The study of coal mine equipment’s comprehensive evaluation index system and evaluation method

1 Limitations of current evaluation index system of coal mine equipment While the operating mechanism of coal enter-prise changes, the equipment management’s state isimproved constantly. But the enterprises’ equipmentmanagement developed unevenly, presenting a trendof polarization. Some listing coal enterprises that havegood mechanism and bent on making progress reformand innovate constantly. They have formed the man-agement mode of equipment with their own charac-teristics. But the effect …     

Integral evaluation of operating quality and the deciding of management strategy in productive coal mines

According to overall mean square root of weighted deviation, presented an evaluation model of “geology-technique-social conditions“ with a significant index system for the estimation of operating quality in productive coal mines. In the given example, the evaluation result is used to decide management strategy of coal mine, which plays a guiding role in the production.     

Application of coal mine dynamic safety management and occupational health and safety management system

A method system was put forward based on the occupational health and safety management system to develop the dynamic safety management of coal mine. It aimed at the problems in the mining safety management and was put in practice in Lingxin coal mine of Ningxia Coal Industry Group Co., Ltd.. And good effect was obtained in safety work. It developed the mining dynamic safety management based on the building of occupational health and safety management system of mining enterprise and its main contents are as follows： timely identification and dynamic control of accident risk, persistent improvement of safety management performance according to the ＂PDCA＂ circle.     

Application of fuzzy integrated evaluation in the safety of coal industry of China

Based on fuzzy integrated evaluation theory, the safety of coal industry was analyzed, the factors affecting the safety of coal industry was considered, and its fuzzy integrated estimating theory and results were given. Finally this paper proposed a new method of industry safety estimation. According to this method, we can integrate the factors affecting coal industry and deal with the parameters and targets of evaluating factors by quantitative analysis, thus give a scientific and reasonable safety degree analyzing evaluation.     

The environment of coal mining areas and the economic evaluation of the land reclamation

The environment impact of the coal resources mining was analyzed. The method of economic evaluation for the coal mining was established to analyze land destruction. The opportunity cost method was used to quantitatively analyze and estimate the economic loss of the land destruction by coal mining. At the same time, the dump land reclamation of the Yuanbaoshan. Open Pit was taken as an example to evaluate environmental and economical benefit with the method of economic evaluation for the coal mining areas land reclamation.     

THE “STRUCTURE-STRATIGRAPHY ANALYSIS”METHOD APPLIED IN THE PREDICTION OF SMALLER-SCALED STRUCTURE IN UNDERGROUND MINING

“Structure-stratigraphy analysis“ is a new method used in the study and prediction of and small-scaled structures in coal mines. The object of this method is coalbed structure that includes the folds and fracture occurred in the vicinity of coal-seams. It emphases the analysis on the relationship between structural deformation and stratal lithologic combination.Based on the statistics of a series of related parameters in stratigraphy and structure,comprehensive analysis and drawing, this method may provide a good means for the quantitative evaluation and prediction of small scale structure in coal mines.     

Evaluation indexes of green mines issued

正The Ministry of Natural Resources of China issued"Evaluation Index of Green Mines"and"Requirements for the Third-party Evaluation of Green Mines Selection"on June 2020,which unified the evaluation index standards and standardized the third-party evaluation work.It aimed to further regulate the mine development and evaluation system.     

New application notion of pipeline transport—— integrated in industry solid waste innocuous and efficient disposition

In order to solve transport problems of industry solid, firstly, a new application notion of pipeline transport was presented, that is to say, combining pretreatment and transport with disposal techniques of industry solid waste. Secondly, the integrated disposal and transport system for industry solid waste was introduced, in particular, the operating principles, equipment set-up, key technology and technical parameters. Next, this paper illustrated the application of this integrated system. Such as it can transport coal sludge with sufficiently high solids content （ about 72%-77%） and high apparent viscosity （about 1 000-3 000 Pa.s） directly by pipeline having no use for water and addition agent. Generally, the transport distance is about 1 000 m. This system has been successfully used in innocuous disposition and efficient utilization of other industrial byproducts or solid wastes, such as city sludge and paper making waste. The integrated system causes no pollution to the environment for its complete seal and realizes protecting the environment, conserving the energy, promoting the development of cycling economic. Finally, the paper discussed the research works that were needed for studying such pipeline transport system and narrates the relevant condition and application status.     

The instability mechanics of surrounding rock－coal mass system in longwall face and the prevention of pressure bumps

According to the movement and change rules of mechanical structure of surround-ing rock-coal mass system during coal excavation, the mechanism of sudden instability and damage was found out. The criterions that distinguishing the occurring of the pressure bump were put forward. This criteria have been applied successfully in the comprehensive prevent of pressure bumps in Tangshan colliery.     

Analysis on safety production in coal mines Henan Province

Based on the rigorous situation of safety production in coal mines, the paper analyzed the statistical data of recent accidents indexes in Henan＇s coal mines. Using investigation and comparison analysis methods, a specified analysis on mining conditions, technical facility level, safety input and vocational quality of workers in Henan＇s coal mines was conducted. The result indicates that there have been existing such main safety production problems as weak safety management, low-level facilities, inadequate safety input and poor vocational quality and so on. Finally it proposes such reference solutions as to establish and perfect coal mining supervision and management system, to increase safety investment into techniques and facilities and to strengthen workers＇ safety education and introduction of more high-level professional talents.     

Study on the efficacy of the safety incentive mechanisms

Safety incentive mechanism and corresponding motivation avenues are helpful and important for the scientific safety management in coal mine. With the help of modern systematic analysis method, the efficacy of safety incentive mechanisms is discussed in detail. The research shows that more effective avenue to reduce accident is to differently use motivation measures in practice.     

Mating model on production capacity for the system of cutting coal and drawing top-coal in FMMSC

Being a safe and highly-efficient mining method, fully mechanized mining with sublevel caving （FMMSC） was extensively employed in Chinese coal mines with thick seam. In order to make drawing top-coal furthest to parallel work with shearer cutting coal, decrease failure ratio of rear scraper conveyor and increase safe production capacity of equipments, based on production technology, set up the mating model of safe production capacity of equipments for the system of drawing top-coal and shearer cutting coal in coal face with sublevel caving. It is mean capability of drawing top-coal adapted to the capability of shearer cutting coal in a working circle in the coal face that was deduced. The type selection of equipment of rear scraper conveyor can be tackled with this mating model. The model was applied in FMMSC in Yangcun Coal Mine, Yima Coal Group of China. With the mating light-equipments, the coal output in coal face attained 1.05 Mt in 2004. It gained better technical-economic benefit.     

Development of regional prediction information system of coal and gas outburst

Coal and gas outburst information system is based on Geographic Information System（GIS）, with which the relation among mine geological structure, coal features, stress field and coal and gas outburst were researched, and also the relation between gas distributed condition and dangerous degrees. Various prediction method, index and technique were applied to realize the data visualization; the accuracy of region prediction was increased. The system has successfully applied in Huainan minging area and Pingdingshan minging area.     

The design and simulation of TCR（thyristor control reactor） reactive power compensation system based on Arene

Inevitably, the question of reactive power compensation was aroused by applied of power electronics. Based on the study of the instantaneous reactive power theory, the designs of TCR(thyristor control reactor) thyristor control reactor reactive power compensation system and TCR single closed loop strategy was proposed. In addition, as digital simulation software, Arene was applied to simulate the Jining coal mine No.2 system. The simulation results validate that the design is effective to improve power factor and stabilization of the system.     

THE INERT HOLDING RATIO OF COAL ANDTHE STRENGTH OF COKE

The variation regularity of coke strength was investigated in terms of the genetic fac-tors and petrographic parameters of coal in collaboration with the technical properties of coal. Aconcept of inert holding ratio of coal was proposed. There is an optimal inert holding ratio for dif-ferent ranks of coals for making coke with highest combined strength. The additive property of in-ert holding ratio under normal conditions was demonstrated with actual examples of coal blending.Thus it is possible to predict the combined strength of coke through reflectance, content of inertcomponents and caking index (Ro, max-I-G) diagram system.     

Study on the countermeasures against methane outburst of mining multiple upper protective layers in coal seams cluster

In order to prevent coal and methane outbursts, mining protective layers is an effective means, yet no precedents of mining multiple protective layers is discoveried inseams which in cludes several seams are prone to outburst like Xinzhuangzi Mine. This paper perfected the related theories through analyzing mining multiple upper protectivelayers. By means of examining several parameters, it synthetically analyzed and ascertains the protected effectiveness and scope and reasonable parameters, finally obtained the specific indexes and effectiveness of mining multiple protective layers in coal seams cluster.     

Theoretical study on safety assessment indexes system of coal mines

The safety status of the coal mines is closely correlated with the operating status and its changes of the whole working system in the coal mines, and the safety system is the sub-system of the whole production system. In this paper, based on the analysis of the complicacy of the safety sub-system and its affecting factors, the theory basis of the indexes system of the safety assessment was studied, including the establishing principles of the indexes system , the structure of the indexes system, the determining methods of the assessment indexes. The complete indexes system was established for the safety assessment of the coal mines in the paper.     

The application of option pricing theory to the evaluation of mining investment

A rational evaluation on an investment project forms the basis of a right investment decision-making. The discounted cash flow ( DCF for short) method is usually used as a traditional evaluation method for a project investment. However, as the mining investment is influenced by many uncertainties, DCF method cannot take into account these uncertainties and often underestimates the value of an investment project. Based on the option pricing theory of the modem financial assets, the characteristics of a real project investment are discussed, and the management option of mine managers and its pricing method are described.     

Research on ＂bridge＂ mode of mine security production management

Realized new break-through on the basis of existing security management theory, tentatively and creatively carried out ＂realizing management theory of mine security production＂ and proposed ＂bridge＂ mode of realizing green management theory. Green management theory has an integrated system structure. The green management system of mine security production includes three parts, the foundation of green system, the supervision system of green system operation and the safeguard system of green system. The key of ＂bridge＂ mode is to analyze the existing insecurity factors in the process of security production and establish corresponding regulations.     

Research on safety management shell in coal mine

Based on the shell (jieke) theory investigation of accident prevention in coal mine, submited a new definition of safety management shell, and analyzed causes on the lack of accident prevention, then pointed that the strength of research and practice of safety management is necessary to format enduring safety in coal mine.