As the second most important power source in modern industry, compressed air is widely used across almost all manufacturing sectors. However, it is well known that compressed air contains common impurities such as water, oil, and dust. Using untreated air can damage equipment and compromise production processes. How is compressed air purified? Typically, a system comprising an air receiver tank, filters, and a dryer is used to remove these impurities and supply clean compressed air for production.
Compressed air purification has become an essential step in manufacturing. In this system, filters—which generally operate on physical filtration principles—are used to remove oil and solid particulate impurities, while dryers are used to remove moisture.
Removing moisture has always been a challenging aspect of compressed air purification. The industry has evolved from the use of refrigerated dryers to the widespread adoption of adsorption dryers. While the importance of compressed air purification is increasingly recognized, the associated costs have also risen.
Refrigerated dryers can typically achieve a pressure dew point of -20°C, whereas adsorption dryers can reach -70°C, meeting the air quality standards for virtually all production applications.
So, which type of dryer and filter should be selected for compressed air purification?
Filters are essentially contaminant removal devices classified by their filtration capacity; the choice depends on specific operating conditions.
We know that air consumption and quality requirements vary from enterprise to enterprise. For general production, a pressure dew point of -20°C is often sufficient, making the cost-effective refrigerated dryer a suitable choice. However, industries such as painting, power generation, and instrumentation require much drier air, necessitating the use of adsorption dryers.
Purifying compressed air requires a comprehensive system to ensure a continuous supply of clean air to the enterprise. This approach maximizes cost-efficiency, optimizes production processes, and ensures equipment stability.