Compressed air has become an indispensable power source in human production and life. With the continuous development of modern industry, the requirements for compressed air quality are getting higher and higher. The quality of compressed air is mainly determined by the pressure dew point. The lower the dew point value, the better the compressed air quality. Due to the differences in production processes in different industries, the dew point requirements of compressed air are different. For example, the pressure dew point of electroplating, food, pharmaceutical and other industries generally requires -20°C; the pressure dew point of chemical and electric instruments generally requires- Below 40℃, the pressure dew point of the compressed air of the semiconductor chip factory is required to be around -70℃.
Reasons for the Air Dryer’s Unstable Performance
Since most companies do not know that poor quality of compressed air will bring great harm to production, most manufacturers still use refrigerated dryers, and the pressure dew point is generally around 10°C, which cannot meet production requirements.
As we all know, at a certain temperature, the amount of water vapor contained in moist air has a maximum limit. If this limit is exceeded, excess water vapor will condense from the moist air. This moist air contains the maximum amount of water vapor. It is called saturated air. In fact, the saturated moisture content of humid air will increase or decrease as the air temperature rises and falls. If the saturated air continues to be cooled, condensed water will be generated. The temperature corresponding to when the air finally reaches saturation is whether the air is condensed or not. The critical temperature is called dew point temperature, and the dew point temperature corresponding to a certain pressure is called pressure dew point.
The refrigeration dryer we use is based on the physical properties of the wet air, using refrigeration technology to forcibly cool the compressed air below the required dew point temperature, so as to condense the water vapor and oil mist contained in it into droplets, which are discharged by the automatic drainer. outside. In fact, there are very few refrigerated dryers that can meet the standards of the compressed air industry for enterprise products, and one of the reasons for the failure to meet the standards is the filling problem of the refrigerant.
If there is too little refrigerant infusion, these phenomena will occur in the refrigerant air dryer:
- The evaporation pressure and condensing pressure are lower than normal operation, but the air dew point cannot be lowered;
- The compressor shell is hot. If the refrigerant is poured too much, the refrigeration dryer will appear: The condensation area is reduced due to the accumulation of refrigerant liquid in the condenser, resulting in an increase in the condensing pressure, and high pressure tripping in severe cases;
- The load of the refrigeration compressor increases and it is difficult to start
- The refrigerant fails to fully vaporize in the evaporator, causing the wet vapor to enter the compressor, and there is a risk of “liquid compression”;
- The cooling capacity of the compressor decreases due to the increase in condensation pressure, and the air dew point rises. It can be seen that the filling of refrigerant is not easy, and there is no intuitive filling display, which will make filling more difficult. This is also one of the reasons why 95% of the companies on the market do not meet the standards for compressed air.
Analysis of the reasons for the unstable performance of the dryer
The latest mold core technology on the market solves this problem well. The air dryer we selected adopts the latest mold core adsorption technology. The adsorption stage is that wet compressed air enters the air inlet buffer cavity from the inlet, and evenly passes through each mold core adsorption cavity from bottom to top; Molecular sieve uses its own capillary action to absorb moisture in compressed air to achieve a drying effect. The regeneration stage includes non-thermal regeneration and micro-thermal regeneration. The non-thermal regeneration is the regeneration dry air that enters the regeneration group outlet buffer cavity through the regeneration airflow regulating valve. After the dry gas expands and depressurizes to atmospheric pressure in the regeneration group mold core adsorption cavity, it flows from above. Next, the molecular sieve of the regeneration group is purged, the moisture in the adsorbent body is separated from the adsorbent, resolved in the dry air, and discharged from the muffler together with the regeneration gas; the micro-heat regeneration is the regeneration dry air after being heated in the outlet buffer chamber, and then enters the regeneration In the adsorption cavity of the mold core, the moisture in the adsorbent accelerates the analysis speed in a high temperature environment, which greatly reduces the regeneration purge air volume.
The core filler of the dryer is a special carbon molecular sieve from Baiteng. The molecular sieve has a sieve-type dispersive convection design, reasonable distribution of air sources, elimination of dead spots in adsorption, and effective use of all adsorbents, which not only reduces the amount of adsorbents, but also maximizes Played the adsorption role of molecular sieve.
Reasons for the Unstable Performance of the Compressor’s Air Dryer
The filling of the adsorbent is more compact and uniform, avoiding the hazards of “channeling short-circuit phenomenon” and “tunneling effect”, and the replacement operation has become easier and more convenient. At the same time, the design of the adsorption core makes it possible to increase the effective adsorption area by increasing the number of cores without increasing the height of the equipment to achieve the ideal pressure dew point, thereby reducing the pressure loss of the equipment.
Factors affecting the drying effect of plastic desiccant dryers
Although the drying of the plastic particles by the dehumidifying dryer is a relatively simple process, in some cases, the particles cannot be completely dried. The factors that affect the drying effect of dehumidifying dryers are as follows:
What factors will affect the drying effect of plastic desiccant dryers?
1. Dew point:
In the plastic desiccant dryer, the humid air is first removed to make it contain very low residual moisture (dew point). Then, heat the air to reduce its relative humidity. At this time, the vapor pressure of dry air is lower. By heating, the water molecules inside the particles get rid of the binding force and diffuse to the air around the particles.
2. Drying temperature:
Heat is the key to unlock the force between the water molecules and the hygroscopic polymer. When the temperature is higher than a certain temperature, the attractive force between the water molecules and the polymer chains will be greatly reduced, and the water vapor will be taken away by the dry air.
The dry hot air transfers heat to the particles in the drying silo, removes moisture on the surface of the particles, and then sends the moisture back to the plastic dryer. Therefore, there must be enough airflow to heat the resin to the drying temperature and maintain this temperature for a certain period of time.
In the air around the particles, it takes a certain time for the absorption of heat and the diffusion of water molecules to the surface of the particles. Therefore, the resin supplier should specify the time it takes for a material to be effectively dried at the appropriate temperature and dew point.
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