A study of char gasification in H2O and CO2 mixtures: Role of inherent minerals in the coal

Wang, Yulong; Zhu, Shenghua; Gao, Mengdi; Yang, Zhirong; Yan, Lunjing; Bai, Yonghui; Li, Fan

doi:10.1016/j.fuproc.2015.06.001

Cited by 65 publications

(25 citation statements)

References 35 publications

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“…The same conclusion was also obtained by Scala [15]. Wang [16] found that the reactivity of the CO2 and H2O gasification was better than that of any single agent and the synergistic effect was related to inherent minerals. Chen et al [17] found that the char gasification in mixture of CO2 and H2O was obviously lower than the sum of two rates of char independently reacting but higher than rate of each independent reaction.…”

Section: Introductionsupporting

confidence: 76%

Thermodynamic analysis of synergistic coal gasification using blast furnace slag as heat carrier

Duan

Xie

et al. 2016

International Journal of Hydrogen Energy

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In this paper, a thermodynamic analysis of the synergistic coal/CO2/H2O gasification process with BFS (blast furnace slag) as heat carrier was performed using the Gibbs free energy minimization approach through Lagrange multiplier method. The effect of temperature, pressure and C/CO2/H2O were investigated. Carbon, CO2 and H2O conversion, H2 and CO yield, and H2/CO ratio were used to characterize the synergistic gasification performance. The results showed that the atmospheric pressure was preferable for coal gasification and the increasing of temperature caused the increase in carbon conversion and syngas production. The optimal temperature of the synergistic gasification was 800-900 ºC. Not only did it ensure the coal gasification reaction completely, but also it recovered the BFS waste heat effectively. The results clearly showed that the addition of H2O and CO2 could lead to the reduction of the carbon residue and increase of the production of H2 and CO, respectively. Meanwhile, it was beneficial to reduce the waste heat using to heating extra steam and enhance the coal/CO2 gasification reaction rate by controlling the addition of CO2 and H2O reasonably. Moreover, the production syngas application was also investigated by changing the relative CO2/C ratio and H2O/C ratio in the feed to modify the H2/CO ratio.

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Section: Introductionsupporting

confidence: 76%

Thermodynamic analysis of synergistic coal gasification using blast furnace slag as heat carrier

Duan

Xie

et al. 2016

International Journal of Hydrogen Energy

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“…(8)) reactions. In the previous studies, the synergetic effect of the mixed agent of CO 2 and H 2 O with respect to the kinetic rates has been clarified [26][27][28]. Comparatively, the thermodynamics of the M A N U S C R I P T…”

Section: Syngas Yields: Influence Of Reacted H 2 O and Co 2 Amountsmentioning

confidence: 99%

“…For the enhancement of H 2 production and high reactivity, H 2 O agent can be chosen while the employment of CO 2 gas shows the advantage of CO yield enhancement. To combine the advantages of these two agents especially adjust the chemical compositions of syngas, a mixed agent of CO 2 and H 2 O could be selected and the synergetic effect in kinetics has been discovered in the previous studies [26][27][28]. Herein the thermodynamic characteristics of biomass gasification, in a mixed agent of CO 2 and H 2 O and in the presence of hot slags, were identified where the target syngas composed of CO, H 2 and CH 4 was analyzed as well as the polluting gas releases of NH 3 , NO and NO 2 , which could, thus, provide key clues toward utilization of this novel method.…”

Section: Introductionmentioning

confidence: 99%

Biomass gasification using the waste heat from high temperature slags in a mixture of CO2 and H2O

Sun

Chen

Zhang

2019

Energy

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The mechanisms of a novel method, biomass gasification under a mixed agent of CO 2 and H 2 O using the thermal heat in high temperature (1450-1650 o C) slags, were identified in this study for the purpose of biomass treatment in the agriculture and slag disposal in the steel industry. The characteristics of gasification equilibriums, with varying factors including temperature, pressure, reacted CO 2 and H 2 O amounts, were clarified especially the roles of hot slags. Both the target syngas including CO, H 2 and CH 4 and the polluting gases comprising of NH 3 , NO and NO 2 were considered here.The results indicated that compared to the limited influence of blast furnace slags, the introduction of steel slags remarkably increased both the syngas yields and the char formed. Furthermore, it was found that there existed a transition temperature range for the H 2 production and NH 3 release, providing significant ideas for syngas optimization. The present study could thus not only offer important clues for the scientific understandings of biomass gasification using the thermal heat in hot slags but also show important guidance toward utilization of this emerging method.

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“…The iron oxides formed from siderite have a catalytic effect (Smirnov at al. 2019;Wang at al. 2016;Yang at al.…”

Section: Introductionmentioning

confidence: 99%

An ex Situ Underground Coal Gasification Experiment with a Siderite Interlayer. Course of the Process, Production Gas, Temperatures and Energy Efficiency

Wiatowski

Kapusta

Nowak

et al. 2020

Preprint

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A 72-hour ex situ hard coal gasification test in one large block of coal was carried out. The gasifying agent was oxygen with a constant flow rate of 4.5 Nm3/h. The surroundings of coal were simulated with wet sand with 11% moisture content. A 2-cm interlayer of siderite was placed in the horizontal cut of the coal block. As a result of this process, gas with an average flow rate of 12.46 Nm3/h was produced. No direct influence of siderite on the gasification process was observed; however, measurements of CO2 content in the siderite interlayer before and after the process allowed to determine the location of high-temperature zones in the reactor. The greatest influence on the efficiency of the gasification process was exerted by water contained in wet sand. At the high temperature that prevailed in the reactor, this water evaporated and reacted with the incandescent coal, producing hydrogen and carbon monoxide. This reaction contributed to the relatively high calorific value of the resulting process gas, averaging 9.41 MJ/kmol, and to the high energy efficiency of the whole gasification process, which amounted to approximately 70%.

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A study of char gasification in H2O and CO2 mixtures: Role of inherent minerals in the coal

Cited by 65 publications

References 35 publications

Thermodynamic analysis of synergistic coal gasification using blast furnace slag as heat carrier

Thermodynamic analysis of synergistic coal gasification using blast furnace slag as heat carrier

Biomass gasification using the waste heat from high temperature slags in a mixture of CO2 and H2O

An ex Situ Underground Coal Gasification Experiment with a Siderite Interlayer. Course of the Process, Production Gas, Temperatures and Energy Efficiency

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