藻渣热解特性及动力学分析

doi:10.3969/j.issn.1673-5854.2022.06.006

Abstract

Abstract:

The effect of heating rate in N₂ atmosphere on the pyrolysis characteristics of chlorella after Soxhlet fat extraction was studied by thermogravimetric experiment. The rapid pyrolysis experiment in tubular furnace under N₂ atmosphere showed that at 400℃, the pyrolysis conversion rate was the highest, where the yield of biooil and the pyrolysis gas were 57.6% and 10% respectively. The pyrolysis kinetics of algal residue was analyzed and compared by equal conversion methods of FWO and KAS. The results showed that the pyrolysis curve of algal residue could be divided into three stages, where the main pyrolysis stage was 155-800℃. There were two weight loss peaks in the DTG curve of algal residue. With the increase of heating rate, TG and DTG curves shifted to the high temperature zone, and the maximum weight loss rate and residual solid mass increased. Under N₂ atmosphere, the apparent activation energy and pre-exponential factor of the main pyrolysis stage of algal residue were 228.46 kJ/mol and 2.49×10²¹ min^-1, respectively. At this stage, the pyrolysis data of algal residue was well simulated using FWO and KAS method, and the linear fitting correlation coefficient (R²) was above 0.96. The best pyrolysis function was dα/dT=2.49×10²¹/β exp(-228.46/(RT))(1-α)⁸.

Key words: algal residue, pyrolysis, activation energy, kinetics

CLC Number:

TQ35
TK6

Si LI, Shaojian JIANG, Changzhu LI, Xudong LIU, Aihua ZHANG, Zhihong XIAO. Pyrolysis Characteristics and Kinetics Analysis of Algae Residue[J]. Biomass Chemical Engineering, 2022, 56(6): 36-42.

Figures/Tables 8

Table 1

Table 2

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Table 3

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Fig.4

References 29

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原料 raw material	元素分析ultimate analysis/%					工业分析proximate analysis/%				高位热值/(MJ·kg^-1) high calorific value
原料 raw material	N	C	H	S	O	M	V	A	FC	高位热值/(MJ·kg^-1) high calorific value
藻渣algal residue	9.28	51.37	7.37	0.70	31.28	1.89	79.83	5.24	13.05	22.44

机理 mechanism	函数符号 symbol	f(α)	G(α)
一级反应first order reaction	F₁	1-α	-ln(1-α)
n级反应n-order reaction	F_n	(1-α)ⁿ	[(1-α)^1-n-1]/(n-1)
一维扩散one dimensional diffusion	D₁	0.5α	α²
二维扩散two dimensional diffusion	D₂	[-ln(1-α)]^-1	α+(1-α)ln(1-α)
相界反应，圆柱形对称phase boundary reaction, cylindrical symmetry	R₂	2(1-α)^1/2	1-(1-α)^1/2
相界反应，球形对称phase boundary reaction, spherical symmetry	R₃	3(1-α)^2/3	1-(1-α)^1/3

升温速率/ (℃·min^-1) heating rate	起始热解温度(T_s)/℃ initial pyrolysis temperature	第一个失重峰对应温度(T_f)/℃ temperature corresponding to first weight loss peak	第二个失重峰对应温度(T_d)/℃ temperature corresponding to second weight loss peak	主要热解结束温度(T_e)/℃ main pyrolysis end temperature	质量损失率% mass loss rate
10	150.3	280.4	321.3	498.8	71.29
20	155.3	290.3	334.4	509.2	71.13
30	160.5	299.5	342.5	521.5	70.92

α	FWO			KAS
α	拟合曲线fitting curve	R²	E/(kJ·mol^-1)	拟合曲线fitting curve	R²	E/(kJ·mol^-1)
0.2	y=-24 968.89x+48.83	0.991 26	197.41	y=23 884.05x+34.24	0.990 48	198.57
0.3	y=-24 950.13x+47.10	0.996 98	197.26	y=23 823.48x+32.43	0.996 71	198.07
0.4	y=-26 219.98x+47.76	0.979 95	207.30	y=25 054.25x+33.03	0.978 12	208.30
0.5	y=-27 398.50x+48.28	0.981 73	216.61	y=26 194.12x+33.48	0.980 07	217.78
0.6	y=-31 165.95x+52.93	0.968 36	246.40	y=29 923.32x+38.07	0.965 79	248.78
0.7	y=-37 783.17x+61.07	0.981 59	298.72	y=36 843.45x+46.68	0.977 84	306.32

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Pyrolysis Characteristics and Kinetics Analysis of Algae Residue

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