Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: methane-air mixture

Sortuj według:

Ogranicz wyniki do:

Modeling the corrosive destruction of underground degassing pipelines

Yegorchenko Rostyslav, Yavorskyi Andrii, Dyachkov Pavel

Mining Machines

2023

vol. 41, iss. 4

220--230

The general frequency of development of pitting corrosion was established, taking into account the results of the analysis of mine waters and foreign materials, which are favorable conditions for theformation of corrosion of steel degassing pipelines. A base of initial data was created for modeling the corrosion process of a steel degassing gas pipeline at different points in time: the beginning of the corrosion process, its development, and the end of the process. Stress distribution, corrosion potential,as well as anodic and cathodic current densities depending on the size of the corrosion crack and the longitudinal deformation of the rocks of the sole of the production was analysed.Ithas been proven that the high level of corrosion processes of underground pipelines is the result of the interaction of the metal, which acts as an electrode, with groundwater, which acts as anelectrolyte, while the determining factors of the corrosion process are the electrical conductivity of the rocks of the bottom of the mine and the deformation processes in the pipelines. The reason of low service life of underground degassing pipelines, which are constantly exposed to mechanical and electrochemical corrosion, have been established.

Some Remarks on the Safety of Methane Penthrite Detonating Cords against the Inflammability of a Methane-Air Mixture

Zawadzka-Małota Iwona, Sałaciński Tomasz

Central European Journal of Energetic Materials

2022

Vol. 19, no. 2

181--203

After analysing literature data some topics related to the properties and testing methods of detonating cords (DCs) are presented. The main attention is paid to the 2,2-bis[(nitrooxy)methyl]propane-1,3-diyl dinitrate (penthrite, PETN)-based DCs. In a case study of methane PETN DC, it is shown that the problem of DCs being able to fulfil safety precautions as permitted explosives is very complex, i.e. to determine their ability to ignite a methane-air atmosphere in coal mines. The tests have shown that the relationships between safety and the performance properties of methane PETN DC are not obvious. For example, an increase in the outer thickness coating of this methane PETN DC, causes the inflammability of a methane-air mixture to be decreased. Moreover, an increase in the amount of crystalline PETN in the cord’s core caused an increase in its velocity of detonation, but had no impact on its ability to ignite a methane-air mixture in the experimental gallery.