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18 Antonino La Rocca et al.
matrix seeming that of Fig.10, but the inner of tubes has also an extended
surface and there are inside turbulence promoters. The shell of a unit has an
external diameter of 2.90m and is 12.00m long; there are 450 tubes of Stainless
Steel which have an external diameter of 1.5 inch.
Fig. 10 –Tubes proposed for the cryogenic regasifer of LNG (Dispenza et al., 2009 a).
The Open Rack facility is required for operation for which isn’t produced
Electric Energy or during maintenance operation. The Plant layout for a module
with a regasification capacity of 2 ×10 9 Stm 3 /y requires a whole surface of a
1,500 m 2 . The Plant operating with Nitrogen has seeming feature, but it requires
higher pressures inside the Bottom Cycle and its performance is lower.
The use of Helium calls for R. and D. on the related technology for a
large worldwide diffusion of this kind of CHP Plant, but it is very interesting to
look forward. Helium is easy available in USA, Russia and Italy, moreover, as
far as it pertains to the technology, much R. and D. was carried out in past years
for Nuclear Reactors Power Cycles.
The use of Nitrogen has the advantage that technology is easy available
on commission in the Petrochemical World.
4.2. The Proposed CHP Plants
Main characteristics of CHP Binary Cycles proposed are reported in the
following sections. Some other features of the CHP cycle proposed have been
described previously.
4.2.1. The Proposed CHP Plants Working with Helium. The values
reported pertain to a modular plant with a regasification capacity of 2 ×10 9
Stm 3 /y when working 24 h a day all a year around (270 days). The mean net
power inlet in bottom cycle is 74.32 MW, the mean Electric production 27.53
MW and 44.03 MW is the thermal power exchanged in the cryogenic regasifier.
The mean electric efficiency is of a 37%. The mean electric efficiency of top
cycle is of a 27%; the thermal power furnished is 168.7 MW and gross thermal
power recovered by flue gas is 80.78 MW while the Electric power produced is