生物质热解碳烟的研究进展

doi:10.16085/j.issn.1000-6613.2020-2208

化工进展 ›› 2021, Vol. 40 ›› Issue (10): 5772-5785.DOI: 10.16085/j.issn.1000-6613.2020-2208

生物质热解碳烟的研究进展

蒋好¹(), 朱有健¹^,²(), 邵敬爱¹^,³, 成伟¹, 吴贵豪¹, 杨海平¹, 陈汉平¹^,³

^1.华中科技大学能源与动力工程学院煤燃烧国家重点实验室，湖北武汉 430074
^2.郑州轻工业大学能源与动力工程学院，河南郑州 450002
^3.华中科技大学能源与动力工程学院新能源科学与工程系，湖北武汉 430074

收稿日期:2020-11-05 修回日期:2020-12-22 出版日期:2021-10-10 发布日期:2021-10-25
通讯作者: 朱有健
作者简介:蒋好（1994—），男，硕士研究生，研究方向为生物质和含碳固废热解。E-mail：jiang_hao@hust.edu.cn。
基金资助:
国家自然科学基金(51706210)

Review on soot formation during biomass pyrolysis

JIANG Hao¹(), ZHU Youjian¹^,²(), SHAO Jing’ai¹^,³, CHENG Wei¹, WU Guihao¹, YANG Haiping¹, CHEN Hanping¹^,³

^1.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China
^2.School of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China
^3.Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China

Received:2020-11-05 Revised:2020-12-22 Online:2021-10-10 Published:2021-10-25
Contact: ZHU Youjian

摘要/Abstract

摘要：

碳烟是燃料不完全燃烧或气化形成的纳米级碳质颗粒，是空气中细颗粒物PM_2.5的主要来源之一，也是仅次于CO₂的温室效应主要贡献源之一。碳烟的生成会降低生物质热转化过程中的能量利用效率以及气化过程中合成气的品质。作为生物质热化学转化过程的初始步骤，热解碳烟的生成特性、形成机理和减排方法对转化过程中碳烟的控制具有指导意义。本文从生物质热解碳烟的取样、排放特性、理化性质、生成机理及减排措施等方面进行了综述。着重介绍了热解碳烟的产率、化学组成、微观样貌、内部结构和反应性等，总结了原料特性及热解工况对碳烟产率和反应性的影响，汇总了当前调控热解碳烟排放的主要措施。指出目前针对生物质热解碳烟前体的形成及演化转变机理仍不明确，热解碳烟的氧化反应机理研究鲜有报道。此外，热解碳烟生成受原料类型和热解工况等诸多因素影响，当前研究多为单因素的影响分析，缺乏针对碳烟排放的多因素耦合优化研究。

关键词: 生物质, 热解, 碳烟, 生成机理, 减排

Abstract:

Soot, a type of solid carbonaceous nanoparticles, is the main components in PM_2.5, and it is also the important contributor to global warming due to its high radiation. The generation of soot will reduce the energy utilization efficiency due to lower carbon conversion rate during biomass thermal chemical conversion process, and it can also downgrade the quality and yield of syngas during biomass gasification. Pyrolysis is the initial process during biomass thermal chemical conversion process. The characteristics, formation mechanism and emission reduction methods of soot during biomass pyrolysis are significant for the control of soot during thermal chemical conversion process. This study summarizes the research progress of biomass pyrolysis soot from the respects of sampling, emission, characteristics analysis, formation mechanism and reduction methods, mainly discusses soot yield, chemical composition, micro-morphologies, internal structure and reactivity, and summarizes the effects of feedstock characteristics and pyrolysis conditions on soot yield and reactivity. Measures to achieve soot control are also summarized. The current studies were carried out through the analyze of final soot particles. The evolutionary transformation mechanism of soot precursors, soot oxidation and elimination during biomass pyrolysis are still unclear. In addition, the formation of soot during pyrolysis is affected by feedstock and pyrolysis conditions, but current studies mostly focused on the impact analysis of a single factor. The multi-factor optimization analysis on soot formation needs to be strengthened.

Key words: biomass, pyrolysis, soot, formation mechanism, soot reduction

中图分类号:

蒋好, 朱有健, 邵敬爱, 成伟, 吴贵豪, 杨海平, 陈汉平. 生物质热解碳烟的研究进展[J]. 化工进展, 2021, 40(10): 5772-5785.

JIANG Hao, ZHU Youjian, SHAO Jing’ai, CHENG Wei, WU Guihao, YANG Haiping, CHEN Hanping. Review on soot formation during biomass pyrolysis[J]. Chemical Industry and Engineering Progress, 2021, 40(10): 5772-5785.

图/表 15

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取样装置	取样原理	浓度监测	粒径监测	实时	优点	缺点
夹套式过滤器^［15-16］	滤膜截留采样	重量法计算质量浓度	显微镜与图像软件估计	否	取样简单，样品可进行化学分析	称重受天平精度影响，显微镜图像识别粒径代表性不够强
夹套式过滤器^［15-16］		重量法计算质量浓度	激光粒度仪（光衍射法）测量体积粒径分布	否	自动化程度高，测试范围广
低压冲击器（LPI）^［18-19］	冲击法采样	重量法计算质量浓度	级联冲击法对粒径分级（30～10000nm）	否	按粒径分级取样，尺寸范围大	称重受天平精度影响，极小颗粒不易分级，收集样品有限
稀释取样-粒子迁移率光谱仪分析系统 ^［20］	利用微孔探针稀释采样连接光学仪器分析	冷凝计数器检测数量浓度	差分迁移率筛分仪分析粒径（3～1000nm）	是	实时测量，适用小颗粒	不能直接收集样品进行分析

取样装置	取样原理	浓度监测	粒径监测	实时	优点	缺点
夹套式过滤器^［15-16］	滤膜截留采样	重量法计算质量浓度	显微镜与图像软件估计	否	取样简单，样品可进行化学分析	称重受天平精度影响，显微镜图像识别粒径代表性不够强
夹套式过滤器^［15-16］		重量法计算质量浓度	激光粒度仪（光衍射法）测量体积粒径分布	否	自动化程度高，测试范围广
低压冲击器（LPI）^［18-19］	冲击法采样	重量法计算质量浓度	级联冲击法对粒径分级（30～10000nm）	否	按粒径分级取样，尺寸范围大	称重受天平精度影响，极小颗粒不易分级，收集样品有限
稀释取样-粒子迁移率光谱仪分析系统 ^［20］	利用微孔探针稀释采样连接光学仪器分析	冷凝计数器检测数量浓度	差分迁移率筛分仪分析粒径（3～1000nm）	是	实时测量，适用小颗粒	不能直接收集样品进行分析

原料	热解温度/℃	反应器	停留时间/s	碳烟产率/%
松木^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	3.3/8.36/6.97
山毛榉^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	3.0/5.89/5.81
山毛榉^［17］②	800/1000/1200/1400	滴管炉	4.3	0/0/17/16.8
山毛榉^［17］②	800/1000/1200/1400	滴管炉	4.3	0/0/16.4/16.6
山毛榉^［22］②	1400	滴管炉	2.6	8.55
木屑^［23］	800/1000/1200	滴管炉	—	0.1/0.5/2.7
杨木屑^［24］②	900/1000/1100/1200/1300	滴管炉	2~4	0.3/1.3/2.7/5.2/6.3
木屑^［25］	1100/1250	固定床	2	4.52/7.39
麦秸^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	2.0/2.66/3.53
麦秆^［23］	1000/1200	滴管炉	—	0.2/2.2
稻秆^［23］	1000/1200	滴管炉	—	0.2/2.25
麦秆^［24］②	900/1000/1100/1200/1300	滴管炉	2~4	0.3/0.5/1.3/2.0/2.4
麦秆^［26］	900～1200	固定床	0.2	无碳烟生成
麦秆^{［25， 27］}	1000/1100/1200/1250	固定床	2	0.47/3.34/5.95/6.21
水洗麦秆^［27］	1000/1100/1200	固定床	2	0.37/3.78/6.23
苜蓿秸秆^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	2.8/5.1/4.4
纤维素^［28］	1250	滴管炉	1^①	<1
半纤维素^［28］	1250	滴管炉	1^①	<1
麦秆提取木质素^［28］	1250	滴管炉	1^①	13
软木提取木质素^［28］	1250	滴管炉	1^①	9.8
纤维素^［18］	1300	滴管炉	1.3	1.16
木聚糖^［18］	1300	滴管炉	1.3	0.7
木质素^［18］	1300	滴管炉	1.3	10.07

原料	热解温度/℃	反应器	停留时间/s	碳烟产率/%
松木^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	3.3/8.36/6.97
山毛榉^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	3.0/5.89/5.81
山毛榉^［17］②	800/1000/1200/1400	滴管炉	4.3	0/0/17/16.8
山毛榉^［17］②	800/1000/1200/1400	滴管炉	4.3	0/0/16.4/16.6
山毛榉^［22］②	1400	滴管炉	2.6	8.55
木屑^［23］	800/1000/1200	滴管炉	—	0.1/0.5/2.7
杨木屑^［24］②	900/1000/1100/1200/1300	滴管炉	2~4	0.3/1.3/2.7/5.2/6.3
木屑^［25］	1100/1250	固定床	2	4.52/7.39
麦秸^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	2.0/2.66/3.53
麦秆^［23］	1000/1200	滴管炉	—	0.2/2.2
稻秆^［23］	1000/1200	滴管炉	—	0.2/2.25
麦秆^［24］②	900/1000/1100/1200/1300	滴管炉	2~4	0.3/0.5/1.3/2.0/2.4
麦秆^［26］	900～1200	固定床	0.2	无碳烟生成
麦秆^{［25， 27］}	1000/1100/1200/1250	固定床	2	0.47/3.34/5.95/6.21
水洗麦秆^［27］	1000/1100/1200	固定床	2	0.37/3.78/6.23
苜蓿秸秆^{［15， 21］②}	1000/1250/1400	滴管炉	1^①	2.8/5.1/4.4
纤维素^［28］	1250	滴管炉	1^①	<1
半纤维素^［28］	1250	滴管炉	1^①	<1
麦秆提取木质素^［28］	1250	滴管炉	1^①	13
软木提取木质素^［28］	1250	滴管炉	1^①	9.8
纤维素^［18］	1300	滴管炉	1.3	1.16
木聚糖^［18］	1300	滴管炉	1.3	0.7
木质素^［18］	1300	滴管炉	1.3	10.07

源	Ⅲ类平方和	自由度	均方	F	显著性
修正模型	804.200	14	57.443	56.774	0.000
截距	505.266	1	505.266	499.386	0.000
原料类型	22.117	1	22.117	21.860	0.000
停留时间	104.945	2	52.473	51.862	0.000
热解温度	488.875	7	69.839	69.026	0.000
原料类型 * 停留时间	0.087	1	0.087	0.086	0.773
停留时间 * 热解温度	187.697	3	62.566	61.838	0.000
误差	16.188	16	1.012
总计	1559.937	31
修正后总计	820.388	30

生物质热解碳烟的研究进展

Review on soot formation during biomass pyrolysis

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原料	热解温度 /℃	无机物种总质量分数 /%	各元素质量分数/%
原料	热解温度 /℃	无机物种总质量分数 /%	Na	K	Cl	S	Si	Ca
松木^{［15， 19］}	1250	0	—	—	—	—	—	—
	1300	约0.2	0.075	0.1	0.037	—	—	—
	1400	0	—	—	—	—	—	—
山毛榉^［15］	1250	0.51	—	约0.3	—	—	—	—
	1400	1.2	—	—	—	—	—	—
麦秆^［15］	1250	2.26	—	—	—	—	—	—
	1400	12.18	0.47	1.6	0.53	0.8	1.11	0.28
苜蓿秆^［21］	1250	17	—	—	—	—	—	—
	1400	21	0.7	7	4	0.8	0.36	0.57
纤维素^［18］	1300	<0.43	—	—	—	—	—	—
木聚糖^［18］	1300	1.55	0.97	0.24	0.07	0.27	—	—
木质素^［18］	1300	0.43	0.22	0.15	0.03	0.02	—	—

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