温度对4种典型生物质成型特性的影响

doi:10.3969/j.issn.1673-5854.2019.05.005

生物质化学工程 ›› 2019, Vol. 53 ›› Issue (5): 27-33.doi: 10.3969/j.issn.1673-5854.2019.05.005

温度对4种典型生物质成型特性的影响

李伟振^1,^2,³,姜洋^1,^2,^3,*(),王微⁴,阴秀丽^1,^2,³,王明峰⁴

1. 中国科学院广州能源研究所, 广东广州 510640
2. 中国科学院可再生能源重点实验室, 广东广州 510640
3. 广东省新能源和可再生能源研究开发与应用重点实验室, 广东广州 510640
4. 华南农业大学材料与能源学院, 广东广州 510642

收稿日期:2018-07-24 出版日期:2019-09-30 发布日期:2019-09-27
通讯作者: 姜洋 E-mail:jiangyang@ms.giec.ac.cn
作者简介:李伟振(1983-),男,河南开封人,高级工程师,硕士,主要从事生物质成型技术研究
基金资助:
广州市科技计划项目(201704020189);黑龙江省省院科技合作项目(KS2018KH0090);中国科学院可再生能源重点实验室基金项目(y807j91001)

Effects of Temperature on Pelletization of Four Typical Types of Biomass

Weizhen LI^1,^2,³,Yang JIANG^1,^2,^3,*(),Wei WANG⁴,Xiuli YIN^1,^2,³,Mingfeng WANG⁴

1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
4. School of Materials and Energy, South China Agricultural University, Guangzhou 510642, China

Received:2018-07-24 Online:2019-09-30 Published:2019-09-27
Contact: Yang JIANG E-mail:jiangyang@ms.giec.ac.cn
Supported by:
广州市科技计划项目(201704020189);黑龙江省省院科技合作项目(KS2018KH0090);中国科学院可再生能源重点实验室基金项目(y807j91001)

摘要/Abstract

摘要：

以玉米秸秆、桉木屑、竹屑、硬杂木屑4种典型生物质为原料进行成型实验，研究了温度对其成型特性的影响。在差示扫描量热仪上测定了4种原料的热转变特征温度，显示玻璃态转变特征温度T_g在80~100℃之间。40℃时松弛密度（D_RS）和径向最大抗压力（M_RS）较低，成型比能耗（E_SC）较高；70~100℃时松弛密度和径向最大抗压力增大，成型比能耗降低；100~160℃时松弛密度增加，径向最大抗压力无一致性变化规律，比能耗增大；100℃左右接近4种原料玻璃态转化的终止温度，存在比能耗最低点，说明粒子达到最大软化程度，易于发生形变；原料木质素含量越高成型后颗粒的径向最大抗压力越大，成型时的比能耗越高。成型颗粒内部横断面的微观形貌测试结果显示低于原料玻璃态转变温度时，粒子间存在较大缝隙，结合不紧密；高于原料玻璃态转变温度时，粒子间缝隙较少，结合紧密。

关键词: 生物质, 温度, 成型颗粒, 松弛密度, 微观形貌

Abstract:

Four typical types of biomasses, corn stover, eucalyptus sawdust, bamboo sawdust and hardwood sawdust, were used as raw materials to analyze the effects of temperature and material chemical composition on the properties of pellets by conducting single pellet making experiments. The characteristic thermal transition temperatures of the four raw materials were measured using a differential scanning calorimetry and found the glass transition temperatures(T_g) were in the temperature range of 80-100℃. It was found that the relaxed density(D_RS) and radial maximum stress(M_RS) were lower and the specific energy consumption(E_SC) was higher at 40℃, the relaxed density and radial maximum stress increased and the specific energy consumption decreased in the temperature range of 70-100℃, the relaxed density increased and the radial maximum stress did not present consistent change law and the specific energy consumption increased in the temperature range of 100-160℃. The lowest specific energy consumption located at 100℃ during the characteristic thermal transition temperature range. Besides, the higher the raw material lignin content was, the higher the specific energy consumption and the radial maximum stress were. The micromorphology of the internal cross section of the pellets showed that there were large gaps between the particles at the temperature of lower than the onset of the glass transition temperature and there were few gaps between the particles at the temperature of higher than the endpoint of the glass transition temperature.

Key words: biomass, temperature, pellet, relaxed density, morphology

中图分类号:

TQ35
TK6

李伟振,姜洋,王微,阴秀丽,王明峰. 温度对4种典型生物质成型特性的影响[J]. 生物质化学工程, 2019, 53(5): 27-33.

Weizhen LI,Yang JIANG,Wei WANG,Xiuli YIN,Mingfeng WANG. Effects of Temperature on Pelletization of Four Typical Types of Biomass[J]. Biomass Chemical Engineering, 2019, 53(5): 27-33.

图/表 5

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参考文献 24

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原料 materials	元素分析/% ultimate analysis				工业分析/% proximate analysis				化学组分/% chemical composition				高位热值/(kJ·kg ^-1) higher heating value
原料 materials	C	H	N	S	水分 moisture content	灰分 ash content	挥发分 volatile matter	固定碳 fixed carbon	木质素 lignin	纤维素 cellulose	半纤维素 hemicelluloses	提取物 extractives	高位热值/(kJ·kg ^-1) higher heating value
玉米秸秆 corn stover	43.14	5.95	0.70	0.10	8.16	4.35	84.58	2.92	26.16	45.87	23.09	0.53	17556
桉木屑 eucalyptus sawdust	44.23	6.12	0.13	0	11.04	1.48	82.04	5.45	35.58	44.39	16.53	2.02	16964
竹屑 bamboo sawdust	44.43	6.36	0.29	0.25	7.52	2.13	80.89	9.46	35.57	36.16	18.81	7.33	20263
硬杂木屑 hardwood sawdust	48.48	6.42	0.09	0	8.47	0.56	89.19	1.79	36.26	41.40	17.61	4.17	19209

原料 materials	起始温度/℃ onset temperature	中点温度¹⁾/℃ mid-point temperature(T_g)	终止温度/℃ end point temperature	熔融温度(T_m) /℃ melting temperature
玉米秸秆corn stover	93	98	103	146
桉木屑eucalyptus sawdust	72	87	102	127
竹屑bamboo sawdust	57	80	103	124
硬杂木屑hardwood sawdust	65	84	103	104

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温度对4种典型生物质成型特性的影响

Effects of Temperature on Pelletization of Four Typical Types of Biomass

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