Catalytic oxidation degreasing | Sharing of compressed air degreasing technology

Compressed air is the second largest source of power other than electricity. It is widely used in various industries as an inexpensive power. Compressed air is usually generated by an electric drive compressor that produces work on the intake air and is a clean energy source. However, most of the compressors currently use lubricating oil, which inevitably contains oily impurities in the compressed air. The main components are hydrocarbon hydrocarbons, which affect the use of compressed air in subsequent processes. Therefore, the oil content in compressed air is one of the important indicators in its quality standards.

At present, there are few reliable methods for decompressing compressed air. The compressed air degreasing method has been reported to use a special degreasing component to physically remove oil. This method has a good effect on removing oil droplets and oil mist in compressed air, but it is basically impossible to remove molecular oil (hydrocarbons) in compressed air. Therefore, it is difficult to achieve oil-free levels by physically treating oil-containing compressed air.

According to the standard GB/T 13277.1-2008 (ISO 8573-1 eqv.) "Compressed air first part: pollutant purification level" compressed air oil content index, the total oil content in compressed air is specified as liquid oil, suspension oil, oil The sum of the three parts of the vapor.

At present, the following effective ways are commonly used to treat oil impurities in the air.

(1) Adopt the method of cooling + filtering. It mainly utilizes the difference of saturated vapor pressure of oil at different pressures under a certain pressure, so that the phase transition from oil vapor to oil mist occurs, and the small particle oil mist agglomerates into large particle oil mist transition at low temperature.

(2) Activated carbon filtration. By using the large specific surface area of the activated carbon, the oil impurities in the compressed air are removed by adsorption.

        (3) Catalytic oxidation and degreasing. Compressed air at a certain temperature, in which the oil molecules and the oxygen molecules in the compressed air undergo catalytic oxidation reaction on the surface of the oxidation catalyst, so that it is completely converted into carbon dioxide and water. Since the oxygen content in the compressed air is much greater than the oil content, the key to the process is to provide a rapid reaction and suitable conditions for the conversion of oil and oxygen.