Method and device for treating sulfur-containing flue gas

A treatment method and flue gas technology, applied in separation methods, sulfur preparation/purification, chemical instruments and methods, etc., can solve the problems of long treatment process, high energy consumption and complicated treatment process, and achieve low treatment cost, High carbon fixation efficiency and good removal effect

Active Publication Date: 2019-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still shortcomings such as long processing flow, complicated processing process, and high energy consumption.

Method used

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  • Method and device for treating sulfur-containing flue gas
  • Method and device for treating sulfur-containing flue gas
  • Method and device for treating sulfur-containing flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The waste lye produced by an ethylene plant in an enterprise has a COD of 58000 mg / L and a sodium sulfide concentration of 2.9wt% (S 2- : 12200mg / L), the concentration of sodium carbonate is 2.0wt% (20500mg / L), and the concentration of sodium hydroxide is 1.6wt%.

[0051] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 14v%, NOx content of 0.06v% (of which NO accounts for 90%), SO 2 The content is 0.04v%.

[0052] Pass the flue gas into the desulfurization absorption tower, use ethylene waste lye as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5-6, when the pH is lower than 5, discharge part of the desulfurization absorption liquid, Start to supplement the waste lye, when the pH reaches 6, stop the supplement to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to reg...

Embodiment 2

[0057] The waste lye produced by an ethylene plant in an enterprise has a COD of 33000mg / L and a sodium sulfide concentration of 2.1wt% (S 2- : 8831mg / l), the concentration of sodium carbonate is 1.1wt% (11275mg / L), and the concentration of sodium hydroxide is 1.2wt%.

[0058] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 10v%, NOx content of 0.04v%, SO 2 The content is 0.03v%.

[0059] Pass the flue gas into the desulfurization absorption tower, use ethylene waste caustic liquor as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5.5-6.5, when the pH is lower than 5.5, discharge part of the desulfurization absorption liquid, Start to supplement ethylene spent lye, when the pH reaches 6.5, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to regenerate th...

Embodiment 3

[0064] The waste lye produced by propane dehydrogenation to olefins in an enterprise contains 6.83wt% sodium sulfide, 4.85wt% sodium hydrosulfide, 117300mg / L COD, and 13.5 pH.

[0065] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 20v%, NOx content of 0.05v%, SO 2 The content is 0.02v%.

[0066] Pass the flue gas into the desulfurization absorption tower, use propylene waste lye as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5-6, when the pH is lower than 5, discharge part of the desulfurization absorption liquid, Start supplementing propylene spent lye, when the pH reaches 6, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to regenerate the desulfurization waste liquid to obtain CaSO 3 The precipitate is calcined at high temperature to obtain high...

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Abstract

The invention relates to a method and device for treating a sulfur-containing flue gas. The method comprises the following steps: introducing flue gas into a desulfurizing reactor to obtain a desulfurized flue gas and a desulfurized waste liquid by adopting an olefin waste alkali liquor as an absorbent; causticizing and regenerating the desulfurized waste liquid to obtain precipitate, calcining ata high temperature to obtain high concentration SO2, and reacting with the desulfurized flue gas to prepare sulfur; introducing the generated gas into a photobioreactor for microalgae cultivation, and collecting an effluent gas; separating solid and liquid from the cultured system to respectively obtain microalgae cells and filtrate; adding sodium peroxide into the filtrate, and introducing the effluent gas into the filtrate to react to obtain a purified gas; oxidizing, and denitrifying the filtrate. The method can be used for efficiently treating a flue gas by treating a flue gas containingSO2, CO2 and NOX with olefin waste alkali liquid treatment and microalgae cultivation coupling treatment, has the advantages of good removing effect, low treatment cost and the like, and economical and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a treatment method and a treatment device for sulfur-containing flue gas. Background technique [0002] Nitrogen oxides (NOx) have N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other forms, and can cause a variety of hazards, such as photochemical smog can be produced with volatile organic compounds (VOC) in the atmosphere, which can cause strong irritation to the eyes and throat, and cause headaches and respiratory diseases. cause death. my country's NOx emissions have exceeded 20 million tons for many years in a row. Although it has shown a continuous downward trend since 2012, its pollution situation is still severe. Since 2003, my country's SO 2 The total emissions have also remained high. In 2014, my country's SO 2 The total emission is 19.744 million tons. On September 12, 2014, three ministries and commissions including the National...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/84B01D53/62B01D53/56B01D53/52B01D53/75C01B17/04
CPCY02A50/20
Inventor 赵磊师文静刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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