China will enter the "renewable energy era" in this century.
yesterday, the eighth annual Youth Academic Conference in Nanjing, which lasted for more than one month, kicked off. The first theme report was given by Xu Jianzhong, an academician of the Chinese Academy of Sciences and a researcher of the Institute of engineering thermal physics of the Chinese Academy of Sciences. "With the rapid development of economy and society, the contradiction between energy supply and demand is becoming more and more prominent. In order to ensure a faster development speed, without polluting the environment, and saving resources and energy, we must establish a sustainable, carbon free or low-carbon energy system, but this requires decades of efforts." Xu Jianzhong said
by the end of this century, China is expected to build a carbon free or low-carbon energy system
Xu Jianzhong said that China's medium and long-term scientific and technological development plan has listed the energy of the new figure 7 Goldilocks spray free material rendering as the first priority area
at present, the use of conventional fossil energy emits a large amount of greenhouse gases such as carbon dioxide, which intensifies global warming and poses a serious threat to the future development of mankind. Xu Jianzhong pointed out that climate warming has led to significant changes in the distribution of vegetation types, the eastward distribution of grasslands and deserts, the expansion of small parts of the heavy load and high-altitude areas, the gradual rise of sea level, and endangering the production of agriculture. "The first choice to deal with these hazards is to vigorously develop low-carbon economy and low-carbon technology, and gradually change the energy structure and lifestyle."
"in China's current energy system, fossil energy such as coal and oil account for more than 80%. We hope that through our efforts, renewable energy such as natural gas, nuclear power, solar energy and wind energy will 'share the world' with fossil energy in the middle of this century; by the end of this century, a carbon free or low-carbon energy system dominated by renewable energy will be established, truly entering the era of renewable energy." Xu Jianzhong said that by then, the whole process of energy production, transportation and use will be in a carbon free or low-carbon state, and the efficiency of energy use will be greatly improved
economically developed regions can take the lead in developing "distributed energy system"
Xu Jianzhong said that the construction of a carbon free and low-carbon "renewable energy" system should not only adapt to the dispersion of renewable energy, but also provide guarantee for the development of large industry and protect the ecological environment. Therefore, he suggested that cities in the future use a new "distributed energy system"
"distributed energy system is an energy system established in a certain area. It is composed of power generation, heating and cooling systems. The energy is divided into high, medium and low, which can realize the combined supply of 'cold, heat and electricity' and the cascade utilization of energy." Xu Jianzhong said that this system has changed the existing centralized energy transmission mode such as high-voltage transmission, but distributes energy evenly according to demand. Therefore, there is no need for facilities such as high-voltage substations. The system can be built near users and used by itself when necessary, which can effectively alleviate the current situation of "congestion" in energy transmission
it is understood that at present, Beijing, Shanghai, Guangzhou and other cities have built distributed energy demonstration sites. In Guangzhou University Town, through the cascade utilization of energy, the distributed energy station has achieved a comprehensive energy utilization efficiency of 78%, and the exhaust gas temperature of waste heat boiler has also been reduced from 140 ℃ to about 90 ℃, greatly reducing the negative impact on the environment. Xu Jianzhong said that this technology has huge room for improvement and market application potential, and economically developed regions should take the lead in encouraging development
Jiangsu should focus on the development of land-based wind power
as an important low-carbon and renewable energy, wind power has been widely used in China in recent years. Xu Jianzhong revealed that China's current installed capacity of wind power has surpassed Germany, ranking second in the world, second only to the United States. The development of wind power in China has been scheduled. By 2020, the total installed capacity of wind farms developed on a large scale along the coast and inland will exceed 150million kW. By 2030, it will reach the importance of fixtures in the test machine of 200million-300million kW. By 2050, it is expected to reach 500million-800million kw
Xu Jianzhong said that all low-carbon technology development should be adapted to the actual situation in China, as well as wind power technology. "For example, there is much sand and dust in northern cities of China. When sand particles strike the surface of wind turbine blades, they will cause pits and attach pollutants. At present, researchers have applied the principle of shark skin bionics to effectively use the pits on the surface of blades, reduce resistance and improve performance. In addition, scientists have also developed 'smart blades', which reduce wind power by reducing load, reducing materials, reducing maintenance and improving the reliability of wind turbines The cost of generating electricity. "
at present, European countries have put drifting wind turbines on the sea, and Jiangsu also has a long coastline. Is the time ripe to develop offshore wind power generation? Xu Jianzhong said that the whole world is watching this new technology. Most of the wind turbines along the coast are installed in the interval with good sealing effect. To overcome the corrosion of sediment and sea water, and to really 'collect wind' on the sea, more technical problems need to be solved. He suggested that the focus of wind energy development in Jiangsu should first be on land-based wind power plants with relatively mature technology
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