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Oxidation method of flue gas desulphurization waste liquid

A technology for desulfurization waste liquid and flue gas, which is applied in the direction of oxidized water/sewage treatment, gaseous effluent wastewater treatment, etc. It can solve the problems of economic decline and increase in operating costs, so as to improve the effect of gas-liquid contact and reduce the scale of equipment , save land occupation and investment effect

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Oxidizing the COD in the desulfurization waste liquid to the maximum can reduce equipment investment, but generally speaking, when the oxidation rate reaches a certain limit, the operating cost required to further increase the oxidation rate will increase greatly, so the overall economy will decline; Comprehensive discharge requirements, how to determine the desulfurization liquid oxidation reduction COD treatment method and control conditions, to ensure the discharge standard under the premise of achieving the maximum economy, is the desulfurization liquid oxidation reduction COD treatment method needs to focus on research

Method used

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  • Oxidation method of flue gas desulphurization waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Small lab experiments.

[0026] The oxidation tower includes a catalyst bed oxidation zone, the height of the catalyst bed in the oxidation zone is 200 mm, the height of the spray section is 100 mm, and the operating temperature is normal temperature. The oxidation catalyst is commercially available carbonate-type manganese ore powder with a diameter of 2-3mm, and the mass content of Mn is 28%.

[0027] Use compressed air to oxidize sodium sulfite (mass concentration 10%) aqueous solution to simulate desulfurization waste liquid, and conduct desulfurization liquid oxidation test. The gas phase inlet pressure is 0.1MPa (gauge pressure), and the oxidation tower outlet is normal pressure. The reaction results under different conditions are listed in Table 1.

[0028]The influence of table 1 liquid-gas ratio on COD removal rate (residence time 20min)

[0029] Liquid to gas ratio, L / m 3

Tower import COD, mg / L

Tower outlet COD, mg / L

COD disposal rate, ...

Embodiment 2

[0033] The waste liquid of flue gas sodium desulfurization in an enterprise has a liquid temperature of 53°C and a COD content of 11083mg / L. A three-stage catalytic oxidation tower is adopted, including three catalytic oxidation zones, a liquid distributor and two liquid redistributors. The height of the catalyst bed in the oxidation zone is 350 mm, and the oxide-type manganese ore (manganese mass content is 35%) particles with a particle size of 1 cm is used, and the height of the spraying section is 250 mm. Through air oxidation, the liquid-gas ratio is 20L / m 3 , the liquid residence time is 60min, the operating temperature is 50-60°C, and the oxidized desulfurization liquid is led to the water inlet of the sewage treatment plant.

[0034] After oxidation treatment, the COD content of the desulfurization liquid is reduced to 95mg / L, and the COD removal rate reaches about 99% (mass), the outlet gas of the oxidation tower is at normal pressure, and the oxidation air flow rate...

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Abstract

The invention relates to an oxidation method of flue gas desulphurization waste liquid. The method comprises steps that: Mn ore is adopted as a catalyst; a countercurrent catalytic oxidation tower is adopted; the Mn ore is arranged in the catalytic oxidation tower with a fixed bed manner; desulphurization waste liquid enters from the upper part of the catalytic oxidation tower; the desulphurization waste liquid contacts air with a countercurrent manner on the fixed bed Mn ore catalyst bed layer, such that an oxidation COD-removing reaction is carried out; and a desulphurization waste liquid obtained after oxidation is discharged from the catalytic oxidation tower. The method provided by the invention is advantaged in simple process and high efficiency. The method is economic and reasonable. With the method, obstruction can hardly occur. The method satisfies environment protection standards. The method is suitable to be used in a processing process for reducing the COD of flue gas desulphurization waste liquid.

Description

technical field [0001] The invention relates to an oxidation method for waste liquid of flue gas desulfurization by wet method, in particular to a treatment method for oxidative removal of COD from waste liquid of flue gas desulfurization by sodium alkali method. Background technique [0002] The COD content of flue gas desulfurization waste liquid is one of the important quality indicators, such as limestone-gypsum desulfurization, sodium-alkali desulfurization, magnesium oxide desulfurization, ammonia desulfurization, etc. Many wet desulfurization processes produce desulfurization waste liquid containing a certain amount of COD, so appropriate methods are required for removal. [0003] The COD reduction methods of flue gas desulfurization waste liquid are mainly divided into two types: natural oxidation and forced oxidation. Natural oxidation is to make the air naturally enter the desulfurization liquid through mechanical stirring in the oxidation device, and use the O in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/18
Inventor 戴文军刘忠生方向晨齐慧敏彭德强
Owner CHINA PETROLEUM & CHEM CORP
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