Detailed explanation of compressed air post-processing equipment

Detailed explanation of compressed air post-processing equipment

Compressed air post-processing equipment refers to a complete set of equipment filtration and drying equipment developed to remove small solid particles, large amounts of water and oil contained in compressed air through an air compressor, including compressed air storage tanks, compressed air filters ( High-efficiency degreaser, precision filter), compressed air dryer (refrigeration dryer, adsorption dryer), compressed air rear cooler, etc.

　　 compressed air tank

　　 1. The role of the gas storage tank:

　　A. Store compressed air;

　　B. Buffer pressure, because the compressor discharge air pressure fluctuates to a certain extent, after installing the air storage tank, the compressed air pressure at the air end can be more stable.

c. Pre-dewatering. Part of the water vapor in the air has been compressed by the compressor to form liquid droplets. Most of these droplets will be deposited on the bottom of the gas storage tank when they pass through the gas storage tank. There is a drain valve at the bottom of the gas storage tank, which can be passed Manual or automatic discharge.

2. Selection of air storage tank: The pressure of the selected 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 permit, you can choose large The volume of the air storage tank helps to store more compressed air and better pre-dewater.

　　 compressed air filter

　　 1. The role of the filter: In addition to water, compressed air contains oil, dust and various odor components. The equipment that physically filters and removes these compressed air pollutants is called a filter.

2. Filter selection: The optional filter must be increased step by step in the order of the filtering accuracy level. The previous filtering level cannot be skipped and the subsequent filtering level must be directly selected, for example: P level (pre-filtering) must be installed first, Only then can it be installed with grade A (post-filtering), then grade F (fine filter), grade AC (deodorizing activated carbon filter), grade AD (sterilizing filter), in this order; filter flow selection and air pressure The volume flow of the machine is equivalent.

　　 compressed air dryer

　　1. The function of the refrigerated dryer: Because the compressed air contains 100% relative humidity moisture, as it cools in the pipeline, the moisture will precipitate, which will bring many disadvantages to the gas equipment. The refrigerated dryer is a drying device that uses refrigeration technology to forcibly cool compressed air to the required dew point temperature (2-10°C), thereby condensing the water vapor contained in it into droplets, which are discharged out of the machine by a drain.

　　2. Optional refrigeration 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 (hours) that require high compressed air quality, it is not suitable to choose a refrigerated dryer, and an adsorption dryer or a combined dryer must be selected.

3. The adsorption dryer adopts the principle of pressure swing adsorption and adopts a double-chamber structure. The adsorption chamber contains a certain amount of desiccant (alumina). When compressed air enters the adsorption chamber and contacts the desiccant, the pressure swing is used The principle of adsorption is to dry compressed air, and the dew point temperature can reach below -40.

　　4. The specifications of the adsorption dryer are similar to those of the refrigerated dryer.

　　 compressed air rear cooler

　　1. The role of the cooler: When the exhaust temperature of the air compressor is high (over 80°C), the compressed air contains a lot of water and oil, which exceeds the operating conditions of the subsequent purification equipment, so it must be cooled and water removed.

2. The principle of the cooler: a device that uses a heat exchanger to process high-temperature compressed air into low-temperature dry air. After the compressed air containing a large amount of saturated water vapor from the pipe network is cooled, the obtained low-temperature compressed air enters the freeze drying Most of the water vapor in the freeze dryer is condensed into liquid droplets, which are removed after gas-water separation, which can meet the needs of most air separation industries. Pre-coolers have become the first choice for purification equipment in air compressor stations in the air separation industry due to their reliable work, convenient management and low operating costs.