Experimental and modeling studies in fixed-bed char gasification

Bhattacharya, Amitava; Salam, L.; Duduković, Milorad P.; Joseph, Babu

doi:10.1021/i200035a025

Cited by 22 publications

(8 citation statements)

References 3 publications

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“…Biba et al [8] Yoon et al [13] Amundson and Arri [16] Bhattacharya et al [6] Caram and Fuentes [27] Adanez and Labiano [28] Present work…”

Section: Parametersmentioning

confidence: 91%

“…The temperature profile measured inside the gasifier was compared with the numerical predicted data. Bhattacharya et al [6] presented a moving bed gasifier model and compared the predicted results against those of a bench scale reactor. They considered shrinking core model for particle reaction and equilibrium at each height for shift reaction.…”

Section: 41mentioning

confidence: 99%

“…The differential equations (2)(3)(4)(5)(6)(7)(8) are solved using an inhouse FORTRAN code using fourth-order Runge-Kutta method. Initial temperatures of coal, gas and steam are set based on the input data.…”

Section: Solution Proceduresmentioning

confidence: 99%

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Mathematical modeling of gasification of high-ash Indian coals in moving bed gasification system

Singh

Raghavan

Sundararajan

2013

Int. J. Energy Res.

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SUMMARY Simulation of gasification of high‐ash Indian coal in an updraft moving bed gasification system is presented in this paper. A steady one‐dimensional numerical model, which takes into account of drying, devolatilization, combustion and gasification processes, is used to solve the mass and energy balances in the gasification system. The results from the model have been validated against the experimental data available in literature for various types of coals. The predicted product gas composition, its calorific value and the exit temperature are in agreement with the reported results. The validated model is used to study the effect of input parameters such as oxygen content in air stream, steam flow rates and the pressure of the gasification system. Results indicate that the value of oxygen mole fraction around 0.42 in the oxidizer stream can provide optimum performance in oxygen‐based gasification systems. There is a range of steam‐to‐coal ratio that is dependent on the oxygen content in oxidizer stream. For air‐based systems, this value is around 0.4 and for oxygen‐based systems it is 1.5. The gasification performance improves with operating pressure significantly. An operating pressure of around 8 bar and higher, based on the application, can be used for achieving the required performance with high‐ash coals. The model is useful for predicting the performance of high‐ash Indian coals in a moving bed gasification system under different operating parameters. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Biba et al [8] Yoon et al [13] Amundson and Arri [16] Bhattacharya et al [6] Caram and Fuentes [27] Adanez and Labiano [28] Present work…”

Section: Parametersmentioning

confidence: 91%

Section: 41mentioning

confidence: 99%

See 1 more Smart Citation

Mathematical modeling of gasification of high-ash Indian coals in moving bed gasification system

Singh

Raghavan

Sundararajan

2013

Int. J. Energy Res.

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“…As part of research and development, many researchers have reported their results on temperature profiles, product gas composition, reaction zone propagation rates etc., in the gasifier bed for different types of biomass. Bhattacharya et al (1986) experimentally analyzed coal char gasification in a bench-scale, throat-less, cylindrical reactor and obtained temperature profile along the gasifier axis. Khater et al (1992) studied the gasification of rice hulls in a throat-less, downdraft gasifier and measured the bed temperatures at five locations along the gasifier axis.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the changes in bed properties of a downdraft biomass gasifier

Kumararaja¹,

Reddy²,

Ramanan³

et al. 2011

Int. J. Eng. Sci. Tech

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Biomass gasifiers of fixed bed, downdraft type are generally used for driving internal combustion engines. As part of research work, a versatile, throat type, biomass gasifier was developed. The gasifier had facilities for bed temperature measurements, pressure measurements, physical observation, sampling of bed particles, bed agitation, etc. The generated producer gas was cleaned and cooled in downstream components namely, cyclone separator, dust filter and gas cooler such that water had no direct contact with producer gas. The dry cleaned producer gas was flared directly at the exit pipe. Bed temperatures and bed char properties viz., weight, volume, density and volatile matter content along the gasifier axis, wood feeding rate, gasification air and producer gas flow rates, etc. were observed and analyzed during the gasification of wood pieces. Temperature stratification was found to depend on biomass bed height, phase of operation, location of reaction zones and reactor pressure. Specific gasification rate for wood pieces was found to be 75 kg h -1 m -2 which was lesser than that for loose bioresidues. Mass balance was also done for the gasification system. The producer gas to wood ratio was determined to be 2.39 at an optimum equivalence ratio of 0.3. The volume of wood piece or char decreased by as high as 86% even before it enters the reduction zone of the gasifier.

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“…Yu et al (1983) extended Yoon's model to two space dimensions. More recent models include the one-dimensional, steady-state model of Earl and Islam (1985) and the two-dimensional, transient models of Thorsness and Kang (1986) and Bhattacharya et al (1986). Khanna and Seinfeld (1987) discussed recent advances in catalytic fixed-bed reactor models which have many of the features of coal gasification/combustion fixed-bed models discussed earlier.…”

Section: Introductionmentioning

confidence: 99%