The particle size distribution has an important influence on the preparation of coal water slurry（CWS）. Based on the existing evaluation model of packing density, the thickness of the water layer around the particle is proposed by theoretically calculating with the particle expansion rate. By using this method, four kinds of samples with equal packing density but different thickness of water layer were obtained by controlling the particle size distribution of a long flame coal. The coal water slurry were prepared, the concentration and stability were tested and analyzed. The results show that while the packing density is 84.61±0.05%, the concentration increases linearly with the increase of water layer thickness, but its value is distributed within 59.95±0.3%. The packing density is still effective of the preparation of CWS. The backscattering spectrum test results show that the content of free water contained in the three-dimensional structure of coal, water and dispersant formed in system increases due to the increase of water layer thickness, and resulting that the water cleavage rate increases. The migration range of the particles in the system increases, causing the aggregation phenomenon of the whole system to be aggravated, and the stability is lowered.

The paper summarizes the physicochemical properties (porous structure, surface characteristics, particle size distribution, density, etc.) of coal particles and the properties (concentration, rheology, viscosity characteristics, stability, etc.) of water quality (components, types and amounts of additives, etc.) The research progress of the impact; from the perspective of coal clean processing utilization and modern coal chemical development demand, the development trend of coal water slurry technology is analyzed, and the advanced technology and equipment in the wastewater pulping process are pointed out, and the water coal is proposed. The technical bottlenecks in pulp theory and practice analyze the research direction and development route of coal water slurry technology.

The summary report of geological exploration achievements in coal mining areas is an important basis for the General Planning Preparation. Improving the quality of summary report is conducive to the formulation of a scientific and reasonable General plan of the mining area and the orderly development of coal resources. This paper analyzes and studies the problems existing in the compilation of the summary report of the geological exploration Achievements in coal mining areas. Aiming at the main problems in four aspects, it defines the task of compilation, puts forward five basic principles of compilation, and determines eight key contents of compilation. It further analyzes the deep-seated problems that hinder the compilation effect of the summary report and affect the scientific and reasonable General plan. We suggest that the summary report should be normalized in the form of technical standards. We also proposal that the development and management of mineral resources should be reformed by effective measures, in order to ensure the reasonable scope of exploration and mining rights, avoid the incongruity between the setting of mining rights and the overall planning, and improve the exploration degree of mining areas and the quality of exploration work.

This paper introduces the problems faced by the heat source reconstruction of kouzidong mine, analyzes its engineering status, and gives its actual cold and heat load demand through calculation.Combined with the actual demand of mine, this paper puts forward the integrated utilization system of cold and heat using the return air of mine, and analyzes the feasibility of the integrated system in detail.The scheme arrangement of the system is described, the principle and process of the system are introduced, and the design flow and system composition of the cold and hot integrated system are given.Finally, the beneficial effect of the system is analyzed.

In order to solve the problem of gas overrun in coal face of high gas or outburst mine, it is a better way to use surface well to extract gas in coal face of mining area. The principle and technical difficulties of gas surface well extraction under the influence of mining are analyzed. Three kinds of well bore structures of gas surface wells in the mining area are put forward, which are: full well cementing, hanging well completion; partial well cementing, hanging well completion; two-stage well cementing, hanging well completion. The advantages and applicable conditions of three kinds of surface well bore structures are analyzed. Three kinds of protective devices for surface wells in mining areas are developed, including shear protection device, expansion protection device and thick wall rigid comprehensive protection device. It has been applied in Sihe Coal Mine of Jinmei group and achieved good gas drainage effect. Within 200m of the coal face pushing through the surface well, the net gas drainage volume is about 12000m3 / D and the gas concentration is about 85%. After the coal face is pushed 200m over the surface well, the gas drainage volume of the surface well is about 3600 m3 / D, and the gas drainage concentration is about 32.5%. In the working face 60m away from the well position, the average gas concentration of the surface well began to reduce to below 0.41%, to 0.27% on average, and to 26.5% on average, which solved the difficult problem of gas control for the working face, guaranteed the safety of coal mining, achieved good social and economic results, and had good promotion value.

This paper aims at the problems of low drilling hole formation rate of non-directional bedding drilling due to hydraulic fracturing of fractured soft and low-permeability coal seam, hole collapse after drilling, and short effective hole section of non-directional penetrating drilling, Combining the comb directional drilling technology with hydraulic jet punching technology, a set of large-diameter directional drilling technology is formed which is suitable for hydraulic fracturing in underground coal mine. Field application shows that: this technique not only solves the problem of hole blockage caused by low hole formation rate and hole collapse after hole formation, but also solves the problem of poor gas extraction effect caused by short effective distance of drilling and small influence range after fracturing, which has a strong guiding significance for gas extraction under the condition of broken soft coal seam in this mine.

Abstract: Analyzed the main influence of the support along the channel in the working face under the goaf of the short distance coal seam. Taking the WU9-10-22310 working face as the research object, combined with the field practice, the support method of "truss anchor cable + anchor net" is proposed to support the working face along the channel, and the basic parameters of the support are determined by means of numerical simulation. The support practice shows that, through the application of the support method, the amount of roof and floor moving and two sides moving is less than 1% in the tunnelling period, and less than 5% in the stoping period, the support effect is good and can meet the requirements of field mining.

In order to effectively solve the difficulties encountered in the production of roof sinking, plate helping, roof climbing, pressure frame, and inverted frame during the over-empty lane of the large mining high working face, and ensure the safe passage through the empty lane area during the mining of the working face. In view of the problems of long length, large section and parallel layout of the working face of the 5314 large mining high face of Chengzhuang Mine, the control of surrounding rock in the air lane is studied by combining theoretical analysis with field industrial tests. The process of filling overpass lanes with high water materials is proposed and applied in the field. The results show that the use of high water materials to strengthen the support for the empty lane area can effectively control the harmful deformation of the surrounding rocks in the empty lane area, ensure the safe, efficient and rapid passage of the working face through the empty lane area, and compared with the Muduo and the single hydraulic support. High water materials filling support has significant economic benefits.

Aiming at the problems of hydration heat release and local freezing mode in inclined shaft freezing, this article studied the development and evolution law of temperature field in the whole process of freezing and thawing in the auxiliary inclined shaft of Yuandatan Coal Mine, as well as the supporting mode, stopping freezing time and local freezing structure of inclined shaft, using numerical simulation and field measurement method. The main conclusions are concluded as follows, 1) The local freezing effect of using small size freezing pipe or polyurethane foaming method in non-freezing section is not ideal. It is suggested that the local freezing pipe be made into double-layer sleeve and insulation layer be set between the two freezing pipes to maintain the thermal insulation performance of polyurethane material, reduce the volume of frozen soil and reduce the additional consumption of refrigeration capacity. 2) The release of cement hydration heat in shaft lining will cause higher temperature inside the shaft lining and melting of surrounding frozen soil. It is suggested to set up insulation materials such as wood backplane or foam board between outer shaft lining and frozen soil to prevent temperature difference between the inside and outside of the shaft lining and produce temperature cracks. 3) Reasonable stop freezing time should be determined according to the increase of shaft wall strength. The research results in this paper can provide reference for the following inclined shaft freezing engineering.

In order to analyze the influence of design parameters of high directional drilling on the extraction effect of goaf, the layout parameters and extraction data of 53 high directional drilling in mine were compared by statistical method, the reasonable layout horizon and spacing of drilling were determined; taking 12311 as test working face, the pumping effect of high directional drilling under different negative pressure of pumping and borehole aperture is tested, the optimum negative pressure and reasonable bore diameter of high directional drilling are determined; the design of high level directional drilling and extraction parameters are optimized, and the extraction effect of optimized drilling field is tested and analyzed. The results show that the reasonable decorate horizon of high directional drilling extraction of 25 m ~ 45 m, horizontal distance is 20m~ 60 m, the best extraction negative pressure of 22.7 Kpa, the optimal pore size for 133 mm, the gas extraction rate increased by 15.5% after optimization, effectively reduce the return current gas concentration.

Aiming at the problem of low accuracy of fault detection by conventional geophysical methods under the condition of large burial depth, taking a mine in Inner Mongolia as an example，a methods of controlled-source audiomagnetotellurics (CSAMT) was used for exploration.. Through the CSAMT suitability analysis, field optimization test, data processing and inversion calculation, the integrated resistivity of the stratum in the exploration area is obtained and compared with the TEM detection results. The results show that the CSAMT has higher resolution and stronger electromagnetic field signal, which has obvious applicability to deep buried layer detection. The reasonable test parameters of CSAMT are determined, which are 5120~4Hz in frequency band, 32 in frequency points and 30 minutes in superposition time. The apparent resistivity of CSAMT and TEM field applications is compared and analyzed, and CSAMT can better reflect the change of coal seam dip angle and local water enrichment, and improve the degree of refinement of detection. The research results can provide technical means and application reference for the deep buried concealed structure or the enrichment fine detection of the coal seam roof.

In order to solve the problem of inrush water in the empty mining area of the sloping long wall comprehensive mining face, it is easy to form water coal, and water coal entering the transportation system is prone to mechanical accidents and even casualties, on the basis of on-site production practices. A water inrush treatment system for sloping long wall composite mining face is summarized. Through the field application, the inrush water treatment system has solved the difficult problems such as the difficulty to discharge the water in the sloping long wall comprehensive mining face, the difficulty to derive the water in the roadway in the uphill mining face, and the coal mud treatment in the lower roadway, and ensured the safety and smooth production of the mine.

In order to realize the transient electromagnetic detection (TEM) of the shallow water goaf under the low resistance overburden layer, the large transmission loop can enhance the signal, easily penetrate the low resistance overburden layer, and improve the signal-to-noise ratio of the lower data. However, the reflection signal of the shallow water goaf is mainly concentrated in the early data, and the optimal regularization parameter of the previous inversion is directly used as the back in the inversion process The model parameters of the second iteration and the constrained inversion method of controlling the step length during the iteration can overcome the disadvantage of the low resolution of the late apparent resistivity to the early signal, and realize the electrical stratification of the stratum and the spatial positioning of the goaf in the early signal. Through the establishment of the K-type geological model forward and reverse calculation, as well as the drilling verification examples, it is shown that the constrained inversion of the transient electromagnetic large magnetic moment data can realize the location detection of the shallow water goaf under the low resistance overburden layer.

Abstract: In view of low speed and large error caused by ordinary single-chip computer and non-real-time application system in microseismic monitoring equipment at present，a high-precision microseismic monitoring system was designed with high-speed ARM processor. The major MCU of the system is iMx6UL, a high-speed processor supporting IEEE1588 standard, with Linux Operating System and 24-bit AD acquisition chip. Through this system, high-speed data acquisition of magnetoelectric vibration sensor, synchronous time stamp printing and data network transmission are realized, and vibration location calculation is carried out by the upper computer.The test results show that the system has accurate data measurement and small positioning calculation error, which can meet the needs of rock burst mine.

In the process of "three-under mining" research, it is often necessary to predict mining subsidence at discrete points of surface distribution in order to obtain specific values of movement and deformation of buildings and provide basis for design of underground mining scheme and prediction of damage level of surface buildings. According to the conventional prediction methods and technical means, the acquisition, organization and modification of basic data in the prediction process are inefficient and error-prone. In order to solve the above problems, this paper proposes to create attribute workface and discrete point reference block in AutoCAD, extract and construct workface prediction parameter data file and discrete point data file through AutoLisp program, and then call probability integral method prediction program to obtain discrete point prediction results. At the same time, relevant commands such as attribute extension, discrete point prediction and drawing discrete point movement and deformation curve are developed, and the program design and software implementation are carried out.

Aiming at the feature that the mining roadway is arranged under the pillar of overlying coal seam,numerical simulation of the stress distribution in stress concentration zone of the 031604 fully mechanized caving face and the 031604 working face the roadway and coal pillars of the overlying 9# and 12# coal seams using FLAC3D numerical simulation technology,through the numerical simulation, the stress distribution law of mining face under coal pillar under overlying coal seam is studied and analyzed in detail and take targeted preventive measures to ensure safe and efficient mining of the work surface.

High intensity mining (HM) under shallow seam in a northwest China mining area is likely to develop into a overburden cutting subsidence disaster (OCSD), which poses a severe threat to the production safety and the ecological environment. To investigate the HM OCSD evolution mechanism and preventive technology, the panel 22407 in Halagou Coal Mine is used as an example, analogy simulation is employed to conduct analysis of the evolution pattern of a HM OCSD. The results show that a HM OCSD starts after immediate roof cantilever beam experiences cutting, and the overburden develops vertical cracks. As the panel advances further, the voussoir beam structure in the fractured zone becomes unstable, and the key stratum and bearing layer experience cutting, which leads to a subsidence disaster. Based on this study, a system mechanics model composed by the timber – gangue - cantilever beam - voussoir beam was established. The influence mechanism of disasters were analyzed from the overburden structure, lithology, loads and timber stiffness, weighting interval. A detailed preventive mechanism is proposed, which provides scientific support for HM production safety and ecological environmental protection.

In order to strengthen the prevention and control of mine water disasters and ensure the safe mining of the mine, based on the actual geological conditions of the 1026 working surface of Wugou Coal Mine, this paper uses the method of combining indoor similar material simulation test with FLAC3D software simulation for the problem of the work surface back-to-back to induce the activation of burst water. The activated characteristics of faults under the influence of work surface mining and coal column retention were studied. The results show that with the continuous progress of the working surface, when the dF68 fault lower plate waterproof coal column is less than 20m, the degree of DF68 fault activation is obviously increased, and the threat of surface burst water will be greater; The permeable characteristics and the retention of the fault waterproof coal column are systematically analyzed, and the minimum retention width of the DF68 fault waterproof coal column is obtained, and on this basis, combined with similar material test, numerical simulation and theoretical calculation, the comprehensive analysis determines that the width of the waterproof coal column under the DF68 fault is set to 20m. The width can further improve the recovery rate of resources on the basis of ensuring the safety of work surface recovery.

According to the poor applicability of the current empirical formula of floor failure depth in the regulations in Chenghe mining area, this paper, combined with the engineering geological and hydrogeological conditions of the roof and floor of No.5 coal seam in Chenghe mining area, makes numerical calculation and analysis of floor disturbance failure depth under the conditions of two-factor and multifactor respectively. Based on the results of numerical simulation, the fitting formulas for the floor failure depth in Chenghe mining area are obtained. And the results are compared with the measured values of floor failure depth of the 26 coal seams in North China type coalfield. The results show that the nonlinear fitting regression formula proposed in this paper has stronger prediction ability, higher prediction accuracy and smaller error range, which can meet the field needs of Chenghe mining area, and provide evaluation basis and scientific guidance for mining under pressure.

In view of the constraints caused by the special channel environment of coal mine on the target tracking of wireless sensor network (WSN) and the accuracy of measurement data, this paper designs the network topology and distributed clustering target suitable for the characteristics of underground roadway. Tracking algorithm, and based on this, the local anomaly factor detection algorithm (LOF) is used to monitor and update the wild value points existing in the measured data. Finally, the interactive multi-model filtering algorithm (IMM) is used to achieve the target state estimation. Simulation results analysis The effective balance of the algorithm reduces the network energy consumption and improves the tracking accuracy.

In order to accurately measure the dynamic tension of the wire rope, this paper introduced a system for monitoring tension online of multi-rope friction hoist based on wireless transmission. The system arranges the pressure sensor inside the gasket of the hoist rope groove, and obtains the tension signal of the wire rope by measuring the pressure of the wire rope to the gasket. The tension signal is sent to the computer through wireless transmission, and the tension of the wire rope is displayed in real time by using LabVIEW software programming. Through on-site industrial experiments, the system can monitor the tension balance of the wire rope in real time and judge whether it is overloaded. The system is easy to install, high in detection accuracy, safety and reliability.

Taking the coarse slime of Sihe Power Coal Preparation Plant as the sample, three spiral separators with the distance-diameter ratio of 0.4, 0.37 and 0.34 were designed on the basis of the traditional spiral separator. The influence of the distance-diameter ratio on the flow film thickness distribution of the spiral separator and the separation effect of the coarse slime was investigated. The results show that on the cross section of the spiral separator, the film thickness is thin at the inner edge and thin at the outer edge; the distance-diameter ratio has a great influence on the film thickness; the distance-diameter ratio of 0.34 is bigger than that of the inner edge, and the distance-diameter ratio of 0.4 is bigger than that of the outer edge; for coal samples with particle size ranging from 1.5 mm to 0 mm, the separation effect of the spiral separator with the distance-diameter ratio of 0.4 is better.

Coal gasification wastewater has complex pollutant components, high COD values, and contains a variety of toxic and hazardous substances. The problem of coal gasification wastewater treatment has always been one of the important issues in the development of China's coal gasification industry. In this paper, the adsorption of organic matter in coal gasification wastewater by Shengli (SL) and Zhaotong (ZT) heat treated lignite (TTL) was studied. The results show that the residual moisture in the two TTLs has a great effect on the removal efficiency of COD, and has a negative correlation with the effective adsorption pores. The SL TTL adsorption effect is significantly better than ZT TTL. SL TTL heat treatment at 300 ° C for 2 minutes shows the highest COD removal efficiency. When the amount of adsorbent is 100.0 g / L and the pH value is 2.0, the removal rate can reach 64.5 %.

Low metamorphic coal mining in our country, the author of this paper is difficult, the problem of high cost, using electric heating method of lignite in low metamorphic coal microstructure was studied, using fine microscopic CT systems respectively looked at 25 ℃, 300 ℃, 400 ℃, 500 ℃ after micro pore of lignite by using 3 d digital core technology established a three-dimensional pore fissure skeleton diagram, after high temperature, sample pore and fracture porosity are obvious increase, which, after 400 ℃, pyrolysis, sample pore development completely, sample porosity appear spurt, visible, continuous high temperature, the pyrolysis of organic matter, Accelerated pore development. The experimental data provide a reference for the mining of low metamorphic coal seam.

China is a big coal producing country,safety issues in the coal industry have been receiving much attention,but the complicated production environment has caused miners to face various emergencies at any time.Therefore, studying the emergency response of miners in the face of coal mine emergencies plays an extremely important role in the safe production of coal mines. This paper collects the real-time data of the physiological indicators of the miners in the emergency scenarios by conducting the “Miner's emergency response test in emergency scenarios”, and analyzes the relationship and regularity between the physiological indicators and the emergency response. The results showed that the miners' electromyogram, respiration rate, skin electrical power, skin temperature, pulse amplitude, pulse rate and heart rate were significantly changed during the working period of the experiment and before and after the disaster period. The emergency response index f of the miners in the established emergency scenario can quantitatively assess the emergency response capability of the miners in the emergency scenario. Miners' length of service, education and whether they have experienced coal mine safety accidents will have an impact on emergency response capabilities. This study provides a theoretical basis for the safe production of coal mining enterprises, and provides support for the selection of personnel in key positions in coal mines.

As an important transportation equipment in the industrial field, belt conveyors have been gradually developing in the direction of long distance, large volume and high speed. During the starting process, it is always accompanied by huge tension fluctuations, which affect the normal operation of the system. Therefore, it is particularly important to achieve effective control of the tensioning system for the conveyor. Considering the nonlinear problem of hydraulic tensioning system, this paper establishes the state equation of hydraulic servo system, derives the force tracking adaptive control law based on Lyapunov stability theory, and builds the model of tensioning system and control strategy in Matlab/Simulink. In view of reducing the tension fluctuation of the conveyor belt, it is proposed that the three-point, head, medium and tail, tensioning method. The conveyor belt model was built in Amesim. By simulation combining Amesim with Matlab/Simulink, the control strategy has great force tracking performance and steady-state accuracy, which effectively reduces the tension fluctuation of the conveyor belt.

Absrtact: Head sheave is a key operating component in deep well hoisting system, which mainly plays the role of bearing capacity and guidance. Because the head sheave is a running wheel, considering that it is not easy to install sensors, a real-time monitoring scheme for head sheave yaw based on line structured light is proposed. In this paper, machine vision processing technology is used to irradiate the line laser on the rotating wheel. The real-time image captured by the camera is transmitted to the image module of Labview software for image processing. Then the line structured light is extracted and the yaw is measured by the matlab program embedded in Labview, and the measured data is displayed in real time to form a curve. Line diagram is saved, so as to achieve the purpose of real-time monitoring of head sheave yaw fault.

Developed a flameproof and intrinsically safe main control box for mine pure electric trackless rubber tire vehicles. The electrical system hardware design and software design of the main control box ensure that the main control box has perfect functions, small weight, low failure rate and convenient post-maintenance; and quality inspection is carried out in various ways to ensure the function and conformity of the main control box. National safety standards are required. At present, the main control box has been successfully used in the WLR-19 mine explosion-proof lithium ion battery trackless rubber wheel vehicle, the vehicle performance is stable, and the design goal is achieved.

In order to investigate the impact of different policy options on the energy industry, based on the energy, economic, environmental, policy and social factors, based on the DPSIR theory, a simulation model of the energy industry development system from the perspective of low carbon economy is constructed. And taking Shaanxi Province as the research object, the model parameters and main equations are determined. The research results show that the extensive development of Shaanxi Province can still maintain a certain economic growth rate, but it has strong dependence on coal consumption and is obviously affected by resource constraints. The development of new energy industry has the most obvious effect on the environment. Taxation policies can be used to compensate for the cost difference between traditional and new energy sources, while economic and industrial policies have less impact.

Based on panel data of 18 cities in Henan Province from 2006 to 2017, the interaction among coal consumption, industrial structure and haze pollution was analyzed by using PVAR model from the perspective of panel moment estimation, impulse response function and variance decomposition. The results show that haze pollution is aggravated by coal consumption and industrial structure as a whole, but haze pollution not only inhibits the growth of coal consumption, but also reduces the proportion of secondary industry output value to total output value; the response of haze pollution to industrial structure is long-term positive, and the overall trend of decline; the response of coal consumption to haze pollution is long-term positive. The industrial structure is the key factor to aggravate haze pollution.