Dipleg tubes

An integral CFB (ICFB) was thus proposed to combine the four major component parts in a single concentric-tube structure the fast bed, a circular V-valve (CV-valve), an internal multi-inlet cyclone and its dipleg (Liu, 1990 Kwauk et al, 1991). 

For external cyclones, people often measure the pressure drop from a point immediately before the cyclone inlet to a point immediately above the cyclone in the gas outlet tube. This measurement does not include the contraction pressure drop as gas flows from the freeboard of the bed into the exit gas line from the fluidized bed. For dipleg seal height calculations, this pressure drop should be taken into account. It is better to measure the total cyclone pressure drop as the difference between the pressure in the freeboard and the pressure in the gas outlet tube. 

Bed internals such as diplegs, heat exchanger tubes, sampling probes and baffles can have an important effect on gas bubbles. The effects of vertical rods such as cyclone diplegs and vertical... 

The refractory material is normally installed 25 mm thick over a 25 mm thick metal liner in the form of a mesh, which acts as an anchoring system, that is first securely welded to all internal surfaces of the cyclone exposed to erosive wear. This generally includes all inside surfaces except, in some cases, all or part of the inside or outside surface of the vortex tube. If the cyclones are equipped with diplegs, such as those in FCCU service, the re-... 

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