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Application

Most industrial processes generate dust. This dust may profitably be removed for pollution abatement and material recovery purposes. FLS Central Jet Pulse filters are modular bag filters in which the dust-laden air enters through the base or side of the casing, and is evenly distributed between the filter bags. The dust is deposited on the outside of the needle felt bags, while the air passes through the felt into the clean air chamber at the top of the casing before release in the atmosphere. The bags are cleaned by the injection of an ultra- short burst of air. The dust dislodged from the bags either fails direct into a silo (bunker filter), or into the bottom-hopper for return to the production process via an air lock. The air jet burst cleans each row of bags in turn. The blast is triggered by the electronic control unit based on the pressure drop across

Design and operation

the filter. This operating principle causes a constant flow and pressure drop, and implies that the dustremoving frequency is adapted to the current dustload. This method minimises the risk of clogging in the pipe system, and also increases the lifetime of the bags by cleaning only when necessary. The preset level for jet pulse release is in most cases l25mm WG but other levels may also be applied. The filter module comprises 3, 4 or 5 rows, each with 7 cylindrical bags mounted on wire cages 3 m in length and 120 mm in diameter. The filtration area is thus 1.15 m2 per bag. Dedusting capacity is 80—180 m /h per M filtration area according to dust type and operating conditions. 3

2

FLS Jet Pulse Filter, Type CE 1 comprises 1, 2,4 or 6 basic modules, Type CE 2, an even number of 8-20 modules and Type CE 3 an even number of 22-36 modules. The three types have individual designs of air intake.

Type CE 1 has a pyramid-shaped bottom-hopper while Types CE 2 and CE 3 have troughshaped hoppers. In all three types replacement of bags is effected from the top of the casing (the clean air chamber). All types of industrial dust can be handled. Filters for coal have special features to prevent explosions and fires. The filter is designed to give trouble-free operation 24 hours a day and requires a minimum of maintenance. Filter operati on costs are very often offset by the value of the material recovered. Further more, effective dedusting averts shutdowns, while the reduction in industrial pollution should be considered in each case. The type designations are CE 1, CE 2, and CE 3 (CEntral installation) followed by size specification digits indicating number of modules and number of solenoid valves, respectively.

Type of dust A Non-agglomerating dust (Fly ash, metal oxides) B Partially agglomerating dust (Cement, coal, limestone) C Heavily agglomerating dust (Gypsum, ground sand).

Type CE 1

Type CE 2 Dimensions mm

Size

A1

B

C min.

H

1120

1440

7450

5925

1-03 1-04

Solution : FLS Jet Pulse Filter, Type CE 2, Filtration area 400 m2 Size 10 - 25.

Example 700 m3 min. air (25oC) containing coal dust particles (dust type B), average size 50u (microns), dust load 40 g/m3, to be dedusted.

Type CE 3

Size

A2 (mm)

Filtra tion area (m2)

Consumption of compressed air (Nm3/h)

5

8-20

5120

322

70

22-55

11120

886

191

7

10-25

6120

403

87

24-60

12120

966

208 226

Filtration area (m2)

Consumption of compressed air (Nm3/h)

24 32

Size

A2 (mm)

Filtration area (m2)

Consumption of compressed air (Nm3/h)

1-05

40

9

12-30

7120

483

104

26-65

13120

1047

2-06

48

10

14-35

8120

564

122

28-70

14120

1127

243

64

14

16-40

9120

644

139

30-75

15120

1208

260

2-10

81

17

18-45

10120

725

157

32-80

16120

1288

278

4-06

97

21

20-50

11120

805

174

34-85

17120

1369

296

129

28

36-90

18120

1449

312

161

35

193

42

242

52

2-08

4-08

2120

2120

1440

2760

7950

8550

6425

7025

4-10 6-12 6-15

3120

2760

8850

7325

Data in this brochure series is only intended for preliminary project planning. Manufacturer reserves the right to modify equipment details and/or specifications without notice. DENMARK: F. L. Smidth & Co. A/S. Vigerslev Allé 77, DK-2500 Valby Copenhagen • UNITED KINGDOM: F. L. Smidth & Co., Ltd. 17, Lansdowne Road, Croydon, GB-CR9 2JT • FRANCE: F. L. Smidth & Cie - France, 55, Rue Ampére, F-75017 Paris • FEDERAL REPUBLIC OF GERMANY: F. L. Smidth & Co. GmbH, D-2400 Lübeck, Geniner Strasse 133-135 • ITALY: F. L. Smidth & C. Italiana, S.r.l., Via Lucilio, 25,1-00136 Rome • SPAIN: F. L. Smidth & Cia. Española, S.A., Calle de Jorge Juan, 46, Madrid 1 • CANADA: F. L. Smidth & Co. of Canada, Limited, 666 Sherbrooke St. West. Suite 1501, Montreal, Quebec, H3A IE7 • U.S.A.: F. L. Smidth & Co., 300 Knickerbocker Road, Cresskill, New Jersey 07626 • MEXICO: F. L. Smidth & Cia., S.A. de C.V., Ave, Campos Eliseos, 385, 5° piso, Torre B, Polanco. Mexico City 5, D.F. • BRAZIL: F. L. Smidth, S.A. Comercio e industria, Rua Nebraska, 459, Brooklin Paulista - CEP-04560, Caixa Postal 3506, 01000 Sao Paulo - SP • JAPAN: F. L. Smidth & Co. (Japan) Ltd., Togeki Building 1-1, Tsukiji 4-chome, Kyobashi P.O. Box 78, Chuo-ku, Tokyo 104.