中药固废原料特性与热解失重特性关联性分析

doi:10.3969/j.issn.1673-5854.2022.06.002

Abstract

Abstract:

In order to understand the relationship between the pyrolysis characteristics of herb residues and their composition & structure, the composition structure and chemical composition of 10 typical Chinese planted herb residues were determined, and the pyrolysis weight loss characteristics were carried by the thermogravimetric analyzer. Through the correlation analysis between the characteristics of the feedstock and the pyrolysis process behavior, the physical factors affecting the pyrolysis process of herb residues and the associated coupling mechanism were discussed. Results showed that herb residues were detected with high content of nitrogen and sulfur. The root samples had high cellulose content and the leaf samples had high lignin content. The ability of thermal decomposition to remove volatile matter of leaves, stems, and seeds of herb residue samples were poor, and the activation energy of pyrolysis obtained by Coats-Redfern integration method was basically within 100 kJ/mol. Roots of herb residue samples were easier to devolatile, and the activation energy was higher than 110 kJ/mol. Among them, yam sample had the strongest pyrolysis ability to devolatilize, with the activation energy of 169.83 kJ/mol. The lowest activation energy was obtained in the artemisia annua sample, and the correspongding value was 64.32 kJ/mol. Cellulose and lignin were the two main physical properties affecting pyrolysis devolatilization and activation energy. The content of cellulose and lignin could be used to predict the pyrolysis devolatilization ability and activation energy of herb residues.

Key words: herb residues, feedstock characteristics, pyrolysis, thermodynamics analysis, correlation

CLC Number:

TQ35
TK6

Yun ZHOU, Haiping YANG, Jun ZOU, Zihao LIU, Hanping CHEN. Correlation Analysis Between Characteristics of Feedstock and Thermogravimetric/Pyrolytic Characteristics of Herb Residues[J]. Biomass Chemical Engineering, 2022, 56(6): 8-16.

Figures/Tables 10

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References 28

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样品¹⁾ sample	工业分析proximate analysis/%²⁾				元素分析ultimate analysis/%³⁾					低位热值/(MJ·kg^-1) low calorific value
样品¹⁾ sample	M	A	V	FC	C	H	O	N	S	低位热值/(MJ·kg^-1) low calorific value
XKC	7.35	25.51	63.89	3.26	39.99	5.59	24.50	2.03	0.36	15.66
DZY	9.33	4.86	72.55	13.26	45.45	6.34	40.45	2.25	0.16	22.34
QHY	12.14	12.39	60.79	14.69	45.25	5.99	31.04	3.39	0.24	22.09
ZEX	12.02	1.64	73.86	12.48	44.47	6.78	42.43	4.08	0.37	17.55
SHY	12.44	1.78	76.23	9.55	41.69	6.62	48.03	1.43	0.19	15.50
JIH	10.11	3.47	72.33	14.08	42.42	6.06	45.46	2.04	0.15	17.24
ZCW	10.56	6.76	73.19	9.48	41.03	6.35	43.51	1.43	0.11	19.26
BCH	5.37	4.87	75.47	14.29	45.02	6.31	42.34	1.02	0.17	17.40
XUD	6.72	14.23	67.49	11.57	46.26	6.65	30.44	1.27	0.13	15.74
SZR	4.94	2.84	80.98	11.25	56.13	8.13	26.77	5.73	0.24	25.06

样品sample	有机组成chemical composition/%
样品sample	纤维素cellulose	半纤维素hemicellulose	木质素lignin	萃取物extract
XKC	21.43	14.88	23.71	31.46
DZY	35.49	28.96	23.55	9.73
QHY	11.53	10.06	33.69	42.83
ZEX	61.78	4.41	2.72	30.18
SHY	85.48	3.99	1.60	7.80
JIH	66.30	7.59	12.71	12.52
ZCW	66.90	7.32	3.88	21.09
BCH	32.46	23.12	21.58	22.06
XUD	26.69	20.02	17.34	32.94
SZR	7.93	7.66	36.31	47.97

样品 sample	T_s/℃	(dw/dt)_max/ (%·min^-1)	T_max/℃	(dw/dt)_mean/ (%·min^-1)	R_∞/%	ΔT_1/2/℃	D/ (%³·min^-2·℃^-3)
XKC	235	3.81	339	1.38	61.45	125.64	3.24×10^-5
DZY	245	5.84	336	2.33	69.34	93.53	1.23×10^-4
QHY	232	3.42	310	1.22	59.11	129.11	2.64×10^-5
ZEX	248	6.04	314	2.10	68.43	78.50	1.42×10^-4
SHY	266	9.00	315	2.79	78.07	68.36	3.42×10^-4
JIH	236	6.22	304	2.11	67.07	77.82	1.57×10^-4
ZCW	242	6.74	318	2.21	72.64	80.91	1.74×10^-4
BCH	250	5.86	341	2.28	72.75	106.23	1.07×10^-4
XUD	236	4.50	338	1.47	66.77	118.84	4.66×10^-5
SZR	236	4.27	377	2.18	72.11	157.88	4.75×10^-5

样品 sample	温度区间/℃ temperature range	n	E/(kJ·mol^-1)	A/min^-1	R²
XKC	235~636	2	71.58	5.77×10⁶	0.959 9
DZY	245~515	2	101.63	4.08×10⁹	0.967 2
QHY	232~671	2	64.32	1.32×10⁶	0.951 9
ZEX	248~543	2.5	116.37	1.19×10¹¹	0.938 4
SHY	266~519	3	169.83	1.39×10¹⁶	0.943 6
JIH	236~524	2.5	113.70	1.22×10¹¹	0.944 2
ZCW	242~539	2.5	119.05	2.61×10¹¹	0.951 3
BCH	250~539	2	97.20	1.56×10⁹	0.964 4
XUD	236~645	2.5	90.10	4.28×10⁸	0.964 0
SZR	236~536	1.5	71.74	4.25×10⁶	0.970 5

	T_s	(dw/dt)_max	T_max	(dw/dt)_mean	R_∞	ΔT_1/2	D	E
M水分moisture	-0.32	0.44	-0.86^**	0.13	-0.05	-0.66^*	0.54	0.53
A灰分ash	-0.53	-0.63	0.10	-0.80^**	-0.70^*	0.44	-0.58	-0.56
V挥发分volatile	0.51	0.56	0.39	0.85^**	0.87^**	-0.18	0.48	0.46
FC固定碳fixed carbon	-0.00	0.05	-0.21	0.15	0.06	-0.11	-0.01	0.00
低位热值low calorific value	-0.35	-0.37	0.44	0.01	-0.07	0.52	-0.36	-0.46
C	-0.26	-0.38	0.75^*	0.03	0.12	0.68^*	-0.40	-0.43
H	0.10	0.04	0.64^*	0.37	0.50	0.35	0.02	0.01
O	0.70^*	0.89^**	-0.61^*	0.75^*	0.62	-0.91^**	0.84^**	0.85^**
N	-0.32	-0.40	0.41	-0.09	-0.16	0.52	-0.35	-0.40
S	-0.08	-0.34	0.07	-0.31	-0.40	0.23	-0.26	-0.27
n(H)/n(C)	0.68^*	0.80^**	-0.18	0.67^*	0.75^*	-0.60	0.79^**	0.83^**
n(O)/n(C)	0.67^*	0.88^**	-0.71^*	0.66^*	0.53	-0.96^**	0.85^**	0.86^**
纤维素cellulose	0.68^*	0.92^**	-0.65^*	0.66^*	0.58	-0.94^**	0.91^**	0.94^**
半纤维素hemicellulose	0.13	-0.28	0.33	-0.14	-0.14	0.20	-0.38	-0.34
木质素lignin	-0.62	-0.80^**	0.61	-0.50	-0.49	0.90^**	-0.77^**	-0.86^**
萃取物extract	-0.63	-0.80^**	0.48	-0.65^*	-0.49	0.85^**	-0.76^*	-0.77^**

Correlation Analysis Between Characteristics of Feedstock and Thermogravimetric/Pyrolytic Characteristics of Herb Residues

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