Novel waste incineration fly ash pulping, washing and carbon neutralization coupling system and method

Abstract

The invention discloses a novel waste incineration fly ash pulping, washing and carbon neutralization coupling system and method. The system comprises a CO2 trapping device, a multi-phase mixed pulping and washing unit and a solid-liquid separation unit. The CO2 trapping device comprises an adsorption furnace and a high-temperature roasting furnace. The multi-phase mixed pulping and washing unit comprises a carbonation reaction kettle, a fly ash storage tank, a three-way pipeline and a washing reaction tank. The carbonation reaction kettle comprises a kettle body, a windmill-shaped one-way pipeline, a clarinet-shaped pipeline and a surrounding microporous pipeline. According to the method, the CO2 gas is filled into the water body to form the carbonic acid solution, and the carbonic acid and the calcium hydroxide react to form the calcium carbonate precipitate, so that compared with the direct filling of the CO2 gas in the prior art, the scheme that the carbonic acid solution is prepared in the low-temperature pressurized environment at first can quickly generate a large number of carbonate ions for the reaction, and the fly ash washing efficiency and the CO2 utilization rate can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of waste incineration fly ash treatment, and in particular relates to a novel waste incineration fly ash pulping water washing and carbon neutralization coupling system and method. Background technique [0002] With the development of my country's domestic waste incineration power generation technology, the harmless treatment rate of municipal solid waste has reached 99.2%, but it is followed by the increasing discharge of waste incineration fly ash year by year. The main components of fly ash are CaO, SiO 2 , Al 2 o 3 , Na 2 O, K 2 Oxides such as O, which also contain heavy metals such as Pb, Cd, Zn, Cu, Cr, and dioxins, are hazardous wastes. The "Technical Specifications for Pollution Control of Domestic Waste Incineration Fly Ash" (HJ1134-2020) stipulates that the soluble chlorine content in the fly ash treatment products should be controlled, and the soluble chlorine can be removed by high temperatu...

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Problems solved by technology

[0003] There are many problems in the existing fly ash washing and pulping process: a large amount of ammonia gas will escape during the fly ash washing process, and a large amount of ammonia gas will be enriched in the closed washing tank, which is prone to explosion accidents; in order to collect fly ash For the release of ammonia gas during the washing process, a gas collection system is installed on the washing tank. However, due to the small particle size of the fly ash, it is easy to cause dust pollution during the feeding and washing stirring process, and the ammonia gas absorption process will be accompanied by the fly ash. Dust, if there is water vapor in the collection pipeline, the ammonia gas absorption pipeline will be blocked after the fly ash absorbs water, resulting in pipeline blockage; the continuous feeding and metering of the fly ash entering the water washing system can be accurately realized

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