Screw air compressor itself with water removal device, generally at the outlet of the machine, can initially remove a part of water, into the post-treatment equipment in the water removal, oil removal and dust removal filter can remove a part of water, but most of the water mainly rely on drying equipment dryer to remove, so that the compressed air through it is dry and clean and then sent to the gas pipeline. The following combined with some actual analysis of the dryer after the compressed air water removal is not complete various reasons and solutions.

1. The cooling fins of the cooler of the air compressor are blocked by dust, etc. The compressed air is not well cooled and the pressure dew point is increased, which will make it more difficult to remove water from the post-treatment equipment. Especially in spring, the cooler of the air compressor is often blocked by catkins.

Solution: Install filter sponge on the window of air compressor station, and often blow soot on cooler to ensure good cooling of compressed air; Ensure normal water removal.

2. The water removal device of screw air compressor-steam-water separator is faulty. If all air compressors adopt cyclone separators, spiral baffles are added inside the cyclone separators to enhance the separation effect (and also increase the pressure drop). The disadvantage of this separator is that its separation efficiency is higher at its rated capacity, and once it deviates from its separation efficiency, it will be worse, resulting in an increase in dew point.

Solution: Check the air-water separator regularly, and deal with the faults such as blockage in time. If the air-water separator is found to be undrained in summer when the air humidity is high, check and deal with it immediately.

3. The amount of compressed air in the process is large, which exceeds the design range. The pressure difference between compressed air in the air compressor station and the user end is large, resulting in high airflow speed, short contact time between compressed air and adsorbent, uneven distribution in the dryer, and concentrated flow in the middle, which makes the adsorbent in the middle part saturated too quickly. The saturated adsorbent cannot effectively adsorb the moisture in the compressed air, and the compressed air carries a large amount of moisture through the center, resulting in "tunnel effect", resulting in a large amount of liquid water at the gas end.

In addition, in the process of transportation, compressed air expands to the low-pressure end of adsorption dry dispersion too fast, its pressure decreases rapidly, and at the same time, the temperature decreases greatly, which is lower than its pressure dew point. Water vapor precipitates in supersaturated state, and in winter, it will quickly solidify and hang ice on the inner wall of the transportation pipeline, and the hanging ice will become thicker and thicker, which may finally completely block the pipeline.

Solution: Increase the flow of compressed air. The excess instrument air can be added to the process air, and the instrument air is connected to the front end of the process air dryer and controlled by a valve, so as to solve the problem of insufficient supply of compressed air for process and the problem of "tunnel effect" caused by compressed air in the adsorption tower of the dryer.

4. The adsorption material used in the adsorption dryer is activated alumina. If it is not filled tightly, it will rub and collide with each other under the impact of strong compressed air, resulting in pulverization. The pulverization of adsorption material will make the gap of adsorbent bigger and bigger, and a large amount of compressed air will pass through the gap without effective treatment, which will eventually lead to the failure of the dryer. This problem is reflected in the field as a large amount of liquid water and slurry in the dust removal filter.

Solution: When filling activated alumina, fill it as tightly as possible, and check and supplement it after using it for a period of time.

5. Compressed air with oil leads to poisoning of activated alumina oil and failure. The supercoolant used in screw air compressor has high thermal conductivity, which is used to cool compressed air, but it is not completely separated from compressed air, which will make the compressed air sent out of air compressor bring oil, and the oil in compressed air will attach to the surface of activated alumina porcelain ball, blocking the capillary holes of activated alumina, causing activated alumina to lose its adsorption capacity and oil poisoning, and losing its moisture absorption function.

Solution: Replace the oil separator core regularly, post-oil removal filter core to ensure thorough oil-gas separation of air compressor, and post-oil removal filter to remove oil well. In addition, the supercoolant in the unit shall not be excessive.

6. The air humidity changes greatly, and the drainage frequency and time of each timing drain valve are not adjusted in time, so that the more accumulated water in each filter, the accumulated water can be brought into compressed air again.

Solution: The drainage frequency and time of timing drain valve can be set according to air humidity and experience. The air humidity is high, so the drainage frequency should be increased, and the drainage time should be increased at the same time. The adjustment standard is to observe that every time the accumulated water can be drained without draining compressed air. In addition, heat preservation and steam tracing are added to the conveying pipeline; Adding drain valve at the low point, checking and draining water regularly, can prevent freezing pipe in winter, remove part of moisture in compressed air, and reduce the influence of compressed air carrying water on users. By analyzing the causes of compressed air carrying water, the above corresponding measures are taken to solve it.