Air compressor Water content in the air

In the process of compressing air, the air itself contains moisture (i.e. humidity), and the water in the compressed air is analyzed and becomes a liquid, resulting in a certain amount of moisture in the compressed air. The following is a detailed analysis of the moisture content in the air in the air compressor: 1. Source of moisture content in the air

1. Natural humidity: The air always contains a certain amount of moisture, that is, humidity. When the air is compressed, due to the increase in pressure, water molecules in the air will more easily accumulate and precipitate into liquids.
2. Ambient Humidity: If the ambient humidity in which the air compressor is located is high, the moisture content in the air sucked into the air compressor will also increase accordingly, resulting in an increase in the moisture content in the compressed air.

2. Effect of moisture content in the air

1. Equipment damage: Excessive moisture will cause the equipment to rust, corrode, and even damage key components, shortening the service life of the equipment.
2. Decreased product quality: In production processes that require high-quality compressed air, excessive moisture may affect the quality and performance of the product. For example, in processes such as spray painting and spraying, excessive moisture will cause problems such as foaming and falling off of the coating.
3. Increased energy consumption: Excessive moisture will lead to a decrease in the working efficiency of the air compressor, thereby increasing energy consumption.

3. Standards and detection of moisture content in air

1. Standards: According to national standards or industry standards, the moisture content of compressed air under specific conditions is clearly stipulated. For example, in the standard GB/T3853-2018 “Technical Conditions of Air Compressors”, when compressed air is at 30°C, the saturated water content is 30 mg/m³ when the relative humidity is 100%. Under the standard gas volume, the mass flow rate of the open packaging shall not exceed about 0.1 mg/m³ of water. For air compressors used in a specific industry, they should also be tested according to the standards of that industry. In addition, under normal circumstances, the water content in the air compressor’s outlet gas should not exceed 80 ppm (the water content per cubic meter of gas should not exceed 80 mg).
2. Detection: To detect the water content in the air compressor’s outlet, dew point meter or capillary method is generally used. Among them, the dew point meter has a higher accuracy and can detect the water content of 0.001 ppm; while the capillary method has certain errors in detecting the water content, but it is easy to operate and can be considered for smaller air compressors.

IV. Methods to reduce the moisture content in the air

1. Installing a dryer: A dryer is a device specially designed to reduce the moisture content of air. By installing and using a dryer, moisture in the air can be effectively removed and the quality of compressed air can be improved.
2. regular maintenance: The air compressor needs maintenance and cleaning after use for a period of time to ensure its normal operation and smooth discharge of moisture. During the maintenance process, special attention should be paid to cleaning condenser and trachoma and other blocked components to avoid blockage of moisture and prevent it from being discharged smoothly.
3. Use automatic drainers: The automatic drainers can discharge condensate automatically and regularly, thereby effectively reducing the moisture content in the compressed air. The physical drain relies on the buoy force of the float in the drain to open the drain; while the electronic automatic drain is matched with the solenoid valve with an analog circuit solid-state electronic timer to achieve the timing and automatic discharge of condensed water in the compressed air system.

5. Precautions

1. Select the appropriate air compressor model: When choosing an air compressor, you should select the appropriate model and specifications according to actual needs and working conditions to ensure that it can meet the needs of the production line and reduce energy consumption.
2. Rational layout of pipelines: When laying out pipelines, try to avoid air leakage or water accumulation in the pipeline to reduce the moisture content in the compressed air.

In summary, an air compressor will produce a certain amount of moisture during the compressed air. In order to reduce the moisture content in the air and improve the quality of compressed air, a series of measures and methods are required for control and detection.