Air gasification of rice husk in a dual distributor type fluidized bed gasifier

Mansaray, K. G.; Ghaly, A. E.; Al‐Taweel, Areej Mohammad; Hamdullahpur, Feridun; Ugursal, V. Ismet

doi:10.1016/s0961-9534(99)00046-x

Cited by 143 publications

(59 citation statements)

References 10 publications

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“…The higher bed temperature resulted in a higher rate of exothermic reactions. This is in line with the observation of Mansary et al [18] who studied the air gasification of rice in a fluidized bed. The information on gas yield and gas quality per unit mass of agricultural wastes is important as it reflects the capability of the agricultural wastes being converted to different products.…”

Section: Resultssupporting

confidence: 92%

Air Gasification of Agricultural Waste in a Fluidized Bed Gasifier: Hydrogen Production Performance

et al. 2009

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Abstract:Recently, hydrogen production from biomass has become an attractive technology for power generation. The main objective pursued in this work is to investigate the hydrogen production potential from agricultural wastes (coconut coir and palm kernel shell) by applying the air gasification technique. An experimental study was conducted using a bench-scale fluidized bed gasifier with 60 mm diameter and 425 mm height. During the experiments, the fuel properties and the effects of operating parameters such as gasification temperatures (700 to 900°C), fluidization ratio (2 to 3.33 m/s), static bed height (10 to 30 mm) and equivalence ratio (0.16 to 0.46) were studied. It was concluded that substantial amounts of hydrogen gas (up to 67 mol%) could be produced utilizing agricultural residues such as coconut and palm kernel shell by applying this fluidization technique. For both samples, the rise of temperature till 900°C favored further hydrocarbon reactions and allowed an increase of almost 67 mol% in the release of hydrogen. However, other parameters such as fluidizing velocity and feed load showed only minor effects on hydrogen yield. In conclusion, agricultural waste can be assumed as an alternative renewable energy source to the fossil fuels, and the environmental pollution originating from the disposal of agricultural residues can be partially reduced.

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Section: Resultssupporting

confidence: 92%

Air Gasification of Agricultural Waste in a Fluidized Bed Gasifier: Hydrogen Production Performance

et al. 2009

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“…6, calculated as in Olivares et al [9] and Cao et al [34] respectively, are comparable to those found by other authors for biomass and sludge [26,34,35]. The cold gas efficieney varies between 17% (at 750 °C (1023 K) and ER0.4) and 51% (at 850 °C (1123 K) and ER 0.2) while carbón conversión varies between 54% (at 750 °C (1023 K) and ER0.2) and 89% (at 850 °C (1123 K) and ER0.4).…”

Section: ¡Nfluence Of Temperature and Equivalence Ratio In Air Gasifisupporting

confidence: 89%

Air-steam gasification of sewage sludge in a bubbling bed reactor: Effect of alumina as a primary catalyst

Andrés

Narros

Rodríguez

2011

Fuel Processing Technology

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ARTICLE INFO ABSTRACT Keywords:Sewage sludge gasification Primary catalyst Bubbling fiuidised bed Gasifying agenteNumerous references can be found in scientific literature regarding biomass gasification. However, there are few works related to sludge gasification. A study of sewage sludge gasification process in a bubbling fiuidised bed gasifier on a laboratory scale is here reported. The aim was to find the optimum conditions for reducing the production of tars and gain more information on the influx of different operating variables in the products resulting from the gasification of this waste. The variables studied were the equivalence ratio (ER), the steambiomass ratio (SB) and temperature. Specifically, the ER was varied from 0.2 to 0.4, the SB from 0 to 1 and the temperature from 750 °C (1023 K) to850 °C (1123 K). Althoughit was observed that tar production could be considerably reduced (up to 72%) by optimising the gasification conditions, the effect of using alumina (aluminium oxide, of proven efficacy in destroying the tar produced in biomass gasification) as primary catalyst in air and air-steam mixture tests was also verified. The results show that by adding small quantities of alumina to the bed (10% by weight of fed sludge) considerable reductions in tar production can be obtained (up to 42%) improving, at the same time, the lower heating valué (LHV) of the gas and carbón conversión.

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“…It was found that the model predicts well the CO 2 concentration at higher ERs and that pertaining to gasification. Mansaray et al (1999) inferred that increasing the ER results in a decrease in concentrations of methane and other light hydrocarbons, which have relatively high heating values. The model results validate the claim that CH 4 concentration decreases with increasing ER.…”

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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-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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Air gasification of rice husk in a dual distributor type fluidized bed gasifier

Cited by 143 publications

References 10 publications

Air Gasification of Agricultural Waste in a Fluidized Bed Gasifier: Hydrogen Production Performance

Air Gasification of Agricultural Waste in a Fluidized Bed Gasifier: Hydrogen Production Performance

Air-steam gasification of sewage sludge in a bubbling bed reactor: Effect of alumina as a primary catalyst

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

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