Chemical Technology March 2016

PETROCHEMICALS CONTROL &

INSTRUMENTATION

Figure 8: Typical gas turbine performance vs ambient temperatures

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.

Figure 9: Combined cycle power plant integration

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

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Chemical Technology • March 2016