Study on the pyrolysis characteristics of binary mixture of biomass three-component

doi:10.11949/0438-1157.20201876

Abstract

Abstract:

TG-FTIR-MS was used to study the mass loss characteristics and the evolution of small molecule gas during the pyrolysis of binary mixtures, which were mixed by biomass three-component. The results showed that the initial pyrolysis temperature decreased in the co-pyrolysis process. During the co-pyrolysis of cellulose and hemicellulose, the pyrolysis reaction was inhibited and the mass loss rate was reduced. Additionally, the yield of H₂, CH₄and H₂O decreased, while the yield of CO and CO₂ increased. Synergistic effect was found in the co-pyrolysis of lignin and hemicellulose, which promoted the pyrolysis reaction process. For the volatile products, the formation of H₂O was promoted and its yield increased, however, the production of other small molecule gas products was inhibited. This synergistic effect was mainly conducive to the formation of condensable volatile products. Moreover, this effect decreased as the proportion of hemicellulose increased. The entire pyrolysis process of hemicellulose and cellulose exhibited mutual inhibition effects, and the production of small molecule gas products decreased, but the influence decreased with the increase of cellulose ratio.

Key words: biomass, cellulose, hemicellulose, lignin, pyrolysis, binary mixture, synergistic effect

摘要：

采用TG-FTIR-MS研究了生物质三组分二元混合热解过程的失重特性和小分子气体逸出规律。结果表明二元混合组分热解过程降低了热解反应开始温度。纤维素与半纤维素混合热解过程热解反应受到抑制，热解失重率降低，H₂、CH₄和H₂O产量减小，CO和CO₂产量增加。木质素和半纤维素在混合热解过程中存在协同效应，促进热解反应进行，H₂产量增加，然而其他小分子气体产物的生成被抑制，协同效应的效果更有利于可冷凝挥发分产物生成，这种效应随着半纤维素比例增大而减弱。半纤维素和纤维素在整个热解过程表现出相互抑制的效果，其小分子气体产物产量减小，但随着纤维素比例增大，影响减弱。

关键词: 生物质, 纤维素, 半纤维素, 木质素, 热解, 二元混合物, 协同效应

CLC Number:

X 705

FAN Honggang, ZHAO Dandan, GU Jing, WANG Yazhuo, YUAN Haoran, CHEN Yong. Study on the pyrolysis characteristics of binary mixture of biomass three-component[J]. CIESC Journal, 2021, 72(7): 3788-3800.

范洪刚, 赵丹丹, 顾菁, 王亚琢, 袁浩然, 陈勇. 生物质三组分二元混合热解特性研究[J]. 化工学报, 2021, 72(7): 3788-3800.

Figures/Tables 9

Table 1 Proximate analysis and ultimate analysis of biomass three-component

样品	工业分析/%			元素分析/%
样品	挥发分	灰分	固定碳	C	H	N	O^①
CE	91.26	0.16	8.58	42.88	6.47	0.03	50.46
XY	96.62	0.27	3.11	42.55	6.53	0.05	50.60
LG	45.47	16.83	37.7	50.08	4.96	0.00	28.13

Fig.1 TG and DTG curves of samples

Table 2 Thermal mass loss characteristics of samples

样品	T_s/℃	T_max/℃	T_e/℃	D_max/ (%/min)	热解残留/%
CE	264.50	347.52	414.63	92.27	11.81
CELG-31	189.07	322.76	528.59	24.16	25.38
CELG-11	186.26	321.14	529.24	17.98	32.63
CELG-13	180.60	315.53	529.03	11.46	39.21
LG	221.08	321.14	541.01	9.31	51.73
LGXY-31	172.92	192.67	533.76	29.99	40.33
LGXY-11	164.92	185.7	531.75	91.66	31.58
LGXY-13	174.14	197.21	531.99	179.96	25.49
XY	201.55	265.03	329.68	78.23	15.82
XYCE-31	202.06	300.09	388.13	25.89	19.29
XYCE-11	192.21	351.93	375.41	43.66	17.14
XYCE-13	193.94	350.81	377.25	58.13	14.18

Fig.2 The experimental and theoretical TG curves of the binary mixture as well as the difference between the experimental and theoretical values of mass loss

Fig.3 FTIR spectra of samples

Fig.4 Mass spectra of small molecule gas during the pyrolysis of biomass three-component

Fig.5 The MS curves of small molecule gas as well as the experimental and theoretical values of peak area during the co-pyrolysis of cellulose and lignin

Fig.6 The MS curves of small molecule gas as well as the experimental and theoretical values of peak area during the co-pyrolysis of lignin and hemicellulose

Fig.7 The MS curves of small molecule gas as well as the experimental and theoretical values of peak area during the co-pyrolysis of hemicellulose and cellulose

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