In June 29th, China fully designed and built the largest diameter of 160 thousand cubic meters of LNG (liquefied natural gas) storage tank, successfully achieved air jacking operation. The "top up" operation, the use of 5 China's proprietary technology, breaking foreign technical monopoly, to fill China's technical gaps in the field, the development of China's LNG industry milestone.
The tank is the core part of Tianjin LNG project, located in Binhai, by CNOOC Tianjin LNG Limited liability company investment Offshore Oil Engineering Corp, general contracting construction, gas and power group technology R & D center to provide the core technology.
LNG storage tank is the core equipment of LNG receiving station and the largest monomer facility for investment. The top tank capacity of 160 thousand cubic meters, 84 meters in diameter (the current domestic equivalent volume of the largest), 52 meters high, tanks can be stacked three Boeing 777 large passenger aircraft.
The top pressure operation is the use of closed space and external pressure difference principle, will slowly from the bottom of the tank dome to ascend to the top of tank predetermined position, this is the difficulty of LNG tank project risk and maximize the highest project node. Its successful completion indicates that the main structure of the storage tank is basically shaped and fully enters the tank and tank top construction operations.
The dome weighs about 700 tons from the top to the ground with a pressure altitude of 50 meters, the equivalent of a "great Shift of the universe". In the past, the operation of LNG tank pressure ceiling operation was generally referred to foreign practices, and there were few detailed calculations and analyses. The air lift operations by CNOOC China independent intellectual property rights "tank top gas dome construction design and monitoring software of calculation and analysis, the first domestic pressure lift connection design and construction of dynamic pressure rise, can fully guarantee the safety and reliability of the top. In the construction process, the use of professional characteristics between the dome and the outer wall can form a relatively closed space, the use of air blower to the tank dome following closed space continuously conveying a certain amount of low pressure air, make the tank in overcoming gravity and friction between the case and the outer wall of the design height according to a predetermined path to the steady rise of steel structure and the top. With the implementation of tank top pressure ring connection.
In 2006, China's first Sino foreign joint venture LNG receiving station was completed and put into operation. After 10 years, Chinese CNOOC to increase the LNG technology in the field of scientific research, has overcome the low temperature and mechanical coupling of nearly 40 technical problems, the first in China to fully grasp the full capacity of core patented technology of large LNG storage tank, and the formation of independent brand CGTank. The core technology includes 30 patents, more than 10 software copyrights, more than 20 kinds of special algorithms and solutions, covering 30 thousand cubic meters to 270 thousand cubic meters of the full range of LNG full containment tank, of which 9 technology to fill the domestic blank, tank three-dimensional model and multi point contact finite element calculation technology is a world first, reach the world leading level.
Large LNG full tank technology breakthrough, cracked the LNG full tank cost of the "black box", so that the cost of a single tank construction decreased by about 1/3. The technology to promote domestic LNG storage tank construction, management and operation ability, to optimize the domestic tank equipment, material manufacturing industry upgrade, the LNG industry in China to complete the "manufacturing power" to "great wisdom made" gorgeous turn.
At present, Chinese CNOOC has been built including 8 LNG in Guangdong, Fujian, Tianjin, Shanghai, Zhejiang and Hainan and other places of the receiving station, the annual reception capacity of more than 30 million tons. Shenzhen LNG is also about to go into operation, and LNG and LNG in Zhangzhou are under construction and construction in Guangxi. By the end of 2016, total imports of LNG China oil output exceeded 1 tons, accounting for nearly 80% of the total imports of LNG. At present, Chinese CNOOC has been formed from natural gas exploration and development to the use of LNG cold energy complete industrial chain.
As one of the earliest and largest LNG importers in China, the gas and electricity group has continued to provide clean energy for more than 11 years in China's coastal areas. Tianjin LNG construction, will further enhance the gas and electricity group's LNG clean energy supply capacity, to promote the coordinated development of Beijing, Tianjin and provide more support.
Tianjin LNG alternative storage tank project is expected to be completed by the end of 2018. After the project is completed, it will provide 2 million 200 thousand tons of liquefied natural gas annually, which will effectively protect the clean energy supply in Beijing, Tianjin and hebei.