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

A technology for harmless treatment and flue gas purification, which is applied in chemical instruments and methods, separation methods, and air quality improvement. The effect of dust treatment difficulty, reduction of activity and secondary pollution, and elimination of crystallization problems

Active Publication Date: 2015-01-07
宝武集团环境资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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Effect test

Embodiment 1

[0066] Embodiment 1 A power plant in Shanghai

[0067] Before the transformation of flue gas treatment, "SNCR+ wet desulfurization" was adopted. After adopting the present invention, spray the iron ammonium complex with a solute concentration of 12% in the temperature range of 900°C to 1000°C in the furnace, and spray sodium fumarate with a solute concentration of 15% in the temperature range of 100°C to 65°C Mixture with phosphate, solute mass ratio 1:4; spray mixture of calcium powder and magnesium powder (1:1~3), activated carbon powder. The content of flue gas pollutants and the leaching toxicity of heavy metals in flue gas dust are shown in Table 2 below.

[0068] Table 2 Flue gas pollutant emission concentration and dust heavy metal leaching concentration

[0069] serial number

[0070] Note: The extraction solution of dust samples is prepared according to HJ299-2007.

Embodiment 2

[0071] Example 2 A waste incineration power plant in the south

[0072] Before the transformation of flue gas treatment, "SCR+wet desulfurization" was adopted. After adopting the present invention, the iron-ammonia complex with a solute concentration of 17% was sprayed in the temperature range of the furnace from 900°C to 1000°C. The solute concentration sprayed in the temperature section is a mixture of sodium fumarate, phosphate, and triazine trisodium salt, the solute mass ratio is 1:0.5:1; the mixture of calcium powder and magnesium powder (1:2~4) ), activated carbon powder. The content of flue gas pollutants and the leaching toxicity of heavy metals in flue gas dust are shown in Table 3.

[0073] Table 3 Flue gas pollutant emission concentration and dust heavy metal leaching concentration

[0074] serial number

[0075] Note: The extraction solution of dust samples is prepared according to HJ299-2007.

Embodiment 3

[0076] Example 3 A waste incineration power plant in Northwest China

[0077] Before the transformation of flue gas treatment, "SCR+wet desulfurization" was adopted. After adopting the present invention, the iron-ammonia complex with a solute concentration of 17% was sprayed in the temperature range of the furnace from 900°C to 1000°C. The solute concentration sprayed in the temperature section is a mixture of sodium fumarate, phosphate, trisodium triazine, the solute mass ratio is 1:0.5:1.5; the mixture of calcium powder and magnesium powder (1:2~4) is sprayed , Activated carbon powder. The content of flue gas pollutants and the leaching toxicity of heavy metals in flue gas dust are shown in Table 4.

[0078] Table 4 Flue gas pollutant emission concentration and dust heavy metal leaching concentration

[0079] serial number

[0080] Note: The extraction solution of dust samples is prepared according to HJ299-2007.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60B01D53/64
CPCY02A50/20
Inventor 胡竹云卢四平秦晓东
Owner 宝武集团环境资源科技有限公司
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