In order to solve the problems of deeply inclined coal seam dip Angle, equipment use more difficulties, the mining of adit qin coal and rock pressure of continuous miner in the slow corners of coal mining, put forward the optimization techniques of < 10 ° pseudo inclined, even the transit system extension, mining adit "two slope and three feed" and the loosening zone testing, stress and strain monitoring and support comprehensive measures such as joint monitoring deformation of caving working face roof. The results showed that: (1) through the equipment, technology and process optimization, solves the problem of the scene effectively; (2) the main shipping lane and the working face monitoring, roadway deformation test of 1.1 ~ 1.3 m of the loose circle, anchor length optimization to 2.4 m, increases the stability of surrounding rock; Between - isolated coal pillar - basic roof coal pillar mining adit \"is the community interaction, isolation bearing plunge until failure process make the roof support, coal pillar mining section of the formed article 1.5 ~ 2 periodic weighting characteristic; walking stick a stent supporting pressure monitoring, guarantee the alley mining adit triangle roof stability effectively.

Describes the 10 mine of Pingmei shares existing waste discharge system problems, from a technical analysis of the mine feasibility of system transformation of refuse. Through the renovation scheme of safety, technical and economic comparison, draws the conclusion: the replacement of wellbore and new special gangue roadway is in line with the retrofit scheme of Pingdingshan mining area of the old mine actual production, the nearby mines row gangue system transformation provides reference experience

In this paper, aiming at the adverse effects of main roof’s hanging roof length on the stability of narrow coal pillar, theoretical analysis and numerical simulation are used to study the excavation position and the reasonable width of narrow coal pillar. The results show that the length of hanging roof in main roof can directly affects the stability of the roadway surrounding rock. In order to make the fracture line located inside the coal wall, improve the stability of the surrounding rock and the supporting capacity of coal pillar, ascertaining that the reasonable width of coal pillar is 5m. The industrial test show that the selection of the roadway’s position and the width of narrow coal pillar are scientific and reasonable, and satisfactory technical and economic effects are achieved.

Abstract:As the coal bed methane (CBM) production of our country commonly exists some problems such as large area of CBM extraction, wide distribution, decentralized and remote location of most wells, which result in difficult construction and high cost of traditional AC distribution network. In this sense, this paper proposed a DC microgrid supply system for CBM extraction, where photovoltaic panels and batteries are employed to supply the beam pump for CBM wells. The simulation model based on MATLAB/SIMULINK verifies the theoretical analysis.

As an important industrial workplace, according to the requirement of the digital mines, the compressor workroom is improved to realize the remote automatic control and unattended monitoring systems. In this paper, basing on the PLC and Configuration software,the remote control system is developed. Moreover, the industrial video cameras are distributed to realize the video monitoring of the key equipment and workplace. The data of the control systems and video monitoring systems is transmitted to the information center of the mine by the Gigabit industrial Ethernet ring network. Consequently, the digital and network monitoring system of compressor workroom was greatly improved to promote the development of digital mines.

In order to effectively prevent and control the risk of safety in production of coal mining enterprises, the article uses FMEA to analyze potential failure modes, effects and causes of every node of coal mining production process, and based on this, the article identifies coal mining risk source. Finally, the article presents a complete set of coal mining enterprises emergency planning from three areas of the daily inspection standard, the daily operations standard, the emergency alarm process and emergency operating standard. The results showed that the emergency planning designed by this article is operational and rational, and it can prevent coal mining enterprises produce risk effectively.

In view of problems that limited coal kinds for loading and insufficient loading capacity of conventional vehicle loading station, the paper proposed a technology of multi channel for vehicle loading, described technological process, determined main technical parameters and made the research of coordinated distribution technology，Accurate weighing technology and data access technology. using the multi channel loading technology ,we achieved strong loading capacity, High weighing accuracy, high degree of intelligence and automation and green environmental protection.

To increase the raw coal clean utilization and economic benefits of Yidong coal mine, the design of coal separation process was performed based on the coal property analysis. No. 1-2 and No. 2-2 coal seams both have extra-low ash content, high volatile content, and extra-low sulfur content. The two coal can be used as high grade heating coal. The two both have middle washability. Based on the coal property analysis, the separation process was determined with dense medium shallow groove separator for 150-13 mm lump coal, pressurized-fed two-product dense medium cyclone for 13-1.5 mm slack coal, spiral separator for 1.5-0.15 mm coal and press filter for 0.15-0 mm coal slime. The proposed separation process is used in the coal separation plant construction. The product quality is suitable for the market. The design provides a reference for the design of similar coal separation plant.

Many special characteristics exist in the energy conservation assessment of coal construction projects, and some questions in the energy saving assessment of mine development and mining could be worth to study. According to the reports of project energy saving assessment and the experience of reviewing, the questions about choosing the mouth of a mine, Choosing the methods of exploiting, arrangement of mining area roadway and choosing mining equipment will be discussed in this article. By analyzing and discussing the above questions, the author offers some proposals of optimizing design projects for the referencing of writing and reviewing ‘Energy Conversation Report’.

In view of the problem of low utilization rate in coal mine shaft blasting hole ,poor molding,uses the cutting seam cartridge directional fracture control blasting technology. By using cut tube charge in the contour hole,under the premise of constant single hole charge, reduces the number of contour hole from 52 to 35, hole distance increases from 600mm to 800mm and implements the control blasting. Field blasting application effect shows: cut tube energy accumulated charge control blasting can significantly improve the utilization rate of blasting hole and hole mark rate, half hole mark rate increased by 52%, shaft contour roughness is in±5cm ,contour hole cut tube charge can reduce the blasting disturbance and damage to surrounding rock,improve the smoothing blasting effect, improve the shaft heading speed.

Aiming at the deep high stress soft rock roadway under high tectonic stress extrusion produced large deformation instability problem, put forward the anchor high Strength full range, large range, deep rock grouting reinforcement, achieve high strength hollow bolt / cable anchor to anchor by the transformation, at the same time, the consolidation of surrounding rock quality and strong, improve the surrounding rock and supporting structure coupling self bearing capacity; Pingdingshan coal mine three level by a delay test section by air rise up mining of high strength and high performance bolting materials, hollow bolt / cable, high pressure grouting of surrounding rock in large range, deep grouting, and the roadway surface displacement, deep separation deformation, rupture and other comprehensive methods to determine the strength at anchor reasonable time, measured two for deformation is less than 10mm, the maximum deformation of roof 600mm, long-term stability can be achieved by simple repair of roadway.

The advanced geological prediction GPT for roadway excavation based on the seismic scattering field theory are researched and presented, relevant data process and offset imaging interpretation software GPTWIN are developed, and according to the requirement for safe production in coal mine, applicable equipment is selected and programming flow is worked out. Finally, an advanced geological prediction for the roadway excavation is tested and prediction results are obtained, the reliability is verified by the practice.

To find out the distribition of karst runoff zone in 13-15 mining area of Xi′an coalmine, judge general direction of the runoff zone by analyzing geological and hydrogeological data; confirm the location and direction of the runoff zone by transient electromagnetic combining drilling data and connectivity experiment. Result shows that a karst runoff zone has been detected in 13-15 mining area using the technology, the runoff zone strikes SN and is consistent with the main fault direction in the mine, which manifestes as caverns and dissolved pores, karst water runoffs from north to south. The technology has certain reference significance in the exploration of karst runoff in other mines and prevention of mine water.

Mine in the layout of the fully mechanized working face, tend to be faults, erosion and other geologic conditions or affected by the mine with irregular boundary. In these areas should not be arranged in regular shape of strip shape in fully mechanized coal mining face, corner of fully mechanized coal face outside the area can only be the Wongawilli mining method mining or abandoned mining, the recovery rate is greatly reduced, causing tremendous waste of coal resources. In order to solve this problem, we further improve the resource recovery rate of these regions, and the trend of the coal mine is based on the geological structure, and the inclined length of the fully mechanized face can be lengthened or shortened. In addition to the layout of the roadway, the equipment on the surface of the installation of the new requirements, this paper for the full mechanized mining face layout design and working surface equipment installed in a detailed study, the results are applicable to all existing irregular area layout of the fully mechanized coal face.

According to there are more collapse posts to affect coal mining face high efficient mining in Sanjusheng coal mine, the method of field measurement was applied to study the collapse posts affected to the mine strata pressure in 4304 coal mining face during the initial mining. The results showed that: due to the affected of collapse posts, the initial roof weighting was different of the past performance, the strength was reduced, time was early, and step distance was reduced. Analysis of the experimental results have reference for push the collapse posts during the initial mining under similar conditions.

To eliminate the security risks from metal bolt-rod legacy in front of the long-wall working face.On the basis of time-dependent behavior of bolt anchoring and stability criterion of surrounding rock, the research optimized the reasonable recovery range of the bolt in front of the long-wall working face and developed an recovery equipment of bolt-rod which adopting combined hollow auger drill as main body. It is proved by test on site that the recovery schemes are feasible and practical.

Part of hoist system in coal mine adopt full digital DC motor speed control devices, which easily brings about harmonic wave and pollutes the coal mine grid. In order to solve this problem in the coal mine, four-wire system based on three-level four-leg topological structure is developed in this paper. The frequency dividing control algorithm is studied and Emphasis on specify the harmonic current compensation control technology. At last, It gives the specified harmonic current compensation control method for three-level four-leg through MATLAB simulation, and verify the control method through the experiment.

In order to solve the problem of timing of roadway-side support, the structure of surrounding rock in gob-side entry retaining was analyzed, the analysis showed that the three hinged girder structure of the basic roof of retained roadway was the key factors of the deformation of surrounding rock in gob-side entry retaining, and combined with the given deformation of surrounding rock in gob-side entry retaining to study the timing of roadway-side support, it's proposed that roadway-side support should adapt to the given deformation of surrounding rock of roadway, especially the given deformation of roof movement. Judging the situation of the basic roof contacting with coal gangue was needed to determine the timing of roadway-side support through monitoring the quantity of roof falling. The numerical simulation method was applied to assess the rationality of roadway-side support time in the process of gob-side entry retaining of Shenhuo group Xuehu coal mine, the result showed that when the roadway-side support lagged 10 m distance after working face, the support effect was good, and the best timing of roadway-side support was that the roadway-side support lagged 25 m distance after working face, these results could be used to provide technical support in site construction of gob-side entry retaining to the mine.

In order to solve the problem of gas overrun in long wall face at Yangcunpu Coal Mining in Sichuan depression, this paper analyzed the migration path and abundant region of pressure-relieved gas and optimized the drainage parameters by means of strata movement theory and the roof-cross borehole gas drainage field tests. The results showed that the best drainage region is under the overlaying key strata due to its significantly impediments to gas, and that field test results accord with theoretical analysis, and that the reasonable gas drainage parameters were determined and gas drainage efficiency was improved remarkably, and that the unsafe factor of gas overrun was successfully eliminated and the drained gas was used to generate electricity. The successful experiences can be introduced to other similar mines due to good social and economic effect.

The strength of set cement and the bonding power of bonding surface between ambient medium and set cement are main factors that influence the waterproof performance in freezing holes, and the action of freeze-thaw circulation greatly change set cement microstructure, which weaken the waterproof performance. Simulation test method was conducted to study the change law of the set cement strength and the bonding power between freezing pipes, hole wall and set cement in different ratio under the action of freeze-thaw circulation. The results showed that action of freeze-thaw circulation can damage the mechanical properties of the set cement obviously, and through increasing the set cement strength and adulterating proper level of swelling agent can considerably improve the bonding power between ambient medium and set cement, which can reduce the freeze-thaw damage and enhance the waterproof performance.

In order to study the influence caused by mechanical slope excavation on the stability of existing tunnel, the field measurement and numerical simulation are effective methods. The monitoring scheme is determined according to "highway tunnel design specification" (JTG D70-2004). We use M20 blasting vibration test instrument monitoring the vibration velocity, and make statistical analysis, and study the relationship between each measuring point’s vibration velocity and the construction schedule, and through numerical simulation studying the influence caused by slope mechanical excavation on the deformation and stress of tunnel surrounding rock and. Research shows that: the greater the distance to source is, the smaller the vibration velocity is , and generally not more than 0.79cm/s, and vibration velocity is mainly between 0.01cm/s and 0.3cm/s. Slope mechanical excavation has less influence on the existing tunnel. Due to sloping relief effect, the existing tunnel has the trend of moving upper and left, but it is very small, and provides a reference for similar construction projects.

In order to study the effects of fly ash particle size on the properties of high concentration cemented filling materials, the undisturbed fly ash was ground and analyzed, and the fly ash particles with different particle sizes were obtained. Through the test of void fraction of fly ash - cement - coal gangue mixed material, the effect of fly ash particle size characteristics on the void fraction of mixed material porosity and the relationship between the void fraction and properties of slurry including the rheological characteristics, the slump and the uniaxial compressive strength were studied. The results show that there is a good linear relationship between the slump of mixed material and the void fraction; the yield stress and plastic viscosity of the slurry decreased with the decrease of the particle size of the fly ash; the uniaxial compressive strength increased with the decrease of the particle size.

Mine air temperature forecast is the foundation of underground roadway air state parameters. It provides the basis for the analysis of high temperature thermal disaster and the design of cooling system in mine. The air volume for a single tunnel air temperature prediction model is known. However, the air flow distribution can be effected by natural wind pressure, which is due to temperature difference in mine ventilation network. So the coupling relationship between the air temperature and air flow are determined. It also puts forward a forecasting method of air temperature based on an overall mine ventilation network solution. Through iterative calculation of air volume and air temperature, the prediction of them is achieved in a balanced equilibrium. The software is developed for calculating the temperature of airflow and humidity in the mine roadway based on an ObjectARX platform. Through the simulation of Zhaolou coal mine ventilation network calculation results and the measured value, the air temperature and the natural wind pressure are predicted accurately in the mine ventilation network. The measured and calculated data agree well, indicating that the forecasting method has better applicability.

In order to grasp the migration regularities of dust in comprehensive tunneling face of rock roadway with far-pressing-near –absorption ventilation system. On the background of auxiliary transportation lane in the north limb of Zhangcun mine, by using the method of combining numerical simulations and field measurement, the discrete phase model for computational fluid mechanics is used for numerical simulation research of the wind and dust concentration field distribution regularities. The results of research show far-pressing-near –absorption ventilation system can effectively restrain the high concentration of dust diffusing to the rear of roadheader, and the accumulation of dust can be discharged quickly by dust collector, improving the working environment and protecting the workers' physical and mental health.

The article presents the difficulties of drilling gas effective extracting radius inspection process, analyzes the grey-scale relations of measuring parameters using the method of stress index. Establishes a gray prediction model and compares the data with the measured data, presents the grey forecasting theory of the effective drainage radius of borehole gas. The conclusion is to predict the maximum value in the twenty-fifth day to the pressure gauge is below 56%, and with the total observation time, prediction of the gauge has continued to decline, and measured twenty-third days of data is only 2 days.. The research results show that the grey forecasting model is proposed, in order to overcome the difficulties in the process of extracting the effective drainage radius of effective drainage radius of drilling gas, a reliable theoretical basis and data comparison are provided.

Abstract: In order to diffuse the storage energy of the coal pile and suppress the disaster of the coal fire happen. Based on the extraction of coal spontaneous energy effectively with the heat pipe, it was got the rule of coal pile natural cooling and forced cooling by heat pipe inserted coal pile, and coal pile temperature distribution with heat pipe space, Depth and angle distribution. The experimental research result was shown heat pipe can implement effectively to diffuse the storage energy of the coal pile oxygenation, and thus prevent continuously coal fire spread. It was feasible to coal thermal energy reused

The location of an active power filter (APF) is extremely important to suppress harmonic current in coalmine underground power grid where the APF rate is limited. A new strategy for the best placement of an APF is developed in this paper. The strategy compute the harmonic similarity that relates the voltage at the nonlinear load bus to another bus in the power system first, and then determine the optimal bus to place the APF through selection algorithm. This strategy will both reduce the total harmonic distortion and simultaneously optimize the quality of power on an overall system. The validity of the developed strategy is verified by the simulation results

In this paper, the prediction model of coal slime flotation dosage based on GA-BP neural network is present to dispose of the problems that the prediction is not accurate in the existing coal slime flotation dosage.Firstly, the influence factors are screened out through MIV value method,and then the prediction model based on GA-BP neural network of dosing is established.MIV value method is used to simplify the network structure ,and the method of genetic algorithm is employed to optimize the neural network to improve the accuracy of the neural network model to predict the dosage.

There are some questions such as the short operation life of the nozzle and the water-cooling wall was burned out in industrial production. In order to better understand the coal gasification performance, we numerical simulated the GSP gasification process based on Euler-Lagrangian approach. A steady three dimensional multiphase flow model was established by ANSYS/Fluent. The coupling effect of turbulent-chemistry was considered by Species Transport model. The realizable k-ε was used for the gas phase turbulence. The P-1 model was implemented to radial heat transfer. The DPM model was applied to coal particles motion. The numerical results obtained a “∧” shaped flame is in the gasifier, syngas is mainly located in low temperature region and its concentration gradient is larger in the vicinity of flame. Meanwhile, The comparison between the numerical results with actual operating data shows favorable agreement. In addition, the numerical results obtain temperature of the exit was slower than melting temperaure of ash, satisfy the requirement of liquid slagging. It has a certain practical significance for study of pulverized coal gasification process.

For the lignite containing a large number of hydrophilic oxygen functional groups and bad floatability, this paper took the method of low-temperature pyrolysis on lignite to research floatation characteristics of pyrolysis semi-coke by low-temperature pyrolysis. The results showed that it would be reverse floatation with bad floatation effect of semi-coke when the pyrolysis temperature was below 450℃. The reverse floatation disappeared at pyrolysis temperature 450℃. With the pyrolysis temperature increasing, floatation effect turned better obviously. The floatation effect was the best, which combustible material recovery reached 72.61% and floatation perfect degree reached 23.47%,at pyrolysis temperature 500℃ with kerosene dosage of 2kg/t and 2-octanoldosage of 0.3kg/t.

In the coal slime flotation process, manual dosing leads to the problems of strong randomness, high reagent consumption and high labor intensity of workers. In this paper, a new method based on least square support vector machine (LS-SVM) for the predictive control of flotation reagents addition is proposed. The main process variables are selected as the input variables of the LS-SVM model, the reagents dosage are the output variables. Meanwhile, the particle swarm optimization algorithm (PSO) is used to optimize the internal parameters of the model and the simulation is carried out. The application on the Hong tong coal preparation plant shows that: under the premise of ensuring the product quality, the system can effectively reduce the reagent consumption, in which the collector consumption is reduced by 13.73%, the frother consumption is reduced by 12.67%, the model shows good performance.

The load in the process of construction is mostly a linear or approximately linear loading level; the settlement time curve has the characteristics of "S" type. The paper mainly studied the application of the WEIBULL curve and improved POISSON curve model in the settlement regularity and prediction of the whole process of CFG the long-short-pile composite foundation, got the optimization iteration method for solving the model parameters, combined with Seoul garden engineering project application, the result indicates that the two models have high accuracy for the whole process of composite foundation settlement fitting, which can meet the needs of the engineering application, improved the POISSON model is slightly better than the WEIBULL model.

Abstract: Taking Huainan as an example, according to the datas of energy consumption and vegetation from 2002 to 2014, carbon footprint, carbon carrying capacity and other related characterization indexes were analyzed in order to provide a basis of decision-making for the related parts of government about environment. The results showed that the carbon footprint of Huainan had been steadily increasing at a high value, which indicated energy consumption discharged vast quantities of the greenhouse gases; The carbon carrying capacity was quite small, especially in recent years, so the carbon deficit presents with severe situation; The intensity of carbon footprint had been decreasing that indicated a higher and higher efficiency in energy utilization with the continuous development of science and technology; The carbon pressure index was still high，as well as the per capita carbon deficit and the per area carbon deficit at a higher value; The per capita net carbon footprint and the net carbon footprint density of Huainan were higher than Anhui, and the intensity of carbon footprint and carbon pressure index gradually was approaching and then was under Anhui in recent years. The government of Huainan, in general, made some achievements, but still has high pressure.

Abstract: In order to reveal and solve the large deformation of sensitive coal sides in high sides, dynamic pressure and gob-side entry retaining roadways, failure mechanism of coal sides in Huoerxinhe model was compression-shear failure under surroundings pressure, strong shearing zone in four corners and “C” shearing belt in sides. Top coal slipped inclined and largest deformation appeared in the middle of both sides. Hierarchical support was put forward, who means rock blot cooperating cable or injecting cable. Site experiment was carried out in west auxiliary transportation roadway. Monitoring data showed that side cables controlled the shearing slip of top sides; supporting effect was good with small deformation and roof separation.

In allusion to the issues of low efficiency in cutting coal partings using thin coal layer shearer, a new ladder drum is put forward. And for the analysis of cutting performance about the new ladder drum, a simulation study of coal and rock cutting between traditional drum and the ladder drum with LS-DYNA is carried out, in this research, the analysis object is the cutting and feed torque of traditional drum and ladder drum while cutting coal and rock. Research results show that the cutting and feed torque of ladder drum is less than traditional drum when cutting coal and rock under the same cutting efficiency, but except the first knife, which indicates that cutting performance of the ladder drum is better than traditional drum and provides a reference for the design of new type shearer drum.

Belt conveyor is an important equipment of coal transport. In this paper, through the analysis of the mechanical analysis of the adhesive tape transport system, the factors that affect the power of the belt conveyor are obtained. According to the characteristics of nonlinear, time-varying belt conveyor, belt conveyor simulation device by using fuzzy -PID control system design theory of belt conveyor, according to the filling rate of coal, realize the speed regulation of conveyor belt, and real-time monitoring by PC software FactoryTalk View. The results show that the system can adjust the belt speed of the belt conveyor according to the filling rate of coal, and the energy-saving effect is obvious.

In this paper, we investigate the latest performance of coal resource tax reform in China that is implemented in December 2014. The main findings show that the coal resource tax reforms among six provinces have great differences in such aspects as tax rate setting, washing coal conversion rate, tax incentives and coal-related fee charging. Further, we put forward three policy suggestions to improve the coal resource tax reform in China, including that carrying out floating tax rate linked with the market price of coal, establishment of reasonable discount rates and inventive measures, forming a long-term effective mechanism of regulation in clearing up coal relevant charge.

Abstract: Based on the advanced practice and successful experience of Shendong’s specialized production services and Tiandi Huatai’s operation service, counseling concept, function, work content and character of mine construction management are summarized and analyzed. And it also condenses counseling idea of mine construction management. With mining composite service theory, component theory and project management theory, it constructs the counseling pattern of mine construction management and parses the service connotation and types. Besides, it divides service product components of mine construction management, and analyzes resource allocation of service product components. The research results could innovate business model of coal industry and offer a new development direction for the transformation and upgrading of the industry. Meanwhile, it could effectively reduce operation cost and improve economic benefit. In addition, the results provide a strong theoretical guidance to production and management of construction and reconstruction coal enterprise. It has important practical significance for the innovation and application of coal industry’s production and management.

The coal enterprise safety climate has a prominent place in safety behavior of workers,this study put forward new measure index system of the safety climate and safety behavior,separated the safety climate into two dimensions：safety attention and safety management,then using regression methods to analyze data from the Shandong Province 7 coal miners,1222 copies of questionnaires,verified the positive relationship between safety climate and safety behaviors.The research results show that the safety climate has a significant positive impact on the safety behavior.The research conclusion has a theoretical reference value for the coal safety management.