Method for flue gas purification and dust harmless treatment of refuse incineration power plant

Abstract

The invention discloses a method for flue gas purification and dust harmless treatment of a refuse incineration power plant. The method comprises the following steps: spraying a reducing agent solution to a hearth of a refuse incineration furnace in a temperature range of 900-1,000DEG C; spraying pollutant treatment agents including heavy metal treatment agents and adsorbing agents to a flue in a temperature range of 100-65DEG C, wherein the reducing agent solution is iron ammonia complex, hypophosphite or phosphite, and the heavy metal treatment agents comprise alkyl sodium dithiocarbamate / sylvite, dithio-thiazole, phosphate and polymer thereof and 1,3,5-triazine-2,4,6-trithiol trisodium salt. According to the method disclosed by the invention, the reducing agent solution such as the iron ammonia complex, the hypophosphite and the like is adopted for reducing nitric oxide; the heavy metal treatment agents such as the phosphite, magvac sodium, magvac potassium, trithiol trisodium salts and the like are adopted for purifying and stably treating heavy metals; finally, the adsorbing agents are used to perform a neutralization reaction with sulfur oxide and chloride, so that the stable synchronous treatment of flue gas purification and the heavy metals is realized.

Description

technical field [0001] The invention relates to environmental protection technology, in particular to a method for purifying flue gas and harmless treatment of dust in a garbage incineration power plant. Background technique [0002] Soil acidification and heavy metal pollution have become the most serious problems in my country's environmental pollution control. The flue gas from power plants such as thermal power and domestic waste incineration not only contains a large amount of acid gases such as nitrogen oxides, sulfur oxides, and hydrogen chloride, but also contains a large amount of active heavy metals (Hg, Pb, Cd, etc.), covering the atmosphere, soil and water. The primary pollution control object. [0003] The heavy metal content per kilogram of flue gas treatment dust in domestic waste incineration is shown in Table 1. [0004] Table 1 Unit: mg [0005] Pb Cd Hg Ni Zn Cu Cr As 1500～10000 30～1000 1～200 10～50...

AI Technical Summary

Problems solved by technology

However, ammonia gas has certain hazards, especially liquid ammonia and ammonia water, so there must be enough safe space between its storage area and the outside world

In addition, during the denitrification process, the excess ammonia easily forms ammonium sulfate crystals with sulfur oxides and adsorbs on the flue wall and grille, which not only reduces the flue gas flow rate, but also causes serious corrosion damage to the equipment

[0008] Flue gas desulfurization mainly uses alkaline substances to neutralize acidic sulfur oxides, mainly dry, wet, semi-dry and semi-wet methods, mainly relying on alkalinity to reduce the migration of heavy metals, the passivation ability is very limited, and heavy metals have not been stabilized change

[0009] In short, the existing flue gas treatment process only effectively removes nitrogen oxides and sulfur oxides, but does not passivate dangerous and harmful substances such as heavy metals

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