Method of processing refuse burning fly ash through cyclone furnace high temperature melting

Inactive Publication Date: 2005-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defect of high cost of the existing fly ash treatment method, provide a waste incineration that has low treatment cost, strong ability to eliminate dioxin, and can recover valuable metals in fly ash and recycle molten ash after quenching High temperature melting treatment method of fly ash in cyclone furnace

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  • Method of processing refuse burning fly ash through cyclone furnace high temperature melting

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specific Embodiment approach 1

[0006] Specific Embodiment 1: The present embodiment will be specifically described below with reference to FIG. 1 and FIG. 2 . This embodiment is completed by the following steps: 1. Mix the fly ash and coal powder produced after garbage incineration in a ratio of 15-25:75-85 and send them into the cyclone furnace 6 for combustion until high-temperature melting; 2. Make the cyclone furnace 6 The internal combustion is in a reducing state, and the air excess coefficient is maintained at 0.8 to 0.9; 3. Most of the heavy metals in the molten fly ash (a small part of which is sublimated and taken away with the flue gas) sink to the molten slag at the bottom of the cyclone furnace 6 in a liquid state The bottom of the pool 9 is recovered after being discharged from the metal recovery outlet 10 at the bottom of the molten slag pool 9, and the molten ash floating on the liquid metal flows out of the molten slag pool from the molten slag recovery outlet 11, and is used as cement raw m...

specific Embodiment approach 2

[0007] Specific Embodiment 2: The present embodiment will be specifically described below with reference to FIG. 1 . The difference between this embodiment and the first embodiment is that the high-temperature flue gas after the secondary high-temperature combustion chamber 16 is discharged from the high-temperature economizer 22, and then enters the high-temperature air preheater 43, the low-temperature economizer 44, Low-temperature air preheater 45, the exhaust gas temperature is 160-180°C and then sent to the semi-dry reaction tower 46, the rotary sprayer 47 installed in the semi-dry reaction tower 46 sprays lime slurry to remove acid gas, and settles in the semi-dry reaction tower 46. The dust at the bottom of the type reaction tower 46 is sent into the ash bin 48, and the smoke and dust enter the bag filter 49, and before entering the bag filter 49, the dioxins that may be produced in the exhaust gas are sprayed through the activated carbon injector 52, and after passing ...

specific Embodiment approach 3

[0008] Specific embodiment three: this embodiment is completed by the following steps: 1. After the fly ash and coal powder produced after garbage incineration are mixed in a ratio of 15~25:75~85, they are sent into the cyclone furnace 6 and burned to high temperature melting; 2. 1. Keep the combustion in the cyclone furnace 6 in an oxidized state, and keep the air excess coefficient at 1.1 to 1.2; 3. The molten ash in the molten fly ash flows out of the slag pool from the slag recovery outlet 11, and is used as cement raw material after being quenched by water Or recycling of building materials. In this embodiment, liquid metal is not recovered, and the molten slag pool 9 only recovers the quenched glass body for recycling as cement raw material or building material. The present embodiment cancels the tertiary air spout.

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Abstract

The invention relates to a method for processing fly ash after incineration of domestic waste. The high-temperature melting treatment method of fly ash in a garbage incineration is completed by the following steps: 1. The fly ash produced after garbage incineration is mixed with coal powder at a ratio of 15 to 25: 75-85 mixed in a ratio of 75 to 85 and sent to the cyclone furnace 6 for combustion until high-temperature melting; 2. The combustion in the cyclone furnace 6 is in a reduced state; 3. The heavy metals in the fly ash sink to the bottom of the slag pool 9 and are discharged and recovered , and the slag floating on the liquid metal flows out of the slag pool from the slag recovery outlet 11, and is then rapidly cooled by water as cement raw material or building material recycling. The method can not only recover valuable metals in fly ash, decompose dioxin, recover waste heat to generate electricity, but also recycle molten ash as cement raw material or building material after being quenched with water, and has low operating cost. Or the combustion in the cyclone furnace 6 is in an oxidized state, the air excess coefficient is kept at 1.1 to 1.2, and only the quenched glass body is recovered.

Description

Technical field: [0001] The invention relates to a method for processing fly ash after domestic garbage is incinerated. Background technique: [0002] In recent years, with the increasingly serious pollution of domestic garbage in my country, the harmless treatment of garbage has attracted people's attention. The incineration method is one of the effective ways to deal with municipal solid waste. Domestic waste incineration plants generally use lime spray (or slaked lime powder) to remove acid gases in the tail gas; spray activated carbon to absorb dioxins in the flue gas, and use bag dust collectors to , to collect the soot, heavy metals and dioxins in the exhaust gas in the ash collected by the bag filter. (referred to as fly ash) in heavy metals, dioxins seriously exceeded. Fly ash containing a large amount of harmful heavy metals and highly toxic organic dioxins is a hazardous waste. Foreign developed countries usually use solidification to safely bury or burn heavy oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/08F23G5/44F23G7/06
Inventor 别如山李诗媛刘欢鹏赵莹
Owner HARBIN INST OF TECH
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