Xinzheng Coal Company exists with a small amount of One hour of coal washing, the product of high moisture content, discharge chute blocking problems. Based on the reformation of coal slurry water system, improvement of chute and production pipeline structure, dewatering equipment, replacing the sweeper, and strengthen the management of equipment, optimize equipment parameters and other measures to make the production system of coal preparation plant gradually stable, the quality of products to meet the market requirements. At the same time, creating a huge economic benefits.

With the expansion of frequency control system application fields, in order to avoid the impact on production for high-voltage inverter instantaneous power failure, the instantaneous power failure restart technology of high-voltage inverter came into being. The key of this technology is to search the rotor frequency, so that it can be close to the inverter output frequency. There are some search modes which is algorithm complexity and less precise, so it is difficult to achieve for VVVF inverters. this paper presents a new implementation method, which use shaft encoder to detect motor speed , and the result of theoretical analysis and experimental can verify the validity of this method, so it has good application prospects.

The reconstruction technique of the system of water transportation and drainage in Kangcheng Coal Mining is researched combined with the special condition of hydrology and geology and the requirement of production. By reasonably reconstructing the system of water transportation and drainage, using submersible pumps and long-distance automatic control equipment, we successfully solved the problem of water-inrush dangerous in Kangcheng Coal Mining, ensured the safety of coal mining, received better economic and social benefits.

The special geological conditions of the deep tunnel and the deep rock which have the mechanical properties of large deformation determined the complexity of support technology in deep tunnel project. This article describes the mechanics of deep tunnel coupling support ，and the analysis of the deep tunnel coupling mechanism and states the theoretical formula determining of the deep tunnel coupling support.Through the application of xinli mine, the role of the deep tunnel coupling theory is technically reasonable, safely reliable, economically reasonable, which basically reached the expected goals.

In order to solve floor heave problems of chamber with associated with deep high-stressed soft rock in Panyi Coal Mine East, according to engineering geological condition of waiting chamber, Combining with numerical simulation in computer, Based on pouring concrete in roof and straight-wall, the strengthening scheme that combining Overbreak Back-filling and deep-hole cable routing to strengthen chamber floor is proposed in this paper. Numerical simulation and field experiment show that the stability of chamber floor is improved and the floor heaver of the soft rock chamber is effectively controlled with this scheme.

the depth of the bottom of one shaft walling crib in east gansu province is 886m.the freezing shaft sinking had to be used as the heavy water inflow happened at 472m with general sinking. Taking the affection of the freezing to the existing shaft in to account, The designer set a series of temperature controlling hole inside the freezing hole. The author simulates the freezing temperature field of 0m to 472m with two-dimensional model at typical layer, anlysis the rationality of layout type and parameter of temperature controlling holes, the results provides theoretical reference for the engineering design..

Based on the closed distance coal seam group high combined mining in Hedong coal mine of Shanxi Fenxi Mining Group, using the finite difference program FLAC3D, the paper calculates and analyzes the stress，deformation and failure characteristics of a roadway with special thick sandwich，hard roof and large section witch is in the excavation period. After the study, surrounding rock stability control countermeasures of this type of roadway are proposed that provides scientific basis to for the support parameters Design. The research outcomes have been testified on-site and applied at the haulage roadway and ventilation roadway of 391008 working face in Hedong coal mine.

In this paper, such as shaft construction through the soft sandy clay soil easily occur roof fall in the accident situation, to break the routine, the original patent and the power law of the State based on the re improvements to improve, to better solve the above Well established domestic problems.

Abstract: According to the problems of working face equipment and roof management in high inclined “three soft” seam,which was located in 22031 working face of Lugou mine. Measures to prevent rib spalling , support and scraper conveyor sliding and coal waste rolling were proposed.The practice points out that the safety of mining could be ensured and achieved remarkable economic benefit by taking these measures.

Introduced the importance,necessity and situation of study of pumping gangue backfill.and current representative of gangue backfill technology. to HuaHeng Mining 41302 East Pumping Waste pillar coal face gangue backfill, for example, introduced the pumping waste rock Paste-like backfill process and process technologies, and the filling effect and efficiency are analyzed. Pointed out that China's backfill mining method remaining problems. Pumping gangue backfill has become the coal mining industry the best way to green, with excellent promotional prospects.

This article analyzed the programming,main content and preparation points of the comprehensive excavation face operating procedures,Based on 《Coal Mine Safety Regulations》、《Types of procedures》design documents 、higher production of technical documents and actual site conditions，it discussed the methods and specific requirements of preparation of comprehensive excavation face operating procedures，Proposed problems and response measures，Having a certain reference for preparation of comprehensive excavation face operating procedures.

The article aims at production geological conditions of 2 coal seam merger area of Shan Jiaohe Coal Mine in Huo Zhou mining area, observes mineral pressure of the 504 large mining height fully-mechanized face, and deep analyses the pressurized regularity of shallow overburden large mining height workface, working resistance of support and characteristics of rib fall of coal wall. The results show that the periodical pressurized distance of coal mining face is average 14m, and the dynamic load coefficient is 1.13. the working face exhibits small-scale rid spalling during the recovery, especially for the end. ZY7600/26/55 type double column shelter support could meet the requirements of the production.The measured results have momentous practicing meaning for coal seam mining rock surrounding control and the prediction of pressure step under the same conditions.

Based on the law that the gas emission rate is constant per minute when the length of roadway is constant, a gas emission rate、gas and oxygen concentration method is put out in gas Suffocation accident cognizance, aimed to the gas accident occurs in coal raise and none gas measuring data. It provides accordance for gas Suffocation accident cognizance.

An observation station of surface movement is established to study the fracture mechanism of air return way of ventilation shaft in Niuxi Mine. The results show that the primary reason leading air return way to failure is the uneven settlement of artificial filled ground, the immediate cause is the insufficient bending and tensile rigidity in brick masonry wall of return airway, and the potential dangerous element is the landslide caused by the infiltration of surface water. The measures to prevent the air return way from rupture should be considered these factors as mentioned above.

Abstract:Besign of Bolting support system is used the theory of bolt supporting , according to cancel injection coagulation after the moderate stable rock supporting roadway in surrounding rock stress analysis, thickness calculation about loose circle of surrounding rock. To the system reliability analysis and mine pressure observation shows that: it can guarantee the stability of roadway to the design bolting system and selecting support parameters and the design is reliable.

The coal seam in the inner mongolia region is deeper than shallow coal seam.In order to study the movement Rule of Overlying Strata in the mining process,this paper uses two methods which are theoretical analysis and field observation to analyses on Caving Extra- thick Coal Seam of F6201 work face. According to the reserch, the main roof (inferior key strata) of F6201 work face is the step beam, taking on sliding instability;the breakage of primary key stratum lags behind the the main roof,also taking on sliding instability.Becuse the breakage of the two types of stratums doesn’t occur at the same time, weighting interval of work face has different distances.

Coal-mine accidents are divided into roof, gas, mechanical and electric, transportation, shooting, water damage, fire and other accidents. Based on the coal-mine accidents statistic data occurred in the Eleventh-five Year Plan, the paper analyses the statistical data with grey correlation analysis. Through calculating the grey correlation degree it gets the same result with the charts and statistic that roof, gas and transportation are the main types of coal-mine accidents, which causes most casualties of coal-mine accidents. The paper offers a new way for the application of grey system in the field of coal-mine safety administration.

Aiming at the problem of deformation and failure of main return airway in Yu-Shu Mine,based on results of mineral composition analysis of the roadway surrounding rock , tests on physical-mechanical properties of rock, broken rock circle measure and in-situ stress measurement. The deformation and failure mechanism of roadway was analysed and the combined support system with u-steel plus blot-net-spray-grouting was proposed. Through the numerical simulation with FLAC3D, rationality of the support design was verified. Simulation results indicates that such combined support can effectively solve the support problem of the soft-rock roadway. It has great application value.

Partial discharge is a key factor in causing failures of high-voltage electrical equipment internal insulation and age, research and application of partial discharge detection methods, timely, effective and sensitive to detect partial discharge and its strength, which is an effective method of improving the reliability of high-voltage electrical equipment's safe operation. Based on analyzing the pulse current method which is used to inspect PD signals, with analysising of the principle of PD of high-voltage bushing, and process of PD signals' transmission; designed a schematics online detection system for high-voltage capacitor bushing by using Rogowski coil. Finally, simulated examination is done. The simulation results show the designed PD signal detection unit is effective. The method’s turn to be able to detecting have effect putting up partial discharge pulse signal, accuracy height，cost low, have the fairly good pragmatism and the vast application prospect.

According to the measured results of coal seam gas of the samples from underground mine, the paper has analyzed the distribution characteristics of coal seam gas in Erdaoling mining area. The measured results show that in general gas content is high in central section and low in both ends. In the south of the coal mine area, the gas content is 1.9~5.6m3/t and the average value is 4.5m3/t. In the central of the coal mine area, the gas content is 7.5~20.9m3/t and the average value is12.6m3/t. In the north of the coal mine area, the gas content is 3.0~12.4m3/t and the average value is 8.2m3/t. The unbalance coal metamorphism is the basic condition that causes the above phenomenon characteristics of Erdaoling mining area. The strike reverse fault developed in coal seam of the central of coal mine area and Erdaoling syncline with both ends up are the key reasons that cause unbalance gas distribution.

Selecting the typical representative locations such as 3297 fully mechanized working face in Zhaogezhuang coal mines of Tangshan Kailuan Mining Company, outburst index and the level of risk with different outburst foretoken were studied. With the method of normalization, the severity of outburst consequence corresponding to kinds of outburst foretoken was obtained. And using SPSS(Statistical Package for the Social Science)‘s Logistic regression analysis，the Logistic regression equation for predicting new index with combination of point and sphere was gained. The research results showed, Logistic regression equation for predicting new index with combination of point and sphere does not only to realize outburst severity probability quantitatively，but also can improve the forecast accuracy rate whether it will have outburst or not.

Coal water slurry (CWS) was prepared using Shenhua coal blending from Shenhua Group Co. Ltd and high-concentration printing and dyeing wastewater. The slurry ability of CWS was studied and the comparison experiments were also conducted. The results indicated that the prepared coal water slurry has advantages, i.e., perfect concentration, good flow property and shear viscosity smaller than 1200 mPa?s when the dosage of coal water slurry additive (LS-A) was 0.7%. The static stability was excellent and the slurry ability showed no change when the pH value of printing and dyeing wastewater increased. The slurry was Bingham-plastic fluid and yield pseudoplastic fluid, and it had rheological property of shear-thinning, which could meet the actual needs of production and transportation.

This paper research four different metamorphic coals of Xihu lignite, Da fosi non-caking coal, YuanZhuang fat-coal, Xinfeng meagre coal,which disposed by three inhibitors of water-glass-gel, CaCl2, and gel , testing in its program temperature conditions 40 ~ 180 ℃ range CO concentration is calculated, and the critical temperature. We can get the conclusion from the results, the critical temperature produced different degrees increased are disposed of inhibitor, including CaCl2 treatment of coal samples critical temperature is highest, therefore, it can get the more effectively inhibited activity functional groups of earlier participate in chemical reaction, thus staving off coal oxidation.

In this paper, on the basis of slime sample collected from plant, by establishing the model slurry system and modifying its characteristic continuously, the influence and mechanism of five key factors including feed solid content, amount of fine clay（-0.045mm）,water hardness, pH and pharmacy system, which have influences on fine particles sedimentation in coal slurry are researched. In accordance with three evaluations index including settling velocity, supernatant turbidity and sediment flock compression the critical point of marked change of flocculation of coal slurry is identified. Relation models of settling velocity, supernatant turbidity with different factors above are established, and theoretical basis and reference for automatic control and management is provided.

The BuYi mine area is a major host coal belt in the SuNan coal field, Since caledonian tectonic moement, this area has gone through multiphase tectonic activities. Characteristics and evolution of mine area is extremely complicated. Based on systematic analysis of geological data in mine area and field survey, taking the regional tectonic evolution as the main line,from the dynamic and historical perspective, discussed characteristics and evolution of mine area and its controlling effects on deposit of coal seams in detail. The research results show that the coal seams were controlled significantly by the tectonic characteristics and evolution of mine area, including mainly distribution and buried depth of coal seams,coal structure, coal bearing property and so on.

Lignite samples were first dried using internal heating process with gaseous heat carrier in rotary dryer, and then analyzed with chemical methods, BET method and infrared spectroscopy to determine the changes in oxygen-containing functional group contents as the drying temperature was changed, as well as the changes in specific surface area and pore volume. showing the influences of internal heating process with gaseous heat carrier on coal surface structure. The experiment results indicate that content of oxygen-containing functional groups decreases as the drying temperature increases; it is mainly carboxyl groups that are removed below 280℃ while phenolic hydroxyl groups are removed above 280℃.Below 330℃, surface area and pore volume decreases as temperature increases, with a significant increase at 380℃.

In order to seek turn coal into oil for the effective treatment of wastewater, based on the the water treatment method theory, we proposed activated sludge compound solutions. The experimental result shows that effluent quality met the recycling water standards. Therefore, this technology can be used as coal turn oil industrial wastewater treatment schemes.

During the coal mine integration, there have been many small fault that affect the safety product by the ways such as methane and floods. So it necessary to study the mechanism. Because of the inhomogeneity, anisotropy and discontinuity, the mechanical property of rock masses are more complex than other materials. The rock masses are regarded as the macroscopic continuous body and the elastic-plasticity theory is adopted in rock masses analysis. The previous model of rock masses cannot disclosure the failure mechanics, which is that the initiation and expansion and interaction of micro crack form the macro broken zone and urge the failure of rock. So it is significant that the macro failure mechanics of rock are studied in the mesomechanical scale. In this paper the macro stress-strain relation of rock and shear-band evolution and failure law are simulated in the mesomechanical scale. The results show that shear bands form after peak stress and near the point of peak stress. The rearrangement of particles arising from the elastic rock deformation after loading generate local regions of stress concentration and intrigue tension oblique to the plane of shearing. Tension cracks are caused by this tension. Both tension cracks and shear cracks grow and interact each other, eventually form the macro crack bands, namely shear bands. In the shear bands tension cracks predominate. The volume expansion of rock is caused by the open and growth of tension cracks. After the formation of the shear bands, rock behave obvious fabric softening, but the rock material softening.

This paper simulated the energy saving and emission reduction in coal mine areas, with coal mine area as the study object, system dynamics as the methodology, and Chaohua mine (belongs to Zhen Zhou Coal Group Corporation Ltd. ) which has a large degree of universality as the study case. Then three main energy consumption (material consumption, electricity consumption and raw coal consumption) and five main wastes (water waste, solid waste, SO2, carbon and dust) were analyzed through the simulation results. At last, relationships between the above indices and raw coal were systematically discussed, meanwhile, main direction of energy saving and emission reduction in coal mine areas were analyzed, which both provided the necessary scientific foundation for the policy making of energy saving and emission reduction in coal mine areas.

The paper introduced the current situation and development trend of both international and domestic coal market, discussed the meaning of promoting transformation of coal transaction from traditional mode to modern mode from three levels of nation, region and enterprises and probed into the influence of logistics system on guarantee for coking coal resources.

Load conditions on the grid structure reinforcement, the construction program's choice of grid structure reinforcement force in the construction process, large deformation of a greater impact. In this paper, the load of a grid reinforcement projects, with along the length to the middle from both sides of the symmetrical construction of the reinforcement to the construction program. Using ANSYS finite element software function unit of life and death and welding rods to impose the equivalent temperature load method to simulate the load of the grid reinforcement construction process. Construction process through the appropriate stress and deformation analysis to determine the feasibility of the construction and reliability

The article first proposed GPS-RTK has been widely used, then GPS-RTK and Total Station accuracy of analysis, the GPS-RTK in the mining deformation monitoring has certain advantages. Through experiments to verify the GPS-RTK and Total station in the data mining analysis of deformation monitoring, both monitoring data with high consistency. Therefore, GPS-RTK in the mine subsidence monitoring has broad application prospects.

Abstract: Cage curtain is necessary means to prevent people falling down wells. Currently used by the mine cage curtain, because degree of automation is not high , it Increases the labor intensity of the hook worker. In response to this situation, we designed the new mining friction cage curtain through the miniature electric drum and traction rope attached on it generating friction between them to drive traction rope,thus completing the opening and closing cage curtain.Compared with the other cage curtain, the new mining friction cage is simple, safe and reliable operation, high degree of automation and reduces the labor intensity of the hook worker.

In this paper，the assumptions are given on the basis of“shallow pool theory”，deducing the minimum settling velocity formulas for slime in both cases of underflow which can not be ignored and can be ignored in thickener，and analyzing the factors which affect the minimum velocity of slime particles。On this basis，the feeding devices of the thickener are improved，changing the manner and direction of feed，increasing the thickness of the horizontal flow layer， stabilizing of the feeding flow pattern， improving the route of slime sedimentation，and effectively improving the stability of slurry particles settling velocity。

In this paper we consider routing in MANET combining with characteristics of heading face of coal mine underground. Due to the limited energy , the lifetime of network will be shorted because of heavy load and fast energy consumption. we propose a algorithm. By the algorithm we construct a multicast tree which has a source node as root and has a path from the root to every destination node, and seek a balance point in the minimization and maximization of network lifetime. Experiments show that this algorithm is very effective on saving of energy consumption and load-balance in mine underground.

In order to meet requesting of our coal enterprise's normal production, combing with the enterprise information’s demand, the Study on the Application of coal Mobile private network Based on TD-SCDMA was proposed. The study held that the application of coal mobile private network should be solved including ground and underground parts. For existing system of mine, it should make a smooth upgrade in order to achieve integrated mine communication systems and multi-service integrated platform and give full play to wireless communication advantages of mobile private network. To provide localized service scheduling, collectivize management business scheduling and warning of the wide-area scheduling. For gas, production, equipment multi-business monitoring, detection systems, it provides channels of data transmission wireless by coverage of TD-SCDMA network of underground. The controlling center of ground provides accurate position of underground’s all staff through the TD-SCDMA network and convert it into information of interest.

Abstract: with the rapid development of social economy, the fairness of social wealth distribution is being paid more and more attention; the key problems are the performance assessment of organizations at all levels and the distribution system design and study. We not only study the feasibility of evaluation index system of organization and the weight of each index, but also possess the pay distribution methods of incentive mechanism performance. This article adopt the analytic hierarchy process to study the index of the performance, and design reasonable distribution of wages model by using the weight of every level, also make the wage distribution of coal mine enterprise more reasonable, management more intensive.