On November 7th, as the impeller completed a smooth turn over and accurately docked to the flange surface of the engine room, Energy China GPEC used the "Huwei" installation platform successfully completed the first wind turbine hoisting in the Huadian Yangjiang Qingzhou No.3 500MW offshore wind power project. The "Huwei" installation platform was the first offshore platform retrofit program done in China.
The successful completion of the hoisting of the first wind turbine to the installation platform is another major innovation and breakthrough by the company's offshore wind power engineering team in this field. It not only accelerated the construction of the wind turbine installation, but also provided an innovative example of the installation and construction of offshore wind turbines in China's deepwater region.
The advantage of the "Huwei" installation platform is that it was modified and retrofitted from the "H194" offshore oil platform. It took advantage of the oil platform's deep-sea operation capabilities, and met the positioning and operation requirements in deeper seas. It was well equipped, with a "DP1" dynamic positioning system, a 650-ton full-rotation offshore crane, and a double-sided auxiliary crane. It also boasts a strong hoisting ability with nearly 129-meter-long pile legs, large pile shoe area, and low pre-compression load of pile shoe unit. The mud-entry performance is better than most wind power installation platforms. More length of pile legs is available for deep water and lifting operations. It can be used for deeper and higher offshore wind turbine hoisting construction, which can meet the requirements of offshore wind turbines with water depths greater than 50 meters and 8.0 MW or more.
Huadian Yangjiang Qingzhou No.3 500MW offshore wind power project is located in a marine area with extremely complicated geological conditions and harsh sea conditions. The water depth of the project location is about 42 to 46 meters, the maximum thickness of the silt layer is 17 meters, and the hoisting height requirement of wind turbines needs to be 129 meters above the highest water surface is, and the lengths of the legs of the platform have to be at least 90 meters.
The project department acquired the "H194" oil platform in April 2021. After careful research and scientific analysis, the innovative plan of "revolving offshore crane + impeller assembly platform" was adopted to modify the oil platform and transform it into a deeper sea wind turbine installation platform with the ability to hoist offshore wind turbines, this is the "Huwei" wind turbine installation platform.
The project department attached great importance to the first hoisting operation of the wind turbine by the "Huwei" platform. Although the platform met the requirements for hoisting wind turbines under carrier conditions after its modification, problems such as limited deck pace might still affect the construction efficiency. In response to the above situation, the project department has carried out several discussions on the hoisting scheme, breaking through the inherent thinking of the double-machine hoisting scheme, and proposing the innovative schemes of single-machine hoisting of the tower and the blades, and complete turning of the impeller outboard. The new scheme optimized the efficiency of the construction of the retrofitted wind turbine installation platform.
At the same time, the on-site construction also adopted the high-precision DGPS positioning system and other special equipment to address the difficult problems of ship positioning, tower vertical transportation, blade leveling and unhooking, and impeller assembly turning over. The hoisting and installation of the first wind turbine (No. 17) by the installation platform marks the success of the “Energy China GPEC”retrofit platform wind turbine hoisting scheme, and provides a useful experience for the hoisting operation of the wind power installation platform in the deepwater area, and a solid guarantee for the efficient installation of subsequent turbines.
Huadian Yangjiang Qingzhou No.3 500MW offshore wind power project broke several records for such projects in China. It was the farthest from shore, with the deepest water depth, the largest single-unit capacity, the largest total installed capacity, and the maximum depth of silt layer of up to 17 meters. The project plans to build 67 offshore wind turbines with a single unit capacity of 6.8MW or 8.3MW, 1 offshore booster station, 220kV submarine cable, 35kV field collection submarine cable, an onshore centralized control center, and other projects. Once operational, it could provide about 1.5 billion kWh of clean electricity each year to the area, save 461,500 tons of standard coal, and reduce 435,500 tons of carbon dioxide emissions, 14.60 tons of dust, and 14,300 tons of ash. The social and economic benefits will be significant.
Energy China GPEC is responsible for the general contract for the construction of lot I of the project, including the basic construction, transportation, and offshore construction of 34 wind turbines, and the corresponding laying of 9-channel 35kV submarine cables; the installation of 35 wind turbines and ancillary equipment for the tower (20 sets of 6.8MW, 15 sets of 8.3 MW); foundation construction, transportation, and offshore construction of the offshore booster station; loading, transportation, and offshore installation of the upper block of the sea booster station; wind farm safety monitoring (8 wind turbines and offshore booster station foundation); and supporting temporary navigation mark projects, etc.
Since the start, the project department has been closely following the main schedule of project construction, bonded and closely cooperated with the owner and the participating units, rationally allocated resources, made full use of the offshore wind power construction window, optimized the construction plan, and strengthened the construction management to ensure safety under the premise of quality and safety. The construction of the project progressed quickly, and sub-units regularly reported many pieces of good news. Next, the project department will continue to focus on the goal of full capacity grid synchronization, go all out to speed up the progress, and make Energy China GPEC contribution to achieving the carbon peak and carbon neutral "30·60" target.