化工学报 ›› 2023, Vol. 74 ›› Issue (7): 3028-3037.DOI: 10.11949/0438-1157.20230339
张孟斌1(), 李锐1, 张嘉杰1(), 马素霞1, 张建胜2
收稿日期:
2023-04-06
修回日期:
2023-06-09
出版日期:
2023-07-05
发布日期:
2023-08-31
通讯作者:
张嘉杰
作者简介:
张孟斌(1998—),男,硕士研究生,18406599625@163.com
基金资助:
Mengbin ZHANG1(), Rui LI1, Jiajie ZHANG1(), Suxia MA1, Jiansheng ZHANG2
Received:
2023-04-06
Revised:
2023-06-09
Online:
2023-07-05
Published:
2023-08-31
Contact:
Jiajie ZHANG
摘要:
针对工业锅炉灰渣沉积监测的需求,基于共面电容原理对煤炭灰渣在高温下的电容特性进行测试,通过XRD与SEM分析淬冷灰渣的物相结构与微观形貌,并结合宽频介电谱仪研究温度、频率、组分对灰渣介电性能的影响规律。结果表明,随着温度的升高(>700℃),灰渣物相中形成镁铁尖晶石且晶粒尺寸逐渐增大,灰渣复阻抗谱符合IBLC电介质模型,导致灰渣介电常数和测试电容值逐渐增大,基准渣在1200℃时的电容值约为700℃的282.0倍;Si/Al的变化对灰渣的介电性能影响不大,随着Fe2O3含量的增加或CaO含量的减小,灰渣中的晶粒尺寸逐渐增大,导致介电常数增加,因此测试电容值增大。
中图分类号:
张孟斌, 李锐, 张嘉杰, 马素霞, 张建胜. 基于共面电容原理的煤炭灰渣介电特性实验研究[J]. 化工学报, 2023, 74(7): 3028-3037.
Mengbin ZHANG, Rui LI, Jiajie ZHANG, Suxia MA, Jiansheng ZHANG. Experimental study on dielectric properties of coal ash based on coplanar capacitance principle[J]. CIESC Journal, 2023, 74(7): 3028-3037.
灰样 | SiO2/% (质量) | Al2O3/% (质量) | CaO/% (质量) | Fe2O3/% (质量) | MgO/% (质量) |
---|---|---|---|---|---|
#1 | 38.56 | 15.03 | 20.08 | 19.29 | 7.04 |
#2 | 17.86 | 35.73 | 20.08 | 19.29 | 7.04 |
#3 | 43.85 | 9.74 | 20.08 | 19.29 | 7.04 |
#4 | 43.00 | 16.76 | 22.39 | 10.00 | 7.85 |
#5 | 33.43 | 13.04 | 17.42 | 30.00 | 6.11 |
#6 | 43.42 | 16.93 | 10.00 | 21.72 | 7.93 |
#7 | 33.77 | 13.16 | 30.00 | 16.90 | 6.17 |
表1 灰渣样品组分
Table 1 Components of ash sample
灰样 | SiO2/% (质量) | Al2O3/% (质量) | CaO/% (质量) | Fe2O3/% (质量) | MgO/% (质量) |
---|---|---|---|---|---|
#1 | 38.56 | 15.03 | 20.08 | 19.29 | 7.04 |
#2 | 17.86 | 35.73 | 20.08 | 19.29 | 7.04 |
#3 | 43.85 | 9.74 | 20.08 | 19.29 | 7.04 |
#4 | 43.00 | 16.76 | 22.39 | 10.00 | 7.85 |
#5 | 33.43 | 13.04 | 17.42 | 30.00 | 6.11 |
#6 | 43.42 | 16.93 | 10.00 | 21.72 | 7.93 |
#7 | 33.77 | 13.16 | 30.00 | 16.90 | 6.17 |
图9 不同Si/Al淬冷灰渣的XRD谱图1—石英(SiO2); 2—赤铁矿(Fe2O3); 3—方镁石(MgO); 4—镁铁尖晶石(MgFe2O4); 5—镁硅钙石[Ca3Mg(SiO4)2]
Fig.9 XRD patterns of quenched ash with different Si/Al
图12 不同Fe2O3比例淬冷灰渣的XRD谱图1—石英(SiO2); 2—赤铁矿(Fe2O3); 3—方镁石(MgO); 4—镁铁尖晶石(MgFe2O4); 5—镁硅钙石[Ca3Mg(SiO4)2]
Fig.12 XRD patterns of ash with different Fe2O3 ratios
图15 不同CaO比例淬冷灰渣的XRD谱图1—石英(SiO2); 2—赤铁矿(Fe2O3); 3—方镁石(MgO); 4—镁铁尖晶石(MgFe2O4); 5—镁硅钙石[Ca3Mg(SiO4)2]; 6—透辉石(CaMgSi2O6); 7—钙铝黄长石(Ca2Al2SiO7)
Fig.15 XRD patterns of quenched ash with different CaO ratios
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