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Method for inhibiting secondary release of mercury in seawater desulfurization process

A secondary release and seawater technology, applied in separation methods, chemical instruments and methods, water aeration, etc., to achieve the effect of reducing secondary release and improving mercury removal efficiency

Inactive Publication Date: 2021-10-08
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are relatively few studies on the suppression of secondary release of mercury in seawater wet desulfurization devices. Therefore, it is of great practical significance to realize coordinated mercury removal in existing seawater wet flue gas desulfurization devices and to suppress the secondary release of mercury in desulfurization wastewater. Value and Theoretical Significance

Method used

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  • Method for inhibiting secondary release of mercury in seawater desulfurization process
  • Method for inhibiting secondary release of mercury in seawater desulfurization process
  • Method for inhibiting secondary release of mercury in seawater desulfurization process

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Embodiment

[0059] Taking a 300MW unit in a power plant as an example to elaborate, the unit layout figure 2 system shown. Under 300MW load, Hg in SCR inlet flue gas T The concentration is 55ug / m 3 , Hg 2+ The concentration is 33.8ug / m 3 , Hg 0 The concentration is 12.2ug / m 3 , Hg P The concentration is 9ug / m 3 ;SO 2 The concentration is 900 ppm, and the NOx concentration is 400 ppm.

[0060] Table 1: Adding conditions:

[0061]

[0062] Table 2: Mercury removal effect:

[0063]

[0064]

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PUM

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Abstract

The invention relates to a method for inhibiting secondary release of mercury in a seawater desulfurization process. The method comprises multiple or all of the following steps: adding NH4Cl and / or NH4Br solids into raw coal fed into a furnace; spraying an oxidizing agent into the SCR denitration device; spraying a solid adsorbent into the dust removal device; and spraying the oxidizing agent into the seawater wet desulphurization device, and adding a stabilizer and / or a curing agent into an aeration tank; and adjusting the pH value of the desulfurization wastewater in the aeration tank to 6-7. Mercury in the flue gas is promoted to be oxidized by adding a proper oxidant, and secondary release of mercury in the desulfurization wastewater is inhibited by adding a proper stabilizer / curing agent, so that the mercury removal efficiency of the system is improved, and the secondary release amount of Hg<0> is effectively reduced.

Description

technical field [0001] The invention relates to the fields of flue gas purification and pollutant control, in particular to a method for inhibiting the secondary release of mercury in the seawater desulfurization process. Background technique [0002] Mercury in coal-fired flue gas mainly exists in three forms: elemental mercury (Hg 0 ), ionic mercury (Hg 2+ ) and particulate mercury (Hg p ). At present, mercury removal methods in coal power plants mainly focus on two aspects: sorbent injection technology and collaborative mercury removal technology using existing pollutant control equipment. Although the sorbent injection technology has high mercury removal efficiency, its cost is high, the subsequent treatment of the sorbent is difficult, and improper treatment may easily cause secondary pollution. Using existing pollutant control equipment to coordinate mercury removal technology has relatively great advantages, and it is currently the main mercury removal technology ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/50B01D53/86B01D53/56B01D53/90C10L9/10B01D53/83B01D53/64C02F9/04C02F101/20C02F103/18
CPCB01D53/75B01D53/78B01D53/50B01D53/8631B01D53/90C10L9/10B01D53/83B01D53/64C02F9/00B01D2258/0283B01D53/10C02F7/00C02F1/66C02F1/5263C02F1/5236C02F2101/20C02F2103/18
Inventor 王乐乐黄见勋苏胜王中辉雷嗣远向军陈逸峰尹子俊马云龙鲍强姚燕何川孔凡海杨晓宁卿梦磊
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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