Study on Gas Production Characteristics and Kinetics of Coal and Biomass Co-gasification Under CO2 Atmosphere

doi:10.12068/j.issn.1005-3026.2025.20240150

Abstract

Abstract:

A controlled-atmosphere tube furnace was used to study the gas production and reaction kinetics of coal and biomass during gasification under CO₂ atmosphere. It is found that the pyrolysis of coal and biomass under N₂ atmosphere is divided into three stages： dehydration （30~210 ℃）， rapid pyrolysis （210~400 ℃）， and slow pyrolysis （400~1 000 ℃）. Gasification under CO₂ atmosphere is divided into four stages： dehydration （30~210 ℃）， volatile release （210~400 ℃）， slow weight loss （400~660 ℃）， and Boudouard reaction （660~1 000 ℃）. The gasification conversion rate under CO₂ atmosphere is about 85%， which is higher than that under N₂ atmosphere （53%）. The gasification reaction under CO₂ atmosphere requires higher activation energy than that under N₂ atmosphere， but the reaction rate is faster. The gases produced by the gasification of coal and biomass under CO₂ atmosphere mainly include CO， CO₂， CH₄， and H₂. At 800 ℃， CO gas is regenerated， indicating that CO₂ has a Boudouard reaction with carbon as an oxidant at high temperatures. CO₂ inhibits the formation of CH₄， H₂， and C _m H _n， which contain hydrogen and gases with high calorific values.

Key words: CO₂ atmosphere, coal, biomass, gasification characteristics, reaction kinetics

CLC Number:

TK 6

Xi-wen YAO, Hong-bai ZHANG, Kai-li XU, Lei-lei ZHANG. Study on Gas Production Characteristics and Kinetics of Coal and Biomass Co-gasification Under CO₂ Atmosphere[J]. Journal of Northeastern University(Natural Science), 2025, 46(12): 124-131.

Figures/Tables 15

Fig.1 Experimental system of gasification based on tube furnace

Table 1 Industrial analysis and elemental analysis of experimental samples(mass fraction)

样品	工业分析				元素分析
样品	挥发分	水分	固定碳	灰分	C	H	O	N	S
麦秆	67.00	5.98	17.87	9.50	42.10	5.57	38.16	0.50	0.21
精煤	28.89	4.03	57.36	9.72	73.64	3.17	9.66	0.60	0.65

Fig.2 TG curves of pyrolysis and gasification of coal and biomass under N2 and CO2 atmospheres

Fig.3 DTG curves of pyrolysis and gasification of coal and biomass under N2 and CO2 atmospheres

Fig.4 Linear fitting curve plot under N2 atmosphere

Fig.5 Linear fitting curve under CO2 atmosphere

Table 2 Kinetic parameters of coal and biomass under N2 and CO2 atmospheres

活化能

E/(kJ·mol^-1)

频率因子

A/min^-1

线性指数

R²

CO₂

790~1 000

l n g α T 2 = - 4.704 55 T - 9.936 87

N₂

l n g α T 2 = - 3.679 06 T - 8.405 3

30.588

1.64×10⁵

0.998

Table 2 Kinetic parameters of coal and biomass under N2 and CO2 atmospheres

气氛

温度/℃

β/(℃·min^-1)

拟合方程

活化能

E/(kJ·mol^-1)

频率因子

A/min^-1

线性指数

R²

CO₂

790~1 000

l n g α T 2 = - 4.704 55 T - 9.936 87

39.114

9.72×10⁵

0.974

N₂

240~390

l n g α T 2 = - 3.679 06 T - 8.405 3

30.588

1.64×10⁵

0.998

Fig.6 Gas production law of coal and biomass co-gasification under N2 atmosphere

Fig.7 Gas production law of coal and biomass co-gasification under atmosphere with 25% CO2 volume fraction

Fig.8 Variation of CO produced by co-gasification of coal and biomass under different CO2 volume fraction

Fig.9 Variation of CH4 produced by co-gasification of coal and biomass under different CO2 volume fraction

Fig.10 Variation of H2 produced by co-gasification of coal and biomass under different CO2 volume fraction

Fig.11 Variation of C m H n produced by co-gasification of coal and biomass under different CO2 volume fraction

Table 3 Effect of different CO2 volume fraction on

CO₂体积分数/%	气体体积分数/%				Q_LHV
CO₂体积分数/%	CO	CH₄	C _m H _n	H₂	MJ·m^-3
0	13.92	28.41	21.36	25.18	2.74
5	45.07	13.26	8.11	10.55	1.64
10	47.60	8.09	4.58	6.78	1.24
15	45.99	6.57	3.92	5.26	1.11
20	43.17	5.07	2.90	3.73	0.94
25	39.84	4.52	2.90	2.68	0.86

Fig.12 Comparison of gasification product yields of coal and biomass at different CO2 volume fraction

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Study on Gas Production Characteristics and Kinetics of Coal and Biomass Co-gasification Under CO₂ Atmosphere

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