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Chemical Technology • March 2016
11
PETROCHEMICALS
CONTROL &
INSTRUMENTATION
advanced combined cycle power plant is close to 60 %, and
with waste heat recovery using LNG, the overall thermal
efficiency can be improved to over 70 %. Note that the
Grain LNG terminal is a world scale plant with a capacity of
14,8 million tonnes per year.
Comparison of vaporiser options
The optimum choice of an LNG vaporisation system is
dependent on the terminal’s capacity, site conditions,
environmental and regulatory permits, and opportunities
for waste heat recovery. Note that the current study is
developed for today’s small to mid-scale LNG terminals.
The results may be different for large scale LNG terminals.
Table 1 compares the seven vaporiser options in term of
their applications, operation and maintenance, utility and
chemical requirements, environmental impacts and relative
plot sizes.
The seven options considered in this study are:
• Option 1 uses ORV as in existing regasification terminals
Figure 8: Typical gas turbine performance vs ambient
temperatures
Figure 9: Combined cycle power plant integration