Abstract
The objective of the paper was to review and to assess the propensity of selected peat dusts to self-ignite. A comparison was carried out of the impact that the volume of dust storage exerts on values of the self-ignition temperature. The necessity of increasing peat share in generation of energy forced the investors to re-design or create from scratch a new technology. Due to differences between combustion of the fuel - biomass and coal - also the safety issues required a completely new approach. Therefore, this article presents factors that affect spontaneous heating and self-ignition of peat on its self-ignition properties when stored in bulk. The values of experimentally determined temperatures of self-ignition for peat are included. The research was performed in compliance with methods specified in PN-EN 15188:2009. The were used three types of dusts having varying crushing levels and level acidity. Based on the analysis of results, it was determined that analysing the self-ignition tendency of the examined dusts is of informative nature and it can differ from the actual conditions prevailing when stockpiling the examined peat dusts.
Highlights
The phenomenon of self-heating, which can lead to self-ignition of materials, is dangerous in various branches of industry, e.g. in mining
This article aims at evaluating the susceptibility of peat on its spontaneous heating and self-ignition properties
The research was conducted in compliance with the standard used for determination of self-ignition tendency in accumulated dusts acc. to PN-EN 15188:2009
Summary
The phenomenon of self-heating, which can lead to self-ignition of materials, is dangerous in various branches of industry, e.g. in mining. Endogenous fires on peat or coal depots in power plants, which result from self-ignition of coal, are caused by oxidation that generates heat which is accumulated in the material and not carried away. Explosive and ignition properties of the peat dust and coal dust used in power plants are very different They depend, inter alia, on type and origin of a given fuel, granularity and moisture content. Dust clouds and deposits can form during such processes When such a mixture starts to ignite, an explosion may occur, generating a pressure wave and a flame front that follows it. Self-heating of peat dust, that precedes self-ignition, is the consequence of a series of chemical reactions, physical or biological processes that occur in the given material. For most self-ignitable substances, oxygen in the air is necessary for chemical reactions
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