Abstract
Abstract The article is a summary of information about evaluation of a risk degree for a brown coal spontaneous ignition which is realized on the base of a database analysis of information about the development of stative quantities and desorbated gases in the stored bodies of the brown coal. The data were gained from the long term complex measurements which were realized at chosen companies during the coal mining in the previous parts of the project. In the last part of the project, we examined results of temperature models from thermographs with results of gasses and coal samples from the mines. Then, the influence of atmospheric conditions (insolation, water downfall, changes of barometric pressure etc.), the influence of coal mass degradation, the influence of physical and chemical factors, and the influence of other defective factors on the process of the coal spontaneous ignition. The gasmetry was assess with gas in-situ samples and laboratory gas models of indicative gasses for the spontaneous ignition, which were taken from the method of the thermic oxidation with the aim of the correlation finding for an epicentre of temperature within the spontaneous ignition.
Highlights
The correction of a measuring model, the determination of climatic conditions influence, the determination of physical and chemical parameters degradation influence and another failure factor influences to spontaneous ignition processes were realised on the grounds of a long term operating coal dumps measurement analysis
The principles of the estimate of the temperature of a spontaneous ignition epicentre were realised on the grounds of desorbated gases operation sampling with application of verified spontaneous ignition indicative gases figures
The creation of the simplified steam epicentre model was realised with application of the combination of a temperature field statistical – mathematical description and physical – chemical analysis
Summary
The correction of a measuring model, the determination of climatic conditions influence, the determination of physical and chemical parameters degradation influence and another failure factor influences to spontaneous ignition processes were realised on the grounds of a long term operating coal dumps measurement analysis. The creation of the simplified steam epicentre model was realised with application of the combination of a temperature field statistical – mathematical description and physical – chemical analysis. The main factors are [3, 6, 8]: mathematical – physical diagnostics for optimal temperature mapping of the dump (dumps, caving), evaluation of non-stationary partial differential equation of heat leading for the stock body with a Newton tangential condition on the surface of the dump and with heat sources presenting the development of the steam reaction, processing and interpretation of experimentally discovered physical and chemical quantities in theoretical calculations and models, proposals of some experiments and measurements „in situ“ according to the requirements of the theory, experimental findings in the fields of dynamics of the coal spontaneous ignition (incubation) and the critical temperature of the coal spontaneous ignition. The model has two domains: Heap – coal Wind – airflow of the heap by the wind
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
