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Air volume correction during dryer selection
Selection correction
If there is a deviation between the actual working conditions and the design conditions of the data, the correction coefficient should be selected according to the actual corresponding working conditions to make corresponding corrections, so as to select the dryer with the appropriate processing capacity.
Refrigeration dryer selection correction
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入口溫度修正系數(shù) |
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|
入口溫度 ℃ |
標準N型 |
25 |
30 |
35 |
40 |
41 |
42 |
45 |
|
高溫H型 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
|
|
修正系數(shù) A |
1.15 |
1.10 |
1.05 |
1.00 |
0.97 |
0.93 |
0.85 |
|
|
使用壓力修正系數(shù) |
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|
使用壓力 MPa |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
|
|
修正系數(shù) B |
0.80 |
0.88 |
0.92 |
1.00 |
1.05 |
1.12 |
1.25 |
|
|
環(huán)境溫度修正系數(shù) |
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|
環(huán)境溫度 ℃ |
風冷型 |
25 |
30 |
32 |
35 |
38 |
40 |
|
|
修正系數(shù) C |
1.20 |
1.15 |
1.10 |
1.05 |
1.00 |
0.90 |
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|
冷卻水溫度 ℃ |
水冷型 |
30 |
32 |
34 |
|
|
|
|
|
修正系數(shù) C |
1.00 |
0.97 |
0.94 |
|
|
|
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壓力露點修正系數(shù) |
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|
露點要求 ℃ |
0 |
2 |
5 |
7 |
10 |
|||
|
修正系數(shù) D |
0.90 |
1.00 |
1.10 |
1.15 |
1.20 |
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冷凍式干燥機選型應滿足的處理量=進氣流量÷（A×B×C×D） 例如：進氣流量為45m3/min，入口溫度為65℃，使用壓力為1.0MPa，環(huán)境溫度40℃，壓力露點要求為2℃選風冷高溫型冷干機 所選冷凍式干燥機應滿足的處理=45m3/min÷（1.00×1.25×0.90×1.00）≈40m3/min，則，應該選擇處理量不小于40m3/min之相應冷凍式干燥機，(水冷型選型方法相同) |
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吸附式干燥機選型修正
|
入口溫度修正系數(shù) |
||||||||||
|
入口溫度 ℃ |
25 |
30 |
35 |
40 |
45 |
50 |
||||
|
修正系數(shù) A |
1.00 |
1.00 |
1.00 |
0.97 |
0.88 |
0.73 |
||||
|
使用壓力修正系數(shù) |
||||||||||
|
使用壓力 MPa |
0.44 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
1.1 |
1.2 |
1.3 |
|
修正系數(shù) B |
0.63 |
0.75 |
0.88 |
1.00 |
1.13 |
1.25 |
1.38 |
1.50 |
1.6.3 |
1.75 |
|
壓力露點修正系數(shù) |
||||||||||
|
露點要求 ℃ |
-20 |
-40 |
-60 |
-70 |
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|
修正系數(shù) |
1.10 |
1.00 |
0.85 |
0.70 |
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吸附式干燥機選型應滿足的流量=進氣流量÷（A×B×C） 例如：進氣流量為23m3/min,入口溫度為40℃，使用壓力為0.6MPa，要求壓力露點-40℃ 所以吸附式干燥機應滿足的處理量=23÷（0.97×0.88×1.00）≈27m3/min，則應該選擇處理量不小于27m3/min之相應吸附式干燥機 |
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國際標準壓縮空氣質(zhì)量等級ISO8573-1
|
等級 |
顆粒 |
水 |
油 |
|
粒徑（ um ） |
壓力露點 ℃ |
更大含量mg/m3（ppm） |
|
|
1 |
0.1 |
-70 |
0.01(0.008) |
|
2 |
1 |
-40 |
0.1(0.08) |
|
3 |
5 |
-20 |
1(0.83) |
|
4 |
15 |
3 |
5(4.2) |
|
5 |
40 |
7 |
25(21) |
● Select the purification system based on the rated air pressure and pressure of the air compressor.
● Select the dryer model based on the intake air temperature, rated air volume, rated pressure and ambient temperature.
● Based on the dryness, that is, the dew point value, choose which type of dryer to configure.
● According to the level of oil content index and dust content index, choose to configure several stages of filtration, and confirm the type of filter.
● Confirm the configuration of the pipeline and the material of the pipeline according to the indicators of dew point, oil content and dust content.
● In the workplace with a large amount of environmental dust, install a self-cleaning filter to protect the air compressor and ensure the purification effect.
● The process of drying and purifying compressed air is mainly a process of drying and filtering, and it is also a process of decreasing temperature. Temperature plays an important role in purification, and both the intake air temperature and the ambient temperature directly affect the drying and purification effects.
● In the whole compressed air system, the setting of the air storage tank also plays an important role. Because the air storage tank has the functions of stabilizing the airflow, cooling, discharging and storing the gas, the air storage tank should be installed between the compressed air and the drying and purification equipment, and between the drying and purification equipment and the terminal gas point.
● It is necessary to systematically add waste oil collectors to collect the oil and discharge the water that meets the environmental protection requirements directly into the river.
Hidden Hazards in Untreated Compressed Air
Compressed air is an important power that is widely used in various fields of industry. When the air around us is compressed, the amount of water vapor and dust contained in a unit volume rises dramatically. At the same time, the compression process causes water vapor and oil mist in the air to condense into small droplets, which are then mixed with high-concentration dust to form mostly acidic sludge. Without compressed air reprocessing equipment, these acid sludges will enter the air pipeline, corrode pipeline materials, damage start-up tools and equipment, and ultimately lead to product quality degradation, production stagnation, increased maintenance costs, and health and safety threats.
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