本文關鍵詞：復合齒形微氣泡發(fā)生裝置的設計與實驗研究　出處：《北京化工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 曝氣 微氣泡發(fā)生裝置 組合齒形 氣液兩相流 實驗研究

【摘要】：隨著城鎮(zhèn)人口增加,城市污水處理要求逐步提高,為符合國家排放標準,污水處理廠對污水進行曝氣處理,提升水體含氧量,為生化分解提供有氧環(huán)境。微氣泡發(fā)生裝置是應用在污水處理過程中曝氣環(huán)節(jié)的一種水力設備。相比于鼓風、表面、射流等現(xiàn)存曝氣方式,微氣泡曝氣方式具有氧利用率高,能耗低,低污染等特點。由于現(xiàn)存微氣泡理論和可借鑒的設計經(jīng)驗不足,螺旋式微氣泡發(fā)生裝置的研發(fā)一直停留在變工況不變設備結構的階段。針對這一問題,本文提出一種不同螺紋復合齒形的新型微氣泡發(fā)生裝置。從理論研究和實驗方面展開工作,具體內容如下：(1)研究微氣泡發(fā)生裝置的基本原理,分析影響裝置性能的設計參數(shù)。基于現(xiàn)存理論指導相似設備設計,設計并搭建復合齒形微氣泡發(fā)生裝置實驗平臺。(2)通過Workbench進行幾何建模,使用Fluent軟件對微氣泡發(fā)生裝置全流域進行水力性能模擬和曝氣性能分析。(3)通過復合齒形微氣泡發(fā)生裝置實驗平臺,分別對三角形、半圓形及組合齒形的微氣泡發(fā)生裝置在不同真空度下的曝氣性能進行了研究。通過以上工作,得出關于復合齒形微氣泡發(fā)生裝置的相關結論如下：(1)提出的新型微氣泡發(fā)生裝置具有良好曝氣能力,水力性能符合傳統(tǒng)葉輪泵揚程曲線。經(jīng)過實驗驗證,該設備能夠作為微氣泡發(fā)生裝置應用于污水曝氣工藝環(huán)節(jié)當中。(2)復合齒形能夠整合各單一齒形泵送性能特點。相比于單一齒形微氣泡發(fā)生裝置,復合齒形靈活性高,拆裝方便,能夠根據(jù)不同工況及泵送要求更換轉子和定子組合,達到一套裝置多用的目的。(3)相比于單一齒形微氣泡發(fā)生裝置,同樣的曝氣要求下,復合齒形微氣泡發(fā)生裝置能夠將曝氣效率提高15%左右,減少了污水處理的整體耗能。復合齒形能夠提高曝氣設備氣流的震蕩性,對氣液兩相間氧傳質具有提升作用。
[Abstract]:With the increase of urban population, the requirement of urban sewage treatment is gradually raised. In order to meet the national discharge standards, sewage treatment plant aeration treatment of sewage, enhance the water oxygen content. Microbubble generator is a kind of hydraulic equipment used in aeration process of sewage treatment. Compared with existing aeration methods such as blast, surface, jet and so on. Microbubble aeration mode has the characteristics of high oxygen utilization, low energy consumption, low pollution and so on. The research and development of spiral micro bubble generator has been staying at the stage of constant equipment structure under variable working conditions. In this paper, a new type of micro bubble generating device with different screw thread composite tooth profile is proposed. The basic principle of the micro bubble generator is studied from the aspects of theoretical research and experiment, as follows: (1) study the basic principle of the micro bubble generating device. The design parameters that affect the performance of the device are analyzed. The design of similar equipment is guided based on the existing theory. Design and build the experimental platform of composite toothed micro bubble generator. 2) geometric modeling is carried out by Workbench. Fluent software was used to simulate the hydraulic performance and aeration performance of the whole basin of the micro-bubble generator. The aeration performance of semicircular and combined tooth shaped micro bubble generator under different vacuum degree was studied. The conclusions of this paper are as follows: (1) the new micro bubble generator has good aeration capacity and its hydraulic performance accords with the traditional impeller pump lift curve. The equipment can be used as a micro-bubble generator in the process of wastewater aeration. The composite tooth profile can integrate the characteristics of the pump performance of each single tooth shape, compared with the single-tooth micro-bubble generating device. The combination of rotor and stator can be changed according to different working conditions and pump requirements, which can achieve the purpose of multi-use of a set of devices. It is compared with a single toothed micro-bubble generator. Under the same aeration requirement, the aeration efficiency can be increased by about 15%, and the overall energy consumption of wastewater treatment can be reduced. The composite tooth profile can improve the turbulence of aeration equipment. It can enhance the oxygen mass transfer between gas and liquid phase.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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本文編號：1412263