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Desulfurization method for purifying flue gas

A flue gas purification and flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high regeneration energy consumption, easy generation of side reactions, and high liquid-gas ratio

Active Publication Date: 2014-07-30
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the limestone gypsum method, these desulfurization technologies have advantages in some aspects, such as low material consumption in operation, by-products can be recycled and reused, and secondary pollution is not obvious; however, these technologies also have certain problems: (1 ) The solvent is highly corrosive, (2) the liquid-to-gas ratio is high, (3) side reactions are prone to occur, (4) regeneration energy consumption is high

Method used

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  • Desulfurization method for purifying flue gas
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  • Desulfurization method for purifying flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of ionic liquid:

[0045] Using different amine compounds, the elimination reactions were carried out under the following conditions: 60 °C, 24 h, 120 °C, 2 h, 100 °C, 6 h, 50 °C, 12 h, and the products were purified by vacuum distillation to obtain four different compounds. Use sulfuric acid or phosphoric acid to carry out neutralization reaction, and after concentrated treatment, carry out drying treatment under the following conditions: 25 ℃, 0.1 kPa, 12h, 120 ℃, 100 kPa, 10h, 65 ℃, 0.1 kPa, 12 h, 100 ℃, 0.1kPa, 2h. Ionic liquids 1, 2, 3, and 4 were obtained, respectively.

[0046] The ionic liquids 1, 2, 3, and 4 are uniformly mixed with an ionic solvent at a certain concentration to obtain different ionic solutions.

Embodiment 2

[0048] Use the desulfurization process in this patent to desulfurize the simulated gas:

[0049] For laboratory simulated gas, the gas flow is 1000 Nm 3 / h, where SO 2 Concentration is 16000 mg / Nm 3 , SO in purified gas after desulfurization 2 The concentration is 124 mg / Nm 3 , The desulfurization efficiency is 99.2%.

Embodiment 3

[0051] Use the desulfurization process in this patent to desulfurize the simulated gas:

[0052] For laboratory simulated gas, the gas flow is 1000 Nm 3 / h, where SO 2 At a concentration of 3000 mg / Nm 3 , SO in purified gas after desulfurization 2 The concentration is 14 mg / Nm 3 , The desulfurization efficiency is 99.5%.

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Abstract

The invention relates to a desulfurization method for purifying flue gas. The desulfurization method comprises the following steps: removing ash, dust, fluorine, chlorine and bromine which are possibly contained in the flue gas from the flue gas by passing through a pre-washing tower; absorbing sulfur dioxide in purified gas through a desulfurizer barren solution by passing through an absorption tower; converting the barren solution into a pregnant solution, wherein the gas out from the absorption tower meets a waste gas emission standard; performing thermal desorption on the pregnant solution after the pregnant solution exchanges heat with barren solution out from a desorption tower; and releasing the sulfur dioxide in the pregnant solution, wherein mixed gas out from the desorption tower can be used as a chemical raw material after being dewatered, the desulfurizer is an ionic solution which contains an ionic liquid and an ionic solvent. According to the sulfur dioxide removal process which takes the ionic solution as a cycle gas cleaning solvent, the equipment corrosion can be reduced, the solvent consumption amount is reduced, the power consumption is reduced, and the operating cost is reduced. The ionic solution can adsorb a large amount of sulfur dioxide, and is easy to desorb and high in recycling stability.

Description

technical field [0001] The invention relates to a desulfurization method for flue gas purification, which belongs to the field of gas purification. technical background [0002] The main source of air pollution is industrial waste gas emissions, the most important sources include power plant flue gas, furnace flue gas, steelmaking tail gas, and non-ferrous metal smelting tail gas. Among them, SO 2 is the largest pollutant. At present, domestic thermal power plants generally adopt limestone-gypsum wet desulfurization process. This technology is mature, efficient, reliable, and easy to operate. The desulfurization efficiency can reach more than 99% by using the double-cycle process, but the abrasion and blockage of equipment and pipelines are serious. ; Especially for coal with high sulfur content, the transportation, storage and treatment of desulfurization raw materials and by-products are very difficult. [0003] With the development of desulfurization technology, a new ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 梅雪刘科伟钟洪玲张鑫孟辉
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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