【正文】 畢 業(yè) 設(shè) 計（論文） 學(xué)生姓名： xxx 學(xué) 號： 所在學(xué)院： 專 業(yè)： 設(shè)計 (論文 )題目 : 浮頭式對二甲苯冷卻器的設(shè)計 指導(dǎo)教師： 2022 年 6 月 本科生畢業(yè)設(shè)計（論文） Ⅰ 浮頭式對二甲苯冷卻器的設(shè)計 摘 要 各種類型的換熱器 作為工藝過程重要的設(shè)備，廣泛應(yīng)用于石油化工、醫(yī)藥、冶金、制冷等部門。換熱器應(yīng)按照工藝參數(shù)及條件進(jìn)行設(shè)計，滿足特定工況和苛刻操作條件的要求。管殼式換熱器具有結(jié)構(gòu)堅固、操作彈性大、可靠程度高、使用范圍廣等優(yōu)點，所以在工程中仍得到普遍使用。采用 HTFS 軟件進(jìn)行換熱器工藝設(shè)計已很普遍，但為了使設(shè)計出來的換熱器能更好地滿足各種工況，仍然有許多方面需在設(shè)計時加以充分考慮。 本文是對浮頭式對二甲苯冷卻器的設(shè)計，其主要研究內(nèi)容和結(jié)論如下： 設(shè)計一臺浮頭式對二甲苯冷卻器，首先進(jìn)行冷卻器的工藝設(shè)計，確定選用的管殼式換熱器的類型 、換熱器的管型、流體的走向和流向、確定相關(guān)的冷卻介質(zhì)，最后給出相關(guān)的理由。對二甲苯的性質(zhì)對于工藝設(shè)計有一定的影響，而工藝設(shè)計的結(jié)果又可能直接影響到后期的熱力計算和制圖，所以如何正確的做出選擇，需要查詢一定量的國標(biāo)和文獻(xiàn)。 然后對于對二甲苯的物性參數(shù)的查詢，通過《實用熱物理性質(zhì)手冊》查詢對應(yīng)狀態(tài)下的對二甲苯的物性參數(shù)。處理完基本數(shù)據(jù)，接著對冷卻器進(jìn)行結(jié)構(gòu)的設(shè)計，初定換熱系數(shù)，選擇合適的管子尺寸，算的換熱面積，冷卻器管程和殼程的相關(guān)結(jié)構(gòu)尺寸，包括這流管尺寸、管子長度、接管直徑等。殼程的尺寸通過管子的排布而確定， 管子的布置盡量要均勻合理，以免導(dǎo)致受熱不均引起的應(yīng)力。 接著進(jìn)行冷卻器的熱力計算。根據(jù)殼程和管程的傳熱系數(shù)，結(jié)合相關(guān)熱阻和相關(guān)影響因素，算出系統(tǒng)總傳熱系數(shù)。然后根據(jù)水和對二甲苯的污垢熱阻算出管程和殼程阻力。 本論文所做的工作是對浮頭式對二甲苯冷卻器設(shè)計的準(zhǔn)備工作和設(shè)計計算的一整套過程，分析并研究冷卻器設(shè)計過程中相關(guān)注意點，并怎樣通過改變相關(guān)變量來提高冷卻器的性能，為日后冷卻器的相關(guān)設(shè)計研究提供了一定的理論基礎(chǔ)。 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（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（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)展及研究動態(tài) ............................................................................1 理論研究 ...........................................................................................1 實驗研究 ...........................................................................................5 設(shè)計方法研究 ....................................................................................7 課題研究的意義 ........................................................................................7 第二章 熱力計算 ....................................................................................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 程計算 ...................................................................................................13 殼程結(jié)構(gòu)及殼程計算 ...............................................................................13 需用傳熱面積 ...........................................................................................16