DH Series Combined Industrial Compressed Air Dryer

There is no air loss for refrigerated dryer. However, the air consumption of heatless dryer is generally 13%. A micro-heated dryer also has about 6% air loss.

But combination dryer has lower air consumption. For example, the heatless combination type is 4~6%. And micro-heated combination type is 3~5%. So it is more energy efficient.

Combination dryer is ideal for obtaining low dew points. Air compressor produces high-temperature, high-humidity compressed air. Firstly, a refrigerant dryer cools them to about 2~10°C.

At this time, it has discharge most gaseous water. What’s left is compressed air with very low moisture content. So, the working load of compressed air dryer desiccant is very low. Thus we can achieve -70℃ dew point easily. Also, the dew point is more stable.

Refrigeration dryer and desiccant air dryer for compressor are on the same base. So, it reduces the floor space.

Filters and piping are already installed on compressed air dryer system. Therefore, it reduces the installation process of the user.

Firstly, inform the air capacity, inlet temperature, and pressure. So we know which model to choose. In particular, different inlet air pressures are also different. The freeze dryer can be 16 bar, 25 bar, 40 bar, 60 bar, or 100 bar. And compressed air dryer desiccant can also be 1.6MPa, 2.5MPa, 4.0MPa to 10.0MPa.

Therefore, our combination dryer can also do medium pressure and high pressure. We also need to tell the dew point. One of the advantages of a combination dryer is the low dew point. We can do it up to -70°C.

The air-cooled refrigerated dryer is easily affected by ambient temperature. Especially in summer, the dryer is under heavy load. So it has an impact on dew point. Generally, it requires good ventilation.

There is no such problem for a water-cooled dryer. However, there needs to be a cooling water system. For example, it requires cooling pumps or towers. So, the initial investment is relatively large. But the working condition is more stable. If water resources are abundant, we can choose it.

There are many types of compressed air dryer desiccant. Just their energy efficiency is different. For example, the regeneration air consumption of a heatless combination dryer is 4~6%. The air loss of micro-heated is 3~5%. So, if energy-saving requirements are not high, you can choose them.

However, sometimes customers are concerned about saving energy. At this time, we need to choose a zero air loss desiccant air dryer.

In addition, there is also a modular compressed air dryer system. Its biggest advantage is its small size. It is easy to transport.

Sometimes customers require dryers of stainless steel. For example, the food and pharmaceutical industries require SS304.

We can customize a stainless steel refrigerated dryer. And also produces stainless steel compressed air dryer desiccant. In addition, filters and pipes can also be SS304.

In fact, the housing of our modular adsorption dryer is aluminum alloy. It’s also special for the pharmaceutical and food industries.

1. The ambient temperature should generally not exceed 40 ℃.
2. It needs good ventilation. But don’t install a compressed air dryer system outdoors.
3. The installation environment should be dry. There should not be wet.
4. In advance consider the convenience of maintenance. Besides, should maintain a horizontal position. So as not to affect the discharge of condensed water from the dryer.
5. We should prevent the dryer from being vibrated by the piping system.
6. Pipe diameter should not be smaller than the size of the compressed air dryer desiccant.
7. The pipeline should not be too long. So as not to cause water accumulation and large pressure drop.

1. You should install a power switch separately. Besides, the dryer’s working pressure must not exceed the rated value.
2. Do not share a protective device. The voltage fluctuation range shall not exceed 10% of the rated voltage.
3. The cables should not be too thin or too long. To avoid a voltage drop of desiccant air dryer for compressor.
4. The casing of the compressed air dryer system should be grounded reliably.
5. The power supply voltage is 380V/50HZ. (Other voltages can be customized).
6. Also, ensure there is good ventilation.
7. Check whether the inlet air temperature and pressure are normal.
8. We must cut off the compressed air dryer desiccant before maintenance.
9. Before maintenance or disassembly, pressure must be relieved first.
10. Check whether the cooling water is normal.
11. After running for 30 minutes, check whether the drainage system is normal.

① Startup

Firstly, turn on the start button of the refrigerated air dryer. So it starts to work. And wait about 5 minutes. Then, let compressed air into the dryer system.

Wait for towers A and B to have the same pressure and stand still. Then, turn on the power supply of the desiccant air dryer for compressor. Press the “Start button”. So the dryer starts to work fully automatically.

② Shut Down

Firstly, close the air inlet valve of the dryer. Then press the “Stop Button” on the two dryers. So they will stop working. Then, cut off the power to the compressed air dryer system.

③ Dry The Adsorbent

Use the self-drying method. Close the dry air outlet valve. Then, remove the orifice plate from the regeneration air tube. Increase the amount of regeneration air.

The load of compressed air dryer desiccant is very low now. The bottom layer has very little moisture absorption. A larger amount of finished air is used for regeneration and drying. Its dryness is high.

After 24 hours of drying, wait to reach the required dew point. Then, install the orifice plate. Finally, the desiccant air dryer for compressor is in the normal adsorption state.

④ Filling And Replacement of Adsorbent

We have used desiccant beads for a while. Usually three years. If the dew point is too high, it is necessary to check the adsorbent. Remove some from the tower. Check to see if it is contaminated (yellow in color).

If it is, must replace the desiccant pellets. We can take them out from the discharge port. Or fill from the upper loading port.

⑤ Replacement of Filter Element

The normal service life of the filter element is generally 8000~9000 hours. If the use time is short, the dryer dew point is high. Indicates that the air contains too much oil. So, we should replace the filter element in time. At the same time, check whether the oil discharge of the air compressor is normal.

The refrigerant dryer adopts a closed refrigeration cycle. It has a thermal expansion valve and a hot air bypass valve. The refrigerant expands directly. Finally, enter the evaporator. Sometimes, the production conditions and environment will change. This can cause changes in the evaporator heat load. At this time, both these two valves are automatically adjusted. Therefore, it can ensure a constant temperature for the dryer evaporator. So it prevents ice jams.

In addition, our compressed air dryer system is with safety protection devices. For example, it has refrigerant high and low-pressure controllers. It also has a current overload protector. In case of refrigerant leakage, it will cut off power automatically. Therefore, the compressor will be not damaged.

The compressed air dryer desiccant has a PC program controller. It can control the alternate adsorption and regeneration of the Twin Towers. Besides, it can display the working status in real-time. Moreover, it can control desiccant air dryer for compressors with time delay. Easy to use. And works reliably. The display is intuitive and clear.

① Maintenance of Sewage System

② Refrigerated Air Dryer

③ Desiccant Air Dryer For Compressor