Gas Conditioning Tower Rev A

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F.L.SmidthAirtech Product Description Product Description Gas Conditioning Tower Technical Description Following for guidance only Gas Conditioning Tower (GCT) Technical Description Object of GCT The object of the GCT is to condition and cool kiln gas before it is dedusted in an electrostatic precipitator (ESP). The cooling of the gas protects the ESP from high temperatures and the higher humidity of the gas increases the performance of the ESP. Furthermore, some of the dust in the kiln gas
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       F .     L .    m     t     A    r     t    e    c ProductDescription    P  r  o   d  u  c   t   D  e  s  c  r   i  p   t   i  o  n Technical Description   Technical Description Following for guidance only Gas Conditioning Tower Gas Conditioning Tower  ProductDescription Gas Conditioning Tower (GCT) Technical DescriptionObject of GCT The object of the GCT is to condition and cool kiln gas before it is dedusted in anelectrostatic precipitator (ESP). The cooling of the gas protects the ESP from hightemperatures and the higher humidity of the gas increases the performance of theESP. Furthermore, some of the dust in the kiln gas is separated from the gas bygravity in the GCT. An additional purpose of the GCT is to cool the flue gas before it enters a processfabric filter (FF)where very low temperatures can be required in order to protect thefilter bags. General description FLSmidth Airtech is continually optimising the concept of the GCT. One of the keyfeatures where FLSmidth Airtech differs from others is in the effort of creating a goodgas distribution in the GCT.Two main types of Gas Conditioning towers are available.Type A with gas distribution by swirl and type B by grates.Both GCT types are for small to large gas flows i.e. 50 to 500 m3/sec Type A Type B  ProductDescription FLSmidth Airtech supplies two different systems of water injection, one is a onephase flow back system. and the other a two phase system where water andcompressed air are mixed.By using the two phase system, the droplets get smaller and the nozzles areexposed to less wear.The water injection is controlled by the thermodynamic system developed byFLSmidth Airtech. The thermodynamic control is faster and more exact than atraditional regulation system. Furthermore, it can automatically open and closelances according to the gas flow and temperature of the gas entering the tower.The water evaporates in the tower and thereby conditions the flue gas. The flue gasleaves the tower in the bottom where a hopper collects the dust separated by thegravity. The dust is removed by a dust transport system. Gas Distribution For small to large gas flows i.e. 50 to 500 m3/sec two main types A and B of GCTare available.The FLSmidth Airtech concepts includes a swirl generator and straightener unit or agrate, depending of type, positioned in the GCT inlet. The concepts controls the fluegas distribution in the tower giving the following key advantages: y Ensures hot flue gas at the tower wall, which prevents build-up of wet dust. y Only downstream and hot flue gas around water injection nozzles. y Low pressure drop across the tower. y A good mix between water droplets and flue gas. y Only lances of short length are needed.FLSmidth Airtech is continually optimising the operation of the GCT. One of the essentialfeatures to optimise is the gas distribution inside the GCT. The development is based onmodel experiments, computer simulations with the CFD program and continuous evaluationof our own experience and that of our customersIn the figure, Type A, the distribution in the tower is obtained with a swirl unit andstraightener In Type B the distribution is obtained with grates Velocity magnitudem/sec 6.0004.0002.0000.0000-2.000-4.000-6.000-8.000-10.00-12.00-14.00-16.00-18.00-20.00-22.00 Type A Type B Straightener SwirlGrate  ProductDescription Inlet transition Different types of inlet transition pieces are used, depending on the process involvedand/or the local plant conditions. Type B-60 Swirl type A Type U-045Type B-30 Type B-GV Cyclone tower From cycloneWith guide vanesWithout guide vanesWithout guide vanes Layout examples For GCT type A For GCT type A and BGrates type BFor GCT type A and BFor GCT type A and B
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