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Device and method for recovering and reusing sulfur dioxide in flue gas

A sulfur dioxide and reuse technology, applied in the field of flue gas desulfurization, can solve problems such as equipment corrosion and secondary pollution of flue gas desulfurization technology, and achieve the effect of low cost, high industrial practical value, and pollution reduction

Pending Publication Date: 2022-04-05
武钢资源集团乌龙泉矿业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a device and method for recovering and reusing sulfur dioxide in flue gas, aiming to solve the problems of secondary pollution and equipment corrosion in flue gas desulfurization technology in the prior art

Method used

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  • Device and method for recovering and reusing sulfur dioxide in flue gas

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Experimental program
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Effect test

Embodiment 1

[0056] S1, cooling the flue gas to 60°C;

[0057] S2, passing the cooled flue gas into a supersaturated sodium dihydrogen phosphate solution with a concentration of 110g / L for full absorption to obtain mother liquor and residual gas;

[0058] S3, adding 0.5mol / L ethylenediaminetetraacetic acid to the obtained mother liquor and the remaining gas to react to obtain a reaction solution;

[0059] S4, cooling the reaction solution to 25°C, depositing ethylenediaminetetraacetic acid solids and producing gas;

[0060] S5, passing the precipitated ethylenediaminetetraacetic acid solid into the supersaturated sodium dihydrogen phosphate solution in the step S120, and passing the SO produced in the step S140 2 The gas is passed into solid sodium carbonate to obtain sodium sulfite product.

Embodiment 2

[0062] S1, cooling the flue gas to 80°C;

[0063] S2, passing the cooled flue gas into a supersaturated sodium dihydrogen phosphate solution with a concentration of 180g / L for full absorption to obtain mother liquor and residual gas;

[0064] S3, adding 0.5mol / L ethylenediaminetetraacetic acid to the obtained mother liquor and the remaining gas to react to obtain a reaction solution;

[0065] S4, cooling the reaction solution to 25°C, depositing ethylenediaminetetraacetic acid solids and producing gas;

[0066] S5, passing the precipitated ethylenediaminetetraacetic acid solid into the supersaturated sodium dihydrogen phosphate solution in the step S120, and passing the SO produced in the step S140 2 The gas is passed into solid sodium carbonate to obtain sodium sulfite product.

Embodiment 3

[0068] S1, cooling the flue gas to 100°C;

[0069] S2, passing the cooled flue gas into a supersaturated sodium dihydrogen phosphate solution with a concentration of 240g / L for full absorption to obtain mother liquor and residual gas;

[0070] S3, adding 0.5mol / L ethylenediaminetetraacetic acid to the obtained mother liquor and the remaining gas to react to obtain a reaction solution;

[0071] S4, cooling the reaction solution to 25°C, depositing ethylenediaminetetraacetic acid solids and producing gas;

[0072] S5, passing the precipitated ethylenediaminetetraacetic acid solid into the supersaturated sodium dihydrogen phosphate solution in the step S120, and passing the SO produced in the step S140 2 The gas is passed into solid sodium carbonate to obtain sodium sulfite product.

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Abstract

The embodiment of the invention relates to a device and a method for recycling and reusing sulfur dioxide in flue gas. The method comprises the following steps: step S110, cooling the flue gas to a preset temperature; s120, the cooled flue gas is introduced into a supersaturated sodium dihydrogen phosphate solution to be fully absorbed, and mother liquor and residual gas are obtained; step S130, adding ethylenediaminetetraacetic acid into the obtained mother liquor and residual gas, and reacting to obtain a reaction solution; cooling the reaction solution to room temperature, separating out solid and producing gas; and step S150, introducing the separated solid into the supersaturated sodium dihydrogen phosphate solution in the step S120, and introducing the gas produced in the step S140 into solid sodium carbonate to obtain a sodium sulfite product.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of flue gas desulfurization, and in particular to a device and method for recovering and reusing sulfur dioxide in flue gas. Background technique [0002] Smoke is a mixture of gas and smoke, which is an important cause of air pollution. The composition of flue gas is very complex. The gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides. Among them, sulfur dioxide is the main cause of acid rain, which seriously harms buildings, soil and human beings. living environment. However, the content of sulfur dioxide in the flue gas is about 7%, and it is also the tail gas with the highest utilization value. If it is not treated and discharged directly into the atmosphere, it will cause serious air pollution; and the simple desulfurization without utilization or low utilization rate , will greatly increase the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/82C01D5/14
Inventor 李玮余东晓肖玲王金金姚腾宇
Owner 武钢资源集团乌龙泉矿业有限公司
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