Full Text:   <1250>

Summary:  <514>

CLC number: TQ534

On-line Access: 2015-03-04

Received: 2014-06-15

Revision Accepted: 2014-11-20

Crosschecked: 2015-02-10

Cited: 3

Clicked: 1962

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hao Zhou

http://orcid.org/0000-0001-9779-7703

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.3 P.204-216

http://doi.org/10.1631/jzus.A1400172


Research on the slagging characteristics of blended coals in a pilot-scale furnace


Author(s):  Hao Zhou, Le-tian Li, Hai-long Zhang, Bin Zhou

Affiliation(s):  Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   zhouhao@zju.edu.cn

Key Words:  Blended coal, Ash deposit, Slagging, Charge-coupled device (CCD) camera, Mineralogy


Hao Zhou, Le-tian Li, Hai-long Zhang, Bin Zhou. Research on the slagging characteristics of blended coals in a pilot-scale furnace[J]. Journal of Zhejiang University Science A, 2015, 16(3): 204-216.

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Abstract: 
This paper applies digital image techniques to observe the slagging characteristics of blended coals in a pilot-scale furnace. Collected deposit samples were analyzed by scanning electron microscopy linked with energy-dispersive X-ray analysis (SEM-EDX), X-ray diffraction (XRD), and X-ray Fluorescence (XRF) to acquire the microstructure, chemical composition, and mineralogy. The deposit thickness of three blends was analyzed between their parent coal A (Datong) and coal B (Shan), and we noted that the time to reach a stable stage decreased with the ratio of coal B. The addition of coal A into coal B could remarkably restrained the growth and thickness of ash deposits. The results of XRD analysis indicated the initial layer was predominantly comprised of the crystalline minerals quartz, anorthite, or albite except for coal B. All of the blends and coals contained quartz and Ca- to Al-silicates (Ca0.68Na0.32)(Al1.68Si0.32)Si2O8 in the slag layer where iron-bearing minerals (e.g., ilvaite) were altered into an amorphous phase. The result of SEM-EDX suggested that there was an elemental disparity between the coal ash and deposit.

This is a well-written paper containing interesting results. It online investigated the effects of coal blending on the characteristics of slagging by CCD. This can promote the understanding slagging characteristics of blended coals.

中试台架上混煤结渣特性实验研究

目的:混煤掺烧方式广泛应用于电站的实际生产中,但实际生产中出现了比源煤更为严重的结渣情况。为了研究混煤结渣特性,本文在中试台架上进行混煤结渣实验。
创新点:在实验过程中采用CCD相机全程监控灰渣生长情况,通过对图片进行图像处理,可以获取灰渣的动态生长情况,更为详细地了解结渣特性。
方法:1. 在中试台架上燃烧不同比例配制的大同煤和陕煤的混煤,插入结渣探针和CCD探针进行结渣实验;2. 对煤灰进行X射线荧光(XRF)分析获取氧化物含量;3. 对灰渣横截面进行扫描电子显微术-能量色散X射线分析(SEM-EDX),取不同层的粉末进行X射线衍射(XRD)分析。
结论:1. 混煤结渣厚度随着陕煤比例的增加而增加;2. 各工况下结渣达到稳态所需时间随着陕煤比例增加而增加;3. 灰渣截面都出现了明显的分层情况,主要元素在飞灰和灰渣之间有明显的选择性沉积。

关键词:混煤;灰沉积;结渣;CCD相机;矿物学

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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