辐射热流下定向刨花板热解自燃试验及数值模拟

doi:10.16265/j.cnki.issn1003-3033.2022.03.019

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (3): 137-143.doi: 10.16265/j.cnki.issn1003-3033.2022.03.019

辐射热流下定向刨花板热解自燃试验及数值模拟

冯全(), 张明锐, 龚俊辉

南京工业大学安全科学与工程学院,江苏南京 211800

收稿日期:2021-12-18 修回日期:2022-02-12 出版日期:2022-08-23 发布日期:2022-09-28
作者简介:
冯全 (1995—),男,重庆人,硕士研究生,研究方向为木材、煤粉热解机制。E-mail: 201961201073@njtech.edu.cn。
龚俊辉副教授
基金资助:
国家自然科学基金资助(51974164); 江苏省研究生科研与实践创新计划项目(SJCX21_0430)

Experimental and numerical study on pyrolysis and autoignition of OSB exposed to radiant heat fluxes

FENG Quan(), ZHANG Mingrui, GONG Junhui

College of Safety Science and Engineering, Nanjing Tech University, Nanjing Jiangsu 211800, China

Received:2021-12-18 Revised:2022-02-12 Online:2022-08-23 Published:2022-09-28

摘要/Abstract

摘要：

为评估工程板材定向刨花板(OSB)在辐射热流下的自燃着火时间,首先,针对对OSB,开展毫克级的热重分析(TGA)试验,通过模型拟合法得到所建热解机制模型的动力学参数;然后,在锥形加热装置上进行7组恒定辐射热流下的克级自燃试验;其次,将改进的数值模型与测得的表面温度和质量损失率相结合,建立OSB的热力学参数反演模型,得到OSB的导热系数和比热容。最后,采用临界温度和临界质量损失速率参数预测暴露在6组恒定辐射热流下(28、30、35、40、45和50 kW/m²),着火时间分别为194、116、67、47、24、16和129、103、59、42、27、20 s。

关键词: 辐射热流, 定向刨花板(OSB), 自燃着火试验, 数值模型, 热力学参数, 着火时间

Abstract:

In order to predict autoignition time of OSB exposed to radiant heat fluxes, firstly, milligram-scale thermogravimetric analysis(TGA) tests were conducted to parameterize the established pyrolysis model by model fitting method. Subsequently, gram-scale autoignition experiments, using seven predesigned constant heat fluxes, were implemented in a cone heating apparatus. Then, inversion model of OSB thermodynamic parameters was established by combining an improved numerical model and measured surface temperatures and mass loss rates to determine thermal conductivity and specific heat of OSB. The results show that the ignition time predicted by critical temperature and critical mass loss rate are 194, 116, 67, 47, 24, 16, and 129, 103, 59, 42, 27, 20 s respectively under six constant heat flows (28, 30, 35, 40, 45 and 50 kW/m²).

Key words: radiant heat fluxes, oriented strand board (OSB), spontaneous ignition test, numerical model, thermodynamic parameter, ignition time

冯全, 张明锐, 龚俊辉. 辐射热流下定向刨花板热解自燃试验及数值模拟[J]. 中国安全科学学报, 2022, 32(3): 137-143.

FENG Quan, ZHANG Mingrui, GONG Junhui. Experimental and numerical study on pyrolysis and autoignition of OSB exposed to radiant heat fluxes[J]. China Safety Science Journal, 2022, 32(3): 137-143.

图/表 10

图1

图2

表1

表2

OSB和陶瓷纤维的热物性参数

物质/ 组分		参数	值			数据源
OSB		ρ/(g·m^-3)	5.48×10⁵			试验
		ε	0.850			文献[13]
		ΔH/(J·g^-1)	200			文献[14]
炭		k_c/(W·m^-1·K^-1)	0.08-3.93×10^-5T			文献[1]
		C_p,c/(J·g^-1·K^-1)	1.39+3.6×10^-4T			文献[1]
		ΔH_c/(J·g^-1)	-3770			文献[15]
灰分		k_a/(W·m^-1·K^-1)	0.058			文献[15]
灰分		C_p,a/(J·g^-1·K^-1)	1.244			文献[15]
物质/ 组分	参数			值	数据源
水	k_w/(W·m^-1·K^-1)			0.658	文献[16]
	$C p, w$ /(J·g^-1·K^-1)			4.200	文献[17]
	ΔH_w/(J·g^-1)			2 400	文献[18]
陶瓷纤维	k_f/(W·m^-1·K^-1)			0.060	制造商
	ρ_f/(g·m^-3)			4.0×10⁵	制造商
	C_p,f/(J·g^-1·K^-1)			0.670	制造商

表2

图3

表3

表4

图4

表5

不同热流下OSB的临界温度及临界质量损失速率

热流/ (kW·m^-2)	T_c/K	误差	$m ″ · c$ / (g·m^-2·s^-1)	误差
28	756.4	70.9	8.42	2.17
30	711.7	20.6	8.82	1.39
35	701.3	42.8	7.42	1.78
40	705. 7	12.0	7.82	0.77
45	660.7	4.9	5.35	1.22
50	647.0	18.5	4.81	1.39

表5

图5

参考文献 19

[1]	HABERLE I, SKREIBERG, ŁAZAR J, et al. Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces[J]. Progress in Energy and Combustion Science, 2017,63:204-252.
[2]	张宇, 母军, 李思锦, 等. 阻燃剂硼酸-硼砂对杨木定向刨花板热解特性的影响[J]. 北京林业大学学报, 2015, 37(1):127-133.
	ZHANG Yu, MU Jun, LI Sijin, et al. The effect of boric acid-borax on the pyrolysis characteristics of poplar oriented strand board[J]. Journal of Beijing Forestry University, 2015, 37(1):127-133.
[3]	岳海玲, 杨守生. 刨花板及其木质原材料燃烧热解特性对比试验[J]. 中国安全科学学报, 2012, 22(1):46-52.
	YUE Hailing, YANG Shousheng. Comparative experiments on pyrolysis and combustion properties between particle board and its wood raw materials[J]. China Safety Science Journal, 2012, 22(1):46-52.
[4]	QUINTIERE J G, HARKLEROAD M, WALTON D. Measurement of material flame spread properties[J]. Combustion Science and Technology, 1983, 32(1/2/3/4):67-89. doi: 10.1080/00102208308923653
[5]	WASAN S R, HEES P V, MERCI B. Study of pyrolysis and upward flame spread on charring materials—part I: experimental study[J]. Fire and Materials, 2011, 35(4):209-229. doi: 10.1002/fam.1047
[6]	丁彦铭, 张雪婷, 杜文州, 等. 基于多组分热解气体的炭化可燃物燃烧模拟[J]. 中国安全科学学报, 2020, 30(9):155-163.
	DING Yanming, ZHANG Xueting, DU Wenzhou, et al. Simulation of charring solid combustion based on multiple pyrolysis gases[J]. China Safety Science Journal, 2020, 30(9):155-163.
[7]	GONG Junhui, CHEN Yixuan, JIANG Juncheng, et al. A numerical study of thermal degradation of polymers: surface and in-depth absorption[J]. Applied Thermal Engineering, 2016,106:1366-1379.
[8]	GONG Junhui, GU Youmin, ZHAI Chunjie, et al. A hybrid pyrolysis mechanism of phenol formaldehyde and kinetics evaluation using isoconversional methods and genetic algorithm[J]. Thermochimica Acta, 2020,690:DOI:10.1016/j.tca.2020.178708.
[9]	RICHTER F, REIN G. Heterogeneous kinetics of timber charring at the microscale[J]. Journal of Analytical and Applied Pyrolysis, 2018, 138:1-9. doi: 10.1016/j.jaap.2018.11.019
[10]	BOONMEE N, QUINTIERE J G. Glowing and flaming autoignition of wood[J]. Proceedings of the Combustion Institute, 2002, 29(1): 289-296. doi: 10.1016/S1540-7489(02)80039-6
[11]	BÁEZ S, VASCO D A, DÍAZ A, et al. Computational study of transient conjugate conductive heat transfer in light porous building walls[J]. Ingeniare, 2017, 25(4):654-661.
[12]	MEALY C, BOEHMER H, SCHEFFEY J L, et al. Characterization of the flammability and thermal decomposition properties of aircraft skin composite materials and combustible surrogates[R]. U.S. Department of Transportation Federal Aviation Administration, 2014.
[13]	YUEN R, CASEY R, DAVIS G D, et al. A three-dimensional mathematical model for the pyrolysis of wet wood[J]. Fire Safety Science, 1997,5:189-200.
[14]	ANCA-COUCE A, ZOBEL N, BERGER A, et al. Smouldering of pine wood: kinetics and reaction heats[J]. Combustion & Flame, 2012, 159(4):1708-1719.
[15]	LAUTENBERGER C, FERNANDEZ-PELLO C. A model for the oxidative pyrolysis of wood[J]. Combustion and Flame, 2009, 156(8):1503-1513. doi: 10.1016/j.combustflame.2009.04.001
[16]	SAND U, SANDBERG J, LARFELDT J, et al. Numerical prediction of the transport and pyrolysis in the interior and surrounding of dry and wet wood log[J]. Applied Energy, 2008, 85(12):1208-1224. doi: 10.1016/j.apenergy.2008.03.001
[17]	ZHAI Chunjie, GONG Junhui, ZHOU Xiaodong, et al. Pyrolysis and spontaneous ignition of wood under time-dependent heat flux[J]. Journal of Analytical & Applied Pyrolysis, 2017, 125(5):100-108.
[18]	DING Yanming, WANG Changjian, LU Shouxiang. Modeling the pyrolysis of wet wood using FireFOAM[J]. Energy Conversion and Management, 2015, 98(7):500-506. doi: 10.1016/j.enconman.2015.03.106
[19]	DELICHATSIOS M A. Ignition times for thermally thick and intermediate conditions in flat and cylindrical geometries[J]. Fire Safety Science, 2000,6:233-244.

序号	反应	A /s^-1	E_a /(J·mol^-1)	n	T_p /K
1	水→水蒸气	4.4×10⁷	5.81×10⁴	1.60	346
2	OSB→0.01 OSB残炭1+0.99 OSB气体1	1.3×10⁶	9.68×10⁴	1.00	603
3	OSB残炭1→0.02 OSB残炭2+0.98 OSB气体2	4.0×10⁹	1.43×10⁵	0.73	638
4	OSB残炭2→0.33炭 +0.67 OSB气体3	8.5×10⁵	9.60×10⁴	3.40	672

参数	优化结果	文献来源
参数	优化结果	文献[1]	文献[11]	文献[12]
k/(W·m^-1·K^-1)	0.05+6.00×10^-4T	0.056+2.6×10^-4T	0.106	0.08+1.0×10^-4exp(-0.21T)
C_p/(J·g^-1·K^-1)	3.51-4.45×10^-3T	1.5+1.0×10^-3T	0.700	0.73+2.5×10^-3T

参数	OSB残炭1	OSB残炭2
k/(W·m^-1·K^-1)	0.11+1.2×10^-4T	0.11+1.3×10^-4T
C_p/(J·g^-1·K^-1)	1.20+1.5×10^-4T	0.14+1.0×10^-4T

辐射热流下定向刨花板热解自燃试验及数值模拟

Experimental and numerical study on pyrolysis and autoignition of OSB exposed to radiant heat fluxes

RichHTML

PDF

可视化

摘要/Abstract

引用本文

使用本文

图/表 10

参考文献 19

相关文章 2

编辑推荐

Metrics

本文评价

[1]	孙玉佳. 基于大涡模拟的油池火焰瞬态辐射传热研究[J]. 中国安全科学学报, 2022, 32(4): 65-71.
[2]	项莉, 谢启源, 张杰, 卢启钊, 周锋. LNG槽罐车泄漏-燃烧耦合演化特性分析[J]. 中国安全科学学报, 2020, 30(1): 81-86.