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Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method

A desulfurization, denitrification, and absorption tower technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation to achieve the effects of unique structure, high mercury removal performance, and high desulfurization and denitrification rates.

Inactive Publication Date: 2012-07-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the separate treatment of sulfur dioxide and nitrogen oxides in the flue gas of industrial boilers and technical limitations, the present invention provides a new type of absorption tower and method that combines forward and countercurrent spraying combined with oxidation, desulfurization and denitrification of oxidants

Method used

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  • Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method
  • Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method
  • Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 , an absorption tower combined with ozone oxidation desulfurization and denitrification by spraying along and countercurrent. The inner chamber of the absorption tower 2 is provided with a desulfurization slurry pool 21, a desulfurization slurry nozzle 3, a slurry separator 4, a denitrification slurry nozzle 8 and a demister in sequence from bottom to top. 9. There is a flue gas inlet 1 and a flue gas outlet 10 on the tower body. The flue gas inlet 1 is located between the desulfurization slurry nozzle 3 and the desulfurization slurry pool 21. The flue gas outlet 10 is located above the demister 9. The absorption tower is surrounded by a slurry separator 4 Divided into two loops: the lower loop is the desulfurization loop (also known as the primary loop), which mainly completes the dissolution of lime and SO 2 The removal; the upper loop is the denitrification loop (also known as the secondary loop). The absorption slurry of the first and second loops ...

Embodiment 2

[0062] Such as figure 2 , this process is aimed at changing the oxidant, and other liquid-phase oxidants can be used, such as sodium hypochlorite. The liquid-phase oxidant is sprayed into the oxidant below the slurry separator 4 through the annular oxidant injection pipe 5, where the gas-liquid violently mixes, and the flue gas NO is oxidized to a high valence state, and the others are the same as in Example 1.

Embodiment 3

[0064] The present invention also has other changeable operation modes. For example, if only desulfurization is required, the addition of oxidant is stopped, and the secondary circuit is used as a desulfurization absorption section; if only denitrification is required, the primary circuit can be shut down, and only the secondary circuit can be guaranteed to operate.

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Abstract

The invention discloses an absorption tower for desulfurization and denitrification combined with an oxidant in forward-flow and back-flow spraying mode and a method. The absorption tower includes two washing sections: a first section is a desulfurization loop and arranged on the lower portion of the absorption tower, and sulfur dioxide and hydrogen chloride are removed through slurry forward-flow and back-flow and smoke contact cleaning; a second section cleans oxidized smoke pollutants in slurry back-flow and smoke contact mode mainly for removing oxynitride and heavy metal mercury. A slurry divider is arranged between the two cleaning sections, the bottom of the slurry divider is an oxidization area, and strong oxidant is sprayed in the area. For reducing consumption of the oxidant, a catalyst is added in second-loop slurry for achieving auxiliary oxidization. Sulfur dioxide, oxynitride, heavy metal mercury and the like can be removed simultaneously in a washing tower by the technology, and the absorption tower has the advantages of being high in efficient and simple and suitable for various combustion devices including fuel coal power stations, refuse incineration plants, organic and inorganic production enterprises and the like.

Description

Technical field: [0001] The invention relates to the field of air pollution control and aims to provide a new method for controlling multi-pollutants in flue gas of power station boilers and industrial boilers. technical background: [0002] It is well known that SO emissions from fossil fuel combustion processes 2 and NOx, forming acid rain and other secondary pollutants, which have seriously affected human production and life. Therefore, SO 2 The control and purification of NOx and NOx are imminent and crucial, and are related to the sustainable development of the national economy. The traditional flue gas desulfurization and denitrification process needs to be carried out in stages, which has disadvantages such as high investment, large floor area, and complex system. Therefore, it is of great significance to develop and research a flue gas multi-pollutant control process that is simple, reliable, economical and practical, and suitable for my country's national conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/76B01D53/60B01D53/64
CPCY02A50/20
Inventor 马双忱李卫东崔基伟莫熔伟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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