Non-isothermal coal char gasification with CO 2 in a micro fluidized bed reaction analyzer and a thermogravimetric analyzer

Wang, Fang; Zeng, Xi; Wang, Yonggang; Su, Hui; Yu, Jian; Xu, Guangwen

doi:10.1016/j.fuel.2015.09.084

Cited by 49 publications

(19 citation statements)

References 28 publications

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“…The obtained values of the reaction order n were very similar for all analysed cases. As the heating rate increased, values of both activation energy and preexponential factor decreased, which is consistent with the literature reports [12,13]. The obtained values of R 2 coefficient were very high.…”

Section: Non-isothermal Conditionssupporting

confidence: 91%

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

2019

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The thermogravimetric method allows to carry out measurements both in isothermal conditions for a given temperature and in non-isothermal conditions at a set heating rate. The aim of the work was to compare the process of gasification of the same coal in an atmosphere of CO2 under isothermal and non-isothermal conditions. The measurements were carried out with the use of DynTHERM Thermogravimetric analyzer by Rubotherm. Char derived from Polish bituminous coal “Janina” was used as material for gasification. In case of the isothermal method the measurements were performed at three temperatures – 850 °C, 900 °C and 950 °C, while in case of the non-isothermal method for three heating rates, i.e. 3 K/min, 5 K/min and 10 K/min. Based on the results obtained, kinetics curves of conversion degree of the gasification process were developed and kinetic parameters of the gasification reaction i.e. reaction order, activation energy and pre-exponential factor were determined. The values of the kinetic parameters obtained from measurements performed in isothermal and non-isothermal conditions were compared.

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Section: Non-isothermal Conditionssupporting

confidence: 91%

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

2019

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“…To examine the applicability of MFBRA for the non-isothermal gas−solid reaction, Wang et al 38 conducted a gasification experiment between char with CO 2 at different heating rates. As shown in Figure 12, the results show that the heating rate obviously affected the coal char gasification reaction, especially the representative reaction temperature, such as the initiating reaction temperature (T i ), the temperature with a maximal reaction rate (T m ), and the finishing reaction temperature (T f ).…”

Section: Non-isothermal Characterization Of Mfbramentioning

confidence: 99%

Distinctive Hydrodynamics of a Micro Fluidized Bed and Its Application to Gas–Solid Reaction Analysis

et al. 2017

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The measurement and analysis of reaction behavior, kinetics quantification, and mechanism clarification for gas–solid reactions are essential to the research and development of process technologies in fields of chemical engineering, energy production, mineral processing, etc. By far, different approaches and instruments have been applied for gas–solid reaction analysis and measurement, but a recent development appears distinctive because of its use of a micro fluidized bed (MFB) in implementing the so-called isothermal differential analysis of gas–solid reactions at the Institute of Process Engineering, Chinese Academy of Sciences (CAS). Systematic work has been reported on hydrodynamic studies in MFBs and the standardized development as well as its utilization of the so-called micro fluidized bed reaction analyzer (MFBRA) for investigating various particle-involved reactions, such as pyrolysis, combustion, gasification, reduction, catalysis, absorption, etc. The obtained results well demonstrated the distinctiveness of MFBs from the common large-size fluidized beds and the obvious advantages of the MFBRA for reaction analysis in aspects of rapid heating of the reactant sample, minimization of diffusion limitation to the reaction, real-time online capture of isothermal product formation characteristics, etc. It was shown that MFBRA is particularly capable of analyzing rapid complex reactions and providing some exceptional functions, such as steam atmosphere, online particle sampling, and decoupling of complex reactions in series. A series of applications well verified that the MFBRA provides actually a fundamental approach and the kind of instruments that are complementary to those of thermogravimetric analysis (TGA) for gas–solid reaction measurement and analysis.

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“…In comparison to traditional TGA, a more uniform sample temperature and higher heating rate could be reached under the fluidization state in FB-TGA. Moreover, it can reduce the impact of mass transfer due to gas molecule diffusion and give more accurate kinetic models. − Li et al compared the CO 2 gasification kinetic of a lignite char in a self-designed FB-TGA and a traditional TGA and found that the gasification rate in FB-TGA was much faster in comparison to the traditional TGA. Then, they studied the oxidation kinetics of a manganese ore on the FB-TGA and proposed a dilute-phase transport air reactor design model .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Different Red Muds as Oxygen Carriers in a Fluidized Bed Thermogravimetric Analyzer

et al. 2021

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The developed fluidized bed thermogravimetric analyzer (FB-TGA) brings meaningful scientific contribution to the materials engineering on the basis of full achievement of the fluidized bed advantages in a micro scale. Red mud (RM), as a byproduct of the alumina industry, contains active Fe 2 O 3 , a high content of Na, as well as some inert Al 2 O 3 and SiO 2 . In this work, three kinds of different red mud (LSRM, XFRM, and LBRM) were used as oxygen carriers, and the chemical looping combustion (CLC) characteristics were evaluated in an FB-TGA using H 2 as the reactant, with the objective of exploring the interaction behavior of these constant elements and further detecting the influence on the reactivity and stability of the red muds. The multiple redox cycle performance of different red muds, based on the attrition rate, oxygen carrier conversion, reaction rate, and oxygen transfer capacity in each cycle, was investigated. Various red muds demonstrate different reaction behaviors during multiple redox cycles. The LBRM sample possesses the best attrition resistance in comparison to the other red muds and experiences an activation process with its rate index increasing with the cycles and stabilizing at 1.6800%/s after 80 cycles. During the CLC process, for the Ca-rich red mud, the Ca element tends to act as a support in the form of Ca 2 Al 2 SiO 7 , while the Na element exists in the form of NaAlSiO 4 for all the red mud samples. Ca 2 Al 2 SiO 7 and NaAlSiO 4 are stable materials with a high melting point and act as inert supports to sustain the chemical reactivity of the red-mudbased oxygen carriers.

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Non-isothermal coal char gasification with CO 2 in a micro fluidized bed reaction analyzer and a thermogravimetric analyzer

Cited by 49 publications

References 28 publications

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

Distinctive Hydrodynamics of a Micro Fluidized Bed and Its Application to Gas–Solid Reaction Analysis

Evaluation of Different Red Muds as Oxygen Carriers in a Fluidized Bed Thermogravimetric Analyzer

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Non-isothermal coal char gasification with CO 2 in a micro fluidized bed reaction analyzer and a thermogravimetric analyzer

Cited by 49 publications

References 28 publications

Comparison of CO2 gasification of coal in isothermal and non-isothermal conditions

Comparison of CO2 gasification of coal in isothermal and non-isothermal conditions

Distinctive Hydrodynamics of a Micro Fluidized Bed and Its Application to Gas–Solid Reaction Analysis

Evaluation of Different Red Muds as Oxygen Carriers in a Fluidized Bed Thermogravimetric Analyzer

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Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions