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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Pa4050.917368.624-121.81217.38243846.006618.708-141.52181.28523641.515935.392-161.27150.78243437.405314.68-181.06125.07483233.644483.512-200.888103.36323030.304238.42-220.73685.2482827.203776.22-240.59070.06322624.303357.972-260.50457.2762421.802981.016-280.41446.75322219.402641.356-300.34038.09522017.302336.33-320.27730.76921815.362061.936-340.22624.90841613.631815.516-360.18420.11321412.051597.068-380.14916.11721210.681401.264-400.12012.9204109.351226.77-420.09610.256488.281072.26-440.0778.125267.28933.732-460.0616.393646.39812.52-480.0495.061625.60704.628-500.0383.862804.85609.923-520.0303.0636-24.14516.816-540.0242.3976-43.52436.896-560.0181.8648-63.00368.298-580.0141.4652-82.54309.8232-600.0111.0656-102.14259.74-900.009320℃空氣的管道流導(dǎo)工程公工程公式長(zhǎng)管U1.34103d4pl短管1U短1U1U孔 管U4560Ka2b2flp矩形截面直管a/bKf環(huán)形管道U1340P[ddl(dd)212]12ln(d/d)1 2橢圓管道U42920la3b3pa2b2當(dāng)1x0.525時(shí),U76.6x0.7121x0.228A1x0孔x0.525時(shí),U200A1x0x0.1時(shí),U200A01.00.90.80.70.60.50.40.30.20.11.000.990.980.950.900.820.710.580.420.23、b 橢圓長(zhǎng)半軸,短半軸 mP 管道中平均壓力 PaA0x孔面積孔兩側(cè)壓力比m2符號(hào)U符號(hào)Udla意義20℃空氣流導(dǎo)管道直徑管道長(zhǎng)度m3/SmmU =12.1d3
1271(dP)4790(dP)2n.f.20℃
l 1316(dP)dmlmP:管道中平均壓力P=〔P1+P2〕/220℃空氣的管道流導(dǎo)《真空設(shè)計(jì)手冊(cè)》a10.9650.9310.870.7690.690.62546810204060801000.250.1820.1430.1170.06250.0320.020.001010.6670.5000.3330.2000.1250.1001.1081.1261.1511.1981.2971.4001.444l/b 0.10.20.40.81a>>b K 0.0360.0680.130.220.262 34510>100.40 0.520.600.670.941d)2d2/d100.2590.50.7070.8660.966Ka11.0721.1541.2541.4301.675工程公式圓長(zhǎng)管圓孔L/dU12.1d3工程公式圓長(zhǎng)管圓孔L/dU12.1d3lU9.11d20 0.05 0.10.20.40.60.8U9.11d2a圓短管1.00.57220.4正方形U15.45a3l矩形U30.9Ka2b2f(ab)lb/aKf等邊三角形U4.79a3l扁縫形U30.9Kbabl2b12.1K(dd)2(d環(huán)形a 121l橢圓形U136.6a2b21a b22l錐形U24.2d2d2(dd)l1 21 2直角彎管按直管計(jì)算,管道計(jì)算長(zhǎng)度lll 4d1 23縮孔U1 2d2d21 2l——管長(zhǎng)〔cm〕 A——面積〔cm2〕d——管道直徑〔cm〕材料物理性能組別
重度g/cm3
膨脹系數(shù)d×106
導(dǎo)熱系數(shù)秒.度
電阻系數(shù) 熔點(diǎn)Ω.mm2/m ℃T18.9T18.917.70.961083T28.920℃17.70.951080T48.8917.40.431080H908.818.20.40.039H808.6519.10.340.054H658.4720.10.2880.069H628.4320~100℃20.620~200℃0.260.071L62.712424.80.54658L42.712424.80.52LY112.82223.40.41ZL22.810.230.240.33~0.354.66~4.926ZL52.580.2450.2550.218.21ZL102.650.190.210.385.27~5.57ZL142.70.220.230.35~0.455.88~6.6710鋼7.8511.60.8080.13245鋼7.8111.590.5020.1321Cr18Ni97.90.0390.0420.1630.731Cr18Ni9Ti7.750.0390.0420.1630.73黃銅純鋁鑄鋁碳鋼不銹鋼GB5832.2-86適用范圍0℃~-70℃。原理術(shù)語說明水分露點(diǎn)——在恒定的壓力下,氣體中的水蒸氣到達(dá)飽和時(shí)的溫度。方法原理本法用露點(diǎn)儀進(jìn)展測(cè)定。地測(cè)量。當(dāng)氣體中的水蒸氣隨著鏡面溫度的漸漸降低而到達(dá)飽和時(shí),鏡面上開頭消滅露,此時(shí)所測(cè)量到的鏡面溫度即為露點(diǎn)。(由露點(diǎn)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。)儀器概述度的方法以及檢測(cè)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(cè)定室中。儀器的一般要求供給下述裝置、滿足根本要求的任何露點(diǎn)儀都可以使用。當(dāng)儀器溫度高于氣體中水分露點(diǎn)至少2℃時(shí),可以掌握氣體進(jìn)出儀器的流量。把流淌的樣品氣冷到足夠低的溫度,使得水蒸氣能分散,冷卻的速度可調(diào)。能觀看露的消滅和準(zhǔn)確地測(cè)量露點(diǎn)。氣路系統(tǒng)死體積小且氣密性好,露點(diǎn)室內(nèi)氣壓應(yīng)接近大氣壓力。用標(biāo)準(zhǔn)樣衡量?jī)x器是否符合要求,按GB4471-84《化工產(chǎn)品試驗(yàn)方法周密度室間試驗(yàn)重復(fù)性和再現(xiàn)性確實(shí)定》4.3目視和光電露點(diǎn)儀光電系統(tǒng)確定露生成的光電露點(diǎn)儀有相當(dāng)高的準(zhǔn)確度和周密度;用戶按需要和可能進(jìn)展選擇。露的觀看目視露點(diǎn)儀用肉眼觀看露的消滅。光電露點(diǎn)儀是承受裝在測(cè)定室的光源照耀鏡面,光源和光電池能以各種方式排列,從而產(chǎn)生光生電壓,給出出露信號(hào)。鏡面制冷方法3.5.13.5.2對(duì)自動(dòng)裝置,使用兩種方法制冷:3.5.33.5.4溶劑蒸發(fā)制冷用一種揮發(fā)性液體與鏡子反面接觸,用通入低壓空氣或其他壓縮氣體鼓泡的方法使液體氣化而制冷。絕熱膨脹法制冷40℃。液化氣體制冷80℃或更低的溫度。當(dāng)用液化氣體制冷時(shí),可以使和鏡子反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。該法也就是半導(dǎo)體制冷,承受多級(jí)串聯(lián)獲得不同的低溫。溫度測(cè)量銹鋼和銠合金。測(cè)量露點(diǎn)溫度,使用周密水銀溫度計(jì)、熱電偶、熱敏電阻或鉑電阻感溫元件。目前,高精度測(cè)量都承受鉑電阻感溫元件。分析前的預(yù)備試漏測(cè)試系統(tǒng)全部接頭處應(yīng)無泄漏,否則會(huì)由于空氣中水分的滲入而使測(cè)量結(jié)果偏高。簡(jiǎn)潔的試漏方法如下:u1000mmH2O5min5mm,說明系統(tǒng)氣密性良好。必要時(shí),應(yīng)上升壓力試漏。假設(shè)覺察系統(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)整閥,如針形閥。2m4mm1mm取樣閥的吹洗如此反復(fù)三次,再進(jìn)展測(cè)定。流量計(jì)的標(biāo)定應(yīng)針對(duì)不同氣樣,用皂膜流量計(jì)標(biāo)定樣品氣的測(cè)試流量。一般操作步驟-602h測(cè)定。調(diào)整樣品氣流量至規(guī)定范圍內(nèi)。5℃/min,對(duì)不知道露點(diǎn)范圈的樣品氣,可先進(jìn)展一次粗測(cè)。停機(jī)后,樣品氣的進(jìn)出口擰上密封螺母。留意事項(xiàng)干擾物質(zhì)概述I面上冷凝,使得所觀看到的露點(diǎn)不同于相應(yīng)的水蒸氣含量的露點(diǎn)。固體雜質(zhì)及油污假設(shè)固體雜質(zhì)確定不溶于水,它們就不會(huì)轉(zhuǎn)變露點(diǎn),但是會(huì)阻礙出露的觀看。在自動(dòng)裝置中,對(duì)固體雜質(zhì)假設(shè)沒有承受化碳清洗鏡面。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(duì)氣體中水分應(yīng)無吸附。假設(shè)被測(cè)氣體中有油污,在氣體進(jìn)入測(cè)定室前應(yīng)當(dāng)除去。以蒸氣形式存在的雜質(zhì)蒸氣冷凝前必需分別出烴的冷凝物。假設(shè)被測(cè)氣體中含有甲醇,它將與水一起在鏡面上分散,。這時(shí)得到的是甲醇和水的共同露點(diǎn)。冷壁效應(yīng)2℃,否則,水蒸氣將在最冷點(diǎn)分散,轉(zhuǎn)變了氣體樣品中水分含量。降溫速度溫,在冰層生長(zhǎng)和到達(dá)穩(wěn)定之前,還沒有觀看到出露,溫度已大大超過了露點(diǎn),這就是過冷現(xiàn)象。10-5g/cm2,用靈敏的光電露點(diǎn)儀,可檢測(cè)出很低的水分含量。ta.接近露點(diǎn)時(shí),冷卻鏡子的速度應(yīng)盡可能慢。b.使用放大鏡觀看露的消滅。c.當(dāng)鏡子溫度漸漸地降低,露剛消滅時(shí)測(cè)得的溫度與鏡子溫度漸漸上升而露消逝時(shí)測(cè)得的溫度之平均值作為露點(diǎn)。結(jié)果處理兩次露點(diǎn)測(cè)定結(jié)果的算術(shù)平均值為露點(diǎn)值,兩次露點(diǎn)溯定結(jié)果之差應(yīng)小于第8章中對(duì)重復(fù)性的規(guī)定。ppm(V/V)按附錄AA.1g/3(20℃,101.3kPaAA.2周密度露點(diǎn)低于-42℃時(shí)方法的周密度:r=-0.93+0.041m再現(xiàn)性R=3.67+0.019m式中:m——測(cè)定結(jié)果的平均值。GB4471-84第4報(bào)告報(bào)告應(yīng)包括以下內(nèi)容:分析日期、室溫、大氣壓c.樣品名稱d.分析結(jié)果:水分在樣品氣中的濃度e.測(cè)定時(shí)觀看到的任何特別現(xiàn)象f.該標(biāo)準(zhǔn)中未包括的即自己選擇的其他操作g.分析員姓名A(補(bǔ)充件)本附錄給出了氣體中水分露點(diǎn)-ppm(v/v(s/m)換算的式子和結(jié)果。ppm式中:P——出露溫度下冰的飽和蒸氣壓*,Pa。A1。g/3(20℃101.3kPa式中:p——出露溫度下冰的飽和蒸氣壓*,Pa。A2。A1露點(diǎn)-ppm露點(diǎn),℃露點(diǎn),℃0.O0.10.20.30.4ppm0.50.60.70.80.9O6033598359345885583757895741569456475600-15554550854635418537253285283524051965153-25111506850264983494249004860481947794738-34699465946214581454345054467442943924355-44318428142464209417441744104406940354000-53965393238983865383238003767373437033671-63640360835773547351634863456342633973367-73339330932083253322431963169314131143087-83060303430072980295539292903287828522827-92803277827532730270626812658263526112588-1O2566254325202498247624542432241123892367-112346232623052284226422442224220321842165-122145212521072088206920502032202319951977-131960194219241906188918731855183818211805-141789177217561740172517091693167716611647-151632161716011587157315581543152915151501-161487147314601446143214201406139313801367-171354134213∞1317130512921280126912571245-181233122112091198118711761165115411431132-191121111111001090107910691059104810381029-20101910091000990.1981.O971.6962.3953.O943.9934.3-21925.9916.9908.1899.389O.6882.O873.4.865.1856.7848.4-22840.2832.O823.9815.9807.9800.1792.3784.6776.9769.3-23761.8754.3747.O739.6732.4725.2718.1711.0703.9697.0-24690.2683.4676.6670.O663.4656.8650.2643.8637.4631.1-25624.9618.7612.4606.4600.3594.4588.5582.5576.7570.9-26565.3559.5553.9548.4542.8537.4532.O526.7521.3516.1-27510.9505.7500.6495.6490.5485.5480.6475.7470.9466.0-28461.3456.7452.O447.4442.8438.3433.8429.3425.O420.6-29416.3412.O407.8403.6399.4395.3391.2387.2383.2379.3-30375.3371.5367.6363.8360.O356.3352.5348.9345.2341.7-31338.1334.6331.1327.5324.2320.7317.4314.1310.8307.5-32304.2301.1297.9294.8291.6288.5285.5282.5279.5276.5-33273.6270.7267.8265.0262.2259.3256.6253.9251.1218.5-34245.8243.1240.6238.0235.4232.9230.4227.9225.5223.O-35220.6218.3255.9213.5211.3209.O2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