Aiming at the traditional “double-lane layout” method which is prone to induce dynamic disasters such as rockburst in deep mines, this paper summarizes and analyzes the advantages and disadvantages of the existing roadway layout methods of rockburst coal face, and establishes the concept and layout of double-connecting roadway. At the end of the thesis, the technical idea of applying the of double-connecting roadway to the coal mining face of the rockburst mine is proposed. By establishing the mechanical structure model of the roof of the double-connecting roadway before and after mining, the relationship between the stability of the double-connecting roadway and its span and the relationship between the resistance of the partition wall support and its width are obtained. The application of double-connecting roadway not only solves the problem of “double-lane layout” but also realizes the function of “double-lane layout” which can provide a reference for the design of coal mining working face in rockburst mines.

As one of the "three under" coal pressure problems, village coal pressure has long puzzled the sustainable development of the mine. How to extract the pressure coal resources by reasonable mining method is an important subject of "three under" mining work in our country at present. In this paper, by comparing and analyzing the economic benefits of various mining schemes to solve the problem of village coal pressure, the short-wall interval filling mining method is adopted to extract the village coal pressure mining area of Liudong Coal Mine. Combined with theoretical analysis, physical simulation and FLAC3D numerical simulation calculation method, the strip filling mining technology parameters and mining technology are determined. Finally, the short-wall interval filling mining technology has been successfully applied to the mining area of village coal pressure, which has a reference significance for the mining scheme of village coal pressure and the way of village relocation under similar conditions

According to the characteristics of low concentration gas in Dingji Coal Mine, such as many gas sources, large flow and long transportation distance, in order to realize the utilization of gas sources after even mixing, and to transfer the mixed gas to the thermal storage oxidation generator set safely, the gas mixing and transportation system of Dingji Coal Mine is designed from the aspects of process flow, pipe diameter selection, safety assurance, concentration mixing, etc. The field application shows that the system pipeline design and control parameters are reasonable, the gas transmission protection measures are perfect, the operation is stable and reliable, and the mixing concentration meets the requirements of thermal storage oxidation generator set.

Intelligentization is the key way to develop the surface coal mining industry, The overall characteristics of the intelligent development of surface mining in China are “Clear policy orientation, steady growth, and weak foundation”. Combining with the current intelligent development trend of open-pit mines at domestic and abroad, the current development trend are as follows: widely application of automation equipment and systems, integration of production design and mining, and integration of informationized data links, data processing and decision making. The key issues facing the current intelligent planning work are: the concept and connotation of the intelligentization of surface mines are relatively vague, the planning content and implementation approaches involved in intelligent transformation have not yet been systematic, and there are knowledge barriers in the intersection of professional disciplines, lack of reasonable "Input-output" evaluation criteria, lack of decision-making basis for the priority of planning content. The current important basic work are: construction of intelligent knowledge map for surface coal mines, construction of evaluation system for reasonable wisdom of mines, and decision-making methods for planning content priorities.

In order to improve the recovery rate of end wall pressure coal and ensure the operation safety of end wall shearer, the feasibility of end wall pressure coal mining in Pingshuo east surface coal mine were analyzed, and the design method of end wall pressure coal mining parameters was put forward, including the design method of working area parameters of end wall shearer and the calculation method of coal pillar parameters. The safety thickness of the overlying rock mass was verified, and the slope stability after the end wall coal mining wsa simulated by Midas GTS NX finite element software. The results show that the mining scheme of end wall shearer is feasible. The designed working area of end wall shearer is 80m in length, 40m in width and 300m in maximum horizontal mining depth. Under the condition of single row roadway, the width of support pillar and isolation pillar of No4 coal are 5m and 20m respectively, of No9 coal are 6m and 24m respectively. The thickness of the overlying rock mass meets the safety requirements, and the back-end side slope of the end wall coal mining is relatively stable.

Jindong coal base is an important production area of high-quality anthracite in China，which is one of the 14 coal bases planned and constructed by the state. Based on the data of "National large coal base exploitation potential research" of National Energy Administration, this paper calculates the exploitation intensity coefficient of Jindong coal base is 0.5, the capacity utilization rate is 82%, and the coal recovery rate is 52.4%. According to the calculation results, the exploitation situation of Jindong coal base is analyzed and predicted: the exploitation intensity of the Jindong coal base should be appropriately reduced; the coal recovery rate will be increased to a certain extent; the production capacity and coal production of the Jindong coal base are expected to decline, the scientific production capacity of the Jindong coal base is estimated to be 350 million t/a and the output is about 280 million t/a. It is of great significance to the scientific mining and sustainable exploitation of Jindong coal base.

ABSTRACT:It is necessary to design and apply the shaft lining structure with high bearing capacity in deep freezing shaft. The cast-in-place high strength concrete is a feasible method to improve the shaft lining bearing capacity.The design and application of concrete lining larger than C80 are lack of corresponding specifications and code.and ;of regulations on the design values of concrete axial compressive strength, tensile strength, elastic modulus and other physical and mechanical parameters, it is of practical significance to study these parameters and their reasonable values in the design of shaft lining structure. Through the comprehensive research on the concrete design code at home and abroad, the research achievements of domestic scholars and the verification test carried out for this study, some suggestions on the design values and characteristic values of C80 ~ C100 axial compressive strength, axial tensile strength, elastic modulus and Poisson's ratio are put forward, it provides a basis for formulating technical specification and forming technical system of applying C80 ~ C100 concrete in shaft lining design by freezing method.

Based on the roadway layout and surrounding rock control of 2302 upper drift disturbed driving along goaf in Yili Yongning Coal Chemical Co., Ltd, the background mining and numerical simulation were used to analyze the advanced mining stress and lateral support of the 2301 working face. The range of stress influence is determined. The advance 80m and the lag 100m are the influence range of the disturbing disturbance. On this basis, the bearing evolution law of the surrounding rock of the different coal pillar width 2302 is further analyzed, and the reasonable narrow coal pillar of the 2302 upper channel is determined. The width is 6.0m. Finally, the reinforcement support technology of the anchor cable support and the single hydraulic props with the π beam is proposed in the range of the disturbance, and the industrial test is carried out on the 2302 groove. The results of the mine pressure observation show that in the extra-thick coal seam, the 6.0m coal pillar width and the surrounding rock control technology of the excavation along the goaf are disturbed. The research results have important application value for alleviating the problem of tight mining succession.

In order to solve the problem of serious deformation of roadway under the influence of stress superposition of overlying coal pillars, the deformation law of roadway is studied through field measurement, and the fracture characteristics of surrounding rock are analyzed by means of borehole peeping and hydrostatic water injection test. A comprehensive treatment scheme of grouting first, then fastening, and finally strengthening with pre stress anchor cable is formulated, and industrial test is carried out. The results show that: The initial deformation stage is 0-18 days after restoration, which is the key stage of roadway treatment. The Shallow coal wall has a large number of fissures with good connectivity, and the deep coal wall have a small number of fissures with poor connectivity, It is necessary to use prestressed anchor cable for full-length anchoring to reinforcement. After the comprehensive treatment scheme is adopted, the roadway deformation is effectively controlled, the maximum floor heave is 51mm, and the maximum approach of the two sides of the roadway is 42mm ，the settlement of roof is 4mm, and the deformation of roadway is effectively controlled.

In order to solve the problem that the hard roof of coal seam in Pingmei No.2 Coal Mine makes it difficult to control the surrounding rock of the mining roadway, the directional fracture blasting technology of D-shaped energy-accumulating tube is applied in the gob-side retaining roadway. Through theoretical analysis of the technical principle of directional fracture blasting, field test and borehole peep, the positive effect of D-shaped energy-accumulating tube directional fracture blasting technology on controlling the deformation of surrounding rock of gob-side retaining roadway is The reasonable blasting and charging parameters in the gob-side retaining roadway of Pingmei No. 2 Coal Mine were determined, and the field industrial test was carried out. The test results show that the directional blasting can be achieved by using D-shaped shaped shaped energy-accumulating tube directional fracture blasting technology. The effect of roof pre-splitting is good, the basic roof in gob-side retaining roadway can be effectively cut off, the bearing capacity of roadway itself can be improved, the stability of surrounding rock can be guaranteed during the period of dynamic pressure influence, and the reliability and safety degree of support for gob-side retaining roadway can be significantly improved, which is beneficial to Full production has certain engineering reference value for the selection of parameters of pre-splitting blasting under similar conditions.

Formation resistivity contains abundant formation information, and the accurate description of rock resistivity is particularly important for the resistivity detection interpretation. Based on the systematic analysis of the resistivity characteristics of geotechnical materials, the resistivity formula of unsaturated rock is deduced by combining the Maxwell conductivity theory formula, which is verified to be consistent with Archie's formula. High density electrical method and transient electromagnetic method are used to carry out comprehensive geophysical exploration in the field area, and the goaf and overburden resistivity is interpreted based on the theory of rock resistivity and verified by drilling. The results show that the resistivity of compressed rock positively correlated with the volume strain; there is an electrical abnormal transition zone in the adjacent area of goaf; The height of transition zone is consistent with that of caving and fractured zone. And the resistivity comprehensive exploration can basically reveal the distribution pattern of goaf .

In order to solve the problem of large-scale gas pre-drilling and drilling engineering, low extraction concentration and long extraction time, the directional long-hole gas drainage technology is applied to the strip pre-extraction of Yushutian Coal Mine. The research shows that the length of single hole in the coal seam of Yushutian Coal Mine can reach 723m, the proportion of coal seam hole is as high as 96%~100%; the concentration of daily gas drainage is 73.8%, and the maximum daily extraction volume is 23017 m3/d; Orientation Long Hole Gas Drainage Technology The coal seam has a high proportion of holes and a fast extraction speed, which can achieve the regional elimination measures. This study provides a reference for gas control and gas utilization of mines and adjacent mines.

In order to eliminate the outburst risk of high gas and low permeability coal seam, the stress field monitoring technology is used to monitor and test the effect of coal seam hydraulic cave building, and the stress evolution law of coal seam before and after hydraulic cave building is analyzed. The research results show that the stress changes of coal seam around the borehole are different in space. The closer the borehole is to the borehole, the more obvious the stress changes of coal seam are; after the completion of the construction of the borehole, the earlier the stress changes of the position near the borehole, the more single the change trend, the greater the pressure relief amplitude; the farther the borehole is to the borehole, the later the stress changes, and the more complex the change trend compared with the results of gas pressure measurement, the monitoring results of stress field can fully reflect the implementation effect and influence range of hydraulic hole making.

The joint monitoring technique of well-ground microseism for monitoring the development height of water conduction fracture zone in working surface is put forward in this paper. Based on the joint monitoring results of microearthquakes up and down wells, the quantitative and spatial distribution characteristics of microseismic events in vertical direction are analyzed. The relationship between the distribution of microseismic events caused by mining in working face and the development height of water diversion fracture zone is studied. Based on the theoretical calculation results of empirical formula, the development height of water diversion fracture zone is compared and studied. The results show that: The joint monitoring technology of microearthquakes up and down the well has high positioning accuracy. The microseismic events are mainly concentrated at both ends of the working face in the plane position, the stress concentration on the side of return air roadway in working face is obviously higher than that on the side of transportation roadway. The microseismic events in the vertical direction are mainly concentrated in the range of 80m above the coal seam, the number of microseismic events decreased sharply after 80m above the roof. The theoretical calculation results are consistent with the microseismic monitoring results. The research results provide an effective method for monitoring the development height of water diversion fracture zone.

The coal seam in the Shoushan First Mine lies in the second stage thermal hazard zone. The geothermal gradient above the coal seam floor is 2.63-4.18℃/100m, and the average geothermal gradient is 3.42℃/100m.In order to ensure the physical and mental health of the workers and the production safety of the mine, Pingbao company adopts the ground centralized cooling technology to deal with the thermal hazard of the Shoushan First Mine. In this paper, the cooling effect of the ground centralized cooling system is evaluated by analyzing the cooling effect of each working face in the Shoushan First Mine. The results show that the temperature of the working face decreases by 5-11℃and the humidity decreases by 20-30%. The temperature of the working face basically drops below 25 ℃, and the humidity drops below 75%.The engineering practice of Pingbao company in Shoushan First Mine provides new ideas and methods for the cooling of high temperature mine.

Based on the engineering background of cutting roof along the hollow roadway under the condition of hard roof in tangshangou coal mine, in order to reasonably determine the cutting parameters of the roadway, this paper analyzes the law of overburden movement along the hollow roadway and the structural characteristics of roof fracture by using "masonry beam" theory. The results show that: under the condition of hard roof, the roof of cut-top retaining roadway will be hinged with each other to form the balance structure of masonry beam. The underground test shows that the roof cutting parameters obtained by the calculation formula in this paper can make the side roof of the goaf in the roadway better be "cut off ", and the pressure of the roof and the amount of the roof moving in the roadway are within the controllable range to meet the needs of safety production.

In order to solve the problems that the large deformation of deep surrounding-rock and the conventional support materials are easy to break and fail, the structure, working principle and mechanical characteristics of the constant resistance and large deformation anchor rope are studied. The indoor test results show that the constant resistance anchor rope can maintain a constant working resistance of 350kN during static tensile and power impact, which shows the good resistance impact of the constant resistance anchor rope and the constant resistance suction energy characteristics. The constant resistance anchor rope is applied to the deep gob-side entry retaining by cutting roof, most of the constant resistance anchor ropes produce a certain indentation，which shows the constant resistance anchor ropes absorb the deformation energy of the surrounding rock well. The surrounding-rock of gob-side entry retaining achieve stability about 300m behind the work surface, all indicators can meet the requirements of on-site use. The surrounding-rock deformation of the deep gob-side entry retaining by cutting roof is controlled well by the constant resistance and large deformation anchor rope，thus the reliability of constant resistance anchor rope support is verified.

In Pingdingshan mining area, the large coal pillars left over from the mining process of the coal seam group of the upper and lower strata have an important influence on the tunneling of the coal seam group of the lower strata and the roof pressure and coal seam occurrence state in the mining process. In order to study the influence of the remaining pillars on the underlying coal seam, the roof stress was studied by using bolt stress meter. According to the in-situ monitoring of the bolt stress in the roadway of the underlying coal seam, the influence area of the residual coal pillar on the stress of the underlying coal seam can be divided into three areas: the weak influence area (I area), the intense influence area (II area) and the stable influence area (III area). Through FLAC3D software simulation, the change trend of stress in the affected area is analyzed, and the influence rule of the remaining coal pillar on the underlying coal seam is verified. The research results can provide theoretical basis and on-site guidance for roof management, gas control and outburst prevention measures when driving and mining through coal pillars in the underlying coal seam.

Influenced by the accuracy of geophysical prospecting, some small faults in coal mine can not be effectively detected, which poses a serious threat to the safety of underground production. Accurate prediction of hidden faults is an urgent need for safe mining in working face. Based on the analysis of a large number of microseismic events, this paper shows that microseismic monitoring can be used as an auxiliary monitoring method for detecting hidden faults in working face. The main methods are: DDT, DWT and energy density methods are used to transform the time domain, frequency domain and energy domain curves of microseismic events, and the "time-frequency-energy" characteristic analysis method of microseismic events is proposed. Based on this method, the difference of "time-frequency-energy" characteristics between the curves measured before and after faults for the same microseismic event is analyzed. Research shows that: in the time domain, there are many peaks of microseismic events before faults, short duration of vibration, undeveloped coda, and the opposite is true after faults. In the frequency domain, the frequency band of microseismic events before faults is complete, and the low, medium and high frequency bands are distributed. The frequency domain curve shows multi-peak characteristics, while the microseismic events after faults are concentrated in the frequency band of 0-20Hz, showing a sharp single peak characteristic. Faults play a similar role of "low-pass filtering" for microseismic events. In the energy domain, the energy of microseismic events before faults has the characteristics of short-term, full-frequency and continuous propagation, while after faults, the energy of microseismic events is opposite. Based on this, the abrupt change reason of microseismic event waveform curve in 3307 working face of a mine is analyzed. It is inferred that there are hidden faults interfering with the propagation of vibration wave in front of the working face. The F2 hidden faults exposed subsequently in the working face verify this inference.

In order to study the stability of artificial dam body in coal mine groundwater reservoir, the stress environment of artificial dam body construction is analyzed. It is believed that the coal mine groundwater reservoir will form a confining pressure environment around the dam body after water storage. The artificial dam model is established by using FLAC 3D numerical simulation software. The gradient water pressure is applied to the front of the model to simulate the water pressure environment of the reservoir. The simulation results show that: After different confining pressure conditions are applied to the dam body, the difference between the artificial dam body stability and the non-confining pressure condition is obvious. The application of lower strength uniform confining pressure and non-uniform confining pressure will improve the stability of the artificial dam body. Horizontal uniform confining pressure or obvious uneven confining pressure will promote the destruction of the artificial dam. Using the theoretical formula and numerical simulation to analyze the maximum displacement of the artificial dam surface, it is found that the maximum displacement of the dam surface and the reservoir storage height show a good linear relationship. When the confining pressure is low, the dam surface changes. The trend is very small, but the stability of the dam is quite different, which indicates that the stability of the dam can not be accurately reversed by the surface displacement characteristics of the dam.

In order to study the temperature field distribution law of inclined freezing shaft in water-rich sand, the paper takes a mine in Northern Shaanxi as the research background, and it’s studied by theoretical analysis, field measurement and numerical simulation. Given the mathematical model for the temperature field, and based on the superposition principle of the field given the mathematical model for the distribution of temperature field under multiple freezing pipes. The field test results of inclined freezing shaft show that: the closer to the freezing pipe, the faster of the cooling and heating speed of the freezing shaft, and the burial depth has a certain impact on the development of temperature field, but the impact is weak. It can be seen from the comparison between the numerical simulations results field measurement results that during the freezing process the variation trend of temperature is basically the same and the temperature difference of each measuring point is less than 2℃, which shows that the numerical simulation analysis of the temperature field in this paper is reliable and effective, and It can better reflect the general law of the freezing shaft with the freezing time.

On field survey and points sort in Li Jiahao Mines for coal gangue，coal gangue rock of different abandoned times in-situ shear test and indoor large shear test，analyzes the corresponding experiment of coal rock mass shear stress，shear displacement curve，the peak shear stress was calculated under different stress level of shear strength，combined with the rock strength criterion on Hoek Brown - cohesion and internal friction Angle of the test results were discussed. The results show that the longer the disposal time of gangue，the better the cementation of gangue block，and the later the peak strength of gangue rock mass，the greater the shear strength. In the pre-peak strength stage，with the increase of shear stress，the shear deformation of gangue is mainly elastic deformation. The cohesion and internal friction Angle of gangue in situ shear test are both larger than that of large shear test，the cohesion value estimated by Hoek-Brown rock mass strength criterion is larger than that of test，while the internal friction Angle estimation is close to that of test. It provides a reference for the future study of the shear characteristics of gangue rock mass and the stability analysis of gangue rock slope.

As one of the key factors of safe, efficient, energy-saving and environment-friendly operation of the main fan, air volume regulation plays an important role in the safe and economic operation of the coal mine. firstly, the paper analyzes and compares the energy-saving schemes using different methods of regulating air volume control, and puts forward the energy-saving scheme using the variable frequency speed-regulating control technology.secondly, combined with the potential unsafe factors existing in the application of frequency converter in coal mine, a control system of frequency conversion-by-pass power frequency fan based on S7-300 PLC is designed and verified, the verification results show that the fan control system is reliable, ?non-misoperation, non-rejection, and high security. ?Finally, through the actual application case, the paper comprehensively evaluates the application effect of the fan control system, the evaluation result shows that the application effect of the control system is good, centralized control is realized in the dispatch room, and the on-line real-time monitoring of the fan is realized, the goal of reducing the number of people and improving the efficiency was achieved.

In order to further study the pyrolysis kinetics characteristics of low metamorphic coal in situ fluid mining process, differential scanning calorimetry and flash method was used to investigate the characteristics of specific heat capacity and thermal diffusion coefficient of lignite evolving with temperature. The results show that both the specific heat capacity and thermal diffusion coefficient of lignite increase first and then decrease with the temperature rising, and the obvious threshold temperature is obtained. Based on the analysis of lignite thermal weight loss characteristics, it can be seen that the relationship between the change of lignite weight loss and the specific heat capacity evolution is obvious. The thermal diffusion coefficient of lignite is affected by the constituent phase in the coal and is proved to be anisotropic characteristics. It is concluded that the variation of lignite composition and content is the internal cause of the complex variation of thermodynamic parameters under the temperature effect. And the mechanism of water phase transition and thermal decomposition determines the evolution of thermodynamic parameters with temperature rising.

To overcome the shortcomings of traditional linear regression model in coal calorific value prediction, such as low prediction accuracy and narrow applicability, the linear correlation between the index of proximate analysis and elemental analysis and the calorific value of coal was comprehensively investigated. the characteristic variables of influencing the calorific value were selected by Mean Impact Value (MIV) method. Combining Particle Swarm Optimization(PSO) method to optimize the traditional BP neural network, a non-linear prediction method of coal calorific value is proposed based on MIV-PSO-BP neural network. The results show that only ash and carbon content show a certain linear correlation with calorific value in the indexes of proximate analysis and elemental analysis of coal, the other indexes show a poor linear correlation with calorific value. The indexes of proximate analysis of coal have great influence on calorific value, while only carbon content and hydrogen content have significant influence on calorific value from elemental analysis, and the effect of other indicators on calorific value is negligible. Compared with other calorific prediction models proposed by other researchers, the average relative error and root mean square error of MIV-PSO-BP neural network model are lower, and the overall prediction effect is better. The correlation coefficient can reach 98.60%.

In order to solve the problems of high tar content of gas at the outlet of Lurgi furnace and low gasification efficiency, which hinder the clean utilization of pyrolysis products, and cause high cost of water treatment in the post-system. To reduce the yield of tar, increase gas output and coal conversion rate, Shengli lignite was used as the research object, the binary composite catalytic pyrolysis experiment of Shengli lignite was carried out in a fixed bed atmospheric pyrolysis reactor and at 600 ℃, the effects of the type and ration of binary composite catalysts prepared by four single component catalysts, K2CO3、Ca (NO3)2,CaO and Fe (NO3)3, on the pyrolysis product yield and pyrolysis conversion were investigated to reveal the catalytic pyrolysis characteristics of Shengli lignite at medium temperature. The results showed that the gas yield increased most significantly when adding 5% K/Ca catalyst with 1:1 ratio, from 8.46% without catalyst to 14.88% , and the yield of outstanding realization as H2 and CO improved very well. The tar yield decreased 62.4% compared with the pyrolysis of raw coal, in which asphaltene decreased 82.09% and aromatic hydrocarbon increased 21.69%, this shows that the addition of catalyst can reduce the yield of tar, improve the quality of gas and realize the directional conversion of pyrolysis products.

In view of the current and voltage faults that may exist in the operation of cable rewind, an intelligent cable rewind protection system is designed, which takes STM32F103RCT6 single-chip microcomputer control unit as the core and integrates the functions of collection, judgment, protection and inspection, so as to realize the reliable protection of cable rewind.Due to the traditional overcurrent protection method in cable roll cart appears not to conduct a comprehensive effective protection current failure, so the introduction of the basic theory of symmetrical component method as a protection to put car running current fault detection cable volume, by measuring the degree of over current runtime, zero sequence current, negative sequence component and low voltage and overvoltage, cable roll cart for short circuit fault protection, open phase protection, unbalanced three-phase fault protection, single-phase earth fault protection, two phase ground fault protection, under voltage fault protection and overvoltage protection.To collect to the voltage, current signal into a single chip can handle the single polarity of small signal, design the signal conditioning circuit, and design the protection system of software, including data collection and processing, data analysis and calculation, fault detection, protection action to perform, as well as the human-computer interaction part, realized with cable roll cart running state judgment and fault alarm function.The test results show that the protection device meets the protection requirements.

Abstract: In order to solve the technical bottlenecks of mining pure electric explosion-proof vehicles that cannot effectively solve the limited volume of explosion-proof power batteries with limited volume, high vehicle quality, and low efficiency, which have seriously restricted the mileage of the vehicle, and have troubled the development and promotion of mining electric vehicles, The key technical methods to effectively improve the endurance of mining electric vehicles, such as the multi-speed transmission system and the integration of the transmission system, are introduced. Research shows that under the current situation that the performance of explosion-proof power batteries cannot be greatly improved in the short term, the above method can effectively reduce the overall vehicle quality by 8%, and increase the average mileage by 20%. Electric vehicles provide a theoretical basis and promote the development of green and efficient auxiliary transportation in coal mines.

In view of the need of intelligent and automatic coal production, this paper selects S7-300 PLC and iFIX 5.5 configuration software to form an intelligent control system, and successfully applied to the control system of belt conveyor in Zhaogu No. 2 Coal Mine.Considering the loss of power caused by the continuous maintenance of the conveyor while the belt conveyor is transporting coal, the theory of fuzzy control is introduced, and the PLC is used as a fuzzy controller to match the belt speed with the coal flow.The results show that the system can not only realize the needs of intelligent monitoring of Zhaogu No. 2 Coal Mine, but also effectively save energy and improve production efficiency.

Responsible innovation（RI） provides a new idea for industrial innovation and development under the background of increasingly prominent environmental problems. Based on the theory of responsible innovation, taking the coal industry as an example, the method of text mining was used to trace back and deconstruct the coal industry policy issued from 2012 to 2020, the overall characteristics, allocation key points, policy departments and measures circulation of the coal industry policy were analyzed, the existing problems was analyzed, and the development path and evolution law of the coal industry were clarified. The results show that: (1) the orientation of policy value and system dimension of coal industry is prior to that of technology dimension. The concept of responsible innovation has been paid more and more attention by government departments, but the allocation of attention is not balanced; (2) the policy focuses more on innovation quality, management and safety, but lacks in culture, integrity, science and technology ethics, public satisfaction and justice. The research is helpful to understand the overall situation and focus of government attention allocation in industrial innovation policy, and provide reference and basis for local government to further revise, supplement and perfect relevant policy decisions.

Taking 30 provinces and cities in China as research objects, research on the spatial and temporal differences and driving factors of coal utilization efficiency in the electric heating industry. Firstly, the coal utilization efficiency of the electric power industry in 30 provinces of China was measured and analyzed from 2001 to 2015. Then, Geoda software was used to analyze the time and space difference of coal utilization efficiency in the electric heating industry. Finally, the spatial error model was used to test the impact of coal utilization efficiency in the electric heating industry. The research results show that the coal utilization efficiency of China's electric heating industry is not high during the period from 11200 to 2015, and it shows a small downward trend; the coal utilization efficiency of 30 provinces and cities is not effective, and there are obvious differences, showing the east > middle > The distribution pattern of the west. 2 The coal utilization efficiency of China's inter-provincial electric heating industry presents a positive spatial auto-correlation, and there is a clear agglomeration state, and the neighbor effect is significant. 3 The main driving factors of coal utilization efficiency in China's inter-provincial electric heating industry are industrial development level, industrial agglomeration, technological progress, transportation and government regulation.