DD Series – Standard Dryers

Overview
Desiccant Dryers are used where application require ADP upto -40° to -60°C (-40° to -76°F)

Range

3.5 cfm to 1200 cfm (6 m3/hr to 2030 m3/hr)

 

How Does it Works

How does it works?

Desiccant Dryer is based on the principle of heatless regeneration and the physical properties of desiccant to adsorb and desorb the water vapour. It uses pressure swing principle/purge air to generate the desiccant bed.

The Desiccant Dryer has two pressure vessels/towers filled with desiccant. While the air is dried in one tower/vessel, the desiccant in the other is regenerated, thus maintaining a continuous and automatic operation.

Drying: The wet compressed air is led into one of the adsorber towers through solenoid valves in the smaller models, and through pneumatically controlled valves in the bigger models. This wet compressed air is passed through a specially designed sieve tube for uniform flow of air through the desiccant tower, where it is dried. Part of this dried air is taken out and used for purging or reactivating the desiccant of the tower saturated with moisture. The balance dry air leaves the dryer through a check valve.

Regeneration: The purge air with a low water vapour pressure is passed over the desiccant (saturated with adsorbed moisture). The desiccant loses the adsorbed moisture which is expelled into the  atmosphere via outlet valve through a muffler. Now the desiccant is dry and ready for adsorption. The heat of adsorption released  during this process raises the temperature of the desiccant, which in turn stimulates the liberation of the adsorbed water vapour and thus, the regeneration.

Change Over: After a preset time, the desiccant in the first tower needs to be regenerated as it is saturated with the adsorbed moisture. The outlet purge air valve of the second tower is energised in a sequence, where the outlet valve closes first to pressurise the adsorbent in the tower in regeneration mode. The second tower now becomes the adsorber while the first changes to regeneration mode. The wet compressed air now passes through the fresh regenerated adsorber tower thus setting up a continuous process.

Key Features / Benefits

  • Wide range with 19 standard models
  • Capacities from 6.3 m3/hr. to 2030 m3/hr. Higher capacities are available on request
  • Atmospheric dew point achievable (-) 40°c to (-) 60°c
  • Electronic controls/solid state timers for automatic and reliable operation
  • Low power consumption
  • Equipped with muffler on purge air outlet to reduce noise level
  • Specially graded desiccant Delsorb 10 and Delsorb 21 for optimum performance and long life

OPTIONAL FEATURES

  • Humidity indicator
  • Filters and/or total dryer bypass line with valves
  • Special Delair Filters for removal of water, oil mists, oil vapour and dust particles with electronically operated drain valves
  • Explosion proof controls for offshore application
  • Construction according to various codes

STD. WORKING PARAMETERS

  • Working Pressure: 5 to 14 kg/cm2(g)
  • Air inlet temperature: 40°C
  • Ambient temperature: 40°C

Technical Specification

Desiccant Dryer – Standard series


Range

MODEL No.
CAPACITY IN M3/HR.PRESSURE IN BAR (G)
5
6
7
8
9
10
11
12
13
14
DD-6
4.5
5.4
6.3
7.1
8.0
8.9
9.8
10.7
11.6
12.5
DD-12
8.9
10.7
12.5
14.3
16.1
17.9
19.6
21.4
23.2
25.0
DD-25
17.9
21.4
25.0
28.6
32.1
35.7
39.3
42.9
46.4
50.0
DD-55
38.9
46.6
54.4
62.2
70.0
77.7
85.5
93.3
101.1
108.8
DD-85
60.4
72.4
84.5
96.6
108.6
120.7
132.8
144.9
156.9
169.0
DD-110
78.2
93.9
109.5
125.1
140.8
156.4
172.1
187.7
203.4
219.0
DD-170
120.7
144.9
169.0
193.1
217.3
241.4
265.6
289.7
313.9
338.0
DD-340
241.4
289.7
338.0
386.3
434.6
482.9
531.1
579.4
627.7
676.0
DD-425
301.8
362.1
422.5
482.9
543.2
603.6
663.9
724.3
784.6
845.0
DD-680
482.9
579.4
676.0
772.6
869.1
965.7
1062.3
1158.9
1255.4
1352.0
DD-850
603.6
724.3
845.0
965.7
1086.4
1207.1
1327.9
1448.6
1569.3
1690.0
DD-1100
784.6
941.6
1098.5
1255.4
1412.4
1569.3
1726.2
1883.1
2040.1
2197.0
DD-1520
1086.4
1303.7
1521.0
1738.3
1955.6
2172.9
2390.1
2607.4
2824.7
3042.0
DD-1700
1207.1
1448.6
1690.0
1931.4
2172.9
2414.3
2655.7
2897.1
3138.6
3380.0
DD-2030
1448.6
1738.3
2028.0
2317.7
2607.4
2897.1
3186.9
3476.6
3766.3
4056.0

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