RESEARCH OF BROWN COAL BURNING PROCESSES IN THE VORTEX FIREPLACE BY COMPUTER MODELING

Abstract

As part of the course for European integration in Ukraine, a new Energy Strategywas approved to reduce the share of coal among primary sources to 12.5 % by 2035, the share ofelectricity generation at TPPs and CHPs to 3 2%. In 2021, Ukraine joined the EU's Green Dealstrategy with a commitment to completely stop coal production and close coal energy and close coalenergy by 2050.At the same time, coal energy has advantages - significant reserves of domestic coal (first inEurope and eighth in the world), which make it a guarantor of energy independence.Given the growing share of "green" generation in Ukraine, the share of pulverized coalproduction should be kept at least 30% of total energy productionThe use of expensive imported natural gas in Ukraine's fuel balance stimulates the developmentof industrial and small energy based on cheap local fuels and combustible waste. The use of cheapcoal, peat, wood waste can reduce the cost of heat production in housing and communal services,industrial enterprises.Combustion of low-grade fuels is constrained due to the complexity of organizing a sustainablecombustion process.Local fuels are characterized by high humidity and ash content, low heat of combustion. Thezone of autogenous (self-sustaining) combustion is defined by the limits: combustible - more than25 %, moisture - less than 50 %, ash - less than 60% by working weight.Vegetation and wood are the starting point for the stages of metamorphism (carbonization):plant residues, peat, brown coal, coal, anthracite. Characteristics of humolites, the organic part of the fuel, by stages of metamorphism. Fuels ofdifferent types and different degrees of carbonization - peat, lignite is peroxidized and contain a lotof oxygen in the combustible mass, have the lowest thermal stability and the highest yield of volatilesubstances.In the process of metamorphism, oxygen is removed and the thermal stability of the organicmatter of the fuel is increased.