【摘要】：隨著回轉式空氣預熱器在現代火電機組的鍋爐中作為一種換熱設備得到廣泛的應用,對預熱器圍帶驅動和中心驅動兩種驅動方式優(yōu)劣的討論不斷增多。圍帶驅動的特點是,結構簡單,即使在潤滑條件較差的條件下也能運行,這使得圍帶驅動的使用壽命較長,但現場安裝需要花費較多的時間以組裝,焊接,調試圍帶,保證圍帶與減速機輸出軸上的齒輪嚙合;中心驅動裝置安裝簡單省事,但對潤滑要求較高,需要定期補充潤滑脂。本文以預熱器轉子結構為研究對象,根據中心驅動預熱器轉子的結構特點,對轉子結構在安裝和運行過程中的受力情況進行了受力分析,研究了轉子結構的應力分布特點。研究表明,凸耳座外端與徑向隔板根部交接處是轉子徑向隔板的最大受力點,也是扭剪斷裂敏感區(qū)。在此基礎上,以略陽電廠6#爐停機檢修的兩臺中心驅動的空氣預熱器服役實物為例進行驗證研究,檢查結果表明,在轉子徑向隔板根部出現多處裂紋。對發(fā)生斷裂的部位的采樣樣本進行斷口分析,金相顯微試驗和材料性能測試等分析工作。結果表明,徑向隔板根部發(fā)生斷裂是除此處承載應力最大以外,還受焊接質量、應力狀態(tài)、材料的冶金質量等多因素綜合影響的結果。經本文的力學分析和試驗研究研究結果表明,采用中心驅動預熱器轉子的隔板根部存在扭剪斷裂敏感區(qū),該結果為今后預熱器設計時對于傳動方式的選擇提供了重要的參考意見。
[Abstract]:With the wide application of rotary air preheater as a kind of heat exchanger in the boiler of modern thermal power unit, the advantages and disadvantages of the two driving modes of preheater enclosure drive and center drive are more and more discussed. The characteristic of the belt drive is that it has a simple structure and can run even under the condition of poor lubrication, which makes the service life of the belt drive longer, but the field installation takes a lot of time to assemble, weld and debug the belt. Ensure that the enclosure engages with the gear on the output shaft of the reducer; The installation of the central drive device is simple and labor-saving, but the lubrication requirements are high and the grease needs to be replenished on a regular basis. In this paper, taking the rotor structure of preheater as the research object, according to the structural characteristics of the central drive preheater rotor, the stress distribution characteristics of the rotor structure during installation and operation are analyzed, and the stress distribution characteristics of the rotor structure are studied. The results show that the junction between the outer end of the lug seat and the root of the radial partition is the maximum stress point of the rotor radial partition, and it is also the sensitive area of torsional shear fracture. On this basis, two central driven air preheaters, which are shut down and overhauled in Luoyang Power Plant, are taken as examples to verify the service of two central air preheaters. The inspection results show that there are many cracks at the root of the rotor radial partition. The fracture analysis, metallographic microscope test and material performance test were carried out. The results show that the fracture at the root of the radial partition is not only the maximum bearing stress, but also affected by many factors, such as welding quality, stress state, metallurgical quality of the material and so on. The results of mechanical analysis and experimental study in this paper show that there is a torsional shear fracture sensitive zone at the root of the baffle of the rotor driven by the central drive preheater. The results provide an important reference for the selection of transmission mode in the design of preheater in the future.
【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621

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本文編號：2495401