature and reliable technology, etc., they have high equipment invest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75
CPCY02A50/20
Inventor 朱天乐王美艳罗宏晶孙轶斐
Owner BEIHANG UNIV
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