Gasification rate analysis of coal char with a pressurized drop tube furnace

Kajitani, Shiro; Hará, Saburo; Matsuda, Hiromitsu

doi:10.1016/s0016-2361(01)00149-1

Cited by 305 publications

(173 citation statements)

References 9 publications

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“…Kajitani et al [44] also described the gasification reaction of coal chars using the random pore model. Okumura et al [45] found that the random pore model was more appropriate than the volume reaction model for describing the gasification reaction of biomass char.…”

Section: Kinetic Parametersmentioning

confidence: 99%

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

121

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The non-isothermal thermogravimetric method (TGA) was applied to a bituminous coal (PT), two types of biomass, chestnut residues (CH) and olive stones (OS), and coalbiomass blends in order to investigate their thermal reactivity under steam. Fuel chars were obtained by pyrolysis in a fixed-bed reactor at a final temperature of 1373 K for 30 min. The gasification tests were carried out by thermogravimetric analysis from room temperature to 1373 K at heating rates of 5, 10 and 15 K min -1 . After blending, no significant interactions were detected between PT and CH during co-gasification, whereas deviations from the additive behaviour were observed in the PT-OS blend.However, for the two coal-biomass blends, the gasification behaviour resembled that of the individual coal, as this component constituted the larger proportion of the blend. The temperature-programmed reaction (TPR) technique was employed at three different heating rates to analyze noncatalytic gas-solid reactions. Three nth-order representative gas-solid models, the volumetric model (VM), the grain model (GM) and the random pore model (RPM) were applied in order to describe the reactive behaviour of the chars during steam gasification. From these models, the kinetic parameters were determined.The best model for describing the reactivity of the PT, PT-CH and PT-OS samples was the RPM model. VM was the model that best fitted the CH sample, whereas none of the models was suitable for the OS sample.

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Section: Kinetic Parametersmentioning

confidence: 99%

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

121

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“…It have been mentioned that the rate constant K in the above discussed models would become the initial gasification rate dX/dt when char conversion X = 0. Nevertheless, it was reported that the switch of gas results for dX/dt (X = 0) obtained from the TGA is not accurate (Kajitani, Hara & Matsuda, 2002;Yuan et al, 2011;. Consequently, in this study, the gasification rate at char conversion of 0.5 (r 0.5 ) was taken as the basis and the lnr 0.5 versus 1/ (R·T) is plotted in Figure 5.…”

Section: Kinetic Analyses Of Co 2 Gasification Of Weee Plastic Charsmentioning

confidence: 99%

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

H¹

2015

EER

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The isothermal CO 2 gasification characteristics of three chars derived from medium temperature pyrolysis of waste electrical and electronic equipment (WEEE) plastics were studied by using a thermogravimetric analyzer (TGA) within the temperature range of 850−1050°C. Phenolic board (PB), brominated high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) plastics are widely used for the electric and electronic equipment and were employed as model WEEE plastics for the char sample production in this study. The effects of their physicochemical properties and gasification temperature on the WEEE plastic chars conversion rate, the reactivity indexes and the gasification rate were investigated in detail. The random pore model (RPM), the extended random pore model (eRPM) and the shifted extended random pore model (s-eRPM) have been employed to fit the CO 2 gasification rate curve of WEEE plastic chars, respectively. The kinetic parameters and the correlation coefficients (R 2 ) were evaluated by RPM, eRPM and s-eRPM, respectively. It was found that the CO 2 gasification reactivity of PB char was the highest, followed by that of HIPS char and the gasification reactivity of ABS char was the lowest, which have a close relationship with their pore and carbon crystal structure properties. In addition, it was found that RMP could fit the gasification reaction rate of HIPS char well whose maximum reaction rate appeared at the char conversion of approximate 0.4. Nevertheless, as for PB char and ABS char, their maximum gasification rate presented at char conversion of around 0.8 and 0.2, respectively. And it was observed that eRMP and s-eRPM could predict their gasification rate of PB char and ABS char very well with higher R 2 , respectively.

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“…Kajitani 등은 반응가스 부분압력이 증가할수록 반응속도는 비례 적으로 증가하며 높은 온도에서 부분압력의 영향이 증가한다는 결 과를 얻었으며 전체압력 0.2~2.0 MPa 범위에서는 압력의 영향은 미미하다고 언급하였다 [2]. Schmal 등은 전체압력이 낮은 영역에서 는 압력이 증가할수록 반응속도가 크게 증가하지만 1 MPa 이상에 서는 영향이 매우 작다고 하였다 [6].…”

Section: 서 론unclassified

The Effect of Coal Particle Size on Char-CO₂Gasification Reactivity by Gas Analysis

김용택¹,

Hwang²,

서동균³

2011

Korean Chemical Engineering Research

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− Char gasification is affected by operating conditions such as reaction temperature, reactants gas partial pressure, total system pressure and particle size in addition to chemical composition and physical structure of char. The aim of the present work was to characterize the effect of coal particle size on CO 2 gasification of chars prepared from two different types of bituminous coals at different reaction temperatures(1,000~1,400 o C). Lab scale experiments were carried out at atmospheric pressure in a fixed reactor where heat was supplied into a sample of char particles. When a flow of CO 2 (40 vol%) was delivered into the reactor, the char reacted with CO 2 and was transformed into CO. Carbon conversion of the char was measured using a real time gas analyzer having NDIR CO/CO 2 sensor. The results showed that the gasification reactivity increased as the particle size decreased for a given temperature. The sensitivity of the reactivity to particle size became higher as the temperature increases. The size effects became remarkably prominent at higher temperatures and became a little prominent for lower reactivity coal. The particle size and coal type also affected reaction models. The shrinking core model described better for lower reactivity coal, whereas the volume reaction model described better for higher reactivity coal.

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Gasification rate analysis of coal char with a pressurized drop tube furnace

Cited by 305 publications

References 9 publications

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

The Effect of Coal Particle Size on Char-CO₂Gasification Reactivity by Gas Analysis

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Gasification rate analysis of coal char with a pressurized drop tube furnace

Cited by 305 publications

References 9 publications

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

The Effect of Coal Particle Size on Char-CO2Gasification Reactivity by Gas Analysis

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Product

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The Effect of Coal Particle Size on Char-CO₂Gasification Reactivity by Gas Analysis