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Comprehensive treatment method and device for flue gas

A comprehensive treatment, flue gas technology, applied in the direction of separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problems of long treatment process, high energy consumption and complicated treatment process, and achieve low treatment cost, solid High carbon 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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  • Comprehensive treatment method and device for flue gas
  • Comprehensive treatment method and device for flue gas
  • Comprehensive treatment method and device for flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In the soda residue of oil refining in a certain enterprise, the COD is about 2.83×10 5 mg / L, the sulfide is 1.68×10 4 mg / L, volatile phenol 7.19×10 4 mg / L, the free base is about 2%-3%.

[0053] The flue gas emitted by an enterprise mainly consists of: CO2 content of 14v%, NOx content of 0.06v% (of which NO accounts for 90%), SO 2 The content is 0.04v%.

[0054] Pass the flue gas into the desulfurization absorption tower, use refining alkali slag as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 4.5-5.5, when the pH is lower than 4.5, discharge part of the desulfurization absorption liquid, and start Supplement the refining alkali residue, when the pH reaches 5.5, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid is discharged to stand still to recover the oil phase, and the desulfurization waste liquid mainly composed of sodium bisulfite is obtained, and slaked...

Embodiment 2

[0059] In the soda residue of oil refining in a certain enterprise, the COD is about 3.53×10 5 mg / L, sulfide is 2.0×10 4 mg / L, volatile phenol 5.33×10 4 mg / L, the free base is about 2%-3%.

[0060] The flue gas emitted by an enterprise mainly consists of: CO 2 content of 10v%, NOx content of 0.04v% (of which NO accounts for 90%), SO 2 The content is 0.035v%.

[0061] Pass the flue gas into the desulfurization absorption tower, use refining alkali slag 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, and start Supplement the refining alkali residue, when the pH reaches 6, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid is discharged to stand still to recover the oil phase, and the desulfurization waste liquid mainly composed of sodium bisulfite is obtained, and slaked lime is a...

Embodiment 3

[0066] In the soda slag of an oil refining enterprise, the COD is about 2.33×10 5 mg / L, the sulfide is 1.28×10 4 mg / L, volatile phenol 4.65×10 4 mg / L, the free base is about 2%-3%.

[0067] The flue gas emitted by an enterprise mainly consists of: CO 2 content of 20v%, NOx content of 0.05v% (of which NO accounts for 90%), SO 2 The content is 0.02v%.

[0068] Pass the flue gas into the desulfurization absorption tower, use refining alkali slag 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, and start Supplement the refining alkali residue, when the pH reaches 6, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid is discharged to stand still to recover the oil phase, and the desulfurization waste liquid mainly composed of sodium bisulfite is obtained, and slaked lime is added to c...

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Abstract

The invention relates to a comprehensive treatment method and device for flue gas. The method comprises the following steps: introducing flue gas into a desulfurization reactor, and treating the fluegas by virtue of oil refining alkali residue as an absorbent, so as to obtain desulfurized flue gas and desulfurized waste liquid; carrying out causticization regeneration on the desulfurized waste liquid so as to obtain precipitates, carrying out high-temperature calcination, and reacting by virtue of obtained high-concentration SO2 and the desulfurized flue gas so as to prepare sulfur; removingorganic sulfide and VOCs from produced gas, introducing the produced gas into photobioreactor for microalga culture, and collecting discharged gas; carrying out solid-liquid separation on a culture system, so as to respectively collect microalga cells and filtrate; adding sodium peroxide into the filtrate, introducing the discharged gas into the filtrate for reaction, so as to obtain purified gas;and carrying out denitrification on the filtrate after oxidation. According to the comprehensive treatment method, flue gas containing SO2, CO2 and NOX is treated through the coupling of nitric aciddesulfurization and microalga culture, so that the efficient treatment of the flue gas is realized; and the comprehensive treatment method and device for flue gas have the advantages of good removal effect, low treatment cost, economy, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a comprehensive flue gas treatment method and device. 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 Development and Ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/50B01D53/78B01D53/84B01D53/56B01D53/62
CPCY02C20/10Y02A50/20
Inventor 赵磊师文静刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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