For the complex geological conditions in the north part of Chensilou coal mine, which forms the natural graben by F18 fault and F13 fault, the paper puts two schemes which technically feasible and economically rational according to distribution principle of the mining area. After a detailed analysis and comparison, the paper determines the optimal scheme by using the existing system arrangement of production system in the mine of the north east wing, the scheme of engineering quantity is little, short construction period. And the initial investment is little, valuable. In addition, the scheme is conducive to mining succeed, mining series ventilation preparation time which is short, small range of normal mine production, less effect. The scheme is to be provided reference for design of mining scheme under the similar geological condition.

For Tashan coal mine, Coal Seam #5(3-5) belongs to Permian-Carboniferous ultra thick coal seam. With mining in the overlying Coal Seam #2, more concerns are pulled for mining activity of underlying coal seams. This article focuses on fully-mechanized workface with top coal caving in the ultra thick coal seam, and analyzes caving ability and characteristic of top roof coal as well as the selection and calculation for mining equipment in the working face. It is determined on the issues of the feasibility of top caving mining method in ultra thick coal seam, and corresponding parameters of working face design and mining equipment selection. The article could provide practical reference for future similar working face mining design.

This paper, by referring to steam-coal market status and higher requirements by the environmental authority for steam-coal cleaning, researches into a few of cost-effective and workable techniques, which are based on fines removing before coal washing. Through analyses in the principles and structures of core equipment and in the onsite usage of various equipment, those fines-removing-before-coal-washing techniques are preliminarily regarded as more capable than currently popular techniques, like rock removing from lump coals or full coal washing, to enhance product quality, reduce coal slime, and thus to boost the economic benefit to a steam-coal cleaning plant.

For the current exploration of coal mine safety and coal mining, we designed a Ground Penetrating Radar receiver system which could survey the coal seam thickness and other media around. After receiving signals by the aerial at the front end of the system, the low noise amplifier could be used to amplify the signals. Then high-speed sample would be taken to complete the data acquisition. The data processing could be finished in Altera’s FPGA development board Cyclone IV. LMS method in self-adaptive algorithm could be used. This receiver system can be applied in coal mine exploration area, the data of coal mining area can be obtained through advanced detection. In this way the safety of coal mining can be guaranteed and the production efficiency can be improved. for future advanced detection of coal mine has great actual application value.

Powdered Coal Preparation System, as a manufacture assistant system, has been extensively used among power plants, cement plants and steel plants. With the increasing number of projects of combusting the powered coal, the demands of powdered coal products have been largely increased. In 2012, the established SCCIG Shenmu Zhangjiamao SWS Plant had put into operation, which is the first and also the largest powdered coal preparation plant in China. The EPC of plant was operated by CCTEG Beijing Huayu Engineering Co., Ltd. Powdered coal is easily turn to spontaneous combustion or explosive under certain conditions. The finished powdered coal must to be collected by the bag dust collector. Compared with power plant and steel plant’s combusting the finished powered coal directly, it is more dangerous to collect the completed powered coal to the completed products warehouse. After knowing the design of SCCIG Shenmu Zhangjiamao SWS Plant and visiting some power plants, steel plants and cement plants, this article summarizes some experience of designing a safe powered coal making system.

Common loading station building shape is mostly regular structures, with the development of industry and market. The process required to achieve the bottom column net less and the upper column net more,for the problems of the vertical lateral force resisting members discontinuity. Combined with the practice of Zhuhai design and application of loading station truss.,researching and analysing the force characteristics of conversion layer in the complex conditions of loading station .The results show that the design method is feasible and can provide reference and experience for similar engineering design.

In order to analyze the safety of the outer wall of Yang Village coal during freeze sinking method, the monitoring work were carried out on the stress and deformation. Through the 346 m and 387 m levels monitoring results showed that, after concrete pouring for 7 to 10 days, the freezing pressure in deep clay layer rapid growth, and then increased slowly. The relations with the freezing pressure monitoring value and depth（H）of two levels were 0.0107H and 0.0109H . The outer wall ring to the stress of steel bars and concrete circumferential strain is mainly controlled by the freeze pressure, and the stress showed pressure. Two levels of maximal stress of circumferential reinforcement pressure were -212.6 MPa and -147.5 MPa, and concrete circumferential strain were -1655με and -1170.5με.These were all less than design value, so the outer wall was in a safe state. The outer wall of the vertical stress and vertical strain of reinforced concrete is mainly affected by the cooling rate and the frozen wall confinement, etc. When shaft sinking, keeping the shaft lining’s temperature reaches the design value, reducing the effect of frozen soil displacement and temperature stress constraints, that can reduce the circumferential crack. So it is advantageous to prevention and control water duiring the work.

In order to solve the serious problem of support technology of large section roadways in deep three- soft coal seam,in combination with the practical situation of working face in Renlou Mine and failure reasons of the original roadway supporting, composite reinforced supporting technology solutions of Initial high- performance bolting、neting and shotcreting and secondary bolting and grouting was proposed,the detailed technical parameters were given in the surrounding rock control technology.The field monitoring and data statistics indicate: the new supporting technology plan has better obvious effects,the maximum roof-to floor convergence was 65mm，the maxinum rib-to-rib convergence was 43mm,the average speed of roof-to-floor was 1.3mm/d,the average speed of rib-to-rib was 0.86mm/d,the deformation of roadway was controlled effectively,satisfies the requirement of roadway support.

Based on No.5 coal seam of Changxing coal, the parameters optimization of bolting in mining coal-rock roadway under shallow overburden have been studied by using numerical simulation and underground test. The supporting effect of three different programs have been contrastively analyzed by FLAC3D, and a reasonable bolting row & line space was determined. The research show that: bolt density can be reduced by increasing bolting pretensioned stress; when the pretensioned stress is 30~50% of bolt yield stress, the bolting row & line space can increase from 0.8~1.0m to 1.0~1.2m for the mining coal-rock roadway under shallow overburden. Underground test show that：a value of 1.2m is reasonable for the bolting row & line space in Changxing coal, and it can guarantee roadway safety.

In order to decrease the effect of blasting vibration on the surrounding residents and buildings, the method of millisecond blasting is adopted on the open cut mining. The test used high precision fuse blasting cap for the sake of the precision of the common detonators can’t meet the requirements of millisecond blasting. Based on the results of in site monitoring, this paper compared the peak velocities and duration of the blast used the high precision fuse blasting cap to the general blasting’s. Regressive analysis was made by using the Matlab software. The research shows that the vibration strength and duration in the blast using high precision fuse blasting cap decreases compared with the general blast’s, and the effect of decreasing vibration is reduced when the blast center distance increases.

To study and master the behavior and characteristics of mine pressure in mechanized coal face of large mining height during end-mining and ensure equipments rapid retracement, this research was made on the governance practices in 3101 working face, combined the theories and field measurement, in order to determine reasonable yield mining position and mining plan, the effect of different mining velocity on the effect of pressure characteristics were analyzed and the support scheme was designed. The study result shows that it could increase weighting distance and sustain length significantly by accelerating mining velocity, while the loading distribution and dynamic load coefficient of the powered supports were influenced less. It could control weighting position ,increase weighting distance and sustain length effectively by using yield mining technology. Reasonable coal pillar length of yield mining could make sure a mild roof strata behavior when Hanging nets, cut-through and equipments retracement. The effect of mining pressure on roadway deformation could be mitigated by using supplement support technology. The researchers have devised a provide a references for safety production and rapid equipments retracement in mechanized coal face of large mining height during end-mining.

Based on the practice of gas control engineering in low permeability thin seam, according to the introduction of advanced technology, to build the technology system of gas control and increasing the investigation of gas control engineering, and using the coal seam, high drilling, down drilling, on the corner drainage pipe and drainage of goaf comprehensive gas control method for a variety of extraction methods drainage effect analysis, to determine the characteristics of the various extraction methods and drilling layout parameters. Gas control in adjacent layers is key in the mining process of thin seam, so that gas extraction accounted for more than the entire face amount of 70% of gas emission, gas drainage pumping station concentration is maintained at 21 to 25 percent, the methane concentration workface is reduced to 0.35% or less, a strong guarantee for the safe production of the mine.

In the view of low water component, low porosity, poor wettability and severe dust production characteristics of the No.2 coal seam in the Wang jialing coal mine, According to the coal seam drilling conditions , one-way long borehole water injection method decorated in the return air lane and the dynamic-static pressure water injection system were chosen to governance this hazard, and the technical parameters of coal seam water injection were determined Combined with the pre-injection test results. Then the investigation results show that the average water content of the coal can be increased by 1.04% after water injection, the total dust and respirable dust suppression efficiency can reached 36.7% and 31.5%.

Chensilou coal mine 21401 fully mechanized working face showed monoclinal structure, two-roadway fall head nearly 57 m, the average slope of workface is 16.5 °. Through the multi-angle analysis of the reasons and harm of flying and down sliding, targeted put forward the technical measures to control the scraper conveyor flying and down sliding,ensure the safety and high efficiency of coal resources. By summarizing the relevant experience, for fully-mechanized face under similar conditions to control the scraper conveyor flying and down sliding to provide good technical support.

Aiming at the closed fire-area of gas outburst mine , because of long tine and wide range closure, large amounts of high concentration gas accumulated in the enclosed space, which should be released first before opening the fire-area. In order to guarantee the safety and high rate of high concentration gas emission, gas drainage system was applied for drainage of closed high concentration gas, and nitrogen were injected into the closed area for the replacement of high concentration of gas, moreover, CH4, CO and online temperature monitoring probes were set in gas drainage pipe, to control the development situation of the fire in real time, and provide technical support for the safety of gas drainage and fire area opening.

To effectively reduce the pollution of coal gangue on the mining area environment, combining with engineering examples, analyzes the governance of coal gangue piles and recycling use gangue environmental benefits of the mining area, respectively. The results showed that through the way such as making brick, making cement, power generation of comprehensive utilization of gangue, these could effectively reduce the waste rock 's stacked and discarded .Then reduce the pollution of the environment of the mining area that bring by coal gangue, fundamentally have played an important role in protection of the mining area environment, promote the mining area to the road of green-production.

This article mainly aims at Chen Silou coal mine belt conveyor the defects existing in the operation process, put forward the targeted belt conveyor frequency conversion reconstruction scheme, a new integrated control two motors, has certain reference value for the modification of the old system, and obtained the practical application in the actual production, has been clear about the belt conveyor running its excellent frequency control of motor speed and the braking performance, and many other advantages, improve the quality of the underground transportation, reduces the incidence of belt conveyor system fault, achieved the purpose of safe and reliable transportation, and points out the importance of frequency conversion technology in the modernization of the mine production.

To study the mountainous terrain of the expected impact of mining subsidence, according to the particularity of loess mountainous terrain, the unit volume deformation of slope under the condition is decomposed into incremental deformation normal underground volume deformation and the plastic slip caused by volume, and then use the relevant expected Additional models will affect the hillside slippage results with conventional mining subsidence superimposed, mountainous terrain as mining subsidence expected results. Through research and analysis, the impact of loess slope slip mountainous terrain conducted in-depth discussion of the theory. And conducted face Tongchuan Mine Y905 as an example to validate the theoretical analysis results match the actual measurement data, confirmed the hillside slippage in considering the impact deformation of surface subsidence, with its superimposed manner expected, more suitable for the western loess mountains mining subsidence prediction.

Locked sand mined in Pattison mine has very unique properties: very high friction angle and very low cohesion. Wilson theory on pillar design takes properties of pillar material into consideration. Analysis shows that friction angle has great effect on strength of pillar. Based on the analysis of problems of Wilson theory, improvements are made on the calculation of yield zone width and the load which pillar can take. Results calculated with parameters of Pattison mine show that the width of yield zone is 0.2m, the load which pillar can take is 7.4×109 N, while the load which pillar will take is 6.8×108 N. This means that the size of pillar still has a room to be minimized in order to raise the extraction ratio.

In order to improve the control of gas outburst, and to resolve the contradiction between high yield and high efficiency and the constrains on succeeding of extraction, drivage and mining, the paper analyzed the storage and production characters of the coal and gas in Gujiao Coal Mining Area, summarized the simultaneous extraction of coal and gas modes of Huainan, Jincheng, Songzao and Pingdingshan Coal Mining Area and their technique features, and demonstrated the applicability of the simultaneous extraction of coal and gas modes or experiences in Gujiao Coal Mining Area. The paper also optimized the succeeding sequence of extraction, drivage and mining, as well as progressive modularization pre-drainage range of contiguous outburst coal seams of Shanxi Group, and proposed a three-region linkage coal and gas compatible mode in Gujiao Coal Mining Area.

Aiming at solving the shortage of method in select the model of coal and gas simultaneous mining, the new idea of fuzzy analytic hierarchy process, which is designed to select the model of coal and gas simultaneous, Base on the basic principles of fuzzy analytic hierarchy process, 5 factors which influence the model selection such as geological factor, safety factor, technical factor, resource recover, economic benefits are confirmed, as well as 21 sub-factors, according to Coal 3 in chengzhuang mine. What’s more, the weights of the factors are determined by using FAHP . The selection of coal and gas simultaneous models in chengzhuang Mine are based on fuzzy comprehensive evaluation, the results show that simultaneous drainage of ground and mine in single seam is the best selection.

Based on the problem of non-recovery, high cost, a waste of time, laboriousness, low efficiency and so forth which existed in the current domestic existing technology of hole sealing for gas drainage, the device of recyclable and rapid hole sealing by high-pressure expansion has been developed through theoretical analysis and repeated test. Field application and observation showed that the device which is easy to operate and can be reused by multiple drilling is able to provide large enough hole sealing pressure and high safety. The drainage concentration of the gas in the coal seam has increased by 40% to 60% when compared with traditional technology. Thus, under the premise of workers' personal safety, the effect of hole sealing and efficiency of gas extraction can be further improved. Promoting this technology can reduce the production cost greatly.

The seam deposit features of Bulianta 12407 coal mining face were analyzed and the 3D geological model of the coal mining face was established by using the FLAC3D software, overlying rock movement and damage occurred by the coal mining operation is numerical simulation. The paper analyzed the displacement and stress distribution law of the strata above seam during the coal mining process and had a discussion on influence of different ratio of sand and bedrock on overlying rock movement and damage, that can forecast damage extent of the overlying rock in the mined-out area, and we can take measures to prevent to sand inrush and water inrush in the working face and protect plants on the surface.

Based on the stress relief measurement data of Huaibei coalfield, the distribution law of in-situ stress in study area is obtained. The results point out that: the change trend of each principle stress all increase with depth, the optimal direction of maximum horizontal principle stress is NEE. According to spatial value relationship of three principle stresses, the type of Huaibei coalfield belongs to dynamic stress field. The data from evolution of stress field and focal mechanism solution show that it is a tectonic stress field in a horizontal compression located in NEE and horizontal tension located in NNW. Through the analysis of regional tectonic evolution, EW and NNE directions’ structures formed the earlier coalfield’s structure, SN and NWW directions’ structures formed the later. Meanwhile , reverse faults formed in early transformed normal faults. Different tectonic stages bring up the modern tectonic framework in Huaibei coalfield.

Due to a few changes in the electric unit pump system of the original mechanical fuel injection system of diesel engine structure, with relatively low demand for fuel quality, and with stably mission, it is suitable for the flameproof diesel engine. With the explosion protection system introduced, the performance of the electronic control unit pump diesel engine is reduced, and the emission is increased. In which an average of 6.06% of the torque is fell, and an average of 8.28% of the power, and the fuel consumption rate is increased by an average of 2.67%, and CO is increased by an average of 170%, and NOx is increased by an average of 7.78%. There is little influence on the fuel injection quantity and injection pressure of the electronically controlled unit pump diesel engine with fuel injection timing by AMESIM simulation model. The injection timing characteristics of the electronic control unit pump fuel under different rotational speed is used for the reasonable matching in fuel injection timing and injection pulse width, to some extent, which compensate the loss of the performance in the working conditions after the explosion-proof system added in the electric unit pump diesel engine, as well as the emissions improved within a certain scope, and the best matching point of the torque working condition and the rated conditions obtained.

In order to disclose the mechanics of heat and mass transfer between mine return air and water in mine return air shower heat exchanger (MRASHE), firstly, heat and mass transfer theories between air and water are employed to identify the changing process in mine return air and droplets states under the operating conditions of heating. And then, mathematical model of heat transfer efficiency of MRASHE under the operating conditions of heating is developed based on the heat balance equation of air-water heat transfer, and the overall and general heat transfer efficiency models in the process of cooling and drying process, which is very significant to guide the design and operation of MRASHE.

Abstract：Coal is one of the power of social construction and development of the main energy source, but the problem of coal mine safety can not be ignored. The analysis shows that coal mine accidents in recent years, the voltage stability has become one of the factors that threaten the safe operation of coal mine, so to solve this problem is to brook no delay. Using the electric spring adjustable voltage amplitude characteristic, can ensure the voltage stability of electric equipment in need of protection, so the voltage quality needs strict power equipment can safely and effectively under the rated voltage of the work, so as to provide a reliable guarantee for the safety production of coal mine.

The Yuqia coalfield Jurassic abundant coal resources, had great potential for the formation of coalbed methane reservoirs..In order to study the controlling role of sedimentation to the CBM reservoir in Yuqia coalfield,according to the research on the Yuqia Jurassic sedimentary system, sedimentary facies and sedimentary microfacies,this paper discussed the control of different sedimentary systems and sedimentary microfacies on coal roof and floor closure performance and the effects of different depositional systemthe on the spatial distribution of coal reservoirs.The results showed that: in different depositional systems, coal reservoirs and roof and floor constituted different combinations relations with different capping performance for the CBM reservoir;the lower delta plain facies in meandering river delta sedimentary system and shallow lacustrine facies in lacustrine depositional system were the most favorable coal-forming environment and beneficial to accumulation of coalbed methane reservoirs;the capping layer formed in bay marsh microfacies was more conducive to preservation of coalbed methane reservoirs than in between bay marsh.

With such advantages as low fluidization velocity, wide application range and so on, the vibrated fluidized bed has a further application in coarse particle processing. Due to experimental limitation, its basic theory is not perfect. This paper give a experimental category overview on fluidized bed drop, fluidization velocity, bed uniformity and segregation pattern of monodisperse, binary and polydisperse coarse particle mixtures, give a introduction on CFD simulation study dynamics, and point out its future development trends: the basic theory research on fluidization, mixing and segregation characteristics of actual fluidized bed made of heterogeneous mixtures, especially the stability control mechanism on fluidization flow diagrams, critical conditions of phase transformation.

A large amount of semi-coke powder produced by the semi-coke industry in Shanbei has been used as a fuel for civil use. Based on the briquetting-coking process and the experiments of making formed-coke for gasification by using semi-coke powder from Shanbei mixed with coking coal, the effects of the proportion of fat coal or 1/3 coking coal to the formed-coke quality are researched. The effects of several binders to the formed-coke are also discussed in this paper. Semi-coke powder with fat coal or 1/3 coking coal can produce formed-coke with high quality for gasification.

During coal pyrolysis, a certain percentage of each element(C,H,O,N,S) will be transferred from raw coal into pyrolysis products, in this paper Dayan coal is heated at the atmosphere of N2 in the fixed bed at the low temperatures and heating rate in order to get the transferred ratio and then research the transferred law quantitatively, which can be applied in the stage of pyrolysis of UCG equilibrium model and predict the yields and components of the syngas and contaminants in the outlet hole. The results show that: when the end temperature of pyrolysis increases, the transferred ratios of each element in the ash and gasification carton decrease, but the ratios of the pyrolysis gas raise, the linear relationships exit between the end temperature and a(C,CH4/CO2/gasification C), a(H,CH4/H2), a(O,CO/CO2), a(N,HCN), a(S,COS), the changing rates for above are as follows: 0.0078%/℃, 0.0076%/℃, -0.0279%/℃,0.0571%/℃, 0.0528%/℃,0.0573%/℃, 0.0825%/℃,0.0087%/℃,0.0067%/℃；the maxima of the transferred ratios for each element (C, H,O,N,S) in tar turn up at 600 ℃,which are 10.36%、19.58%、4.03%、6.11%、6.30%；the maxima for each element (H,O) in pyrolysis water turn up at 700 ℃，which are 26.55%/℃,55.65%/℃.

Abstract: Shenfu coal is difficult to prepare high concentration and low viscosity of coal-water slurry (CWS) due to its high fusinite content, high internal water and high oxygen content. The report used the percentage of ultrafine pulverized coal (d50 =8μm), the content ratio of two kinds of ultrafine pulverized coal (d50=6.5μm and 4.5μm) and the dispersant compound ratio as three factors to design experiment with Box-Behnken. The regression equation about the constant viscosity concentration was obtained and analysed via variance analysis. Through response surface methodology, the factors effecting on the constant viscosity concentration of coal water slurry were analysed and optimized. The results shown that, the optima formula: the percentage of 8μm was 70%，the content ratio of two kinds of ultrafine pulverized coal was 1.44 and the dispersant compound ratio was 0.33, and the predicted concentration was 59.09%. Based on the optima formula, the concentration of coal water slurry was 60.29% (approximately to the predicted concentration) through testing when the viscosity was 580mPa﹒s. In addition, the stability and rheological property of coal water slurry were improved significantly after optimization.

Through the comprehensive considerations of the use conditions and maintenance level, This article analyzes the support structure of ranging arm planetary mechanism of the traditional use and the current use, and proposes the new support structure of ranging arm planetary mechanism of thin coal seam shearer. this article discusses the key technology points of the new support structure of ranging arm planetary mechanism of thin coal seam shearer,and provides the technical basis of the new support structure of planetary mechanism, in order to achieve better use and promotion

In traditional sense,fully-mechanized working equipment consist of Coal winning machine,Scraper conveyor,reproduced crusher,and hydraulic support.The machines are commonly known as“three machines and a support”.The machines of corollary equipment is a very important and complicated work on aspect of equipment selection.Especially in china, mining equipment manufacturing enterprises is the product of planned economy in history.Fully mechanized equipment is an organic whole.They were subjectively split into separate parts by Chinese companies.In result,this makes matching machines with difficulty and complicating equipment system.This paper puts forward a new train of thought is to redefine the mining equipment system.The purpose to change the face of coal mining equipment from the source of design thinking. A new system is built by the new process methods combined with automation technology.This complete new system is low power consumption,high automation, high safety and efficiency production for coal production system.

The finite element analysis model of rubber Y-Sealing ring is established by the finite element software. Installation mode of stress and strain distribution of the seal ring is analyzed. Analyses the stress and strain of Y-Sealing ring under different loads and different compression ratios. The stress and strain under different compression ratios and loads are calculated by finite element software. The regularity of seal between compression ratio and load is obtained by the analysis and contrast to different stresses and strain contours. The optimization analysis was carried out on Y-Sealing ring for the purpose of avoiding the lower lip is packed into the clearance. The sealing structure finite element analysis can do certain theoretical reference value to the design and installation of the seals.

The raise of management error-proofing is a major change in management philosophy. Error-proofing in quality management system is essential to ensure the smooth conduct of quality management activities. It helps to reduce the potential risk of enterprise quality management, coordinate relationship between quality management activities and enterprise’s daily operations and improve robustness of quality management. Starting from the generation mechanism of management errors, the paper reveals the connotation of the quality error-proofing and its key elements. Based on the view of system and integration, the paper builds a conceptual framework for error-proofing in quality management system, try to resolve the error-proofing in the process of quality management, and discuss the operation mechanism of error-proofing for quality management system.