Types and Functions of Commonly Used Compressed Air Purification Equipment - Clean Room Related - Air Purification Equipment

Commonly used purification pharma machinery are: air storage tank, dryer (refrigerated and adsorption type), filter and so on. 1. Gas storage tank 1.1. The model of the gas storage tank, for example: C-0.3/8 'C' means the gas storage tank; '0.3' means the volume is 0.3 m3 (cubic); '8' means the maximum working pressure is 8 bar. 1.2. The role of the air storage tank: a. Store compressed air; b. Buffer pressure, because the pressure of the air discharged from the compressor fluctuates to a certain extent, after installing the air storage tank, the compressed air pressure at the gas end can be used more stable. c. Pre-water removal, part of the water vapor in the air has been compressed by the compressor to form liquid water droplets, most of these water droplets will be deposited at the bottom of the gas storage tank when passing through the gas storage tank. There is a drain valve at the bottom of the gas storage tank, which can pass through Manual or automatic discharge. 1.3. Selection of air storage tank: The pressure of the optional air storage tank should be consistent with the working pressure of the air compressor, and the volume is about 1/5-1/10 of the volume flow of the air compressor; if the environmental conditions allow, you can choose a larger one. The volumetric air tank helps to store more compressed air and better pre-water removal. 2. The dryer is divided into: refrigeration type, adsorption type (also known as heatless regeneration type), micro-heating type and combined type, etc. The commonly used is refrigerated dryer. 2.1. Model representation of refrigerated dryer, for example: DA-55 'DA' means refrigerated dryer; '55' means that the processing flow (purification flow) is 5.5 m3/min (cubic/min); 2.2. Refrigerated drying The role of the device: Because the compressed air contains 100% relative humidity water, as it cools in the pipeline, the water will be precipitated, which will bring many disadvantages to the gas pharma machinery. The refrigerated dryer is a drying pharma machinery that uses refrigeration technology to force the compressed air to cool to the required dew point temperature (2-10℃), thereby condensing the water vapor contained in it into droplets, which are discharged out of the machine by the drain. 2.3. Selection of refrigerated dryer specifications: The optional processing capacity is close to the volume flow of the air compressor, and the working pressure is equivalent to the working pressure of the air compressor. In some industries (times) that require high compressed air quality, it is not suitable to choose a refrigeration dryer, and an adsorption dryer or a combined dryer must be selected. 3. Function and selection of adsorption, micro-heating and combined dryers , When the compressed air enters the tower tank and contacts the desiccant, the compressed air is dried by the principle of pressure swing adsorption, and the dew point temperature can reach below -40. 3.2. The specification selection of the adsorption dryer is compatible with the specification selection of the refrigerated dryer. 4. Filter 4.1. The model of the filter, for example: SF18-** 'SF' means the filter; '18' means the processing flow (purification flow) is 1.8 m3/min (cubic/min); '**' Indicates the filtration accuracy grade; (see the table below for the filtration accuracy grade) 4.2. The function of the filter In addition to water, the compressed air also contains oil, dust and various peculiar odor components, and these compressed air pollutants are removed by physical filtering. The device is called a filter. a. Dust particle size of the filtered gas: The maximum diameter of the solid particles that the filter can pass under the specified experimental conditions, expressed in um (microns); b. Oil content of the filtered gas: The oil contained in a unit volume of compressed air ( Including the mass of oil droplets, suspended particles, and oil vapor), converted to the value under standard atmospheric conditions of absolute pressure of 1 bar, temperature of 20 °C and relative humidity of 65%. The residual oil content of compressed air after filtering is expressed in ppm, 1ppm≈1.2 mg/m3 (mg/cubic); 4.3. Filter selection The optional filter must be increased step by step in the order of filtration accuracy, and cannot be skipped The filter grade is directly matched with the following filter grade. For example, the P grade (pre-filtration) must be installed before the A grade (post filtration) can be installed, then the F grade (fine filter), AC grade (deodorant activated carbon) Filter), AD grade (sterilization filtration), in this order; The filter flow can be matched with the volume flow of the air compressor; you can also refer to the pressure correction coefficient in the table below for selection: Use under pressure other than 7bar , divide the volume flow of the air compressor by the correction factor in the table

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