An equilibrium model for biomass gasification processes

Ruggiero, Marco; Manfrida, Giampaolo

doi:10.1016/s0960-1481(98)00429-7

Cited by 102 publications

(50 citation statements)

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“…The model predicts unreasonably high H 2 at lower ERs. Ruggiero and Manfrida (1999) described the irrelevance of equilibrium models, which assume perfect gas behavior for very low ERs as these models cannot describe pyrolysis processes due to the presence of liquid hydrocarbons as pyrolysis products. Desrosiers (1981) …”

Section: A) Effect Of Er On Hydrogen and Comentioning

confidence: 99%

“…The modeled results for charred CNS indicated negative values of CO 2 at lower ERs, which is quite unrealistic. Ruggiero and Manfrida's (1999) statement could be applied to this condition also. However, after a critical analysis of the modeling, it was decided to check the trend of CO 2 for other established fuels, for which modeling results had already been reported.…”

Section: B) Effect Of Er On Co 2 and Chmentioning

confidence: 99%

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Performance prediction and validation of equilibrium modeling for gasification of cashew nut shell char

Ramanan

Elango

Sethumadhavan

et al. 2008

Braz. J. Chem. Eng.

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-Cashew nut shell, a waste product obtained during deshelling of cashew kernels, had in the past been deemed unfit as a fuel for gasification owing to its high occluded oil content. The oil, a source of natural phenol, oozes upon gasification, thereby clogging the gasifier throat, downstream equipment and associated utilities with oil, resulting in ineffective gasification and premature failure of utilities due to its corrosive characteristics. To overcome this drawback, the cashew shells were de-oiled by charring in closed chambers and were subsequently gasified in an autothermal downdraft gasifier. Equilibrium modeling was carried out to predict the producer gas composition under varying performance influencing parameters, viz., equivalence ratio (ER), reaction temperature (RT) and moisture content (MC). The results were compared with the experimental output and are presented in this paper. The model is quite satisfactory with the experimental outcome at the ER applicable to gasification systems, i.e., 0.15 to 0.30. The results show that the mole fraction of (i) H 2 , CO and CH 4 decreases while (N 2 + H 2 O) and CO 2 increases with ER, (ii) H 2 and CO increases while CH 4 , (N 2 + H 2 O) and CO 2 decreases with reaction temperature, (iii) H 2 , CH 4 , CO 2 and (N 2 + H 2 O) increases while CO decreases with moisture content. However at an equivalence ratio less than 0.15, the model predicts an unrealistic composition and is observed to be non valid below this ER.

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Section: A) Effect Of Er On Hydrogen and Comentioning

confidence: 99%

Section: B) Effect Of Er On Co 2 and Chmentioning

confidence: 99%

Performance prediction and validation of equilibrium modeling for gasification of cashew nut shell char

Ramanan

Elango

Sethumadhavan

et al. 2008

Braz. J. Chem. Eng.

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show abstract

“…In a gas composition where the volume percent of CO, CO2, Ar and H2 is 11, 32, 5, and 52 %, respectively, comparable to bio-derived synthesis gas 52 , it is also found that Fe/Cu/Al/K catalysts have significantly higher activity than the silica containing catalysts 53 . The difference in activity under such conditions seems to arise from a higher resistance towards oxidation and higher stability of the carbide phases with alumina as structural promoter 38,53 .…”

Section: Effect Of Co2 With Different Mechanical Promotersmentioning

confidence: 77%

Fischer‒Tropsch Conversion of Biomass‐Derived Synthesis Gas to Liquid Fuels

Lillebø¹,

Holmén²,

Enger³

et al. 2015

Advances in Bioenergy

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“…The approach is reported in literature as satisfactory and it was previously used by other authors (Schuster et al [20], Baggio et al [23], Ruggiero et al [30]). An in-house Fortran code was written to perform the calculation.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 82%

Integrated biomass gasification combined cycle distributed generation plant with reciprocating gas engine and ORC

Kalina

2011

Applied Thermal Engineering

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The paper theoretically investigates the performance of a distributed generation plant made up of gasifier, Internal Combustion Engine (ICE) and Organic Rankine Cycle (ORC) machine as a bottoming unit. The system can be used for maximization of electricity production from biomass in the case where there is no heat demand for cogeneration plant. To analyze the performance of the gasifier a model based on the thermodynamic equilibrium approach is used. Performance of the gas engine is estimated on the basis of the analysis of its theoretical thermodynamic cycle. Three different setups of the plant are being examined. In the first one the ORC module is driven only by heat recovered from engine exhaust gas and cooling water.Waste heat from a gasifier is used for gasification air preheating. In the second configuration a thermal oil circuit is applied. The oil transfers heat from engine and raw gas cooler into the ORC. In the third configuration it is proposed to apply a double cascade arrangement of the ORC unit with a two stage low temperature evaporation of working fluid. This novel approach allows utilization of the total waste heat from the low temperature engine cooling circuit. Two gas engines of different characteristics are taken into account. The results obtained were compared in terms of electric energy generation efficiency of the system. The lowest obtained value of the efficiency was 23.6% while the highest one was 28.3%. These are very favorable values in comparison with other existing small and medium scale biomass fuelled power generation plants.

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An equilibrium model for biomass gasification processes

Cited by 102 publications

References 1 publication

Performance prediction and validation of equilibrium modeling for gasification of cashew nut shell char

Performance prediction and validation of equilibrium modeling for gasification of cashew nut shell char

Fischer‒Tropsch Conversion of Biomass‐Derived Synthesis Gas to Liquid Fuels

Integrated biomass gasification combined cycle distributed generation plant with reciprocating gas engine and ORC

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