Numerical Investigation on Pyrolysis Characteristics of Dunaliella Salina in CO2 Atmosphere

doi:10.12096/j.2096-4528.pgt.21136

Abstract

Abstract:

In order to study the effect of mass flow rate, gasification temperature and gasification pressure of gasification agent CO₂ on the gasification of Dunaliella salina, the Aspen Plus software was used to simulate the pyrolysis process of Dunaliella salina in CO₂ atmosphere. The results show that when Dunaliella salina is gasified in CO₂ atmosphere, with the increase of CO₂ mass flow rate, the H₂ volume fraction firstly increases and then reduces. When the mass flow of CO₂ is 350 kg/h, the volume fraction of H₂ reaches a maximum of 40.06%. When the gasification temperature is increased from 400 to 900 ℃, the volume fraction of H₂ and CO increases, and the volume fraction of CH₄ decreases. When the gasification temperature is greater than 900 ℃, the volume fraction of H₂, CH₄ and CO tends to be stable. When the gasification temperature increases from 400 to 1 200 ℃, the higher the pressure, the more CH₄ is produced, and the less H₂ and CO are produced. When the gasification temperature was 700 ℃, the pressure has the most significant impact on gas production. Therefore, appropriately changing the mass flow of CO₂ can increase the production of H₂, and appropriately increasing the gasification temperature and reducing the gasification pressure can increase the production of H₂ and CO. However, the production of CH₄ will decrease.

Key words: biomass, gasification of Dunaliella salina, CO₂ gasification agent, pyrolysis characteristic

CLC Number:

TK 6

Feilong DENG, Yao YE, Yang LI, Qiaoli WANG, Junxia ZHANG. Numerical Investigation on Pyrolysis Characteristics of Dunaliella Salina in CO₂ Atmosphere[J]. Power Generation Technology, 2024, 45(1): 113-119.

Figures/Tables 10

Tab. 1 Comparison of biomass gasification and numerical simulation results

产生气体	V(H₂)/%	V(CO₂)/%	V(CO)/%	V(H₂)/V(CO)
实验数据	37.18	10.58	43.99	0.85
模拟结果	37.68	10.08	33.01	1.14

Fig. 1 Reaction flow chart

Tab. 2 Industrial analysis of Dunaliella salina

M_ar/%	A_ar/%	V_ar/%	C_ar/%
4.98	13.54	54.48	27.00

Tab. 3 Element analysis of Dunaliella salina

w(C)/%	w(H)/%	w(N)/%	w(S)/%
39.00	5.37	1.99	0.62

Fig. 2 Influence of CO2 mass flow rate on gas volume fraction

Fig. 3 Influence of temperature on gas volume fraction

Fig. 4 Influence of pressure on the molar flow rate of CH4

Fig. 5 Influence of pressure on the molar flow rate of H2

Fig. 6 Influence of pressure on the molar flow rate of CO

Fig. 7 Influence of pressure on the molar flow rate of CO2

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Numerical Investigation on Pyrolysis Characteristics of Dunaliella Salina in CO₂ Atmosphere

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