Contents
HEAT-AND-POWER ENGINEERING FUNDAMENTALS
SOME THEORETICAL PROBLEMS IN CHEMICAL ENGINEERING
Chr. Bojadjiev
chboyadj@bas.bg
Bulgarian Academy of Sciences, Institute of Chemical Engineering
Keywords: column modeling, diffusion model, velocity nonuniformity, scale-up, scale effect, average concentration models, parameter identification.
The chemical engineering is a branch of the chemical science with object of investigations the physical chemistry processes in the industrial apparatuses in the chemical plants. It use modeling and simulation as fundamental methods for investigation of the chemical engineering processes on the bases of the fundamental achievements of the chemistry, physics and mathematics. The main purpose of these investigations is quantitative description of the mechanism and kinetics of the industrial apparatuses for its optimal design, control or renovation.
OPTIMIZATION OF THE DISCRETE ROUGNESS GEOMETRY ON EXCHANGER PLATES
Yu.A. Kirsanov, B.Sh. Galikov
kirsanov-yury@mail.ru
The Research Center of Problems of Power Engineering of Kazan Science Center of the Russian Academy of Sciences, Kazan
Keywords: Теплообменник, пластина, дискретная шероховатость, componentry, optimization.
Abstract
The device of the plate heat exchanger and real heat exchange surfaces are considered. Some alternatives of surfaces with the discrete roughness capable to raise heat transfer or shorten sizes of the plate heat exchanger are offered. The technique and results of optimization of relative sizes of roughness elements are presented. The choice of variants of configuration on a surface of plates of elements of a discrete roughness in the form of the spherical segments possessing the greatest area of a heat exchange surface is made.
INDUSTRIAL HEAT-AND-POWER ENGINEERING
ENERGY PERFORMANCE EVALUATION OF HEAT-TECHNOLOGICAL SCHEME OF GASIFICATION IN FLUIDIZED BED WITH THE SUBSEQUENT AFTERBURNING OF FUEL
D.V.Yermolaev, G.R. Mingaleeva
denis-yermolaev@mail.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords : Coal, gasification, fluidized bed, heat, exergy, power gas.
Abstract
In work the estimation of calorific and power performance of heat-technological scheme of gasification in fluidized bed with the subsequent afterburning of fuel with use of thermo and thermodynamic analyses on the basis of definition of entering and leaving flow of energy for each member of the scheme is resulted. Values of thermodynamic coefficient of efficiency of the scheme are compounded by 56 %, that essentially above, than for traditional systems with opening-up and coal burning in powdered state.
ENERGOECONOMY AT CARRYING OUT OF PROCESSES OF DIVISION AND CLEARINGS OF SUBSTANCES
Farahov M.I., Laptev A.G.
laptev@mail.ru
Kazan State Power Engineering University
Keywords: rectification, absorption, clearing of gases
Abstract
In a review the basic approaches and examples are considered at carrying out of processes warmly – and массообмена (rectification, absorption, etc.) and clearings of gases in plants. Designs of new contact devices and examples of modernisation of the installations, introduced in the industry are presented.
POWER GENERATION STATIONS
INFLUENCE OF SCALE AND TECHNOLOGICAL FACTORS ON EXERGETIC PARAMETERS OF SYSTEMS OF PREPARATION OF COAL
G.R. Mingaleeva
mingaleeva-gr@mail.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords: dust-concentrator, system of preparation of fuel, pulverized coal, exergic efficiency
Abstract
Dependences exergetic efficiency of systems of preparation of coal from scale and technological parameters of drying-mill installation are considered by the example of use hammer mills in individual systems with the intermediate bunker of a ready dust. It is shown, that exergetic the efficiency of system, depends from drying and milling productivity of mills. And less damp coal is more preferable to grind in drying-mill installations of smaller productivity, and coal with high humidity – in more powerful.
RESEARCH OF THERMAL DEAERATOR’S BLOWOFF STEAM
Sharapov V.I., Pazushkina O.V.
sharapov@ulstu.ru
Keywords: thermal deaerator’s blowoff, deaeration of water, corrosion-active gases
Abstract
The problem of definition of size of minimally necessary quantity thermal deaerator’s blowoff steam is solved. The complex of researches and the technological development is executed allowing essentially to increase reliability and profitability thermal deaeration of water in heat power installations due to effective removal blowoff steam, decrease of quantity and recycling of heat and weights formed at deaeration mixes blowoff steam and not condensed corrosion-active gases.
POWER AND MECHANICAL ENGINEERING
COMPARATIVE ANALYSIS OF ESTIMATION METHODS FOR AMPLITUDE COEFFICIENTS IN CREEP CONDITIONS
N.V.Boychenko*, O.V. Kleidman**
tasha1203@mail.ru
*Research Center for Power Engineering Problems of the Russian Academy of Sciences
** Kazan State Power Engineering University
Keywords: Biaxial loading, higher-order terms, crack-tip field, plane strain, creeping materials.
Abstract
Three methods of amplitude coefficient determination for the higher-order crack-tip fields were elaborated and realized in a power-law creeping material under biaxial loading. First method is based on two-term expansion. Two else methods are based on three-term asymptotic crack-tip fields.
The amplitude coefficients distributions for three types of biaxial stress states, creep time and crack distance are displayed. Comparative analysis of estimation methods for amplitude coefficients in creep conditions was done.