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Osaka Gas believes that technologies serve as the foundation of corporate competitiveness, and considers R&D to be one of the most important elements in the strategy to make a difference.
For this reason, Osaka Gas works actively on R&D and commercialization of new technologies, as presented below.
The 150 t/h LNG cryogenic power plant will reduce CO2 emissions by approximately 15,000 tons a year.
Recovery, in form of electric power, of cryogenic energy, which would otherwise be wasted from LNG vaporization facilities, reduces power consumption at LNG import terminals, and by extension CO2 emissions from thermal power plants.
Osaka Gas has operated cryogenic power generation systems safely and stably for more than 30 years, the longest such operating period in the world.
Osaka Gas is a pioneer in the field of LNG cryogenic power generation plants using the Rankine cycle.
in Osaka Gas
|No. of units||Operation commenced||Power output [kW]||Process||LNG
|Senboku 2||1||Dec. 1979||1,450||Rankine||60|
|Senboku 2||1||Feb. 1982||6,000||Rankine +
Direct NG expansion
■The simple processes have the following advantages:
■ High corrosion resistance
Heat exchanger tubes made of titanium resist corrosion caused by seawater passing through them. Consequently, they contribute to reduced maintenance cost.
■ Osaka Gas's cryogenic power generation facilities also offer the following advantages:
■ Services from Osaka Gas (Examples)
Cryogenic LNG (−160℃) has a potential for cryogenic energy recovery of some 240 kWh per ton of LNG if 100% recovery is achieved. We believe that recovering cryogenic energy as motive power is highly important from an energy-saving point of view. Based on this belief, Osaka Gas actively promotes technology development, such as novel cryogenic power generation systems and cold energy storage.
Three types of LNG cryogenic power generation facilities are presently in operation: Rankine cycle, direct NG expansion, and Rankine cycle + direct NG expansion. The operating principle is explained below, taking as an example a Rankine cycle using propane as intermediate heating medium.
The LNG pressure is increased to 3.5 to 4.5 MPaG by LNG pumps. The LNG vaporizer transfers heat from propane gas to LNG. Veaporized LNG then enters the NG trim heater and is heated to 0ºC or higher by sea water. The liquid propane condensed in the LNG vaporizer via heat exchange with LNG is pressurized by the circulation pump and sent to the propane vaporizer where it vaporizes at a pressure in accord with the temperature of sea water. Vaporized propane gas drives the turbine during the expansion process and generates electricity. Subsequently, the propane gas is condensed again in the LNG vaporizer.
Osaka Gas pioneered research and development of LNG cryogenic power generation facilities ahead of our competitors and constructed the first commercial unit. Since then, we have been actively working on R&D of LNG cryogenic utilization technology