| Steel coal scuttle is a common structure in coal-fired power plants to conveying andstoring coal."Shorts-like” steel coal scuttle is a new type of giant steel coal scuttle appearingin coal enterprises in recent years. The coal scuttle not only has many advantages such as:large capacity of storage, covering an small area, high efficiency of loading and unloading ofmaterials, but also can be used with elevator and belt conveyor, with very high efficiency as amechanized coal scuttle. The problem structural designers urgently need to know is how tosimplify and analyze the new type of coal scuttle, and find out the interaction between thecoal and the structure.Based on the "shorts" type steel coal scuttle in one coal-fired power enterprise, the thesisestablished two finite element models: with interaction between steel coal scuttle and coal;without interaction between steel coal scuttle and coal. A compared analysis is made after thestatic calculation of these two models. The main work is as follows:1. Set scuttle’s elastic modulus respectively as0.1MPa,1MPa,10MPa, and poisson’sratio as0.30,0.35,0.40, making a comparative analysis with internal force of coal scuttle andthe result of deformation. The results show that when the elastic modulus of coal material wasset from0.1MPa to0.2MPa, poisson’s ratio was set from0.3to0.4, when the single modelof steel coal scuttle, steel coal scuttle and coal material work cooperatively, the model’s walland side beams has the very good consistency in the aspect of internal force and displacementdiagram, regardless of the interaction between coal scuttle and coal material duringcalculation. When the elastic modulus of coal material is greater than0.2MPa, and poisson’sratio is less than0.3, the calculation results differ greatly, the result of single model is greaterthan the co-work model, the coal scuttle interact with coal material tremendously, as a result,the use of single model is unfavorable.2. After the comparative analysis of joint stress among the vertical scuttle wall, inclinedcoal scuttle wall and the adjacent small funnel, the results showed that there is largedifference between the calculation results of two kinds of model. Regardless of the interactionof coal and coal scuttle, the maximum stress raiser in stress concentration of vertical coalscuttle wall and inclined coal scuttle wall are270MPa and230MPa respectively; the stressbetween coal material and coal scuttle are75MPa and95MPa. Concerning to the calculationof maximum stress, the single model is2.4times to2.6times greater than the co-work model(coal material-coal scuttle).3. Set an mutual axially loaded bar in stiffening rib of the inclined coal scuttle wall andvertical coal scuttle wall, and make a contrast with no mutual axially loaded bar in severalaspects: the deformation of coal scuttle wall, stress, and the internal force of stiffening rib. The result showed that the maximum stress of coal scuttle wall is reduced by67.8%, and themaximum of displacement reduced by71.2%. The maximum bending moment of stiffeningrib decreases from16kN m-37kN m to0.3kN m-7kN m. The deformation and stressof coal scuttle wall decrease significantly. The bending moment of stiffening rib tends togentle and reduce greatly. As a result, axially loaded bar plays an important role in the process,so during the design, it is very necessary to set certain number of level axially loaded bars.4. When the side beams of coal scuttle areⅠ18、Ⅰ40b、Ⅰ63b respectively, the top of thevertical displacement of coal scuttle wall and stress are compared, and it can be found that thedifference of corresponding number is small, beam and coal scuttle shows an obvious effectto work together. It shows that side beams co-work very well with coal scuttle. |
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