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A method for reducing the amount of fly ash and the toxicity of fly ash in domestic waste incineration plants

A technology for domestic waste incineration and domestic waste, applied in the field of solid waste treatment, can solve the problems of uncompetitive economic cost, achieve good environmental and social benefits, simple process flow, and simple equipment.

Active Publication Date: 2017-02-22
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In general, the above-mentioned treatment methods require additional addition of chemical agents and additional high-temperature treatment methods, which are not competitive in terms of economic cost. Therefore, how to reduce the output of fly ash in the incineration plant during the incineration process, or change the fly ash Its own components, reducing its heavy metal content, has become an important key point in the control of domestic waste incineration process

Method used

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  • A method for reducing the amount of fly ash and the toxicity of fly ash in domestic waste incineration plants
  • A method for reducing the amount of fly ash and the toxicity of fly ash in domestic waste incineration plants
  • A method for reducing the amount of fly ash and the toxicity of fly ash in domestic waste incineration plants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1, using beige mud and fly ash produced by normal incineration of a domestic waste incineration plant as raw materials, the beige mud is a kind of beige clay, and its main mineral component is quartz (SiO 2 ), illite (K(Al,Fe,Mg)(Si,Al) 4 o 10 (OH) 2 ) and kaolinite (Al 2 Si 2 o 5 (OH) 4 ).

[0056] Mix according to the mass ratio of fly ash: beige mud = 40:60, and crush to a particle size of 0.1mm.

[0057] Then mix the three with the mass ratio of fine grinding medium: mixture of fly ash and beige mud: water=5:0.5:1, and carry out fine grinding with a stirring ball mill, and the fine grinding medium is corundum pellets. In the finely ground material, the mass proportion of particles with a particle size of ≤100 μm is 50%.

[0058] Step 2: Compress the ground fly ash and beige mud into a cylindrical sample under a pressure of 20 MPa.

[0059] Step 3, during the incineration process of domestic waste, put the prepared sample into the incineration furnace a...

Embodiment 2

[0062] In step 1, beige mud and fly ash produced by normal incineration of a domestic waste incineration plant are used as raw materials. The main mineral components of the beige mud are quartz, illite and kaolinite.

[0063] Mix according to the mass ratio of fly ash:beige mud=50:50, and crush to a particle size of 0.5mm.

[0064] The corundum bead is the fine grinding medium again, with the fine grinding medium: the mixture of fly ash and beige mud: the mass proportion of water=6.5:1.2:1 the three are mixed, carry out fine grinding with stirring ball mill; After fine grinding In the material, the mass proportion of particles with a particle size of ≤100 μm is 60%.

[0065] Step 2, pressing the ground fly ash and beige mud into a cylindrical sample under a pressure in the range of 60 MPa.

[0066] Step 3, during the incineration process of domestic waste, the prepared sample is put into the incineration furnace at a certain rate, and the input amount of the sample is 0.4% of...

Embodiment 3

[0069] Step 1. The beige mud and the fly ash produced by normal incineration of a domestic waste incineration plant are used as raw materials. The beige mud is a kind of beige clay, and its main mineral components are quartz, illite and kaolinite.

[0070] Mix according to the mass ratio of fly ash:beige mud=60:40, and crush to a particle size of 1mm.

[0071] Then use the corundum quality ball as the fine grinding medium, mix the three with the fine grinding medium: the mixture of fly ash and beige mud: water=8:2:1 with the fine grinding medium, and carry out fine grinding with a stirring ball mill . In the finely ground material, the mass proportion of particles with a particle size of ≤100 μm is 70%.

[0072] In step 2, the ground fly ash and beige mud are pressed into a cylindrical sample under a pressure ranging from 100 MPa.

[0073] Step 3: During the incineration process of domestic garbage, the prepared samples are put into the incineration furnace at a certain rate...

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Abstract

A method for lowering the quantity and toxicity of the flying ash of a household garbage incineration plant is characterized by including the steps of firstly, mixing cream-colored mud and existing flying ash of the household garbage incineration plant according to a certain proportion, smashing to reach a certain particle size, mixing with fine grinding media according a certain proportion, and performing fine grinding with a stirring ball mill; secondly, pressing the finely-ground flying ash and cream-colored mud into cylindrical samples under certain pressure; thirdly, during household garbage incineration, putting the samples into an incineration hearth at a certain speed, and fully utilizing the waste heat generated by the incineration to perform fast mullite reaction so as to allow generated substances containing mullite to settle to a slag system, to lower the flying ash quantity during the incineration to 40% of the original quantity, and to reduce heavy metal contents in the flying ash. The method has the advantages that the temperature of a household garbage incineration furnace is fully utilized, the method is simple in process, low in cost and free of pollution, subsequent flying ash processing cost and difficulty are lowered, and good economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the treatment of solid waste, in particular to a method for reducing the amount and toxicity of fly ash in domestic waste incineration plants, and belongs to the technical field of environmental protection. Background technique [0002] With the rapid increase of domestic waste in our country, domestic waste incineration technology has made great progress in our country. As of 2013, the incineration of domestic waste in my country has reached more than 23% of the total domestic waste. While greatly reducing the quality and capacity of domestic waste, incineration also produces fly ash that is less than about 5% of the amount of waste incinerated, and because fly ash contains harmful heavy metal elements such as Pb, Cr, Cd, As, etc., according to statistics, the waste About 33% of Pb, 92% of Cd and 45% of Sb migrated into the fly ash, and the fly ash also contains some highly toxic substances such as dioxins, so the fly ash is cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/00C01B33/26
CPCY02P20/129
Inventor 楼紫阳张海英赵由才李安定朱南文
Owner SHANGHAI JIAOTONG UNIV