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Alekhnovich A.N.,JSC Ural Heat Engineering Laboratory | Chernetskiy M.Y.,RAS Kutateladze Institute of Thermophysics | Bogomolov V.V.,JSC Ural Power Engineering Company
Power Technology and Engineering | Year: 2016

On the understanding that the characteristics of the gas flow have a major contribution to slagging, a change in the fineness of pulverized coal necessitates taking into account the change in the properties of fly ash, which can either improve or worsen the slagging situation. A decrease in the pulverized coal particle size leads to a reduction of the fly ash particle size, an intensification of the formation of friable deposits, and an increase in the degree of conversion of pyrite to solid iron oxides. This reduces or prevents the formation of strong primary deposits and critical slagging situations. The smaller the dust particles, ceteris paribus, the lower the slagging rate. Unlike coarser pulverized coal, the strength of deposits increases due to sintering and decreases due to sulphatization. © 2016 Springer Science+Business Media New York


Alekhnovich A.N.,JSC Ural Heat Engineering Laboratory
Power Technology and Engineering | Year: 2014

The initial slagging temperature represents a combination of various properties of fly ash, does not give a priori preference to any of them, and objectively characterizes the bonding of particles in deposits. Unlike other countries, in our country, this temperature is widely used as a main coal slagging index. This temperature measured in different experimental conditions for the same coal may differ from the temperature measured in identical conditions for different coals. The first part of this review addresses methods for determining the initial slagging temperature and the use of this index during the design and operation of coal-fired boilers. © 2014, Springer Science+Business Media New York.


Alekhnovich A.N.,JSC Ural Heat Engineering Laboratory
Power Technology and Engineering | Year: 2015

Furnace chambers are currently designed with extensive use of methods employing computer programs for three-dimensional dynamics that take into account a large number of influencing factors in the form of physically based quantities without the computational model being dependent on features of the geometry and operating mode of the furnace. The results of heat transfer calculations, however, are highly dependent on a priori specification of the level of loose (not sintered) deposits and slagging of the furnace. This has made it necessary to develop and test models of slagging and empirical methods for predicting the thermal resistance of deposits based on extensive studies in Russia. For practical purposes it is also necessary to improve zonal methods using physical principles for heat transfer calculations. © 2015, Springer Science+Business Media New York.


Alekhnovich A.N.,JSC Ural Heat Engineering Laboratory | Bogomolov V.V.,JSC Ural Power Engineering Company
Power Technology and Engineering | Year: 2010

The combustion of coal mixtures is regarded both as a necessary step and as a technology which offers noticeable technical, economic, and ecological advantages. The choice of an optimal, or even acceptable, mixture requires knowledge of the characteristics and properties of the coals being blended and of how their behavior changes in a mixture. With mixing, all the indicators characterizing a coal undergo changes and an improvement in one may be accompanied by the deterioration of others. Based on experimental and published data, we have analyzed the major characteristics of mixtures that control the operation of coal-dust thermal power plants, first the ones which are not additive, and then those whose additivity is not evident without experimental study. © 2010 Springer Science+Business Media, Inc.


Bogomolov V.V.,JSC Ural Power Engineering Company | Alekhnovich A.N.,JSC Ural Heat Engineering Laboratory | Kuznetzov A.Yu.,JSC Ural Power Engineering Company | Bogomolov O.V.,JSC Ural Power Engineering Company
Power Technology and Engineering | Year: 2012

An instrumented study of furnace process in BKZ-160 boilers at the Sogrinskaya heating and electric power plant is used to examine boiler slagging and capacity limitations. The causes of slagging are established: burning of low-ash coals, excessively fine coal dust, high air inflow into the furnace and gas ducts with corresponding low excess air in the burner feeds, nonoptimal flue gas dynamics owing to a nonuniform distribution of secondary air between the burners, etc. These results confirm that, with other conditions the same, tangentially-fired furnaces are subject to more slagging, often at emergency levels, than the other standard combustion configurations. © 2012 Springer Science+Business Media, Inc.

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