Method and device for disposing waste incineration fly ash in low-energy-consumption, recycling and environment-friendly manner

A waste incineration fly ash and recycling technology, applied in the direction of combustion methods, incinerators, combustion types, etc., can solve the problems of secondary volatilization pollution of heavy metals, poor resource utilization effect, high energy consumption of melting treatment, etc., to reduce disposal costs , Reduce the cost of fly ash disposal, fast heating effect

Pending Publication Date: 2021-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to propose a method of using blast furnace to discharge waste incineration fly ash, especially for the problems of high energy consumption, high cost, poor resource utilization effect and secondary volatilization pollution of heavy metals in the melting process of the existing waste incineration fly ash. Co-processing of high-temperature molten slag and utilizing fly ash

Method used

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  • Method and device for disposing waste incineration fly ash in low-energy-consumption, recycling and environment-friendly manner
  • Method and device for disposing waste incineration fly ash in low-energy-consumption, recycling and environment-friendly manner
  • Method and device for disposing waste incineration fly ash in low-energy-consumption, recycling and environment-friendly manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Turn on the dust removal system fan and run the dust removal system equipment. The molten slag discharged from the blast furnace is divided into a melting furnace that has been heated to above 1400°C and filled with blast furnace slag and the liquid level is above the specified lower limit. The temperature of the blast furnace slag is 1500°C. Fly ash is discharged into the melting furnace later, and as the liquid level of blast furnace slag in the melting furnace rises, the flow rate of fly ash can be gradually increased. The negative pressure of the control system makes the pressure of the flue gas outlet on the top of the melting furnace a slight negative pressure. When the weight or liquid level of blast furnace slag in the melting furnace reaches a certain set value, the discharge of blast furnace slag is stopped. Stop adding fly ash when the amount of fly ash discharged reaches 15% of the total mass of blast furnace slag and fly ash. The melting furnace is contin...

Embodiment 2

[0064] Turn on the dust removal system fan and run the dust removal system equipment. The molten slag discharged from the blast furnace is divided into the melting furnace whose temperature has been raised above 1400°C, and the temperature of the blast furnace slag is 1505°C. Later, the fly ash is discharged into the melting furnace. As the liquid level of the blast furnace slag in the melting furnace rises, the flow rate of the fly ash is gradually increased. The negative pressure of the control system makes the pressure of the flue gas outlet on the top of the melting furnace a slight negative pressure. When the weight or liquid level of blast furnace slag in the melting furnace reaches a certain set value, the discharge of blast furnace slag is stopped. Stop adding fly ash when the amount of fly ash discharged reaches 20% of the total mass of blast furnace slag and fly ash. The melting furnace is continuously heated while the fly ash is discharged into the melting furnace...

Embodiment 3

[0067] Turn on the dust removal system fan and run the dust removal system equipment. The slag in the molten state discharged from the blast furnace is divided into the melting furnace that has been heated to above 1400°C, and the temperature of the blast furnace slag is 1510°C. Later, the fly ash is discharged into the melting furnace, and as the liquid level of the blast furnace slag in the melting furnace rises, the flow rate of the fly ash can be gradually increased. The negative pressure of the control system makes the pressure of the flue gas outlet on the top of the melting furnace a slight negative pressure. When the weight or liquid level of blast furnace slag in the melting furnace reaches a certain set value, the discharge of blast furnace slag is stopped. Stop adding fly ash when the amount of fly ash discharged reaches 25% of the total mass of blast furnace slag and fly ash. The melting furnace is continuously heated while the fly ash is discharged into the melt...

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Abstract

The invention discloses a method and device for disposing waste incineration fly ash in a low-energy-consumption, recycling and environment-friendly manner. The method comprises the following steps that: 1) 1480-1510 DEG C blast furnace slag is added into a melting furnace, fly ash is simultaneously or subsequently added, and an obtained mixture is fully stirred, and the addition amount of the flyash accounts for not more than 25% of the total mass of the blast furnace slag and fly ash; 2) the temperature of the composite slag in the melting furnace is kept at 1400-1450 DEG C, and the reaction time is kept for 20-40 minutes under the temperature; and 3) deslagging, cooling, and water quenching treatment are carried out to obtain powdery water granulated slag, and the powdery water granulated slag is used as cement aggregate after being subjected to fine grinding.

Description

technical field [0001] The invention belongs to the technical field of hazardous solid waste disposal and environmental protection, and specifically relates to a method and device for volume-reducing, harmless and resource-based disposal of waste incineration fly ash. Background technique [0002] Waste incineration power generation is a popularized and popularized technology for the reduction and harmless disposal of urban domestic waste at present. It has large disposal capacity, high efficiency and low cost. The waste incineration process converts the combustibles in the waste into high-temperature flue gas through a high-temperature oxidation reaction, which is used for steam turbine power generation, while the residual ash after the combustion of the inorganic matter and combustible organic matter in the waste becomes ash (bottom slag). During the incineration process of garbage, smoke and dust will be produced, which need to be dedusted and purified before being discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B18/02F23G5/44
CPCC04B40/0039C04B18/023F23G5/44C04B18/141C04B18/08Y02W30/91
Inventor 徐万仁毛晓明王如意李建陈小龙许海法
Owner BAOSHAN IRON & STEEL CO LTD
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