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Method and device for simultaneous desulphurization and denitration by flue gas-seawater method

A desulfurization, denitrification, seawater technology, applied in separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problems of secondary pollution, high construction and operation costs, complex processes, etc.

Inactive Publication Date: 2015-04-08
彭斯干
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The common problems existing in the existing simultaneous desulfurization and denitrification technical solutions are: in order to simultaneously desulfurize and denitrify, expensive catalysts or / and absorbents need to be added in the process; absorbents and catalysts, especially chemical raw materials including valuable catalysts, etc. The use of resources and energy causes excessive resource and energy consumption, resulting in complex processes, low overall reliability of process devices, high construction and operation costs, and some secondary pollution problems, so it is difficult to popularize and apply

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  • Method and device for simultaneous desulphurization and denitration by flue gas-seawater method

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Embodiment 1

[0050] Such as figure 1 Shown is a schematic diagram of the steps of the simultaneous desulfurization and denitrification method of flue gas and seawater method of the present invention, figure 2 It is the process program of the present invention applied in thermal power plants; the steps of the method for simultaneous desulfurization and denitrification of flue gas by seawater method in this embodiment are: A) seawater catalytic cleaning flue gas: use seawater to contain SO 2 and NOx flue gas for catalytic scrubbing to remove SO in the flue gas 2 and NOx, and then discharge the purified flue gas through simultaneous desulfurization and denitrification and discharge the acidic seawater formed in the washing process; the catalytic washing of the present invention is iron catalytic washing with seawater having or adding a certain amount of iron ions, or / and Make seawater or / and flue gas go through magnetic catalytic washing with an additional magnetic field. As far as this emb...

Embodiment 2

[0063] What is different from the above-mentioned embodiment 1 is that the iron catalytic washing carried out with seawater is to add iron ions through a device that can add iron-containing solution during washing; the main parameters of this embodiment are:

[0064] Flue gas volume 1,100,000Nm 3 / h

[0065] Raw flue gas SO 2 Concentration 1900mg / Nm 3 , NOx concentration 650mg / Nm 3

[0066] Alkaline-acid ratio of washed seawater flue gas 1

[0067] The concentration of iron ion after washing seawater is 106 μg / kg

[0068] Clean flue gas SO 2 76mg / Nm 3 , NOx 380mg / Nm 3

[0069] Sea water quality recovery device drainage pH >6.8

[0070] Drainage COD increment <0.5mg / l

Embodiment 3

[0072] The difference from the above-mentioned embodiments is that the iron catalytic washing is a method in which a metal with lower electrochemical activity than iron is used as a cathode to make part of the iron material in the washing environment become a sacrificial anode to release iron ions; this implementation For example, the main parameters are: flue gas volume 2,100,000Nm 3 / h

[0073] Raw flue gas SO 2 1680mg / Nm 3 , NOx 580mg / Nm 3

[0074] The alkali-acid ratio of the washed seawater flue gas is 200

[0075] Washing seawater iron ion concentration 300μg / kg

[0076] Clean flue gas SO 2 80mg / Nm 3 , NOx 180mg / Nm 3

[0077] Sea water quality recovery device drainage pH >6.8

[0078] Drainage COD increment <4.3mg / l

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Abstract

The invention relates to a method and a device for simultaneous desulphurization and denitration by a flue gas-seawater method. The method comprises the following steps: A) catalyzing and washing the flue gas containing SO2 and NOx by seawater to remove the SO2 and the NOx in the flue gas, and then discharging the purified flue gas subjected to the desulphurization and the denitration and discharging acid seawater formed during washing; and B) recovering the quality of the seawater, namely adding the seawater into the acid seawater and blowing the air into the acid seawater, and discharging the seawater when the quality of the acid seawater is recovered to accord with the environment-friendly requirement. The method and the device for simultaneous desulphurization and denitration have the advantages that chemical raw materials are not needed, the emission reduction efficiency and reliability are high, the occupied area is small, the construction and running costs are low, and the method and the device are particularly suitable for simultaneous desulphurization and denitration for boiler flue gases of large and medium-sized heat power plants.

Description

technical field [0001] The invention relates to a method and device for simultaneous desulfurization and denitrification of flue gas by seawater method, which uses seawater to simultaneously remove sulfur and nitrate in flue gas, and is especially suitable for boilers such as thermal power plants to reduce the emission of pollutants such as sulfur dioxide and nitrogen oxides. The invention belongs to the technical field of atmospheric environmental protection, and more specifically belongs to the technical field of simultaneous desulfurization and denitrification of flue gas (simultaneous desulfurization and denitrification), (simultaneous removing SOx and NOx). Background technique [0002] Due to the need to protect the atmospheric environment, industrial flue gas must reduce the emission of two important pollutants, sulfur dioxide and nitrogen oxides. However, due to the complex process structure, large resource consumption, and problems such as low reliability and high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/86B01D53/60
CPCY02C20/10Y02A50/20
Inventor 彭斯干
Owner 彭斯干
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