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• W2335853992 abstract "the solution of the problem of informational provision of scientific studies in the field of physicochemical gasdynamics. Due to the fact that at present environmental problems are especially acute, a special program Environmental Problems of Heat Engineering was developed within the framework of the AVOGADRO system. The aim of the program is to develop recommendations on minimization of environmental consequences caused by discharge of pollutants into the atmosphere that result from operation of power plants and other objects of the power industry. The main directions of the program are the following: �9 modeling of the process of combustion of solid, liquid, and gaseous fuels with formation of nitrogen and sulfur oxides, polycyclic aromatic hydrocarbons, and soot in various furnaces and combustion chambers; �9 development of methods for suppressing the formation of harmful substances in combustion of organic fuels and also for purification of discharge gases of harmful impurities; �9 study of the chemical composition and dynamics of plumes of thermoelectric plants in the atmosphere; modeling of processes causing formation of acid rain. In what follows we present some results obtained within the framework of the program mentioned in which an important role is played by heat and mass transfer processes. 1. Formation of Fuel NO. A characteristic feature of kinetic processes in the initial section of a dust-coal plume, where discharge and combustion of volatile components take place, is the formation of fuel nitrogen oxides. As experimental data show, clearly defined flame combustion of volatiles near the surface of fuel particles is observed only with ignition of large coal particles having a size greater than 150/~m [2 ]. As the size of the particles decreases and the amount of volatiles that burn up per unit surface of the flame front increases, combustion of volatiles passes from a diffusive to a kinetic regime. In [3] the mechanism of emission of fuel NO is considered. This mechanism involves the kinetics of emergence of volatiles from coal with formation of a combustible gas mixture and the kinetics of chemical reactions in the gas phase, which describes the transition of nitrogen-containing compounds to NO during combustion of volatiles. However, due to the large dimensionatity and the clearly defined rigidity of the kinetic scheme obtained, its realization within the framework of two- or three-dimensional schemes of calculation of turbulent combustion in real combustion chambers runs into great computational difficulties. On the other hand, as is shown in 13 ], the assumption of a purely kinetic regime of combustion of volatiles near a coal particle, even for small coal particles, is insufficiently correct, and to correctly describe this process it is necessary to include into consideration a diffusive mechanism of oxidant supply into the combustion zone, thus leading to even more complication of the problem. Due to the aforesaid, development of simplified kinetic models of NO formation that are based on global (generalized) kinetic schemes is of considerable interest. These models join well with a general scheme of" @default.
• W2335853992 created "2016-06-24" @default.
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• W2335853992 date "1996-01-01" @default.
• W2335853992 modified "2023-09-26" @default.
• W2335853992 title "Results of some studies of formation and transformation of harmful substances during combustion of organic fuels are presented. The studies were conducted wtthtn the framework of the program Environmental Problems of Heat Engineering of the A VOGADRO system." @default.
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