折流内构件移动床中煤在不同停留时间下的热解行为特性

周琦; 张旭; 王岩; 曲思建; 张飏; 白效言; 裴贤丰

doi:10.1016/S1872-5813(21)60043-9

折流内构件移动床中煤在不同停留时间下的热解行为特性

doi: 10.1016/S1872-5813(21)60043-9

周琦^{1, 2, 3, ,},
张旭^{1, 2, 3},
王岩^{1, 2, 3, 4},
曲思建^{1, 2, 3},
张飏^{1, 2, 3},
白效言^{1, 2, 3, 4},
裴贤丰^{1, 2, 3}

1.
煤炭科学技术研究院有限公司煤化工分院，北京，100013
2.
煤炭资源高效开采与洁净利用国家重点实验室，北京 100013
3.
国家能源煤炭高效利用与节能减排技术装备重点实验室，北京 100013
4.
煤炭科学研究总院，北京 100013

基金项目: 国家重点研发计划项目（2016YFB0600304）资助

详细信息

通讯作者:
Tel: 010-84262976, E-mail: zhouqi0419@163.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: 2021-01-06
- 修回日期: 2021-02-04
- 网络出版日期: 2021-03-30
- 刊出日期: 2021-05-28

Pyrolysis behavior of coal in a moving bed with baffled internals under different residence times

ZHOU Qi^{1, 2, 3
, ,},
ZHANG Xu^{1, 2, 3},
WANG Yan^{1, 2, 3, 4},
QU Si-jian^{1, 2, 3},
ZHANG Yang^{1, 2, 3},
BAI Xiao-yan^{1, 2, 3, 4},
PEI Xian-feng^{1, 2, 3}

1.
Beijing Research Institute of Coal Chemistry, China Coal Research Institute, Beijing 100013, China
2.
State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, China
3.
National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control, Beijing 100013, China
4.
China Coal Research Institute, Beijing 100013, China

Funds: The project was supported by the National Key Research and Development Program of China (2016YFB0600304)

摘要

摘要: 针对常规移动床煤热解工艺所面临的无法处理粉煤，轻质焦油产率低、焦油品质差等问题，开发了折流内构件移动床热解工艺来调控气固两相的热质传递和热解反应过程。利用多段集气系统可及时地收集煤在不同热解阶段释放出的油气产物，研究了淖毛湖煤在不同温度和停留时间下的热解行为特性和产物品质。结果表明，折流内构件强化了颗粒间的热量和挥发分物质的传递，使其可处理0.4−6.0 mm的粉煤；在热解温度550 ℃，停留时间为3.0 h时，热解焦油产率达到最高为11.38%（占格金焦油产率的86.87%，质量分数），焦油馏分中低于360 ℃的轻质组分质量分数为85.0%；随着停留时间的延长，热解气中的H₂体积分数从22.1%增加到了35.1%，CO体积分数从8.0%增加到了9.5%；在第一和第二层反应器中的焦油产率随停留时间的延长而增加，在第三和第四层反应器内当停留时间为2.0 h时焦油产率最大；随着床层数的增加，焦油模拟蒸馏馏分中的轻质组分含量增加，焦油脂肪烃化合物含量减小，而单环芳烃和二环芳烃的含量逐渐增加。
- 移动床 /
- 折流内构件 /
- 热解 /
- 停留时间 /
- 焦油品质
Abstract: In view of the problems faced by the conventional moving bed coal pyrolysis process, such as the inability to deal with pulverized coal, low light tar yield, poor tar quality, etc., a moving bed pyrolysis process with baffled internals was developed to control the heat and mass transfer of the gas-solid two-phase and the pyrolysis reaction process. The multi-stage gas gathering system can collect the oil and gas products released in different pyrolysis stages of coal in time. The pyrolysis behavior and product quality of Naomaohu coal at different temperatures and residence times were investigated. The results show that the baffle internals enhance the heat and volatile matter transfer between particles, enabling it to process 0.4−6.0 mm pulverized coal. When the pyrolysis temperature is 550 ℃ and the residence time is 3 h, the pyrolysis tar yield reaches the highest 11.38%, which is 86.87% of the Gray-King assay yield, and the mass fraction of light components below 360 ℃ in the tar fraction is 85.0%. With the extension of the residence time, the H₂ volume fraction in the pyrolysis gas increases from 22.1% to 35.1%, and the CO volume fraction increases from 8.0% to 9.5%. The tar yield in the first and second layer reactors increases with the extension of the residence time, and the maximum tar yield in the third and fourth layer reactors is obtained when the residence time is 2 h. As the number of beds increases, the content of light components in the tar simulated distillation fraction increases, the content of tar aliphatic hydrocarbon compounds decreases, and the content of monocyclic aromatic hydrocarbons and bicyclic aromatic hydrocarbons gradually increases. Based on the above research, it provides technical support for large-scale industrial processing of small particle size pulverized coal, and preparation of higher yield and quality tar.
- moving bed /
- baffled internals /
- pyrolysis /
- residence time /
- tar quality

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FIG. 662. FIG. 662.

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图 1 折流移动床热解工艺流程示意图

Figure 1 A schematic diagram of experimental system

1: Coal hopper; 2: Moving bed with baffled internals; 3: Electric furnaces; 4: Baffled internals; 5: Char condenser; 6: Screw discharger; 7: Char receiver; 8: Gas collector; 9: Gas buffer tank; 10: Multi-stage gas condenser; 11: Tar receiver; 12: Solvent absorption system; 13: Wet gas flow meter; 14: Gas bag

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图 2 折流内构件和多段集气系统协同调控示意图

Figure 2 Schematic diagram of coordinated control of baffle internals and multi-stage gas gathering system

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图 3 焦油产率随着热解温度的变化

Figure 3 Variation of tar yield with pyrolysis temperature

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图 4 热解产物产率随着停留时间的变化

Figure 4 Change of pyrolysis product yield with residence times

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图 5 不同颗粒停留时间下气体组成

Figure 5 Gas composition under different particle residence times

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图 6 不同停留时间下各床层焦油产率及温度分布

Figure 6 Tar yield and temperature distribution of each bed under different residence times

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图 7 不同停留时间下煤热解焦油模拟蒸馏馏分组成

Figure 7 Fraction composition of simulated distillation of coal pyrolysis tars under different residence times

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图 8 淖毛湖煤壳质组特征显微组分（油浸，反射荧光，500倍）

Figure 8 Characteristic microscopic components of the exinite of Naomaohu coal (oil immersion, reflection fluorescent, 500 times)

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图 9 煤热解过程中不同时间段所得焦油模拟蒸馏馏分组成

Figure 9 Fraction composition of simulated distillation fractions of tars obtained in different time periods during coal pyrolysis

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图 10 不同停留时间下煤热解焦油GC-MS表征

Figure 10 GC-MS analysis of tars from coal pyrolysis under different residence times

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表 1 淖毛湖煤的工业分析及元素分析

Table 1 Proximate and ultimate analyses of NMH coal

Proximate analysis /%				Ultimate analysis /%（daf）					Gray-King /%
M_ad	A_d	V_daf	FC_daf	C	H	N	S	O*	tar(ad)
17.7	7.8	50.9	49.1	73.9	5.5	1.0	0.5	19.1	13.1
*：by difference

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表 2 从GC-MS分析结果得到的各停留时间下所得焦油组分含量

Table 2 Tar composition content of different residence time obtained from GC-MS analysis results

Residence time/h	Bed number	AHs/%	MAHs/%	PC/%	PAHs/%
2.0	1	48.44	17.35	23.15	8.72
	2	38.65	18.99	26.49	13.68
	3	35.69	22.84	24.16	14.12
	4	32.39	24.01	13.61	17.55
2.5	1	48.89	21.70	20.06	6.55
	2	38.63	23.07	22.37	12.33
	3	32.60	19.01	27.01	18.06
	4	28.26	31.54	17.16	19.44
3.0	1	44.92	21.98	22.00	9.32
	2	37.54	24.12	24.20	13.17
	3	28.30	25.76	19.78	18.24
	4	25.12	33.28	14.89	19.33

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