生物质热压成型温度场分布规律

doi:10.11707/j.1001-7488.20200417

Abstract

Abstract:

Objective: The aim of this study was to study the distribution of the temperature field of the section of the molding block during the biomass hot compression molding,which was expected to provide a reference for the study of biomass hot forming technology. Method: This paper took the single plunger biomass molding machine independently developed by the School of Technology of Beijing Forestry University as the experimental equipment,and adopted the heating method of forming sleeve to study the waste pine sawdust used as the experimental materials. The orthogonal test was designed with heating temperature,raw material moisture content and motor frequency as experimental factors. The heating temperature was set as 155,170,185,200 and 215℃,the sawdust moisture content was adjusted to 10%,12%,14%,16% and 18%,and the motor frequency was set as 14,16,18,20 and 22 Hz,respectively. Using the variance analysis method to analyze the overall density of the molding block,the average temperature,the highest temperature and the center point temperature of the molding block section were affected by the experimental temperature,moisture content,and motor frequency. Experimental results showed that by establishing a multivariate regression model,the multiple regression equations could be obtained with the overall density of the molding block,the average temperature,the highest temperature,and the center point temperature of the molding block section as the dependent variables,with the experimental temperature,moisture content,and motor frequency as independent variables,and get a simplified multiple regression equation. Through the establishment of multiple regression models and comparative analysis,the best mathematical model relationships between the overall density of the forming block and the temperature field distribution of the biomass forming block were expected to be found. Result: For the center point temperature,the primary and secondary influencing factors are moisture content,motor frequency and temperature; for the average temperature,the primary influencing factors are temperature and moisture content,the secondary influencing factor is motor frequency; and for the highest temperature,the primary and secondary influencing factors are temperature,motor frequency and moisture content. Our results demonstrated that the error of each simplified multiple regression equation and the original multiple regression equation is less than 1.5%. The best multiple regression model and equations are obtained with the overall density of the biomass molding block as the dependent variable,and the average temperature,the highest temperature,and the center point temperature of the molding block section as the independent variables. Conclusion: In practical applications of biomass hot forming,the distribution of the temperature field of the section of the molding block has a profound effect on the quality of biomass molding. This paper explores the distribution of temperature field in biomass hot forming in actual experiments. Through analysis and modeling,it is found that there is a mathematical relationship between the overall density of the forming block and the distribution of the temperature field of the section of the molding block,which might broaden our ideas for subsequent biomass research.

Key words: biomass solid fuel, hot press forming, distribution of temperature field

CLC Number:

TK6
S216.21

Jinming Wang,Xiangyue Yuan,Zhongjia Chen,Yuwei Zhang,Yanming Wang. Distribution of Temperature Field in Biomass Hot Forming[J]. Scientia Silvae Sinicae, 2020, 56(4): 150-159.

Figures/Tables 15

Table 1

Fig.1

Fig.2

Fig.3

Table 2

Table 3

Table 4

Table 5

Table 6

Fig.4

Fig.5

Fig.6

Fig.7

Table 7

Table 8

References 0

	陈正宇. 2013.生物质成型工艺参数研究.北京:北京机电研究所硕士学位论文.
	Chen Z Y. 2013. Technology parameters study of biomass compression molding. Beijing: MS thesis of Beijing Mechanical and Electrical Research Institute.[in Chinese]
	杜红光, 董玉平, 王慧, 等. 生物质冷压成型模具摩擦热分析. 农业工程学报, 2011. 27 (9): 58- 62. doi: 10.3969/j.issn.1002-6819.2011.09.012
	Du H G , Dong Y P , Wang H , et al. Analysis of friction heat formed in biomass cold briquetting mold. Transactions of the Chinese Society of Agricultural Engineering, 2011. 27 (9): 58- 62. doi: 10.3969/j.issn.1002-6819.2011.09.012
	高名旺, 董玉平. 生物质热压成型温度场数值模拟. 可再生能源, 2004. 22 (2): 23- 25. doi: 10.3969/j.issn.1671-5292.2004.02.007
	Gao M W , Dong Y P . Numerical simulation of temperature field of biomass thermal compression. Renewable Energy, 2004. 22 (2): 23- 25. doi: 10.3969/j.issn.1671-5292.2004.02.007
	回彩娟. 2006.生物质燃料常温高压致密成型技术及成型机理研究.北京:北京林业大学硕士学位论文.
	Hui C J. 2006. The studies of biomass solidifying technology and principle with high pressure on natural conditions for bio-fuel making. Beijing: MS thesis of Beijing Forestry University[in Chinese]
	侯官星. 2016.生物质燃料颗粒挤压成型的影响因素分析与模拟.天津:天津科技大学硕士学位论文.
	Hou G X. 2016. Study on influence factions of the extrusion molding of fuel pellets from biomass and its simulation. Tianjin: MS thesis of Tianjin University of Science and Technology[in Chinese]
	胡建军, 雷廷宙, 何晓峰, 等. 小麦秸秆颗粒燃料冷态压缩成型参数试验研究. 太阳能学报, 2008. 29 (2): 241- 245. doi: 10.3321/j.issn:0254-0096.2008.02.021
	Hu J J , Lei T Z , He X F , et al. Experimental research on the compressing molding parameter cold conditions for wheat straw pellet fuel. Acta Energiae Solaris Sinica, 2008. 29 (2): 241- 245. doi: 10.3321/j.issn:0254-0096.2008.02.021
	姜洋, 曲静霞, 郭军, 等. 生物质颗粒燃料成型条件的研究. 可再生能源, 2006. 24 (5): 16- 18. doi: 10.3969/j.issn.1671-5292.2006.05.006
	Jiang Y , Qu J X , Guo J , et al. Study on the formation conditions of biomass pellet. Renewable Energy, 2006. 24 (5): 16- 18. doi: 10.3969/j.issn.1671-5292.2006.05.006
	景元琢, 董玉平, 盖超, 等. 生物质固化成型技术研究进展与展望. 中国工程科学, 2011. 13 (2): 72- 77. doi: 10.3969/j.issn.1009-1742.2011.02.013
	Jing Y Z , Dong Y P , Gai C , et al. Research development and prospects of biomass briquetting technology. China Engineering Science, 2011. 13 (2): 72- 77. doi: 10.3969/j.issn.1009-1742.2011.02.013
	卢彪. 2016.生物质成型装置及最优成型工艺参数研究.哈尔滨:哈尔滨工业大学硕士学位论文.
	Lu B. 2016. Research on Biomass briquetting device and optimum technologic parameters of densification. Harbin: MS thesis of Harbin Institute of Technology.[in Chinese]
	李大中, 朱文杰. 生物质稻壳圧缩成型过程建模及优化. 可再生能源, 2010. 28 (5): 124- 131. doi: 10.3969/j.issn.1671-5292.2010.05.031
	Li D Z , Zhu W J . Modeling and optimization in the briquetting process of rice husk. Renewable Energy, 2010. 28 (5): 124- 131. doi: 10.3969/j.issn.1671-5292.2010.05.031
	刘希锋. 2014.秸秆固化成型机的设计与试验.长春:吉林大学硕士学位论文.
	Liu X F. 2014. The design and experiment of straw curing machine. Changchun: MS thesis of Jilin University.[in Chinese]
	李玉迪, 许宏光, 荆成虎. 闭式生物质热压成型传热模拟. 哈尔滨工业大学学报, 2018. 50 (7): 30- 37.
	Li Y D , Xu H G , Jing C H . Simulation of heat transfer model of closed biomassthermo-compression formation. Journal of Harbin Institute of Technology, 2018. 50 (7): 30- 37.
	李震, 俞国胜, 陈忠加, 等. 齿辊式环模生物质成型机设计与试验. 农业机械学报, 2015. 46 (5): 220- 225.
	Li Z , Yu G S , Chen Z J , et al. Development and experiment of gear rolls biomass forming machine. Transactions of the Chinese Society for Agricultural Machinery, 2015. 46 (5): 220- 225.
	齐天, 王志伟, 雷廷宙, 等. 农林废弃物冷压成型过程热特性分析. 河南科学, 2017. 35 (1): 101- 104.
	Qi T , Wang Z W , Lei T Z , et al. Analysis on briquette thermal characteristics of agricultural and forestry residues. Henan Science, 2017. 35 (1): 101- 104.
	孙亮, 孙清, 接鑫, 等. 稻壳热压成型工艺参数试验. 农业机械学报, 2010. 41 (1): 96- 100. doi: 10.3969/j.issn.1000-1298.2010.01.019
	Sun L , Sun Q , Jie X , et al. Main technological parameters of rice hull hot briquetting. Transactions of the Chinese Society for Agricultural Machinery, 2010. 41 (1): 96- 100. doi: 10.3969/j.issn.1000-1298.2010.01.019
	涂德浴, 李安心, 何贵生. 水稻秸秆与木屑混合原料热压成型试验. 农业工程学报, 2015. 31 (20): 205- 211. doi: 10.11975/j.issn.1002-6819.2015.20.029
	Tu D Y , Li A X , He G S . Hot pressing forming experiment of the rice straw and sawdust mixed material. Transactions of the Chinese Society of Agricultural Engineering, 2015. 31 (20): 205- 211. doi: 10.11975/j.issn.1002-6819.2015.20.029
	王青宇. 2016.新型柱塞式平模生物质成型机设计及成型影响因素试验.北京:北京林业大学硕士学位论文.
	Wang Q Y. 2016. Design and modeling test of new flat die pelleting mill with plunger. Beijing: MS thesis of Beijing Forestry University.[in Chinese]
	王雪皓, 陈忠加, 俞国胜, 等. 套筒加热方式对锯屑致密成型的影响. 林业科学, 2018. 54 (2): 145- 152. doi: 10.3969/j.issn.1006-1126.2018.02.005
	Wang X H , Chen Z J , Yu G S , et al. Influence of die heating method on sawdust densification. Scientia Silvae Sinicae, 2018. 54 (2): 145- 152. doi: 10.3969/j.issn.1006-1126.2018.02.005
	王艳明. 2019.单柱塞式生物质成型机的研制与致密成型实验.北京:北京林业大学硕士学位论文.
	Wang Y M. 2019. The research and design of single plunger biomass forming machine. Beijing: MS thesis of Beijing Forestry University.[in Chinese]
	邢献军, 李涛, 马培勇, 等. 生物质固体成型燃料热压成型实验研究. 太阳能学报, 2016. 39 (10): 2660- 2667. doi: 10.3969/j.issn.0254-0096.2016.10.031
	Xing X J , Li T , Ma P Y , et al. Experimental study of hot molding of densified biofuel. Acta Energiae Solaris Sinica, 2016. 39 (10): 2660- 2667. doi: 10.3969/j.issn.0254-0096.2016.10.031
	张霞, 蔡宗寿, 陈丽红, 等. 生物质成型燃料致密成型机理及品质评价指标. 可再生能源, 2014. 32 (12): 1917- 1921.
	Zhang X , Cai Z S , Chen L H , et al. Research on compressing mechanism and quality evaluation parameters of densified biomass fuel. Renewable Energy, 2014. 32 (12): 1917- 1921.
	Obernberger I , Thek G . Physical characterisation and chemical composition of densified biomass fuels with regard to their combustion behavior. Transactions of the Chinese Society of Agricultural Engineering, 2004. 27 (6): 653- 669.
	Mewes E . Measurement of forces on straw balers. Grundl Landtech, 1958. 8 (10): 18- 35.
	Wang Y M , Chen Z J , Yuan X Y . Influence of temperature and moisture content on the densification of bamboo powder using die heating method. Wood Research, 2018. 63 (4): 655- 668.

粒径Particle size/mm	＞3.15	2~3.15	1~2	0.5~1	0.5~0.25	0.25~0.1	0~0.1
百分比Percentage(%)	7.78	7.18	4.50	13.90	23.85	25.13	17.66

因素 Factor	整体密度 Overall density	平均温度 Average temperature	最高温度 The highest temperature	中心点温度 Center point temperature
因素A Factor A	0.740	＜0.001	＜0.001	0.885
因素B Factor B	0.010	＜0.001	0.626	＜0.001
因素C Factor C	0.125	0.260	0.234	0.362

因素A Factor A/℃	整体密度 Overall density/(g·cm^-3)	平均温度 Average temperature/℃	最高温度 The highest temperature/℃	中心点温度 Center point temperature/℃
155	1.138 5	85.35	112.70	78.58
185	1.133 4	94.82	133.56	81.62
215	1.064 8	103.20	149.94	80.60
170	1.147 8	89.38	124.60	81.26
200	1.082 6	98.76	144.38	81.18

因素B Factor B(%)	整体密度 Overall density/(g·cm^-3)	平均温度 Average temperature/℃	最高温度 The highest temperature/℃	中心点温度 Center point temperature/℃
0.10	1.197 3	102.5	137.98	88.13
0.12	1.171 6	95.46	132.84	82.26
0.14	1.167 8	94.32	136.40	80.42
0.16	1.038 6	91.78	128.08	78.44
0.18	1.003 6	90.88	130.18	75.90

因素C Factor C/Hz	整体密度 Overall density/(g·cm^-3)	平均温度 Average temperature/℃	最高温度 The highest temperature/℃	中心点温度 Center point temperature/℃
14	1.123 3	96.70	137.56	79.58
16	1.097 4	95.62	135.40	81.44
18	1.067 0	92.86	130.86	80.62
20	1.124 0	97.26	137.80	81.88
22	1.139 5	93.88	133.30	80.00

Distribution of Temperature Field in Biomass Hot Forming

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 15

References 0

Related Articles 4

Recommended Articles

Metrics

Comments

水平 Level	温度 Temperature/℃	含水率 Moisture content(%)	电机频率 Motor frequency/Hz
1	155	10	14
2	185	12	16
3	215	14	18
4	170	16	20
5	200	18	22

因变量 Dependent variable	R₁²	多元回归拟合模型 Multiple regression fitting model
整体密度 Overall density	0.788 6	y₁=-0.000 002 4A²-0.001 1A-15.078 1B²+1.322 1B+0.005 1C²-0.177 9C+3.039 8
平均温度 Average temperature	0.957 1	y₂=0.288 5A+1 040.768 0B²-400.757 0B+0.072 3C²-3.038 1C+106.673 2
最高温度 The highest temperature	0.896 6	y₃=-0.004 4A²+2.278 9A-2 738.990 0B²+754.808 3B+0.016 1C²-1.742 6C-159.880
中心点温度 Center point temperature	0.871 3	y₄=-0.001 2A²+0.453 5A+1 104.613 0B²- 449.021 0B-0.044 2C²+1.800 8C+61.883 2

因变量 Dependent variable	R₂²	δ(%)	简化模型的多元回归拟合模型 Simplified model’s multiple regression fitting model
整体密度 Overall density	0.7885	0.0091	y₁=0.002 0A-14.952 8B²+1.283 5B+0.005 1C²-0.178 3C+3.126 7
平均温度 Average temperature	0.957 1	0.000 0	y₂=0.288 5A+1 040.768 0B²-400.757 0B+0.072 3C²-3.038 1C+106.673 2
最高温度 The highest temperature	0.883 8	1.427 5	y₃=0.640 1A-2 505.190 0B²+682.798 1B+0.039 5C²-2.518 8C-2.194 2
中心点温度 Center point temperature	0.860 3	1.254 7	y₄=0.000 8A+1 169.205 0B²-468.915 0B-0.037 7C²+1.586 4C+106.659 3

[1]	Jiewang Ye,Jianchun Jiang,Weidi Dai,Zhenfu Jin,Xiaochun Zhang. Catalytic Liquefaction of Bamboo by Cu-Ni Doped Porous Metal Oxide [J]. Scientia Silvae Sinicae, 2020, 56(4): 143-149.
[2]	Deng Congjing, Ma Huanhuan, Wang Liangcai, Zhu Zhengxiang, Zhou Jianbin. Structure Characterization and Pyrolysis Properties of Apricot Shell Hemicellulose [J]. Scientia Silvae Sinicae, 2019, 55(1): 74-80.
[3]	Wang Xuehao, Chen Zhongjia, Yu Guosheng, Yuan Xiangyue, Pang Minghong. Influence of Die Heating Method on Sawdust Densification [J]. Scientia Silvae Sinicae, 2018, 54(2): 145-152.
[4]	Jiang Xinyuan, Liao Yuanyuan, Guo Zhong, Meng An, Huang Zecai, Yang Suwen. Pyrolysis Characteristics and Correlation Analysis with the Major Components of Seven Kinds of Nutshell [J]. Scientia Silvae Sinicae, 2015, 51(12): 79-86.