Seyang Coporation

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CRD Series

Cost-saving type,
combination-type air dryer

High capacity compressed air system which requires dew point below -60 ℃
Combining refrigeration-type dryer and adsorption-type dryer into one integrated system can dramatically reduce operating costs compared to when adsorption-type dryer is run alone. Thus, investment costs can be recovered in a short period of time.

CRD Series

Product Features

Perfect system composed of only the advantages of the refrigeration-type and adsorption-type dryers, respectively.
Minimizes maintenance costs.
Below -80°C of dew point under pressure possible.
Possible to operate with one system only in emergency situations.

Energy Savings

Power costs can be saved by making the refrigeration-type dryer, which has low operation costs, to perform 7/8 of the total operation. This is possible because the adsorption-type dryer accepts cooler, drier air, which minimizes the bed size and the energy required to regenerate the bed.
More savings can be made when operating at high temperature or low pressure with high moisture content.
For additional savings, you can leave the adsorption-type dryer off during a period of warm weather.
Refrigeration-type dryers use refrigerant bypass valves whilelarge-scale units use refrigerant compressor unloaders.
The adsorption-type dryer consists of a fully insulated tower, heater and purge piping in order to stop the heater from operating and prevent heat loss as the adsorbent bed is regenerated, including a temperature sensor for energy-saving and temperature-reduction.
It is designed to reduce pressure drops throughout the whole system.

Performance

Keeping constanttemperature at outlet-point as well as constant dew point: full cooling during regeneration eliminates unstable conditions (Spikes) during tower replacement.
When surrounding dew point is lower than conditions in the original design, dew point under pressure at outlet-side goes down.
For units with oil filters,filtersare installed at positions with the lowest temperatureto increase efficiency.

Reducing Maintenance Costs

Low regeneration temperature and long cycle duration mean longerlifetime for the adsorbent. Typically the adsorbent lifetime ranges from 3 to 5 years.
Because the size of the bed is generally only 1/3 of the adsorption-typedryer, the cost of replacing the adsorbent is minimized.
For additional savings, you can leave the adsorption-type dryer off during a period of warm weather.
Long cycle duration reduces valve wear. When adsorption-type dryer is bypassed during a period of warm weather, regular maintenance work can be carried out without interrupting air supply.

Space Saving

Large-scale modelsare offered as a connected-type assembly on two self-supporting skids.
Refrigeration-type dryer and an oilfilter (if supplied) are placed on one skid and a blower purge adsorption-type dryer and an after-filter are placed on the other support skid.
Such design, separating them into two parts, makes better use of space compared to having them as one large single unit.
Those two parts can be installed separately. In other words, one part can be installed on the floor while the other part can be installed at a higher ground.
Skids are fully assembled and include a 3-way by-pass valve to allow solo operation of refrigeration-type dryer.

System Configuration

MODEL	Treating Flow Rate (㎟/MIN)	Refrigeration-type Dryer	Adsorption-type Dryer	Filter	Port Size
CRD-1000	30	CR-1000	CD-1000	NH-3100 100A	4" F
CRD-1500	45	CR-1500	CD-1500	NH-3100 100A	4" F
CRD-2000	72	CR-2000	CD-2000	NH-3100 100A	4" F
CRD-2500	87	CR-2500	CD-2500	NH-3100 150A	6" F
CRD-3000	101	CR-3000	CD-3000	NH-3100 150A	6" F
CRD-3500	116	CR-3500	CD-3500	NH-3100 150A	6" F
CRD-4000	130	CR-4000	CD-4000	NH-3100 150A	6" F
CRD-4500	145	CR-4500	CD-4500	NH-3100 200A	8" F
CRD-5000	176	CR-5000	CD-5000	NH-3100 200A	8" F
CRD-6000	147	CR-6000	CD-6000	NH-3100 200A	8" F
CRD-7000	202	CR-7000	CD-7000	NH-3100 250A	10" F
CRD-8000	231	CR-8000	CD-8000	NH-3100 250A	10" F
CRD-8500	246	CR-8500	CD-8500	NH-3100 250A	10" F
CRD-10000	289	CR-10000	CD-10000	NH-3100 250A	10" F
CRD-12000	347	CR-12000	CD-12000	NH-3100 250A	10" F
CRD-15000	434	CR-15000	CD-15000	NH-3100 300A	12" F
CRD-20000	580	CR-20000	CD-20000	NH-3100 250A	14" F

※ System configuration mentioned above is based on standard models. Please consult with us for further details.
※ Possible to manufacture models other than standard models.
※ For adsorption-type dryers, externalheater-type other than blowerpurge-typeare also available.

CRD Series

Configuration Overview

In the past, in order to obtain dew point of below -40°C under working pressure and to reduce maintenance costs, a system, where a refrigeration-type dryer is installed at the front-end and an adsorption-type dryer directly connected at the rear-end, was formed. Since humidity of compressed air passing through the front-end refrigeration-typedryer is unsaturated (about 20% RH), the absorption rate of the adsorbent atthe rear-endof the adsorption-type dryer is drastically lowered. Also, the refrigeration-type dryer maximizes the moisture absorption rate by absorbing saturated (4°C, 100% RH) compressed air before passing it through the refrigeration-typecooling heat exchanger so that energy consumption is minimized hence, securing the lowest compressed air with the least amount of maintenance costs.