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Photoelectric synergistic catalytic oxidation and wet absorption mercury nitrate integrated removal system and method

A technology of synergistic catalysis and photoelectricity, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of unacceptable construction site or investment and high construction cost

Pending Publication Date: 2021-11-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for a set of wet mercury removal equipment, it is difficult to accept both the construction site and the investment for the new power plant and the operating power plant.
[0003] At present, the construction cost of independent forced oxidation mercury removal equipment is very high. Therefore, it is necessary to propose a wet mercury removal method with high efficiency and economical requirements, and can use the existing equipment of the power plant to simultaneously remove mercury and other pollutants. Combined removal to meet increasingly stringent emission standards for pollutants in flue gas from coal-fired power plants

Method used

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  • Photoelectric synergistic catalytic oxidation and wet absorption mercury nitrate integrated removal system and method
  • Photoelectric synergistic catalytic oxidation and wet absorption mercury nitrate integrated removal system and method
  • Photoelectric synergistic catalytic oxidation and wet absorption mercury nitrate integrated removal system and method

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Embodiment Construction

[0037] Such as figure 1 As shown, a photoelectric synergistic catalytic oxidation and wet absorption mercury and nitric acid integrated removal system consists of a flue gas pipeline 1, a solution nozzle 2, an electrode plate 3, an ultraviolet light source 4, positive and negative electrodes 5, and an electrochemical enrichment pool 6. It is composed of check valve 7, circulating pump 8 and spraying device 9;

[0038] The flue gas pipeline 1 is the main body and attachment of the whole system. It is an inlet straight pipe section connected to a middle vertical pipe section. Connect the outlet straight pipe section, shaped like figure 1 As shown; the solution nozzle 2 is installed on the upper wall of the inlet straight pipe section of the flue gas pipeline 1; the electrode plate 3 is installed on the upper and lower walls of the inlet straight pipe section of the flue gas pipeline 1, and the position of the electrode plate 3 is behind the solution nozzle 2; The ultraviolet l...

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Abstract

The invention discloses a photoelectric synergistic catalytic oxidation and wet absorption mercury nitrate integrated removal system and method. The system can simultaneously remove elemental mercury and nitrogen oxide in coal-fired flue gas, and two devices are used for respectively carrying out photoelectric synergistic catalytic oxidation elemental mercury and wet absorption and removal of mercury and nitrogen elements. Atomizing nozzles are arranged in a flue gas pipeline, a hydrogen peroxide solution containing ferrous sulfate hexahydrate is sprayed, elemental mercury is efficiently converted into water-soluble divalent mercury under the action of an electrode plate electric field and an ultraviolet lamp, then the flue gas enters a subsequent wet-process denitrification device. The mercury and nitrogen elements in the flue gas can be absorbed and removed at the same time. The system can be modified on the basis of the existing wet denitrification process, is simple in process flow, low in investment cost and high in removal efficiency, and has relatively high economic value and practical production significance.

Description

technical field [0001] The invention relates to a method for efficiently removing mercury and nitrogen in coal-fired flue gas, in particular to a system and method for integrated removal of mercury and nitric acid through photoelectric synergistic catalytic oxidation and wet absorption. Background technique [0002] Mercury is a heavy metal element. No matter it is mercury element or its compounds, it has strong biological toxicity, causing various direct or indirect harms to humans, plants and animals. The international environmental and health communities have paid increasing attention to the hazards of mercury. The sources of mercury pollution to the environment mainly include two aspects: natural release and man-made emissions, among which, the proportion of mercury emissions from coal combustion accounts for about one-third. In the process of wet desulfurization, adjust various operating parameters, and use H 2 S and adding a small amount of ethylenediaminetetraacetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/64B01D53/86B01D53/56B01D53/75
CPCB01D53/78B01D53/64B01D53/8625B01D53/75B01D2258/0283B01D2259/804B01D2251/106
Inventor 李娜周屈兰檀经考
Owner XI AN JIAOTONG UNIV
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