Estimation of TNT equivalent of detonating explosive gas

The purpose of the study was to compare the genuine work of explosion of detonating gas and trinitrotoluene during their reaction in the form of detonation. The comparison was done in the framework of the concept of the strength of the explosives as the ability of their degradation products to perform work under isentropic expansion, starting from the initial state in which the products of instant explosion are located. The study introduces the calculation data using the gas equation for products of detonation of a detonating gas at different initial pressures, and the Johns-Wilkins-Lee (JWL) equation for trinitrotoluene. With a high-explosive effect characterized by a final pressure of the order of a tenth of a megapascal, in which the explosion products are still able to perform the required form of work, the relative TNT equivalent of detonating gas will rise from about 50% to 110% with an increase in the initial pressure of the gas charge from a normal value to one megapascal.

Analysis on Explosion Characteristics of Coal Gangue Hills

In the process of the coal gangue hill explosion, a lot of harmful gases can be released, which seriously pollutes the atmospheric environment and is harmful to people’s health; meanwhile, equipments and the surrounding buildings can also be destroyed, which brings huge economic losses and casualties. In addition, social problems caused by coal gangue hills will become a thorny problem for coal enterprises. Therefore, the influencing factors on the coal gangue hill explosion, the explosion characteristics and laws, and the spontaneous combustion process of the coal gangue hill are analyzed; the coal gangue hill explosion are discussed from the arch shell theory, the bottom air leakage and oxygen supply, rainfall, detonating gas explosion, and chain reaction; the conditions, influencing factors and characteristics of the coal gangue hill explosion are obtained.

The Research and Implementation of Electrostatic Detonating Gas Simulation Experiment System Controller Based on Nios II

The electrostatic discharge detonating gas simulation experiment system based on Nios II is developed in this paper.This system uses flexible and highly efficient SOPC technology,which embeds many functional modules.The system can simulate the mine gas environment, measure the oxygen, temperature and the gas concentration that most likely detonating gas, and real-time display in the LED screen, so as to obtain important data of gas explosion in coal environmental, which provide theoretical and experimental basis for farmulating standards of electrostatic security of human body and the safety of production in coal mine. It can conduct a series of experiments about electrostatic discharge of human body detonating gas mixture.

WC-Co Detonation Coatings Having a Hybrid Amorphous-Nanocrystalline Structure Display Improved Properties

X ray diffraction and transmission electron microscopy studies and measurements of hardness and void content were carried out for WC-20% Co coatings produced by detonation flame spraying at various oxygen/acetylene ratios in the detonating gas mixture. It was demonstrated that successive transition from (WC+Co) to (W2C+Co3W3C) to (W+CO7W6) occurs as the oxygen content in the mixture is increased, and that amorphous-nanocrystalline structures form in the coating. Two types of these hybrid structures were revealed, one including an amorphous metallic matrix containing precipitates of intermetallic nanocrystals, the other having an amorphous oxide matrix and nanocrystalline precipitates of CO3O4 and WO3. The hybrid structures were shown to improve coating density and hardness.