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Carbon Neutral Solutions
LNG cold energy utilization
Transforming LNG Cold Energy into Sustainable Solutions: Air Separation, CO2 Liquefaction & More
Overview
LNG possesses significant cold energy, approximately 200 Kcal/kg, which varies with its composition and origin. This energy is equivalent to heating LNG from -160°C to 0°C under atmospheric pressure and is often wasted as heat during the vaporization process when LNG transfers heat to seawater. LNG Cold Energy Utilization aims to recover this "energy"—the maximum theoretical mechanical work obtainable from LNG's thermal potential—and repurpose it for energy-saving and sustainable applications.
Why DGPS?
As a core member of the Daigas (Osaka Gas) Group, DGPS benefits from decades of expertise in cold energy utilization, drawing upon the Group’s pioneering initiatives. With DGPS as your partner, you gain access to:
- Proven leadership in LNG cold energy utilization with decades of hands-on experience.
- Advanced technologies and operational expertise developed across multiple cold energy applications.
- A collaborative approach rooted in the Daigas Group’s extensive portfolio of sustainable, energy-efficient solutions.
DGPS is uniquely positioned to deliver tailored solutions that maximize energy efficiency, reduce carbon emissions, and contribute to achieving your sustainability goals.
What DGPS can do
DGPS offers specialized assessments for clients looking to enhance the energy efficiency of their LNG terminals through effective LNG cold energy utilization by evaluating potential improvements and identifying optimal solutions to maximize energy savings and operational efficiency.
Pioneering Innovation:
This process extracts industrially valuable gases from the air, which primarily consists of nitrogen (78.08%), oxygen (20.95%), and argon (0.93%). LNG cold energy is utilized during the compression and liquefaction processes at the distillation column.
The purified feed air is directed to an air separation unit (ASU), where it is cooled to -180°C using a refrigeration system. Finally, the liquefied air undergoes distillation at the boiling point of each product gas. By utilizing LNG cold energy, the electricity required to operate the ASU can be reduced by up to 50% compared to the conventional air separation process that does not use LNG cold energy.
CO2 Liquefaction
The cold temperature of LNG is the best energy source for pre-cooling stage of flue gas containing CO2 before it enters the compressor. The compressed flue gas is subsequently introduced into the distillation column, where CO2 is separated from other substances. It is finally liquefied into product gas by the cold energy of LNG. Two plants have been in operation at Osaka Gas’ Senboku I and II terminals since 1980.
Intake Air Cooling for Gas Turbine
Theoretically, the output of gas turbine power generator decreases as the mass flow rate of intake air for gas turbine reduces at high ambient temperatures, especially in summer seasons. Therefore, cooling the intake air for the gas turbine effectively contributes to increasing power output. For this purpose, a substantial number of power plants in operation are equipped with electrical chillers. However, if LNG receiving terminals and gas turbine power plants are closely located, LNG cold energy can serve as an alternative to electricity for electric chiller.
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