Ultrasonic desulfuration, denitration and dust removal method

Abstract

The invention discloses an ultrasonic desulfuration, denitration and dust removal method .The method includes the steps that smoke enters an ultrasonic device; an ultrasonic generator in the ultrasonic device generates ultrasonic waves to atomize desulfuration liquid entering the ultrasonic device, SO2 in the smoke is catalyzed and oxidized by the atomized desulfuration liquid at high speed to generate SO3, and SO3 and a desulfuration medium in the desulfuration liquid react; the smoke processed by the ultrasonic device is sucked in under the action of an air draft fan and is conveyed back into a smoke exhaust pipeline .Desulfuration efficiency can reach 95% or above, the denitration effect is achieved, and nitrogen oxides are reduced by 20% or above.

Description

technical field

[0001] The invention relates to methods for desulfurization, denitrification and dust removal. Background technique

[0002] Sulfur exists in the form of sulfide, sulfate and organic sulfur in coal. During the combustion of coal, some of the low-valence sulfides are directly oxidized to SO 3 , and form a stable sulfate; the other part is oxidized to SO 2 . This part of SO 2 Most of them can be combined with high temperature alkaline materials and O 2 A reaction occurs to form sulfates. The few remaining parts of SO 2 will enter the chimney. The sulfates produced by the reaction mainly include compounds such as potassium sulfate, sodium sulfate, and calcium sulfate. The melting temperatures of these compounds are 1074°C, 852°C, and 1397°C respectively. If there is a reducing atmosphere, sulfate minerals will regenerate SO under the reduction of CO and C 2 And dust, or when the temperature exceeds 1500 ° C, volatilization occurs and participates in int...

Examples

Embodiment 1

[0037] Such as figure 1 As shown, the methods of ultrasonic desulfurization, denitrification and dust removal are:

[0038] (1) The flue gas that has undergone electrostatic dust removal is sent to the ultrasonic device 3 through the fan 2, and the device for electrostatic dust removal of the flue gas is the waste gas treatment electrostatic precipitator 1 . The ultrasonic device 3 includes a housing 31, which has more than two flue gas passages 32, and each flue gas passage 32 is connected to a desulfurization liquid pool, and an ultrasonic generator (not shown) is installed on the desulfurization liquid pool. The desulfurization liquid storage tank 35 is connected by the pump 34, and the desulfurization liquid is filled in the desulfurization liquid storage tank 35. According to the weight ratio, the desulfurization liquid is composed of 8% calcium chloride, 3% white mud, 8% sodium hydroxide, 0.5% Barium oxide, 0.8% calcium oxide, 10% sodium oxide, 9% potassium permanganate...

Embodiment 2

[0065] The desulfurization solution of the present embodiment consists of 25% calcium chloride, 2% white mud, 4% sodium hydroxide, 1.2% barium oxide, 1% calcium oxide, 5% sodium oxide, 10% Potassium permanganate, 7% lithium peroxide, 9% ferrous sulfate heptahydrate, 23% water, 3% lithium hydroxide, 5% sodium fluorosilicate, 4% sodium carbonate and 0.8% of ethylenediamine phosphate. Others are the same as in Example 1.

Embodiment 3

[0067] The desulfurization solution of the present embodiment consists of 13.8% calcium chloride, 2.5% white mud, 6% sodium hydroxide, 0.8% barium oxide, 0.9% calcium oxide, 7% sodium oxide, 5% Potassium permanganate, 8% lithium peroxide, 11% ferrous sulfate heptahydrate, 25% water, 5% lithium hydroxide, 4% sodium fluorosilicate, 10% sodium carbonate and 1% of ethylenediamine phosphate. Others are the same as in Example 1.

technical field

[0001] The invention relates to methods for desulfurization, denitrification and dust removal. Background technique

[0002] Sulfur exists in the form of sulfide, sulfate and organic sulfur in coal. During the combustion of coal, some of the low-valence sulfides are directly oxidized to SO 3 , and form a stable sulfate; the other part is oxidized to SO 2 . This part of SO 2 Most of them can be combined with high temperature alkaline materials and O 2 A reaction occurs to form sulfates. The few remaining parts of SO 2 will enter the chimney. The sulfates produced by the reaction mainly include compounds such as potassium sulfate, sodium sulfate, and calcium sulfate. The melting temperatures of these compounds are 1074°C, 852°C, and 1397°C respectively. If there is a reducing atmosphere, sulfate minerals will regenerate SO under the reduction of CO and C 2 And dust, or when the temperature exceeds 1500 ° C, volatilization occurs and participates in int...

Examples

Embodiment 1

[0037] Such as figure 1 As shown, the methods of ultrasonic desulfurization, denitrification and dust removal are:

[0038] (1) The flue gas that has undergone electrostatic dust removal is sent to the ultrasonic device 3 through the fan 2, and the device for electrostatic dust removal of the flue gas is the waste gas treatment electrostatic precipitator 1 . The ultrasonic device 3 includes a housing 31, which has more than two flue gas passages 32, and each flue gas passage 32 is connected to a desulfurization liquid pool, and an ultrasonic generator (not shown) is installed on the desulfurization liquid pool. The desulfurization liquid storage tank 35 is connected by the pump 34, and the desulfurization liquid is filled in the desulfurization liquid storage tank 35. According to the weight ratio, the desulfurization liquid is composed of 8% calcium chloride, 3% white mud, 8% sodium hydroxide, 0.5% Barium oxide, 0.8% calcium oxide, 10% sodium oxide, 9% potassium permanganate...

Embodiment 2

[0065] The desulfurization solution of the present embodiment consists of 25% calcium chloride, 2% white mud, 4% sodium hydroxide, 1.2% barium oxide, 1% calcium oxide, 5% sodium oxide, 10% Potassium permanganate, 7% lithium peroxide, 9% ferrous sulfate heptahydrate, 23% water, 3% lithium hydroxide, 5% sodium fluorosilicate, 4% sodium carbonate and 0.8% of ethylenediamine phosphate. Others are the same as in Example 1.

Embodiment 3

[0067] The desulfurization solution of the present embodiment consists of 13.8% calcium chloride, 2.5% white mud, 6% sodium hydroxide, 0.8% barium oxide, 0.9% calcium oxide, 7% sodium oxide, 5% Potassium permanganate, 8% lithium peroxide, 11% ferrous sulfate heptahydrate, 25% water, 5% lithium hydroxide, 4% sodium fluorosilicate, 10% sodium carbonate and 1% of ethylenediamine phosphate. Others are the same as in Example 1.

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