Water washing and softening system for waste incineration fly ash

Abstract

The invention discloses a water-washing softening system for waste incineration fly ash. The filtrate outlet of a first-stage centrifuge B is sequentially communicated with a first intermediate water pond, a first reaction pond, a second reaction pond, a decalcification transfer tank and a decalcification centrifuge, wherein the filter cake outlet of the decalcification centrifuge is communicated with a second-stage filtrate tank; the filtrate outlet of the decalcification centrifuge is sequentially communicated with a second intermediate water pond, a water quality stabilization reaction pond, a first-stage stabilization regulating pond, a second-stage stabilization regulating pond, a filtration system, a PH regulating pond, a stabilized water pond, a MVR evaporator and a clean water pond; an alkaline solution storage tank is respectively communicated with the first intermediate water pond and the water quality stabilization reaction pond; sludge outlets of the first-stage stabilization regulating pond and the second-stage stabilization regulating pond are respectively communicated with a slurry storage pond, and the slurry storage pond is communicated with a first-stage filtrate tank through a pipeline. The water-washing softening system for waste incineration fly ash disclosed by the invention solves the problem that the content of chlorine in filter cakes is high, and two portions of sludge are respectively treated and are not deposited to block pipes, the performance is stable and reliable, the treatment effect is good and the quality of outlet water is stable.

Description

technical field [0001] The invention belongs to the technical field of waste incineration fly ash treatment, in particular to a water washing and softening system for waste incineration fly ash. Background technique [0002] Using cement kilns to co-process waste incineration fly ash project is to reuse the fly ash collected after municipal solid waste incineration. The main process is to wash the collected fly ash, and then burn the remaining fly ash to cement. After the wastewater generated by water washing is collected, treated, and meets the requirements for reuse, it can be reused for fly ash washing. [0003] The reason why the fly ash must be washed with water is because the fly ash contains a large amount of Cl - , if it is not removed, it will affect the quality of cement, that is, only the cl - Only when it is removed can it be disposed of in a cement kiln. At present, the way to remove high-concentration chloride ions is mainly to wash the fly ash with water, t...

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Problems solved by technology

[0007] 3. The sedimentation tank is directly connected to the evaporator, that is, the coarsely adjusted sewage is directly discharged into the clear water tank. Once the sludge volume is large and the sedimentation effect is not good, it will directly lead to excessive sludge volume in the evaporation system, causing a series of production Fault, the water output is unstable, which seriously affects the water output

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