Numerical simulation and optimum operational point determination of a downdraft gasfier regarding pollutant emissions

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BAHARI ALI; ATASHKARI KAZEM; MAHMOUDIMEHR JAVAD

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:6 Page(s): 69-78

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Title

Numerical simulation and optimum operational point determination of a downdraft gasfier regarding pollutant emissions

Author(s)

BAHARI ALI | ATASHKARI KAZEM | MAHMOUDIMEHR JAVAD | Issue Writer Certificate

Keywords

GasificationQ2

Syngas productionQ1

Downdraft gasifierQ1

Numerical simulationQ2

Abstract

The use of biomass by means of Gasification to produce bio fuels and reducing the environmental impact of fossil fuels has been the focus of many researchers in recent years. In the present study, the computational fluid dynamics method is used to predict the process of Gasification inside a Downdraft gasifier. Recent studies have shown that although many studies have been carried out by various researchers to maximize the cold gas efficiency in the Gasification process, so far, no study has been done to minimize the emission of pollutants as one of the other important design parameters along with the increase of cold gas efficiency. So, in this study, the effect of changing the equivalence ratio as design variable on the Gasification efficiency as well as the amount of pollutant produced simultaneously is investigated. Also, in this study, CO/CO2 and H2 /H2O molar ratios are considered as another objective function in selecting the optimal process point. In order to verify the validity of the results, the simulation data was compared with the experimental results and the previous numerical study, and a good agreement was shown between their comparison. The results of this study show that in the ratio of 0. 64, the rate of production of nitrogen oxides relative to cold gas efficiency is optimal considering the maximum production of CO/CO2 and H2/H2O molar ratios. This point is the optimal point. Under the working conditions of the Gasification process.

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APA: Copy

BAHARI, ALI, ATASHKARI, KAZEM, & MAHMOUDIMEHR, JAVAD. (2018). Numerical simulation and optimum operational point determination of a downdraft gasfier regarding pollutant emissions. MODARES MECHANICAL ENGINEERING, 18(6 ), 69-78. SID. https://sid.ir/paper/178102/en

Vancouver: Copy

BAHARI ALI, ATASHKARI KAZEM, MAHMOUDIMEHR JAVAD. Numerical simulation and optimum operational point determination of a downdraft gasfier regarding pollutant emissions. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(6 ):69-78. Available from: https://sid.ir/paper/178102/en

IEEE: Copy

ALI BAHARI, KAZEM ATASHKARI, and JAVAD MAHMOUDIMEHR, “Numerical simulation and optimum operational point determination of a downdraft gasfier regarding pollutant emissions,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 6 , pp. 69–78, 2018, [Online]. Available: https://sid.ir/paper/178102/en

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