锯木屑与褐煤共热解生物焦的成浆性能及其流变特性

戴财胜; 刘学鹏; 戴谨泽; 马淞江

锯木屑与褐煤共热解生物焦的成浆性能及其流变特性

1.
湖南科技大学化学化工学院, 湖南湘潭 411201
2.
中国矿业大学(北京) 化学与环境工程学院, 北京 100083

基金项目:

国家自然科学基金 51478182

国际合作专项 2013DFG60060

湖南省研究生科研创新项目 CX2014B419

详细信息

通讯作者:
刘学鹏, Tel: 18773254123, E-mail: 502006383@qq.com

中图分类号: TQ530.2
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- 被引次数: 0
出版历程
- 收稿日期: 2016-01-20
- 修回日期: 2016-04-18
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-07-10

Preparation and rheological property of the char-water slurry based on co-pyrolysis of sawdust and lignite

1.
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Funds:

The project was supported by the National Natural Science Foundation of China 51478182

International S & T Cooperation Program of China 2013DFG60060

Scientific Innovation Program of Graduates in Hunan Province CX2014B419

More Information

Corresponding author: LIU Xue-peng, Tel: 18773254123, E-mail: 502006383@qq.com

摘要

摘要: 模拟外热式直立炭化炉组装热解实验平台对锯木屑、云南褐煤进行热解/共热解提质, 采用成浆实验法研究了锯木屑、云南褐煤热解生物焦/半焦及其共热解生物焦的成浆性能。结果表明, 热解能显著提高锯木屑、云南褐煤的成浆性能, 锯木屑、云南褐煤分别在500 ℃下热解1.5 h, 所得到的生物焦、半焦的成浆浓度分别由热解前的29.21%、54.63%提高至38.57%、60.19%。相同热解条件下, 锯木屑与云南褐煤共热解生物焦的成浆性能明显优于锯木屑、云南褐煤分别单独热解混合焦(生物焦与半焦的混合物) 的成浆性能。锯木屑浆、生物焦浆、共热解生物焦浆、混合生物焦浆等均从总体上表现为假塑性特性, 但当锯木屑含量大于等于50%时, 锯木屑与云南褐煤共热解生物焦浆的流变特性与生物焦浆类似, 在剪切速率较低的条件下, 具有明显的剪切变稠特性, 表现出较强的胀塑性。共热解生物焦的成浆性能优于混合生物焦的原因在于云南褐煤和锯木屑在共热解过程中的协同作用整体增强了共热解生物焦的芳构化程度。
- 锯木屑 /
- 褐煤 /
- 共热解 /
- 生物焦浆 /
- 流变特性
Abstract: An integrated experimental apparatus for pyrolysis/co-pyrolysis was employed to carry out the upgrading process of sawdust, Yunnan lignite, and their blends. The slurry-ability of the upgraded char was investigated. The results show that the slurry-ability of sawdust and Yunnan lignite is significantly improved via pyrolysis process. Bio-char and semi-coke were prepared at 500 ℃ holding 1.5 h. The solid loadings of the resulting slurry fuels derived from sawdust and lignite were enhanced from 29.21% and 54.63% to 38.57% and 60.19%, respectively. Under the same pyrolysis conditions, the slurry-ability of the char prepared from co-pyrolysis of sawdust and Yunnan lignite is apparently superior to that of the corresponding bio-char/coal char mixture with the same original mass ratio of feedstock. The prepared char-water slurries generally display pseudo-plastic behavior, i.e., the shear press decreases with increasing shear rate. When the mass ratio of sawdust exceeds 50%, the rheological property of char-water slurry tend to be shear thickening, exhibiting strong dilatant behavior at low shear rate, which is similar to the rheological property of biochar-water slurry. The desirable slurry-ability of the char produced from co-pyrolysis could be attributed to the synergistic effect of biomass and coal, which is likely to improve aromaticity of the resulting hybrid char.
- sawdust /
- lignite /
- co-prolysis /
- bio-char water slurry /
- rheological property

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图 1 热解实验平台示意图

Figure 1 Pyrolysis experimental facility

1: nitrogen gas cylinder; 2: rotor flowmeter; 3: temperature controlled equipment; 4: resistance furnace; 5: pyrolysis reactor; 6: condensing unit; 7: dry ice; 8: gas-liquid separator; 9: gas bag

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图 2 锯木屑/褐煤及其生物焦/半焦的成浆性能

Figure 2 Slurry-ability of sawdust/lignite and biochar/coal char

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图 3 生物焦浆的表观黏度-浓度关系图

■: w=25%(co-pyrolysis); ○: w=50%(co-pyrolysis); △: w=75%(co-pyrolysis); ▽: w=25%(blended); ●: w=50%(blended); ●: w=75%(blended)

Figure 3 Apparent viscosity-concentration dependence of BCWS

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图 4 云南褐煤浆的流变特性

Figure 4 Rheological properties of CWS

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图 5 锯木屑浆的流变特性

Figure 5 Rheological properties of SWS

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图 6 半焦浆的流变特性

Figure 6 Rheological properties of SCWS

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图 7 生物焦浆的流变特性

Figure 7 Rheological properties of BCWS

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图 8 共热解生物焦浆和混合生物焦浆的流变特性

Figure 8 Rheological properties of co-pyrolysis/blended BCWS

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图 9 热解原料及生物焦的FT-IR谱图

■: YN; : sawdust; ▲: w=25%(co-pyrolysis); ▲: w=0(semi-coke)；♦: w=50%(co-pyrolysis)；◁:w=75%(co-pyrolysis)；▶:w=100%(bio-char)

Figure 9 FT-IR spectrum of samples

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图 10 热解原料及生物焦的芳构化程度

: co-pyrolysis; : blended bio-char; : semi-coke; : YN; : charcoal; : sawdust

Figure 10 Aromatization level of samples

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表 1 样品的工业分析

Table 1 Proximate analysis of samples

Sample	Proximate analysis w_ad/%				Q_{net, a}_d/(MJ·kg^-1)
Sample	M	A	V	FC	Q_{net, a}_d/(MJ·kg^-1)
Sawdust	28.86	0.21	62.28	8.65	19.267
Lignite	31.01	8.20	32.54	28.25	17.278

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表 2 焦的产率及工业分析

Table 2 Yield and proximate analysis of char

Sample	Yield w/%	Proximate analysis w_ad/%				Q_net,_ar/(MJ·kg^-1)
Sample	Yield w/%	M	V	A	FC	Q_net,_ar/(MJ·kg^-1)
Semi-coke (w=0)	45.60	2.96	20.95	13.74	62.35	23.286
Co-pyrolysis biochar (w=25%)	40.65	2.98	23.66	11.22	62.14	23.590
Co-pyrolysis biochar (w=50%)	33.80	4.02	24.59	9.36	62.03	24.944
Co-pyrolysis biochar (w=75%)	25.75	5.70	19.10	7.30	67.90	26.939
Biochar (w=100%)	19.16	5.40	14.37	1.90	78.33	29.858

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表 3 共热解生物焦与混合生物焦成浆性能对比

Table 3 Slurry-ability of co-pyrolysis BCWS and blended BCWS

Sample	φ/%
Sample	co-pyrolysis BCWS	blended BCWS
w=25%	59.36	56.86
w=50%	58.08	50.43
w=75%	50.10	41.65

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表 4 云南褐煤浆及锯木屑浆的流变特性参数

Table 4 Parameters of rheological model for CWS and SWS

Sample	C/%	μ/(mPa·s)	k/(Pa·sⁿ)	n	R²
CWS	64.65	1 005.7	3.405 86	0.723 57	0.998 56
	53.99	812.2	2.562 68	0.741 08	0.998 91
	53.55	738.7	2.534 72	0.722 82	0.996 47
SWS	22.48	202.7	1.031 34	0.649 88	0.996 50
	20.67	47.0	0.893 25	0.392 53	0.985 21

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表 5 半焦浆和生物焦浆的流变特性参数

Table 5 Parameters of rheological model for SCWS and BCWS

Sample	C/%	μ /(mPa·s)	k/(Pa·sⁿ)	n	R²
SCWS	61.57	1 325.2	8.717 54	0.589 47	0.994 65
(w=0)	60.17	995.2	5.971 65	0.588 06	0.988 50
	59.90	735.7	4.073 36	0.620 52	0.987 61
BCWS	31.29	590.2	2.461 12	0.714 08	0.976 87
(w=100%)	40.12	1 087.3	4.600 12	0.705 47	0.986 17

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表 6 共热解生物焦浆和混合生物焦浆的流变特性参数

Table 6 Parameters of rheological model for co-pyrolysis/ blended BCWS

w/%	Co-pyrolysis BCWS					Blended BCWS
w/%	C /%	μ/(mPa·s)	k/(Pa·sⁿ)	n	R²	C /%	μ/(mPa·s)	k/(Pa·sⁿ)	n	R²
25	60.37	1 303.2	5.309 21	0.706 97	0.997 67	57.65	1 155.2	7.690 04	0.583 83	0.999 22
	58.80	832.0	1.570 16	0.849 19	0.999 66	55.69	767.5	4.227 53	0.642 21	0.999 48
	58.49	698.8	1.330 09	0.853 53	0.999 57
	57.67	587.8	0.909 96	0.880 00	0.999 79
50	58.83	1 132.7	1.911 60	0.872 80	0.994 25	50.60	1 038.0	3.560 40	0.752 67	0.997 30
	58.12	1 009.8	1.686 92	0.869 01	0.996 26	48.75	617.2	3.789 04	0.614 14	0.994 91
	57.58	857.0	1.332 04	0.882 70	0.996 40
75	50.12	1 006.7	2.009 97	0.843 83	0.992 81	42.10	1 128.3	6.082 80	0.667 04	0.971 95
	49.95	942.5	1.798 53	0.852 98	0.993 72	39.89	500.0	2.698 19	0.678 89	0.971 51
	48.83	783.2	1.203 86	0.892 46	0.996 99

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