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Sahara Air Products

Blower Purge Air Dryer

Theory of Operation

 

Left Tower Drying;

 

Right Tower Heating

 

Wet air enters the dryer and is directed into the drying tower through the left inlet switching valve. The wet air is dried in the left tower and exits the dryer through the left outlet switching valve.

Regeneration of the right tower is accomplished by drawing ambient air into a centrifugal blower, increasing the pressure to 2.5 psig and blowing this ambient air into the heater. The regeneration air is heated to 365°F and is directed into the right tower, where it removes the water from the desiccant. The hot, wet regeneration air exits the dryer through the right purge exhaust valve. After 3 hours of heating, the heater is turned off and the dryer enters the cooling cycle.

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Left Tower Drying;

 

Right Tower Exhaust Cooling

 

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

Specifications

Model

Rated Flow (SCFM)

Length = A
(Inches)

Width = B
(Inches)

Height = C
(Inches)

Approx. Weight
(Lbs.)

Conn.
Size
(Inches)

Desiccant per Tower
(Lbs.)

Blower
(HP)

Heater Size
(KW)

Avg. Power *

(KWH/24Hrs.)

BP-70

70

58

48

72

545

3/4

40

0.5

2

36.37

BP-100

100

62

50

72

725

1

60

0.5

3

48.12

BP-140

140

58

50

65

798

1

80

1

4

72.74

BP-210

210

80

48

72

875

1 1/2

120

2.5

5

127.01

BP-280

280

80

48

105

1238

1 1/2

160

2.5

7.5

154.43

BP-350

350

92

48

82

1368

2

200

2.5

10

181.85

BP-420

420

92

48

84

1537

2

240

4.5

10

245.07

BP-490

490

92

48

84

1760

2

280

4.5

12

272.49

BP-560

560

99

48

96

2002

2

320

7

15

344.67

BP-630

630

101

48

100

2306

3

360

7

15

372.09

BP-700

700

103

54

96

2426

3

400

7

24

399.5

BP-770

770

105

60

96

3019

3

440

10

24

480.63

BP-840

840

105

66

98

3140

3

480

10

24

508.05

BP-980

980

153

80

85

3533

3

560

7.5

24

518.13

BP-1120

1120

170

65

85

3792

3

640

7.5

30

572.97

BP-1260

1260

170

65

85

4103

3

720

10

30

672.56

BP-1400

1400

170

70

90

4898

3

800

10

40

727.4

BP-1540

1540

185

75

90

5225

4

880

10

40

782.24

BP-1680

1680

185

75

90

5535

4

960

10

40

837.08

BP-1820

1820

185

80

90

5840

4

1040

15

40

981.43

BP-1960

1960

192

90

92

6083

4

1120

15

50

1036.27

BP-2100

2100

206

95

113

6765

4

1200

15

50

1091.1

BP-2380

2380

206

100

113

6989

4

1360

20

60

1290.29

BP-2520

2520

216

75

113

7535

6

1440

20

60

1345.13

BP-2660

2660

216

75

113

7917

6

1520

20

60

1399.97

BP-2800

2800

210

85

113

8206

6

1600

20

75

1454.81

BP-2940

2940

210

85

113

8425

6

1680

20

75

1509.65

BP-3080

3080

210

85

113

8585

6

1760

20

75

1564.48

BP-3220

3220

210

85

113

9070

6

1840

20

75

1619.32

BP-3360

3360

210

85

113

9330

6

1920

25

75

1763.67

BP-3500

3500

240

85

104

20020

6

2020

25

90

1818.51

BP-4000

4000

240

85

104

21120

6

2310

25

90

2014.36

BP-4500

4500

255

90

104

22910

6

2600

30

100

2299.72

BP-5000

5000

260

90

104

23430

6

2890

30

130

2495.57

BP-5500

5500

260

90

104

24640

6

3180

30

130

2691.43

BP-6000

6000

265

90

110

25850

6

3470

40

150

3066.3

BP-6500

6500

265

90

110

27060

6

3760

40

150

3262.15

BP-7000

7000

270

95

115

28270

6

4050

50

180

3637.02

BP-7500

7500

275

95

115

29920

8

4340

50

180

3832.87

BP-8000

8000

275

95

115

31130

8

4630

50

180

4028.72

BP-8500

8500

280

95

115

31900

8

4910

50

200

4224.58

BP-9000

9000

300

100

120

33495

8

5200

60

200

4599.44

BP-9500

9500

300

105

120

34210

8

5500

60

250

4795.3

BP-10000

10000

330

120

135

35200

8

5780

60

250

4991.15

 

Sahara reserves the right to make changes without notification. Some models not shown. Other sizes and 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.