A new type of waste incineration fly ash pulping water washing and carbon neutral coupling system and method

Abstract

The invention discloses a novel waste incineration fly ash pulping water washing and carbon neutralization coupling system and method. The system includes CO 2 Capture device, multi-phase mixed pulping water washing unit and solid-liquid separation unit. The CO 2 The capture device includes an adsorption furnace and a high-temperature roasting furnace. The multi-phase mixed pulping water washing unit includes a carbonation reaction tank, a fly ash storage tank, a tee pipe and a water washing reaction tank. The carbonation reaction kettle includes a kettle body, a windmill-shaped one-way pipe, a clarinet-shaped pipe and a surrounding microporous pipe. The present invention will CO 2 The gas is charged into the water body to form a carbonic acid solution, and calcium carbonate precipitation is formed by the reaction of carbonic acid and calcium hydroxide, compared with the direct charging of CO in the prior art 2 gas, the present invention first prepares a carbonic acid solution in a low-temperature pressurized environment, which can quickly generate a large amount of carbonate ions for reaction, and can significantly improve the efficiency of fly ash washing and CO 2 utilization rate.

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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