In the vast East China Sea in the northeastern part of Zhejiang Province, 63 wind turbines opened their arms and danced in the wind. This is the first offshore wind farm developed and built by Guodian Power Development Co., Ltd. It is also the first offshore wind farm in China to use a high-capacity foundation.
On April 12, 2019, it lasted 27 months and 11 days. The total installed capacity of 252,000 kilowatts of Guodian Power Zhejiang Zhoushan Offshore Wind Power Company Putuo No. 6 offshore wind farm was completed and put into operation. The sea of the East China Sea has been continuously transported to thousands of clean air. Ten thousand households.
On March 29, 2017, the Zhoushan Offshore Wind Power Project started construction. On December 14, the same year, the first wind turbine was successfully connected to the grid. The project is designed to use 3052 hours of hours. It is estimated that the annual on-grid power generation will be nearly 770 million kWh, which can be used by nearly 350,000 households for one year, and will not cause any pollution. It can also save 240,000 tons of standard coal per year. Carbon dioxide is 610,000 tons, sulfur dioxide is 4,378 tons, nitrogen dioxide is 1,751 tons, soot is 22,000 tons, and water conservation is 2.1 million tons.
In 2007, China’s offshore wind power started. Ten years later, there have been hundreds of offshore wind turbines in the southeast coast.
At that time, with the development of offshore wind power technology, and the strong technical support provided by the Group and Guodian Power in wind power development, we have strengthened our green development path of new energy transformation. Qian Zhongwen, general manager of Guodian Power Zhejiang Branch, said.
In December 2009, Zhejiang Branch and Zhoushan Putuo District People’s Government signed a cooperation agreement to determine the development of offshore wind power projects in the Liuheng sea area of Putuo District, Zhoushan City.
Xu Yong, general manager of Zhejiang Zhoushan Offshore Wind Power Co., Ltd., is also the chief commander of the project. In his office, the wall is covered with dense construction drawings, and one of the project schematics is striking. “Look, the sea area of our wind turbine layout is a heptagon. Each side has its own particularity.”
Zhejiang Province is rich in marine resources, and its navigation channels are intensive and scattered. It is hard to imagine the difficulty of enlisting offshore wind power in the waters of “Jiulong Water Control”.
“At that time, there were few domestic offshore wind power projects. There is no mature experience to learn from. We will study on our own, buy books, buy drawings, and see all relevant laws and regulations. It can be said that it is a method of cracking with a magnifying glass.”
“We are proud of our team’s rich experience in power plant operation management, and the ‘three thousand’ hard work! Especially hard.”
On June 30, 2011, the State Council approved the establishment of the Zhejiang Zhoushan Islands New District. In 2012, the planning and construction of Zhoushan New District started. With the support of the national “Twelfth Five-Year Plan” for offshore wind power, the builders’ early communication and unremitting efforts have finally achieved results and stood out among many competitors. In December 2012, the Putuo No. 6 project successfully obtained the “Energy Plan” of the National Energy Administration. “, became the first offshore wind power project in Zhejiang Province to obtain roads.
In December 2013, the project was approved by the Zhejiang Provincial Development and Reform Commission, and Zhejiang Zhoushan Offshore Wind Power Development Co., Ltd. became the leader in the construction of offshore wind power in Zhejiang.
“In January 2014, the leaders of the group company came to the site for investigation and asked us to do a good job in the preliminary assessment and analysis of offshore wind power projects, actively reserve resources and occupy the market.”
“The group company has high hopes for project construction. In 2015, the leaders of the group company stressed during the on-site investigation that it is necessary to make a strong offshore wind power project and set a new benchmark for the Group’s offshore wind power development!”
In 2016, the project successfully passed the group company’s investment decision and start-up decision. The blueprint is drawn, and the project has achieved breakthrough progress once and for all, shouldering the mission of the times and trusting. The confidence of the builders in starting a business is more firm: “We must stand on the forefront, not afraid of hardships and struggle to move forward!”
Despite catching up with the fast lane of large-scale industrialization of China’s offshore wind power, the construction of wind power in this sea area in the eastern part of the motherland is everywhere.
The wind sweeps over the blades, causing the long blades to rotate slowly, and the wind forms a new airflow at the end of the blades. The airflow distribution around the fan changes, and this effect is called “wake impact”. Among the many offshore wind farms put into operation in China, the average wake impact coefficient of general wind turbines is about 10%.
The model of Zhoushan offshore wind turbine is Siemens SWT-130, with a height of 90 meters and a blade length of 63.45 meters. The utilization efficiency of the wind resources in the field directly affects the future income. As an important part of the design of wind farms, the rationality of micro-site selection of wind turbines is a major issue faced by engineers.
“At the time, the design institute proposed a traditional ‘matrix’ layout scheme. The biggest problem with this arrangement was the large influence of the wake. At that time, we proposed two rows of north and south layouts, which reduced the distance between the fan and the fan, opened the line spacing, and reduced the wake. influences.”
According to calculations, the newly improved layout scheme, the influence coefficient of the wake of each fan of the same model fell to 6.3%, which set a new record for the impact of the wake of domestic offshore wind turbines at that time.
If 63 wind turbines generate 750 million kWh of electricity per year, a 3% reduction in the wake impact factor means that 22.5 million kWh of electricity can be generated, and 22.5 million pure electric private cars can be used for 26,000 kilometers, equivalent to one lap around the equator. many.
Under the seemingly calm sea, there is still a strong disturbance of “swelling waves”. “Wave” is the wave generated by the offshore wind blowing over the sea surface, often with a relatively short wavelength. The “surge” is similar to the wind far away, pushing the mountain to travel at sea. It may seem calm and calm near the sea, but the wavelength is large and the range is wide. It lasts for a long time. When the swells flow through the platform, it will have a huge impact on the pile foundation. If the design is not proper, the more than 500 tons of wind turbines are likely to be uprooted.
Not only that, the Zhoushan Liuheng coastal, the seabed geology belongs to the paste-like silt and silt-like geology, only the thickness of the silt layer, there are more than 10 stories. To piling here, it is like inserting chopsticks on tofu. The difficulty can be imagined.
How to build a wind turbine in this special sea area? “Improving the pull-out resistance is the key. The typhoon swept the waves and produced nearly 2,000 tons of floating force on the bottom of the platform. Although wind power technology has developed rapidly, various wind turbine foundations are designed and applied, but at present There are programs that meet our requirements but not.”
In this regard, the builders continue to self-pressurize and carry out monitoring for two years in this sea area. They have repeatedly studied and discussed with the design institutes and construction experts, and repeatedly optimized and creatively proposed the “basis of improvement of high piles and high piles”. On the basis of the original multi-pile high-bearing platform, taking full account of the influence of many factors such as the historical maximum wave height, the base plane of the cap is raised from the original 10.5 meters to 12.5 meters. This measure has greatly improved the safety of the pile foundation and reduced the construction cost by nearly 200 million yuan.
The high-rise platform with a height of 12.5 meters can not only resist the five-story high waves, but also become the highest platform in the history of China’s offshore wind power development.
In recent years, affected by the El Niño phenomenon, the typhoon affecting the Zhoushan sea area has been stronger than the previous year.
In 2018, there were 12 typhoons affecting the Zhoushan sea area. Wind is more than a gospel for wind turbines, but not for offshore wind projects under construction.
Offshore wind power has obvious advantages in promoting local economic development and optimizing energy layout. However, in response to the severe climate, it will not affect the life of maritime and local fishermen in extreme conditions, and provide reliable use of electricity for the society. The focus of attention.
“Our fans have automatic yaw function. When the wind speed exceeds 25 meters per second, the blades automatically stop rotating, the machine head turns to the windward side, and the blades turn to the direction that matches the wind, reducing the impact of the typhoon on the fan. This set of functions is normally used and must be guaranteed to supply power to the yaw motor.”
Xu Yong, who has 30 years of experience in thermal power operation management, boldly proposed the “big island” operation plan. Two diesel generators are built, which are self-starting in the case of system power failure, ensuring the power supply of the yaw heating of the fan.
In order to ensure the effective operation of the scheme, the builders also considered the characteristics of the typhoon and optimized the blinds of the diesel generator room. During the typhoon, the engine room was well ventilated and was not affected by the flood irrigation.
In September 2017, the first wind turbine of the project entered the hoisting stage, next to the 14-meter-diameter platform, Donghaigong No. 7 lifted the ship, and more than 700 tons of wind turbines were hoisted in the 12km offshore waters. On the stage.
Because the hoisting ship will sway with the waves, it can’t be fixed by itself, and then it can be used to lift and hold thousands of tons of giants and achieve precise installation, which is very difficult. At the same time, we must wait for the “time”. The sea conditions in the construction sea area are changeable, and the current trend is irregular. The 8th-level gusts from the Pacific Ocean can form a swell that affects the construction, and the timing is fleeting. According to statistics, in August 2018, the construction time was only 5 days.
Since there is no “time and place”, then make a fuss about “people and”. Clever engineers, did not stop the pace of construction for a moment, in order to do their best to race with the “wind”, rushing progress, they strive to explore and continuously improve the efficiency of installation.
In order to solve the lifting problem, the builders first dragged the transport ship and the lifting ship to the relatively stable sea area to complete the lifting, and then mounted the fan to the designated platform, and created the “overloading of the weight-bearing air-type fan” method. Innovation has inserted wings for the construction of Zhoushan offshore wind power.
The company’s innovative safety management model has formulated the “Safety and Civilization Measures Standard for Offshore Wind Power Construction”, which links safety investment with construction benefits, and requires construction units to ensure safety measures for labor and materials in the construction of the project, and at the same time formulate costs. Entries are listed to ensure that “funds are used on the cutting edge”. Up to now, the company’s safety zero accident has established a new benchmark for domestic offshore construction safety management.
The company initiated the “design supervision double acceptance” management system, and included the engineering inspection batch, division, sub-item, unit project acceptance and so on into the double acceptance system. All the acceptance projects involving the sea require the designer to participate and let the painter Go to the site to confirm whether the high-quality construction according to the drawings ensures that the design intention runs through the entire construction process and each construction link. The acceptance rate of the sub-projects of the project reached 100%.
The company creatively proposed the “long wave static and static construction platform”, and set up an auxiliary platform on the side of the wind turbine platform to transform the offshore construction into “onshore” construction, which improved the safety factor and artificially increased the number of working days.
As a construction method is applied to practice, work efficiency is greatly improved. On March 31, 2019, after more than 27 months of intense construction, the construction of the Putuo No. 6 Zone 2 project was completed.
On July 20, 2018, the dark clouds of the East China Sea covered the sky, and the typhoon “Anbi” wrapped up in the storm, and went straight to Zhejiang, where the sea was raging. After the typhoon, the offshore wind farm equipment and facilities under construction are safe and sound.
In the first half of the month, the builders of offshore wind power successfully completed the hoisting of two wind turbines and the laying of the first line between the offshore booster station and the first wind turbine of the No. 44 wind turbine using two window intervals of only four days.
During the construction of the project, the offshore wind power people explored a unique response plan, and opened the company’s “Putuo Wind Farm Flood Control and Anti-Taiwan Emergency Disposal Plan” and “Putuo Wind Farm Fan Typhoon Mode Operation Plan”, how to respond, how to The operation, the language is concise, the records are clear, and more than half of the engineers involved in the preparation of the program are after 90.
“Human resources are the first resource for enterprise development. At the beginning of the project, Guodian Power proposed “three ones”, requiring us not only to do a good project, summing up a set of experience, but also bringing out a team.”
“Red is the fan that is being repaired, blue is the fan that is put into operation, and these grays are not yet put into operation. When the wind speed exceeds 3 meters per second, these fans will turn…” Coffering in the west of Liuheng Island District, a brand new operation and maintenance support base has been completed. In the centralized control room, young employees are confidently monitoring the operation and maintenance of the fans.
Liuheng Island is surrounded by the sea and the ferry is the only means of transport to the island. Every March-May, the island is foggy, and it is common to encounter a closed air. The island’s humid climate and inconvenient transportation have become a major problem for young employees. Some college students who have just been assigned have resigned.
Wu Sanhong, secretary of the company’s party committee, said with emotion: “Here, employees who have worked for 3 years can compete for supervisors or valuers, pass the exam, and combine the results of the previous three years, with a total score of 85 or more. If there are not enough positions Don’t worry, they not only enjoy the same treatment as the new position, but also have the qualification to apply for a higher level position.” The system guarantees that young people see hope, and more and more young people like this piece. sea.
With a towering wind turbine standing on the sea, the employees of Zhoushan Offshore Wind Power Company also thrived. Two of them were rated as senior experts of Guodian Power, and two of them entered Guodian Power’s “Youth Talents”, one of them. It has also been rated as a high-level talent in the Zhoushan Islands New District of Zhejiang Province. Two college students who joined the post in 2013 took the middle management position.
Sunrise East, above the East China Sea, a row of new wind turbines stand on the tide. Today, the pursuit of dreams at sea has become a reality. In the future, this group of sea dream catchers will continue to uphold the entrepreneurial spirit of hard work and hard work, and live up to the new mission of the National Energy Group and Guodian Power to build a million kilowatt offshore wind power group in the vast East China Sea.