Method for efficient carbonation and harmless treatment of waste incineration fly ash

A technology of waste incineration fly ash and carbonation, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of high safety hazards, complex equipment, high energy consumption, and achieve safe operation and disposal costs. The effect of low and low maintenance cost

Active Publication Date: 2022-05-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has problems such as high energy consumption and high potential safety hazards.
Similarly, some scholars have studied the dry carbonation method of fly ash, and improved the carbonation efficiency of fly ash by adjusting the medium and high temperature and water vapor content, but this method has problems such as complicated equipment and high energy consumption.

Method used

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  • Method for efficient carbonation and harmless treatment of waste incineration fly ash
  • Method for efficient carbonation and harmless treatment of waste incineration fly ash
  • Method for efficient carbonation and harmless treatment of waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0047] (1) Take 10kg of fly ash in the bag filter in the domestic waste incineration power plant and pour it into the reactor, and choose a liquid-solid ratio of 5:1 (L / kg), pour 50L of tap water into the reactor, and water- Ash mixed solution is stirred;

[0048] (2) Pass the flue gas (with a carbon dioxide content of 8% to 15%) of the waste incineration power plant into the particle filter, and set the gas flow rate to 200L / min, then pass the gas from the particle filter into the microbubble generator to generate microbubbles. bubble;

[0049] (3) Turn on the ultrasonic transducer, set the ultrasonic frequency range to 28kHz, pass the prepared microbubbles into the reactor through the microbubble inlet on the upper end of the stirrer, turn on the stirrer, adjust the stirring rate to 30rpm, and the gas passes through the stirrer paddle The micro-bubbles on the leaf exit into the reaction solution and react with the alkaline substances (calcium hydroxide, basic calcium chlori...

specific Embodiment 2

[0053] (1) Take 10kg of fly ash in the bag filter in the domestic waste incineration power plant and pour it into the reactor, and choose a liquid-solid ratio of 8:1 (L / kg), pour 80L of tap water into the reactor, and water- Ash mixed solution is stirred;

[0054] (2) Pass the flue gas (with a carbon dioxide content of 8 to 15%) from a coal-fired power plant into the particle filter, set the gas flow rate to 250L / min, and then pass the gas from the particle filter into the microbubble generator to generate microbubbles. bubble;

[0055] (3) Turn on the ultrasonic transducer, set the ultrasonic frequency range to 35kHz, pass the prepared microbubbles into the reactor through the microbubble inlet on the upper end of the stirrer, turn on the stirrer, adjust the stirring rate to 50rpm, and the gas passes through the stirrer paddle The micro-bubbles on the leaf exit into the reaction solution and react with the alkaline substances (calcium hydroxide, basic calcium chloride, etc.)...

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Abstract

The invention relates to a waste gas treatment technology, and aims to provide a method for efficient carbonation and harmless treatment of waste incineration fly ash. Comprising the following steps: uniformly mixing the waste incineration fly ash with water, feeding flue gas containing carbon dioxide into a particle filter, and then feeding filtered gas into a microbubble generator; the method comprises the following steps: feeding microbubbles containing carbon dioxide into a reactor, and carrying out a fly ash carbonation reaction under stirring and ultrasonic conditions to obtain carbonated wet fly ash; and after standing, carrying out drying treatment to obtain blocky carbonated fly ash. The method disclosed by the invention is low in treatment cost and does not need to add any additive; operation is simple and convenient, maintenance cost is low, operation is safe, and high temperature and high pressure are avoided; according to the method, the waste incineration fly ash is subjected to harmless treatment while carbon dioxide is captured, heavy metal is solidified, the alkalinity of the fly ash is reduced, the pH value of a reacted aqueous solution tends to be neutral, and the concentration of the heavy metal reaches the underground water discharge standard.

Description

technical field [0001] The invention relates to a waste gas treatment technology, in particular to a carbon dioxide capture technology and harmless disposal of municipal solid waste incineration fly ash, which efficiently captures carbon dioxide in flue gas and synergistically solidifies heavy metals through fly ash. Background technique [0002] Globally, municipal solid waste incineration technology plays an important role in the harmless treatment process. After domestic waste incineration, the volume is significantly reduced by 85%-90%, and the remaining particle by-products are mainly bottom ash and fly ash, of which the output of fly ash is huge. In general, fly ash captured in baghouses is mainly fly ash from the incineration process and air pollution control residues such as calcium oxide and activated carbon. However, waste incineration fly ash is hazardous waste because it contains a large amount of heavy metals (lead, zinc, chromium, cadmium, nickel, selenium, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/70B09B3/20B09B101/30
CPCB09B3/00
Inventor 林晓青陈杰付琮凯李晓东严建华
Owner ZHEJIANG UNIV
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