Solar Power Plant in Haixi, China

Structures Analysed with Dlubal Software

  • Customer Project

Customer Project

In the Chinese province of Qinghai, near the city of Haixi, a complex of 23 multi-energy plants is being built, combining different technologies to generate energy from renewable resources. The complex comprises a 618.4-foot-high tower of the 50 MW solar power plant; the support structure is expected to be completed in mid-2019.The solar power plant uses modern CSP (Concentrated Solar Power) technology, which enables the storage of thermal solar energy, thus ensuring continuous power generation even at night.

Investor:

Luneng Group Co., Ltd.

Steel Structure Design:

Allcons Industry s.r.o.
www.allcons.cz

General Contractor

Shandong Electric Power Construction Corporation III (SEPCO III)

Technology Designer

Cockerill Maintenance & Ingenierie s.a. (CMI)

Tower Parameters

Model

Using a system consisting of hundreds of mirrors, the sunlight is concentrated in a receiver located at the top of the tower. At the receiver, the absorbed solar energy is converted into thermal energy by heating salt liquid (Molten Salt Liquid - MSL), which is then stored in a container for up to 12 hours. The steam that is heated by the MSL solution in the steam generator drives a turbine that powers the generator.

Structure

The tower construction consists of a lower reinforced concrete section with a height of 483.9 ft and a 134.5-foot-high steel construction of the solar receiver. The design of the steel structure of the receiver was created in the RFEM program by the Czech company ALLCONS Industry s.r.o., a customer of Dlubal Software.

Since the solar power plant complex is located in an earthquake-prone area high above sea level, where severe weather conditions prevail, it was very challenging to design the steel structure. In addition, all calculations had to be performed according to Chinese standards. When designing the steel structure of the receiver, variable temperature conditions at the receiver had to be taken into account, because the solar panels' surfaces are exposed to heat flux in sunlight that is 1,000 times higher than the normal solar flux. To ensure smooth expansion between the steel and concrete sections of the structure, a special multi-level anchoring system has been developed to allow movement of the structure in the radial direction.

With regard to the height and cylindrical shape of the tower, it was necessary also to take the wind load into account, which may result in transverse vibration due to wind turbulence. Calculations on the effects of wind and seismicity were performed on a complete tower model in RFEM, which is why close cooperation was necessary with the Chinese team that designed the lower concrete section of the tower. Thanks to good mutual cooperation, it was possible to reach agreement in the results of both teams with a maximum deviation of 1%. 

Project Location


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  • Updated 21 June 2021

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