應(yīng)用化學(xué)專業(yè)文獻(xiàn)翻譯中英文對(duì)照-預(yù)覽頁
【正文】 ill be circulation rate reduction will result in the reduction of heat transfer,thus the cover back to the fluid nozzle is clearly an important reason for fluctuations in the reboiler duties. Noncondensable gas in the water vapor 本科畢業(yè)設(shè)計(jì) —— 文 獻(xiàn)翻譯 5 Steam reboiler to run the process,water vapor may be noncondensable gases,or the reboiler leak,the hydrocarbon vapor or other noncondensable gas into the reboiler,the noncondensable gas into the reboiler pipingthereby reducing the heat transfer capacity of the reboiler with the distillation column within a circulating fluid,thus causing the reboiler heat transfer efficiency decreased. 4 Conclusion In view of these problems often appear in a production run affect the operation of the distillion unit,leading ton the top of the tower or the bottom of product failure,seriously restricting the production device to run resulting in product order to avoid such things from bappening,the operator should do the following: storage and transportation of materials Plate column distillation process must be set in place a number of different volume raw material storage tanks,pumps and all kinds of heat exchanger has been temporarily stored,transported and preheating(cooling)of materials used,in order to protect the device can be a continuous and stable operation. Necessary means of detection In order to facilitate the resolution of the problem in the operation shall be the appropriate place in the process to set the necessary instrumentation,as well as to obtain the pressure,temperature and other addition,often set in a particular place manholes and hand holes,so that regular testing and maintenance. Adjustment device State parameters are not in the actual production value should be placed in the appropriate location of a certain number of the valve to be adjusted to achieve the production requirements,can be a double adjustment,that is both automatic and manual adjustment coexist,and at any timeswitch. 本科畢業(yè)設(shè)計(jì) —— 文 獻(xiàn)翻譯 6 板式精餾塔的操作 吳昌祥 （哈爾濱氣化廠，黑龍江 哈爾濱 154864） 摘要：本文通過對(duì)影響精餾塔因素的分析及異?，F(xiàn)象剖析，分析精餾過程從而指導(dǎo)實(shí)際操作。蒸汽從塔底進(jìn)入，與下 降液進(jìn)行逆流接觸，兩相接觸中，下降液中 的易揮發(fā)（低沸點(diǎn)）組分不斷地向蒸汽中轉(zhuǎn)移，蒸汽中的難揮發(fā)（高沸點(diǎn)）組分 不斷地向下降液中轉(zhuǎn)移。 與其它化工單元操作相比，精餾裝置雖然比較簡(jiǎn)單， 但 生產(chǎn)運(yùn)行中經(jīng)常出現(xiàn)各種各樣的問題而影響精餾裝置的操作，從而導(dǎo)致塔頂或塔底產(chǎn)品不合 格，嚴(yán)重制約生產(chǎn)裝置的運(yùn)行從而造成產(chǎn)品損失。在平衡操作中，釜溫突然升高，來不及調(diào)整相應(yīng)的壓力和溫度時(shí)，必然導(dǎo)致塔釜液被蒸空，壓力升高。當(dāng)受到外界因素的影響而使操作壓力受到破壞時(shí)，塔的正常操作本科畢業(yè)設(shè)計(jì) —— 文 獻(xiàn)翻譯 7 就會(huì)完全破壞。加料量過低，塔的平衡操作不好維持，蒸汽速度減小，塔板容易漏液，精餾效率較低。若從塔釜得到產(chǎn)品，則塔頂損失增加。 在精餾操作中，提高回流比，可以提高產(chǎn)品的質(zhì)量，但回流比過大，塔內(nèi)的內(nèi)循環(huán)量增加，增加能耗。其產(chǎn)生的原因在于液體阻滯在降液管內(nèi)而使塔板上液位升高，塔板間霧夾帶過量而使塔板效率降低，此現(xiàn)象稱為過量霧夾帶或蒸氣液泛，其原因是相對(duì)于較大的氣量而塔板上鼓泡區(qū)過小。 本科畢業(yè)設(shè)計(jì) —— 文 獻(xiàn)翻譯 8 提升管中的團(tuán)狀流動(dòng) 提升管中的團(tuán)狀流動(dòng)是精餾塔運(yùn)行不穩(wěn)定的問題，可能是由于垂直管線中不平穩(wěn)的氣液混合流引起的。 3. 再沸器 再沸器在精餾塔中占有很重要的位置，它用以將塔底液體部分汽化后送回精餾塔，是塔內(nèi)氣液兩相間接觸傳質(zhì)得以進(jìn)行。 在 確定精餾塔生產(chǎn)能力受限制的因素中，查找再沸器故障是最費(fèi)力的問題，精餾塔大多數(shù)都采用水蒸氣進(jìn)行再沸。循環(huán)量降低會(huì)導(dǎo)致熱傳遞的減少，因而蓋住回液管口顯然是再沸器負(fù)荷波 動(dòng)的一個(gè)重要原因。 必要的檢測(cè)手段 為了方便解決操作中的問題，須在流程中適當(dāng)位置設(shè)置必要的儀表，以及時(shí)獲取壓力、溫度等各
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