Science and Technology Daily, Beijing, January 18 (Reporter Cao Xiuying) On the 18th, the country’s first LNG cold energy breeding demonstration project was officially launched at the CNOOC Guangdong Dapeng LNG Receiving Station (hereinafter referred to as the “Dapeng Receiving Station”). Out of fish.
The growth and physiological indicators of the redfish and snapper species released during the trial period of this project were stable during the 40-day trial breeding observation period, and they have fully adapted to the breeding water environment. The annual output is expected to reach 100,000 kilograms.
The successful application of this demonstration project marks a new step for the domestic LNG industry in exploring new paths for green development and building a modern "ocean ranch."
According to reports, when liquefied natural gas is gasified and exported, a huge amount of cold energy will be discharged into seawater, causing a huge waste of energy.
The Dapeng receiving station is one of the receiving stations with the largest supply of liquefied natural gas in China. In 2023, the cold energy processing capacity of the station will exceed 8 million tons.
Hao Yunfeng, president of Guangdong Dapeng Liquefied Natural Gas Co., Ltd., said that after heat exchange between liquefied natural gas and seawater, the seawater temperature will drop by about 5°C. It is generally maintained between 15°C and 25°C depending on the season, which is very suitable for the growth of fish with high economic value. It is a very scarce cold water resource in the southern seas.
CNOOC innovatively utilizes cold energy resources to build a modern cold energy breeding area within the LNG receiving station.
This project has established a scientific and three-dimensional circulating living water breeding system, and the entire process will not cause damage to the marine environment.
It is understood that the CNOOC cold energy utilization technical team carried out technical monitoring of the entire life cycle of this breeding test project, and conducted a large number of breeding process simulations to address issues such as unstable cold drainage volume of the open-frame gasifier at the receiving station. Select the optimal cooling technology.
At the same time, considering the sensitivity of high economic value cold-water fish to water temperature, the technical team developed a water temperature control system based on liquefied natural gas cold energy and designed a more applicable in-station cold energy breeding transformation design plan.
According to Cao Yueming, secretary-general of the Seed Industry Branch of the Shenzhen Aquaculture Industry Association, seafood grown in low-temperature seawater at the Dapeng receiving station does not need to be put into any fish medicine or other additives, which can ensure the high quality of the seafood.
The economic benefits of the pilot project are considerable. The market price of this batch of high-value seafood is more than 100 yuan per catty. The overall cost of cold energy breeding can be reduced by 30%.
The environmental benefits generated by the project are also significant.
It is estimated that reducing the temperature of 1 cubic meter of seawater by 5°C consumes 5.8 kilowatts of energy. The cold energy used by the breeding project is equivalent to saving 1.97 million kilowatt hours of electricity and reducing 1,800 tons of carbon dioxide emissions for society every year.
(Science and Technology Daily)