LNG冷熱有効利用による排ガス中の炭酸ガス固化技術に関する研究

(低温下における流動層型熱交換器に関する研究)

抄録

In conventional natural gas combustion power plants, vaporization heat of liquefied natural gas (LNG) has been supplied by sea water and/or air.
In the plants, cold vaporization energy has been lost without any effective utilization. An advanced technology has been developed in which carbon dioxide in the flue gas is solidified and separated as dry-ice. Carbon dioxide in the flue gas of a LNG combined cycle is cooled and solidified by the evaporation of LNG.
Fundamental studies on fluidized bed heat exchanger were carried out to analyze heat transfer phenomena at low temperature. And the fluidized bed type heat exchanger was confirmed that they had high efficiency by striping off frost solidified on the surface of heat exchanger tube. The heat transfer coefficient at -135°C was calculated about 330-370 (W/m²•K) at the condition where C0₂ gas was solidified.