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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

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Front. Chem. Sci. Eng.    2024, Vol. 18 Issue (11) : 121    https://doi.org/10.1007/s11705-024-2472-7
Comparison of CO2 with H2O as the transport medium in a biomass supercritical water gasification system
Weizuo Wang, Bingru Lu, Jinwen Shi, Qiuyang Zhao, Hui Jin()
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Abstract

Supercritical water gasification is a clean technology for biomass conversion and utilization. In supercritical water gasification systems, H2O is often used as the transport medium. Decreases in the reaction temperature at the gasification area and in the heating rate of biomass may limit the gasification rate and efficiency. In this paper, CO2 is used as the transport medium due to its relatively low critical point and specific heat capacity. Moreover, a corn stalk gasification system with different transport media is established in this paper, and the influences of various operating parameters, such as temperature, pressure and feedstock concentration, are investigated. The results show that the gas yield in the CO2-transport system decreases by no more than 5 wt %. In addition, thermodynamic analysis reveals that a system with CO2 as transport medium consumes approximately 25% less electricity than a system with H2O as the transport medium. In addition, the reaction heat absorption decreases. The results show the superiority of CO2 to H2O as a transport medium.
Keywords biomass supercritical water gasification      hydrogen production      CO2 transport      energy and exergy analyses     
Corresponding Author(s): Hui Jin   
Just Accepted Date: 27 June 2024   Issue Date: 06 August 2024
 Cite this article:   
Weizuo Wang,Bingru Lu,Jinwen Shi, et al. Comparison of CO2 with H2O as the transport medium in a biomass supercritical water gasification system[J]. Front. Chem. Sci. Eng., 2024, 18(11): 121.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2472-7
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I11/121
Feedstock Elemental analysis/wt % Proximate analysis/wt % Lower heating value/(106 J·kg?1)
Cad Had Nad Sad Oad Mad Aad Vad FCad
Corn stalks 41.18 4.96 0.78 0.19 30.90 8.02 6.46 67.55 17.97 15.58
Tab.1  Elemental and proximate analyze of corn stalksa)
Fig.1  Flowchart of the system with CO2 or H2O as the transport medium.
Fig.2  Influences on the gas production yield and HE in the system at different (a) temperatures and (b) pressures.
System Changes in parameters Changes in production yields/(kg·kg?1 feedstock)
Temperature/°C Pressure/MPa H2 yield CH4 yield CO yield CO2 yield
CO2-transport system 550–800 23 0.094–0.131 (increase) 0.082–0.000 (decrease) 0.020–0.082 (increase) 5.249–5.377 (increase)
650 23–29 0.129–0.125 (decrease) 0.010–0.017 (increase) 0.046–0.047 (increase) 1.406–1.386 (decrease)
H2O-transport system 550–800 23 0.114–0.132 (increase) 0.038–0.000 (decrease) 0.006–0.021 (increase) 1.394–1.475 (increase)
650 23–29 0.132–0.130 (decrease) 0.002–0.004 (increase) 0.012–0.012 (increase) 1.483–1.376 (decrease)
Tab.2  Changes in production yields with each parameter
Fig.3  Production yields under different conditions.
Fig.4  Influences on the mole fraction of each gas product: (a) at different temperatures and (b) at different pressures.
Fig.5  Influences on gas production, HE and gas yield in the system (a) gas production and HE at different slurry/water ratios; (b) gas production and HE at different slurry transport concentrations; (c) total gas production in the CO2-transport system; (d) total gas production in the H2O-transport system; (e) gas yield at different slurry/water ratios; and (f) gas yield at different transport concentrations of slurry.
Fig.6  Influence on the mole fraction of each gas product: (a) different slurry/water ratios and (b) different slurry transport concentrations.
Fig.7  Sankey diagram of the flow in the systems (temperature 650 °C; pressure 23 MPa; slurry/water ratio: 0.1; slurry transport concentration: 20 wt %): (a) energy flow in the CO2-transport system; (b) energy flow in the H2O-transport system; (c) exergy flow in the CO2-transport system; (d) exergy flow in the H2O-transport system.
Fig.8  Influences of temperature and pressure on energy consumption: (a, c) CO2-transport system and (b, d) H2O-transport system.
Fig.9  Influences of the slurry/water ratio and slurry transport concentration on electricity consumption: (a, c) CO2-transport system and (b, d) H2O-transport system.
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