Study on high temperature gasification kinetics of coal char by TGA and in situ heating stage microscope

Zhang, Xinsha; Ma, Meng; Bai, Yonghui; Song, Xudong; Wang, Jiaofei; Lv, Peng; Yu, Guangsuo

doi:10.1007/s10973-022-11195-w

Cited by 4 publications

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typically, the gas is switched to CO 2 or to a CO 2 -inert gas mixture after the heating to an isothermal temperature. Nearly, all works published in the present journal on CO 2 gasification used this method as illustrated by a selection in the References [21][22][23][24][25]. However, the stabilization of the CO 2 concentration in the furnace needs some time; it may take 20 min or even more [26,27].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the CO2 gasification of woods, torrefied woods, and wood chars. Least squares evaluations by empirical models

Várhegyi

Wang

Skreiberg

2023

J Therm Anal Calorim

View full text Add to dashboard Cite

The gasification kinetics of chars forming from biomass materials was studied by kinetic equations of type dX/dt = Af(X) exp(− E/(RT)) where X is the conversion of the sample, A is the pre-exponential factor, E is the activation energy and f(X) is a suitable model function. The theoretically deduced f(X) models in the literature are rarely applicable for chars of biomass origin because of chemical and physical inhomogeneities and irregularities. Hence, empirical f(X) functions were determined by a method proposed four years ago (Várhegyi in Energy Fuels 33:2348–2358, 2019). The parameters of the models were obtained by the method of least squares. Thermogravimetric experiments from an earlier work were reevaluated to explore the possibilities of the approaches employed. The experiments belonged to untreated birch and spruce woods; torrefied woods; chars prepared at a higher temperature; and chars formed at high heating rates (ca. 1400 °C min−1). Common kinetic features were found for the CO2 gasification of the chars studied. The reliability of the results was carefully tested by evaluating smaller and larger groups of the experiments and comparing the results. The method proved to be suitable for the determination of realistic f(X), E, and A from single modulated experiments, too. The models described well the gasification of chars forming from different woods through a wide range of temperature programs and thermal pretreatments.

show abstract

Section: Introductionmentioning

confidence: 99%

Kinetics of the CO2 gasification of woods, torrefied woods, and wood chars. Least squares evaluations by empirical models

Várhegyi

Wang

Skreiberg

2023

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

Decarbonization kinetics for fluidized roasting of vanadium-bearing carbonaceous shale

Bai

Han

Jin

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

Structural characterization of char during co-gasification from torrefied sludge and Yangchangwan bituminous coal

Zhang,

Bai,

Qin

et al. 2023

Int J Coal Sci Technol

View full text Add to dashboard Cite

The present study aims to investigate the physico-chemical structural evolution characteristics of char structure of CO2 atmosphere torrefaction pretreated sludge with Yangchangwan bituminous coal (YC) during co-gasification. The co-gasification reactivity of torrefied sludge and YC was measured using a thermogravimetric analyzer. The co-gasification reactivity of torrefied sludge with YC was thoroughly explored in depth by in situ heating stage microscope coupled with traditional characterization means of char sample (Scanning electron microscope, nitrogen adsorption analyzer, laser Raman spectroscopy). The results show that the gasification reaction rate of sludge treated under CO2 atmosphere and coal blended char was better than other char samples at 1100–1200 °C. The torrefied sludge under CO2 atmosphere promoted its thermal decomposition to the maximum extent, so that it eventually was transformed into a large number of small broken particles. The specific surface area and ID1/IG ratio of blended char of torrefied sludge under CO2 atmosphere and YC were 1.70 and 1.07 times higher than that of YC, respectively. The in situ technique revealed that YC char with the addition of torrefied sludge undergo gasification by shrinking core modes and the presence of obvious ash melting flow phenomenon. It was more obvious than that of YC.

show abstract

Study on high temperature gasification kinetics of coal char by TGA and in situ heating stage microscope

Cited by 4 publications

References 34 publications

Kinetics of the CO2 gasification of woods, torrefied woods, and wood chars. Least squares evaluations by empirical models

Kinetics of the CO2 gasification of woods, torrefied woods, and wood chars. Least squares evaluations by empirical models

Decarbonization kinetics for fluidized roasting of vanadium-bearing carbonaceous shale

Structural characterization of char during co-gasification from torrefied sludge and Yangchangwan bituminous coal

Contact Info

Product

Resources

About