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Sahara Air Products

Blower Purge Air Dryer

Theory of Operation

 

Blower Purge Flow - Heating

Left Tower Drying;

 

Right Tower Heating

 

Wet air enters the dryer and is directed into the drying tower through valve V1. The wet air is dried in tower T1 and exits the dryer through check valve CV1. Regeneration of tower T2 is accomplished by drawing ambient air into a centrifugal blower B, increasing the pressure to 2.5 psig and blowing this ambient air into heater H. The regeneration air is heated to 375°F and is directed into tower T2, where it removes the water from the desiccant. The hot, wet regeneration air exits the dryer through valve V4. After 3 hours of heating, the heater is turned off and the dryer enters the cooling cycle.

Acrobat icon Get Adobe Reader Blower Purge Flow - Cooling

Left Tower Drying;

 

Right Tower Cooling

 

Wet air continues to be dried in tower T1. During cooling, you have a choice of cooling methods. You can select blower cooling or exhaust purge cooling. If the dryer is located in a warm, humid environment, the use of blower cooling will cause an increase in dewpoint at tower shift. To provide continuous low dewpoint, you may select exhaust purge cooling. When this mode of operation is selected, the heater and blower are turned off at the end of 3 hours. Valve V7 is opened and a small portion of dry air (5%) is directed into tower T2 to cool the desiccant bed. After one hour of cooling, the valve is closed and the dryer is ready to shift towers.

Blower Purge - Drawing Side

Specifications

Blower Purge - Top Drawing

Model

Length = A
(Inches)

Width = B
(Inches)

Height = C
(Inches)

Inlet/Outlet
Size
(Inches)

Blower
Size
(HP)

Lbs. Desiccant per Tower

Heater Size
(KW)

Approx. Weight
(Lbs.)

Avg. Power *

(KWH/24Hrs.)

BP-100

48

26

67

1

1/2

60

3

510

40

BP-210

64

38

67

1 1/2

1/2

120

5

890

84

BP-350

93

49

84

2

1

200

10

1330

140

BP-700

97

59

95

3

4.5

400

24

2450

280

BP-980

146

63

88

3

7

560

24

3360

393

BP-1260

156

64

86

3

10

720

30

3890

505

BP-1540

178

64

92

4

10

880

30

5250

617

BP-2100

182

72

92

4

15

1200

50

6640

841

BP-2520

202

72

117

6

20

1400

60

8420

1010

BP-3080

210

78

115

6

20

1760

75

9100

1234

BP-3500

228

70

106

6

25

2020

90

14100

1402

BP-4000

228

70

106 

6

25

2310

90

16700

1603

BP-4500

243

80

108

6

30

2600

100

19300

1803

BP-5000

243

84

108

6

30

2890

130

20200

2003

BP-5500

243

84

112

6

30

3180

130

22700

2204

BP-6000

256

85

108

6

40

3470

150

23500

2404

BP-6500

256

85

108

6

40

3760

150

24600

2604

BP-7000

256

92

107

6

50

4050

175

25700

2805

BP-7500

258

92

114

8

50

4340

175

28900

3008

BP-8000

258

92

116

8

50

4630

200

30100

3205

BP-9000

290

106

123

8

60

5200

200

32500

3606

BP-10,000

300

110

128

10

60

5780

250

35800

4007

 

Sahara reserves the right to make changes without notification. Some models not shown. Larger sizes available. Other pressures available. Metric dimensions available upon request. Ratings are based on 100 PSIG, 100°F.

 

* Average power usage does not include savings by using SAHARA's Optional Dew Point Demand System.

Our sales engineers will help you select the right system for your application. They have the expertise to review your plant air system and design the optimum engineered solution.

 

We can build a dryer to meet your strict performance requirements.