【正文】 L , effective length of tube, m。 A , heat transfer area based on the tube out diameter, m2, which can be calculated using Eq. 4 .N, tube number。 R o, fouling coefficient for shell side, (m2K)/W。ho , heat transfer coefficient for shell side, W/(m2K)。12013容器與封頭的材料Q345R 14容器與封頭的許用應力17015鞍座材料16鞍座材料許用應力12517容器自重200018物料重量150019總重量3500沈陽化工大學學士學位論文 參考文獻參考文獻[1] 崔海亭,姚仲鵬,[J].石油化工設備,2001,30(2):3436[2] 方書起,祝春進,吳勇,[J].化工機械,2004,31(4):24925[3] [J].煉油設計,2001,31(8):2833.[4] [J]. ChemicalEngineering,1986,93(3)[5] [J]. 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Wei Liu ?Weiwei Li Received: 9 July 2009 / Accepted: 3 March 2010 / Published online: 24 February 2011 SpringerVerlag 2011 Abstract A shellandtube heat exchanger with new typeof baffles, is designed, fabricated and tested. The experimental investigation for the proposed model and the original segmental baffle heat exchanger are conducted. Theoperation performances of the two heat exchangers are also pared. The results suggest that, under the same conditions, the overall performance of the new model is20–30% more efficient than that of the segmental baffleheat exchanger.1 IntroductionHeat exchanger is a very important apparatus in manyfields, such as petroleum refining, power generation,chemical engineering, process industry, food industry, the different types of heat exchangers, shellandtube heat exchanger (STHX) has many advantages such asreliable structure, mature techniques and wide applicability, which make it widely utilized in various industries [ 1 ].The baffle element plays very important roles in STHX,such as supporting the tube bundles and disturbing the fluidof shell side. According the direction of fluid flow of shellside, the STHX can be divided into three groups: transverse flow, longitudinal flow and helical flow. The characteristicsof pressure drop and heat transfer in shell side of the STHX vary under different flow states, which have a heavy impacton the performance of the heat exchangers.The traditional shellandtube heat exchanger with segmental baffles (SBSTHX) have many disadvantages, such as high pressure drop, low heat transfer efficiency, harmful vibration caused by the shellside flow which is normal to tube bundles. When the traditional segmental baffles areused in STHX, higher pumping power is often required tooffset the higher pressure drop under the same heat , a new type of STHX using different types of baffles might achieve higher heat transfer efficiency and lower pressure drop. Pressure drop and heat transfer are two interdependent factors influencing the capital and operating costs of the heat exchange systems. In order to improve the performance, heat exchangers with different types of baffles are developed, which have relatively higher heat transfer efficiency and relatively lower pressure drop,such as rod baffles and helical baffle exchangers [ 2 – 11]. Therefore, the main objectives of this study are to develop an STHX with new type of baffles to overe the deficiencies mentioned above and to experimentally investigate its performance. Moreover, performance of the new STHX is also pared with that of SBSTHX in this study.The dimension of the heat exchanger isU159 mm 95 mm. The detailed parameters of heat exchangers are shown in Tables 1 and 2 .2 Configuration and fabrication of the STHX with new type of bafflesThe helical type of fluid flow in shell side of the STHX with helical baffles has led to some advantages such as high heat transfer efficiency and low flow resistance [ 5 , 6 , 8 ]. Nevertheless, it is difficult to manufacture the continuous helical baffles. In order to address this problem, flowerbaffles STHX (FBSTHX), a new type of STHX based on the traditional segmented baffle, is proposed in this paper and shown schematically as in Fig. 1 . As seen in Fig. 1 ,around baffle can be divided into four quadrants, and among the four quadrants, at least one quadrant is hollow for fluid flowing, and the remaining quadrants are used to support the heat tube. As the flower baffles are installed alternately, the phase angles (the angles for hollow parts of the two adjacent baffles) can be 30,60 ,or90 . Under different application situations, the phase angles may vary. From Fig. 1 it can also be observed that the configuration of all baffles in FBSTHX is the same。水壓試驗比較筒體的水壓試驗和短節(jié)的水壓試驗同樣可以滿足要求。. 折流板的選擇 選型根據(jù)GB151—1999《管殼式換熱器》圖 37 選擇單弓形水平放置的折流板。序號項目符號單位數(shù)據(jù)來源和計算公式數(shù)值1殼程圓筒材料線膨脹系數(shù)GB15019981062換熱管材料線膨脹系數(shù)GB15019981063換熱管與殼程圓筒的膨脹變形差1044沿長度平均的殼程圓筒金屬溫度工藝給定1605沿長度平均的換熱管金屬溫度工藝給定1106制造環(huán)境溫度207當量壓力組合8有效壓力組合Pa9基本法蘭力矩系數(shù)10管程壓力下的法蘭力矩系數(shù)10411管板邊緣