Zhao S.,China Coal Research Institute
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2017
With the typical mining face with high outburst risk as background, the cut stress in the isolated working face with high outburst risk was analyzed, and based on field measurement of such critical indexes of outburst risk as drilling bits and electromagnetic radiation, the multi-parameter outburst monitoring and assessment system was built for the dynamic control of stress and outburst prevention during the cut transfixion. The results have shown that it is predicting and pertinent to regulate and control rock burst stress based on the tendency of microseismic energy release and its position accumulation; the technologies of stress control and outburst prevention based on multi-parameter monitoring of outburst and the real-time field feedback of outburst prevention effect, help realize smooth cut transfixion in the isolated working face with high outburst risk. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
Liu Z.,Beijing University of Chemical Technology |
Shi S.,China Coal Research Institute |
Li Y.,Shanxi Institute of Coal CAS Chemistry
Chemical Engineering Science | Year: 2010
With fast increasing demand in liquid transportation fuels, limited and unevenly distributed petroleum resources, and volatile petroleum prices, coal liquefaction technologies have again received the world's attention since the beginning of this century. China has actively pursued R&D of coal liquefaction technologies in the past decade and is deploying the first and the largest direct coal liquefaction plant since WWII and the largest indirect coal liquefaction plants after Sasol, South Africa. This paper analyzes the historical developments of coal liquefaction technologies from science point of view, presents recent developments of the technologies in China, and identifies challenges of the technologies towards successful industrial application. © 2009 Elsevier Ltd. All rights reserved.
Liang Y.,China Coal Research Institute |
Zeng W.,Tianjin University
Journal of Hazardous Materials | Year: 2010
Through amending the SENKIN code of CHEMKIN III chemical kinetics package, a computational model of gas explosion in a constant volume bomb was built, and the detailed reaction mechanism (GRI-Mech 3.0) was adopted. The mole fraction profiles of reactants, some selected free radicals and catastrophic gases in the process of gas explosion were analyzed by this model. Furthermore, through the sensitivity analysis of the reaction mechanism of gas explosion, the dominant reactions that affect gas explosion and the formation of catastrophic gases were found out. At the same time, the inhibition mechanisms of water on gas explosion and the formation of catastrophic gases were analyzed. The results show that the induced explosion time is prolonged, and the mole fractions of reactant species such as CH4, O2 and catastrophic gases such as CO, CO2 and NO are decreased as water is added to the mixed gas. With the water fraction in the mixed gas increasing, the sensitivities of the dominant reactions contributing to CH4, CO2 are decreased and the sensitivity coefficients of CH4, CO and NO mole fractions are also decreased. The inhibition of gas explosion with water addition can be ascribed to the significant decrease of H, O and OH in the process of gas explosion due to the water presence. © 2009 Elsevier B.V. All rights reserved.
Shidai,China Coal Research Institute
Applied Mechanics and Materials | Year: 2013
Land Reclamation Suitability Evaluation is the basis to properly implement land reclamation, and to develop a practical land reclamation project. In this study, we've given full account to the drawbacks of the Limit Method, and precisely divided the evaluation units, to make Limit Method evaluation more accurate. We've put this method in practice, and obtained more scientific evaluation results. Mining-damaged land reclamation suitability evaluation is based on the natural properties and damage conditions of the land, with socio-economic factors as background conditions, to assess the suitability and limits of future land reclamation for agriculture, forestry, animal husbandry, sideline production, fisheries, construction and other uses. Clear reclamation suitability evaluation can specify future land use, and provide the basis for land reclamation work. The evaluation is based on the investigation and prediction of the damaged land. It selects the influencing factors, determines the value of the factor indicators and the weights of various factors, assesses the most suitable reclamation and utilization direction for the damaged land, and then builds the best land reclamation mode. Land reclamation suitability evaluation is aimed to determine the direction and standards of reclamation, and to guide the land reclamation project design. © (2013) Trans Tech Publications, Switzerland.
Zhang L.,China Coal Research Institute
Applied Mechanics and Materials | Year: 2013
Degree of mechanization of extremely thin coal seam mining is growing, with introducing the main mining method currently used by the different inclination of the extremely thin coal seams in China, focusing on the different mining technology and related ancillary mining equipment development status and existing problems, and discuss the extremely thin coal seam in the future to realize the remote control, automatic monitoring and unmanned mining development trend. © (2013) Trans Tech Publications, Switzerland.
Zhang L.,China Coal Research Institute
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013
At present, the main methods for predicting outburst in China are mainly based on gas dynamic phenomena and the so-called four-parameter method (e.g. gas pressure of coal seam, failure mode of coal mass, hardiness coefficient of coal mass, and initial diffusion velocity of gas). The four-parameter method requires that coal seam should be confirmed as outburst seam only if all of the four parameters exceed their alternative critical values, and the critical value of gas pressure is 0.74 MPa. However, practices show that outbursts had happened even though the gas pressures were less than 0.74 MPa. In this paper, the outburst mechanism was overviewed by compressible fluid mechanics, and a new predicting index F was established by using the stress analysis method of multi-phase continuum mechanics. In addition, calculation method for determining the related parameters was also given. Case studies reveal that the formula accords well with the practice.
Li L.-T.,China Coal Research Institute
Meitan Xuebao/Journal of the China Coal Society | Year: 2010
In order to clarify the mechanism of desulphurization and denitrification from flue gas on activated coke, the adsorption behaviors of SO2 and NO on activated coke in various simulating flue gas were studied in the experiment, and the pore structures and surface properties were analyzed using SEM, XPS and BET respectively. The experimental results show that the performance of desulphurization and denitrification are related to the pore structures and the surface chemistry of activated coke, and the pore volume is the key factor, and the surface functions is the important factor which is the activating centre for adsorption and catalysis of SO2 and NO. Moreover, SO2 takes priority of NO on activated coke; and single CO2, O2 or H2O have no distinct effect on desulphurization and denitrification from flue gas, but the effect of desulphurization and denitrification are distinct while O2 and H2O existed in flue gas at one time.
Zhang X.-J.,China Coal Research Institute
Meitan Xuebao/Journal of the China Coal Society | Year: 2011
The developing situation of hydrogenation technologies of coal tar from mid-low-temperature coal carbonization during last couple of decades was analyzed. All of them were classified into four categories depending upon their processing features. And the advantage and disadvantage of each category technology were discussed. As a result, the category of coal tar hydrocracking processing with suspending-bed reactor or slurry-bed reactor is considered to be the developing trend after comparing each technology, because it is better coal tar utility efficiency and higher products yields.
Liang Y.-T.,China Coal Research Institute
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2010
The SENKIN code of the CHEMKIN III chemical kinetics package was modified to include a computational gas-explosion model within a constant volume. The code was used to analyze reaction kinetics during a gas explosion. The detailed reaction mechanism included 16 reactive species and 41 reaction steps. The effect of temperature, pressure and mole-fraction was examined. Sensitivity analysis indicated the key steps that affect gas explosions and which gas mixtures were most prone to explosion. After explosion the predicted temperature and pressure were about 2 800 K and 0.24 MPa. The key steps at the beginning of the explosion are CH3+O2 =CH3O+O and CH4+HO2 =CH3+H2O2. The key steps that are involved in the formation CO and CO2 are CH3+O2 =CH3O+O, CH4+O2 =CH3+HO2, CH4+HO2 =CH3+H2O2, CH3+HO2 =CH3O+OH, and H+O2=OH+O.
News Article | December 2, 2016
China’s coal prices have soared this year due to domestic supply issues as the country tried to cut overcapacity, but new analysis suggests China’s coal demand will stabilize at around 4 billion tonnes, demand which will be able to be met easily with domestic supply, leading to the eventual phase-out of coal imports. According to new research from the Coal Strategic Planning Research Institute, part of the China Coal Research Institute, Chinese demand for coal will settle at around 4 billion tonnes per year, which will be well within the range of domestic supply. As a result, the country will begin to start phasing out coal imports altogether over the next few years. This will have massive implications for offshore coal exporters like Australia, who are already feeling the pinch of China’s declining interest. According to the authors of the report, there was no obvious growth in coal demand or production costs which would explain the recent price increase, rather, government policies intended to combat overcapacity which eliminated more than 200 million tonnes of supply, while cutting annual work days for coal companies from 330 to 276, saw coal output drop 10% subsequently creating a 222 million tonne gap between production and consumption throughout the first three quarters of the year. High temperatures and transportation issues also added to underlying issues. But there is a much larger issue at play in China, with coal consumption steadily declining over the past several years. In the first three quarters of 2016 coal consumption decreased by 68 million tonnes, or 2.4%. This is unsurprising considering all that China is doing to ramp up its renewable energy capacity and mitigate the pollution from its coal sector. The report’s analysis claims that China’s current supply of coal can meet China’s projected 4 billion tonnes of consumption demand, leading to declines in imported coal. Buy a cool T-shirt or mug in the CleanTechnica store! Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.