【正文】 .............................................40 平臺(tái)、扶梯質(zhì)量 ................................................................................40 操作時(shí)塔內(nèi)物料質(zhì)量 ........................................................................40 充水質(zhì)量 ............................................................................................40 地震載荷計(jì)算 ...........................................................................................41 計(jì)算危險(xiǎn)截面的地震彎矩 ................................................................41 風(fēng)載荷計(jì)算 ...............................................................................................41 風(fēng)力計(jì)算 ............................................................................................41 風(fēng)彎矩計(jì)算 ........................................................................................42 各種載荷引起的軸向應(yīng)力 .......................................................................43 計(jì)算壓力引起的軸向應(yīng)力 ................................................................43 操作質(zhì)量引起的軸向壓應(yīng)力 ............................................................43 最大彎矩引起的軸向應(yīng)力 ................................................................44 筒體和裙座危險(xiǎn)截面的強(qiáng)度與穩(wěn)定性校核 ...........................................44 筒體的強(qiáng)度與穩(wěn)定性校核 ................................................................44 裙座的穩(wěn)定性校核 ............................................................................45 裙座和筒體水壓試驗(yàn)應(yīng)力校核 ...............................................................45 筒體水壓試驗(yàn)應(yīng)力校核 ....................................................................45 裙座水壓試驗(yàn)應(yīng)力校核 ....................................................................46 基礎(chǔ)環(huán)設(shè)計(jì) ...............................................................................................46 基礎(chǔ)環(huán)尺寸 ........................................................................................46 基礎(chǔ)環(huán)尺寸的應(yīng)力校核 ....................................................................47 基礎(chǔ)環(huán)厚度 ........................................................................................47 地腳螺栓計(jì)算 ...........................................................................................47 地腳螺栓承受的最大拉應(yīng)力 ............................................................47 地腳螺栓直徑 ....................................................................................487 輔助設(shè)備設(shè)計(jì) .................................................................................................49 儲(chǔ)罐的選擇 ...............................................................................................49 儲(chǔ)罐的計(jì)算與選型 ............................................................................49 泵的選擇 ...................................................................................................49 通風(fēng)機(jī)的選擇 ...........................................................................................50 通風(fēng)機(jī)的選擇 ....................................................................................50 換熱器的計(jì)算 ...........................................................................................50 確定換熱器的類型 ............................................................................50 估算傳熱面積 ....................................................................................508 全廠總平面布置 .............................................................................................53 全廠總平面布置的任務(wù) ...........................................................................53 全廠總平面設(shè)計(jì)的原則 ...........................................................................53 全廠總平面布置內(nèi)容 ...............................................................................53 全廠平面布置的特點(diǎn) ...............................................................................53 全廠人員編制 ...........................................................................................539 總結(jié)討論 .........................................................................................................55 設(shè)計(jì)主要完成任務(wù) ....................................................................................55 設(shè)計(jì)過程的評(píng)述和有關(guān)問題的討論 .......................................................55參考文獻(xiàn) ..........................................................................................................56致謝 ..................................................................................................................57附錄 A..............................................................................................................58 1 概 述二甲醚(Dimethyl Ether，簡(jiǎn)稱 DME)習(xí)慣上簡(jiǎn)稱甲醚，為最簡(jiǎn)單的脂肪醚，分子式 C2H6O，是乙醇的同分異構(gòu)體，結(jié)構(gòu)式 CH3—O—CH3，分子量 ，是一種無色、無毒、無致癌性、腐蝕性小的產(chǎn)品。The design of dimehyl ether process annual output 400,000 tons Ma Pengjun(Grade06,Class 1, Major Chemical Engineering and Technology ,School of Chemical and environmental sciences,Shaanxi University of Technology,Hanzhong 723000,Shaanxi)Tutor: LI ZhizhouAbstract: As LPG and oil alternative fuel, DME has drawn attentions at present. Physical properties of DME is similar for LPG, and don’t produce bustion gas to damage the environment, so, It can be produced largely. Like methane, DME is expected to bee 21st century energy sources., DME is prepared by methanol dehydration, namely, synthetic methanol first and then methanol dehydration to dimethyl etherby methanol dehydration. Methanol dehydration to DME is divided into two kinds of liquid phase and gasphase process. This design uses a process gas of dimethyl ether prepared by dimethyl. Heating methanol to evaporation, methanol vapor through the γAL 2O3 catalyst bed, vapor methanol dehydration to dimethyl etherby. This process is made of methanol process heating, evaporation, dehydration of methanol, dimethyl ether condensation and distillation etc. Completed for the following work: 1) Distillation tower used in separation of dimethyl ether and methanol recovery , column height of tower ,diameter, arrangement of column plate etc。氣相法的工藝過程主要由甲醇加熱、蒸發(fā)、甲醇脫水、二甲醚冷凝及精餾等組成。甲醇脫水制二甲醚分為液相法和氣相法兩種工藝，本設(shè)計(jì)采用氣相法制備二甲醚工藝。與甲烷一樣，被期望成為 21 世紀(jì)的