煤矸石灰添加对准东煤灰熔融特性影响

doi:10.16085/j.issn.1000-6613.2018-1429

化工进展 ›› 2019, Vol. 38 ›› Issue (04): 1714-1720.DOI: 10.16085/j.issn.1000-6613.2018-1429

煤矸石灰添加对准东煤灰熔融特性影响

郑烨¹(),马志斌²,关彦军¹,张锴¹(),程芳琴²

1. 华北电力大学热电生产过程污染物监测与控制北京市重点实验室，北京102206
2. 山西大学资源与环境工程研究所，国家环境保护煤炭废弃物资源化高效利用技术重点实验室，山西太原 030006

收稿日期:2018-07-11 修回日期:2018-09-21 出版日期:2019-04-05 发布日期:2019-04-05
通讯作者: 张锴
作者简介:<named-content content-type="corresp-name">郑烨</named-content>（1987—），男，博士研究生，研究方向为煤灰化学。E-mail：<email>1142102039@ncepu.edu.cn</email>。|张锴，教授，博士生导师，研究方向为煤和生物质绿色转化技术。E-mail：<email>kzhang@ncepu.edu.cn</email>。
基金资助:
国家自然科学基金委与山西煤基低碳联合基金重点项目(U1610254);中央高校基本科研业务费专项(2018ZD03)

Effect of coal gangue ash addition on the fusibility of Zhundong coal ashes

Ye ZHENG¹(),Zhibin MA²,Yanjun GUAN¹,Kai ZHANG¹(),Fangqin CHENG²

1. Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
2. Institute of Resources and Environment Engineering, School of Environmental & Resource Sciences, State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources, Shanxi University, Taiyuan 030006, Shanxi, China

Received:2018-07-11 Revised:2018-09-21 Online:2019-04-05 Published:2019-04-05
Contact: Kai ZHANG

摘要/Abstract

摘要：

选取两种准东煤（ZDA和ZDB）为研究对象，利用灰熔融温度测定仪、X射线荧光光谱和X射线衍射仪考察了单一准东煤灰及其与煤矸石（CG）灰掺混后酸碱比、化学组成和矿物质演变对灰熔融特征温度的影响规律。结果表明高温下ZDA中主要矿物组分为霓辉石和赤铁矿等助熔矿物，而ZDB中以难熔矿物硫铝酸钙与镁硅钙石为主，导致ZDA灰熔融温度明显低于ZDB。随着CG灰质量分数增加，ZDA/CG与ZDB/CG熔融特征温度呈现先下降后上升趋势，分别在CG灰添加比40%和60%时出现最小值；当ZDA/CG与ZDB/CG酸碱比接近时，CaO与Fe₂O₃含量是影响变形温度与流动温度的主要原因。对于上述两种高碱性煤灰，含钙矿物对于灰熔融特性影响较大，而含钠矿物的影响相对较小。本文旨在为改善准东煤灰沉积倾向提供基础数据。

关键词: 准东煤, 煤矸石, 灰熔融温度, 酸碱比, 化学组成, 矿物质演变

Abstract:

The fusibility of two types of Zhundong coal (ZDA and ZDB) ashes and the mixtures with coal gangue (CG) ash was studied by ash fusion test using X-ray diffractometry and X-ray spectrometry. The effect of acid to basic ratio, ash chemistry and mineral transformation on ash fusion temperatures (AFTs) was investigated for both individual and blending ash samples. The results showed that the ash fusion temperature of ZDA was obviously lower than that of ZDB due to more fluxing minerals including augite and hematite in ZDA ash, whilst refractory minerals including yeelinmite and merwinite in the ZDB ash. The AFTs of both blending ashes decreasd first and then increased with the increase in ZDA/CG or ZDB/CG ash ratio. The minimum AFTs were observed with the CG ash ratios of 40% and 60%, respectively. The deformation temperature and flow temperature were mainly attributed to the difference of CaO and Fe₂O₃ weight ratio, as the acid to basic ratio of ZDA/CG was similar to that of ZDB/CG. Compared to the sodium-containing minerals, the calcium-containing minerals play a more important role in the ash fusion characteristics for the high-alkali coal ash. Furthermore, the basic data was obtained for improving ash deposition behavior of Zhundong coal ash in this study.

Key words: Zhundong coal, coal gangue, ash fusion temperature, acid to basic ratio, chemical composition, mineral transformation

中图分类号:

TQ536.4

郑烨, 马志斌, 关彦军, 张锴, 程芳琴. 煤矸石灰添加对准东煤灰熔融特性影响[J]. 化工进展, 2019, 38(04): 1714-1720.

Ye ZHENG, Zhibin MA, Yanjun GUAN, Kai ZHANG, Fangqin CHENG. Effect of coal gangue ash addition on the fusibility of Zhundong coal ashes[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1714-1720.

图/表 9

表1 样品工业分析及灰化学组成分析

样品	工业分析（质量分数）/%				煤灰成分分析（质量分数）/ %
样品	M_ad	A_ad	V_ad	FC_ad	SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	SO₃	Na₂O	TiO₂	K₂O	P₂O₅	MnO₂	A/B
ZDA	10.05	3.24	28.45	58.26	23.64	13.51	12.03	18.56	8.13	15.42	6.73	0.58	0.13	0.54	0.23	0.82
ZDB	8.81	3.44	28.35	59.60	6.51	8.60	36.27	2.15	11.17	24.15	8.28	0.35	0.18	0.02	0.07	0.26
CG	8.90	41.36	22.69	27.05	58.22	24.77	1.16	7.81	1.50	1.13	1.93	0.92	1.97	0.20	0.15	5.77

图1 两种准东煤灰熔融特性

图2 不同温度下准东煤灰XRD图

图3 混合样品熔融温度随添加比例的变化

图4 混合样品化学组成随煤矸石灰添加比例的变化

图5 酸碱比对熔融温度的影响

图6 不同酸碱比时两组掺混样品的化学组成

图7 ZDA灰混合样品不同温度下的XRD图

图8 煤矸石灰和ZDB灰混合样品不同温度下的XRD图

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煤矸石灰添加对准东煤灰熔融特性影响

Effect of coal gangue ash addition on the fusibility of Zhundong coal ashes

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