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Dynamic prediction of gas emission based on wavelet neural network toolbox

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Journal of Coal Science & Engineering(China) 2013年第2期19卷 174-181页

作者： Yu-Min PAN Yong-Hong DENG Quan-Zhu ZHANG Peng-Qian XUE Information and Control Technology Institute North China Institute of Science & Technology Beijing 101601 China

This paper presents a method for dynamically predicting gas emission quantity based on the wavelet neural network （WNN） toolbox. Such a method is able to predict the gas emission quantity in adjacent subsequent time intervals through training the WNN with even time-interval samples. The method builds successive new model with the width of sliding window remaining invariable so as to obtain a dynamic prediction method for gas emission quantity. Furthermore, the method performs prediction by a self-developed WNN toolbox. Experiments indicate that such a model can overcome the deficiencies of the traditional static prediction model and can fully make use of the feature extraction capability of wavelet base function to reflect the geological feature of gas emission quantity dynamically. The method is characterized by simplicity, flexibility, small data scale, fast convergence rate and high prediction precision. In addition, the method is also characterized by certainty and repeatability of the predicted results. The effectiveness of this method is confirmed by simulation results. Therefore, this method will exert practical significance on promoting the application of WNN.

关键词： dynamic prediction gas emission wavelet neural network toolbox prediction model

Hybrid optimization model and its application in prediction of gas emission

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Journal of Coal Science & Engineering(China) 2012年第3期18卷 280-284页

作者： FU Hua SHU Dan-dan KANG Hai-chao YANG Yi-kui Faculty of Electrical and Engineering Control Liaoning Technology UniversityHuludao 125105China

According to the complex nonlinear relationship between gas emission and its effect factors, and the shortcomings that basic colony algorithm is slow, prone to early maturity and stagnation during the search, we introduced a hybrid optimization strategy into a max-rain ant colony algorithm, then use this improved ant colony algorithm to estimate the scope of RBF network parameters. According to the amount of pheromone of discrete points, the authors obtained from the interval of net- work parameters, ants optimize network parameters. Finally, local spatial expansion is introduced to get further optimization of the network. Therefore, we obtain a better time efficiency and solution efficiency optimization model called hybrid improved max-min ant system （H1-MMAS）. Simulation experiments, using these theory to predict the gas emission from the working face, show that the proposed method have high prediction feasibility and it is an effective method to predict gas emission.

关键词： max-rain ant colony algorithm optimization model gas emission prediction

gas emission from the Qingzhu River after the 2008 Wenchuan Earthquake,Southwest China

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Gas emission from the Qingzhu River after the 2008 Wenchuan ...

CONTROL OF gas emission AT COAL FACE IN CHINA

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Guodong Zheng Sheng Xu Shouyun Liang Pilong Shi Jun Zhao Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsCAS Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsCAS Scottish Universities Environmental Research Centre University of Glasgow East Kilbride School of Civil Engineering and Mechanics Lanzhou University Center for Earth Observation and Digital Earth CAS

Four gas and six water samples were collected from the Qingzhu River in Qjngchuan County,one of the regions affected by the 2008 Ms8.0 giant Wenchuan *** were discharged soon after the earthquake, but such emissions ceased in October *** predominant gases are CH,CO,N and *** N, O and noble gases are of atmospheric *** contrast,the H and CO have typical biogenic signatures, with high C/(C+C),;δC(-56.1 to-56.6%.);δD(-328 to-345‰.);andδC(-6.7 to—4.9‰).These measurements indicate that the gases are discharged from a shallow reservoir through faults or fractures caused by the *** discharging gases are significantly distinct from the natural gas fields nearby,suggesting that there are no direct pathways,such as faults or fractures,between the surface and the natural gas reservoir.

关键词： gas emission Chemical and isotopic compositions The Qingzhu River Wenchuan Earthquake

来源： cnki会议评论

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International Journal of Mining Science and Technology 1991年 55-65页

作者：俞启香郭俊峰付建华

All the underground coal mines in China are gassy mines. The gas emission at coal face increasingly grows with the increase of working depth and coal output, for example, the gas emission at a full mechanized coal face of mine No.2 at Yongquan with a daily output of 2, 000t/d is up to 66-72m~3/min. Special gas emission phenomena such as gas blowout, gas and coal outburst etc. have occurred at some faces, which threatens the safe production of face, obstructs the growth of productivity and limits the full play of mechanized equipment. In this paper, gas at face is divided, according to its origin, into three constituents, namely, coming from the coal wall, mined coal and goaf; and a formula for calculation is given. Also, the characteristics of the variation of gas emission at coal face, and the influence of mining sequence of a group of seams and supplied air quantity on the gas emission are discussed. Furthermore, based on the regularity of gas emission at coal face from the above three sources, and on

关键词： mine safety coal face gas emission prevention control

CONTROL OF gas emission AT COAL FACE IN CHINA

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Journal of China University of Mining and Technology 1991年第1期2卷 53-63页

作者：俞启香郭俊峰付建华

All the underground coal mines in China are gassy mines. The gas emission at coal face increasingly grows with the increase of working depth and coal output, for example, the gas emission at a full mechanized coal face of mine No. 2 at Yongquan with a daily output of 2. 000t/d is up to 66-72m2/min. Special gas emission phenomena such as gas blowout, gas and coal outburst etc. have occurred at some faces, which threatens the safe production of face. obstructs the growth of productivity and limits the full play of mechanized *** this paper, gas at face is divided, according to its origin, into three constituents, namely , coming from the coal wall, mined coal and goaf;and a formula for calculation is given. Also , the characteristics of the variation of gas emission at coal face, and the influence of mining sequence of a group of seams and supplied air quantity on the gas emission are discussed. Furthermore . based on the regularity of gas emission at coal face from the above three sources, and on the experiences of years, three principles on controlling gas emission at coal face are presented, that are managing the gas on classification basis, harnessing each source separately and comprehensive prevention and control. Finally, technical measures for prevention and treatment of the accumulation of gas in the upper corner of face, at the working place of coal-winning machine and in the bottom trough of conveyor are introduced.

关键词： mine safety coal face gas emission prevention control

Research on Forecast Technologyof Mine gas emission Based onFuzzy Data Mining(FDM)

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Journal of China University of Mining and Technology 2004年第2期14卷 174-178页

作者：徐常凯王耀才王军威 School of Information and Electrical Engineering CUMT Xuzhou Jiangsu 221008 China

The safe production of coalmine can be further improved by forecasting the quantity of gas emission based on the real-time data and historical data which the gas monitoring system has saved. By making use of the advantages of data warehouse and data mining technology for processing large quantity of redundancy data, the method and its application of forecasting mine gas emission quantity based on FDM were studied. The constructing fuzzy resembling relation and clustering analysis were proposed, which the potential relationship inside the gas emission data may be found. The mode finds model and forecast model were presented, and the detailed approach to realize this forecast was also proposed, which have been applied to forecast the gas emission quantity efficiently.

关键词： fuzzy data raining (FDM) gas emission forecast

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gas permeability and emission in unsaturated vegetated landfill cover with biochar addition

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Biochar 2023年第1期5卷 815-829页

作者： Junjun Ni Jingsong Zhou Yuchen Wang Haowen Guo School of Transportation Southeast UniversityNanjingChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SARChina

Plant-biochar interaction has been recognized to affect the hydraulic properties of landfill cover soils,while its influence on landfill gas emission is rarely *** study investigated the coupled effects of biochar and vegetation on gas permeability and emission in unsaturated landfill cover through an integrated theoretical modelling and laboratory ***,a gas permeability model was developed for vegetated coarse-grained soils with biochar ***,a well-instrumented laboratory column test and two tests from the literature,considering bare,grass,biochar and grass+biochar conditions,were used for model ***,a numerical parametric study was conducted to investigate the influence of root growth and drought conditions on the gas emission *** showed that the developed model can satisfactorily capture the gas permeability of unsaturated soils at various degrees of *** lowest water retention capacity,the highest gas permeability and gas emission rate after 24 months of growth were observed in the grassed ***,adding biochar in vegetated soils can maximize the water retention capacity and decrease the gas permeability,resulting in the lowest gas emission *** measured gas emission rates for the four cases meet the recommended value by the design *** parametric study showed that the increased root depth from 0.2 m to 0.4 m improved the gas emission rate by 170%in the grass case but decreased by 97%in the grass+biochar *** the severe drought condition with soil suction around 500 kPa,the gas emission rate in the grassed case exceeded the design value by 18%,while those in the biochar cases were far below the allowable ***,peanut shell biochar should be considered to amend the grassed landfill cover using coarse-grained soils as it can significantly improve engineering performance in reducing gas emissions under extreme drought conditions.

关键词： Plant-biochar interaction gas permeability model gas emission Numerical simulation

gas drainage from different mine of drainage systems for deep coal areas： optimal placement seams with high gas emissions

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International Journal of Coal Science & Technology 2015年第1期2卷 84-90页

作者： Ping Lu Ping Li Jian Chen Chuijin Zhang Junhua Xue Tao Yu Xi'an University of Science and Technology Xi'an 710054China Anhui Jianzhu University Hefei 230022 China Huainan Mining Group Co. Ltd. Huainan 232001 China

The techniques of stress relief mining in low-permeability coal seams and pillarless gob side retained roadway entry using Y-type ventilation and gas drainage systems were developed to control gas outbursts and applied successfully. However, as the mining depth increasing, parts of the gas drainage system are not suitable for mines with high gas emissions. Because larger mining depths cause higher ground stresses, it becomes extremely difficult to maintain long gob side roadways. The greater deformation suffered by the roadway is not favorable lor borehole drilling for continuous gas drainage. To solve these problems, Y-type ventilation and gas drainage systems installed from a roof roadway were designed for drainage optimization. This system was designed based on a gas-enrichment zone analysis developed from mining the 11-2 coal seam in the Zhuji Mine at Huainan, Anhui Province, China. The method of Y-type gas extraction from different mine areas was applied to the panel 1112（1） in the Zhuji Mine. The absolute gas emission rate was up to 116.3 m^3/min with an average flow of 69.1 m^3/min at an average drainage concentration of nearly 85 %. After the Y-type method was adopted, the concentration of gas in the return air was 0.15 %-0.64 %, averaging 0.39 % with a ventilation rate of 2100-2750 m^3/min. The gas management system proved to be efficient, and the effective gas control allowed safe production to continue .

关键词： gas drainage Different gas sources Y-type ventilation Gob side retained roadway gas emission gas-enrichment zone

Thermal behaviors, combustion mechanisms,evolved gasses, and ash analysis of spent potlining for a hazardous waste management

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Journal of Environmental Sciences 2021年第9期33卷 124-137页

作者： Guang Sun Gang Zhang Jingyong Liu Deniz Eren Evrendilek Musa Buyukada Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes Dongguan University of TechnologyDongguan 523808China Department of Computing Science Simon Fraser UniversityBritish Columbia V5ACanada Department of Chemical Engineering Bolu Abant Izzet Baysal UniversityBolu 14052Turkey

An unavoidable but reusable waste so as to enhance a more circular waste utilization has been spent potlining(SPL) generated by the aluminum *** combustion mechanisms, evolved gasses, and ash properties of SPL were characterized dynamically in response to the elevated temperature and heating *** scanning calorimetric(DSC) results indicated an exothermic reaction behavior probably able to meet the energy needs of various industrial *** reaction mechanisms for the SPL combustion were best described using the 1.5-, 3-and 2.5-order reaction *** volatilization rate of the flue gas was estimated at 2.24%.The SPL combustion emitted CO_(2), HNCO, NO, and NO_(2) but SO_(x).The joint optimization of remaining mass, derivative thermogravimetry, and derivative DSC was achieved with the optimal temperature and heating rate combination of 783.5 ℃, and 5 ℃/min, *** between temperature and heating rate exerted the strongest and weakest impact on DSC and remaining mass, *** fluorine mainly as the formation of substantial NaF and CaF_(2) in the residual ***,the composition and effect of environment of residual solid were *** ash slagging tendency and its mineral deposition mechanisms were elucidated in terms of turning SPL waste into a benign input to a circular waste utilization.

关键词： Spent potlining Thermal decomposition Heat release Reaction mechanism gas emission

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