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Flue gas conditioning agent for flue gas mercury removal and composite flue gas purifying method thereof

A technology for flue gas purification and conditioning agent, applied in the field of flue gas purification, can solve the problems of high carbon content of fly ash, unsatisfactory mercury removal effect, influence on cement foaming rate, etc. Reuse value and avoid the effect of excessive carbon content

Active Publication Date: 2013-07-31
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a flue gas conditioner for flue gas mercury removal and its composite flue gas purification method, to solve the unsatisfactory mercury removal effect of the existing flue gas mercury removal technology, the high cost of using activated carbon-based adsorbents, and the The technical problem that the carbon content of fly ash is too high, which affects the foaming rate of cement

Method used

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  • Flue gas conditioning agent for flue gas mercury removal and composite flue gas purifying method thereof
  • Flue gas conditioning agent for flue gas mercury removal and composite flue gas purifying method thereof
  • Flue gas conditioning agent for flue gas mercury removal and composite flue gas purifying method thereof

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Embodiment 1

[0040] Embodiment one sees figure 1 As shown, in the flue gas system of a coal-fired power plant installed with SCR denitrification reactor 3, the fuel coal enters the burner 1 for combustion, releasing various flue gases including mercury (such as SO 2 , NO X , CO 2 etc.) and coal ash. After the high-temperature flue gas passes through various levels of steam heat exchangers and air preheaters, the flue gas is cooled below 450°C and then enters the SCR denitrification, dust collector 4 (electrostatic, cloth bag, or electric bag) for ash removal and wet desulfurization, purification The flue gas is finally exhausted into the atmosphere. In this embodiment, the flue gas conditioner is put into the flue at the entrance of the SCR denitrification reactor 3, and the conditioner can enter the flue through a separate delivery pipe, or enter the flue together with the ammonia used for denitrification. The smoke conditioner used can be liquid or solid. After the conditioning agen...

Embodiment 2

[0041] Embodiment two see figure 2 As shown, in the coal-fired power plant flue gas system installed with SCR denitrification reactor 3, in order to make full use of the oxidation and adsorption of gaseous mercury by flue gas conditioner and SCR catalyst, reduce or avoid unnecessary derivative The flue gas conditioner can also be directly placed in the middle or downstream of the SCR denitrification reactor 3 to enhance oxidation or adsorption of mercury and reduce the contact time between the flue gas conditioner / SCR catalyst and other flue gas components. The oxidized mercury and particulate mercury are mainly collected and removed by the desulfurization absorption tower and dust collector (electrostatic, cloth bag, or electric bag).

Embodiment 3

[0042] Embodiment three see image 3 As shown, in the flue gas system of a coal-fired power plant installed with SCR denitrification reactor 3, the flue gas conditioner is placed at the outlet of the SCR, and the flue gas demercury is implemented through the direct reaction of the flue gas conditioner itself with mercury vapor .

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Abstract

The invention discloses a flue gas conditioning agent for flue gas mercury removal and a composite flue gas purifying method thereof. The flue gas conditioning agent is ammonium bromide powder or ammonium bromide solution. The flue gas conditioning agent is put into a flue of a combustion system at 150-450 DEG C and activated by use of the temperature of the flue gas; the activated flue gas conditioning agent reinforces conversion of the elemental mercury steam to mercury oxide and particle mercury in a flue gas environment, and the activation of the flue gas conditioning agent and the oxidation and adsorption of mercury are performed at the same time; and then the flue gas mercury removal is realized by use of the existing flue gas purifying equipment of the system. According to the flue gas conditioning agent and the composite flue gas purifying method disclosed by the invention, the flue gas is subjected to trace conditioning at specific temperature, and the gas-phase oxidation or gas-solid catalytic oxidation process of the mercury steam in the flue gas environment is reinforced so as to change the state of mercury in the flue gas; and finally, the flue gas mercury removal is realized by use of the existing purifying equipment of the system. The use of an activated carbon-based adsorbent can be avoided, and the flue gas mercury removal is realized by use of the existing equipment while maintaining the reusing value of fly ash.

Description

technical field [0001] The present invention relates to flue gas purification technology for mercury emission reduction in fuel combustion flue gas, especially a flue gas conditioner for synergistic emission reduction of mercury in any combustion system equipped with dust removal, sulfur removal, and denitrification equipment, And a method for purifying flue gas with the flue gas conditioner. Background technique [0002] Mercury is a heavy metal pollutant that can enter the human body through inhalation, skin contact, diet, etc., and endanger human health. Studies have shown that mercury can cause birth defects in the central nervous system of fetuses, language and motor development delays in children, autism in children, and cardiovascular diseases in adults. (Castotti et al., Methylmercury Toxicity to Human Nerves: Influencing Factors and Risks, Journal of General Toxicology, 2008, 51: 201-204) Mercury can enter the environment through many channels, among which coal com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64B01D53/75F23J15/04
Inventor 庄烨刘科伟路光杰
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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