大尺度污泥堆肥发酵槽吹吸式排风系统研究

发布时间：2018-03-10 05:02

本文选题：发酵槽　切入点：吹吸式通风　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：城镇生活污水的急剧增加,导致污水处理产生的污泥也越来越多,而污泥堆肥处理技术因符合我国国情备受关注,但因其臭气捕集效率较低,成为这项技术难以普及的关键。本课题以郑州市某污泥处理厂为背景,研究其污泥堆肥发酵车间内臭气捕集的问题。目前常用于发酵车间的排风系统形式有上部吸气罩排风、诱导通风以及全面排风,还未有实际工程在单个发酵槽上应用吹吸式通风系统。而吹吸式通风系统常用于工业槽,但像发酵槽这类超大尺度阵发性污染源的槽子,有关设计计算方法还有待研究,这也是本课题研究的问题所在。首先,通过介绍吹吸式通风的流场理论,分析和对比现有吹吸式通风系统理论计算方法,总结出每种方法适用范围以及特点。其次,以本课题工程背景为算例,用现有吹吸式通风系统理论计算方法进行计算,将计算出的各个参数值建立不同的工况。最后,用CFD数值模拟技术建立发酵槽的几何模型,在单个发酵槽上建立吹吸式通风系统,对每种方法计算出的不同工况进行模拟分析。本课题主要研究的结论如下:1、针对现有几种有关吹吸式通风设计计算方法,将其计算结果对应的不同工况进行模拟,分析其主要污染气体的浓度分布云图和速度分布云图,找出可以应用在这种大尺度污泥发酵槽上的吹吸式通风计算方法,其中新流量比法较适合本工程应用;2、对新流量比法计算结果的工况进行优化设计,改变吹吸式通风系统的影响因素,建立不同的工况,对比不同工况捕集臭气的模拟结果得出最佳参数值:最佳吹风口下沿距槽面距离为0.5m、最佳吸风口下沿距槽面距离为0.3m、最佳出流角度α为20°、最小新流量比为0.4。3、在这类超大尺度的发酵槽上建立双侧吹吸式通风系统,对比单侧吹吸式通风系统最佳工况的臭气捕集效率,得出双侧系统不如单侧系统效率高。
[Abstract]:Urban sewage has increased dramatically, resulting in sewage sludge is also increasing, while the sludge composting was in line with China's national conditions of concern, but because of the odor trapping efficiency is low, become the key of this technology is difficult to spread. Subject to the Zhengzhou city sewage treatment plant sludge as the background, the research sludge compost fermentation workshop odor trapping problem. Commonly used in fermentation workshop exhaust system forms the upper suction hood ventilation, ventilation and induced complete exhaust, there is no practical application in a single fermentation tank push-pull ventilation system. The push-pull ventilation system commonly used in industrial trough, but like the fermentation tank this kind of ultra large scale Paroxysmal Pollution Source trough, the design calculation method remains to be studied, which is also the subject of research. Firstly, through the introduction of push-pull ventilation flow theory, analysis and comparison The existing push-pull ventilation system theory calculation method, summed up the scope of each method and characteristics. Secondly, with the project background as an example, calculated by the existing push-pull ventilation system theory calculation method, the parameters will be calculated to establish different conditions. Finally, simulation geometric model of fermentation tank technology the CFD is used, establishment of push-pull ventilation system in a fermentation tank, simulation analysis is carried out on different working conditions of each method are calculated. The main research topics are as follows: 1, in view of several calculating methods for push-pull ventilation design, the calculation results corresponding to different conditions were simulated, analyzed the main air pollution concentration distribution and velocity distribution, find out the calculation method of push-pull ventilation can be used in the large scale sludge fermentation groove, the new flow ratio method is more suitable for The application of this project; 2, optimize the design of the new method than the calculation results of traffic conditions, changing the influence factors of push-pull ventilation system, the establishment of different working conditions, comparing the simulation results under different conditions to capture odor optimum parameters: the best blowing port along the groove surface distance is 0.5m, the optimal suction outlet the distance from the groove surface is 0.3m, the best flow angle is 20 degrees, the new flow ratio is 0.4.3, the establishment of bilateral push-pull ventilation system in the fermentation tank, this kind of ultra large scale, compared to unilateral optimal conditions for blowing odor suction ventilation system the trapping efficiency, the system is better than unilateral bilateral high efficiency of the system.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;TU834

【参考文献】