Bohuslav Kilkovský - Academia.edu (original) (raw)
Papers by Bohuslav Kilkovský
Applied Thermal Engineering, 2016
Combustion and radiant chambers with inbuilt heat transfer surfaces are integral parts of a wide ... more Combustion and radiant chambers with inbuilt heat transfer surfaces are integral parts of a wide range of process and power equipment such as fired heaters, power boilers, or incinerator furnaces. Operating problems that many of these combustion chambers suffer from are typically due to the design procedures using data of insufficient accuracy regarding the calculated local heat transfer data in individual parts of the chambers equipped with modern low-NO x burners. These problems, obviously, force the designers to devise more accurate design procedures for the respective equipment. The paper therefore discusses the main results obtained so far in the course of a several years long research effort and presents a basic outline of an up-to-date, novel approach to proper design of combustion and radiant chambers with inbuilt heat transfer surfaces. The three most important andconsidering the current design practicealso original components of the presented novel approach which significantly improve the quality of the resulting combustion chamber designs are (i) experimental determination of the actual burner heat flux distribution, (ii) determination of the actual fuel burnout profile of the burner from the obtained heat flux profile using the validated MPF model, and (iii) utilisation of the respective fuel burnout profile in the course of design of the combustion chamber and its inbuilt heat transfer surfaces together with calculation of the local heat flux distribution via the plug-flow-based method, thus replacing the currently used design methods based on the "well stirred" models.
Chemical Engineering Transactions, 2009
preview not available - see full-text PDF article.
Chemical Engineering Transactions, 2015
Laboratory of Energy Intensive Processes placed in the building of NETME Centre, Faculty of Mecha... more Laboratory of Energy Intensive Processes placed in the building of NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology, is a research laboratory focused on increasing efficiency of industrial plants. Current research in the laboratory focuses on improving of the energy efficiency of industrial laundries. That can be achieved for example by recovery of the heat produced in the process. A microturbine is used as a power source. It produces flue gas with temperature approximately 300 °C. This flue gas is currently leaving into ambient air without utilization of its heat. Temperature this high enables utilization of the waste heat for preheating the combustion air or for heating water for various purposes. In this article, an evaluation procedure of several types (both conventional and special) of heat exchangers that are suitable for utilization of flue gas' waste heat and the possibilities of their intensification will be described. It will be shown that...
Chemical Engineering Transactions, 2015
It is imperative that flow distribution is considered while designing heat exchanger tube bundles... more It is imperative that flow distribution is considered while designing heat exchanger tube bundles because it greatly influences equipment performance. What is more, a wide range of operating issues can occur if the distribution is significantly non-uniform. Since pressure gradients which, in fact, govern flow distribution can be adjusted via shape optimisation of individual parts of the flow system, such an action can not only improve performance but also increase reliability of the apparatus. Still, an efficient and accurate-enough flow model has to be available in order for the resulting optimisation model to be viable in terms of engineering practice. Heat exchangers often feature dense tube bundles which cannot be properly described via available simplified 1D models. Utilisation of computational fluid dynamics (CFD) or other computationally-intensive approaches, on the other hand, is not feasible either due to unacceptably long optimisation times. An efficient 2D flow distribut...
Chemical Engineering Transactions, 2016
Heat regenerators transfer heat from one gas to another, with by storage in solids. This type of ... more Heat regenerators transfer heat from one gas to another, with by storage in solids. This type of heat exchanger is used primarily when heat has to be transferred between enormous amounts of gases, when the gases are dirty and liable to plug up the recuperative heat exchangers, or when the gas is too hot or reactive. Regenerative heat exchanger can provide at the same volume much higher heat transfer area and lower friction factor than recuperative heat exchanger. Furthermore, regenerative heat exchanger has in most cases better efficiency and its construction is much simpler. The calculation of this type heat exchanger is relatively complicated. Moreover, a suitable and adequately accurate calculation method is not freely available. Those are the main reasons why the companies are not interested in this type of heat exchanger. On the grounds of requirements from companies we started to deal with design of regenerative heat exchangers and creation of suitable calculation model that w...
New trends in the design of individual pieces of equipment in up-to-date waste-to-energy (WtE) pl... more New trends in the design of individual pieces of equipment in up-to-date waste-to-energy (WtE) plants especially for low or medium capacity are a gradual decrease in spatial requirements (i.e., a move towards higher compactness) and investment and operating costs together with an increase in the overall effectiveness of the plant. This can only be achieved by the reduction in the number of apparatuses and merging functionally different pieces of equipment into singular units, i.e. by employing so-called integrated equipment.Our work is focused on the development of a calculation tool for the design of multifunctional unit coupling function of regenerative heat exchanger and flue gas emission cleaning equipment in one apparatus. This paper presents the results of the first stage of our experimental verification focused on the analysis of the selected type of heat transfer surface from hydraulic characteristics point of view. The results show a good match of the calculated pressure dr...
Energies, 2020
Heat regenerators are simple devices for heat transfer, but their proper design is rather difficu... more Heat regenerators are simple devices for heat transfer, but their proper design is rather difficult. Their design is based on differential equations that need to be solved. This is one of the reasons why these devices are not widely used. There are several methods for solving them that were developed. However, due to the time demands of calculation, these models did not spread too much. With the development of computer technology, the situation changed, and these methods are now relatively easy to apply, as the calculation does not take a lot of time. Another problem arises when selecting a suitable method for calculating the heat transfer coefficient and pressure drop. Their choice depends on the type of packed bed material, and not all available computational equations also provide adequate accuracy. This paper describes the so-called open Willmott methods and provides a basic overview of equations for calculating the regenerative heat exchanger with a fixed bed. Based on the ment...
Frontiers of Chemical Science and Engineering, 2018
RESUMO Objetivo: Descrever as características da demanda e do atendimento de Urgência e Emergênci... more RESUMO Objetivo: Descrever as características da demanda e do atendimento de Urgência e Emergência em Otorrinolaringologia em um hospital de ensino, no município de Goiânia-Goiás. Método: Estudo transversal, quantitativo, utilizando questionário com entrevista semiestruturada e ficha de atendimento médico de 518 pacientes adultos, de ambos os sexos. Resultados: O perfil traçado para homens e mulheres não demonstrou diferença significativa entre os sexos. A idade média dos participantes foi 40,2 anos, com escolaridade de ensino médio, cor/raça parda, situação conjugal com companheiro, domiciliados em Goiânia-Go, em zona urbana. A quase totalidade referiu ter procurado assistência anterior, em unidades básicas de saúde, de onde foram encaminhados. As hipóteses diagnósticas mais frequentes estavam relacionadas à otologia. A conduta médica mais adotada foi tratamento medicamentoso. Após análise, pode-se concluir que o estudo atendeu ao objetivo traçado, caracterizando o atendimento e a demanda do CEROTO/HC/UFG.
The resistance to flow through the various "piping" components, such as fittings, valve... more The resistance to flow through the various "piping" components, such as fittings, valves and connections significantly contributes to pressure drop of a whole piping system. Moreover, some of fittings, like elbows, are frequently used also as important part of heat transfer equipment and significantly influences its thermal-hydraulic characteristics. Heat exchangers designed as tube bundles for boilers, fired heaters, heat recovery steam generators (HRSG) or waste-to energy incinerators prefers the 90 degrees and/or 180 degrees elbows for connection of individual straight circular tubes in the tube bundle. When such heat exchanger would be designed for minimum pressure drop of heated liquid or gas fluid, the accuracy of pressure drop calculation of the elbow plays very important role. Elbow as a bend or curve in a pipe always induces a larger energy loss than a straight pipe of equivalent arc length. Paper presents comparison of the most frequently cited calculation method...
Computer aided design of products or their components is an essential part of industrial practice... more Computer aided design of products or their components is an essential part of industrial practice. The same applies to the field of thermal-hydraulic design of process and power apparatuses for heat exchange. There are several world-renowned software systems for both analyses of existing heat exchangers and for design of new equipment. The most-used ones are those developed by Heat Transfer Research, Inc. (HTRI® Xchanger Suite®), Aspen Technology, Inc. (Aspen Shell & Tube Exchanger) and Chemstations, Inc. (Chemstations™ CHEMCAD™). Educational editions of these packages are available at both mutually cooperating universities – Brno University of Technology (Czech Republic) and Augsburg University of Applied Sciences (Germany). Advantages of these sophisticated software systems are unquestionable particularly in the field of conventional heat exchanger solutions. This paper aims to summarize, compare and discuss features of the above-mentioned software packages via a specific industri...
Applied Thermal Engineering, 2014
ABSTRACT Abstract Computer aided design of heat transfer equipment, i.e., thermal-hydraulic desig... more ABSTRACT Abstract Computer aided design of heat transfer equipment, i.e., thermal-hydraulic design of process and power apparatuses for heat exchange, is an essential part of industrial practice. There are several world-renowned software tools of which the most-used ones are those developed by Heat Transfer Research, Inc. (HTRI® Xchanger Suite®), Aspen Technology, Inc. (Aspen Exchanger Design & Rating), and Chemstations, Inc. (CHEMCAD™). Advantages of these sophisticated software systems are unquestionable particularly in the field of conventional heat exchanger solutions. This paper, however, aims to compare and discuss features of the above-mentioned packages in case of unconventional equipment via a specific industrial problem in which components having common geometries could not be used. For this purpose, thermal-hydraulic analyses of an unconventional steam condenser is performed using educational versions of the three packages with operating parameters at the inlet of the apparatus, thermo-physical properties of streams, and geometry of the apparatus being taken from the operator of the condenser. Based on comparison of the obtained results and condenser operating data it can be seen that although some of the available software tools offer relatively large sets of functionalities, there still is opportunity for development of flexible tools – especially those capable of evaluating non-standard geometries.
Applied Thermal Engineering, 2014
This paper presents and discusses various aspects of fouling in case of heavily polluted flue gas... more This paper presents and discusses various aspects of fouling in case of heavily polluted flue gas (and/or off-gas) coming especially from incinerators/waste-to-energy systems. A long-term experience and know-how from this area as well as continuing research and development brings new insights into manufacturing of equipment and their operating. Polluted off-gas causes high propensity to fouling and necessity of consequent cleaning. In some cases, it is not possible to utilize a conventional approach. Introductory part of the paper provides a description of various types of units for thermal processing of wastes (including sludge and contaminated biomass). Fouling is classified according to various cases of industrial applications connected with easy/difficult cleaning. It is shown how fouling can influence geometry of heat exchangers and their selection. In the following part, several industrial cases are shown taking into account aspects like: • solid particles (ash and flying ash) in the gas, and adapting design according to their concentration; • species contained in flue gas which can chemically react and create fouling deposits on heat transfer surfaces; • potential corrosion between the fouling layer and heat transfer surface caused by local temperature decrease. The above aspects are clearly illustrated through industrial applications as follows: • heat recovery system of unit for the thermal treatment of sludge coming from pulp and paper production; • boiler systems in incineration plants and chemical industry plants. There are various methods to reduce fouling. We have utilized very efficient approach combining intuitive design and sophisticated tools based on CFD (Computational Fluid Dynamics). However, fouling cannot be eliminated completely therefore various efficient methods (mostly tailor-made ones) are utilized (like common mechanical cleaning, air guns, controlled local explosion) for cleaning of surfaces. There is also an effort to develop a mathematical model for fouling prediction, and selection of the most economically acceptable systems connected with current research and development in the field. However, it is difficult to validate the models. Fouling in the field described in the paper is in fact a "never ending story".
Heat Transfer Engineering, 2010
ABSTRACT Fouling of heat exchangers' heat transfer areas is one of the serious problems o... more ABSTRACT Fouling of heat exchangers' heat transfer areas is one of the serious problems of certain process plants. A waste incinerating plant is a typical example of such a process plant. The main process stream in a waste incinerating plant (i.e., produced stream of flue gas) and its thermophysical characteristics and properties significantly influence operating, maintenance, and investment costs of installed equipment and its service life. Moreover, properties of flue gas can vary over a wide range. This contribution deals with the issue of the fouling mechanism at the heat transfer area of tubular heat transfer equipment installed in plants for thermal processing of wastes and presents a mathematical model developed for fouling tendency prediction and for prevention in design and operating of tubular heat transfer equipment designed for applications in waste incinerating plants. Obtained results were compared with experimental data published in worldwide available literature and a very good agreement was found.
Applied Thermal Engineering, 2014
h i g h l i g h t s Heat recovery system in up-to-date waste and biomass to energy technologies. ... more h i g h l i g h t s Heat recovery system in up-to-date waste and biomass to energy technologies. Integrated approach and simulations of the system. Heat exchangers for high temperature applications as key equipment in the process. Conventional types versus tailor-made solutions of heat exchangers. Operational problems, fouling and sophisticated approach in troubleshooting.
The paper presents issues of thermal and static structural analysis of a special heat exchanger w... more The paper presents issues of thermal and static structural analysis of a special heat exchanger with U-tubes. This heat exchanger serves for preheating of process waste gas (PWG) by flue gas. Operating of this preheater is connected with unexpected difficulties (tubes plucking from a tube sheet). Therefore; the significant part of paper discusses damage causes of heat exchanger tubes and their calculation possibilities. Substantial part of paper is also devoted to discussion of used computational models, boundary conditions and results of applied thermal and structural analyses.
Applied Thermal Engineering, 2016
Combustion and radiant chambers with inbuilt heat transfer surfaces are integral parts of a wide ... more Combustion and radiant chambers with inbuilt heat transfer surfaces are integral parts of a wide range of process and power equipment such as fired heaters, power boilers, or incinerator furnaces. Operating problems that many of these combustion chambers suffer from are typically due to the design procedures using data of insufficient accuracy regarding the calculated local heat transfer data in individual parts of the chambers equipped with modern low-NO x burners. These problems, obviously, force the designers to devise more accurate design procedures for the respective equipment. The paper therefore discusses the main results obtained so far in the course of a several years long research effort and presents a basic outline of an up-to-date, novel approach to proper design of combustion and radiant chambers with inbuilt heat transfer surfaces. The three most important andconsidering the current design practicealso original components of the presented novel approach which significantly improve the quality of the resulting combustion chamber designs are (i) experimental determination of the actual burner heat flux distribution, (ii) determination of the actual fuel burnout profile of the burner from the obtained heat flux profile using the validated MPF model, and (iii) utilisation of the respective fuel burnout profile in the course of design of the combustion chamber and its inbuilt heat transfer surfaces together with calculation of the local heat flux distribution via the plug-flow-based method, thus replacing the currently used design methods based on the "well stirred" models.
Chemical Engineering Transactions, 2009
preview not available - see full-text PDF article.
Chemical Engineering Transactions, 2015
Laboratory of Energy Intensive Processes placed in the building of NETME Centre, Faculty of Mecha... more Laboratory of Energy Intensive Processes placed in the building of NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology, is a research laboratory focused on increasing efficiency of industrial plants. Current research in the laboratory focuses on improving of the energy efficiency of industrial laundries. That can be achieved for example by recovery of the heat produced in the process. A microturbine is used as a power source. It produces flue gas with temperature approximately 300 °C. This flue gas is currently leaving into ambient air without utilization of its heat. Temperature this high enables utilization of the waste heat for preheating the combustion air or for heating water for various purposes. In this article, an evaluation procedure of several types (both conventional and special) of heat exchangers that are suitable for utilization of flue gas' waste heat and the possibilities of their intensification will be described. It will be shown that...
Chemical Engineering Transactions, 2015
It is imperative that flow distribution is considered while designing heat exchanger tube bundles... more It is imperative that flow distribution is considered while designing heat exchanger tube bundles because it greatly influences equipment performance. What is more, a wide range of operating issues can occur if the distribution is significantly non-uniform. Since pressure gradients which, in fact, govern flow distribution can be adjusted via shape optimisation of individual parts of the flow system, such an action can not only improve performance but also increase reliability of the apparatus. Still, an efficient and accurate-enough flow model has to be available in order for the resulting optimisation model to be viable in terms of engineering practice. Heat exchangers often feature dense tube bundles which cannot be properly described via available simplified 1D models. Utilisation of computational fluid dynamics (CFD) or other computationally-intensive approaches, on the other hand, is not feasible either due to unacceptably long optimisation times. An efficient 2D flow distribut...
Chemical Engineering Transactions, 2016
Heat regenerators transfer heat from one gas to another, with by storage in solids. This type of ... more Heat regenerators transfer heat from one gas to another, with by storage in solids. This type of heat exchanger is used primarily when heat has to be transferred between enormous amounts of gases, when the gases are dirty and liable to plug up the recuperative heat exchangers, or when the gas is too hot or reactive. Regenerative heat exchanger can provide at the same volume much higher heat transfer area and lower friction factor than recuperative heat exchanger. Furthermore, regenerative heat exchanger has in most cases better efficiency and its construction is much simpler. The calculation of this type heat exchanger is relatively complicated. Moreover, a suitable and adequately accurate calculation method is not freely available. Those are the main reasons why the companies are not interested in this type of heat exchanger. On the grounds of requirements from companies we started to deal with design of regenerative heat exchangers and creation of suitable calculation model that w...
New trends in the design of individual pieces of equipment in up-to-date waste-to-energy (WtE) pl... more New trends in the design of individual pieces of equipment in up-to-date waste-to-energy (WtE) plants especially for low or medium capacity are a gradual decrease in spatial requirements (i.e., a move towards higher compactness) and investment and operating costs together with an increase in the overall effectiveness of the plant. This can only be achieved by the reduction in the number of apparatuses and merging functionally different pieces of equipment into singular units, i.e. by employing so-called integrated equipment.Our work is focused on the development of a calculation tool for the design of multifunctional unit coupling function of regenerative heat exchanger and flue gas emission cleaning equipment in one apparatus. This paper presents the results of the first stage of our experimental verification focused on the analysis of the selected type of heat transfer surface from hydraulic characteristics point of view. The results show a good match of the calculated pressure dr...
Energies, 2020
Heat regenerators are simple devices for heat transfer, but their proper design is rather difficu... more Heat regenerators are simple devices for heat transfer, but their proper design is rather difficult. Their design is based on differential equations that need to be solved. This is one of the reasons why these devices are not widely used. There are several methods for solving them that were developed. However, due to the time demands of calculation, these models did not spread too much. With the development of computer technology, the situation changed, and these methods are now relatively easy to apply, as the calculation does not take a lot of time. Another problem arises when selecting a suitable method for calculating the heat transfer coefficient and pressure drop. Their choice depends on the type of packed bed material, and not all available computational equations also provide adequate accuracy. This paper describes the so-called open Willmott methods and provides a basic overview of equations for calculating the regenerative heat exchanger with a fixed bed. Based on the ment...
Frontiers of Chemical Science and Engineering, 2018
RESUMO Objetivo: Descrever as características da demanda e do atendimento de Urgência e Emergênci... more RESUMO Objetivo: Descrever as características da demanda e do atendimento de Urgência e Emergência em Otorrinolaringologia em um hospital de ensino, no município de Goiânia-Goiás. Método: Estudo transversal, quantitativo, utilizando questionário com entrevista semiestruturada e ficha de atendimento médico de 518 pacientes adultos, de ambos os sexos. Resultados: O perfil traçado para homens e mulheres não demonstrou diferença significativa entre os sexos. A idade média dos participantes foi 40,2 anos, com escolaridade de ensino médio, cor/raça parda, situação conjugal com companheiro, domiciliados em Goiânia-Go, em zona urbana. A quase totalidade referiu ter procurado assistência anterior, em unidades básicas de saúde, de onde foram encaminhados. As hipóteses diagnósticas mais frequentes estavam relacionadas à otologia. A conduta médica mais adotada foi tratamento medicamentoso. Após análise, pode-se concluir que o estudo atendeu ao objetivo traçado, caracterizando o atendimento e a demanda do CEROTO/HC/UFG.
The resistance to flow through the various "piping" components, such as fittings, valve... more The resistance to flow through the various "piping" components, such as fittings, valves and connections significantly contributes to pressure drop of a whole piping system. Moreover, some of fittings, like elbows, are frequently used also as important part of heat transfer equipment and significantly influences its thermal-hydraulic characteristics. Heat exchangers designed as tube bundles for boilers, fired heaters, heat recovery steam generators (HRSG) or waste-to energy incinerators prefers the 90 degrees and/or 180 degrees elbows for connection of individual straight circular tubes in the tube bundle. When such heat exchanger would be designed for minimum pressure drop of heated liquid or gas fluid, the accuracy of pressure drop calculation of the elbow plays very important role. Elbow as a bend or curve in a pipe always induces a larger energy loss than a straight pipe of equivalent arc length. Paper presents comparison of the most frequently cited calculation method...
Computer aided design of products or their components is an essential part of industrial practice... more Computer aided design of products or their components is an essential part of industrial practice. The same applies to the field of thermal-hydraulic design of process and power apparatuses for heat exchange. There are several world-renowned software systems for both analyses of existing heat exchangers and for design of new equipment. The most-used ones are those developed by Heat Transfer Research, Inc. (HTRI® Xchanger Suite®), Aspen Technology, Inc. (Aspen Shell & Tube Exchanger) and Chemstations, Inc. (Chemstations™ CHEMCAD™). Educational editions of these packages are available at both mutually cooperating universities – Brno University of Technology (Czech Republic) and Augsburg University of Applied Sciences (Germany). Advantages of these sophisticated software systems are unquestionable particularly in the field of conventional heat exchanger solutions. This paper aims to summarize, compare and discuss features of the above-mentioned software packages via a specific industri...
Applied Thermal Engineering, 2014
ABSTRACT Abstract Computer aided design of heat transfer equipment, i.e., thermal-hydraulic desig... more ABSTRACT Abstract Computer aided design of heat transfer equipment, i.e., thermal-hydraulic design of process and power apparatuses for heat exchange, is an essential part of industrial practice. There are several world-renowned software tools of which the most-used ones are those developed by Heat Transfer Research, Inc. (HTRI® Xchanger Suite®), Aspen Technology, Inc. (Aspen Exchanger Design & Rating), and Chemstations, Inc. (CHEMCAD™). Advantages of these sophisticated software systems are unquestionable particularly in the field of conventional heat exchanger solutions. This paper, however, aims to compare and discuss features of the above-mentioned packages in case of unconventional equipment via a specific industrial problem in which components having common geometries could not be used. For this purpose, thermal-hydraulic analyses of an unconventional steam condenser is performed using educational versions of the three packages with operating parameters at the inlet of the apparatus, thermo-physical properties of streams, and geometry of the apparatus being taken from the operator of the condenser. Based on comparison of the obtained results and condenser operating data it can be seen that although some of the available software tools offer relatively large sets of functionalities, there still is opportunity for development of flexible tools – especially those capable of evaluating non-standard geometries.
Applied Thermal Engineering, 2014
This paper presents and discusses various aspects of fouling in case of heavily polluted flue gas... more This paper presents and discusses various aspects of fouling in case of heavily polluted flue gas (and/or off-gas) coming especially from incinerators/waste-to-energy systems. A long-term experience and know-how from this area as well as continuing research and development brings new insights into manufacturing of equipment and their operating. Polluted off-gas causes high propensity to fouling and necessity of consequent cleaning. In some cases, it is not possible to utilize a conventional approach. Introductory part of the paper provides a description of various types of units for thermal processing of wastes (including sludge and contaminated biomass). Fouling is classified according to various cases of industrial applications connected with easy/difficult cleaning. It is shown how fouling can influence geometry of heat exchangers and their selection. In the following part, several industrial cases are shown taking into account aspects like: • solid particles (ash and flying ash) in the gas, and adapting design according to their concentration; • species contained in flue gas which can chemically react and create fouling deposits on heat transfer surfaces; • potential corrosion between the fouling layer and heat transfer surface caused by local temperature decrease. The above aspects are clearly illustrated through industrial applications as follows: • heat recovery system of unit for the thermal treatment of sludge coming from pulp and paper production; • boiler systems in incineration plants and chemical industry plants. There are various methods to reduce fouling. We have utilized very efficient approach combining intuitive design and sophisticated tools based on CFD (Computational Fluid Dynamics). However, fouling cannot be eliminated completely therefore various efficient methods (mostly tailor-made ones) are utilized (like common mechanical cleaning, air guns, controlled local explosion) for cleaning of surfaces. There is also an effort to develop a mathematical model for fouling prediction, and selection of the most economically acceptable systems connected with current research and development in the field. However, it is difficult to validate the models. Fouling in the field described in the paper is in fact a "never ending story".
Heat Transfer Engineering, 2010
ABSTRACT Fouling of heat exchangers' heat transfer areas is one of the serious problems o... more ABSTRACT Fouling of heat exchangers' heat transfer areas is one of the serious problems of certain process plants. A waste incinerating plant is a typical example of such a process plant. The main process stream in a waste incinerating plant (i.e., produced stream of flue gas) and its thermophysical characteristics and properties significantly influence operating, maintenance, and investment costs of installed equipment and its service life. Moreover, properties of flue gas can vary over a wide range. This contribution deals with the issue of the fouling mechanism at the heat transfer area of tubular heat transfer equipment installed in plants for thermal processing of wastes and presents a mathematical model developed for fouling tendency prediction and for prevention in design and operating of tubular heat transfer equipment designed for applications in waste incinerating plants. Obtained results were compared with experimental data published in worldwide available literature and a very good agreement was found.
Applied Thermal Engineering, 2014
h i g h l i g h t s Heat recovery system in up-to-date waste and biomass to energy technologies. ... more h i g h l i g h t s Heat recovery system in up-to-date waste and biomass to energy technologies. Integrated approach and simulations of the system. Heat exchangers for high temperature applications as key equipment in the process. Conventional types versus tailor-made solutions of heat exchangers. Operational problems, fouling and sophisticated approach in troubleshooting.
The paper presents issues of thermal and static structural analysis of a special heat exchanger w... more The paper presents issues of thermal and static structural analysis of a special heat exchanger with U-tubes. This heat exchanger serves for preheating of process waste gas (PWG) by flue gas. Operating of this preheater is connected with unexpected difficulties (tubes plucking from a tube sheet). Therefore; the significant part of paper discusses damage causes of heat exchanger tubes and their calculation possibilities. Substantial part of paper is also devoted to discussion of used computational models, boundary conditions and results of applied thermal and structural analyses.