The load and working conditions are combined with the working characteristics of the fuel tank, and the strength and rigidity of the fuel tank module are checked in three working conditions such as lifting, steady-state operation and transient operation. The lifting condition only considers the gravity of each component in the frame when lifting; the operating conditions only consider the normal full oil drop operation of each component; the transient operating conditions consider that each component is normally full of oil and the column is subjected to external load.
The weight of the components on the fuel tank is summarized in the fuel tank. The quality of the components is summarized. The main oil pump emergency oil pump top shaft oil pump total (kg) 1000500630 quantity 213 pipeline weight (kg) 345634 / fuel tank frame other parts quality summary. Fuel tank frame other parts quality summary (unit: kg) oil purification lubricant filter oil cooler exhaust fan total 182012404760380 frame column external load (unit: kN) in the gas turbine design process, due to the actual layout of the power plant, In addition to the load of the fuel tank module itself, the fuel tank frame is also subjected to a part of the additional load (the value is provided by the design institute). These loads are not long-term, but are accidental loads. The fuel tanks of the Million Grade Turbine are not subject to these external loads. The column is subjected to external loads and column numbers.
Here live load 5kN/m2. Dead loads include pipe loads and cable reel loads. Vertical loads include live loads, dead loads, and deposition loads, but exist at different live and deposition loads. Here, take the largest external load, that is, live load plus dead load for calculation. The horizontal load is 100% dead load, 50% live load and 0% deposition load.
Improved analysis of the original design beam defects The non-standard steel used in the original design uses a welded structure. One of its greatest features is the large welding stress and deformation. Local heating is used during the welding process, which inevitably produces welding stress and deformation. Welding stress and deformation may cause process defects such as hot cracks, cold cracks, brittle fractures, etc., and under certain conditions will affect the bearing capacity of the structure, such as strength, stiffness or compression stability; in addition, it will affect the processing of structural parts. Precision and dimensional stability.
These problems do not exist with standard parts and can be purchased directly for subsequent production, and the procurement, processing and inspection processes are simplified. In the design of the beam, in order to make full use of the material, the material should be placed far away from the central axis within a certain height limit. The analysis uses analytical methods, loads, conditions and results to optimize the design analysis method, load, and working conditions are the same as the original design.
Conclusion Through the above analysis, it can be seen that it is feasible to replace the non-standard parts of the 37-cubic fuel tank module with standard parts, which not only greatly saves the procurement cost, but also saves the processing and inspection work. This analysis is also applicable to the design and improvement of other components of the turbine.
With the continuous development of the electric power industry, in order to meet the requirements of energy saving and emission reduction, SAIC 1000MW units and combined cycle units will be more and more, and 37 cubic fuel tank modules will also have a wide range of applications. With the optimized structure of the fuel tank module proposed in this paper, it will be more cost-effective in future design and production. Under the same length, the smaller the cross-sectional area of ​​the section steel, channel steel and angle steel, the more material is saved, and the larger the section moment, the more difficult it is to deform. Therefore, in the selection of these types of steel, designers should first consider the selection of standard parts, which is conducive to processing inspection and save labor costs; secondly, the specifications of small section and large moment should be selected as much as possible to meet the design requirements. In this case, material costs can be saved. This is of great significance in the process of localization of imported components.
Steel Structure,Structural Steel,I Beam Fabrication,Mild Steel Box Section
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