Method and device for removing sulfur, nitre and mercury in smoke

A technology of desulfurization, denitrification, mercury removal, and gas mixing device, which is applied in the field of flue gas purification, can solve the problems of insolubility and stability that are difficult to remove, and achieve the effects of convenient transformation, obvious mercury removal effect, and reduction of equipment

Inactive Publication Date: 2014-08-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While elemental mercury (Hg 0 ) is difficult to remove due to its strong insolubility and stability

Method used

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  • Method and device for removing sulfur, nitre and mercury in smoke
  • Method and device for removing sulfur, nitre and mercury in smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 , a device for flue gas desulfurization, denitrification and mercury removal, comprising a flue gas inlet pipe, the flue gas inlet pipe communicates with a gas mixing device 2 through a dust collector 4 and a fan 5, and the gas mixing device 2 is connected with a chlorine dioxide gas preparation device 1, The gas outlet of the gas mixing device 2 is connected to the wet desulfurization device 3 , and the wet desulfurization device 3 is connected to the chimney 6 .

[0022] During the implementation of the process of this embodiment, the chlorine dioxide gas prepared by the chlorine dioxide gas preparation device 1 is sprayed into the gas mixing device 2 at the front of the wet desulfurization device 3, where the smoke after dust removal by the dust collector 4 is realized. NO and elemental mercury (Hg 0 ) pre-oxidation, the NO in the flue gas is oxidized to high-valence nitrogen oxides, and the elemental mercury (Hg 0 ) is oxidized to oxidized mercury...

Embodiment 2

[0024] Such as figure 2 , a device for flue gas desulfurization, denitrification and demercuration, comprising a flue gas inlet pipe, a flue gas inlet pipe and a chlorine dioxide gas preparation device 1 are all connected to a gas mixing device 2, and the gas outlet of the gas mixing device 2 is connected to a semi-dry desulfurization device 7. The semi-dry desulfurization device 7 is connected to the chimney 6 through the dust collector 4 and the fan 5 .

[0025] In the process of implementing the present embodiment, the chlorine dioxide gas prepared by the chlorine dioxide gas preparation device 1 is sprayed into the gas mixing device 2 at the front of the semi-dry desulfurization device 7, where the pre-oxidation of the flue gas is realized. Oxidize NO in the flue gas to high-valence nitrogen oxides, and convert elemental mercury (Hg 0 ) is oxidized to oxidized mercury (Hg 2+ ), with HgCl 2 The form exists in the flue gas, the pre-oxidized flue gas then enters the semi-...

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Abstract

The invention relates to a method and a device for removing sulfur, nitre and mercury in smoke. The method comprises the following steps: introducing dedusted smoke into a mixing device, injecting chlorine dioxide gas to carry out gas phase oxidation on the smoke, then introducing the smoke into a wet type sulfur removing device, removing high-valence nitric oxide, sulfur dioxide and HgC12 by taking a calcium-based sulfur removing size as an absorbent, and discharging the clean smoke into the atmosphere; or directly injecting the smoke into the chlorine dioxide gas to carry out gas phase oxidation, then introducing the smoke into a semidry type sulfur removing device, removing high-valence nitric oxide, sulfur dioxide and HgC12 by taking a calcium-based absorbent and humidified fly ash in the smoke as absorbing and removing agents, and discharging the clean smoke into the atmosphere. The method is based on an existing wet type sulfur removing device or semidry type sulfur removing device, thus facilitating the improvement. According to the method and device disclosed by the invention, dust and sulfur do not need to be removed in advance, so that used equipment are reduced, and the complexity of a system is reduced. In addition, an obvious mercury removal effect is also achieved, thereby really embodying the significance of combined removal.

Description

technical field [0001] The invention relates to a method and a device for jointly removing multiple pollutants in flue gas, belonging to the technical field of flue gas purification. Background technique [0002] In recent years, the harm of air pollution to human health and the threat to the ecological environment have become more and more obvious. my country is paying more and more attention to the control and emission reduction of SOx, NOx and trace toxic metal elements in flue gas, especially mercury. The emission standards are becoming stricter, and efficient and economical flue gas purification processes have become the general trend. However, the flue gas pollutant removal equipment in the prior art is complicated and the operating cost is high. How to develop low-cost and high-efficiency combined desulfurization, denitrification and demercuration according to the installation of existing desulfurization equipment, especially for those small and medium-sized industria...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/60B01D53/64
CPCY02A50/20
Inventor 董勇李广培崔琳王鹏张立强徐夕仁
Owner SHANDONG UNIV
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