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Wang X.,Key Laboratory of Coal Gasification | Wang X.,East China University of Science and Technology | Chen F.,Key Laboratory of Coal Gasification | Hong B.,Key Laboratory of Coal Gasification | And 3 more authors.
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2013

Potassium-catalyzed steam gasification of Hohhot coal for H2 production was performed using a laboratory fixed-bed reaction system with an on-line cubic micro flow infrared gas analyzer. The gasification reactivity, gasification selectivity, and gas release for the catalytic gasification were investigated and compared with the non-catalytic gasification. The amounts of gases released in the heat-up stage were insignificant for catalyzed gasification, compared to those released in the gasification stage. The potassium hydroxide catalyst could not only effectively promote gasification reactivity, but also enhance greatly H2 production. In the case of catalytic gasification, the steam partial pressure had an effect on the gasification reactivity, suggesting that there existed in an optimum steam partial pressure (about 50%) for H2 production from the potassium-catalyzed steam gasification of the Hohhot coal. In addition, Hohhot coal could be feasibly utilized as the feedstock for the catalytic steam gasification to produce gases with high H2 (60.9-65.2%). © 2013 Taylor & Francis Group, LLC. Source


Gao Y.,North China University of Water Conservancy and Electric Power | Dai Z.,Key Laboratory of Coal Gasification | Li C.,Key Laboratory of Coal Gasification | Wang F.,Key Laboratory of Coal Gasification
Asia-Pacific Journal of Chemical Engineering | Year: 2013

Soot nanoparticles play a key role in heat transfer. A single-phase model is proposed to study effects of soot nanoparticles on heat transfer in a fire-tube waste heat boiler used in the process of bitumen gasification. In this model, the syngas containing a large amount of soot nanoparticles is treated as soot nanofluid. The model is applied in the numerical simulation of heat transfer in a fire tube in the waste heat boiler. Results show that soot nanoparticles enhance heat transfer not only by heat radiation mainly but also by the effects of microscale of soot nanoparticles especially at high temperature. Smaller sizes or larger quantities of soot nanoparticles can intensify heat transfer of the soot nanofluid. It is also indicated that structures of fire tubes affect the temperature and velocity fields significantly. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd. Source


Wang F.-f.,East China University of Science and Technology | Wang F.-f.,Key Laboratory of Coal Gasification | Zhang D.-x.,East China University of Science and Technology | Zhang D.-x.,Key Laboratory of Coal Gasification | And 6 more authors.
Fuel | Year: 2010

Thermogravimetry at constant temperature and programmed temperatures is used to study reaction kinetics and possible mechanism of COS desulfurization using ferric oxide as the main active component. The apparent reaction activation energy is smaller in hydrogen atmosphere than in nitrogen. The desulfurization reaction of COS takes place easily in a hydrogen atmosphere. At the same time, the influence of the reducing temperature on the desulfurizing reaction was also studied in the TGA apparatus and was shown to play an important part for ferric desulfurization. The optimum temperature for the reducing reaction is under 360 °C. The kinetics of the COS removal reaction are approximately first-order. When the reaction gas contains hydrogen, the apparent reaction activation energy is 12.36 kJ mol-1, in contrast to 21.92 kJ mol-1 in the absence of hydrogen. Crown Copyright © 2009. Source


Sun Y.,Key Laboratory of Coal Gasification | Wang X.,Key Laboratory of Coal Gasification | Dai Z.,Key Laboratory of Coal Gasification | Yu G.,Key Laboratory of Coal Gasification | Wang F.,Key Laboratory of Coal Gasification
30th Annual International Pittsburgh Coal Conference 2013, PCC 2013 | Year: 2013

A novel coal conversion process was proposed: the method combined the high efficiency of extraction of coals with CS2/ NMP and the high diffusibility, separation and environmental friendliness of supercritical carbon dioxide (SCCO2) extraction. Coal samples of 10 g were exhaustively extracted with SCCO2/NMP mixed solvent (1:1 by volume) in a high-pressure vessel made of stainless steel with internal volume of 1 liter and inner diameter of 87.8 mm. Physical and chemical properties of the liquid products in the extraction of coals with SCCO2/NMP mixed solvent were studied in this paper. The analysis of the low molecular weight compounds in the liquid products by GC-MS shows that the main types of the low molecular weight compounds in the liquid products are aromatic compounds and alkanes. Increases in temperature and pressure enhance types and alkanes' ratio in low rank coal's extract. Pressure plays less important role in the types of bituminous coals' extract. But enhancement in temperature increases the ratio of alkanes. Functional group and crystallite size of extracts was analyzed. Result shows that mixed solvent have strong selectivity for hydroxy rich matter and oxygen-containing substance such as grease, phenols, and ketones. With the addition of SCCO2, the extraction of hydroxy rich matter is enhanced while the aliphatic matter in extracts decreases. Crystallite structure in extracts is found similar with raw coals, but their graphitization degrees are lower. Source


Wang X.,East China University of Science and Technology | Wang X.,Key Laboratory of Coal Gasification | Chen J.,East China University of Science and Technology | Chen J.,Key Laboratory of Coal Gasification | And 6 more authors.
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2013

The effects of temperature on the steam gasification of the Hohhot coal and saturated addition of KOH catalyst were investigated by thermo gravimetric-differential scanning calorimetry equipment. It was found that K showed an obvious catalytic activity on gasification, and decreased the steam gasification temperature for 100°C, and the saturated addition of K catalysts was about 10% for the Hohhot coal steam gasification. A homogeneous phase model, shrinking core model, and integrated model were applied to correlate the data of conversion with time and to estimate the reaction rate constants under different temperatures. The results of simulation showed that the integrated model was best suitable for the TR and the TD steam gasification process, and the shrinking core model was best suitable for the gasification processes of TR-10K and TD-10K. The integrated model was used for solving kinetics parameters of the TR and the TD steam gasification, and the shrinking core model was used for the TD-10K. It was found that the E is 55.06 kJ·mol-1 for the TD-10K, 132.19 kJ·mol-1 for the TR, and 144.38 kJ·mol-1 for the TD. Copyright © Taylor & Francis Group, LLC. Source

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