The dissertation is devoted to the decision of an important scientific and technical task, namely, the development of scientifically substantiated recommendations on the use of the index of ignition temperature as an express evaluation of the vagueness of the coal entering the coking.
The existence of systematic deviations of the actual values of the combustion temperature of mixtures from the additivity-based rule in the direction of coal with a lower ignition temperature has been established. The methods of mathematical statistics prove that these deviations are significant non-random variables. It is assumed that the mixture primarily deals with a component with a lower ignition temperature, and the energy emitted at the same time is spent on burning more difficult flammable component, which leads to ignition of the mixture as a whole.
It is established that the temperature of ignition of coal of various degrees of metamorphism and oxidation practically entirely depends on the heating rate. According to the developed mathematical equation, it is possible to calculate the temperature of ignition of the investigated coal in the range of its heating from 2 to 7 °C / min.
The study of the interconnection of the composition, structure and technological properties of coal of Ukraine, the USA, Canada, Australia, the Czech Republic, Poland, Indonesia, etc. with the temperature of ignition of the recovered (unoxidized) coal. It is established that the temperature of ignition is a technological parameter, which depends on the composition and degree of regulation of the organic mass of unoxidized coal.
The values of ignition temperature of unoxidized (recovered) coking coal of separate marks and groups are calculated within the limits of DSTU 3472:2015.
It is established that the use of the index of ignition temperature of unoxidized coal (tzv) allows to timely reveal the inconsistency of the actual brand affiliation of the coal with the declared brand, to carry out the priority complex of investigations of the properties of this coal and, taking into account the obtained data, to take measures to maintain the specified branded composition and properties of coal charge, and as well as stabilization of the quality of produced blast furnace coke.
It is estimated that the economic effect of using the ignition temperature to control the branded composition and quality of coal concentrates will be to prevent damage from unplanned changes in the quality parameters of the coking charge that affect the yield and quality of gross and blast furnace coke.
Key words: coal, coal mixtures, ignition temperature, kinetic parameters, quality indices, quantitative dependencies.
