The following is an example of an adsorption dryer with a gas volume of 6 m3/min and a working pressure of 08 MPa. The assumption is as follows: atmospheric pressure P1 = 01 MPa (absolute pressure), and the gas volume of the dryer is V1 = 6 m3 / min. Gas temperature T1=293K, design pressure P=09MPa, dryer inlet air temperature T=311K.
The table can be seen that the water content saturation density X38=004628kg/m3 at the inlet state of the dryer, the water content saturation density X-40=000012kg/m3 at the outlet state of the dryer, and the water content saturation density X20=00172kg/ under the standard state of the compressor inlet. M3.
Since the compressor suction standard state is temperature 20 and the relative humidity is generally 65%, the moisture sucked by the compressor is: M=6X2065%=00671kg/min. According to the test specification of GB10893 compressed air dryer, the inlet state of the dryer is fixed. 38, the relative humidity is saturated, then the moisture that the dryer needs to remove is: M0=V(X38-X-40) where the air flow rate in the V compression state is V=P1V1TPT1=01631109293=0708m3/min, so M0=0708( 004628-000012)=00327kg/min Normally, the adsorption dose required for the adsorption dryer (in the case of a heat-free regenerative dryer) is calculated as: Q=G0/ where the adsorbent spare coefficient is taken, and 15 adsorbent adsorption capacity is taken. Take 03% G0 half cycle (5min) single tower water absorption, G0=5M0, then Q=5003271503%=825kg This is the acceptable adsorption dose of the manufacturer, which is also common to us.
It can be seen that the moisture removed by the adsorption dryer accounts for 00327/00671=49% of the moisture absorbed by the compressor. If the moisture is completely removed by the dryer alone, the volume (adsorption dose) will be more than doubled. I. If the environment in which the compressor is inhaled is worse than the standard state (the operating conditions of many domestic air compressor rooms are relatively poor), then the compressor draws more water and the dryer is more difficult to handle. These conditions indicate that in the intermediate link between the compressor and the adsorption dryer (including the aftercooler, the gas storage tank and the filter), it is necessary to remove more than 1/2 of the water, relying solely on the aftercooler and the gas storage. It is unreliable for the can to remove this moisture. In practical applications, we have found that a large part of the adsorption dryer without a pre-filter has incomplete regeneration due to excessive moisture absorption, so the drying effect is reduced, and the adsorption service life is greatly shortened. Pre-filter (or water separator) is necessary to remove water.
The importance of front degreasing is usually the same. The manufacturer's requirements for the desiccant replacement cycle of the dryer are 35 years, except for holidays, equipment maintenance, etc., such as 350 days of work per year, 24 hours per day, according to the minimum requirements of 3 years, before the replacement of adsorbents. The working time is 25200h. The adsorption dryer is a double-tower rotation operation, that is, when one tower is adsorbed, the other tower is desorbed. Therefore, the actual working time of each tower adsorbent is 12600h. Most of the oil entering the drying tower is due to It is deposited in the body of the adsorbent. That is to say, to maintain the normal life of the adsorbent, the oil accumulated in the drying tower should not exceed one quantification within 12600 h. The following is a 6 m3/min drier. Calculation.
When designing the dryer, each manufacturer usually needs to consider the retention factor of the insurance factor and the multiple regeneration of the adsorbent in addition to the adsorbent required for normal work. The ratio of the actual adsorbed dose to the adsorbed dose required for normal work is called The reserve factor, the reserve factor is generally 1520, where =15, then, to maintain normal working conditions, within 12600h, the adsorbent contaminated by oil should be (15-1) / 15100% = 333%, the density of oil = 09t / M3, the porosity of alumina is 50%, and the specific gravity of alumina is 750kg/m3, then the weight of accumulated oil should be: XV tower 333% 50% 091000=825750333% 50% 091000=165kg compressed air entering the dryer The oil content should be: AX66012600=36mg/m3 Due to the different oil content of various compressors, but the oil-free lubricating compressor, the gas content of the gas is mostly around 10mg/m3, and many models are more than 10mg/m3. With the pre-oil filter, according to the above calculations, the life of the adsorbent will be reduced, resulting in a shortened normal life cycle of the adsorption dryer, and the consequences are also very serious.
Conclusion At present, adsorption dryers have been widely used. Correct understanding of pre-filters to reduce the moisture and oil entering the adsorption dryer can help us rationally configure the purification air system and improve the technical and economic benefits of the system. In today's international market, foreign famous brands have many filters, and the technology is relatively mature, while domestic filters are mostly relatively rough. Therefore, attention should be paid to the research and development of filters.
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