含V和Ni灰高温流动性的调控研究

王志刚; 白进; 孔令学; 李怀柱; 白宗庆; 李文

含V和Ni灰高温流动性的调控研究

1.
德州学院化学化工学院, 山东德州 253023
2.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001

基金项目:

山东省自然科学基金 ZR2016BL23

国家自然科学基金 21706027

国家自然科学基金 21476247

国家自然科学基金 21406254

德州学院科技计划 2016kjrc11

详细信息

通讯作者:
白进, Tel:0531-4048967, E-mail:stone@sxicc.ac.cn

本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813).
中图分类号: TQ53
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-10
- 修回日期: 2017-08-17
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-10-10

Regulation of high temperature flow properties of ash containing V and Ni

1.
Department of Chemistry, Dezhou University, Dezhou 253023, China
2.
State Key Lab of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds:

The Natural Science Foundation of Shandong Province ZR2016BL23

the National Natural Science Foundation of China 21706027

the National Natural Science Foundation of China 21476247

the National Natural Science Foundation of China 21406254

Science and technology project of Dezhou university 2016kjrc11

摘要

摘要: 以三种含V和Ni灰为研究对象，探索通过添加助剂和配煤两种途径来调控含V和Ni灰的流动性，利用XRD、SEM-EDX和三元相图等分析方法，探究了两种方法调控含V和Ni灰流动性的机理。结果表明，灰中V和Ni在高温下形成难熔物钒氧矿和单质镍，配煤和添加CaO降低了V和Ni的含量，同时可降低除V和Ni以外灰组成的液相温度，进而降低灰的熔融温度。当灰中V和Ni的总含量低于30%时，配入助熔剂CaO可明显降低灰的熔融温度，但其黏温曲线转变为结晶渣类型。当灰中V和Ni含量高于30%时，需通过配入低熔点煤灰降低熔融温度，在满足气流床排渣要求的煤灰中配入5%的该灰后，其黏温特性仍满足气流床液态排渣的要求，但配比达到10%时，降温过程中析出大量的富钒尖晶石，使灰渣黏温曲线转变为结晶渣类型，其不再适合气流床液态排渣的要求。
- 灰 /
- 熔融性 /
- 黏温特性 /
- 调控
Abstract: Three ashes containing V and Ni were preparation for the study. CaO addition and coal ash blending were chosen for regulation of high temperature flow properties. The regulation mechanism was explored by XRD, SEM-EDX and ternary phase diagram analysis. The results show that karelianite and Ni are main refractory matters in petroleum coke ash at high temperature. CaO addition and coal ash blending decrease the liquid temperatures of ash components except V and Ni, which reduces the ash fusion temperatures. When the contents of V and Ni are fewer than 30% in ash, CaO can obviously decrease the fusion temperature of ash, and the viscosity-temperature property becomes crystal type. When the contents of V and Ni are higher than 30% in ash, coal ash blending is an effective method to decrease the fusion temperature. In this condition, 5% of coal ash blending ratio is required, and its viscosity-temperature property is suitable for slag tapping, but when the coal ash proportion is 10% the viscosity-temperature property of ash becomes crystal type for the precipitation of vanadium-rich spinel, which cannot meet the requirement of slag tapping.
- ash /
- fusion property /
- viscosity-temperature property /
- regulation
注释:

1) 本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813).

HTML全文

图 1 三种灰样1500℃激冷渣的XRD谱图

Figure 1 XRD patterns of the ash samples at 1500℃

An: anorthite (CaAl₂Si₂O₈); Ni: nikel(Ni); Pe: pentlanlite (Ni₉S₈); V: V₂O₃

下载: 全尺寸图片幻灯片

图 2 灰熔融温度随CaO含量的变化

Figure 2 Influences of CaO on AFT

(a): P1; (b): P3

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图 3 不同温度下添加16%CaO的P1灰渣的XRD谱图

Figure 3 XRD patterns of P1 with 16% CaO at different temperatures

L: lime (CaO); An: anorthite (CaAl₂Si₂O₈); V: V₂O₃; C1: orthovanadate(Ca₃V₂O₈)

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图 4 SiO₂-Al₂O₃-CaO三元组分相图

Figure 4 Ternary equilibrium phase diagram for SiO₂-Al₂O₃-CaO

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图 5 CC灰与P2灰混配后的熔融温度

Figure 5 AFT of CC ash blended with P2

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图 6 XLT灰与P3灰混配后的熔融温度

Figure 6 AFT of XLT ash blended with P3

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图 7 P1灰样配入16%CaO后的黏温曲线

Figure 7 Viscosity-temperature curves for P1 with 16% CaO addition(Figure(a) and (b) with different coordinate ranges)

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图 8 添加16%CaO的P1灰测定黏度后灰渣的XRD谱图

Figure 8 XRD patterns of P1 slag with 16% CaO addition

An: anorthite (CaAl₂Si₂O₈); V: V₂O₃

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图 9 CC灰样与P2混配后的黏温曲线

Figure 9 Viscosity-temperature curves of CC blended with P2(Figure(a) and (b) with different coordinate ranges)

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图 10 添加16%CaO的P1灰渣SEM照片

Figure 10 SEM of P1 with 16% CaO addition((a): quenched slag; (b): slag after viscosity test)

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表 1 实验用灰样灰的成分分析

Table 1 Chemical composition of ashes

Sample	Content w /%
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	TiO₂	SO₃	K₂O	Na₂O	NiO	V₂O₅
P1	33.47	22.21	2.46	11.59	0.86	0.83	1.09	0.58	0.98	0.00	25.93
P2	20.82	13.98	18.03	6.52	1.43	0.38	2.67	0.55	0.88	12.00	22.74
P3	43.41	14.82	9.41	4.24	1.36	0.62	0.56	1.75	0.46	2.68	20.69
CC	45.38	29.99	3.41	15.64	1.16	1.12	1.64	0.78	0.88	-	-
XLT	34.87	11.78	11.69	27.93	2.80	0.70	9.72	0.43	0.08	-	-

下载: 导出CSV

表 2 煤灰样品熔融特征温度

Table 2 Ash fusion temperatures of coal ash samples

Sample	Temperature t/℃
Sample	DT	ST	HT	FT
P1	1381	1435	1487	1518
P2	1507	1532	++	++
P3	1439	1505	1548	++
CC	1358	1367	1381	1401
XLT	1115	1150	1157	1162

下载: 导出CSV

表 3 添加16%CaO的P1灰渣的能谱分析

Table 3 EDX analysis results of P1 with 16% CaO addition

Sample	EDX analysis results w /%
Sample	V	Al	Si	Ca	Fe	Mg	K	Na	O
1	75.09	10.02	0.00	0.00	1.53	0.00	0.00	0.00	13.36
2	68.91	14.74	0.00	0.00	3.26	0.00	0.00	0.00	13.09
3	31.96	12.72	18.07	5.81	12.72	1.15	0.00	0.00	20.07

下载: 导出CSV

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