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1、冷凍式干燥機(jī)選型指南?如何選擇冷干機(jī)????正確地選擇一臺冷干燥機(jī)，必須同時考慮到壓縮空氣的實際流量、壓力、溫度又上及環(huán)境溫度和要求的壓力露點(diǎn)溫度五大因素。?冷干機(jī)處理量Qs=Qa×C1×C2公式中Qa為壓縮空氣實際流量???舉例：冷干機(jī)入口空氣壓力為0.7MPa，冷干機(jī)入口空氣溫度為40℃，環(huán)境溫度40℃，壓縮空氣的實際流量Qa10Nm3/min，要求壓力露點(diǎn)+2℃則：冷干機(jī)處理量Qs=Qa×C1×C2，查表一、表二，C1=0.80，C2=1.22,得QS=9.76，應(yīng)選擇SLAD-10NF規(guī)格最合適。?表一壓縮空氣壓力及溫度修正系數(shù)（C1）入口
2、溫度℃進(jìn)口壓力(MPa)0.40.50.60.70.80.91.0250.490.430.400.370.350.330.32300.570.500.460.420.400.370.36350.840.770.710.650.620.590.57400.990.910.850.800.770.740.72451.201.111.0510.970.940.92501.371.301.241.181.141.101.07??表二環(huán)境溫度與壓力露點(diǎn)修正系數(shù)（C2）?環(huán)境溫度℃壓力露點(diǎn)2℃10℃250.650.34300.780.463510.66401.
3、220.86??壓力露點(diǎn)－大氣露點(diǎn)換算圖??大氣露點(diǎn)－水分含量關(guān)系表露點(diǎn)℃水份含量g/m3露點(diǎn)℃水份含量g/m3露點(diǎn)℃水份含量g/m3露點(diǎn)℃水份含量g/m3露點(diǎn)℃水份含量g/m364153.83948.671412.07-112.186-360.259763147.33846.621311.35-122.206-370.235962141.23743.961210.66-131.876-380.214161135.33641.751110.01-141.736-390.194060130.33539.63109.309-151.605-400.17
4、5759127.73437.6198.819-161.483-410.159058119.43335.6888.270-171.369-420.143857114.23233.8377.750-181.261-430.129856109.23132.0767.260-191.165-440.117255104.43030.3856.797-201.074-450.10555499.832928.7846.360-210.9884-460.095015395.392827.2435.947-220.9093-470.085445291.122725.
5、7825.559-230.8359-480.076755187.012624.3815.192-240.7678-490.068865083.062523.05-04.847-250.7047-500.061714979.262421.78-14.523-260.6463-51.10.0544875.612320.58-24.217-270.5922-53.90.0404772.102219.43-33.930-280.5422-56.70.0294668.732118.34-43.660-290.4960-59.40.0214565.502017
6、.30-53.407-300.4534-62.20.0144462.391916.31-63.169-310.4141-65.00.0114359.411815.37-72.946-320.3779-67.80.0084256.561714.48-82.737-330.3445-70.60.0054153.821613.63-92.541-340.3138-73.30.0034051.191512.83-102.358-350.2856????流程圖??1、換熱器2、蒸發(fā)器3、氣液分離器???????4、自動排水器5、冷媒壓縮機(jī)???????6、汽
7、化器7、分液頭8、氣液混合頭9、熱力膨脹閥?????10、視鏡11、干燥過濾器?????12、儲液器13、熱氣旁通閥?????14、冷凝器（風(fēng)冷）15、冷凝器（水冷）??16、預(yù)冷器（水冷）17、預(yù)冷器（風(fēng)冷）?????冷干機(jī)原理冷干機(jī)是根據(jù)冷凍除濕原理，將壓縮空氣強(qiáng)制通過蒸發(fā)器進(jìn)行熱交換而降溫，使壓縮空氣中氣態(tài)的水和油經(jīng)過等壓冷卻，凝結(jié)成液態(tài)的水和油，并夾帶塵埃，通過自動排水器排出系統(tǒng)外，從而獲得清潔的壓縮空氣。一、為何使用壓縮空氣干燥機(jī)環(huán)境空氣中含有水分，當(dāng)空氣被壓縮機(jī)吸入、壓縮后，盡管體積減小了，但其所含有的水分絕對數(shù)量并沒有減少。因此壓縮空
8、氣中水分的濃度增大了，并且在壓縮過程中會產(chǎn)生冷凝水。舉例來說，一臺排氣壓力為7公斤的壓縮機(jī)，能夠?qū)?立方米的體積的空氣壓縮
