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1
Content available remote Thermal insulation materials with porous structure
Koshlak H.
Journal of New Technologies in Environmental Science
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2018
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Vol. 2, nr 4
187--196
EN
The raw mix of silica-containing technogenic component - fly ash of thermal power plants - and the methods of preparing waterproof porous thermal insulating materials of extended application on its base according to the powder low-temperature technology has been developed using multifunctional properties of soluble glass as: a) a binding component; b) blowing agent; c) the raw mix hardening rate regulator. The physical and chemical, technological aspects of obtaining and using the suggested alkaline-silicate compositions have been considered.
2
Content available remote The thermophysical peculiarities heat and mass transfer inoculators in melts metals
Koshlak H.
Journal of New Technologies in Environmental Science
|
2018
|
Vol. 2, nr 4
183--186
EN
The article presents the results of research of thermophysical peculiarities obtaining volumetric amorphous structures in metals and alloys. This technology differs mainly the realization internal heat removal by means of local heat sink (inoculator). A mathematical model of melting inoculator in melts for optimizing the process of obtaining massive amorphous structures, which allows to reduce time of experimental research and material resources to create massive amorphous structures. Mathematical modeling of processes heat and mass transfer inoculator in melts allows you to identify peculiarities of the technological process, and establish influence inoculator on the degree of amorphization melt. The results provide an effective assessment of the intensity of heat transfer during the casting process, which makes it possible to estimate and predict the ability of alloys to the amorphization of the structure.
3
Content available Calculation of heat transfer in fluid around gas-vapour bubbles
Pavlenko A., Koshlak H.
Structure and Environment
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2017
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Vol. 9, no. 1
59--62
EN
In this paper the mathematical model for calculating heat transfer in the fluid that surrounds the oscillating gas – steam bubble. The mathematical model takes into account the changing thermal and physical characteristics the liquid, changing the size of bubbles, heat exchange processes at its border.
4
Content available remote Use of Burshtyn TPP ash for the production of expanded gas concrete
Koshlak H.
Journal of New Technologies in Environmental Science
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2017
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Vol. 1, nr 1
19--25
EN
The impact of thermal power plants on the environment depends largely on the type of fuel. Coal is most polluted of all energy sources and making the largest contribution to global climate change. In coal power plants account for the biggest share of greenhouse gas emissions in the energy sector, as they have the highest rate of release of carbon dioxide per unit of electricity produced compared with all other fossil fuels. When burning coal into the atmosphere large quantities of solid particles containing not burned carbon oxides and heavy metals emitted as carbon monoxide (CO) and toxic organic compounds, including dioxins and benzopyrene, have carcinogenic effect, fly ash, sulfur and sulfuric anhydride, nitrogen oxides, some amount of fluoride and gaseous products of incomplete combustion. So especially harmful condensation power plants working on low-grade fuels. Among these stations applies Burshtyn TPP. The aim of this work is to study the technology of production of expanded concrete possibility of replacing cement ash Burshtyn thermal power station, strength of the samples and kinetics of hardening.
5
Content available remote Use of Burshtyn TPP ash for the production of expanded gas concrete
Koshlak H.
Journal of New Technologies in Environmental Science
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2017
|
Vol. 1, nr 3
94--100
EN
The impact of thermal power plants on the environment depends largely on the type of fuel. Coal is most polluted of all energy sources and making the largest contribution to global climate change. In coal power plants account for the biggest share of greenhouse gas emissions in the energy sector, as they have the highest rate of release of carbon dioxide per unit of electricity produced compared with all other fossil fuels. When burning coal into the atmosphere large quantities of solid particles containing not burned carbon oxides and heavy metals emitted as carbon monoxide (CO) and toxic organic compounds, including dioxins and benzopyrene, have carcinogenic effect, fly ash, sulfur and sulfuric anhydride, nitrogen oxides, some amount of fluoride and gaseous products of incomplete combustion. So especially harmful condensation power plants working on low-grade fuels. Among these stations applies Burshtyn TPP. Solid waste production BTPP is the main fuel slag and ash. Laboratory studies show that in 2015 was formed 526,335 tons of ash and 125,583 tons of slag, which in large near BTPP form parts of ash dumps. Most European TPP do not form ash dumps because their rational use, given the content of the ash, useful for technologies manufacturing of building material chemical elements.
6
Content available remote The rate of formation pores in the material which swells
Koshlak H.
Journal of New Technologies in Environmental Science
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2017
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Vol. 1, nr 1
26--30
EN
The most common use of porous materials in technical power engineering is thermal insulation. And most interesting to consider as an example of macroporous materials are materials obtained by the swelling mass of raw material, as the knowledge of the processes heat and mass transfer allows them to adjust their final thermophysical characteristics. These materials include polystyrene foam materials gas concrete, some highly refractory materials, foam glass, expanded clay, etc. A detailed review of the technology of preparation of any of these materials can be concluded that there is a relationship between the thermophysical properties the porous material and it’s of swelling modes.
7
Content available remote Research of influence of the perforation form in metal products on their thermal conductivity
Pavlenko A., Koshlak H., Cheylitko A.
Journal of New Technologies in Environmental Science
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2017
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Vol. 1, nr 3
108--112
EN
The porosity in metals has been perceived only as a negative factor for a long time, which reduces the mechanical properties and tightness of the material. For preventing and blocking the negative effects of porosity in metals were dedicated a lot of scientific works, some of them are used in present time [1-3]. However, due to numerous experiments the positive factors of porosity in metals were opened. These factors are the combination of physical and mechanical properties such as high stiffness in combination with a very low density (low specific gravity) and/or high gas permeability combined with a high/low thermal conductivity [4]. Thanks to this, porous metals have received a new stage of evolution. Now porosity is being regarded not only as a negative effect of imperfection technology of making metal products, but also as a way to produce a material with unique properties. Globally porous metal materials can be divided into three categories: cellular metals [5]; metallic foams [6] and porous metals [7]. Products from such materials are used in the automotive industry as structural elements; in the aerospace industry as titanium and aluminum sandwich panels; in shipbuilding as a body for passenger vessels; in medicine as implants in humans [8-11]. From the field of use such products must conform to the following parameters: porosity, gas permeability, thermal conductivity, electrical conductivity, density, sound absorption, etc. There are a lot of methods of creation of porous metallic materials today. But complete method of controlling thermal properties of materials by changing parameters of porosity is still no. For creating such method we need to know what factors, under what conditions and with what degree are influence on the required material's parameters. The aim of this work is to investigate the influence of a combination of factors (form, size and position of pores) in the porous metal material on the thermal conductivity.
8
Content available remote Dimensions of the nucleus agent pore former closed spherical pores
Pavlenko A., Cheylitko A., Koshlak H., Piotrowski J. Z.
Journal of New Technologies in Environmental Science
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2017
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Vol. 1, nr 3
101--107
EN
Many experimental data indicate a relationship between the porosity of the material and its thermophysical properties [1-3]. Influence of porosity on the thermal conductivity of the material can be considered following the example of experimental data [2]. The values of thermal conductivity coefficient of iron (58.19 W/(m∙K)) and a rock formation (3.26 W/(m∙K)) differ by almost 18 times, but the filling of iron balls and balls rock formation of the same a porosity of 62.5% has nearly the same coefficient of thermal conductivity (0.0403 W/(m∙K) and 0.0402 W/(m∙K) respectively). However, the way of forming the porous structure has not yet been investigated, and a clear relationship between the porosity and the physical properties of the material not found.
9
Content available Prospects for the development of hydrate storage and transportation technology of methane gas
Pavlenko A., Koshlak H., Vytyaz O., Rybicki Cz.
AGH Drilling, Oil, Gas
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2015
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Vol. 32, no. 1
13--21
EN
The gas hydrate tecłmologies can be alternative to the traditional methods of the rational use of hydrocarbon gases. However the known constructions of apparatuses for the production of gas hydrates cannot satisfy the condition of their industrial use fully. Authors offer to carry out the high-quality contact of gas and water at formation of gas hydrate by jet apparatuses with a free falling jet. On their basis a technological chart is offered for realization of continuous cycle of production of gas hydrate. The aim is to develop technical solutions and process parameters of continuous production of gas hydrates, which would satisfy the requirements of industrial application
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