不同溫度下空氣中飽和水分含量及飽和蒸汽壓

不同溫度下空氣中飽和水分含量及飽和蒸汽壓..

不同溫度下空氣中飽和水分含量及飽和蒸汽壓蘭州真空設(shè)備有限責(zé)任公司溫度℃飽和水分含量g/m3飽和蒸汽壓Pa溫度℃飽和水分含量g/m3飽和蒸汽壓Pa4050.917368.624-121.81217.38243846.006618.708—141.52181.28523641.515935.392—161.27150.78243437.405314.68-181.06125.074832C八33.64C八C八4483.512-200.888八rcc103.36323030.304238.42-220.73685.2482827.203776.22-240.59070.06322624.303357.972-260.50457.2762421.802981.016-280.41446.75322219.402641.356-300.34038.09522017.302336.33-320.27730.76921815.362061.936-340.22624.90841613.631815.516-360.18420.11321412.051597.068-380.14916.11721210.681401.264-400.12012.9204109.351226.77-420.09610.256488.281072.26-440.0778.125267.28933.732-460.0616.393646.39812.52-480.0495.061625.60704.628-500.0383.862804.85609.923-520.0303.0636-24.14516.816-540.0242.3976-43.52436.896-560.0181.8648-6300368.298-580.0141.4652-82.54309.8232-600.0111.0656-102.14259.74-900.0093粘滯流下20℃空氣的管道流導(dǎo)

《真空設(shè)計手冊》項目公 式長管〃1.34義103d4pU=l短管1 1 1 = + U UU短 孑L 管矩形截面直管4560Ka2b2_U= f pla/b1.00.90.80.70.60.50.40.30.20.1Kf1.000.990.980.950.900.820.710.580.420.23環(huán)形管道〃1340方「/小(d—d*U= Px[d—d——1 2—]l 1 21n(d/d)1 2橢圓管道「42920—a3b3U= p l a2+b2孔當(dāng). 時，——一二 A1>x>0.525」 U=76.6x0.712x<1-x0.228—0-、r, r 1-X當(dāng) 時，〃200Ax<0.525 U= 0> A 1—X當(dāng)…時，-1x<0.1J， U=200A0符號意 義單位U粘滯流下20℃至氣流導(dǎo)m3/Sd管道直徑ml管道長度m

a、b橢圓長半軸，短半軸mP管道中平均壓力PaA0孔面積m2x孔兩側(cè)壓力比粘滯流一分子流下管道流導(dǎo)"=12.1d31+271(dP)+4790(dP)"=12.11+316(dP)——1+316(dP)d:管道直徑l:管道長度PP:管道中平均壓力P=(P1+P2)/22分子流下20℃空氣的管道流導(dǎo)

《真空設(shè)計手冊》項目公 式圓長管U=12.1d3l圓孔_ U=9.11d2圓短管U=9.11d2xaL/d00.050.10.20.40.60.8a10.9650.9310.870.7690.690.6251.0246810204060801000.5720.40.250.1820.1430.1170.06250.0320.020.0010符號：U——流導(dǎo)（L/S）l 管長（5）a和b——橢圓長半軸、短半軸A面積（52）管道直徑（cm）材料物理性能組別牌號重度g/cm3膨脹系數(shù)dX106導(dǎo)熱系數(shù)卡鹿米.秒.度電阻系數(shù)Q.mm2/m熔點℃純銅T18.920℃17.70.961083T28.917.70.951080Y八CT48.8917.40.431080黃銅H908.818.2 << 0.40.039H808.6519.1 C.? 0.340.054H658.4720.10.2880.069H628.4320.60.260.071純鋁20~100℃20~200℃L62.712424.80.54658L42.712424.80.52LY112.82223.40.41鑄鋁ZL22.810.230.240.33~0.354.66~4.926ZL52.580.2450.2550.218.21 ZL102.650.190.210.385.27~5.57 ZL142.70.220.230.35~0.455.88~6.67碳鋼10鋼7.8511.60.8080.13245鋼7.8111.590.5020.132不銹鋼1Cr18Ni9~79-0.0390.0420.1630.731Cr18Ni9Ti7.750.0390.0420.1630.73GB5832.2-86氣體中微量水分的測定-露點法i適用范圍本標準適用于氧、氮、氫、氦、氖、氬、氪、氙、二氧化碳等氣體中微量水分露點的測定。其測量范圍0℃--70℃。2原理術(shù)語說明水分露點—一在恒定的壓力下，氣體中的水蒸氣達到飽和時的溫度。方法原理本法用露點儀進行測定。使被測氣體在恒定壓力下，以一定的流量流經(jīng)露點儀濺定室中的拋光金屬鏡面。該鏡面的溫度可人為地降低并可精確地測量。當(dāng)氣體中的水蒸氣隨著鏡面溫度的逐漸降低而達到飽和時，鏡面上開始出現(xiàn)露，此時所測量到的鏡面溫度即為露點。（由露點和氣體中水分含量的換算式或查表，即可得到氣體中微量水分含量。）儀器儀器可以用不同的方法設(shè)計，主要的不同在于金屬鏡面的性質(zhì)、用于冷卻鏡面的方法、如何控制鏡面的溫度、測定溫度的方法以及檢測出露的方法。鏡子和它的附件通常安放在氣體樣品流經(jīng)的測定室中。儀器的一般要求提供下述裝置、滿足基本要求的任何露點儀都可以使用。當(dāng)儀器溫度高于氣體中水分露點至少2℃時，可以控制氣體進出儀器的流量。把流動的樣品氣冷到足夠低的溫度，使得水蒸氣能凝結(jié)，冷卻的速度可調(diào)。能觀察露的出現(xiàn)和準確地測量露點。氣路系統(tǒng)死體積小且氣密性好，露點室內(nèi)氣壓應(yīng)接近大氣壓力。用標準樣衡量儀器是否符合要求，按GB4471-84《化工產(chǎn)品試驗方法精密度室間試驗重復(fù)性和再現(xiàn)性的確定》第4.3條進行。目視和光電露點儀簡單的露點儀以手動調(diào)節(jié)冷量，控制鏡面降溫速度，用目視法觀察露的生成。該法憑經(jīng)驗操作，人為誤差較大。采用光電系統(tǒng)確定露生成的光電露點儀有相當(dāng)高的準確度和精密度；用戶按需要和可能進行選擇。露的觀察目視露點儀用肉眼觀察露的出現(xiàn)。光電露點儀是采用裝在測定室的光源照射鏡面，光源和光電池能以各種方式排列，當(dāng)鏡面未結(jié)露時，無散射發(fā)生，硅光電池上沒有光照，鏡面上結(jié)露后，入射光在鏡面發(fā)生散射，一部分光照射到硅光電池上從而產(chǎn)生光生電壓，給出出露信號。鏡面制冷方法用下述方法來降低和調(diào)節(jié)鏡子溫度，其中3.5.1和3.5.2所介紹的方法要求操作人員注意觀察而不適用于自動裝置。對自動裝置，使用兩種方法制冷：3.5.3和3.5.4所介紹的液化氣體制冷及熱電效應(yīng)制冷。溶劑蒸發(fā)制冷用一種揮發(fā)性液體與鏡子背面接觸，用通入低壓空氣或其他壓縮氣體鼓泡的辦法使液體氣化而制冷。絕熱膨脹法制冷讓一種氣體通過噴嘴后流過鏡子背面，由于氣體發(fā)生膨脹而使鏡面冷卻，這種氣體通常用鋼瓶裝壓縮二氯化碳，也可以使用壓縮空氣和壓縮氮氣等。本法至少能使鏡面溫度下降40℃。液化氣體制冷目前廣泛使用液化氣體作冷卻劑。如用液氮可獲得-80℃或更低的溫度。當(dāng)用液化氣體制冷時，可以使和鏡子背面相接觸的銅棒與液化氣體直接接觸、或通過電熱方法使液化氣體氣化來制冷，也可以使壓縮氣體通過液氮浸泡著的盤管冷卻后制冷。用熱電（珀爾帖）效應(yīng)制冷該法也就是半導(dǎo)體制冷，采用多級串聯(lián)獲得不同的低溫。應(yīng)盡可能準確地測量出露時鏡面的溫度，為了避免鏡面上的溫度差異，應(yīng)使用高熱導(dǎo)性的鏡子，一般采用金、銅、不銹鋼和銠合金。測量露點溫度，使用精密水銀溫度計、熱電偶、熱敏電阻或鉑電阻感溫元件。目前，高精度測量都采用鉑電阻感溫元件。分析前的準備試漏測試系統(tǒng)所有接頭處應(yīng)無泄漏，否則會由于空氣中水分的滲入而使測量結(jié)果偏高。簡單的試漏方法如下：將盛有水的U型壓力計接在儀器的氣體出口處，調(diào)節(jié)氣路壓力，使U型管內(nèi)壓差為1000mmH2O,關(guān)閉氣源，經(jīng)5m行水柱下降不超過5mm，說明系統(tǒng)氣密性良好。必要時，應(yīng)升高壓力試漏。若發(fā)現(xiàn)系統(tǒng)漏氣，則應(yīng)分段檢查解決。取樣設(shè)備取樣閥：用死體積小的調(diào)節(jié)閥，如針形閥。取樣管：原則上采用盡可能短的小口徑管子，一般使用長度不超過2m，內(nèi)徑不大于4mm的不銹鋼管或壁厚不小于1mm的聚四氟乙烯管，使用前洗凈，再吹干或烘干。不允許用橡皮管。取樣閥的吹洗徽開取樣閥，開啟鋼瓶頂閥后立刻關(guān)閉。開大取樣閥待放出的氣流變小時關(guān)小取樣閥，再開啟鋼瓶頂閥后立刻關(guān)閉，如此反復(fù)三次，再進行測定。流量計的標定應(yīng)針對不同氣樣，用皂膜流量計標定樣品氣的測試流量。一般操作步驟用氣體吹洗管道和測定室。對放置后剛啟用的儀器，當(dāng)待測氣體中水分露點約為-60℃時，應(yīng)吹洗2h后才能進行測定。調(diào)節(jié)樣品氣流量至規(guī)定范圍內(nèi)。開始制冷，當(dāng)鏡面溫度離露點約5℃時，降溫速度應(yīng)不超過5℃/min，對不知道露點范圈的樣品氣，可先進行一次粗測。停機后，樣品氣的進出口擰上密封螺母。6注意事項干擾物質(zhì)概述當(dāng)固體顆?；蚧覊m等進入儀器并附著在鏡面上時，用光電法測得的露點值將偏離I除水蒸氣外的其他蒸氣也可能在鏡面上冷凝，使得所觀察到的露點不同于相應(yīng)的水蒸氣含量的露點。如果固體雜質(zhì)絕對不溶于水，它們就不會改變露點，但是會妨礙出露的觀察。在自動裝置中，對固體雜質(zhì)如果沒有采用補償裝置，在低露點測量時，有時會因鏡面上附著固體雜質(zhì)使測得的露點值偏高，這時應(yīng)該用脫脂棉蘸上無水乙醇或四氯化碳清洗鏡面。為了防止固體雜質(zhì)的干擾，儀器入口要設(shè)置過濾器，而過濾器對氣體中水分應(yīng)無吸附。如果被測氣體中有油污，在氣體進入測定室前應(yīng)該除去。以蒸氣形式存在的雜質(zhì)烴能在鏡面上冷凝，如果烴類露點低于水蒸氣露點，不會影響測定。在相反的情況下，會先于水蒸氣而結(jié)露，因此水蒸氣冷凝前必須分離出烴的冷凝物。如果被測氣體中含有甲醇，它將與水一起在鏡面上凝結(jié)，。這時得到的是甲醇和水的共同露點。冷壁效應(yīng)除鏡子外，儀器其余部分和管道的溫度應(yīng)高于氣體中水分露點至少2℃，否則，水蒸氣將在最冷點凝結(jié)，改變了氣體樣品中水分含量。降溫速度如果氣體樣品中水分含量較低，冷卻鏡子時應(yīng)盡可能的慢。因為這時冰的結(jié)晶過程比較緩慢，若以不適當(dāng)?shù)乃俣冉禍兀诒鶎由L和達到穩(wěn)定之前，還沒有觀察到出露，溫度已大大超過了露點，這就是過冷現(xiàn)象。通常肉眼能觀察到的露大約是10-5g/cm2,用靈敏的光電露點儀，可檢測出很低的水分含量。用目視露點儀測定較低的水分含量時，應(yīng)采取下述措施ta.接近露點時，冷卻鏡子的速度應(yīng)盡可能慢。b.使用放大鏡觀察露的出現(xiàn)。c.當(dāng)鏡子溫度慢慢地降低，露剛出現(xiàn)時測得的溫度與鏡子溫度慢慢上升而露消失時測得的溫度之平均值作為露點。7結(jié)果處理兩次露點測定結(jié)果的算術(shù)平均值為露點值，兩次露點溯定結(jié)果之差應(yīng)小于第8章中對重復(fù)性的規(guī)定。露點換算為ppm（V/V）按附錄A（補充件）中A.1計算或查表。露點換算為絕對濕度g/m3（20℃,101.3kPa下）按附錄A（補充件）中A.2計算或查表。8精密度露點低于-42℃時方法的精密度：重復(fù)性r=-0.93+0.041m再現(xiàn)性R=3.67+0.019m式中：m——測定結(jié)果的平均值。重復(fù)性和再現(xiàn)性的應(yīng)用按GB4471-84第4章中有關(guān)規(guī)定執(zhí)行。9報告報告應(yīng)包括下列內(nèi)容：a.分析日期、室溫、大氣壓b.取樣地點、編號、容器內(nèi)壓力c.樣品名稱d.分析結(jié)果：水分在樣品氣中的濃度e.測定時觀察到的任何異?，F(xiàn)象f.該標準中未包括的即自己選擇的其他操作g.分析員姓名附錄A(補充件)本附錄給出了氣體中水分露點-ppm(v/v)換算及露點一絕對濕度(s/m3)換算的式子和結(jié)果。A.1露點換算為ppm按下式計算。式中：P——出露溫度下冰的飽和蒸氣壓*，Pa。計算結(jié)果見表A1。A.2露點換算為g/m3(20℃，101.3kPa下)按下式計算。,.——二。!7M3」 (A2)10L3 22.41 293,1式中：p——出露溫度下冰的飽和蒸氣壓*，Pa。計算結(jié)果見表A2。表A1露點-ppm換算表

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