Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics

IntroductionLarge industrial factories often discharge significant quantities of low-pressure steam (dead steam) into the atmosphere, which causes energy losses. Retaining low-pressure steam content reduces boiler load, resulting in energy savings and lower costs for the fuel consumption (for exampl...

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Autores principales:	A Rezvanivand fanaei, A Hasanpour, A. M Nikbakht
Formato:	article
Lenguaje:	EN FA
Publicado:	Ferdowsi University of Mashhad 2020
Materias:	thermo-compressor computational fluid dynamics control volume method consumption energy Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/3381e76b32774de887f9273cf883cf1a
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id	oai:doaj.org-article:3381e76b32774de887f9273cf883cf1a
record_format	dspace
institution	DOAJ
collection	DOAJ
language	EN FA
topic	thermo-compressor computational fluid dynamics control volume method consumption energy Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	thermo-compressor computational fluid dynamics control volume method consumption energy Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040 A Rezvanivand fanaei A Hasanpour A. M Nikbakht Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
description	IntroductionLarge industrial factories often discharge significant quantities of low-pressure steam (dead steam) into the atmosphere, which causes energy losses. Retaining low-pressure steam content reduces boiler load, resulting in energy savings and lower costs for the fuel consumption (for example, gas consumption bill in a factory). The boosted-pressure steam is used in processes such as distillation, hot water production, space heating or vacuum generation. If the vapor pressure for the intended application is low, a thermo-compressor is able to increase the pressure and temperature to the required level. Thermo-compressors are a special type of gas compressor that uses an actuator to compress secondary fluid and does not have any blades or moving parts. The accurate prediction of the thermo-compressor performance improves the reliability of this process and increases its efficiency.Materials and MethodsTwo important characteristics for the current thermo-compressors are entrainment ratio (ER) and compression ratio (CR). The first is the dimensionless mass flow rate, and the second is the dimensionless pressure. The wet steam theory as a classic theory is used by Wolmer-Frankel-Zeldovich to calculate the amount of liquid particles. In order to select the best geometry for the thermo-compressor among all possible geometries, the performance of each model must be compared with other models. In following, the case that includes characteristic parameters associated with the target values has been selected.The commercial Ansys Fluent Versions 15, based on the finite volume method (FVM) was used to simulate and monitoring the flow behavior inside the thermo-compressor. The governing partial differential equations (PDE) were solved implicitly using a density-based solution. The convective heat transfer terms were discriminated based on the second-order upwind scheme. The non-linear governing equations were solved using the implicit coupling solver and the standard wall function was used near the wall. Given the three-dimensional flow for steam, the equations of mass conservation, momentum, and energy were written. The Realizable model was used to simulate turbulences in the flow.Results and DiscussionA summary of the results is presented in terms of the results of pressure, velocity magnitude, Mach number and temperature. A general understanding of this characteristic for a thermo-compressor is extremely important for recognizing the fluid flow inside it, and it is very useful for practical use. Pressure is the most important factor in the recharge section of a thermo-compressor. Increasing the recharge vapor pressure in a thermos-compressor revival the dead steam and increases the steam efficiency. The revival steam can be used in other parts because of their high thermal content. Another important factor in the study of flow behavior inside the thermocouple is velocity magnitude. This quantity, which is closely related to the concept of momentum inside the thermocouple, had high influences from high pressure inputs as well as the thermo-compressor geometry. The highest amount of velocity occurs after the initial nozzle and had a very high magnitude (1000 ms-1), which was also remarkably high in Monnet's terms. Another important characteristic of a flow is the temperature of the stream. The high input temperature associated with motive vapor at the outlet of the primary nozzle was sharply reduced, even in some section reached to 110 °Kelvin. Due to the very high flow momentum in this section, the fluid phase remained gas and it can be justified from the point of view of the fluid dynamics.ConclusionsConsidering the importance of thermodynamic properties of steam in conversion and industries, it would be extremely beneficial to fully understand the interactions inside the thermocouple compressor. The importance of the discussed characteristics is more specific when there is a close relationship between each of these factors and energy consumption in a factory or in any industrial production unit. It was observed that the designed thermos-compressor was able to increase the velocity and temperature in a desirable range for the conversion of non-consumable vapor to the pressure and temperature. It was concluded that the Realizable model due to the prediction of the jet characteristics appearing in the flow regimes for axial symmetry had a high ability to simulate fluid flows inside the thermos-compressor.
format	article
author	A Rezvanivand fanaei A Hasanpour A. M Nikbakht
author_facet	A Rezvanivand fanaei A Hasanpour A. M Nikbakht
author_sort	A Rezvanivand fanaei
title	Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
title_short	Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
title_full	Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
title_fullStr	Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
title_full_unstemmed	Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics
title_sort	study of the vapor thermo-compressor to reduce energy consumption in the sugar production line using computational fluid dynamics
publisher	Ferdowsi University of Mashhad
publishDate	2020
url	https://doaj.org/article/3381e76b32774de887f9273cf883cf1a
work_keys_str_mv	AT arezvanivandfanaei studyofthevaporthermocompressortoreduceenergyconsumptioninthesugarproductionlineusingcomputationalfluiddynamics AT ahasanpour studyofthevaporthermocompressortoreduceenergyconsumptioninthesugarproductionlineusingcomputationalfluiddynamics AT amnikbakht studyofthevaporthermocompressortoreduceenergyconsumptioninthesugarproductionlineusingcomputationalfluiddynamics
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spelling	oai:doaj.org-article:3381e76b32774de887f9273cf883cf1a2021-11-14T06:35:26ZStudy of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics2228-68292423-394310.22067/jam.v10i2.76872https://doaj.org/article/3381e76b32774de887f9273cf883cf1a2020-09-01T00:00:00Zhttps://jame.um.ac.ir/article_34297_906c24bd6e116da738355520f10c341c.pdfhttps://doaj.org/toc/2228-6829https://doaj.org/toc/2423-3943IntroductionLarge industrial factories often discharge significant quantities of low-pressure steam (dead steam) into the atmosphere, which causes energy losses. Retaining low-pressure steam content reduces boiler load, resulting in energy savings and lower costs for the fuel consumption (for example, gas consumption bill in a factory). The boosted-pressure steam is used in processes such as distillation, hot water production, space heating or vacuum generation. If the vapor pressure for the intended application is low, a thermo-compressor is able to increase the pressure and temperature to the required level. Thermo-compressors are a special type of gas compressor that uses an actuator to compress secondary fluid and does not have any blades or moving parts. The accurate prediction of the thermo-compressor performance improves the reliability of this process and increases its efficiency.Materials and MethodsTwo important characteristics for the current thermo-compressors are entrainment ratio (ER) and compression ratio (CR). The first is the dimensionless mass flow rate, and the second is the dimensionless pressure. The wet steam theory as a classic theory is used by Wolmer-Frankel-Zeldovich to calculate the amount of liquid particles. In order to select the best geometry for the thermo-compressor among all possible geometries, the performance of each model must be compared with other models. In following, the case that includes characteristic parameters associated with the target values has been selected.The commercial Ansys Fluent Versions 15, based on the finite volume method (FVM) was used to simulate and monitoring the flow behavior inside the thermo-compressor. The governing partial differential equations (PDE) were solved implicitly using a density-based solution. The convective heat transfer terms were discriminated based on the second-order upwind scheme. The non-linear governing equations were solved using the implicit coupling solver and the standard wall function was used near the wall. Given the three-dimensional flow for steam, the equations of mass conservation, momentum, and energy were written. The Realizable model was used to simulate turbulences in the flow.Results and DiscussionA summary of the results is presented in terms of the results of pressure, velocity magnitude, Mach number and temperature. A general understanding of this characteristic for a thermo-compressor is extremely important for recognizing the fluid flow inside it, and it is very useful for practical use. Pressure is the most important factor in the recharge section of a thermo-compressor. Increasing the recharge vapor pressure in a thermos-compressor revival the dead steam and increases the steam efficiency. The revival steam can be used in other parts because of their high thermal content. Another important factor in the study of flow behavior inside the thermocouple is velocity magnitude. This quantity, which is closely related to the concept of momentum inside the thermocouple, had high influences from high pressure inputs as well as the thermo-compressor geometry. The highest amount of velocity occurs after the initial nozzle and had a very high magnitude (1000 ms-1), which was also remarkably high in Monnet's terms. Another important characteristic of a flow is the temperature of the stream. The high input temperature associated with motive vapor at the outlet of the primary nozzle was sharply reduced, even in some section reached to 110 °Kelvin. Due to the very high flow momentum in this section, the fluid phase remained gas and it can be justified from the point of view of the fluid dynamics.ConclusionsConsidering the importance of thermodynamic properties of steam in conversion and industries, it would be extremely beneficial to fully understand the interactions inside the thermocouple compressor. The importance of the discussed characteristics is more specific when there is a close relationship between each of these factors and energy consumption in a factory or in any industrial production unit. It was observed that the designed thermos-compressor was able to increase the velocity and temperature in a desirable range for the conversion of non-consumable vapor to the pressure and temperature. It was concluded that the Realizable model due to the prediction of the jet characteristics appearing in the flow regimes for axial symmetry had a high ability to simulate fluid flows inside the thermos-compressor.A Rezvanivand fanaeiA HasanpourA. M NikbakhtFerdowsi University of Mashhadarticlethermo-compressorcomputational fluid dynamicscontrol volume methodconsumption energyAgriculture (General)S1-972Engineering (General). Civil engineering (General)TA1-2040ENFAJournal of Agricultural Machinery, Vol 10, Iss 2, Pp 241-253 (2020)

Study of The Vapor Thermo-Compressor to Reduce Energy Consumption in the Sugar Production Line using Computational Fluid Dynamics

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