China National Coal Group Corporation

Beijing, China

China National Coal Group Corporation

Beijing, China
Time filter
Source Type

Qi W.,China National Coal Group Corporation
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2017

This paper analyzes the composition and properties of mixed C4 of by-products from methanol to olefins(DMTO)unit at Dalian Institute of Chemical Physics, Chinese Academy of Sciences. It introduces the current market status and mature technologies of related products of 2-propyl-heptanol(2-PH)and propylene. The application process that mixed C4 is used to synthesize methyl tert-butyl ether and 1-butylene, then most of 2-butene are converted to propylene via conversion process is offered based on the practices of mixed C4 in petrochemical industry, market prospect and technical maturity of 2-PH and propylene, as well as the demand of 1-butene comonomer for polyethylene production. The market prospects, investment and profits of 2-PH and propylene are compared to provide suggestions for process route of C4 to propylene in DMTO unit. © 2017, Beijing Yanshan Branch, Assets Management Corporation, SINOPEC. All right reserved.

Sun B.,North China Electrical Power University | Zhao L.,North China Electrical Power University | Zhao L.,China National Coal Group Corporation
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2017

To investigate the effects of bed temperature and limestone on the combustion stability and pollutant emission of a CFB boiler, combustion tests were conducted in a 3 MW CFB boiler combustion test bed at different loads and different primary to secondary air ratios burning the design coal. Results show that the ignition temperature of design coal is 436℃ and stable operation can be kept in the test bed when the bed temperature is 780℃. Limestone can improve the desulfurization efficiency, but would decrease the combustion efficiency. If the coal feed is interrupted for ten minutes, normal operation could still be recovered automatically after the coal feed continues again. The self-desulfurization efficiency of design coal gets up to 38%, while its desulfurization efficiency lies in 88. 2%-95.1% for the Ca/S mole ratio of 3. 7 in the case of bed temperature fluctuation. The load and primary air ratio effects more on NOx generation than other factors, and the NOx emission can drop down to 100 mg/m3 through reasonable adjustments on the load and primary air ratio. © 2017, Editorial Department of Chinese Society of Power Engineering. All right reserved.

Cai F.,China University of Mining and Technology | Cai F.,China National Coal Group Corporation | Miao P.,China University of Mining and Technology | Wang E.,China University of Mining and Technology | Wang J.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2017

Based on the theory of retained entry along gob-side with immediate roof of limestone, the roof fracture state of the roadway-side packing to retain gob-side entry and retaining gob-side entry by caving the roof and relieving pressure was analyzed, two different mechanical models of roof fracture states were established respectively, and the calculation method of support resistance in the roof was derived. Research has indicated that when the cutter roof resistance Q is less than or equal to ql, its roof breaks along the coal wall inside certain depth, and the cantilever beam structure of gob-side entry roof can transfer the pressure from stope rock beam and overlying rock movement to the surrounding rocks in the roadway; when the cutter roof resistance Q is greater than or equal to ql, and under the combination action of reinforcing struts inside the roadway, pier stud along roadway-side and the cutting seam of the roadway-side cutting the roof, the direct hard limestone roof cut along the seam slides along the rupture surface structure, which actively controls the roof fracture state, cuts off the stress of movement and deformation from the hard limestone roof to the overburden strata, optimizes the bearing structure in the roof and surrounding rocks, and reduces the additional load of bore by the support body of the roadside. The relative design method was applied in the experiment of gob-side entry formed by cutting the hard limestone roof sliding down in Nantun coal mine, and has demonstrated its effectiveness. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

Liu J.,Wuhan Institute of Technology | Zhang H.,Wuhan Institute of Technology | Zeng H.,Wuhan Institute of Technology | Tang W.,Wuhan Institute of Technology | Guan Z.,China National Coal Group Corporation
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2017

With the application of digital sinusoidal pulse width modulation (SPWM) control technologies, the precision, responding time, security and stability of the pulse width gating signals can be improved conspicuously. The digital theory of natural sampling SPWM based on filed programmable gate array (FPGA) was studied with the combination of characteristics of high voltage and high power three-level neutral point clamped (NPC) inverter. A framework of full digital natural sampling SPWM was set up. The digital realization method of triangular carrier wave and sinusoidal modulation wave generation, switching states combination and dead time configuration were study in detail. And a FPGA based hyper-real-time duty cycle calculation method was presented, by using this method the Taylor series expansion and convergence judgment could be avoid. The output waveform by natural sampling has less harmonics, compared with that obtained by regular sampling. At last, the theory research has been realized by using very-high-speed integrated circuit hardware description language (VHDL) language and a FPGA chip. The correctness and the feasibility of the digitization theory is proved through both software simulation and experiment results. © 2017 Chin. Soc. for Elec. Eng.

Yao Q.-L.,China University of Mining and Technology | Li B.,China University of Mining and Technology | Li B.,China National Coal Group Corporation | Ren S.-J.,China University of Mining and Technology | Li X.-H.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011

The supporting technology of hollow grouted anchor cable combined with high performance bolt can effectively the instability of high ground stress roadway in soft coal seams. There are some problems during deep driving for the return airway of fully mechanized sub-level caving face 3313 in a coal mine, such as great deformation and supporting failure, etc. The main factors of roadway instability are high ground stress, poor mechanical properties of surrounding rock, and unreasonable support parameters. Releasing pressure under high pre-stressed bolt supporting and improving the mechanical properties of roof strata in a large range by grouting using hollow grouted anchor cable are the keys of the technology. This technology can effectively control the development of plastic zone, enhance the strength of roof strata and improve the stress state of bolt (anchor cable). Practice shows that the technology can reduce the damaged zones to 1 m and decrease the deformation of roadway roof, floor, and roadway's sides by 63.6%, 53.3% and 51.7% respectively, which also effectively controls the deformation of surrounding rock in this roadway.

Zhang X.,Taiyuan University of Technology | Wang A.,Taiyuan University of Technology | Wang A.,China National Coal Group Corporation | Li J.,Taiyuan University of Technology
Procedia Engineering | Year: 2011

This paper introduced function design and development flow of virtual reality system of fully mechanized mining face. In the process of geometric modeling, element partitioning, instance,atomization and other technologies were used to improve the real-time performance of virtual view. With hydraulic support as the example,based on analysis of 4-linkage motion mechanism,the paper built the motion model and realized behavioral modeling. Virtual reality system in fully mechanized mining face was built by means of OpenGL and Visual C++ 6.0 and it has obvious stereo vision effect.The system has interaction functions of scene roaming and equipment operation. In addition, the production process of fully mechanized mining face could be simulated. Design and realization of this system put forward a new approach to miner training, student practice and disaster relief maneuvers. © 2011 Published by Elsevier Ltd.

Zhang X.,Taiyuan University of Technology | Zhang D.,Taiyuan University of Technology | Wang A.,Taiyuan University of Technology | Wang A.,China National Coal Group Corporation | Geng Y.,Taiyuan University of Technology
Particuology | Year: 2015

In this study, experiments on fly ash conveying were carried out with a home-made long-distance positive-pressure pneumatic conveying system equipped with a high performance electrical capacitance tomography system to observe the transient characteristics of gas-solid two-phase flow. The experimental results indicated that solids throughput increased with increasing solids-gas ratio when the conveying pipeline was not plugged. Moreover, the optimum operating state was determined for the 1000 m long conveying pipeline with a throttle plate of 26 orifices. At this state the solids throughput was about 12.97 t/h. Additionally, the transportation pattern of fly ash gradually changed from sparse-dense flow to partial and plug flows with increasing conveying distance because of the conveying pressure loss. These experimental results provide important reference data for the development of pneumatic conveying technology. © 2015 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy ofSciences. Published by Elsevier B.V. All rights reserved.

Qu Z.-M.,Hebei University of Engineering | Zhou X.-Q.,China University of Mining and Technology | Li T.-S.,China National Coal Group Corporation
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2011

According to the volatile combustion, the mathematical and physical models on the volatilization combustion of coal field fire area are established. The governing equations are analyzed by analytic method. The parameters such as volatilization combustion speed, the content of volatile component and the flame temperature are obtained at relatively high temperature environment. According to the solutions, the flame temperature of the volatilization combustion is calculated by the heat insulation temperature in the light of the low-heat value of the volatile component. Due to the free or forced convection in the actual fire area, the true temperature would be lower than the calculation. Through experiment, heating process takes the greatest impact on the heating surface but least on inner parts. The temperature is increased and the heating surface temperature will exceed the temperature and continue increasing, which indicates that the coal begins oxidation. While the airflow is increased, the temperature will be slightly increased. The temperature is descent more slightly in the coal temperature because of thermal radiation.

Li X.,China National Coal Group Corporation | He M.,China University of Mining and Technology
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015

In order to resolve the problem with long working period of processing mass data in geothermal and geological domains and the requirements for rapid and scientific management decisions in the geothermal work in Tianjin, and satisfy the needs of scientific planning, a simple and intelligent tool is provided for the sustainable exploitation of geothermal resources. Based on the previous geothermal work in Tianjin, the methodology of “two lines and one surface” 3D dynamic region division is presented. The geothermal reservoir sub-region planning project and the geothermal well search and approval system are developed by using MapGIS SDK and Visual Basic, which provide a rapid, overall and directly perceived sub-region planning with the function of dynamic tracking. In the planning period, a set of annual region division planning map will be produced by the system based on the annual geothermal reservoir dynamic observation data, for the reference of the administrative department commanding planning status and dynamic approval. ©, 2015, Jilin University Press. All right reserved.

Tan Q.-L.,North China Electrical Power University | Yuan H.-Z.,North China Electrical Power University | Tan Y.-K.,North China Electrical Power University | Zhang X.-P.,North China Electrical Power University | Li X.-F.,China National Coal Group Corporation
2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010 | Year: 2010

Support vector machines (SVM) is a widely used method which can treat problems involving small sample, devilish learning, and high dimension. The current paper conduct a multivariate SVM in a total-factor production framework, and the GDP per capita, capital stock and labor are taken as the independent variables and the energy consumption is the dependent variable. The Gaussian radial basis function is taken as the kernel function, and then the energy consumptions of Beijing between the periods 1978-2008 are forecasted. The empirical results suggest that the multivariable SVM is valid in forecasting energy consumption. ©2010 IEEE.

Loading China National Coal Group Corporation collaborators
Loading China National Coal Group Corporation collaborators