1: Features and Benefits:
Complies with REACH Standard for food packaging; Embedded braid prevents material entrapment, ensures easy cleaning; Easy to bend into place; Flexible; permits tight clamping for leakproof connections; Maximum working pressure clearly printed on tubing; Clear tubing allows full visual flow monitoring
Transfer lines; Higher-pressure applications, including lab, food and beverage use; Pneumatic circuitry; Cell culture; Use with insert / barbed fittings; NOT recommended for vacuum applications
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The rated conditions of the adsorption type compressed air dryer (including RSXW type and RSXJ type) are as follows:
Inlet pressure: 0.7MPa(g)
Inlet temperature: 40°C (saturated humid air)
Ambient temperature: 38°C Pressure dew point: -40°C
Regeneration gas volume: 14% (no heat regeneration), 7% (microthermal regeneration)
When the suction dryer is operated under the specified working conditions, its efficiency will be maximized. As long as the user selects an appropriate matching dryer according to his own processing gas volume and demand, he can obtain the required quality of dry air. However, if the operating conditions are far from the rated conditions and no corresponding measures are taken, the normal operation of the equipment will be affected and the work efficiency will be reduced. In severe cases, the required quality product gas will not be obtained and the service life of the equipment will be affected. From the following aspects, we will analyze the factors that have a great impact on the normal operation of the dryer:
(A) Intake air temperature The compressed air entering the dryer is saturated air with a certain temperature. As can be seen from 3.2: under the same pressure conditions, the temperature increases by 5°C, the saturated moisture content increases by about 30%, which means that the humidity load entering the dryer increases by about 30%; in addition, the adsorption capacity of the adsorbent varies with temperature. When it rises and decreases (see Figure 2-24), the dryer's drying efficiency decreases as the inlet temperature of the compressed air increases. According to the analysis of the experimental results, the dew point of the product gas outlet will increase by 8~10°C for every 5°C increase in the inlet air temperature. Therefore, reducing the intake air temperature as much as possible is beneficial to the dryer.
(II) Working pressure Working pressure exerts a great influence on the operation of the dryer, which is embodied in the following four aspects:
1) As discussed earlier, the lower the compressed air pressure, the greater the amount of regeneration gas. We can also see from Table 4-4 that the saturated water content of compressed air is inversely proportional to the pressure, that is, the lower the working pressure is, the greater the humidity load of the dryer is, and therefore the amount of regeneration gas required is also large.
2) From the dryer structure we know that the regeneration air is determined by the opening of the orifice plate or ball valve and the pressure difference between the two sides. When the circulation area is constant, the amount of regeneration gas flowing through the orifice plate (5) or the ball valve is proportional to the pressure. The decrease of the working pressure will lead to a decrease in the amount of regeneration gas and thus decrease the regeneration efficiency of the suction dryer and affect the adsorption efficiency.
3) The volume of the compressed air is inversely proportional to the pressure. The lower working pressure will increase the flow velocity of the compressed air, and the contact time between the adsorbent and the compressed air will shorten, leading to a decrease in the dynamic adsorption capacity.
4) As can be seen from Figure 2-29, the pressure loss of the adsorbent bed increases due to the pressure drop and the increase in the velocity of the empty column. Therefore, the lowering of the working pressure will inevitably cause the dew point of the product gas outlet to rise, the amount of regeneration gas to increase, and the pressure drop to rise. Especially non-thermal regenerative dryers are very sensitive to pressure drop. Therefore, RSXW type non-thermal regeneration dryers all require the lower limit of the working pressure: no less than 0.5MPa (except specially designed dryers). In addition to the pressure drop, which reduces the operating efficiency of the dryer, there is a large range of pressure fluctuations that can affect the normal operation of the equipment. This is especially the case with piston-type air compressors. Of course, pressure fluctuations can also occur when the demand for gas changes greatly in some situations. In this case, a suitable buffer tank at the front of the dryer or a pressure maintenance valve in the system should be installed to ensure that the dryer operates as much as possible under stable conditions.
(c) Condensate Compressed air discharged from the cooler at the rear of the compressor is a type of supersaturated compressed air containing a certain amount of condensed water. A small amount of condensate has little effect on the dryer, because the bottom of the adsorption tower of our dryer is filled with water-resistant ceramic balls or alumina (without activation), but no water separator is installed before the dryer. With the filter or a large amount of condensed water due to abnormal factors entering the adsorption tower will lead to deterioration of adsorption, a sharp rise in dew point temperature, in severe cases, the adsorbent broke into powder (specifically: from the muffler spray powder, post-dust The filter is clogged and the consequence of the adsorbent must be replaced. This is because: After a large amount of condensed water enters the adsorption tower, the adsorbent instantaneously adsorbs a large amount of water and emits a large amount of adsorption heat. Since the adsorbent is a non-heat-conductive body, the adsorption heat cannot be dissipated in time and the liquid water in the adsorbent pores is released. Absorption, when the heat is sufficient, the volume of water evaporates into gas and expands rapidly to burst the adsorbent. Therefore, it is absolutely necessary to configure the water separation device before the suction dryer.
(d) Oil-lubricated piston-type air compressors generally referred to as oil mist (except for labyrinth, positive-pressure-packed protection, and low-power all-oil-free machines) There is still a certain amount of lubricant in the exhaust, depending on its structure and The specifications vary from about 6 to 15 mg/m3. Oil-injected screw air compressors with oil equivalent to an oil-free piston engine are generally considered to have oil-separator efficiency and exhaust gas temperature of 5 to 15 mg/m3, whichever is the median value of 10 mg/m3. M3.
(5) Regeneration Gas Volume In the previous chapters, there was a lot of discussion about the amount of regeneration gas. It should be emphasized here that the amount of regeneration gas cannot be arbitrarily adjusted during the operation of the dryer. In addition, for the regeneration dryer, the instantaneous flow rate of the regeneration gas should not be too small, otherwise it will reduce the heat transfer efficiency of the regeneration gas as a heat carrier, cause local overheating and most of the heat, destroy the structure and performance of the adsorbent, and the flow rate Small flow rate will be too low, easy to form because of air flow across the adsorption layer short circuit and the formation of "ramming effect" resulting in uniform heat transfer and effective desorption.
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Adsorption compressed air dryer conditions of use
Conditions of Use: