Coal Mine Emergency Rescue Research Articles

Sulfonated graphene oxide modified polysulfone-polyamide forward osmosis membrane and its application in fluorine-containing wastewater treatment

In view of the low water flux and fluoride ion (F−) retention rate of forward osmosis emergency water bags in coal mine emergency rescue, sulfonated graphene oxide (SGO) is selected to modify the polysulfone-polyamide forward osmosis (FO) membrane to obtain high water flux and F−retention rate in this work. The results show that the crosslinking of m-phenylenediamine (MPD) improves the sulfonated graphene oxide (SGO) dispersion of the polyamide layer in the interfacial polymerization (IP) reaction, and the polyamide active layer with more hydrophilic and more water flux is obtained, and the increase in water flux is up to 6 times. Furthermore, the negatively charged SGO reduces the surface potential of the polyamide membrane, which significantly improves the F−retention effect of the high water flux FO membrane to 83.2 %. At the same time, the existence of Donnan's law leads to differences in the retention performance of different anions. Therefore, SGO-modified polysulfone-polyamide FO membrane presents excellent permeability performance, which provides a new combination of materials and technologies for fluorine-containing wastewater environmental emergency rescue and high-fluorine wastewater treatment.

Research and Application of Knowledge Decision Method for Optimal and Fast Drilling in Emergency Rescue Wells

The efficiency of coal mine emergency rescue work is limited by the professionalism of decision-making, the efficiency of rescue team formation and the rate of resource mobilization. Knowledge sharing and inheritance have important reference meanings for improving the efficiency and success of rescue work. In order to improve the efficiency of rescue work, this article builds A knowledge base that meets the needs and research on key content[1]. This article first analyzes the knowledge engineering, knowledge representation and knowledge storage of emergency rescue well drilling; secondly, based on the analysis of the emergency rescue well work flow, it classifies the knowledge of fast drilling, and studies the knowledge expression based on ontology[2]. Construct the ontology model of knowledge and establish the knowledge base; then, in view of the shortcomings in the current knowledge retrieval, apply the full-text search to the retrieval of the fast drill-in knowledge, construct the retrieval model and design the index structure of the knowledge base, on this basis The ranking of knowledge retrieval is optimized. Finally, combine the retrieved knowledge and follow the emergency rescue process to form a set of decision-making plans. Through the application of the case study in this article, it is shown that the standardized management of the knowledge of excellent and fast drilling in emergency rescue wells is realized, the speed and quality of the acquisition of knowledge of excellent and fast drilling are improved, and the efficiency and professionalism of decision-making are improved.

Evaluation model of coal mine emergency rescue resource allocation based on weight optimization TOPSIS method

In order to solve the problems of unreasonable allocation and low efficiency of emergency rescue resources in coal mine accidents, it is necessary to establish a coal mine emergency rescue resource allocation model by using comprehensive weight-approximation ideal solution (TOPSIS method).This paper takes rock burst in a coal mine as an example by extending this designed emergency rescue plan. Firstly, calculated the weight of the evaluation index affecting the emergency rescue is selected by AHP method and entropy weight method respectively. Then weight optimization is inspired by comprehensive weight method. Finally, the optimal scheme is selected by TOPSIS method, and the model is verified by AHP method approaching ideal solution and entropy weight method approaching ideal solution. The results shows that: (1) There are two influencing factors have great effect on the evaluation of coal mine emergency rescue model, which are rescue time and advance of rescue channel; (2) The optimal scheme is program 5 through comprehensive weight approaching ideal solution, which is consistent with the actual situation of the project, indicating that the model has high reliability.

Numerical simulation analysis of coal rock crushed by disc cutter based on ABAQUS

In view of the lack of research on the mechanism of disc cutter cutting coal rock during the tunnelling process of coal mine rescue tunnel equipment, the ABAQUS software was used to establish the finite element model of single disc cutter crushing coal rock, and the influence of penetration and cutting speed on the rock breaking force during the process of disc cutter crushing coal rock was analyzed. The results show that the average cutting force increases linearly with the penetration and cutting speed. The maximum vertical force of the disc cutter at a penetration of 5mm is 2.6 times that at a penetration of 2mm. The impact of the disc cutter cutting force at a penetration of 3mm is obvious. The average rolling force at a cutting speed of 0.8 rad/s is twice that of a cutting speed of 0.2 rad/s. The impact of the disc cutter cutting force at a cutting speed of 0.5rad/s is obvious. Comprehensively considering the influence of penetration and cutting speed on the average value and fluctuation range of disc cutter cutting force, choosing a moderately large penetration and a large cutting speed parameter combination will help to achieve rapid and safe coal mine emergency rescue tunnelling. The method in this paper provides a basis for the optimization of the cutterhead tunnelling parameters during coal rock cutting.

Structure and Simulation of Roadway Disaster Simulation Control System for High Temperature Smoke Drill

In view of the outstanding problems of the training environment in the high-temperature smoke environment, such as failing to meet the actual combat requirements, poor effect and low efficiency, an integrated simulation exercise system of high-temperature smoke for coal mine emergency rescue is established, which mainly includes the high-temperature smoke control system and the smoke control system. The high temperature drill control system adopts PLC control temperature algorithm and introduces PID fuzzy control rule. The simulation results show that high accuracy of temperature and flue gas concentration can be achieved through PLC fuzzy PID control. The system can simulate the hot smoke environment and achieve the purpose of the actual exercise.

An emergency rescue communication system and environmental monitoring subsystem for underground coal mine based on wireless mesh network

According to the characteristics of the underground coal mine roadway structure and disaster environment, this article proposes an underground emergency rescue communication system based on wireless mesh network and its corresponding environmental monitoring subsystem. We design the structures of the emergency rescue communication system and the wireless mesh nodes. The nodes are designed with intrinsic safety features. The work also develops wireless multi-parameter environmental monitoring terminals, and sets up the software platform for the environmental monitoring subsystem. The developed underground coal mine emergency rescue communication system based on wireless mesh network and environmental monitoring subsystem are tested both on the ground and in a real underground roadway environment. Experimental results from the testing show that the signal strength is -45 dBm on average, and the bandwidth attenuation of each hop is less than 10%, the transmission delay after the 11th hop is only 14 ms. The developed emergency rescue communication system is functionally stable, the environmental monitoring subsystem is capable of performing real-time monitoring of various underground environmental parameters, and achieves high accuracy in monitoring.

A process mining approach to improve emergency rescue processes of fatal gas explosion accidents in Chinese coal mines

Gas explosion has always been one of the major accident types in the coal mines of China, and reliable emergency rescue process is one of the key guarantees to minimize accident losses. As an emerging discipline to discover bottlenecks and position deviations of processes, process mining is widely used to improve various business processes in recent years. Nevertheless, scarcely does any research apply it to the field of coal mine emergency rescue to our knowledge. In this study, we apply the technique of process mining to domain of gas explosion accident emergency rescue in coal mines. 50 considerable and major gas explosion accidents, which occurred from the second half of 2006–2014 in Chinese coal mines, are selected as log data. The aspects of control-flow perspective, case perspective, helicopter view, organizational dimension and performance perspective are analyzed by process mining. In terms of control-flow perspective, the emergency rescue model is extracted by the inductive miner in ProM, correspondingly, conformance checking and comparison with real-life model have shown the validity of our work. Research also shows that the average length of cases is 23.72 events, and 60% of the cases are under the average length; 56% of the gas explosion accident emergency rescue processes last less than two days; emergency rescue headquarters, barmaster and medical staff share the highest centrality in social network of rescue; the rescue performance is more affected by accident grade, compared with the factors of accident site, region of coal mine and coal mine ownership.

The Present Situation and Development Trend of Rapid Drilling Technology in Coal Mine Emergency Rescue

When accidents such as inrush of water, fire or falling happened, workers were trapped in a difficult position and rescue team could not approach. How to get through the isolation layer quickly and carry out emergency rescue is the main priority of the rescue team, which have great significance to reduce accident death rate and economic losses. In this paper, we analyze the application status of rapid drilling technology at home and abroad in coal mine accident rescue. When the drilling conditions encountered broken, fractured and other complex issues, we propose the air DTH reverse circulation drilling technology used in mine emergency rescue is feasible.

Study on the Coal Mine Emergency Rescue Information Management System Based on WEBGIS

Based on the actual needs of the national mine emergency rescue base, WebGIS is introduced to the mine rescue and combined with the emergency rescue process to develop the coal mine emergency rescue management information system. This article introduces the systems compositions and relationships, identifies the needs and functional requirements of the system,designs the overall architecture of the system and each subsystem, and sets up the database according to the system functions. At present, the system has been applied to the emergency rescue base. The results indicate that the system can provide technical supports for the emergency rescue effectively.

Research on the Shortest Path of Mine Emergency Rescue Based on Path Weight Adaptive Ant Colony Algorithm

Finding the shortest path is an important issue of coal mine emergency rescue. In this paper, based on Analytic Hierarchy Process theory, the roadway path weight is calculated, thus, influential factors weight on walking speed by roadway attribute is obtained. The establishment of the roadway equivalent length system constitutes roadway equivalent length adjacency matrix combined with path weight. Using adaptive ant colony algorithm and MATLAB software to simulate local roadway of a coal mine domestic, we get the shortest path in mine emergency rescue system, which is more reasonable and less time needed.