Nuclear Power Plant Structural Steel Fabrication Process Boiler Frameworks

Thermal Power Plant Nuclear Generation Plant Structural Steel Fabrication Boiler Frameworks

As one of most pioneering light& heavy steel framing fabricators in China, we have engaged in quite a lot of power plant light&heavy steelworks fabrication.  Except the China domestic project fabrication, we are also quite capable to do structural steel fabrication based on America US standard, Europe standard, UK Britain and Australia standard and so on. 

Following is the power plant steel structure member introduction: 

Steel structure Member has the advantages of high strength, light weight and convenient production and installation, and has become the main structural form of the main powerhouse of large thermal power plants.  Compared with the beam-column rigid frame support structure system, the hinged support frame structure system has the advantages of simple manufacture, convenient and fast installation, material saving and obvious economic benefits. The main workshop of a traditional thermal power plant generally includes a steam engine room, a deaerator room and a coal bunker room. Whether the main building of the hinged bracing frame system consisting of only the steam turbine room and the deaerator room can meet the seismic design requirements needs to be verified by seismic analysis. The dynamic response of the main powerhouse of the steel structure of the hinged bracing frame system under the action of earthquake is analyzed to provide a reference for the application of this kind of engineering. This paper takes the Laos Hongsha 3×600MW coal-fired power station project as the engineering background.

The steel structure main powerhouse of the thermal power plant is composed of two parts: the steam engine room and the deaerator room, and adopts a hinged support frame system. According to the structural layout of the main building, the finite element software Midas/Gen is used to establish a three-dimensional spatial model for modal analysis, the arrangement of supports is adjusted according to the results of the modal analysis, and the modal decomposition response spectrum method is used to carry out the structural seismic design; The time-history analysis of the main powerhouse is carried out in the first stage, and the dynamic response of the main powerhouse under the action of earthquake is studied. The elastic stage is divided into one-way and two-way seismic wave input conditions; Bottom shear results for comparison.

The research results show that when two main supports are arranged on each longitudinal axis of the main powerhouse, the periods of the longitudinal and transverse main vibration modes are not much different, and the longitudinal and transverse dynamic characteristics are similar, which is beneficial to improve the torsional effect of the structure; the elastic time history results are consistent with The difference between the results of the response spectrum method meets the requirements of the specification; for the elastic time history analysis of irregular structures such as the main powerhouse of a thermal power plant, the influence of bidirectional seismic wave input should be considered, and the torsional effect of the higher part of the deaeration room is obvious; under rare earthquakes , the maximum displacement angle of the main powerhouse is 1/59, which meets the requirements of 1/50 of the seismic code, but the margin is small; the seismic response at the bottom of the split floor, the change of column section and the part above the deaeration room is relatively large, and it becomes weak Links should be paid attention to when designing such structures.

Specification: