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Abstract
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The energy released from the liquid fuel production process of natural gas is herein applied using Fischer
eTropsch synthesis for power generation, reboiler heat supply of absorption refrigeration system and
input steam supply of multi effect desalination. The simultaneous design of units and the integration of
processes in these structures reduce the equipment and increase the efficiency of developed integrated
structures. In this paper, an integrated structure of simultaneous power generation, desalination and
refrigeration cycle using a FischereTropsch GTL plant, is developed and investigated. This integrated
structure has capacity of producing 22.33 MW power and 3.756 kg s1 liquid fuels. Absorption refriger-
ation cycle with ammonia-water mixture as the working fluid can provide 5.2 MW refrigeration duty
with coefficient of performance of 0.4767. Multi effect desalination subsystem produces 16.83 kg s1
potable water. The developed integrated structure has the overall thermal efficiency of 51.9% and the
total exergy efficiency of 79.53%. The exergy analysis shows that highest amount of exergy destruction
ratio is occurred in autothermal reforming reactors and equal to 31.4%. Highest and lowest exergy
efficiencies are related to E110 heat exchanger (98.53%) and V4 expansion valve (49.13%), respectively.
The economic analysis demonstrates that the period of return and the prime cost of liquid fuels are 5.844
years and 296.3 US$.m3, respectively.
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