生物质氧气气化制备中热值燃气的工艺优化及其示范工程

doi:10.3969/j.issn.0253-2417.2023.04.005

Abstract

Abstract:

The oxygen gasification of pine sawdust for the production of bio-gas was conducted in a high-temperature fixed bed reactor. The impacts of gasification temperature and equivalence ratio(ER) on oxygen gasification prepared bio-gas heat value, bio-gas yield, and the volumetric fraction of each component in bio-gas were evaluated. The obtained optimal process parameters were debugged and validated in the demonstration project of biomass gasification to generate bio-gas for industrial boilers. The results showed that the gasification temperature of 850-950 ℃, the heat value of the gas raised initially then fell with the ER increase, reaching its maximum value when the ER was 0.24. Moreover, the gasification temperature exhibited a significant effect on oxygen gasification of sawdust. With the rise of gasification temperature, the gas heat value and the volumetric fraction of H₂, CO, CH₄ in gas increased, and the gas production rate increased initially, then decreased and reached its highest value at 900 ℃. Under the optimized conditions of gasification temperature of 900 ℃ and the ER of 0.24, the heat value of prepared gas was 13.14 MJ/m³, the gas yield was 0.98 L/g, and the volumetric fractions of H₂, CO, CH₄ and C₂H_m in the gas were 17.64%, 39.78%, 12.45% and 2.76%, respectively. These parameters were implemented in the demonstration engineering, resulting in a calorific value of 10.90 MJ/m³ and a gas production rate of 1.02 L/g.

Key words: oxygen gasification, ER, heat value, gas yield, demonstration engineering

CLC Number:

TQ35

Wei XU, Hao YING, Yunjuan SUN, Yu XU, Jianchun JIANG. Process Optimization and Demonstration Engineering on Producing Medium Heat Value Bio-gas Through Biomass Oxygen Gasification[J]. Chemistry and Industry of Forest Products, 2023, 43(4): 31-37.

Figures/Tables 5

Table 1

Fig.1

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Fig.3

Table 2

References 19

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反应类型 reaction type	反应方程式 reaction equation
总反应 total reaction	生物质 biomass+O₂→H₂+CO+CO₂+CH₄+C₂H_m+Q kJ/mol
焦油裂解反应 tar cracking reaction	焦油 tar→aH₂+bCH₄+cCO+dCO₂+eH₂O+fC₂H_m+Q kJ/mol
碳不完全燃烧反应 incomplete combustion reaction of carbon	C+1/2O₂→CO
碳完全燃烧反应 complete combustion reaction of carbon	C+O₂→CO₂
甲烷化反应 methanation reaction	C+2H₂→CH₄
歧化反应 disproportionated reaction	C+CO₂→2CO
水蒸气还原反应 steam reduction reaction	C+H₂O→CO+H₂
CO的变换反应 CO transformation reaction	CO+H₂O→CO₂+H₂
甲烷重整反应 methane reforming reaction	CH₄+H₂O→CO+3H₂
H₂燃烧反应 H₂ combustion reaction	H₂+1/2O₂→H₂O
CO燃烧反应 CO combustion reaction	2CO+O₂→2CO₂

温度/℃ temp.	ER	燃气组分 gas composition¹⁾/%						Q_LHV/(MJ·m^-3) lower heat value	产气率/(L·g^-1) gas yield	固体产率/% solid yield
温度/℃ temp.	ER	H₂	O₂	CO₂	CO	CH₄	C₂H_m	Q_LHV/(MJ·m^-3) lower heat value	产气率/(L·g^-1) gas yield	固体产率/% solid yield
800	0.21	14.91	2.55	38.39	32.96	8.04	3.15	10.65	0.76	8.20
	0.24	14.89	1.27	41.04	31.61	7.98	3.21	10.49	0.81	5.25
	0.27	15.07	2.11	44.77	27.23	7.81	2.99	9.76	0.84	4.88
	0.30	15.87	1.78	44.49	27.72	7.39	2.76	9.61	0.89	3.43
	0.33	14.36	3.78	46.36	25.93	6.89	2.67	8.99	0.91	2.20
850	0.21	19.25	1.59	31.23	32.36	12.97	2.60	12.46	0.89	3.60
	0.24	15.95	3.34	29.31	36.28	11.91	3.21	12.61	0.89	2.05
	0.27	14.78	1.22	33.29	35.74	12.26	2.71	12.22	0.88	1.54
	0.30	11.89	1.78	37.61	34.24	10.85	3.30	11.59	0.97	1.43
	0.33	11.72	2.14	42.24	29.74	11.25	2.90	10.89	0.94	1.57
900	0.21	17.80	2.02	31.10	35.15	11.58	2.35	12.00	0.99	0.80
	0.24	17.64	0.71	26.66	39.78	12.45	2.76	13.14	0.98	1.37
	0.27	15.87	3.98	25.20	40.12	12.05	2.78	12.86	0.95	1.29
	0.30	16.95	1.74	30.14	39.95	9.46	1.76	11.38	0.96	1.71
	0.33	14.82	2.00	37.33	35.17	8.10	2.58	10.57	0.97	1.89
950	0.21	18.43	1.34	22.35	43.83	12.00	2.05	13.12	0.93	1.00
	0.24	19.78	3.48	20.12	42.04	12.37	2.22	13.28	0.93	1.14
	0.27	20.13	1.24	24.31	40.28	11.88	2.18	12.89	0.96	1.54
	0.30	17.63	2.28	24.37	41.29	11.93	2.51	12.98	0.92	2.00
	0.33	17.92	2.23	26.42	38.85	12.15	2.43	12.73	0.96	1.26

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Process Optimization and Demonstration Engineering on Producing Medium Heat Value Bio-gas Through Biomass Oxygen Gasification

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