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A method for simultaneous desulfurization and denitrification of aeration flue gas

An aeration type, flue gas technology, applied in the field of flue gas desulfurization and denitrification, can solve the problems of high cost of flue gas denitrification, and achieve the effects of easy automatic control, energy saving and cost reduction

Active Publication Date: 2020-06-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of high cost of flue gas denitrification in the existing catalytic oxidation absorption method, and to provide a method for simultaneous desulfurization and denitrification of flue gas with aeration

Method used

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  • A method for simultaneous desulfurization and denitrification of aeration flue gas

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specific Embodiment approach 1

[0009] Specific implementation mode 1: This implementation mode is a method for simultaneous desulfurization and denitrification of aeration flue gas, which is specifically completed according to the following steps:

[0010] The electrolysis device is used as the absorption tower, and the mass fraction of 0.1% to 20% persulfate aqueous solution is used as the electrolyte. The aeration head is installed at the bottom of the electrolysis device, and the voltage applied to the anode of the electrolysis device is 1.8V to 1000V. At 100°C, the flue gas is injected into the electrolysis device through the aeration head, and the aeration speed is 0.1m 3 min -1 m -2 ~100m 3 min -1 m -2 , after desulfurization and denitrification, the flue gas is discharged from the upper part of the electrolysis device, and the electrolyte solution absorbing sulfur and nitrogen is sent to the centrifuge device, and then the precipitant is added to the centrifuge device, centrifuged, the precipitat...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the precipitation agent is a salt containing metal cations, wherein the metal cations are calcium ions, potassium ions or a mixture of calcium ions and potassium ions. Others are the same as the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the molar ratio of the S element in the electrolyte absorbing sulfur and nitrogen to the metal cation in the precipitant is 1:(0.3~5) . Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for synchronously desulfurizing and denitrifying smoke by aerating, relates to a method for desulfurizing and denitrifying smoke, and aims at solving the problem of high cost of smoke denitrifying of a conventional catalytic oxidizing absorbing method. The method is characterized in that an electrolyzing device is treated as an absorbing tower; smoke is charged intothe electrolyzing device through an aerating head; the smoke subjected to desulfurizing and denitrifying is exhausted through the electrolyzing device; an electrolyzing liquid absorbing sulfur and nitrogen is transferred into a centrifuging device; a precipitating agent is added to the centrifuging device; the precipitate obtained by centrifugal separating is recovered; the supernate obtained incentrifugal separating is partially used as the electrolyzing liquid of the electrolyzing device, and the other part is used for recovering dilute nitric acid. The method has the advantages that high-price nitric oxide oxidation catalyst is not used, so that the smoke denitrifying cost is reduced; the wastes are treated through wastes; nitric oxide is oxidized under low temperature, and the nitricoxide conversion rate is more than 70%. The method is mainly used for synchronously desulfurizing and denitrifying smoke.

Description

technical field [0001] The invention relates to a method for flue gas desulfurization and denitrification. Background technique [0002] Catalytic oxidation absorption method is a commonly used technology for flue gas denitrification. Nitric oxide in the flue gas reacts with oxygen under the action of a catalyst to form nitrogen dioxide under high temperature conditions. The treated flue gas is absorbed by water to form nitric acid and nitrous acid. Since the sulfur components contained in the flue gas are toxic to the catalyst, the oxidation efficiency of nitric oxide will decrease rapidly. At the same time, most of the catalysts used are synthesized by precious metals, which increases the cost of flue gas denitrification. Contents of the invention [0003] The purpose of the present invention is to solve the problem of high cost of flue gas denitrification in the existing catalytic oxidation absorption method, and provide an aeration-type flue gas simultaneous desulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/60
CPCB01D53/60B01D2257/404B01D2258/0283B01D2259/80
Inventor 马军宋浩然闫林霞
Owner HARBIN INST OF TECH