What about the most popular decommissioned fan

2022-07-25
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In 1989, Xinjiang Wind Energy Company purchased 13 power generation windmills with us $3.2 million donated by the Danish government, and established the largest wind power plant in Asia at that time in Dabancheng

in 2013, the paint on the outer walls of these fans began to fall off, and the towers turned yellow due to the leakage of oil stains, showing a drooping old state

what should be done with this batch of retired fans? At that time, the industry debated this issue endlessly

it is recommended to replace the parts for further use. However, it is difficult to find the spare parts. The previous batch of fans were produced earlier and the models were small. Compared with the later main models of 1.5-2.5 MW, the internal structure, tower and blades were very different, so it was difficult to maintain and replace, and the cost was very high

it is suggested to replace the large fan with the small one, that is, to replace the retired small fan directly with the blower. However, the replacement of fans involves many departments, the approval procedures are complicated, and the state has no relevant regulations. Applying for fan replacement is equivalent to going through the new project process. In the words of the owner, "it is better to develop a new wind farm directly". In addition, the replacement of large fans with small fans means that the electricity price subsidy will increase. Who will pay the extra subsidy from imitation to independent renovation? No answer

the reason behind the endless debate is that there is no precedent to learn from

by 2018, more and more wind farm owners will be confronted with the problems that Dabancheng wind farm once suffered

in the past, the large-scale development of wind power in China began in 2003. In 2003, China began to implement the wind power concession bidding project to determine the investors, developers and electricity prices of wind farms; In 2005, the renewable energy law and its detailed rules were adopted, establishing a stable cost sharing system. All these have stimulated and improved China's wind power development scale and local equipment manufacturing capacity. In the following five years from 2006 to 2010, China's wind power installed capacity achieved explosive growth

theoretically, the design service life of wind turbine and other equipment is about 20 years. According to this calculation, the units installed at the beginning of 2000 have also entered the "twilight years"

different from the 13 turbines in Dabancheng, after recent years' development, China's wind power operation and maintenance market has been established, and the foreign market has also provided reference ideas for the treatment of retired turbines. In the "twilight years", there are more fan options. Of course, the problems faced by the market are different

for renovation, the cost should be considered

the fans that will be retired can be renovated and transformed to usher in the "second spring"

renovation is to remove the old fan and replace it with a new unit. Transformation is to replace the old components or software system

the warranty period of wind turbine is mostly between 2-5 years, and the theoretical service life is about 20 years. In the long time after the warranty period, operation and maintenance has become the daily work of wind turbine. UL consulting company is currently carrying out the project of "residual life assessment of wind turbine generator set in the whole life cycle" to test the operation status of the unit and assess the risk of its failure. For key units with high risk of failure, after the main body and dynamometer are respectively moved to the concrete, parts can be replaced to extend the service life of the unit and reduce the amortization and depreciation of assets, so as to bring greater profits to the enterprise. According to Sutong, senior project engineer of UL China, there is a large demand for this project abroad, and the service life of the unit can be extended to 25 years on average. At present, this service is not available in China

as for the treatment of renovation, the owners generally reflect that they are most concerned about the cost performance

the domestic wind power market has only developed for more than 20 years. In the early stage, it basically relied on imports. In the later stage, most of the wind power technologies independently developed are copies of foreign control systems. At the same time, there is a certain gap between the domestic component manufacturing process and the international ones. The quality of mechanical components close to the retired units is difficult to meet the requirements of continuous operation. At the same time, the control system has no technical continuity, and the transformation cost is also very high

according to the current operation and maintenance market observation, there are three types of fans to be renovated: small fans that are close to the design life, small fans that have been used for 10-15 years, and 1.5MW fans with unsatisfactory operation conditions. Most of these wind turbines are located in the three north regions, suffering from the problem of wind curtailment, and facing the situation of bidding, it is difficult to predict whether the increased power generation can be converted into power generation income

recycling, blades are the focus

the second outlet for retired fans is recycling

among the five key components of the wind turbine, blades account for 15% of the cost of the whole machine, and one third of wind power accidents are caused by blades. In the recycling of fans, blades are the absolute focus

2012, the Netherlands took the lead in using retired wind turbine blades as structures for children's parks. Now, superusestudios, a Dutch design company, further uses the retired blades in urban buildings (such as public seats) and outdoor sheltered places (such as bus shelters)

this is obviously a very pleasant way to retire the blades. But let's first look at a set of data. At present, the cumulative installed capacity of wind power is 188million kW, the total number of blades exceeds 220000, and the blade radius has also increased from 25 meters in 1990 to 190 meters in 2015. It is obviously not feasible for such large quantities and large volumes of blades to be transformed into public buildings

fan blades are thermosetting composite materials, and the recovery treatment is very complex. According to caozhentao, director of circular economy Department of Jilin ChongTong Chengfei new materials Co., Ltd., the recycling of thermosetting composite materials is very complex. In Europe and America, Li Jian, the sales manager of Thermo Fisher Scientific (China) Co., Ltd., mostly uses centralized storage to wait for advanced and economical methods for further processing; A small part is treated by chemical recovery or incineration power generation. At present, it is treated by ordinary solid waste burying in China. These treatment methods have high cost, low efficiency, great harm to human beings and the environment, and bring defects to green and clean energy

the physical or chemical degradation and recycling of these potential "white pollutants" has become a research topic all over the world

one is recycling through chemical separation. In a research project called "dreamwind", a team of scientists from Aarhus University in Denmark is developing a chemical substance that will be possible to separate the composite materials of wind turbine blades, which is the main problem to solve the recycling of wind turbine blades

second, it can be shredded and reused. Washington State University is working with global glass fiber solutions (GFS) in Seattle to recycle and manufacture composite glass fiber materials for retired blades. GFS first cuts the wind turbine blades into palm sized pieces, and then researchers at Washington State University refine and process them into new composite materials. After testing, the team at Washington State University found that the new material can be comparable to many wood composite materials. The recovered blades can be used in different ways, from floor tiles to plastic pavement obstacles

third, it is used as fuel after crushing. At present, Germany maintains the world's only industrial scale factory for processing wind turbine blades. Just like the researchers at Washington State University, the decommissioned blades are first cut into small pieces, then crushed into fragments, and used together with other wastes as fuel for the cement plant

looking forward to policy support

in the same way that Dabancheng was not delivered offline to customers by Chinalco Luoyang Copper Co., Ltd. in recent years, with the continuous increase of wind power installed capacity, the proportion of wind power in power supply has been increasing, and the wind power operation and maintenance market has gradually matured. However, the treatment of blades has not been paid enough attention by relevant parties

environmental protection is a problem that the blade must face

in 2016 alone, China produced 12800 tons of solid waste materials in the production of wind turbine blades. By the end of 2017, the total output of thermosetting composites in China was about 21million tons, and the application of wind power blades accounted for 25%, reaching 5.25 million tons. The number of retired blades is also gradually increasing, and 59000 tons of retired blade waste will be generated in 2022

"one of the problems we are facing now is that people do not pay enough attention to blade treatment. I believe that in five years, people will pay more and more attention to this problem." caozhentao told us that this industry is facing the dual pressure of economy and environmental protection, and also looks forward to the further support of policies

the 13th five year plan for wind power development did not mention the decommissioning of wind turbines. At present, the decommissioning of wind turbines is under the jurisdiction of the local energy regulatory bureau. If a generator set has reached its designed service life, it shall apply to the local energy regulatory authority for decommissioning, and shall not continue to generate electricity. If the company fails to apply for decommissioning at the expiration of the period, the energy regulatory authority will publicize and cancel the license according to law. If the generator set complies with the national industrial policy and energy conservation and emission reduction policy and is not included in the shutdown or shutdown plan of the relevant government departments, if it is necessary to apply for continued operation, it shall apply to the local energy regulatory agency for continued operation 3 months before the expiration of the design life of the unit. If the wind turbine generator unit applies for continuous operation, it shall also carry out life extension transformation and safety assessment in accordance with relevant national and local regulations, and provide corresponding supporting materials

the disposal of decommissioned fans is a problem and an opportunity to stimulate market prospects. To grasp this opportunity, we need advanced technology and complete policies

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