Time filter

Source Type

Pan L.-Y.,Shandong University of Science and Technology | Chen L.-Q.,Shandong University of Science and Technology | Zhang R.-X.,Shandong Energy Longkou Mining Group Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

For the geological conditions of two soft coal seams, mechanical models for rockburst occurring in two soft coal seams. Mechanical analysis and field practice of these models show that the main causes for rockburst in deep two soft coal seams are the stress concentration and energy accumulation in the soft alluvium that is clamped in the upper force source layer and the lower stable layer, and the energy accumulated from mining activities which releases to crushing mitigation areas, causing instantaneous ejection of coal and rock blocks and forming the rock burst. Through the researches on stress, energy, material conditions and inducing factors for burst of deep two soft coal seams, the prevention measures for rockburst of block structure of the roof support structure such as transferring stress, maintaining the stability of chain pillars, strengthening coal side, and loosening working slope are formulated. Field practice is made so as to realize the safe and high-efficiency non-impact mining at working faces. ©, 2015, Chinese Society of Civil Engineering. All right reserved.


Shi Y.,Dalian University of Technology | Li S.,China University of Petroleum - Beijing | Ma Y.,China University of Petroleum - Beijing | Yue C.,China University of Petroleum - Beijing | And 3 more authors.
Oil Shale | Year: 2012

In this paper, the basic principle and features of the process carried out in a Sanjiang(SJ)-type rectangular pilot-scale retort have been described. The suitability of the SJ retort for processing oil shale from Yaojie (YJ) county, Gansu province, China was investigated to find optimal conditions for an effective recovery of shale oil. The pyrolysis of lump YJ oil shale was carried out in the SJ pilot retort with a daily processing capacity of 24 tons of oil shale. It was found that the heat value of the pyrolysis gas produced from YJ oil shale was sufficient to provide the heat needed for retorting. The pyrolysis temperature fluctuated between 550 and 700 °C, with an average of 610 °C. The results of the study demonstrate that the shale oil yield from YJ oil shale is high, accounting for about 85% vs. Fisher assay. The shale oil consists mainly of diesel and heavy fractions, and the spent shale is of high calorific value. © 2012 Estonian Academy Publishers.


Tang X.,China University of Petroleum - Beijing | Tang X.,Beijing Guodian Longyuan Environmental Engineering Co. | Li S.,China University of Petroleum - Beijing | Yue C.,China University of Petroleum - Beijing | And 5 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

Four kinds of hydrodenitrogenation (HDN) lumping kinetic models for shale oil were proposed and compared with each other in the prediction capability for nitrogen contents of hydrotreated oil samples. The nitrogen compounds in the feedstock were lumped into two, three, four or five portions, respectively, in terms of the different reactivity and reaction rate of HDN reaction. The influences of hydrogen pressure, LHSV, hydrogen-oil ratio and the nitrogen compounds inhibition effects on HDN were considered in the models. The kinetic parameters were obtained on the basis of data from sixty experiments. The optimal model was selected after comparing the fitting and prediction effects of the models, and applied to predict the most reasonable conditions for shale oil hydrodenitrogenation. The results showed that all the five kinetic models were reasonable with the correlation coefficients greater than 0.9983 and mean-square errors less than 1.9.Among the five models, the five-lump kinetic model had the best fitting effect, and could better describe the HDN reactions in shale oil. The relative errors between predicted and experimental data were less than 5%. The optimal conditions for Longkou shale oil HDN predicted by the five-lump model were the reaction temperature of 693.15 K, reaction pressure of 9 MPa, LHSV of 0.5 h-1, under which the predicted data were similar to the experimental results. © 2015, Editorial Office of Acta Petrolei Sinica. All right reserved.


Geng C.,China University of Petroleum - Beijing | Li S.,China University of Petroleum - Beijing | Ma Y.,China University of Petroleum - Beijing | Yue C.,Shandong Energy Longkou Mining Group Co. | And 2 more authors.
Oil Shale | Year: 2012

Methods of acid-base separation and extrography were used to decompose shale oil of Longkou oil shale (LSO), Shandong province, and coal tar of Shenmu coal (SCT), Shanxi province, both China, into acid, base and neutral fractions. The molecular structure and mass distribution of the oxygen compounds present in LSO and SCT were investigated using gas chromatography-mass spectrometry (GC-MS) and negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS). The results of GC-MS showed that oxygen compounds in the acid fractions of LSO and SCT were phenols, indanols, naphthols, phenylphenols, fluorenols and phenanthrenols, and their derivatives, while oxygen compounds in neutral fractions 4 and 5 were aliphatic ketones, esters and minor aromatic ketones. The results of ESI FT-ICR MS demonstrated that in LSO, O1, O2, O3, N1O1, N1O2, N1and N2 compounds were determined with O1 and O2 compounds as the most abundant. SCT contained O1, O2, O3, O4, O5 and O6 compounds, while O2 and O3 compounds dominated. © 2012 Estonian Academy Publishers.


Wang W.,China University of Petroleum - Beijing | Ma Y.,China University of Petroleum - Beijing | Li S.,China University of Petroleum - Beijing | Shi J.,China University of Petroleum - Beijing | Teng J.,Shandong Energy Longkou Mining Group Co.
Energy and Fuels | Year: 2016

The reaction involving radical species is a key factor during the pyrolysis process used to form hydrocarbons. In this study, electron paramagnetic resonance (EPR) spectroscopy was used to characterize the properties of free radicals in the pyrolysates of oil shale. Effects of temperature on the yields and the EPR properties of thermal bitumen, shale oil, and semicoke were investigated, with the aim to understand the behavior of free radicals during the oil shale pyrolysis process. This study shows that the free radical concentrations (Ng) of shale oil and semicoke become higher with increasing temperature. The yield and Ng of thermal bitumen as an intermediate product follow the similar trends in the whole temperature range, first increasing and then decreasing. This is attributed to the competing mechnism of thermal bitumen generation and decomposition. The Ng of shale oil is lower than those of semicoke and thermal bitumen due to the coupling reaction of free radicals before the volatiles being condensed. The g-values and linewidths of thermal bitumen, shale oil, and semicoke are also affected by temperature, revealing the changing chemical structure and the surrounding environment of free radicals during the pyrolysis process. © 2016 American Chemical Society.


Hou J.,China University of Petroleum - Beijing | Li S.,China University of Petroleum - Beijing | Ma Y.,China University of Petroleum - Beijing | Geng C.,China University of Petroleum - Beijing | And 3 more authors.
Energy and Fuels | Year: 2016

In this paper, with 1000 kg of oil shale for research, the heat and material balance of Myanmar oil shale processing by Sanjiang gas combustion rectangular retort (SJ-retort) was calculated. The results show that the heat requirement of Myanmar oil shale retorting can be satisfied by its high-calorie retorting gas combustion as well as the heat release from the retorting process. In the study, 33.26% surplus retorting gas is obtained, which indicates that the Myanmar oil shale processing by SJ-retort is theoretically feasible. In addition, a concise and accurate method is proposed to calculate the gas balance of the retorting process, which can calculate the dynamic equilibrium value of various types of gases (total input and output gases, recycle gases, and the new air that enters the retort) when the retorting system reaches a steady state. This method was validated with the successful operation of a pilot-scale test for oil shale retorting in Shenmu of Shanxi province and Yaojie of Gansu province in China. © 2016 American Chemical Society.


Tang X.,China University of Petroleum - Beijing | Li S.Y.,China University of Petroleum - Beijing | Yue C.T.,China University of Petroleum - Beijing | He J.L.,Shandong Energy Longkou Mining Group Co. | Hou J.L.,China University of Petroleum - Beijing
Advanced Materials Research | Year: 2013

The hydrodenitrogenation (HDN) of Longkou shale oil were carried out in microscale trick-bed reactor over a commercial NiW/Al2O3 catalyst with high HDN activity. The effects of temperature, pressure, liquid hourly space velocity (LHSV) and hydrogen/oil ratio on the conversions of total, basic and non-basic nitrogen compounds were investigated at various conditions (340-420°C, 0.2-2h-1, 4-9MPa and 400-1000 L/L). The results show that basic nitrogen compounds have higher HDN reactivity than non-basic nitrogen. The distributions and species of nitrogen compounds in Longkou shale oil were also investigated. About 33% of total nitrogen is present in big molecules with high boiling point. The nitrogen compounds in Longkou shale oil are mainly composed by seven kinds of components (nitriles, anilines, pyridines, quinolines, acridines, carbazoles and indoles). © (2013) Trans Tech Publications, Switzerland.


Tang X.,China University of Petroleum - Beijing | Li S.Y.,China University of Petroleum - Beijing | Yue C.T.,China University of Petroleum - Beijing | He J.L.,Shandong Energy Longkou Mining Group Co. | Gong Y.E.,China University of Petroleum - Beijing
Advanced Materials Research | Year: 2013

New lumping kinetic models, considering the effects of the nitrogen content in product and the correction coefficient of LHSV, were proposed to describe the hydrodesulfurization of crude Longkou shale oil. The kinetic parameters were obtained using nonlinear regression of the experimental data which were conducted in a bench-scale trick-bed reactor with NiW/Al2O3 catalyst at various conditions. The results show that the 4-lump model is the optimal model. The values of apparent activation energies of lumps 1, 2, 3 and 4 are 51.14, 62.64, 130 and 166.42kJ/mol, respectively. The validation and application of the 4-lump model were also investigated. © (2013) Trans Tech Publications, Switzerland.


Wang W.,China University of Petroleum - Beijing | Li S.,China University of Petroleum - Beijing | Li L.,China University of Petroleum - Beijing | Ma Y.,China University of Petroleum - Beijing | And 2 more authors.
Petroleum Science | Year: 2014

Pyrolysis characteristics of a North Korean oil shale and its pyrolysates were investigated in this paper. The pyrolysis experiments were conducted below 600 °C at a heating rate of 10, 15, 20 and 25 °C/min, respectively. The kinetics data were calculated using both integral and differential methods with the assumption of first order kinetics. The results show that the averaged oil content of the North Korean oil shale is about 12.1 wt% and its heat value is 13,400 kJ/kg. The oil yields at different retorting temperatures show that the higher the retorting temperature the greater the oil and retorting gas yields. The optimal retorting temperature for the North Korean oil shale is about 500 °C. The properties of the North Korean shale oil including density, viscosity, flash point and freezing point are found to be relatively low compared with those of shale oil from FuShun, China. The gasoline fraction, diesel fraction and heavy oil fraction account for 11.5 wt%, 41.5 wt% and 47 wt%, respectively. The major pyrolysis gases are CH4 (the most abundant), H2, CO2, H2S, CO, and C2-C5 hydrocarbons. The heat value of retorting gas is more than 900 kJ/mol, and the retorting gas has high sulfur content. © 2014 The Authors.


Tang X.,China University of Petroleum - Beijing | Li S.,China University of Petroleum - Beijing | Yue C.,China University of Petroleum - Beijing | He J.,Shandong Energy Longkou Mining Group Co. | Hou J.,China University of Petroleum - Beijing
Oil Shale | Year: 2013

The hydrogenation experiments of the middle distillate (MD) of Chinese Huadian shale oil were carried out in a bench-scale trickle-bed reactor using a commercial catalyst Ni-Mo-W/Al2O3 under various operating conditions. Three kinds of lumping kinetic models were developed in order to compare their capabilities to predict the concentrations of sulfur and nitrogen in hydrotreated oil samples. The results showed that three-lump and four-lump models can be reasonably used to describe hydrodesulfurization (HDS) and hydrodenitrogenation (HDN), respectively. The predictions made using lumping models agreed well with experimental data. The discrepancies between experimental and predicted data are smaller than 5%. The three-lump model for HDS and the four-lump model for HDN were also utilized for predicting reactive features and obtaining suitable operating conditions for HDS and HDN of the middle distillate (MD) of Huadian shale oil. The species and distribution of sulfur and nitrogen compounds were also investigated. © 2013 Estonian Academy Publishers.

Loading Shandong Energy Longkou Mining Group Co. collaborators
Loading Shandong Energy Longkou Mining Group Co. collaborators