部件高效室对流干燥机分析

Oleksandr Spivak, Natalia Rezydent, Yaroslav Krymnyak
{"title":"部件高效室对流干燥机分析","authors":"Oleksandr Spivak, Natalia Rezydent, Yaroslav Krymnyak","doi":"10.31649/2311-1429-2023-1-101-106","DOIUrl":null,"url":null,"abstract":"A methodology for calculating individual components of the exergy balance and the exergy coefficient of useful action for non-stationary heat and mass transfer processes, in particular drying processes, is proposed. It is shown that the analysis of the drying process by exergetic characteristics is more effective than by thermal characteristics, as it makes it possible to estimate both internal and external losses, as well as the potential of energy flows. Calculations of exergetic and thermal efficiency of the chamber convective dryer were performed on the basis of the proposed methodology. It was established that when the temperature of the incoming heat carrier changes from 5 to 35°С, the exergetic efficiency of the drying unit changes within 4...16%, while the thermal efficiency determined using heat balance equations is about 50%. It is shown that with an increase in the temperature of the surrounding environment, the exergetic efficiency of chamber drying units decreases significantly, and the thermal efficiency changes within 5%, while it increases with an increase in the temperature of the heat carrier at the input, and decreases with an increase in the temperature of the heat carrier at the outlet in such the very limits. Exergy losses in drying plants are due to losses caused by flows of substances that carry exergy out of the system, losses as a result of heat exchange at a finite temperature difference, or mass exchange at a finite concentration difference, as a result of mechanical friction and hydraulic resistance, chemical reactions in non-equilibrium conditions, reduction of the magnetic or electric field under the action of electric resistance, etc. To increase the exergy efficiency of chamber drying units, it is necessary to reduce the exergy losses in the heaters, therefore it is preferable not to use steam heaters, it is worth giving preference to electric heaters or pyrolysis boilers of indirect air heating. It is also necessary to reduce heat loss during mixing of spent and fresh heat carrier, to reduce the temperature of the incoming heat carrier.","PeriodicalId":221366,"journal":{"name":"Modern technology, materials and design in construction","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"ANALYSIS OF COMPONENT EXERGETIC EFFICIENCY CHAMBER CONVECTIVE DRYER\",\"authors\":\"Oleksandr Spivak, Natalia Rezydent, Yaroslav Krymnyak\",\"doi\":\"10.31649/2311-1429-2023-1-101-106\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A methodology for calculating individual components of the exergy balance and the exergy coefficient of useful action for non-stationary heat and mass transfer processes, in particular drying processes, is proposed. It is shown that the analysis of the drying process by exergetic characteristics is more effective than by thermal characteristics, as it makes it possible to estimate both internal and external losses, as well as the potential of energy flows. Calculations of exergetic and thermal efficiency of the chamber convective dryer were performed on the basis of the proposed methodology. It was established that when the temperature of the incoming heat carrier changes from 5 to 35°С, the exergetic efficiency of the drying unit changes within 4...16%, while the thermal efficiency determined using heat balance equations is about 50%. It is shown that with an increase in the temperature of the surrounding environment, the exergetic efficiency of chamber drying units decreases significantly, and the thermal efficiency changes within 5%, while it increases with an increase in the temperature of the heat carrier at the input, and decreases with an increase in the temperature of the heat carrier at the outlet in such the very limits. Exergy losses in drying plants are due to losses caused by flows of substances that carry exergy out of the system, losses as a result of heat exchange at a finite temperature difference, or mass exchange at a finite concentration difference, as a result of mechanical friction and hydraulic resistance, chemical reactions in non-equilibrium conditions, reduction of the magnetic or electric field under the action of electric resistance, etc. To increase the exergy efficiency of chamber drying units, it is necessary to reduce the exergy losses in the heaters, therefore it is preferable not to use steam heaters, it is worth giving preference to electric heaters or pyrolysis boilers of indirect air heating. It is also necessary to reduce heat loss during mixing of spent and fresh heat carrier, to reduce the temperature of the incoming heat carrier.\",\"PeriodicalId\":221366,\"journal\":{\"name\":\"Modern technology, materials and design in construction\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-07-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Modern technology, materials and design in construction\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.31649/2311-1429-2023-1-101-106\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Modern technology, materials and design in construction","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.31649/2311-1429-2023-1-101-106","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

提出了一种计算非稳态传热传质过程(特别是干燥过程)的火用平衡各分量和有用作用的火用系数的方法。结果表明,用火用特性对干燥过程的分析比用热特性的分析更有效,因为它可以估计内部和外部损失,以及能量流的潜力。在此基础上,对室内对流干燥机的火用效率和热效率进行了计算。结果表明,当进料热载体温度从5℃变化到35℃С时,干燥机组的火用效率在4…16%,而利用热平衡方程确定的热效率约为50%。结果表明:随着周围环境温度的升高,腔室干燥机组的火用效率显著降低,热效率变化幅度在5%以内,在此范围内,热效率随输入热载体温度的升高而增大,随出口热载体温度的升高而减小。干燥设备中的火用损失是由于携带火用的物质流出系统造成的损失、有限温差下的热交换或有限浓度差下的质量交换造成的损失、机械摩擦和水力阻力、非平衡条件下的化学反应、电阻作用下磁场或电场的减小等造成的损失。为了提高室室干燥机组的火用效率,必须减少加热器中的火用损失,因此最好不要使用蒸汽加热器,而应优先选用间接空气加热的电加热器或热解锅炉。还需要减少废热载体和新鲜热载体混合过程中的热损失,以降低进料热载体的温度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ANALYSIS OF COMPONENT EXERGETIC EFFICIENCY CHAMBER CONVECTIVE DRYER
A methodology for calculating individual components of the exergy balance and the exergy coefficient of useful action for non-stationary heat and mass transfer processes, in particular drying processes, is proposed. It is shown that the analysis of the drying process by exergetic characteristics is more effective than by thermal characteristics, as it makes it possible to estimate both internal and external losses, as well as the potential of energy flows. Calculations of exergetic and thermal efficiency of the chamber convective dryer were performed on the basis of the proposed methodology. It was established that when the temperature of the incoming heat carrier changes from 5 to 35°С, the exergetic efficiency of the drying unit changes within 4...16%, while the thermal efficiency determined using heat balance equations is about 50%. It is shown that with an increase in the temperature of the surrounding environment, the exergetic efficiency of chamber drying units decreases significantly, and the thermal efficiency changes within 5%, while it increases with an increase in the temperature of the heat carrier at the input, and decreases with an increase in the temperature of the heat carrier at the outlet in such the very limits. Exergy losses in drying plants are due to losses caused by flows of substances that carry exergy out of the system, losses as a result of heat exchange at a finite temperature difference, or mass exchange at a finite concentration difference, as a result of mechanical friction and hydraulic resistance, chemical reactions in non-equilibrium conditions, reduction of the magnetic or electric field under the action of electric resistance, etc. To increase the exergy efficiency of chamber drying units, it is necessary to reduce the exergy losses in the heaters, therefore it is preferable not to use steam heaters, it is worth giving preference to electric heaters or pyrolysis boilers of indirect air heating. It is also necessary to reduce heat loss during mixing of spent and fresh heat carrier, to reduce the temperature of the incoming heat carrier.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信