Catalytic/inhibitory effects of inorganic elements on biomass char-CO2 gasification reactivity and model construction

doi:10.11949/0438-1157.20220906

Abstract

Abstract:

Based on the simple collision theory, a kinetic model of char gasification reaction with the influence of inorganic elements was established. In the modeling process, the effects of the content of seven inorganic elements, the catalytic/inhibitory factor, and the fully catalytic ratio of single inorganic element on the char-CO₂ reactivity were considered. In the experimental part, four biomass samples were selected and placed in a micro-fluidized bed reactor to test the char-CO₂ reactivity, and compared with the model calculated values. The results show that the model can accurately predict the char-CO₂ reactivity, and also shows adaptability to different samples. The model can achieve quantitative prediction of char-CO₂ reactivity by inputting sample characteristic parameters and reaction conditions. The establishment of this model shows that the general law of biomass thermal conversion process exists, which can provide a theoretical reference for further clarifying the gasification reaction law.

Key words: biomass, gasification, kinetic modeling, inorganic matter, fluidized-bed, carbon dioxide

摘要：

基于简单碰撞理论，建立了含有无机元素影响的焦炭气化反应动力学模型。建模过程中，考虑了七种无机元素含量、催化/抑制能力以及单一无机元素饱和催化倍率对焦炭反应性的影响。实验部分，选取四种生物质样品置于微型流化床反应器中测试了焦炭反应性，并与模型计算值进行了对比，结果表明模型能够较好预测焦炭反应性，同时表现出对不同样品的适应性。该模型能够通过输入样品特性参数和反应工况条件实现焦炭反应性的定量预测。该模型的建立表明固体燃料通用气化反应的规律是存在的，可以为进一步阐明气化反应规律提供理论参考。

关键词: 生物质, 气化, 动力学模型, 无机元素, 流化床, 二氧化碳

CLC Number:

TK 6

Qianshi SONG, Xiaowei WANG, Wei ZHANG, Xiaohan WANG, Haowen LI, Yu QIAO. Catalytic/inhibitory effects of inorganic elements on biomass char-CO₂ gasification reactivity and model construction[J]. CIESC Journal, 2022, 73(11): 5240-5250.

宋谦石, 王潇伟, 张威, 汪小憨, 李浩文, 乔瑜. 无机元素对生物质焦炭-CO₂气化反应性的催化/抑制作用研究及模型构建[J]. 化工学报, 2022, 73(11): 5240-5250.

Figures/Tables 10

References 37

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样品名称	工业分析 /% (质量，干燥基）			元素分析 /% (质量，干燥基）					M_v/ (g/mol）
样品名称	V	FC	A	C	H	N	S	O^①	M_v/ (g/mol）
烟杆	79.65	13.19	7.16	44.90	5.98	1.70	0.01	40.25	72.43
玉米芯	85.77	12.72	1.51	44.18	6.11	0.10	0.03	48.07	80.93
杉木	88.43	11.49	0.08	49.40	6.17	0.01	0.01	44.33	92.35
核桃皮	82.17	16.38	1.45	48.01	6.14	0.37	0.02	44.01	60.21

样品名称	工业分析 /% (质量，干燥基）			元素分析 /% (质量，干燥基）					M_v/ (g/mol）
样品名称	V	FC	A	C	H	N	S	O^①	M_v/ (g/mol）
烟杆	79.65	13.19	7.16	44.90	5.98	1.70	0.01	40.25	72.43
玉米芯	85.77	12.72	1.51	44.18	6.11	0.10	0.03	48.07	80.93
杉木	88.43	11.49	0.08	49.40	6.17	0.01	0.01	44.33	92.35
核桃皮	82.17	16.38	1.45	48.01	6.14	0.37	0.02	44.01	60.21

生物质样品	N_ion,K/(mg/kg)	N_ion,Na/(mg/kg)	N_ion,Ca/(mg/kg)	N_ion,Mg/(mg/kg)	N_ion,Fe/(mg/kg)	Si/(mg/kg)	Al/(mg/kg)
烟杆	309	53	9717	822	891	7046	3254
玉米芯	434	110	94	159	18	6136	2965
杉木	103	104	151	121	132	5465	2979
核桃皮	400	5	120	53	323	6539	2945

生物质样品	N_ion,K/(mg/kg)	N_ion,Na/(mg/kg)	N_ion,Ca/(mg/kg)	N_ion,Mg/(mg/kg)	N_ion,Fe/(mg/kg)	Si/(mg/kg)	Al/(mg/kg)
烟杆	309	53	9717	822	891	7046	3254
玉米芯	434	110	94	159	18	6136	2965
杉木	103	104	151	121	132	5465	2979
核桃皮	400	5	120	53	323	6539	2945

无机元素	拟合线斜率	催化指数α_i,*	抑制指数α_j,*
K	0.611	1.000	—
Na	0.519	0.849	—
Ca	0.752	1.231	—
Mg	0.125	0.205	—
Fe	0.373	0.610	—
Si	-0.451	—	0.738
Al	-0.379	—	0.620

Catalytic/inhibitory effects of inorganic elements on biomass char-CO₂ gasification reactivity and model construction

无机元素对生物质焦炭-CO₂气化反应性的催化/抑制作用研究及模型构建

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Figures/Tables 10

References 37

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生物质样品	R_c0×10³/min^-1
生物质样品	873 K	923 K	973 K	1023 K
烟杆焦炭	9.33	26.77	68.67	113.00
玉米芯焦炭	4.05	15.17	35.52	48.32
杉木焦炭	0.28	0.73	1.80	5.44
核桃皮焦炭	1.45	7.60	18.11	35.90

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