Key Laboratory of Coal Gasification ECUST

Shanghai, China

Key Laboratory of Coal Gasification ECUST

Shanghai, China
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Zhou J.,Key Laboratory of Coal Gasification ECUST | Chen X.,Key Laboratory of Coal Gasification ECUST | Guo Q.,Key Laboratory of Coal Gasification ECUST | Wang Y.,Key Laboratory of Coal Gasification ECUST
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2010

Based on ASPEN PLUS, the entrained-flow co-gasification of biomass and coal was simulated. The results showed that on the one hand, compared with biomass gasification alone, the co-gasification temperature and efficiency increased, on the other hand, compared with coal gasification alone, the gasification efficiency did not changed greatly when coal was partly replaced by biomass. Though the gasification temperature decreased, the ash fusion point of mixture of biomass and coal also decreased. The gasification result is optimum when the mass fraction of biomass is 20% and the molar ratio of oxygen to carbon is arrange from 1.1 to 1.3. The gasification temperature is above 1250°C; the effective gas productive rate is 1.92 Nm3/kg; the caloric value of syngas is 11.5 MJ/Nm3; the cold gas efficiency is 79.7%.


Guo Q.,Key Laboratory of Coal Gasification ECUST | Chen X.,Key Laboratory of Coal Gasification ECUST | Zhou J.,Key Laboratory of Coal Gasification ECUST | Liu H.,Key Laboratory of Coal Gasification ECUST
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

Four kinds of biomass, reed, straw, bean haulm and pine were ground by shear method, respectively. And with microscope and image processing software Image J, the two-dimensional images of these particles were analyzed. As well as the average aspect ratio of each kind of biomass particles, the difference of average aspect ratios of four kinds of biomass particles was reduced when the particle size decreased. The average aspect ratios of reed, straw, bean haulm and pine particles were 9.82, 9.00, 7.01 and 3.01 in the particle size range of 0.180-0.425 mm, which were different obviously. But when the particle size range was 0.096-0.125 mm, the average aspect ratios of four kinds of biomass particles which were much closed were 2.42, 2.70, 2.59 and 2.49, respectively. It was also found that the shape of the biomass particles could be described by fractal dimension, and the fractal dimension was between 0.8 and 0.9, and the fractal dimensions of biomass particles were reduced when the particle size decreased, in addition, the change of fractal dimension of pine particles was relatively minor.


Gao Y.,Key Laboratory of Coal Gasification ECUST | Dai Z.,Key Laboratory of Coal Gasification ECUST | Li W.,Key Laboratory of Coal Gasification ECUST | Liu H.,Key Laboratory of Coal Gasification ECUST | And 2 more authors.
Journal of Enhanced Heat Transfer | Year: 2011

The problems of over-temperature and tube damage occurred in a vertical reducing helical coiled fire-tube waste heat boiler in the gasification process when the feedstock was changed from residual oil to natural gas. A heat transfer model was employed to investigate the effects of many factors on the performance of the boiler. Numerical simulation was carried out to analyze the temperature and velocity fields in a full-size fire tube used in practical production. The calculation results were compared with the operating conditions. The results of our research show that the fouling resistance in fire tubes is the crucial thermal resistance in heat transfer. Moreover, the fouling resistance has a significant effect on the outlet syngas temperature and little influence on the steam output; increasing inlet syngas temperature will decrease the gas side fouling resistance and lead to lowering the outlet temperature. Results of numerical simulation show that the reason for the tube damage is the superposition of the high temperature, high velocity, and high viscosity of the syngas. This superposition is caused by the effects of the fire-tube structure and the temperature-dependent syngas properties. © 2011.

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