Coal Mine Refuge Chamber Research Articles

Research on Oxygen Supply System of Coal Mine Refuge Chamber Based on Personnel location and Programmable Logic Controller

The refuge chamber provides a safe space where people can stay safe when they are trapped by an accident in a coal mine. The refuge chamber includes several systems such as oxygen supply, air purification, cooling, and dehumidifying. The oxygen supply system is the core of the refuge chamber because it is a closed environment. The oxygen supply time is 96 h according to the relevant standards in America and China. If people stay in the refuge chamber for more than 96 h, the oxygen supply may not be enough, and they can be in danger. It is necessary to efficiently use oxygen and extend the oxygen supply time. Based on the experimental platform of the refuge chamber, this paper conducts an in-depth study on the automatic control of the oxygen supply system. The oxygen supply system and the harmful gas removal system can be automatically and efficiently controlled by the programmable logic controller (PLC) according to the personnel number and the oxygen concentration. The experiment has proved that the system is good and reliable.

Correction to “Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber”

RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to “Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber”Wen-mei GaiWen-mei GaiMore by Wen-mei Gai, Long-zhe JinLong-zhe JinMore by Long-zhe Jin, and Yan Du*Yan DuMore by Yan DuCite this: Ind. Eng. Chem. Res. 2019, 58, 33, 15379Publication Date (Web):August 7, 2019Publication History Published online7 August 2019Published inissue 21 August 2019https://doi.org/10.1021/acs.iecr.9b03826Copyright © 2019 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views330Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (164 KB) Get e-Alerts Get e-Alerts

Experimental Study of the Gas Leakage and Optimized Supply of Oxygen in Coal Mine Refuge Chamber

Abstract The basic function of a refuge chamber is to maintain reasonable concentrations of O 2 , CO 2 , and CO. The supply of compressed oxygen in a refuge chamber is always limited. Therefore, it is vitally important to determine how to make the most effective use of compressed oxygen and maximize its supply time. In this paper, we determine the basic law of gas leakage in refuge chamber and reveal that the higher is the pressure in the refuge chamber, the more oxygen leakage occurs. We examine the law of supply and consumption of compressed oxygen and its interrelationship with the air cleaning system. An excessive supply of compressed oxygen only serves to increase its consumption with no positive effect on air quality. However, air cleaning systems can not only decrease the carbon dioxide concentration but also increase the oxygen concentration. Therefore, the compressed oxygen supply and air purification system must be simultaneously enabled to maintain a reasonable air concentrations in the chamber. And the oxygen supply rate should be dynamically adjusted according to human need.

A novel and green CO2 adsorbent developed with high adsorption properties in a coal mine refuge chamber

A novel and modified soda lime with higher adsorption rate and capacity was developed. According to the multi-index orthogonal experiments, the best combinations of soda lime with different mass fractions is CMSS 8.5%, H2O 10.5% and NaOH 8.5% and the order of influence on CO2 adsorption rate of different compositions (mass fraction) is NaOH > H2O > CMSS. The modified soda lime was characterized by using various techniques for their pore structure and surface area. The porosity of optimal soda lime is 27.13%, total pore volume 0.19 mL/g and total surface area 6.10 m2/g. The Langmuir isotherm model fitted best among the three isotherm models, indicating the maximum adsorption takes up at 25 °C. The CO2 adsorption kinetic study was performed by using two kinetic models, and the second order was found fitted best with the experimental data with maximum error% of 2.28%. The adsorption rate still remains at a high level in an environment with high temperature and high humidity (humidity 70% and temperature 30 °C). Moreover, technical parameters appropriate for engineering applications were analyzed and calculated. It can be concluded that the novel adsorbent has several advantages, such as its being lower in cost, higher in efficiency, more stable in nature, higher in strength, few in secondary pollution and lower in dust outflow. It was demonstrated that the adsorption capacity increased by 36.2% and the adsorption rate increased by 39.5%.

Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber

In coal mine safety, providing and maintaining a safe closed environment and reducing the casualties of coal mine disasters are a long-term challenges. A novel and modified soda lime with higher adsorption rate and capacity was developed through analyzing the reaction mechanism and adsorption factors. The best combinations of soda lime with different mass fraction is additives 6%, H2O 12%, and NAOH 6%, while the best working modes is 25 W fan power, 8 cm thickness, and S-5 soda lime according to the multi-index orthogonal experiment. The order of influence for CO2 adsorption rate of different compositions (mass fraction) is NaOH > H2O > Al2O3, and the order of influence in different working modes is fan power > thickness > the type of soda lime. Through the optimization design, the novel soda lime is easy to form without binding together in the process of adsorption for CO2 and the dust outflow reduced by about 50%. The adsorption rate still remain at a high level in a high temperature and high humidity e...

Failure Mode Analysis and Dynamic Response of a Coal Mine Refuge Chamber with a Gas Explosion

A gas and coal dust explosion is potential hazard in majority coal mines. A coal mine mobile refuge chamber is a new class of device for miners those who are unable to escape after an accident which can provide basic survival conditions. In this paper, in order to study the propagation law of an underground methane/air mixture explosive wave, and check the failure mode of a coal mine mobile refuge chamber, a full-sized underground tunnel model and a refuge chamber model have been established in ANSYS/LS-DYNA (LSTC, R7.0.0, Livermore, CA, USA, 2014). The simulation results show that the reflected wave pressure on the front surface of the refuge chamber was about twice as high than the incident wave. The pressure on various locations of the chamber was also analyzed. When the peak pressure of the explosive shockwave reached 0.64 MPa, the maximum displacement and stress occur at the center of the front door and the joint of stiffeners and the front plate, respectively. Most parts of the coal mine mobile refuge chamber were in a plastic failure state and the refuge chamber could be defined as damaged. The front door, the front plate, the connecting flange, and the stiffeners on each side were the primary key components. In the end, suggestions were proposed for the refuge chamber.

Potassium superoxide oxygen generation rate and carbon dioxide absorption rate in coal mine refuge chambers

The effects of the molding pressure of a KO2 oxygen plate and the initial concentration of CO2 on the oxygen generation rate, the oxygen generation efficiency, and the carbon dioxide absorption rate were studied using a YES-300 hydraulic press to alter the pressure when forming the oxygen plate used in a coal mine refuge chamber. In addition, changes in the initial concentration of CO2 used in the closed-box model were made by adjusting the CO2 supply system, and a CD-7 multi-function parameter instrument was employed to monitor and record the changes of O2 and CO2 concentration in the closed-box model. Results indicate that the oxygen generation rate of KO2 oxygen plates, the oxygen generation efficiency, and the carbon dioxide absorption rate decrease when there is an increase in the pressure used to mold the oxygen plates, but those values increase when the initial CO2 concentration increases. When the initial concentration of CO2 in the closed-box model is 3.5% and the forming pressure is 10kN, the average oxygen generation rate of 15g KO2 oxygen plate is 11.88×10−3L/min, the oxygen generation efficiency is 80.3%, and the average CO2 absorption rate is 11.0×10−3L/min. Compared with the condition where the initial CO2 concentration is 1.5%, the results show that average oxygen generation rate of oxygen plates increases by 88.9%, the oxygen generation efficiency increases by 88.9%, and the CO2 absorption rate increases by 100%.

Refrigerating characteristics of ice storage capsule for temperature control of coal mine refuge chamber

Heat transfer process and refrigerating characteristics of ice melting enclosed in a cube capsule are investigated using experiments and mathematical relations to achieve temperature control by ice storage in coal mine refuge chamber. The effective refrigerating time for ice storage capsule is defined and tested. The mathematical relations of the effective refrigerating time and refrigeration rate are derived and modified. The correction factor equation of ambient temperature and humidity is established for the revision of mathematical relations. By using the modification factor equation, the mean relative error between modified and experimental values is less than 1%. The three application parameters, namely tmodified, Ncapsule, and Nt,capsule are obtained based on the experiments and the modified relations. These parameters form the temperature control strategies in using ice storage capsule for refuge chamber. A 24-h manned experiment verifies the accuracy of the temperature control strategies.

Microstructure and Mechanical Properties of 1,000 MPa Ultra-High Strength Hot-Rolled Plate Steel for Coal Mine Refuge Chamber

The 1,000 MPa ultra-high strength hot-rolled plate steel with low-carbon bainitic microstructure was developed in the laboratory for coal mine refuge chamber. The static recrystallization behavior, microstructure evolution, and mechanical properties of this hot-rolled plate steel were investigated by the hot compression, continuous cooling transformation, and tensile deformation test. The results show that the developed steel has excellent mechanical properties at both room and elevated temperature, and its microstructure mainly consists of lath bainite, granular bainite, and ferrite after thermal–mechanical control process (TMCP). The ultra-high strength plate steel is obtained by the TMCP process in hot rolling, strengthened by bainitic transformation, microstructure refinement, and precipitation of alloying elements such as Nb, Ti, Mo, and Cu. The experimental steel has relatively low welding crack sensitivity index and high atmospheric corrosion resistance index. Therefore, the developed steel has a good balance of strength and ductility both at room and elevated temperature, weldability and corrosion resistance, and it can suffice for the basic demands for materials in the manufacture of coal mine refuge chamber.

Simulation and Analysis of Anti-Explosion Capability for Coal Mine Refuge Chamber

Experiment research aiming at the anti-explosion capability of the refuge chamber is a complex work with high costs. By using finite element analysis, however, could avoid this issue and implement the simulation and analysis more effectively. Based on transient dynamics approach, numerical simulation calculation and analysis of the dynamic response of the refuge chamber under the impact caused by gas explosion are presented in this paper. The results indicate that, when the refuge cabin under specified explosion impact wave stress, the maximum stress of the cabin is 370.8MPa,which is under the ultimate strength, and the maximum impact wave deformation of the cabin is 9.43mm, which is under the maximum permissive deformation (20mm), therefore the rigidity and the strength of the cabin both meet the demands. The refuge chamber presented in this paper, which remain the integrity of the cabin and the safety of the structure under specified explosion impact, has good anti-explosion ability, and could implemmet the emergency risk avoiding effectively.

Pressure characteristics and dynamic response of coal mine refuge chamber with underground gas explosion

Coal mine refuge chambers are new devices for coal mine safety which can provide basic survival conditions after gas explosion. In order to simulate the propagation of underground methane/air mixture blast wave, and check structural safety of coal mine mobile refuge chamber, an underground tunnel model and a refuge chamber model have been established based on explicit nonlinear dynamic ANSYS/LS-DYNA 970 program. Results show that the reflected wave pressure on the impact surface was about two times higher than that on the incident one. The relationship between the pressure fields of the chamber was analyzed. The maximum pressure of gas explosion reached about 0.71 MPa, and the pulse width was 360 ms. The maximum absolute displacement and stress occurs at the main door center and the connection of stiffeners and the front plate, respectively. The entire coal mine mobile refuge chamber was in elastic state and its strength and stiffness meet the safety requirements. The cabin door, the front plate and the connecting flange at cabin back as well as the stiffeners on each side were the most critical components. Suggestions were put forward for the refuge chamber.

Study on purification characteristic of CO2 and CO within closed environment of coal mine refuge chamber

Provide and keep a safe closed environment within refuge chamber to reduce casualties in mine disaster remains a longstanding challenge under the work of coal mine safety. Toward this objective, the CO2 and CO circulation purification experimental study was carried out with six kinds of decontaminants (LI-1, CA-1, NA-1, PD-1, AU-1, HC-1) by mean of the simulation device of closed environment of refuge chamber. The experimental results showed that, LI-1, CA-1 and NA-1 have the ability of CO2 absorption, while PD-1, AU-1 and HC-1 have the ability of CO oxidation, and there was an optimal space velocity value for each which cost shortest reaction time and had maximum reaction rate. Through the function fitting and mathematical analysis, the relationships between reaction rate and gas concentration and the maximum reaction rate order of six decontaminants were obtained under the experimental conditions. Further analysis shows that, three kinds of CO2 decontaminants (LI-1, CA-1, NA-1) and two kinds of CO decontaminants (PD-1, AU-1) were able to meet the requirements of the relevant standards respectively when the CO2/CO purification rate under the optimal space velocity value conditions, and that could actually be used in purification of CO2/CO in refuge chamber, while the CO2/CO concentration would fluctuated around certain average values theoretically. The results of this study has some guiding significance for the theoretical research and practical application on controlling the concentration of CO2 and CO in closed environment with technology of circulation purification.

Status quo and prospect of the development for underground coal mine refuge chamber

As one form of the energy resources, coal is becoming more and more important. Due to the particularity in coal mine production, mine accidents some time occur in countries all over the world, which result in large casualties and economic losses. As equipment that can provides the miners with an emergency shelter when the coal mine accidents occur, the underground coal mine refuge chamber is paid more and more attention by coal mine enterprises, and the application of the refuge chamber is increasingly widespread. The general functions, the classification, and the successful applications of the underground coal mine refuge chamber are illustrated first, and the research significance on the underground coal mine refuge chamber is stated. Following, the development status quo at home and abroad for the refuge chamber is introduced. Then, the implementation methods for the key functions of the underground coal mine refuge chamber are demonstrated. Finally, the prospect for the development of the underground coal mine refuge chamber is stated.

Research on Performance of Coal Mine Refuge Chamber Reinforcing Ribs

The coal mine refuge chamber is the necessary production of emergency system used in the underground coal mine. It can be installed conveniently and moved with the workplace. So it is more widely applied. The composition and basic performance requirements of coal mine refuge chamber were introduced in this paper. The performance of reinforcing ribs was done by finite element analysis software ANSYS Workbench and the performance optimization method of square tube reinforcing ribs thin plate was proposed. It can provide some reference for the design and performance research of refuge chamber bulkhead.

Design of Underground Coal Mine Refuge Chamber

In recent several years, coal mine tragedies had happened frequently in Chinese, a minimum life sustaining atmosphere would need to be developed to design any sort of refuge chamber for entrapped miners to await mine rescue teams. Parameters such as oxygen consumption rate, carbon dioxide exhalation rate, and maximum allowable temperatures inside such a chamber for human survival had to be defined.

Structure Analysis and Design of Coal Mine Refuge Chamber

Removable steel refuge chamber is a very important device for lifesaving in coal mine disasters, such as fire, gas explosion, roof fall, and so on. So the chamber body should have good stiffness, strength, and tightness under disaster conditions. The stiffener structure in refuge chamber body has been investigated with FEM, and a kind of design was suggested.

Research on Optimization and Decision Making Methodology in Technology Design of Coal Mine Refuge Chamber

In this paper, an effective optimization and decision making method was proposed to deal with the multiple attribute decision making problems in technology design of coal mine refuge chamber. It is more reasonable that both attributes’ subject weights assessed by experts (DMs) and intrinsic weights inside the alternatives are taken into account. The main factors, which affected DMs’ decision making, were analyzed and subdivided to 14 elements, and then a MADM model for chamber design was introduced subsequently. A case was studied to demonstrate the application of the model, and the results show that the chamber’s capability of withstanding overpressure, temperature control, flexibility and investment cost are crucial elements which are connected with the product’s superiority and should be paid more attention in technology design.

Probing Into Design Of Refuge Chamber System In Coal Mine

Put forward the refuge chamber system composed by permanent refuge chamber, temporary refuge chamber and rescue capsule, which are mutually independent and tightly-coupled, to cost-effectively radiate all the areas with mining activities and protect personnel in mine. In addition, in order to promote the development of refuge chamber system in Chinese coal mine, propose some basically design principles of refuge chamber system and describe the arrangement principles and structure characteristics of three kinds of refuge space in the process of underground refuge chamber system design and construction. It is a significant reference for coal mine refuge chamber system construction in China.