【Major Equipment in the Chemical Engineering Sector】501 — The upper module of the Jieyang Shenquan II offshore pressure station, weighing 3,365 tons, from 2022
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The last edit to this post was made by Desert Fish on 2022-8-21 at 10:28. At 7:52 p.m. on August 15, the 3,365-ton \"heart of electricity\" – the upper module of the **EPC Jieyang Shenquan II Offshore Step-up Substation – was accurately installed on the jacket, laying a solid foundation for the connection of the first power units to the grid in September. Offshore step-up substations are key facilities for power transmission and distribution in offshore wind power projects; they serve as the centers where electrical energy from entire offshore wind farms is gathered. Acting as important transfer stations that connect offshore wind farms to the onshore power grid, they play a crucial role in collecting the electrical energy generated by offshore wind turbines and transmitting it at elevated voltage to the onshore power grid. Among them, the upper block is arranged in an integrated layout with a total of four floors; it consists of systems such as electrical, communication, HVAC, and fire protection, and its dimensions are 40m in length, 36m in width, and 27m in height. It is reported that the installation was carried out using a modular lifting beam system on the construction vessel \"Huaxi 5000\", via single-hook floating lifting; once in place, the highest point was at approximately 40 meters above sea level.
It is understood that the sea area where the Jieyang Shenquan II offshore wind power project is located features deep waters and strong currents, a short construction period, as well as frequent typhoons – all of which pose significant challenges to selecting the appropriate construction vessels and carrying out the installation work. Faced with numerous challenges, the Party member task force for Project Shenquan 2 kept a close eye on the daily weather forecasts, and made thorough preparations for the arrival of the vessels and machinery, conducted safety inspections prior to construction, and planned the lifting procedures. Special personnel were stationed on board to ensure the safety of the crew and the ship’s machinery, taking advantage of the optimal time for operations at sea. Careful plans were made to position the ship in the right location, and coordination was established between the main crane and the transport vessel to enable the precise placement of the upper components. Work on cutting the first batch of steel plates for this power station’s upper components began on February 16; high-standard manufacturing and testing were completed by July 31, and the components were successfully installed on August 15. This achievement set a new record for offshore wind projects of 500MW or more, with the upper components of such stations being installed within just 6 months.
On July 1, the jacket foundations for the offshore substation of the **Dian Tou Jieyang Shenquan II offshore wind project, as well as the first batch of tower barrels for the 11MW turbines in Section I, were shipped on the same day. This marks another significant milestone achieved in the Shenquan II project, creating favorable conditions for the first turbines of this project to be connected to the grid in September. It is reported that the jacket for Project Shenquan 2 is 56.8 meters high, 32.26 meters long, 28.96 meters wide, and weighs 2,800 tons. With all the steel plates arriving on May 25 and the conditions for shipment being met on June 30, the completion of the jacket demonstrated the excellent construction organization and management skills of all the parties involved in the Shenquan II project. It also set an industry record, with the jacket for an offshore step-up substation with a capacity of over 500,000 units being manufactured in just 35 days.
On June 5, the final structural closure of the **Dian Tou Jieyang Shenquan No. 2 Offshore Step-up Substation was successfully completed.
Once completed and put into operation, the project will set a new record for the shortest time required for offshore wind power construction in China. It can generate 1.743 billion kWh of electricity per year, saving 527,300 tons of standard coal consumption and reducing carbon dioxide emissions by approximately 1.4029 million tons.
**The expansion project for the EDP Jieyang Shenquan II 350MW offshore wind power project is located in the waters to the south of Shenquan Town, Huilei County, Jieyang City, with a planned total installed capacity of 502MW. The reporter learned that this project is the first wind power project in China to be constructed with a single-turbine capacity of over 10 MW. Innovations have been made in both the process of driving piles and the installation of turbines, which will help accumulate experience for the construction of large-scale offshore wind power projects in China.
Among them, the 35# single pile that is being constructed has a length of 112.68 meters, a weight of 2,407.5 tons, and a maximum diameter of 10.4 meters. It is the heaviest and largest-diameter single pile in China to date, and it will set a new national record for single piles. The project utilizes large-diameter single-pile technology, which offers advantages such as reliable structure, short construction time, easy transportation, and high construction efficiency, thereby ensuring the successful completion of the commissioning target by the end of the year. In this project, the wind farms are connected to the offshore step-up substation via 66kV collection lines; compared with traditional 35kV submarine cables, this reduces consumption by 30% and power loss by 60%, thereby lowering construction costs and improving construction efficiency, while also enhancing the economic efficiency of plant operation.
“\"Nengjian Guanghuo 001\": The Debut of the Dongguang Offshore Wind Farm
The upper module of the step-up substation in the Jieyang Qianzhan Shenquan offshore wind power project serves as an important \"link\" between the offshore wind turbines and the onshore control center; it plays a key role in collecting the electrical energy generated by the offshore turbines, stepping up its voltage, and transmitting it to the power grid via the onshore control center. The construction of the upper module of the first-phase offshore step-up substation, which was lifted in 2021, was carried out through overall construction on land followed by integrated lifting at sea. The entire upper module is arranged in five layers, with a planar dimension of approximately 47 meters × 35.4 meters and a height of around 24 meters; the top layer is located at about 46 meters above average sea level. It weighs around 2,800 tons, making it the tallest and heaviest single offshore step-up substation in Asia to date.