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Purification treatment method and system for desulfurization, denitrification and dust removal of charged gas mist by electrostatic cyclone separation

An electrostatic cyclone, desulfurization and denitrification technology, applied in the direction of separation methods, gas treatment, chemical instruments and methods, etc., can solve the problems of reduced dust removal efficiency, complicated operation, large investment, etc., to achieve reduced industrial energy consumption, simple operation process, The effect of low investment cost

Active Publication Date: 2018-09-21
李晋蓉 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the denitrification methods, the denitrification efficiency of SNCR is only 30% to 50%, which cannot meet the increasingly stringent environmental protection requirements. NH 3 -Although the denitrification efficiency of SCR reaches 80-90%, the investment is large, the catalyst cost is high, and it is easy to generate ammonia escape and cause secondary pollution
There are also many problems in the traditional dust removal device. For example, the electrostatic precipitator is easy to raise dust again during the dust removal process, and the dust removal efficiency is reduced; It is easy to stick to the surface of the bag, increasing the pressure drop of the system and reducing the dust removal efficiency; and in order to avoid steam condensation, it is necessary to increase the temperature of the exhaust gas, resulting in energy waste
In addition, although the bag filter has a good removal effect on dust particles with a larger particle size, it has little effect on fine particles, especially PM2.5 with a particle size of less than 2.5 μm.
In addition, separate desulfurization, denitrification and dust removal require multiple sets of equipment and the combination of different processes, resulting in large investment, large floor area and other problems, and the operation is complicated and easy to interfere with each other, which affects the use effect

Method used

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  • Purification treatment method and system for desulfurization, denitrification and dust removal of charged gas mist by electrostatic cyclone separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The dust concentration is 200mg / m 3 (where PM2.5 is 500μg / m 3 ), the concentration of nitrogen oxides is 400ppm, and the concentration of sulfur dioxide is 600ppm. The function is to oxidize the NO in it into soluble nitrogen oxides, atomize the water into a fine water mist that can be mixed with dust, and then use the charged water mist generator 1 to charge the opposite charge to the dust-containing charged industrial waste gas to form a charged water mist. The charging voltage is 1KV, and the charged water mist and dust-containing charged industrial waste gas are placed in the charged aerosol mixing reactor 3 so that the ratio of fine water mist to industrial waste gas (fog ratio) is 0.001L / m 3 Mixing occurs and condenses to form a gas phase, a dusty solid-liquid phase and a sedimentation liquid. The sedimentation liquid containing a part of a larger size deposits and condenses on the inner wall of the mixing chamber, and is discharged from the bottom to the liquid ...

Embodiment 2

[0036] Dust concentration is 100mg / m 3 (where PM2.5 is 200μg / m 3 ), the concentration of nitrogen oxides is 300ppm, the concentration of nitrogen oxides is 300ppm, and the concentration of sulfur dioxide is 400ppm. The action of ozone oxidizes NO in it into soluble nitrogen oxides, atomizes water into fine water mist that can be mixed with dust, and then uses charged water mist generator 1 to charge the opposite charge to dust-containing charged industrial waste gas to form charged water Fog, the charging voltage is 100KV, the charged water mist and dust-containing charged industrial waste gas are placed in the charged aerosol mixing reactor 3, and the ratio of fine water mist to industrial waste gas (fog ratio) is 0.2L / m 3 Mixing occurs and condenses to form a gas phase, a dusty solid-liquid phase and a sedimentation liquid. The sedimentation liquid containing a part of a larger size deposits and condenses on the inner wall of the mixing chamber, and is discharged from the b...

Embodiment 3

[0038] Dust concentration is 150mg / m 3 (where PM2.5 is 600μg / m 3 ), the concentration of nitrogen oxides is 350ppm, and the concentration of sulfur dioxide is 500ppm. The function is to oxidize the NO in it into soluble nitrogen oxides, atomize the water into a fine water mist that can be mixed with dust, and then use the charged water mist generator 1 to charge the opposite charge to the dust-containing charged industrial waste gas to form a charged water mist. The charging voltage is 10KV, and the charged water mist and dust-containing charged industrial waste gas are placed in the charged aerosol mixing reactor 3 so that the ratio of fine water mist to industrial waste gas (fog ratio) is 0.008L / m 3 Mixing occurs and condenses to form a gas phase, a dusty solid-liquid phase and a sedimentation liquid. The sedimentation liquid containing a part of a larger size deposits and condenses on the inner wall of the mixing chamber, and is discharged from the bottom to the liquid cir...

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Abstract

The invention discloses a static cyclone separation charged aerosol desulphurization denitration dedusting purification treatment method, which comprises the following steps: a, atomizing water to water mist which can be mixed with dust and charging to form charged water mist, charging dust-containing industrial waste gas with charge opposite to change of the charged water mist so as to form dust-containing charged industrial waste gas; b, mixing the charged water mist and the dust-containing charged industrial waste gas to form a mixed system containing a gas phase and a dust-containing solid-liquid phase, preliminarily separating the dust-containing solid-liquid phase in the mixed system by the utilization of gravity; c, carrying out static cyclone separation on the mixed system preliminarily separated in the step b so as to form a clean air phase and the rest dust-containing solid-liquid phase; and simultaneously removing gaseous pollutants such as sulfur dioxide and nitrogen oxide and the like in the industrial waste gas and particulate pollutants by a desulphurization denitration dedusting integrative technology. The method has the best effect of removing especially fine particulate matters of PM2.5 and below. Removal efficiency can reach up to 98% and above, and removal efficiency of removing acid gases such as sulfur dioxide, nitrogen oxide and the like in the waste gas can reach 95% and above.

Description

technical field [0001] The invention relates to the field of industrial waste gas purification, in particular to a purification treatment method and system for desulfurization, denitrification and dust removal of charged aerosol by electrostatic cyclone separation. Background technique [0002] my country is a large energy consumption country. After the combustion of fossil fuels, a large amount of industrial waste gas is emitted. The acid gases such as sulfur dioxide and nitrogen oxides contained in industrial waste gas and fine particle dust cause smog, acid rain, enhanced greenhouse effect and ozone layer damage to the environment. The desulfurization, denitrification and dust removal of existing industrial waste gas generally adopt separate treatment methods: desulfurization mainly adopts limestone-gypsum wet method; nitrogen oxides are removed by NH 3 -SCR and SNCR dry denitrification technologies are mainly used; dust removal is mainly based on electrostatic precipitat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D50/00B01D53/32
CPCB01D50/00B01D53/323B01D2259/818Y02A50/20Y02A50/2351
Inventor 李晋蓉秦瑞香
Owner 李晋蓉