Papers by Author: Hong Qin

Abstract: Taking the physical model of a small oil-shale retorting furnace with gas heat carrier as research object, a quasi homogeneous mathematical model was established to simulate the process of heating the pebbles in the porous zone and was solved by Fluent, a commercial CFD software. We compared the calculated results of temperature with the measured data, and analyzes the cause of the deviation between them.The result showed that the calculated value is relatively close to the measured data(the relative error is 6.85%) and the model can predict accurately the actual temperature field. The research results can provide support for the process of structural design of the large oil-shale retorting furnace with gas heat carrier.

Abstract: Huadian oil shale and its spent char were selected to explore the adsorption properties of oil shale and oil shale char. A bench-scale adsorption system was established for capturing hydrogen sulfide in this test. What’s more, the nitrogen adsorption isotherms test was made in automatic and rapid specific surface-area-analyzer of American’s Gemini2380, which found the adsorption curve and desorption loop of the modified oil shale and oil shale char. Meanwhile, the experiment calculated and analyzed the specific surface area and pore size distribution of samples with BJH theory. The result shows that the adsorption capacity of oil shale char is greater than oil shale. The rougher the pore structure of the adsorbent samples the greater the pore volume, the larger the specific surface area, the better the adsorption effect of H2S.

Abstract: The ash of Huadian oil shale is made to remove H₂S in this experiment. XRD and nitrogen adsorption experiments are used to analyze the physical and chemical properties of the ash, the results show that the ash of oil shale has many metal and nonmetal oxides, and also has much microporous and mesoporous, all above is helpful to remove H₂S. The sample is modified by different ways to see the change of adsorption capacity. the sample which is modified by alkali and sprinkler is the best adsorbent, but the sample which is modified by microwave does not increase the removal ability obviously.

Abstract: Activated carbon was modified by urea, potassium hydroxide and potassium respectively. The porosity of the samples properties was analyzed by nitrogen adsorption. Then it was used as adsorbent to catalyze and absorbed H2S from the gas based on dry distillation. The experiments in this paper were carried to study the effects including H2S concentration, impregnating solutions on adsorption of H2S on the modified activated carbon. The results showed that the adsorption capacity of the modified activated carbon was relevant with the kinds of pickling liquid and experimental conditions, On the whole, The lower was concentration of H2S, the higher would adsorption capacity of modified activated carbon be. At the same time the experiments also analyzed the samples of surface oxidation products through thermogravimetric analysis.

Abstract: Sulfur release was studied during the retorting of oil shale in a bench-scale reactor. H₂S and COS were measured in retorting gas and sulfur element was determined in the semi-coke. Wangqing oil shale was selected as a sample in the tests. The results show that both two main factors affect the sulfur release during the samples distillation between 300°C and 600°C. The H₂S releases below 550 °C, while COS escapes mainly in two stages of 300°C-450°C and 500 °C -600 °C.