【摘要】：本論文以脫硫吸收塔矩形在升孔為研究對(duì)象,利用數(shù)值計(jì)算方法,借助ANSYS軟件系統(tǒng)研究了脫硫吸收塔的穩(wěn)定性,并對(duì)矩形開(kāi)孔的上下邊界和縱邊界進(jìn)行補(bǔ)強(qiáng)筋優(yōu)化補(bǔ)強(qiáng),得到了一系列優(yōu)化結(jié)果,為大型火電廠濕法脫硫系統(tǒng)吸收塔的結(jié)構(gòu)設(shè)計(jì)及補(bǔ)強(qiáng)優(yōu)化提供了一定的可參考理論依據(jù)。主要研究?jī)?nèi)容和結(jié)論如下：(1)通過(guò)特征值屈曲分析預(yù)測(cè)吸收塔屈曲載荷的上限值,了解其屈曲形狀,為后面的非線性屈曲分析做基礎(chǔ)。通過(guò)特征值屈曲分析了解到,由于矩形孔洞的存在,其臨界屈曲載荷值遠(yuǎn)遠(yuǎn)小于無(wú)開(kāi)孔塔體屈曲載荷下限值,矩形開(kāi)孔嚴(yán)重削弱了塔體的穩(wěn)定性。(2)對(duì)脫硫吸收塔進(jìn)行考慮幾何大變形的非線性屈曲分析,得到更接近于實(shí)際情況的結(jié)構(gòu)載荷位移響應(yīng)圖。通過(guò)對(duì)影響吸收塔穩(wěn)定性的各參數(shù)進(jìn)行單獨(dú)的屈曲分析和正交組合屈曲分析,得到了矩形開(kāi)孔寬度,開(kāi)孔高度,開(kāi)孔中心高度,徑厚比以及變徑角度對(duì)吸收塔穩(wěn)定性的影響,并對(duì)各因素影響因子進(jìn)行排序。徑厚比對(duì)結(jié)構(gòu)的屈曲載荷值影響最大,幾乎是隨著徑厚比增大而呈幾何級(jí)的遞減；其次是矩形開(kāi)孔寬度,屈曲載荷值隨著開(kāi)孔寬度減小而線性遞增；開(kāi)孔高度,開(kāi)孔中心高度以及變徑角對(duì)結(jié)構(gòu)屈曲載荷值影響不太大。(3)對(duì)矩形開(kāi)孔上下邊界和縱邊界進(jìn)行補(bǔ)強(qiáng)筋補(bǔ)強(qiáng),分析各種型號(hào)的補(bǔ)強(qiáng)筋以及補(bǔ)強(qiáng)位置對(duì)吸收塔穩(wěn)定性的影響。通過(guò)比較不同截面形狀的補(bǔ)強(qiáng)筋下屈曲載荷值大小,確定補(bǔ)強(qiáng)筋的截面形狀,然后再對(duì)該截面形狀的補(bǔ)強(qiáng)筋進(jìn)行型號(hào)參數(shù)優(yōu)化和補(bǔ)強(qiáng)位置優(yōu)化,得到一系列優(yōu)化的補(bǔ)強(qiáng)筋型號(hào)和補(bǔ)強(qiáng)位置。(4)在矩形開(kāi)孔周邊進(jìn)行補(bǔ)強(qiáng)筋補(bǔ)強(qiáng)的基礎(chǔ)上對(duì)開(kāi)孔邊界進(jìn)行完全加筋板補(bǔ)強(qiáng)。加筋板設(shè)置使孔邊界剛度得到進(jìn)一步的加強(qiáng),有效緩解了開(kāi)孔角點(diǎn)處的應(yīng)力集中,應(yīng)力分布和變形更加均勻,塔體的穩(wěn)定性得到進(jìn)一步提高。最后,根據(jù)本文的一些優(yōu)化結(jié)果,對(duì)浙能溫州電廠四期2×660MW機(jī)組濕法脫硫工程吸收塔進(jìn)行優(yōu)化建議,在保證安全的前提下,減少了塔體的結(jié)構(gòu)用鋼量。鑒于目前國(guó)內(nèi)沒(méi)有專門(mén)的脫硫塔設(shè)計(jì)規(guī)范,本文中的一些優(yōu)化結(jié)論對(duì)于脫硫塔的設(shè)計(jì)及優(yōu)化具有一定的指導(dǎo)意義。
[Abstract]:In this paper, the stability of desulphurization absorption tower is studied by using numerical calculation method and ANSYS software system, and the upper and lower boundary and longitudinal boundary of rectangular hole are optimized and strengthened. A series of optimization results are obtained, which provide a certain reference theoretical basis for the structure design and reinforcement optimization of the absorption tower of wet desulphurization system in large thermal power plants. The main research contents and conclusions are as follows: (1) the upper limit value of the buckling load of the absorption tower is predicted by eigenvalue buckling analysis, and its buckling shape is known, which is the basis for the later nonlinear buckling analysis. Through the eigenvalue buckling analysis, it is found that the critical buckling load is much lower than the lower limit of the buckling load of the tower without opening due to the existence of rectangular holes. The stability of the tower is seriously weakened by the rectangular hole. (2) the nonlinear buckling analysis of the desulphurization absorption tower considering the geometric deformation is carried out, and the structural load displacement response diagram which is closer to the actual situation is obtained. The effects of rectangular hole width, hole height, hole center height, diameter to thickness ratio and variable diameter angle on the stability of absorption tower are obtained by means of individual buckling analysis and orthogonal combined buckling analysis of each parameter affecting the stability of absorption tower. The influencing factors of each factor were sorted. The ratio of diameter to thickness has the greatest influence on the buckling load of the structure, almost decreasing with the increase of the ratio of diameter to thickness, followed by the width of rectangular hole, and the value of flexion load increases linearly with the decrease of opening width. The height of the hole, the height of the center of the hole and the angle of variable diameter have little effect on the buckling load of the structure. (3) the upper and lower boundary and longitudinal boundary of the rectangular hole are reinforced by reinforcement. The effects of various types of reinforcement and reinforcement position on the stability of absorption tower are analyzed. By comparing the flexion load under the reinforcement with different section shapes, the section shape of the reinforcement is determined, and then the model parameters and reinforcement position of the reinforcement are optimized. A series of optimized reinforcement types and reinforcement positions are obtained. (4) based on the reinforcement around the rectangular hole, the fully stiffened plate is strengthened. The stiffness of the hole boundary is further strengthened by the installation of the stiffened plate, which effectively relieves the stress concentration at the opening corner, the stress distribution and deformation are more uniform, and the stability of the tower is further improved. Finally, according to some optimization results of this paper, the absorption tower of wet desulphurization project of 2 脳 660MW unit in Phase IV of Zhejiang Wenzhou Power Plant is optimized, which reduces the amount of steel used in the structure of the tower under the premise of ensuring safety. In view of the fact that there is no special design code for desulphurization tower in China, some optimization conclusions in this paper have certain guiding significance for the design and optimization of desulphurization tower.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU347;X773

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