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Method and device for collaborative removal of mercury in flue gas

A collaborative removal device and wet flue gas desulfurization technology, which is applied in the fields of desulfurization flue gas collaborative demercury removal, dust collector, and denitrification, can solve the problems of unsatisfactory mercury concentration, difficult follow-up treatment, and failure to use mercury removal functions, etc. problem, to achieve the effect of meeting mercury emission standards

Inactive Publication Date: 2013-03-27
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it does not use the partial mercury removal function of the existing supporting SCR denitrification device, the oxidant Cl2 is a toxic substance, special measures need to be taken for transportation and storage, and the subsequent treatment of the system Difficulty, high investment and operating costs
The defect of this method: the cost of strong oxidizing agent is high, and it brings new environmental pollution problems to the subsequent treatment
[0007]Patent Document: Publication No. CN 101543712A, Chinese Invention Patent Application Publication Introduces a Multi-stage Humidification Synergistic Removal of SO2 in a Circulating Fluidized Bed , NOx, and mercury. This method has a complex system, and the mercury removal efficiency is low. The mercury concentration in the flue gas cannot meet the current environmental protection regulations.

Method used

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  • Method and device for collaborative removal of mercury in flue gas
  • Method and device for collaborative removal of mercury in flue gas
  • Method and device for collaborative removal of mercury in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] like figure 1 , 2 As shown, the mercury removal oxidant uses 0-43% Wt. ammonium chloride solution.

[0045] The flue gas 11 generated by the combustion of the boiler 1 flows through the upstream flue 40 of the SCR denitrification device, mixes with the mercury removal oxidant HCl gas sprayed by the AIG injection pipe 46 of the SCR denitrification device, and after being uniformly mixed by the flue gas mixer 47, enters the SCR denitrification device Reactor 49, under the action of SCR catalyst 48, the gaseous elemental mercury Hg in the flue gas 0 Oxidized to gaseous divalent mercury oxide Hg 2+ (HgCl 2 ); the flue gas passes through the air preheater 5 for heat exchange and then enters the dust collector 6 downstream, and the particulate mercury Hg (p) in the flue gas is collected and removed by the dust collector 6; Entering the wet flue gas desulfurization (WFGD) device 8, the gaseous divalent mercury oxide Hg in the flue gas 2+ Absorbed by the spray liquid of t...

Embodiment 2

[0053] as attached image 3 Shown: 0-37% Wt. hydrochloric acid solution is used as the mercury removal oxidant.

[0054] This embodiment is basically the same as the embodiment, and the difference is that in addition to ammonium chloride solution, an oxidant similar to ammonium chloride that can be decomposed by heat to generate HCl can also be used as the mercury removal oxidant, and it is also easy to think of directly using hydrochloric acid solution. The hydrochloric acid solution is used as the mercury removal oxidant, and the only control strategy is different from the ammonium chloride oxidant. SCR denitrification control and mercury removal control are two separate closed-loop circuits, and the opening degree signal of the flow regulating valve 22 of the hydrochloric acid solution of the mercury removal oxidant does not need to be fed back to the flow regulating valve 42 of the SCR denitrification reducing agent to adjust the flow rate 43 of the denitration reducing ag...

Embodiment 3

[0057] On the basis of Examples 1 and 2, the mercury emission concentration and denitrification efficiency can be controlled by simultaneously adjusting the concentration and / or amount of the mercury removal oxidant solution.

[0058]

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Abstract

The invention discloses a method and device for the collaborative removal of mercury in flue gas, and belongs to the purification field of the flue gas in atmospheric pollutants of power plant boilers. The method comprises the following steps that: after primary hot air or secondary hot air of a temperature boiler is introduced to mix with a mercury removal oxidant and an SCR (selective catalytic reduction) denitration reductant, and then the flue gas is injected to mix again, an obtained mixture enters an SCR denitration device to denitrate along a flow path of the flue gas, and simultaneously, elemental mercury Hg0 is oxidated into gaseous bivalent mercury oxide Hg<2+>; then, the gaseous bivalent mercury oxide Hg<2+> enters a dust remover to carry out dust removal, and simultaneously, granular mercury Hg is removed; and then, the obtained product is subjected to desulfurization in a wet flue gas desulfurization device, and simultaneously, the bivalent mercury oxide Hg<2+> is removed. The device comprises an SCR denitration system, and a device for mixing hot air, a mercury removal oxidant and the SCR denitration reductant. The method and the device for the collaborative removal of the mercury in the flue gas, disclosed by the invention, fully use the collaborative function of the existing SCR denitration system, the dust remover and the WFGD (wet flue gas desulfurization device), and are few in system changes and good in mercury removal effect.

Description

technical field [0001] The invention belongs to the field of flue gas purification of air pollutants of power plant boilers, and in particular relates to a method and a device for synergistic demercuration of flue gas from denitrification, dust collector and desulfurization. Background technique [0002] Mercury is a trace element in coal, which is converted into gaseous elemental mercury Hg after combustion 0 (g), gaseous divalent mercury Hg 2+ , and particulate mercury Hg (p) exist in flue gas in three forms, among which divalent mercury Hg in gaseous mercury 2 + Accounted for 30-95%, elemental mercury accounted for 5-70%. [0003] GB13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants" stipulates that from January 1, 2015, all power generation boilers will implement the emission concentration limit of mercury and its compounds less than 0.03mg / Nm3. At present, most of the coal-fired flue gas has been equipped with selective catalytic reduction (SCR...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/64B01D53/60B01D53/30
Inventor 杨志忠
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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