水/二氧化碳气氛下酒糟催化气化反应特性的研究

doi:10.19964/j.issn.1006-4990.2022-0243

Abstract

Abstract:

The gasification experiments on distillers′ grain was conducted in a fixed-bed gasification plant with red mud as the catalyst and H₂O/CO₂ as the gasification agent.The effects of red mud addition，gasification temperature and H₂O/CO₂ ratio on the gasification characteristics of the distillers′ grain were investigated and the synergistic mechanism of H₂O/CO₂co-gasification was discussed.The results showed that the gasification activity was best when red mud addition was 20%（mass fraction）.The increased gasification temperature was beneficial to the gasification reaction activity.When V（H₂O）/V（CO₂） was increased，the syngas yield and n（H₂）/n（CO） was also increased，up to 270.7 mmol/g and 6.67.The co-gasification under H₂O/CO₂ mixed atmosphere produced significant synergistic effect，and the synergistic factor was peaked at 60% H₂O-40% CO₂（volume fraction）.Raman，SEM and BET analysis showed that the amorphous carbon and amorphous carbon structure of the distillers′ grain coke in the H₂O/CO₂mixed atmosphere was more severely damaged than that in pure H₂O or CO₂，which verified that CO₂and H₂O existed the synergistic effect of in the distillers′ grain gasification.CO₂ was more prone to gasification on the surface of distiller′s grains coke，forming a large number of micropores to increase the specific surface area.Carbon with H₂O had stronger permeability to facilitate the formation of mesopores.In H₂O/CO₂ mixed atmosphere，the interaction between CO₂ and H₂O made the micropores of distiller′s grains coke to develop into mesopores and macropores and promoted the gasification reaction to the interior of distillers′ grains granule，which triggered the synergistic effect.

Key words: distillers′^grains, synergistic effect, H₂O/CO₂, catalytic gasification, red mud

CLC Number:

O643.3

LI Songhong,ZHOU Songhua,ZHAO Aiming,DONG Wenyan,JIANG Chunyan,CAO Yang,AO Xianquan. Study on catalytic gasification reaction of distillers′grains under H₂O/CO₂ atmosphere[J]. Inorganic Chemicals Industry, 2023, 55(2): 132-140.

Figures/Tables 14

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工业分析，w/%					元素分析，w/%
M_ad	V_d	A_d	F_cd		C	H	N	S	O*
9.44	69.47	5.00	16.09		60.10	4.82	3.26	0.28	31.09

不同气氛下的样品	理论反应性指数	实际反应性指数	协同因子
100%CO₂	0.014 6	0.014 6	1.000
20%H₂O-80%CO₂	0.015 1	0.021 4	1.418
40%H₂O-60%CO₂	0.015 8	0.024 2	1.535
60%H₂O-40%CO₂	0.016 4	0.028 1	1.712
80%H₂O-20%CO₂	0.016 9	0.026 4	1.562
100%H₂O	0.017 5	0.017 5	1.000

样品	S_BET （m²·g^-1）	S_micro （m²·g^-1）	V_micro （cm³·g^-1）	V_meso （cm³·g^-1）	L_mpps/ nm	V_total （cm³·g^-1）
100%CO₂	661	290	0.125	0.193	4.617	0.376
100%H₂O	623	265	0.116	0.387	7.007	0.503
60%H₂O-40%CO₂	576	238	0.092	0.413	8.262	0.567
80%H₂O-20%CO₂	615	255	0.112	0.361	6.215	0.516

不同气氛下的气化半焦	A_D3/A_G	A_D1/A_G
100%CO₂	3.583	5.345
100%H₂O	2.076	4.416
60%H₂O-40%CO₂	1.398	2.818
80%H₂O-20%CO₂	1.866	3.099

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Study on catalytic gasification reaction of distillers′grains under H₂O/CO₂ atmosphere

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