A kind of household waste incineration fly ash water dechlorination system and using method

Abstract

The invention discloses a household waste incineration fly ash water dechlorination system and a use method, comprising the following steps: 1) pulping: a fly ash storage bin is fed to a pulping tank through an unloader, and the next step is hydraulic washing. The effluent from the dehydration is mixed to prepare a slurry; 2) Hydraulic elution: including no less than 4 stages of series-connected hydraulic cyclone separation system, the hydraulic cyclone separation system includes a hydraulic cyclone separator and a buffer pool, and the first-stage hydraulic cyclone The effluent from the separator enters the water treatment and reuse system; 3) Diaphragm filter press dehydration: the mud water of the last stage of the hydrocyclone separator is filtered by a diaphragm filter press, and the filter cake enters the cement kiln for co-processing. The method is suitable for water washing pretreatment of waste incineration fly ash containing any chlorine content, and has significant economic benefits.

Description

(1) Technical field [0001] The invention relates to a resource-based pretreatment method used for dechlorination from household waste incineration fly ash water. (2) Background technology [0002] With the continuous advancement of urbanization, the population is getting larger and larger, and the amount of domestic waste generated has increased sharply. Due to the limited urban land, incineration has become an effective method for domestic waste disposal. A large amount of fly ash will be produced during the incineration of waste, which accounts for about 2 to 5% of the amount of waste entering the furnace. Waste incineration fly ash contains silica, alumina, chlorides, heavy metals, dioxins, etc. Among them, heavy metals and dioxins are hazardous wastes strictly controlled by the state, and cannot enter the environment without specific disposal methods. Therefore, timely and safe disposal of waste incineration fly ash has become a very important task. [0003] For the re...

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Problems solved by technology

[0006] Conventional garbage incineration fly ash water elution chlorine is mixed reaction of water and fly ash, and then dehydration and separation through decanter centrifuge and filter press, generally more than three times of reaction and dehydration separation, this type of method has the following disadvantages : 1. High water-cement ratio; 2. The decanter centrifuge is expensive and prone to failure; 3. The filter press equipment is expensive, and the dehydration operation process leads to the intermittent operation of this type of washing scheme, which makes operation and management difficult; 4. Equipment failure High efficiency and high equipment maintenance requirements; 5. High energy consumption in operation

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