Method for treating incineration tail gas of solid hazardous waste

Abstract

The invention discloses a method for treating incineration tail gas of solid hazardous waste, comprising the following steps of: (1) taking manganese dioxide as the oxidant, adding water to prepare a sizing agent; (2) delivering the size into the smoke absorption tower, spraying the sizing agent in mist, wherein the pressurized smoke with the wind pressure of 1500-5000pa is introduced from the bottom of the tower, the gas inlet tubes are dispersed tubes under the liquid level of the recovery liquid at the tower bottom, wherein the temperature T of the tower bottom recovery liquid is controlled to be not below 5 DEGC and not above 90 DEG C, and the pH value is not less than 3.8; (3) separating the precipitation from the recovery liquid at the tower bottom, preparing manganese sulfate via the solution, and recovering the heavy metal from the bottom dross; (4) discharging the tail gas which is up to the standard. The method for treating incineration tail gas of solid hazardous waste has simple process flow, non-fouling equipment, smooth circulation, less equipment, and low operation cost; and the composite rate of removing the harmful substances reaches 98.5%. The heavy metals can be recovered from the bottom dross; the recycle and the harmlessness can be realized without secondary pollutant products.

Description

technical field [0001] The invention relates to a treatment method for solid hazardous waste incineration tail gas, especially for removing SO from hazardous waste incineration tail gas 2 , HF, HCl, NO X , NH 3 , heavy metal dust and other harmful ingredients. Background technique [0002] Incineration treatment is an effective method for the harmless and reduction treatment of various industrial wastes, medical wastes, domestic wastes, etc. Incineration flue gas inevitably contains SO 2 , nitrogen oxides, CO, NH 3 , HF, HCl, As 2 o 3 , dioxin and heavy metal elements and other harmful ingredients. Among the traditional treatment methods, the physical method includes cloth bag or water washing and dust removal, and the chemical method includes deacidification treatment methods, such as alkali method, calcium method, ammonia method, etc. The alkali method uses alkaline washing liquid to desulfurize, and the product is hazardous waste; domestic 90% of the industry adop...

AI Technical Summary

Problems solved by technology

The publication number is CN101099921C, which discloses a solid waste incineration tail gas treatment method and device. It adopts calcium method to deacidify and then bag dust removal. The problem of waste residue is not solved, and the process is more complicated.

Various existing wet treatment processes have complex processes, many equipments, large project investment, low purification rate, and secondary pollution problems

In the prior art, there is no one suitable for simultaneous removal of SO from incineration flue gas 2 , HF, HCl, NO X , NH 3 and harmful ingredients such as heavy metal dust

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