高温气体渗流热解印刷线路板传热特性的实验研究
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摘要
本文自行设计固定床热解实验装置,对3种不同尺寸废弃印刷线路板颗粒料层热解过程中温度分布进行了对比实验,重点研究废弃印刷线路板在固定床中高温热气体渗流作用下热解过程的传热特性。研究结果表明:大尺寸颗粒料层的热解区域纵向迁移速度要快于小尺寸颗粒料层,当颗粒尺寸为1.5 cm、2.5 cm、3.5 cm时,热解区域的纵向迁移速度分别为0.47 m·h~(-1)、0.50 m·h~(-1)和0.63 m·h~(-1);高温热气体渗流能够使整个料层充分热解,同一水平面中部物料颗粒都均匀地处于同一热解状态,而靠近炉膛壁面处物料的升温和热解速度要低于中部的物料。
A fixed bed pyrolysis experiment device was established and investigated experimentally under high temperature nitrogen flow. The temperature distribution of waste PCB particles layer was measured, and the heat transfer characteristics was investigated. The experimental results indicate that the size of the PCB particle has an obvious effect on the pyrolysis reaction time and the migration rate of pyrolysis. The larger the particle size is, the shorter the pyrolysis reaction time is and the faster the migration rate is. When the square particle sizes are 1.5 cm, 2.5 cm and 3.5 cm wide, the average migration rates of pyrolysis reaction zone along the vertical direction are 0.47 m/h, 0.50 m/h and0.63 m/h, respectively. High temperature gas can make the whole material layer fully pyrolyzed. The particles in the middle part of the same level are uniformly in the same pyrolysis state, while the temperature and pyrolysis speed of materials near the furnace wall are lower than those of the central part.
A fixed bed pyrolysis experiment device was established and investigated experimentally under high temperature nitrogen flow. The temperature distribution of waste PCB particles layer was measured, and the heat transfer characteristics was investigated. The experimental results indicate that the size of the PCB particle has an obvious effect on the pyrolysis reaction time and the migration rate of pyrolysis. The larger the particle size is, the shorter the pyrolysis reaction time is and the faster the migration rate is. When the square particle sizes are 1.5 cm, 2.5 cm and 3.5 cm wide, the average migration rates of pyrolysis reaction zone along the vertical direction are 0.47 m/h, 0.50 m/h and0.63 m/h, respectively. High temperature gas can make the whole material layer fully pyrolyzed. The particles in the middle part of the same level are uniformly in the same pyrolysis state, while the temperature and pyrolysis speed of materials near the furnace wall are lower than those of the central part.
引文
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[10] Hao J, Wang H, Chen S, et al. Pyrolysis Characteristics of the Mixture of Printed Circuit Board Scraps and Coal Powder[J]. Waste Management, 2014, 34(10):1763-1769
[11] Chien Y C, Wang H P, Lin K S, et al. Fate of Bromine in Pyrolysis of Printed Circuit Board Wastes[J]. Chemosphere, 2000, 40(4):383-387
[12] Wang Y, Sun S, Yang F, et al. The Effects of Activated Al_2O_3 on the Recycling of Light oil from the Catalytic Pyrolysis of Waste Printed Circuit Boards[J]. Process Safety&Environmental Protection, 2015, 98(6):276-284
[13] BlazsóM, Czegeny Z, Csoma C.. Pyrolysis and Debromination of Flame Retarded Polymers of Electronic Scrap Studied by Analytical Pyrolysis[J]. Journal of Analytical&Applied Pyrolysis, 2002, 64(2):249-261
[14] Terakado O, Ohhashi R, Hirasawa M. Bromine Fixation by Metal Oxide in Pyrolysis of Printed Circuit Board Containing Brominated Flame Retardant[J]. Journal of Analytical&Applied Pyrolysis, 2013, 103(23):216-221
[15]夏文静.废弃印刷线路板热解过程传热特性的实验研究[D].天津:天津大学环境科学与工程学院,2014XIA Wenjing. Experimental Investigation On The Heat Transfer Characteristics in Process of Printed Circuit Boards Pyrolysis[D]. Tianjin:School of Environmental Scieoce and Engineering, Tianjin University, 2014
[2] Quan C, Li A, Gao N. Thermogravimetric Analysis and Kinetic Study on Large Particles of Printed Circuit BoardWastes[J]. Waste Management, 2009, 29(8):2353-2360
[3]张于峰,郝斌,郭晓娟,等.废弃印刷线路板热重分析和动力学模型[J].燃烧科学与技术,2008, 14(6):506-510ZHANG Yufeng, HAO Bin, GUO Xiaojuan, et al. Thermogravimetric Analysis and Kinetic Models on Pyrolysis of Waste Printed Circuit Boards[J]. Journal of Combustion Science and Technology, 2008, 14(6):506-510
[4]马洪亭,王明辉,王芳超,等,典型废旧家电印刷线路板热失重特性和热解动力学模型[J].天津大学学报(自然科学与工程技术版),2011,44(7):602-606MA Hongting, WANG Minghui, WANG Fangchao, at al.Tmermograviuetric Characteristics and Kinetic Modes of Printed Circuit Boards from Typical Waste Life ElectroEquipments[J]. Journal of Tianjin University, 2011, 44(7):602-606
[5] Chiang H L, Lin K H, Lai M H, et al. Pyrolysis Characteristics of Integrated Circuit Boards at Various Particle Sizes and Temperatures[J]. Journal of Hazardous Materials, 2007, 149(1):151-159
[6] Torres A, Marco I D, Caballero B M, et al. Recycling by Pyrolysis of Thermoset Composites:Characteristics of the Liquid and Gaseous Fuels Obtained[J]. Fuel, 2000,79(8):897-902
[7] Guo Q, Yue X, Wang M, et al. Pyrolysis of Scrap Printed Circuit Board Plastic Particles in a Fluidized Bed[J].Powder Technology, 2010, 198(3):422-428
[8] Webb M, Last P M, Breen C. Synergic Chemical Analysisthe Coupling of TG with FTIR, MS and GC-MS:1. the Determination of the Gases Released During the Thermal Oxidation of a Printed Circuit Board[J]. Thermochimica Acta, 2000, 326(1/2):151-158
[9] Li J, Duan H, Yu K, et al. Characteristic of LowTemperature Pyrolysis of Printed Circuit Boards Subjected to Various Atmosphere[J]. Resources Conservation&Recycling, 2010, 54(11):810-815
[10] Hao J, Wang H, Chen S, et al. Pyrolysis Characteristics of the Mixture of Printed Circuit Board Scraps and Coal Powder[J]. Waste Management, 2014, 34(10):1763-1769
[11] Chien Y C, Wang H P, Lin K S, et al. Fate of Bromine in Pyrolysis of Printed Circuit Board Wastes[J]. Chemosphere, 2000, 40(4):383-387
[12] Wang Y, Sun S, Yang F, et al. The Effects of Activated Al_2O_3 on the Recycling of Light oil from the Catalytic Pyrolysis of Waste Printed Circuit Boards[J]. Process Safety&Environmental Protection, 2015, 98(6):276-284
[13] BlazsóM, Czegeny Z, Csoma C.. Pyrolysis and Debromination of Flame Retarded Polymers of Electronic Scrap Studied by Analytical Pyrolysis[J]. Journal of Analytical&Applied Pyrolysis, 2002, 64(2):249-261
[14] Terakado O, Ohhashi R, Hirasawa M. Bromine Fixation by Metal Oxide in Pyrolysis of Printed Circuit Board Containing Brominated Flame Retardant[J]. Journal of Analytical&Applied Pyrolysis, 2013, 103(23):216-221
[15]夏文静.废弃印刷线路板热解过程传热特性的实验研究[D].天津:天津大学环境科学与工程学院,2014XIA Wenjing. Experimental Investigation On The Heat Transfer Characteristics in Process of Printed Circuit Boards Pyrolysis[D]. Tianjin:School of Environmental Scieoce and Engineering, Tianjin University, 2014