LNG냉열이용 부유식 냉동 및 발전 복합플랜트 설계에 관한 연구

Abstract

Base on the energy diversification policy, Korea Gas Corporation started to import LNG from Indonesia in October 1986, and supplied natural gas to Gyeongin area through commercial operation of Pyeongtaek LNG terminal and imported from Malaysia in September 1991 also from July 1993 began to supplying to the Central area and also to the Yeongnam and Honam area. After that, commercial operation was started at the Incheon LNG terminal and the gas was supplied to the Busan area.

In the first decade since importing, LNG annual use amount is 17 million tons, the amount used every year increases, the basic fuel for catering and heating necessary for daily routine for the first time in 20 years has changed from briquettes and oil to city gas.

In order to reduce the volume of NG, liquefy the temperature to -162 ° C, transport it to the LNG carrier, store it in the LNG storage tank of Incheon, Pyeongtaek, Tongyoung and Gwangyang terminal and then supply to consumers after revaporizing it.

Methane, which is the main component of natural gas used as city gas, supplies high energy of 13,000 kcal/kg in the combustion process, so it plays a role as an excellent energy source, and to supply it to customers, LNG using a seawater type carburetor to heat to normal temperature NG, 200 kcal/kg of cold heat which is 2.5 times higher than the heat of ice melting which is the core heat source of ice heat storage is discarded to the sea.

The theoretical method for recovering the LNG cold which is discarded in this manner can use -155℃ cold heat generated in the vaporization process of LNG for liquefaction separation of air, released after liquefaction separation -130'C cold heat used for low temperature crushing of waste tires -100'C cold heat is used for metal forming and freezing warehouse and ice making and the cold heat generated after ice making can be supplied to cold heat required for cooling.

For this reason, academia and related companies have made great efforts, but in Korea, it is possible to use cold energy only if it is adjacent to the piping system supplied from the LNG receiving terminal. Due to the geopolitical restriction, it is judged that it can not recover the huge amount of cold heat released in the process of converting to gas and it is not economical.

However, in this study, we will focus on not only solving the above problems but also being able to recover enormous LNG cold heat if it is adjacent to the LNG supplier and the utilization recipient of LNG cold energy, I decided to do research on a freezing warehouse using LNG cold energy.

In the neighboring areas of the island of Indonesia, which is a producer and exporter of LNG, the existing mechanical compression refrigeration system is used for freezing fisheries such as tuna, which is a high quality fish family. In addition, LNG vaporization system is installed and NG is supplied to power production facilities reaching 100MW.

Therefore, a new concept, floating type Combined Cold storage and Power generator(CCP). This supply quick freezing warehouse using LNG cold energy and electricity from power generators using vaporized NG installed in the barge to Southeast Asia including Indonesia.