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Regulation and control method for low-energy-consumption garbage fly ash melting treatment

A technology of waste fly ash and low energy consumption, which is applied in the control field of low-energy waste fly ash melting treatment, can solve the problems of high cost, secondary pollution of heavy metals, etc., and achieves the effects of easy implementation, maintaining fluidity and wide application range.

Active Publication Date: 2020-02-11
XI AN JIAOTONG UNIV
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages of high cost and secondary pollution of heavy metals in the prior art when the method of melting and solidifying is used to process waste incineration fly ash, and to provide a method for regulating and controlling the melting treatment of waste fly ash with low energy consumption

Method used

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  • Regulation and control method for low-energy-consumption garbage fly ash melting treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 (waste incineration fly ash A)

[0037] Step 1: Component Analysis:

[0038] The mass proportion of the main ash component is: SiO 2 -20.8%, Al 2 o 3 -16.5%, CaO-24.8%, MgO-1.99%, Na 2 O-3.35%, K 2 O-2.17%; After normalization processing, the proportion of each ash composition is: SiO 2 -29.88%, Al 2 o 3 -23.7%, CaO-35.63%, MgO-2.86%, Na 2 O-4.81%, K 2 O - 3.12%.

[0039] Step 2: Judging SiO 2 / Al 2 o 3 The ratio of:

[0040] SiO 2 / Al 2 o 3 Ratio=1.262 ), adjust SiO 2 / Al 2 o 3 The ratio of = 2.6.

[0041] Step 3: Determine (CaO+MgO) / (Na 2 O+K 2 O) ratio:

[0042] (CaO+MgO) / (Na 2 O+K 2 O) ratio=4.85>2, add 17.73% Na in the raw material 2 CO 3 or 177.3% of chemical plant sludge (containing 10% Na 2 CO 3 ), adjust (CaO+MgO) / (Na 2 O+K 2 O) ratio = 1.5.

[0043] Step 4: The adjustment is finished.

Embodiment 2

[0044] Embodiment 2 (waste incineration fly ash B)

[0045] Step 1: Component Analysis:

[0046] The mass proportion of the main ash component is: SiO 2 -4.9%, Al 2 o 3 -3.4%, CaO-38.4%, MgO-2.6%, Na 2 O-12.29%, K 2 O-8.5%, after normalization processing, the proportion of each ash composition is: SiO 2 -6.99%, Al 2 o 3 -4.85%, CaO-54.79%, MgO-3.71%, Na 2 O-17.53%, K 2 O - 12.13%.

[0047] Step 2: Judging SiO 2 / Al 2 o 3 The ratio of:

[0048] SiO 2 / Al 2 o 3 =1.442 ), adjust SiO 2 / Al 2 o 3 The ratio of = 3.

[0049] Step 3: Determine (CaO+MgO) / (Na 2 O+K 2 O) ratio:

[0050] (CaO+MgO) / (Na 2 O+K 2 O) ratio=1.97<2.

[0051] Step 4: The adjustment is finished.

Embodiment 3

[0052] Embodiment 3 (waste incineration fly ash C)

[0053] Step 1: Component Analysis:

[0054] The mass proportion of the main ash component is: SiO 2 -3.5%, Al 2 o 3 -0.9%, CaO-40.5%, MgO-1.1%, Na 2 O-7.9%, K 2 O-8.5%, after normalization processing, the proportion of each ash composition is: SiO 2 -5.61%, Al 2 o 3 -1.44%, CaO-64.9%, MgO-1.76%, Na 2 O-12.66%, K 2 O - 13.62%.

[0055] Step 2: Judging SiO 2 / Al 2 o 3 The ratio of:

[0056] SiO 2 / Al 2 o 3 =3.89>3.5, add 0.3% alumina powder to the raw material, adjust SiO 2 / Al 2 o 3 The ratio of = 3.

[0057] Step 3: Determine (CaO+MgO) / (Na 2 O+K 2 O) ratio:

[0058] (CaO+MgO) / (Na 2 O+K 2 (2) ratio=2.53>2, add 121.1% chemical plant sludge (containing 15% Na 2 CO 3 ), adjust (CaO+MgO) / (Na 2 O+K 2 O) ratio = 1.5.

[0059] Step 4: The adjustment is finished.

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Abstract

The invention discloses a regulation and control method for low-energy-consumption garbage fly ash melting treatment. The regulation and control method utilizes an additive to adjust and optimize themass proportion of main ash components of garbage incineration fly ash, the melting temperature and viscosity of the fly ash are reduced, the purpose of reducing the melting treatment temperature of the fly ash and saving energy consumption is achieved; meanwhile, the viscosity of the fly ash is reduced, so that the fluidity of the fly ash is improved, the fluidity of liquid molten slags is kept,and the recycling of the molten slags is facilitated. According to the regulation and control method, the adjustment of the mass proportion of the components of the garbage incineration fly ash is guided on the basis of a SiO2-Al2O3-(CaO+MgO+Na2O+K2O) pseudo six-element melting temperature map, has the raw material adaptability, is wide in application range, is simple, convenient and reliable, andis easy to perform. Finally, the oxides that need to be added can be obtained in the vicinity without a significant amount of additional expense, and the regulation and control method has higher feasibility and economy; the melting temperature of the molten treatment process of the adjusted garbage incineration fly ash sample is 1100 DEG C-1300 DEG C, the viscosity of the fly ash is effectively reduced, the viscosity of the liquid slags is between 2.5 and 5 Pa .s, and the corresponding flowing temperature is 1110 DEG C-1300 DEG C.

Description

【Technical field】 [0001] The invention belongs to the field of garbage treatment, and relates to a control method for melting treatment of low-energy garbage fly ash. 【Background technique】 [0002] At present, the annual collection of municipal solid waste reaches more than 140 million tons, and it is still growing at a relatively rapid rate. By the end of 2016, 249 domestic waste incineration plants had been put into operation, and the total amount of domestic waste incineration reached 73,784kt / a. Although the incinerated garbage can achieve the purpose of stabilization and reduction, the incinerated garbage will produce fly ash accounting for 1%-5% of the total garbage, mainly containing SiO 2 , CaO, Al 2 o 3 , Fe 2 o 3 And sulfate, sodium salt, potassium salt and other compounds. In addition, fly ash also contains heavy metal elements such as Hg, Mn, Mg, Sn, Cd, Pb, Cr, and trace-level organic substances such as dioxins, as well as other types of pollutants. The i...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/29B09B2101/30
Inventor 吕媛牛艳青韩江霖惠世恩
Owner XI AN JIAOTONG UNIV
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