神木煤与不同黏结煤共热解交互作用规律的研究

杨志荣; 孟庆岩; 黄戒介; 王志青; 李春玉; 房倚天

神木煤与不同黏结煤共热解交互作用规律的研究

杨志荣^{1, 2},
孟庆岩^{1, 2},
黄戒介^1, ,,
王志青¹,
李春玉¹,
房倚天¹

1.
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
2.
中国科学院大学, 北京 100049

基金项目:

国家重点研发计划项目 2016YFB 0600401-01

详细信息

中图分类号: TQ520;TQ533
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- 被引次数: 0
出版历程
- 收稿日期: 2018-03-12
- 修回日期: 2018-05-09
- 网络出版日期: 2021-01-23
- 刊出日期: 2018-06-10

Interaction between Shenmu coal and different caking coals during co-pyrolysis

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

the National Key Research and Development Program 2016YFB 0600401-01

More Information

Corresponding author: HUANG Jie-jie, E-mail: huangjj@sxicc.ac.cn

摘要

摘要: 利用程序升温热天平研究了神木煤（SMC）分别与气煤（QM）、肥煤（FM）、焦煤（JM）不同比例配合后的共热解交互作用规律，通过分布活化能模型（DAEM）对配合煤的热解动力学进行了考察。结果表明，随着SMC配入比例的增加，配合煤水分集中释放的速率增大，挥发分释放速率峰对应的温度t_max降低，配合煤在塑性固化温度后（>460-480 ℃）的热解过程中抑制作用减弱，表明配合煤黏结性降低。随着升温速率增加，配合煤热解抑制作用增强，表明配合煤黏结性提高。随着黏结煤变质程度加深（QM、FM、JM），配合煤共热解发生促进作用（促进挥发分释放）的温度分别低于、介于、高于黏结煤塑性温度区间，因此，对缓解胶质体膨胀压力及改善胶质体分散性的作用逐渐降低。通过分布热解活化能实验值与理论值的比较，证实了配煤共热解过程中的交互作用规律。
- 神木煤 /
- 黏结煤 /
- 共热解 /
- 交互作用 /
- 分布活化能
Abstract: The pyrolysis characteristic of blended coal and the interaction between Shenmu coal (SMC) and caking coals(Fat coal-FM, gas coal-QM, coking coal-JM) were studied by temperature-programmed thermobalance. The pyrolysis kinetics were analyzed using distributed activation energy model (DAEM). The results indicate that the concentrated release rate of moisture increases and temperature corresponding to the release peak of volatile matter(t_max) for coal blends decreases as increasing SMC blending ratio. The inhibition of blended coal is reduced as increasing SMC blending ratio when pyrolysis temperature surpasses the solidified temperature of metaplast (>460-480 ℃), indicating a poor bonding behavior of metaplast. In addition, the inhibition of blended coal is enhanced and its bonding behavior is improved with increasing heating rate. The effects of relieving swelling pressure and improving dispersity of metaplast gradually reduce as deepening the metamorphic degree of caking coal from QM, FM to JM, since the corresponding temperature for promoting interaction (release of volatile) is below, within, above the plastic temperature range of caking coals, respectively. A comparison of experimental and calculated distributed activation energy model confirms the interaction mechanism of blended coal during co-pyrolysis.
- Shenmu coal /
- caking coals /
- co-pyrolysis /
- interaction /
- distributed activation energy

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图 1 配合煤挥发分释放速率峰温度与神木煤配比的关系(10 ℃ /min)

Figure 1 Relationship between temperature corresponding to release peak of volatile matter (t_max) and SMC blending ratio

下载: 全尺寸图片幻灯片

图 2 神木煤与气煤、肥煤、焦煤不同配比下配煤热解实验值与计算值差值曲线(10℃ /min)

Figure 2 Difference of weight losses between experimental and calculated value for blended coal with different blending ratios

下载: 全尺寸图片幻灯片

图 3 不同煤种在热解过程中体积膨胀曲线(10 ℃/min)

Figure 3 Curves of the volume expansion ratio for various coals during pyrolysis

■: SMC; ●: QM; ▲: FM; ▼: JM

下载: 全尺寸图片幻灯片

图 4 不同配煤制得焦炭的BET比表面积对比

Figure 4 BET specific surface area of coke from blended coals with different blending ratios

: blends of SMC and QM; : blends of SMC and FM; : blends of SMC and JM

下载: 全尺寸图片幻灯片

图 5 不同升温速率下神木煤和黏结煤配煤热解实验值与计算值差值曲线

Figure 5 Difference of weight losses between experimental and calculated value for blended coal at different heating rates

(a): 40SMC:60QM; (b): 40SMC:60FM; (c): 40SMC:60JM

下载: 全尺寸图片幻灯片

图 6 SMC、JM和40SMC:60JM样品在不同煤热解转化率下的ln(β/T²)与1/T关系图

Figure 6 Relationship between ln (β/T²) and 1/T at different conversions for SMC, JM, and 40SMC:60JM

(a): SMC; (b): JM; (c): 40SMC:60JM
■: 3℃/min; ●: 10℃/min; ▲: 20℃/min

下载: 全尺寸图片幻灯片

图 7 热解活化能E_a随煤热解转化率x的变化关系及配煤热解活化能实验值与计算值差值曲线

Figure 7 Relationship between E_a and x and the difference between experimental and calculated value of E_a

(a), (b): blends of SMC and QM; (c), (d): blends of SMC and FM; (e), (f): blends of SMC and JM
■: SMC; ●: caking coal; ▲: 40SMC:60 caking coal (exp); ▼: 40SMC:60 caking coal (cal)

下载: 全尺寸图片幻灯片

表 1 原料煤样的工业分析和元素分析

Table 1 Proximate and ultimate analyses of coals

Sample	Proximate analysis w/%			Ultimate analysis w_daf/%
Sample	M_ad	A_ad	V_daf	C	H	O^*	N	S
SMC	10.52	4.40	34.02	82.98	4.70	11.10	1.02	0.20
QM	2.24	7.88	34.90	86.37	5.35	6.22	1.18	0.88
FM	0.80	20.74	32.03	87.06	5.39	2.55	1.33	3.67
JM	0.84	13.17	26.72	89.10	4.99	2.28	1.47	2.16
^*：by difference

下载: 导出CSV

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