Wet flue gas desulfurization method

A wet flue gas desulfurization and flue gas technology, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of long desulfurization absorption liquid treatment process, inability to be recycled, and large consumption of compressed air. Achieve the effect of saving equipment investment and operating costs, reducing processing costs, and reducing investment

Active Publication Date: 2009-12-30
JINLONG COPPER
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Problems solved by technology

The disadvantage of this method is that the treatment process of the desulfurization absorption liquid is long and the equipment investment is high; it needs to consume a large amount of compressed air for oxidation, and the operating cost is high; the SO absorbed from the flue gas 2 It cannot be recycled; when the oxidation efficiency is not high, the wastewater contains unoxidized sulfite, which will cause secondary pollution

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  • Wet flue gas desulfurization method

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Embodiment Construction

[0008] Such as figure 1 As shown, the absorption liquid in the absorption tower 2 is supplemented by the storage tank 14. The flue gas from the pipeline 5 is in contact with the circulating absorption liquid from the absorption tower 2 in the reverse nozzle 3, and the SO in the flue gas 2 React with the absorption liquid, the generated sulfite is dissolved or suspended in the absorption liquid, the dust in the flue gas is washed by the absorption liquid, and suspended in the absorption liquid; the flue gas after desulfurization and dust removal is discharged to the tail gas from the pipe 5 to the chimney , the purified water required by the reverse nozzle 3 is transported by the pipeline 4, and the pipeline 7 transports the flushing water to the absorption tower 2. A part of the circulating absorption liquid in the absorption tower 2 is sent to the purification settling tank 11 in the acid system through the pipeline 1 to react with the waste acid containing 5-15% sulfuric ac...

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Abstract

The invention discloses a wet flue gas desulfurization method comprising the steps: obtaining absorption liquid with sulphite by using an alkaline absorbing agent which is in contact with flue gas to absorb SO2 in the flue gas in a desulfurizing tower; reacting the obtained absorption liquid containing sulphite with sulphuric acid; transmitting the SO2 precipitated by the reaction to an acid preparation system to prepare the sulphuric acid; and obtaining a solid settling matter of sulphate by soil-liquid collecting reaction. The wet flue gas desulfurization method can use sulphuric acid in waste acid to treat the absorption liquid, shortens a treating process and saves a large amount of device investment and operation cost, and the SO2 absorbed from the flue gas enters the acid preparation system again, therefore, resources can be recycled.

Description

technical field [0001] The invention relates to a wet flue gas desulfurization method. Background technique [0002] At present, the traditional wet calcium method, sodium method and magnesium method desulfurization process all use magnesium oxide, sodium hydroxide or calcium hydroxide solution (or slurry) as the absorbent, and the SO in the flue gas in the desulfurization tower 2 React to generate sulfite, then send the sulfite-containing absorption liquid into the oxidation tower to oxidize with compressed air to produce sulfate, settle and filter for solid-liquid separation, and finally send it to waste water for treatment or discharge. The disadvantage of this method is that the treatment process of the desulfurization absorption liquid is long and the equipment investment is high; it needs to consume a large amount of compressed air for oxidation, and the operating cost is high; the SO absorbed from the flue gas 2 It cannot be recycled; when the oxidation efficiency is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/80
Inventor 梁海卫汪卫东
Owner JINLONG COPPER
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