CONDITIONING TOWERS, LYRBasic data for project planning

Application

Conditioning towers in the cement industry areused for cooling exhaust gases from the kilnbefore they are conveyed to the electrostaticprecipitators. The hot exhaust gases enter thetop section of the vertical, cylindrically-shapedand insulated tower for cooling by water injec-tion. The gases are drawn through the condi-tioning tower by a fan. There are three differentstandard inlet types named W, V, and C, thechoice depending on the installation and theposition of the fan. There is a special version ofthe W-type with a single inlet, called the L-type.All inlet types are horizontally adjustable 360°.

FLS Conditioning Towers LYR in the cementindustry treat exhaust gases with temperaturesbetween 300 and 400° C, cooling them down to150° C. However, conditioning towers capableof handling gases up to 1000° C are also avail-able. The conditioning towers are standard de-signed for an underpressure of 300 mm WG or800 mm WG. Apart from these, standard condi-tioning towers designed for higher WG valuesare also obtainable.

The freshwater used for the conditioning pro-cess must be mechanically cleaned in an 0.5

Design and operation

1 Gas inlet2 Nozzle platform3 Inspection door4 Supporting ring

5 Gas outlet6 Drag chain7 Inspection and clean out cover8 Sluice

mm coarse filter. Water containing more than 500mg CaC0

3/l H

2O can give rise to problems.

The water has to be stored in a reservoir fromwhere it passes through a double fine filter (100micron mesh) for further purification in order toreduce the nozzle wear.

The water is pumped to the system of spillbacknozzles in the conditioning tower at a pressureof 35 bars. All the nozzles, which atomise solelyby water pressure, are fed from the same pres-sure pipe with a joint return pipe to the reservoir.

Each water spillback nozzle lance is fitted with acoarse filter to retain impurities from the pipesystem after the fine filter and two non-returnvalves to minimise the water dripping from thenozzles if the pump stops operating. The non-return valve at inlet has an opening pressure ofapproximately 0.5 bar. The nozzle lances areavailable with one, three or four nozzles.

The conditioning process is monitored by athermosensor at the exhaust gas outlet. The con-stant temperature is maintained by continuous

regulation of the injected water by a motorisedregulation valve in the return pipe and acontroller.

The water regulation - without changing theamount of nozzles- is 10:1.

The dust not conveyed to the electrostaticprecipitator via the exhaust gases is collected inthe bottom of the conditioning tower andextracted by a drag chain conveyor and a doubleflap sluice.

As the moisture in this accumulated dust cancause transport difficulties, a thermosensorfitted in the bottom hopper registers heat varia-tions and generates an alarm signal.

Because of the uncomplicated system used inFLS Conditioning Towers the operation andmaintenance are simple.

The type names given to FLS ConditioningTowers e.g. LYR 250 x 63 indicate the following:LYR = vertical/gas-stream downward/ waterspill back nozzle. 250 = effective height(dm), 63 = diameter (dm).

Dimensioning

Example: 4500 m3/min. exhaust gases with atemperature of 350°C to be cooled down to150°C.Type 300 mm WG orType 800 mm WG.

Solution: Conditioning tower, LYR 250 x 63Height (H): 25 m,Diameter (D): 6.3 m,Water consumption: 12 m3/h,Theoretical power consumption: 29 kW,Minimum motor size, (29x1.1): 32 kW.

Weight: Type 300 mm WG:30.0+(25x1.12) = 58 tType 800 mm WG:30.0+(25x1.40) = 65 t

Hx32 4000 1800 6340 3200 2480 900 400 4250 2295 1120 4715 2260 2000 3090 2555 800 850 224 13.0 0.58 0.70

Hx40 5000 2240 7950 4000 3100 1120 475 5000 2860 1400 5920 2820 2500 3870 3060 1000 1063 280 16.0 0.70 0.90

Hx50 6300 2800 10050 5000 3900 1400 560 6000 3595 1800 7485 3530 3150 4820 3655 1250 1330 355 20.0 0.90 1.10

Hx63 8000 3550 12650 6300 4856 1800 560 7100 4525 2240 9475 4450 4000 6060 4435 1600 1700 450 30.0 1.12 1.40

Hx80 10000 4500 15900 8000 6200 2240 670 8500 5740 2650 11840 5650 5300 7650 5425 2000 2130 560 45.0 1.80 1.80

Hx95 11800 5300 18950 9500 7345 2650 750 9500 6785 3350 13985 6720 6300 9070 6310 2360 2510 670 60.0 2.12 2.12

TYPE

Dimensions (mm)

A B C D E F G H K L M N P R S T U V Y

WeightBasic

(t)Variable (t/m)Type300mmWG

Type800mmWG

See

dia

gram

abo

ve

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, l-00136 Rome • SPAIN: F. L. Smidth & Cia. Española, S.A., Calle deJorgeJuan, 46, Madrid 1 • CANADA: F.L.Smidth &Co. of Canada, Limited,1500 De Maisonneuve Blvd. West, Montreal, Quebec, .Canada H3G 1H1 • U.S.A.: F.L. Smidth & Co., 300 Knickerbocker Road, Cresskill, New Jersey 07626 • MEXICO:F. L. Smidth &Cia., S.A. deC.V., Ave, Campos Eliseos.385,5°piso,Torre B, Polanco, Mexico City 5, D.F. • BRAZIL: F. L. Smidth, S.A. Comércio e indústria, Rua Nebraska, 459, BrooklinPaulista -CEP-04560,Caixa Postal 3506,01000 São Paulo -SP JAPAN: F. L. Smidth &Co. (Japan) Ltd. .Togeki Building 1-1,Tsukiji4-chome,Kyobashi P.O. Box 78, Chuo-ku, Tokyo 104.