Refuge Chamber Research Articles

Structure Design and Antiknock Performance Analysis of New Mine Refuge Chamber

In order to solve the potential safety problem due to the explosion of coal mine caused the severe deformation of the front door not being opened normally and the emergency escape hatch was designed unreasonably, three types of structure model with emergency escape hatch being set in transition compartment as entrance and different locations of life supporting compartment as exit, which can avoid the potential safety problem above mentioned. Numerical simulation of antiknock impact performance of the three refuge cabins were calculated and analyzed by using the finite element software of LS-DYNA.The results indicated that the antiknock performance of structures could reach specifications, which could provide a new idea for the development of mine refuge chamber cabin.

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.

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.

The R&D of the Emergency Rescue Vehicles Based on Borehole-Type Refuge Chamber

So far, the control rooms require a lot of manpower and material resources to repair and maintenance. They are above the borehole-type refuge chamber. It is also possible that the equipment in control rooms is aged and the necessities are overdue. When an emergency appears, it can detain the rescue. Therefore, a kind of emergency rescue car for permanent drilling shelters is developed. It can replace the control room. It combines with relevant regulations, through counting, based on the conditions of mines affiliated to Jizhong Fengfeng Energy Group. The air supply system, the power supply system, the flow food system and the communication system of monitoring and controlling are designed in the car. After conducting laboratory experiments, the model of appropriate emergency rescue car, the types of functional equipment are determined. The layout and connections of each system are also designed in the car. These are based on the data and theories concluded from theoretical analysis.

Design and Antiknock Impact Performance Analysis of New Mine Refuge Chamber Cabin of Waterproof and Antitoxic

The emergency escape hatches of refuge cabin are usually installed in both sides of the life supporting compartment, which might cause the toxic gases or water enter into life supporting compartment when the gas explosion and water inrush accident occur. A new type of refuge cabin structure that can effectively resist the toxic gases and water entering the life supporting compartment is developed in this paper. Numerical simulation of antiknock impact performance of the new refuge cabin was calculated and analyzed by using the finite element software of LS-DYNA.The stress and strain distributions and maximum antiknock performance were obtained. Refuge chamber cabin has been optimized to reduce cost. The antiknock impact performance of optimized mine refuge chamber cabin can reach 1.4MPa which is greater than the 0.6MPa of standard value and the cost can be reduced approximate 19% than the original model.

Research on the Protective Device of Outside Environmental Monitoring System for Refuge Chamber

In order to protect the components of monitoring, some measures should be taken when refuge chamber uses outside environmental monitoring system. This paper designs a kind of protective device for outside environmental monitoring system based on related theory analysis and coal mine environment. It can protect monitoring components from gas explosion shock wave. Meantime there is good contact between sensitive element and outside environment to guarantee the normal work of the monitoring system. Finally, this paper builds the model of protective device, and analyses its structural strength.

The Thermal Insulation Design for Refuge Chamber

For provide outstanding thermal insulation capacity for the refuge chambers, this paper firstly put forward a 5 layer heat insulation structure for refuge chambers. Mineral wool and acrogel were used as the heat insulation materials because of their excellent heat insulation and fire resistance capability. Then the paper determined the thickness of each layer by theoretic analyze using heat transfer theory, and found two 10 mm layers of acrogel and a 62mm layer mineral wool were ideal thickness. Then the paper designed the cooling system, according the heat analysis. And found the ice cake was best fit for refuge chambers, but it must equip with air flue to keep the enclosed air flowing. At last, 8 people were employed in the closed chamber for 106 hours, and raised outside temperature to 55°C for 5 hours. The chambers inside temperature was most controlled under 35°C. Then the paper increased the thickness of acrogel layer according to the experiment results at last. Theory analysis and experiment show that the designed heat insulation structure and cooling system had an excellent thermal protection capability.

Structural Design and Analysis of the New Mobile Refuge Chamber

At present, the mobile refuge chambers are mostly used square or circular structures. Based on these researches, a new chamber structure is presented in this paper, which is square and circular combined structure. The size and connection way are designed through the analysis of the working conditions and the requirements of the installation, transportation, maintenance and so on. Then the new structure is simplified to four kinds of cabin model, which can be analyzed by the ANSYS software. By the simulation analysis the reliability of the new structure is determined, which provides a theoretical basis for guiding the structural design of the mobile refuge chamber.

Experimental Study on Oxygen Supply Performance Influence Factors of Potassium Superoxide Oxygen Board Used in Confined Space

Oxygen supply is the primary factor in ensuring human survival in confined spaces. Compared with high pressure oxygen bottles, potassium superoxide oxygen board has advantages such as small size, large oxygen storage per unit volume, absorbing carbon dioxide while providing oxygen. However, the release rate of chemical oxygen in a confined space relates to the concentration of carbon dioxide, temperature, humidity and other environmental parameters. To meet human survival needs within the refuge chamber, this paper made experiments on potassium superoxide oxygen production performance factors, including humidity test, carbon dioxide concentrations test, surface spray wet test and so on. Through tests the amount and the rate of oxygen production, and the removal efficiency of carbon dioxide of potassium superoxide in different situations are obtained. And through a human survival experiment, the potassium superoxide oxygen board can satisfy the human body needs is validated. These all provide basis for the establishment of auxiliary oxygen supply facility in the refuge chamber.

Test Research for Thermal Protective Properties of Mobile Refuge Chamber

In this paper we have a discussion on heat insulation method of the using of mobile refuge chamber for coal mine and the improved scheme was put forward to improve the performance of thermal protective properties of the refuge chamber. Then according to the theoretical analysis and the external heating test methods to be compared,we conduct an analysis.The test method are introduced, and the factors caused the temperature changes are analyzed based on the test.These results have directive significance for the further improvement of refuge chambers.

Study on System Design of Coal Mine Underground Permanent Refuge Chamber

This paper introduces the function and meaning of permanent refuge cavern construction of coal mine. According to the composition of the permanent refuge cavern system, functions of other subsystems, construction site, daily maintenance and harmonious and unified of each system operation, design and study of the system have been introduced in this paper. Focus on the analysis of the specific characteristics of each subsystem and the contents of each subsystem required quantization, provide the basis for the design and construction of coal mine permanent refuge chamber.

Study on New Emergency Refuge Chamber of Coalmine Underground

This study introduces the current situations of the research on the refuge chamber at home and abroad. Aiming at disasters prevented and environment for refuge chamber, it deals with the chamber's protection and positioning, notes for selection of chamber sites, reference sizes and requirements of strength and impermeability. Some designs for survival system in the refuge chamber are structured, including multistage oxygen supply, air cleaning system, temperature and humidity control system, dynamical system, monitoring and communication system, etc.

Image denoising algorithm of refuge chamber by combining wavelet transform and bilateral filtering

In order to preferably identify infrared image of refuge chamber, reduce image noises of refuge chamber and retain more image details, we propose the method of combining two-dimensional discrete wavelet transform and bilateral denoising. First, the wavelet transform is adopted to decompose the image of refuge chamber, of which low frequency component remains unchanged. Then, three high-frequency components are treated by bilateral filtering, and the image is reconstructed. The result shows that the combination of bilateral filtering and wavelet transform for image denoising can better retain the details which are included in the image, while providing better visual effect. This is superior to using either bilateral filtering or wavelet transform alone. It is useful for perfecting emergency refuge system of coal mines.

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.

Study on open-cycle carbon dioxide refrigerator for movable mine refuge chamber

For a movable mine refuge chamber, the refrigeration system is important to remove miners' body heat and the heat input from the hot outside environment. The refrigeration cycle has been changed from closed cycle using traditional Freon refrigerant to open cycle using high pressure carbon dioxide. The open cycle refrigerator has no compressor and it consumes no electricity. The open system is composed of a Joule–Thomson (JT) valve, an evaporator, a capillary heat exchanger, a pneumatic blower and several connecting tubes. For the evaporator, a stainless steel heat exchanger as well as a smooth tube heat exchanger were designed and tested and compared with a conventional finned tube copper heat exchanger. The tests show that the performance of cooling and dehumidification is nearly the same for the three heat exchangers. Because the stainless heat exchanger has higher strength and lower cost than the two others, it might be the best choice in actual applications. A long capillary tube heat exchanger is used to decrease the carbon dioxide pressure from around 20–35 bar to 5 bar, and at the same time the gas is kept above a temperature of 10 °C by making use of the sensible heat.

Design and Analysis of the Six Systems of Refuge Chamber in Coal Mine

The refuge chamber is an important part of the emergency refuge system in coal mine. This paper mainly introduced the design ideas of underground layout, structure, six systems of disaster prevention system, life support system, life support and emergency system, power supply system, communication system and external disaster information detection system in refuge chamber. This provides a scientific design basis for constructing refuge chamber in the coal mine.

Design Scheme of Outside Environmental Monitoring System for Coal Mine Mobile Refuge Chamber

The paper mainly introduced research state of coal mine mobile refuge chamber and its outside environmental monitoring system, analyzed particularity of chamber-outside environment and design requirements of outside environmental monitoring system for coal mine mobile refuge chamber, and put forward design goals and idea of software design, hardware design and protective device of outside environmental monitoring system for coal mine mobile refuge chamber. It put forward a design scheme of outside environmental monitoring system for coal mine mobile refuge chamber according to the actual applications and design goals. The design scheme consists of software, hardware and protective device. And it detailed expounded environmental monitoring system’s working principle, signal transmission principle and workflow. The paper can provide technology reference for development of outside environmental monitoring system for coal mine mobile refuge chamber in China.

Coal Mine Mobile Refuge Chamber with Square Cross Section Structure Finite Element Analysis

Coal mine mobile refuge chamber, as the important equipment of underground refuge system, has a close relation to the life safety of the miners. At present, there are a lot of production refuge Chamber manufacturers, but they do not enjoy a unified standard in shape or size. This paper focuses on the establishment of the KJYF96/10 mobile refuge chamber model by Solidworks and adopts the structural finite element analysis by Simulation, drawing a conclusion of refuge chamber stress and displacement cloud chart. It is expected to offer an effective reference to improving the structure strength and reducing design costs.