化工原理課程設(shè)計(jì)wxl課程設(shè)計(jì)-在線(xiàn)瀏覽
2025-03-07 14:26本頁(yè)面
【正文】 al/mol?℃20 9315 30 9225 40 9133 50 9040 60 8945 70 8848 80 8750 90 8650 100 8547 110 8443 120 8337 167。 物料衡算F = 3t/day (PCT+OCT)=(3000kg)/(24h)=Zf OCT = 40%(mol) XD OCT = 80%(mol) XW OCT = 20%(mol) D= kmol/h 解得 W= kmol/h167。，假設(shè)進(jìn)料為第30塊理論板，采用CY型絲網(wǎng)填料，等板高度5塊/m,填料壓降5mmHg/m,則每塊理論板壓降為1mmHg/塊，則進(jìn)料板處的壓力為：+（30/760）= 。進(jìn)料中OCT：= PCT==所以塔頂產(chǎn)品中OCT的回收率=DXD/FZF=塔頂產(chǎn)品中PCT的回收率=D(1XD)/[F(1ZF)]=，則塔底壓力為： +（40/760）=軟件參數(shù)設(shè)置及主要計(jì)算步驟：1．Data，Setup specifications Global①Title: Separation of OVT and PCTDSTWU②Input data: MET Accounting: WXL Report Options, Stream①Fraction basis: Mole ②Stream format: TFF: FULL Specification Selection: Component ID type Component name Formula OCT Conventional ochlorotoluene C7H7CLD2PCT Conventional pchlorotoluene C7H7CLD3 Global: Base method: UNIFAc在主窗口下建立一精餾塔模型并連接物料流股線(xiàn)并重命名得下圖所示流程圖。嚴(yán)格計(jì)算法模擬流程圖5. Data,Setup,Streams FEED, SpecificationState variable:Vapor fraction: 0 Pressure： (NF=30)Total flow: Composition: MoleFrac: OCT= PCT=,RADFRAC,SetupNumber of stages: 44Condenser: TotalDistillate rate Mole Reflux ratio Mole StreamsFeed stage 30Product streams: Top 1(stage) Liquid Botm 44(stage) LiquidStage1/Condenser pressure: Stage pressure drop: 1mmHg/塊= or Column pressure drop:44mmHg=(44/760)= MPa，由Data, Setup, Blocks, RADFRAC, Results Summary Summary View Condenser/Top stage Reboiler/Bottom stage ResultsTop: OCT= Botm: OCT=，重新計(jì)算在Blocks, RADFRAC, Setup中修改Configuration: Number of stage和 Stream: Feed的參數(shù)并進(jìn)行重新計(jì)算，最終參數(shù)修改為：Configuration: Number of stage 51Stream: Feed 30計(jì)算得結(jié)果如下：Stream ResultsTop: OCT= Botm: OCT=, RADFRAC, Design SpecsNew, 1, OKType Mole purityTarget ProductComponents OCT Feed/Product Streams Top Vary, New, 1, OKType: Reflux ratioLower bound: 15Upper bound: 25，由Vary, Results=, RADFRAC, Setup, 重新輸入 Reflux Ratio=Stream ResultsTop: OCT= Botm: OCT=注：具體計(jì)算結(jié)果見(jiàn)附錄。 壓降校核1. 選取填料CY型絲網(wǎng)填料 當(dāng)量理論板數(shù) 5塊/m填料 填料壓降 Δp= 1 mmHg/每塊理論板2. 填料層壓降校核 塔頂 P頂= 120 mmHg（） (控制壓力) 塔底 P底= P頂 + NT 1 mmHg=120 mmHg +511 mmHg=171 mmHg167。HF + QB = QC + HD + HWHF ：進(jìn)料焓 HD ：塔頂產(chǎn)品焓 HW：塔底產(chǎn)品焓 QC：全凝器冷凝負(fù)荷 QB ：再沸器熱負(fù)荷1. 進(jìn)料焓的計(jì)算 HF TF==℃所以進(jìn)料液體的定性溫度（TF + 20℃）/2=℃查石油化工基礎(chǔ)數(shù)據(jù)手冊(cè)并由插值法得定性溫度下的比熱：CFPCT= cal/mol?℃ CFOCT= cal/mol?℃則進(jìn)料液體的平均比熱：CFm= CFOCTZF + CFPCT(1ZF)=?℃40%(mol)+?℃(140%)(mol)= cal/mol?℃則進(jìn)料液體焓：HF= F CFm(TF ―20℃) = cal/mol?℃(℃―20℃)=2. 塔頂產(chǎn)品焓的計(jì)算 HDTD=℃定性溫度=（TD + 20℃）/2=℃查石油化工基礎(chǔ)數(shù)據(jù)手冊(cè)并由插值法得定性溫度下的比熱：CDPCT= cal/mol?℃ CDOCT= cal/mol?℃則塔頂產(chǎn)品的平均比熱：CDm= CDOCTXD + CDPCT (1XD)= cal/mol?℃80%(mol)+ cal/mol?℃(180%)(mol)= cal/mol?℃則HD= D CDm(TD―20℃) = cal/mol?℃(℃―20℃)=3. 塔底產(chǎn)品焓的計(jì)算HW TW==℃定性溫度=（TW + 20℃）/2=℃查石油化工基礎(chǔ)數(shù)據(jù)手冊(cè)并由插值法得定性溫度下的比熱：CWPCT=
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