Method for removing and reclaiming sulfur dioxide from gas by low power consumption renewable absorbent
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An absorbent and gas technology, applied in the field of removing and recovering sulfur dioxide, can solve problems such as loss of organic amines, large investment, and reduced absorption effect.
Inactive Publication Date: 2010-12-22
北京金源化学集团有限公司
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However, due to the high price of organic amines, the investment in this method is relatively large, and at the same time, organic amines have a significant effect on SO 2 The number of moles absorbed is relatively large. Although the absorbent can be recycled, it needs to consume a lot of steam, generally 1 ton of SO 2 The steam consumption is greater than 10 tons
In addition, the organic amine absorbent absorbs SO 2 In
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Embodiment 1
[0055] A certain 2Ot / h chain furnace boiler exhaust, SO 2 The content is 2000-5000ppm, and the temperature is 150°C. After a part of the flue gas is drawn from it into the absorption tower, it is first sprayed and washed to remove the dust and SO 3 and cool down, and then enter the absorption section, the SO in the flue gas 2 Absorbed by absorbent A, the gas is discharged from the top of the absorption tower to absorb SO 2 The final solution B has a pH value of 2.5-2.8, then enters the reactor, adds absorbent C to a pH value of 5.5-6.0, and the reaction temperature is 50°C, and then washes and separates to obtain a precipitate and solution D, and the precipitate is regenerated Absorbent A, the concentration of inorganic alkali and double salt in the original absorbent A and water are beaten by a slurry pump, and then enter the absorption tower for recycling, and the solution D is introduced into the desorption device, and SO is obtained by steam desorption. 2 Gas and regene...
Embodiment 2
[0061] As the conditions in Example 1, the difference is:
[0062] Absorbent A component: 10% by mass Mg(OH) 2 , 5% by mass of basic magnesium sulfite, 0.1% by mass of sulfur, and the rest being water;
[0063] The composition of absorbent C is: 80% by mass of tetraethylenepentamine, 0.2% by mass of magnesium thiosulfate, and the rest is water;
[0064] Its operating data is as follows:
[0065]
Embodiment 3
[0067] As the conditions in Example 1, the difference is:
[0068] Absorbent slurry A component: 15% by mass of Mg(OH) 2 , 5 mass% MgSO 3 , 0.15% by mass of p-phenylenediamine, the rest being water;
[0069] The composition of absorbent C is: 50% by mass of triethylenetetramine, 10% by mass of hydroxyethylethylenediamine, 0.1% by mass of sulfur, and the rest is water;
[0070] Its operating data is as follows:
[0071]
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Abstract
The invention relates to a method for removing and reclaiming sulfur dioxide from a mixed gas by a renewable absorbent, which is characterized by comprising the following steps: adopting an absorbent to contact with a gas containing sulfur dioxide, and removing the sulfur dioxide in the gas, wherein the absorbent comprises the components as follows by mass concentration: 10-30% of inorganic base and/or complex salt thereof and/or sulfite thereof, 0.02-0.2% of antioxidant and water; after absorbing the sulfur dioxide, reacting a solution containing the sulfur dioxide with another organic amine absorbent, and transferring the sulfur dioxide in the organic amine absorbent, thereby obtaining a renewable absorbent for removing the sulfur dioxide in air current repeatedly, wherein the organic amine absorbent comprises the following components by mass concentration: 30-98% of organic amine, 0.0-0.2% of antioxidant and water; and desorbing the organic amine absorbent containing the sulfur dioxide to obtain a high concentration sulfur dioxide gas and a renewable organic amine absorbent. The method for absorbing and reclaiming the sulfur dioxide proposed by the invention can realize cycled regeneration and utilization of the absorbent, and has no secondary pollution in the use process, low power consumption and low operation cost.
Description
technical field [0001] The invention relates to a method for removing and recovering sulfur dioxide (SO 2 )Methods. Background technique [0002] SO 2 It is the main pollutant of air pollution in my country, with an annual emission of more than 20 million tons, and its main source is a large amount of low-concentration SO produced in the fields of metallurgy, thermal power, thermoelectricity and chemical industry 2 flue gas, so the SO in the flue gas 2 Governance is to reduce SO 2 The main measure of pollution. [0003] In the existing desulfurization process, the use of absorbents to directly absorb and remove SO from flue gas 2 It is one of the most effective methods. According to the different absorbents currently used, it is mainly divided into the following two categories: [0004] One is the inorganic alkali method, including: the calcium method based on lime and limestone, the magnesium method based on magnesium oxide, the sodium method based on sodium carbonate...
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