Innovative China, with you feel the charm of light and heat technology!

Time:2019-10-17

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In September 2016, the National Energy Administration officially issued the ''Notice of the National Energy Administration on the Construction of Solar Thermal Power Generation Demonstration Projects'', determining the list of the first batch of 20 solar thermal power generation demonstration projects, including tower power stations, trough power stations and Fresnel Three technical routes of the power station, with a total installed capacity of 1.349 million kilowatts.

2017 is a year for photothermal people to sharpen their way forward. In this year, photothermal people set off a tide of development of commercial photothermal power stations, and several photothermal demonstration projects entered the substantive construction stage in this year.

In recent years, photothermal technology has attracted attention from all walks of life, and the first flight energy-saving and other projects have also been reported by major media. On January 23, 2018, in the "Innovative China" program broadcast by 9 documentary channels of CCTV, the first voyage energy-saving Dunhuang 10MW and 100MW molten salt tower projects were included.

 

 

Dunhuang, located on the edge of the Tengger Desert in western China. The annual sunshine hours reach more than 3000 hours, sunshine is the biggest "specialty" here ".

The secret of collecting sunlight lies in these mirrors. These huge mirrors are 115 square meters on each side. The sun has not yet appeared, now is the best time to clean them.

1525 mirrors surround a 138-meter-high heat collection device to form this photothermal power station.

Huang Wenbo, from southern Fujian, is the deputy commander of the Dunhuang Guangthermal Power Station.

In three years, he recorded the whole process of the power station from being a desert to the completion of construction.

The average daily operation time of the solar thermal power station is eight hours. When the sunshine intensity reaches the power generation standard, the engineer reflects and focuses the sunlight on the collector at the top of the tower by adjusting the angle of the mirror.

The concentrated sunlight can form a high temperature of more than one thousand degrees Celsius, and the collector transfers the heat to 5800 tons of molten salt under the tower. In the process of cooling the molten salt with water, a large amount of steam is generated, which drives the steam turbine to produce electricity.

Biweekly tracking technology allows mirrors to learn the skills of sunflowers. After programming, they can maintain the best reflection angle at all times as the sun shifts. Tracking accuracy can reach 0.03-0.05 degrees.

At the end of 2016, the Dunhuang 10 MW solar thermal power station was officially connected to the grid. It can provide 100 percent clean electricity to 30000 homes a year.

The most significant advantage of the Dunhuang Photothermal Power Station is after sunset.

Control room, the brain of the photothermal power station. The computer is performing an important operation, using the heat stored during the day to generate electricity. From light concentration, heat absorption, heat storage and heat exchange, the whole control is fully automatic.

Molten salt performs peak shaving like water and electricity during the day according to weather changes. At night, it generates electricity stably like a thermal power unit.

This is the first molten salt tower solar thermal power station in Asia and the third in the world that can continuously generate electricity for 24 hours.

Each heliostat, in addition to requiring ultra-high reflectivity, must also be able to withstand sand and hail. In the production workshop, the robots are in full operation. Their task this time is to 11000 multi-faceted heliostats.

Directly opposite the Dunhuang Guangthermal Power Station, the second phase of the project with an installed capacity of 100 megawatts is under construction, covering an area of 784 hectares. By the end of 2018, a giant energy position with an annual power generation of 0.35 billion degrees will be built here. 11000 mirrors and 260 meters high heat absorption tower, this is another landmark of Dunhuang.

Building devices to collect natural energy is the most feasible way to find clean energy at present. We spare no effort to improve their performance and make energy cleaner and more efficient.

On April 6, 2016, the first voyage energy-saving consortium won China's first commercial solar thermal power generation project, Guanghe Delingha 50MW trough solar thermal power generation project light field EPC general contract order, becoming the only domestic company with both tower and trough solar thermal power generation project performance.

At present, CGN Delingha 50MW heat transfer oil tank photothermal power station has basically completed the overall installation of Sun Island and successfully entered the heat transfer oil filling stage. This will become China's solar thermal power generation demonstration project in the first put into operation of the power station.

The photothermal power generation project is a project with new technology and large volume; it is also a typical project of talent-intensive, technology-intensive, and capital-intensive. The supply of resources is relatively concentrated, and continuous investment is required in technology, management, and capital. The construction of the first voyage energy-saving photothermal project verifies the molten salt tower and trough technology, which lays the foundation for China's photothermal integration and industrialization development, cultivated talents in photothermal design, manufacturing, engineering, operation and maintenance; accumulated experience in photothermal design, manufacturing, engineering, operation and maintenance; at the same time, it is used to test the performance of different equipment, accumulate operating parameters of different brands of equipment, train operators, accumulate experience for future projects, and cultivate domestic products.

(Part of the above content is selected from CCTV broadcast material)