【正文】 在管子表 面沉積的可能，管壁內(nèi)、外側(cè)表面上的污垢熱阻減小；但同時(shí)流體阻力增大，換熱面積減小，設(shè)備投資減少；但同時(shí)流體阻力增大，壓力降增大，動(dòng)力消耗增大，操作費(fèi)用增大。進(jìn)出口溫度、壓力由工藝要求確定。它的特點(diǎn)是殼體和管束的熱膨脹是自由的，管束可以抽出，便于清洗管間和管內(nèi)。換熱器是石油化工、冶金、電力等行業(yè) 的主要設(shè)備，其設(shè)計(jì)制造水平的高低直接關(guān)乎換熱效果，影響能耗。浮頭式冷卻器根據(jù)其管束支承結(jié)構(gòu)不同可分為四種形式：板式支承，如折流板換熱器；桿式支承，如折流桿換熱器；空心環(huán)支承，如空心環(huán)換熱器；管子自支 承，如刺孔膜式換熱器。 國內(nèi)外發(fā)展及研究動(dòng)態(tài) 理論研究 浮頭式冷卻器主要由管箱、管板、管子、殼體和折流板等構(gòu)成。 關(guān)鍵詞： 浮頭式 對二甲苯 管殼式換熱器 冷卻器 摘要 Ⅱ The Design of floating head pxylene cooler Abstract As process equipment, all types of heat exchangers are widely used in petrochemical, pharmaceutical, metallurgy, refrigeration and other departments. The heat exchanger should be designed in accordance with the process parameters and conditions to meet the requirements of the specific conditions and harsh operating conditions. Shell and tube heat exchanger has a solid structure, flexible operation, high degree of reliability, the use of a wide range, so is still widely used in engineering. HTFS software process design of heat exchangers has bee monplace, but in order to make the design of heat exchangers can better meet the needs of a variety of conditions, there are still many aspects need to be fully considered in the design. This article is the design of the floating head pxylene cooler, and its main contents and conclusions are as follows: Design a floating head pxylene cooler ,determine the selection of shell and tube heat exchanger type of heat exchanger tube, the fluid toward and direction to determine the cooling medium. Finally, giving related reasons. Have a certain impact on the pxylene nature of the process design, process design results may have a direct impact on the thermodynamic calculation and mapping of late, so how to make a choice, you need a certain amount of GB and literature, will be a difficulty. For inquiries on the physical parameters of the pxylene, the corresponding physical parameters of pxylene in the state ok Practical Thermal Physical Properties Of Manual Queries. Deal with the basic data, then the cooler design of the structure, an initial heat transfer coefficient, and select the appropriate pipe size, count the heat transfer area, cooler tube side and shell side of the structure size, including the flow tube size, pipe length, diameter, to take over. The size of the shell determined by the arrangement of the tubes, the layout of the pipe as far as possible should be uniform and reasonable so as not to cause the stress caused by the uneven heating. 本科生畢業(yè)設(shè)計(jì)（論文） Ⅲ Followed by a cooler thermal calculation. According to the shell and tube heat transfer coefficient, and the related thermal resistance and related factors to calculate the overall heat transfer coefficient. Then calculated according to the fouling resistance of the tube side and shell side. The work done in this paper is on the preparatory work of a floating head the pxylene cooler design and design calculations of a set of processes, attention to points in the process of analysis and the cooler design, and how by changing the relevant variables to improve the cooler performance provides a theoretical basis. Key words: Floating Head, Pxylene, Shell And Tube Heat, Cooler 本科生畢業(yè)設(shè)計(jì)（論文） 1 目 錄 摘 要 .....................................................................................................Ⅰ ABSTRACT............................................................................................Ⅱ 第一章 緒 論 ......................................................................................1 課題背景 ....................................................................................................1 國內(nèi)外發(fā)展及研究動(dòng)態(tài) ............................................................................1 理論研究 ...........................................................................................1 實(shí)驗(yàn)研究 ...........................................................................................5 設(shè)計(jì)方法研究 ....................................................................................7 課題研究的意義 ........................................................................................7 第二章 熱力計(jì)算 ....................................................................................8 流體走向選擇 ............................................................................................8 已知數(shù)據(jù) ....................................................................................................8 流體的物性參數(shù) ........................................................................................9 傳熱量與平均溫差 ...................................................................................10 估算傳熱面積與傳熱面結(jié)構(gòu) ...................................................................10 管 程計(jì)算 ...................................................................................................13 殼程結(jié)構(gòu)及殼程計(jì)算 ...............................................................................13 需用傳熱面積 ...........................................................................................16 阻力計(jì)算 ...................................................................................................17 第三章 結(jié)論與展望 ...............................................................................19 結(jié)論 ...........................................................................................................19 展望 ...........................................................................................................19 參考文獻(xiàn) .................................................................................................21 符號(hào)表 .....................................................................................................22 致謝 ..............................................................................................