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Flue gas desulfurization method

A flue gas and desulfurization tower technology, applied in the field of flue gas desulfurization, can solve the problems of low desulfurization efficiency

Inactive Publication Date: 2017-01-04
HEFEI HEYI ENVIRONMENTAL PROTECTION TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More than 90% of China's thermal power plants and steel mills use wet limestone-gypsum flue gas desulfurization process, but the desulfurization efficiency of the above method is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The flue gas is first passed into the first desulfurization tower, the desulfurization agent in the first desulfurization tower is methyl aniline, the desulfurization temperature is 60°C, and the flow rate of the flue gas is 1000m 3 / h, the flow rate of methylaniline is 30m 3 / h; and store the treated flue gas in the gas storage tank. The flue gas in the gas storage tank is passed into the second desulfurization tower, the second desulfurization tower is equipped with activated carbon with a pore size of 1.5nm, the desulfurization temperature is 30°C, and the flue gas flow rate is 110m 3 / h, the replacement frequency of activated carbon is 2 times / h and the treated flue gas is stored in the gas storage tank. Finally, the gas in the processing pipe is passed into the third desulfurization tower, the desulfurization agent in the third desulfurization tower is sodium hydroxide solution, the mass ratio of sodium hydroxide to water in the sodium hydroxide solution is 3:1, an...

Embodiment 2

[0048] The flue gas is first passed into the first desulfurization tower, the desulfurizer in the first desulfurization tower is monoethanolamine, the desulfurization temperature is 50°C, and the flow rate of the flue gas is 1300m 3 / h, the flow rate of monoethanolamine is 80m 3 / h; and store the treated flue gas in the gas storage tank. The flue gas in the gas storage tank is passed into the second desulfurization tower, the second desulfurization tower is equipped with limestone with a pore size of 0.8nm, the desulfurization temperature is 50°C, and the flue gas flow rate is 145m 3 / h, the replacement frequency of limestone is 3 times / h and the treated flue gas is stored in the gas storage tank. Finally, the gas in the processing pipe is passed into the third desulfurization tower. The desulfurization agent in the third desulfurization tower is sodium carbonate solution. The mass ratio of sodium carbonate to water in the sodium carbonate solution is 6:1, and the desulfuriza...

Embodiment 3

[0051] The flue gas is first passed into the first desulfurization tower, the desulfurizers in the first desulfurization tower are monoethanolamine and diethanolamine, the desulfurization temperature is 80°C, and the flow rate of flue gas is 1500m 3 / h, the flow rate of monoethanolamine and diethanolamine is 50m 3 / h; and store the treated flue gas in the gas storage tank. The flue gas in the gas storage tank is passed into the second desulfurization tower, the second desulfurization tower is equipped with activated carbon and iron oxide with a pore size of 1nm, the desulfurization temperature is 40°C, and the flue gas flow rate is 160m 3 / h, the replacement frequency of activated carbon and iron oxide is 4 times / h and the treated flue gas is stored in the gas storage tank. Finally, the gas in the processing pipe is passed into the third desulfurization tower, the desulfurizing agent in the third desulfurization tower is basic aluminum sulfate solution, the mass ratio of basi...

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Abstract

The invention discloses a flue gas desulfurization method. The flue gas desulfurization method comprises the steps that firstly, flue gas passes through a first desulfurization tower, a second desulfurization tower and a third desulfurization tower in sequence for desulfurization; a desulfurization agent in the first desulfurization tower is an organic amine desulfurization agent; a solid desulfurization agent with the bore diameter being 0.4-3 nm is arranged in the second desulfurization tower; a desulfurization agent in the third desulfurization tower is an alkaline liquid desulfurization agent. According to the flue gas desulfurization method, the organic amine desulfurization agent, the solid desulfurization agent with the bore diameter being 0.4-3 nm and the alkaline liquid desulfurization agent are adopted to carry out desulfurization treatment on flue gas in sequence, and thus SO2 in gas out of the third desulfurization tower can meet the GB13271-2001 national standard and the GB13223-2011 national standard. Experiment results show that the desulfurization efficiency of the flue gas desulfurization method is 97.5% or above.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to a method for flue gas desulfurization. Background technique [0002] Sulfur dioxide is a poisonous gas that easily dissolves in blood and other viscous fluids of the human body, causing great harm to the human body. Studies have shown that under the influence of high concentrations of sulfur dioxide, necrotic spots appear on the surface of plant leaves, or directly cause plant leaves to wither and fall off; under the influence of low concentrations of sulfur dioxide, the growth function of plants is affected, resulting in a decline in yield. Moreover, sulfur dioxide has a corrosive effect on metals, which brings great losses to the national economy every year. It is estimated that the direct economic loss caused by metal corrosion in industrialized countries accounts for 2% to 4% of the total output value of the national economy every year. It can be seen from the above ...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/14B01D53/78B01D53/50
CPCB01D53/04B01D53/1481B01D53/1493B01D53/502B01D2251/304B01D2251/404B01D2251/604B01D2251/606B01D2251/608B01D2252/204B01D2253/10B01D2253/102B01D2253/1124B01D2258/0283
Inventor 汪为忠
Owner HEFEI HEYI ENVIRONMENTAL PROTECTION TECH ENG