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Developments in this area are directed mainly towards efficient packing bodies, having good mechanical strength, for large irrigated surface area with minimum resistance to gas flow, uniform acid distribution system, packing support plates offering less pressure drop and finally compact, high efficiency absorbers.
Packing bodies: Raschig Rings offer larger pressure drops because of free flow of gas and liquid along the axis and these are replaced with interlocking type saddles in modern designs. The non-symmetrical nature of saddle shape minimizes ‘pattern’ packing and combines randomness with packing homogeneity. Further improvement of interlocking type saddles by introducing perforations or internal structure is not possible because of difficulties in working with ceramics.
Ceramic Mini Rings developed have a ring structure with cross stiffening bars. High gas phase velocities without excessive liquid hold up increase the capacity of towers. Effective turbulent interaction between the phase while allowing free passage of gas gives low pressure drop and higher efficiencies as greater portion of surface is wetted presenting uniform liquid film in contact with turbulent gas stream. These packing bodies have 20% higher capacity than interlocking type saddles per unit mass transfer efficiency and higher efficiency per unit surface area.
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