复合齿形微气泡发生装置的设计与实验研究

发布时间：2018-01-12 02:19

本文关键词：复合齿形微气泡发生装置的设计与实验研究　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着城镇人口增加,城市污水处理要求逐步提高,为符合国家排放标准,污水处理厂对污水进行曝气处理,提升水体含氧量,为生化分解提供有氧环境。微气泡发生装置是应用在污水处理过程中曝气环节的一种水力设备。相比于鼓风、表面、射流等现存曝气方式,微气泡曝气方式具有氧利用率高,能耗低,低污染等特点。由于现存微气泡理论和可借鉴的设计经验不足,螺旋式微气泡发生装置的研发一直停留在变工况不变设备结构的阶段。针对这一问题,本文提出一种不同螺纹复合齿形的新型微气泡发生装置。从理论研究和实验方面展开工作,具体内容如下：(1)研究微气泡发生装置的基本原理,分析影响装置性能的设计参数。基于现存理论指导相似设备设计,设计并搭建复合齿形微气泡发生装置实验平台。(2)通过Workbench进行几何建模,使用Fluent软件对微气泡发生装置全流域进行水力性能模拟和曝气性能分析。(3)通过复合齿形微气泡发生装置实验平台,分别对三角形、半圆形及组合齿形的微气泡发生装置在不同真空度下的曝气性能进行了研究。通过以上工作,得出关于复合齿形微气泡发生装置的相关结论如下：(1)提出的新型微气泡发生装置具有良好曝气能力,水力性能符合传统叶轮泵扬程曲线。经过实验验证,该设备能够作为微气泡发生装置应用于污水曝气工艺环节当中。(2)复合齿形能够整合各单一齿形泵送性能特点。相比于单一齿形微气泡发生装置,复合齿形灵活性高,拆装方便,能够根据不同工况及泵送要求更换转子和定子组合,达到一套装置多用的目的。(3)相比于单一齿形微气泡发生装置,同样的曝气要求下,复合齿形微气泡发生装置能够将曝气效率提高15%左右,减少了污水处理的整体耗能。复合齿形能够提高曝气设备气流的震荡性,对气液两相间氧传质具有提升作用。
[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.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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