Air-cooled Combined Type Air Dryer

The air-cooled combined type air dryer is composed of a refrigerated compressed air dryer and an adsorption (non heated or heated) compressed air dryer through reasonable pipeline connection and volume matching. The refrigerated compressed air dryer has very strong water removal capacity, low operation energy consumption and no air loss. Combined with the adsorption compressed air dryer, which can achieve low dew point, it can give full play to the advantages of both.

● Low dew point: the combined low dew point dryer can reach a very low pressure dew point, which can reach below -40 ℃ in general and -70 ℃ at least according to different user requirements;

● It can provide compressed air with different dew points for different gas consumption points;

● All operating switches of the combined low dew point compressed air dryer and some display instruments of the cold dryer are centralized on the panel of the box plate. The refrigerated compressed air dryer and the adsorption regenerative compressed air dryer can operate independently or simultaneously cold and suction according to the needs of customers;

● The gas-liquid separator adopts the self-designed three-stage separation method: direct impact separation + low-speed centrifugal separation + stainless steel wire mesh demisting separation. 99.9% of the liquid water is separated from the cooled compressed air to prevent the secondary evaporation of water and ensure the low dew point quality of the product gas;

● The high-quality switching valve is stable and reliable, which can ensure the integrity of the workflow and prolong the working life of components;

● The fully or semi enclosed refrigeration compressors of Danfoss (Denmark), Fusheng (Taiwan), Panasonic (Japan), Bitzer (Germany), Copeland (Germany) and MANEUROP(France) are used as the refrigeration compressors, with stable operation, low noise, high cop, reliable performance and long power saving life;

Applicable working conditions

Design working conditions

Note: Air cooled equipment above 80m³/min（including 80m³/min）without canopy

The combined dryer, popularly speaking, is the combination of the traditional cold dryer and the dryer. There are various combination processes in the industry. The most common one is to install the cold dryer in series with the suction dryer, which is a relatively mature technology. The combined dryer has the following technical features:

Energy saving and high efficiency

The energy consumption of the cold dryer is the same as that of the traditional cold dryer; The energy consumption of the dryer is 1/2 to 1/3 of that of the traditional micro heat dryer due to the extended working cycle. The combined dryer with reasonable configuration is about 6% to 7% of the energy consumption of the air compressor. This will be significantly lower than conventional micro heat dryers.

Dew point stability

Since the load of the dryer is only about 20% of that of the conventional case, it should be noted that since the volume flow of compressed air has not decreased, the diameter and height of the adsorption tower cannot be reduced, and the cost cannot be significantly reduced, but the dew point can be greatly improved.

Reliable operation

As both the cold dryer and the suction dryer work under relatively good working conditions, they can achieve relatively good reliability and avoid the problem that the dryer is prone to failure under bad working conditions.

Reduce space

The cold dryer and the suction dryer are connected in series and installed on the integrated base, which can be skid mounted and placed on the ground as a whole, reducing the floor area.

Easy installation

The piping of the cold dryer, the suction dryer and the filter shall be skid mounted at one time to reduce the user's installation process.

The cold dryer and the suction dryer can be connected in series to form a combined air dryer

Clean, low moisture content instrument or process compressed air is often required in chemical process. The refrigeration dryer is based on the principle of refrigeration dehumidification, while the heatless or slightly heated regenerative dryer is based on the principle of pressure swing adsorption to dry and dehumidify the compressed air. Generally, the pressure of compressed air is mostly 0.7-0.8Mpa, and the dew point of finished air under normal pressure can only reach about - 22 ℃ due to the restriction of refrigeration dehumidification principle. The heatless and slightly heated regenerative adsorption dryer uses the unique micropores of the desiccant itself to adsorb water molecules in the air according to capillarity, and at the same time, remove the adsorbed water according to pressure relief desorption and adsorption waste heat heating. Generally, the dew point of dry gas under normal pressure reaches - 50 ℃. Operating pressure 0.7-0.8Mpa; Higher dew point of product gas can be achieved by mixing adsorbent and molecular sieve. The main problem of the micro heat regenerative adsorption dryer is the randomness of the heating temperature, because the micro heat regenerative adsorption dryer is similar to the heatless regenerative adsorption dryer, which uses its own low pressure dry air as regeneration gas. Therefore, in a large temperature range, even without heating the adsorbent, the active regeneration can be achieved according to the principle of "pressure swing adsorption". The difference is that when the heating temperature is high, the desorption gas consumption is small. When the heating temperature is low, the desorption gas consumption is high. This randomness makes it difficult to unify the gas consumption index, so it is difficult to accurately grasp the regeneration degree of the adsorbent in specific operation. Under some false appearances, the regeneration gas consumption is too small, resulting in incomplete regeneration of the adsorbent. The best way to solve this problem is to formulate relevant national standards or industrial standards as soon as possible on the basis of theoretical research. It is difficult to obtain dry air with dew point below - 50 ℃ by using refrigeration dryer or adsorption dryer alone, which must be used in series; Dew point of product gas can be reduced by increasing regeneration gas volume; Prolong the heating and regeneration time of the adsorbent, so that the adsorbent can be completely regenerated, and give full play to the regeneration effect, thus reducing the dew point of the product gas; In order to stably obtain dry air with dew point below - 50 ℃, the cold dryer and the micro heat regeneration dryer (or the heatless regeneration dryer) must be used in series.

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