Efficient denitration and dust removal system and method for garbage power plant flue gas

Abstract

The invention discloses efficient denitration and dust removal system and method for flue gas of a garbage power plant. The dust removal system comprises a waste heat boiler; an SNCR sprayer is mounted in the waste heat boiler and is used for spraying ammonia or urea, so that NOx in the flue gas is primarily reduced, and primary denitration is completed; the high-temperature metal dust remover isused for filtering and intercepting heavy metals, dust and dioxin in the flue gas; the filtered flue gas selectively reacts with NOx under the action of a catalyst through a microporous SCR device togenerate N2 and H2O so as to complete deep denitration; initial deacidification is carried out to the denitrified flue gas in a deacidification device, and deep deacidification and dust removal are carried out in a wet-process tower, thereby achieving ultra-low emission. According to the system and the method, high-temperature dust removal is combined with microporous SCR to deeply remove pollutants such as dust and NOx, so that ultra-low emission is realized. The technology does not need high-temperature steam heating, a large amount of steam can be saved, and the power generation amount is increased.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a high-efficiency denitrification and dust removal system and method for flue gas of a garbage power plant. Background technique [0002] In waste-to-energy plants, in addition to ash that should be specially treated after incineration, the flue gas also contains a large amount of pollutants, which should be specially treated before being discharged into the atmosphere. The main pollutants in the flue gas include soot, SO 2 , HCl, NOx, dioxins (PCDD / PCDF, etc.), heavy metals, etc., and now the NOx concentration for ultra-low emissions is 50mg / m 3 Below, the current ultra-low flue gas denitrification technology in traditional waste-to-energy plants uses selective non-catalytic reduction (SNCR) in the furnace, and high-temperature steam heating (SGH) is used after the desulfurization tower outside the furnace to arrange + selective catalytic reduction ( Selective C...

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Problems solved by technology

[0002] In waste-to-energy plants, in addition to ash that should be specially treated after incineration, the flue gas also contains a large amount of pollutants, which should be specially treated before being discharged into the atmosphere. The main pollutants in the flue gas include soot, SO 2 , HCl, NOx, dioxins (PCDD / PCDF, etc.), heavy metals, etc., and now the NOx concentration for ultra-low emissions is 50mg / m 3 Below, the current ultra-low flue gas denitrification technology in traditional waste-to-energy plants uses selective non-catalytic reduction (SNCR) in the furnace, and high-temperature steam heating (SGH) is used after the desulfurization tower outside the furnace to arrange + selective catalytic reduction ( Selective Catalytic Reduction) SCR device, which requires a large amount of high-quality steam, which is likely to cause ammonia escape and increase the dust content in the flue gas

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