Comprehensive stabilization treatment technology of waste incineration fly ash

Abstract

The invention relates to a comprehensive stabilization treatment technology of waste incineration fly ash, aims at the problems of high consumption of lime slurry, large generation amount of fly ash and high treatment difficulty in the smoke treatment process of the waste incineration plant in the prior art and the problems of high chemical adding ratio and low qualified rate of the fly ash in the ordinary stabilization technology, and combines four core technologies of modifying a smoke deacidification agent through a semi-dry process, reinforcing deacidification of smoke through a dry process and pre-stabilizing fly ash, carrying out chemical stable rapid field detection, reinforcing stabilization effect of fly ash and emergently remedying. Through adoption of high-activity, high-efficiency, high-stability and low-dosage chemicals, the comprehensive stabilization purposes of reducing fly ash source, degrading dioxin source, stabilizing components of smoke and fly ash and stabilizing heavy metals in the fly ash are achieved; the fly ash treatment difficulty is greatly reduced; the generation of fly ash is changed into production of fly ash; the purpose of ensuring that the safe treatment rate of the fly ash reaches up to 100% on the premise of controllable cost can be finally achieved.

Description

technical field [0001] The technology relates to a comprehensive stabilization treatment technology for waste incineration fly ash, and belongs to the technical field of hazardous waste treatment and disposal. Background technique [0002] Incineration is considered to be one of the most effective ways to deal with urban and industrial waste, but waste incineration fly ash, as a secondary pollutant produced in the process of waste incineration disposal, contains high concentrations of heavy metals and dioxin-like persistent organic pollutants. are classified as hazardous waste. It is estimated that the annual output of waste incineration fly ash will reach 3.2 million tons by the end of 2015, which will seriously hinder the healthy and sustainable development of the waste incineration industry. At present, the fly ash of waste incineration is generally stabilized and then landfilled. Although it can alleviate the urgent need, as an end-of-life disposal method, it has disadv...

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Problems solved by technology

[0004] At present, activated carbon powder spraying is widely used to adsorb dioxins in the flue gas pollution control facilities of incinerators. The oxins are transferred to the fly ash in the solid phase, but they are not completely removed; another study uses calcium-based inhibitors to interact with the dioxin precursors in the cooling flue gas to inhibit the synthesis of dioxins, but this The method is still the method of spraying lime powder, which leads to an increase in the amount of fly ash, which in turn increases the difficulty of subsequent treatment of fly ash

[0005] Most of the fly ash stabilization process adopts the method of directly adding organic or inorganic heavy metal stabilizers, alkali activators, etc., and it is difficult to determine the reasonable process parameters such as the type of agent and the amount of addition, and stabilizers are common in conventional agent stabilization processes. The problem of high addition ratio and low pass rate of fly ash stabilized products makes it difficult to ensure that the safe disposal rate of fly ash reaches the goal of 100% pass

[0006] The complexity of garbage components leads to complex and fluctuating components of flue gas and fly ash. Traditional single treatment measures are often passive, and it is difficult to achieve the comprehensive treatment of flue gas and fly ash source purification or reduction.

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