干室潜水式鼓风曝气机的设计与试验

发布时间：2018-05-26 09:30

本文选题：鼓风曝气机 + 浮岛型浮筒　；参考：《扬州大学》2015年硕士论文

【摘要】：曝气机是曝气充氧技术的主角,其性能直接影响曝气效果和效率,被广泛应用于污水处理、景观水体水质改善工程和水产养殖等行业。传统的曝气设备可以分为鼓风曝气、机械曝气、射流曝气三类,其原理不同,优缺点各异,其中鼓风曝气增氧效果最好,但需要建设鼓风机房和曝气管网,投资大；机械曝气安装维护方便,但在水面曝气,增氧效果差,射流曝气在水下曝气,效率低,易堵塞。在分析现有产品优缺点的基础上,设计出了一种集水面和水下曝气优点的干室潜水式鼓风曝气机,并在现场进行了初步试验,取得了良好的效果。其主要结果如下：1、创新性的提出了干室潜水式鼓风曝气机的结构形式。新型曝气机由一体化浮岛型浮筒和固定在浮筒下部的曝气管路组成,风机安装在浮筒内,由U形连通管连接风机和曝气管路。装置既是干室的又是潜水的,浮筒内所有设备无需考虑水密封问题,管路系统中不设任何阀门,因此效率高,安装维护方便。2、设计了旋转和固定式两种微孔曝气方式。通过在曝气管上设计向上的微孔曝气头和侧向喷气孔,高压气体由U形连通管经密封旋转轴承进入曝气管后,大部分气体由微孔曝气头向上曝气,小部分由侧向喷气孔喷出,在反作用力推动下,曝气管绕浮筒做3600旋转,达到了旋转曝气的目的。同时设计了固定式的微孔曝气装置,计算了曝气管路阻力。3、制作了1台功率为1.5KW的干室潜水式鼓风曝气机,并在池塘进行了现场试验。结果表明,干室潜水式鼓风曝气机对不同水深的水体有强烈的搅拌混合作用,随着开机时间增加,不同水深溶解氧浓度将会趋于一致,其影响半径约为15m,开机90min后水深0.3m处溶解氧浓度增加13.35%,水深0.9m处溶解氧浓度增加34.39%,水深1.5m处溶解氧浓度增加80.21%。4、干室潜水式鼓风曝气机对其曝气管范围内的水质起到一定的改善作用。试验中连续开机12小时,水体中高锰酸钾指数最大去除率达到29.8%,氨氮最大去除率达到48.7%。而叶绿素的去除虽然也有效果,但是规律并不明显。5、干室潜水式鼓风曝气机运行稳定可靠。固定式微孔曝气装置除风机外没有运动部件,且通风散热良好,在试验水体运行6个月,其中通过连续运行72小时考验,性能稳定。
[Abstract]:Aerator is the protagonist of aeration and oxygenation technology, and its performance directly affects the aeration effect and efficiency. It is widely used in wastewater treatment, landscape water quality improvement engineering and aquaculture industry. The traditional aeration equipment can be divided into three types: blast aeration, mechanical aeration and jet aeration. Its principle is different, and its advantages and disadvantages are different. The installation and maintenance of mechanical aeration is convenient, but the effect of aeration on water surface is poor, the jet aeration is underwater aeration, the efficiency is low, and the aeration is easy to be blocked. Based on the analysis of the advantages and disadvantages of the existing products, a dry chamber diving blower aerator is designed, which combines the advantages of surface aeration and underwater aeration, and a preliminary test is carried out in the field, and good results are obtained. The main results are as follows: 1. The structure of dry-chamber diving blast aerator is innovatively proposed. The new aerator consists of an integrated floating island buoy and an aerated pipe fixed in the lower part of the buoy. The fan is installed in the buoy and connected by a U-shaped connected pipe to connect the fan and the aerated pipe. All the equipment in the buoy does not need to consider the problem of water seal, there is no valve in the pipeline system, so it has high efficiency, convenient installation and maintenance. Two kinds of micropore aeration modes, rotating and fixed, are designed. Through the design of an upward microporous aerator and a lateral jet hole on the aeration pipe, after the high pressure gas is entered into the aeration pipe by a U-shaped connected tube through a sealed rotating bearing, most of the gas is aerated upward by the microporous aeration head, and a small part is ejected from a lateral jet hole. Under the push of reaction, the aerator rotates around the buoy 3600, which achieves the purpose of rotating aeration. At the same time, a fixed microporous aeration device was designed, and the resistance of aeration pipe was calculated. A dry chamber submersible blower aerator with power of 1.5KW was made, and the field test was carried out in the pond. The results show that the dry chamber diving air aerator has a strong mixing effect on the water body with different water depth, and the dissolved oxygen concentration of different water depth will tend to be consistent with the increase of start-up time. The influence radius is about 15m.The dissolved oxygen concentration at 0.3m water depth, the dissolved oxygen concentration at 0.9m water depth and the dissolved oxygen concentration at 1.5m water depth are increased 13.35 and 34.39m respectively, and the water quality in the aerator is increased by dry-chamber snorkel aerator at 1.5m. To a certain degree of improvement. The maximum removal rate of potassium permanganate index and ammonia nitrogen were 29.8and 48.7 respectively. Although the removal of chlorophyll also has effect, the rule is not obvious. 5. The dry chamber diving air aerator runs stably and reliably. The fixed microporous aeration device has no moving parts except the fan and has good ventilation and heat dissipation. It runs in the experimental water for 6 months, and the performance is stable after 72 hours of continuous operation.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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