CAJ | 학술논문

某石化公司炼油厂第二套常减压装置中换热器的热交换介质为高黏度的原油及其附属产品,在对流换热过程中传热系数低,动能消耗大.针对这一现状,本文设计了一种换热管内插间歇半扭带,利用计算流体力学软件 Fluent 对内插间歇半扭带换热管在实际工况下的换热过程进行数值模拟,与光滑管、内插连续扭带换热管进行了对比,并给出了间歇半扭带传热元件的优化设计参数.结果表明:内插间歇半扭带大幅提高了换热管内流体的努塞尔数Nu,同时也使换热管内摩擦阻力系数f增大;间歇半扭带换热管的换热效率η比内插连续扭带换热管提高8%~12%;当间歇半扭带的扭曲率y为10、连接杆长度s为345mm时,换热效率η最高,达到2.06.研究结果为该常减压装置换热器强化传热的研究提供了理论依据.
모석화공사련유엄제이투상감압장치중환열기적열교환개질위고점도적원유급기부속산품,재대류환열과정중전열계수저,동능소모대.침대저일현상,본문설계료일충환열관내삽간헐반뉴대,이용계산류체역학연건 Fluent 대내삽간헐반뉴대환열관재실제공황하적환열과정진행수치모의,여광활관、내삽련속뉴대환열관진행료대비,병급출료간헐반뉴대전열원건적우화설계삼수.결과표명:내삽간헐반뉴대대폭제고료환열관내류체적노새이수Nu,동시야사환열관내마찰조력계수f증대;간헐반뉴대환열관적환열효솔η비내삽련속뉴대환열관제고8%~12%;당간헐반뉴대적뉴곡솔y위10、련접간장도s위345mm시,환열효솔η최고,체도2.06.연구결과위해상감압장치환열기강화전열적연구제공료이론의거.
The high viscosity of the heat transfer medium in the crude oil distillation unit in oil refinery process will normally lead to low heat transfer efficiency and high kinetic energy consumption. To solve the problem,this research designed a segmented semi-twisted tape to conduct numerical simulation of the heat transfer process of the tube with a segmented semi-twisted tape under actual conditions,using FLUENT. The heat transfer parameters in plain tube and tube with a continuous twisted tape were compared. The simulation provided optimum design parameters of the segmented semi-twisted tape. The results showed that the segmented semi-twisted tape improved Nu(Nusselt number) of the fluid in a heat transfer tube as well asf(friction factor),and η(heat transfer efficiency) of the tube with a segmented semi-twisted tape was increased by 8%-12% compared the tube with a continuous twisted tape. The value of η reached the highest number of 2.06 wheny(twist ratio of the segmented semi-twisted tape)was 10 ands(length of the connection rod) was 345mm. The results provided a theoretical basis for the study of enhanced heat transfer of a heat exchanger in a crude oil unit.