Method for treating incineration tail gas of solid hazardous waste

A hazardous waste and treatment method technology, which is applied in the field of solid hazardous waste incineration tail gas treatment, can solve the problems of unresolved waste residue, large project investment, complex process, etc., and achieve low anti-corrosion requirements, simple process flow, and no equipment. Fouling effect

Inactive Publication Date: 2012-03-28
重庆太锦环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for treating incineration tail gas of solid hazardous waste
  • Method for treating incineration tail gas of solid hazardous waste
  • Method for treating incineration tail gas of solid hazardous waste

Examples

Experimental program
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Embodiment 1

[0030] Section 0031: The treatment flue gas is the incineration flue gas of heavy metal waste, and the slurry made by adding water to manganese dioxide ore powder at a weight ratio of 1:2 to 3 is preferably made of Fe content not less than 3%, CaCO 3 Manganese dioxide ore powder with a content of not less than 2%, the slurry is sent into the flue gas absorption tower, sprayed with fine mist, and the pressurized flue gas with a wind pressure of 1500-5000Pa is introduced into the bottom of the tower, preferably 1500-3000Pa, and the air inlet pipe It is a dispersion tube arranged under the liquid surface of the recovery liquid at the bottom of the tower, and the nozzle of the dispersion tube is arranged at 20-30 cm below the liquid level, and the temperature T range of the recovery liquid at the bottom of the tower is controlled to be 5≤T≤90°C, preferably 40≤T≤70℃, keep the pH value of the spray recovery liquid at the bottom of the tower ≥ 3.8, preferably PH value ≥ 4.2, the dust-...

Embodiment 2

[0034] The treatment flue gas is the incineration flue gas of materials such as medical (medical) waste, discarded medicine and packing material, repeats embodiment 1 by the same step as described, SO 2 , HF, HCl and other acidic harmful gases, and NO X , NH 3 , As and other components are absorbed and oxidized by the slurry liquid, the dust is sprayed and washed into the bottom recovery liquid to be removed from the flue gas, the bottom recovery liquid is precipitated and separated, the solution part is used to produce manganese sulfate, and the bottom slag is used for heavy metal recovery , the treated tail gas meets the emission standards and can be discharged into the atmosphere. The detection status of harmful components before and after treatment is shown in the table below:

[0035] Table 2: Comparison table of harmful components before and after treatment of flue gas from incineration of pharmaceutical (medical) waste, waste drugs and packaging

[0036]

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/46B01D53/50B01D53/68B01D53/56B01D53/58
Inventor 王修海
Owner 重庆太锦环保科技有限公司
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