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Flue gas desulfurization process

A process method and flue gas technology, applied in the field of ionic liquid solution, can solve the problems of slow mass transfer and high viscosity of ionic liquid, and achieve the effects of saving water resources, improving transportation and dispersing performance, and low cost of desulfurization

Inactive Publication Date: 2011-05-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of high viscosity and slow mass transfer of ionic liquids, most of the current literatures report the effect of ionic liquids on SO 2 absorption characteristics, while for ionic liquids to remove SO 2 The process has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example illustrates that the tetramethylguanidine lactate ionic liquid solution is used as the absorbent, and the packed tower is used as the absorption tower to absorb SO in the flue gas at 60°C and 0.1MPa. 2 craft.

[0038] Tetramethylguanidine lactate was formulated into an aqueous solution with a mass fraction of 50%. The flue gas from the coal-fired boiler, after dust removal treatment, the flue gas temperature is 150°C, SO 2 The content is 2150mg / m 3 , cooled to 60°C, and sent to the absorption tower, the pressure in the absorption tower is 0.1MPa. The ratio of the amount of ionic liquid solution to the flue gas flow rate is 1:1000 (V / V), and the absorption tower is a packed tower with Raschig rings as fillers. The upper part of the absorption tower is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. Tail gas enters the absorption tower from the bottom air inlet and contacts with the...

Embodiment 2

[0040] This example shows that the ethanolamine lactate ionic liquid solution is used as the absorbent, and the conventional plate tower is used as the absorption tower to absorb SO in the flue gas at 60°C and 1.0MPa. 2 craft.

[0041] The ethanolamine lactate was formulated into an aqueous solution with a mass fraction of 90%. The tail gas from the boiler, after dust removal treatment, SO 2 The content is 2150mg / m 3 , cooling down to 60°C. In order to improve the absorption effect, the flue gas is boosted to 1.0MPa and sent into the absorption tower, and the pressure inside the absorption tower is 1.0MPa. The ratio of the amount of ionic liquid to the volume of flue gas flow is 1:60, and the absorption tower is a plate tower. The upper part of the absorption tower is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. The tail gas enters the absorption tower from the air inlet and contacts with the ion...

Embodiment 3

[0043] This example illustrates the use of 1-(1-aminopropyl)-3-methylimidazolium hexafluorophosphate ionic liquid solution as the absorbent, and the spray tower as the absorption tower to absorb flue gas at 70°C and 5.0MPa Medium SO 2 craft.

[0044] 1-(1-aminopropyl)-3-methylimidazolium hexafluorophosphate was formulated into an aqueous solution with a mass fraction of 95%. The tail gas from the boiler, after dust removal treatment, has a flue gas temperature of 150°C, SO 2 The content is 2150mg / m 3 , cooled to 70°C, pressurized and sent into the absorption tower, the pressure inside the absorption tower is 5.0MPa. The ratio of the amount of ionic liquid to the volume of the flue gas flow is 1:10. The absorption tower is a spray tower. The upper part of the absorption tower is a liquid inlet pipe, and the lower part is an air inlet with a gas distribution device. The tail gas enters the absorption tower from the air inlet and contacts with the ionic liquid solution for ...

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Abstract

The invention provides a flue gas desulfurization process employing an ionic liquid. In the process, the ionic liquid is used as an absorbent, different types of absorption towers are adopted to absorb SO2 in the flue gas at the temperature of 0-200 DEG C under the pressure of 0.09-5.0 MPa, wherein gas-liquid countercurrent contact is adopted, various types of towers are adopted to improve a mass transfer effect so as to realize the emission of flue gas reaching the standard. The ionic liquid after absorbing the SO2 is pumped into a desorber through a pump and is subjected to deabsorption by adopting a heating and / or decompressing method, and SO2 is recovered. The desorbed ionic liquid enters the absorption towers to be reused. The process provided by the invention can be used for effectively removing the SO2 in the flue gas and recovering the SO2.

Description

technical field [0001] The invention relates to a process method for flue gas desulfurization. Specifically, the present invention relates to a process for using ionic liquid solution in flue gas desulfurization. Background technique [0002] As we all know, coal accounts for about 70% of my country's primary energy consumption, and more than 80% of the raw coal is directly burned. The direct combustion of a large amount of coal produces SO 2 , NO 2 , NO, CO and other air pollutants, leading my country to become a typical soot-type pollution country, seriously restricting the sustainable development of my country's economy. [0003] SO 2 It is one of the main components of air pollutants and one of the main pollutants in coal-fired flue gas. It can endanger human health, and can form acid rain, which has a serious impact on the agricultural ecological environment and crop yield. Therefore, SO 2 Emission control has always been a key research direction in the fields of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 吴卫泽任树行
Owner BEIJING UNIV OF CHEM TECH
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