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Method for resourceful treatment garbage incineration fly ash by plasma torch

A technology of waste incineration fly ash and plasma torch, applied in the field of fly ash treatment, can solve problems such as insufficient thoroughness and secondary pollution

Active Publication Date: 2017-07-28
JIANGSU TIANYING PLASMA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention lies in the fact that the existing methods for treating waste incineration fly ash are not thorough enough and easily cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix the fly ash and construction waste evenly, compress them into flakes through a roller press, and then go through crushing, sizing and screening processes to obtain granular materials with an average particle size of 32mm, and pass the granular materials into the plasma torch melting furnace In the process, oxygen is used as the working carrier gas of the plasma torch, and the temperature of the melting furnace is 1500°C. The melted fly ash is cooled by air to obtain a glassy object; the flue gas in the melting furnace is discharged, and is successively passed into the heat exchange device 1 and the heat exchange device. Heat device two, in which heat exchange device one reduces the flue gas temperature to 1000°C, NaCl and KCl are separated, heat exchange device two reduces the flue gas temperature to 400°C, FeCl 2 , ZnCl 2 and other substances are separated; the flue gas from the heat exchange device 2 is passed into water to recover HCl, and the water-insoluble flu...

Embodiment 2

[0031] Mix the fly ash and cullet evenly, compress it into flakes through a roller press, and then go through crushing, sizing and screening processes to obtain granular materials with an average particle size of 25mm. In this material, the mass ratio of Ca to Si is 4.0 , the granular material is passed into the plasma torch melting furnace, oxygen is used as the plasma torch working carrier gas, the temperature of the melting furnace is 1300°C, and the melted fly ash is cooled by air to obtain a glassy object; The flue gas is discharged and passed into the heat exchange device 1 and the heat exchange device 2 successively. The heat exchange device 1 reduces the temperature of the flue gas to 980°C, NaCl and KCl are separated, and the heat exchange device 2 reduces the temperature of the flue gas to 390°C , FeCl 2 , ZnCl 2 and other substances are separated, and the separated FeCl 2 , ZnCl 2 After dissolving in water, use NaOH to adjust the pH value to 12 to obtain solid hy...

Embodiment 3

[0033]The fly ash is evenly mixed with the waste incineration bottom slag, which has a relatively high Si content, and is compressed into flakes by a roller press, and then crushed, granulated and screened to obtain granular materials with an average particle size of 20mm. The granular material is passed into the plasma torch melting furnace, and oxygen is used as the plasma torch working carrier gas. It is discharged into heat exchange device 1 and heat exchange device 2 successively. Heat exchange device 1 reduces the flue gas temperature to 900°C, NaCl and KCl are separated, heat exchange device 2 reduces the flue gas temperature to 400°C, and FeCl 2 , ZnCl 2 and other substances are separated; pass the flue gas from the heat exchange device 2 into water to recover HCl; pass the water-insoluble flue gas into Ca(OH) 2 , recovery of SO 2 . The gas treated above is finally discharged to meet the emission standard.

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Abstract

The invention provides a method for resourceful treatment garbage incineration fly ash by a plasma torch. Raw materials are pretreated through adding such other silicon-contained wastes as household garbage incineration bottom slag, cullet and construction wastes and high-heat-value liquid dangerous wastes into fly ash by a forming method; the treated raw materials are fed in a transfer arc plasma torch melting furnace with oxygen as working gas through a feeding unit; a molten fly ash melt is cooled by air cooling to form a glass body; tail gas generated in the furnace firstly removes chlorine salt by a salts collecting and purifying unit, and enters an acid recovery unit to recover HCl and enters an SO2 recovery unit to recover SO2, so that the tail gas is harmlessly treated; sludge generated in the treatment process is returned into the furnace; waste water is reused; heat is recovered; and when the harmless reduction treatment is performed for dioxin in the fly ash and cured heavy metal, no waste water and no waste slag are discharged.

Description

technical field [0001] The invention relates to the field of fly ash treatment, in particular to a method for utilizing a plasma torch to recycle waste incineration fly ash. Background technique [0002] With the deepening of industrialization, informatization and urbanization in our country and the rapid development of modern society, environmental pollution is becoming more and more serious. Continuous smog and high PM2.5 are closely related to public health, thus increasing public awareness of air pollution. One of the main sources of PM2.5 is the incineration of waste such as garbage. Since 1979, the total amount of urban domestic waste in my country has grown at an average rate of about 9% per year, and a few megacities have exceeded this rate. Over the years, the total amount of waste piled up in disorder across the country has reached 8 billion tons. Air and groundwater resources have been seriously polluted. [0003] For a long time, methods such as sanitary landfil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C22B7/00C22B19/30C22B19/20
CPCB09B3/00B09B5/00C22B7/001C22B7/006C22B19/20C22B19/30Y02P10/20Y02W30/20Y02W30/58
Inventor 杨帆孙钟华李哲田君国李要建李军陈竹严圣军
Owner JIANGSU TIANYING PLASMA TECH CO LTD
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