As a milestone in the industrialization of CSP, the first-phase 10MW project of the Delingha 50MW solar thermal power plant in Qinghai was formally connected to the grid for power generation. This is China's first solar thermal power generation project that has entered industrial operation. It is of great significance to the CSP industry that has not been able to start large-scale startup.
Since solar thermal power generation started many years ago, why hasn't the first fruit been formed until today? When will it enter the stage of scale development? What is the specific operation of the Delingha Project in Qinghai? Is the widely-available light and heat on-grid tariff confirmed? On August 9, the reporter interviewed Zhong Guoqing, president of Zhejiang Zhongkong Solar Energy Technology Co., Ltd., who invested in the construction of the Delingha Project in Qinghai.
Four issues need to be solved for large-scale development
Reporter: Compared with photovoltaic power generation, CSP power generation has the advantages of friendly grid connection, stable power generation, and continuous heat storage. However, in the promotion and application of CSP, it has always been behind photovoltaic power generation, and the contrast is relatively large. How do you view the current development of the CSP industry? How can we enter the stage of scale development?
Zhong Guoqing: In general, China's solar thermal power generation is in the industrial formation period, that is, the initial stage of industrialization. No matter whether it is a product (equipment) or a system that has not yet reached scale development, there is still a lot of work to be done to enter into a large-scale development. First, the government should introduce effective incentive policies, of which the on-grid tariff policy is the most crucial. Solar thermal power generation is consistent with other forms of renewable energy power generation. The cost is higher than that of traditional power generation methods. It requires government policy support. The rapid development of wind power and photovoltaic power generation in China is realized after the introduction of the price policy; Second, establish a sound solar thermal system. Power station site selection technology support system to achieve a certain scale of demonstration; Third, establish and improve the entire process of design, construction, commissioning and operation of the power plant standard system; Fourth, enterprises should speed up the core technology of collecting light, heat collection, heat storage Improving the overall system design and integration capability of the power station, realizing the localization of key equipment across the board, and reducing the power generation cost of the power station.
With the joint efforts of the government and enterprises, through experience in the construction and operation of certain scale demonstration projects, the company will increase the core technology level of large-scale power plants and equipment manufacturing capabilities, and reduce the cost of power generation. China's light and heat industry will enter a stage of large-scale development.
Reporter: How do you view the future of CSP in China?
Zhong Guoqing: Actively using solar energy, vigorously developing the CSP industry is the only way to prevent and control air pollution, control haze, and realize a beautiful Chinese dream. With the completion of the “12th Five Year Plan†target installed capacity, the demonstration effect will be achieved. The thermal industry will enter a stage of rapid development. China is a big manufacturing country. At the same time as technological innovation and industrial scale expansion, it is easier for China to reduce the cost of power plants and become a leader in the global solar thermal power generation business.
Cost can be controlled within 15,000 yuan / kilowatt
Reporter: To the Delingha project, please describe the specific conditions for the construction and grid connection. What difficulties are encountered in the middle and how is it solved?
Zhong Guoqing: As the first large-scale commercialized CSP station in China, we encountered a lot of difficulties in the construction process, such as the harsh environment, the impact of dust on the mirror cleanliness, lack of skilled workers, high labor costs, and special climate environment. This led to a long construction period, poor infrastructure conditions, and no ready-made power output corridors at the site of the site.
Last year we experienced nine gales. The measured wind speed reached 16 to 17 meters per second. In winter, it has to withstand the test of minus 30 degrees Celsius. The sand and low temperatures all place high demands on the wind resistance, low temperature resistance, and heat insulation of our equipment such as heliostats and heat pipes. For this reason, all our equipment are designed to meet the requirements of high reliability and professional antifreeze. And thermal design; in the face of sand and dust impact on the mirror cleanliness, we are developing cleaning robots that can implement automatic tracking, driverless, nighttime operations; because there is no ready-made power output corridor at the site, so one At the initial stage of completion of the project, we faced the issue of access system construction. However, with the strong support of the governments of Qinghai Province and Qinghai Power Grid, we have completed the construction of the access system and successfully connected to the grid for power generation.
Reporter: Has the issue of the on-grid tariff of the Delingha project been made clear, and if it has a cost advantage compared to photovoltaic power generation, when can it recover the cost?
Zhong Guoqing: The online price of Delingha project has not yet been clarified. Due to the current overall size of CSP and the lack of scale effect, the cost of CSP is temporarily higher than that of PV. However, there is no major breakthrough in the core technology of photovoltaic power generation, which has become a “bottleneck†for its cost reduction. The space and rate of decline in the cost of solar thermal power generation are large, and the cost reduction will be directly promoted through technological progress and design optimization. At the same time, heliostats, control systems, large-scale production of heat transfer media, scale-up of heat storage systems, mass production of thermal equipment, and large-scale production of steam turbine power generation systems can also effectively reduce system costs. Increasing the installed capacity of solar thermal power stations and developing 100 megawatt-class power stations will significantly reduce investment costs. According to the current estimation of the control engineering practice, after cost optimization, we can control the cost of the power station within 15,000 yuan/kilowatt. With technological progress and industrial scale expansion, it is expected to drop below 10,000 yuan/kw in the next few years. Photovoltaics is even lower.
Complementary to conventional power stations is the future trend
Reporter: What are the long-term plans for Central Control to promote the utilization of CSP?
Zhong Guoqing: In the next period of time, we will continue to tackle difficulties and technological innovation through the construction of the project to further reduce the cost. At the same time, CSP is not limited to pure CSP, it can easily be combined with conventional conventional power plants, such as solar-coal complementary power generation, solar-gas-fired complementary power generation, and so on. Sun Island can also provide various parameters of steam, has a wide range of applications in various fields, such as industrial steam supply, desalination, steam drive oil production, urban heating. Therefore, we will continue to actively explore and innovate to promote the diversified development of the light and heat utilization industry.
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