A Thesis Submitted to Chongqing University in Partial Fulfillment of the Requirement for the Degree of Master of Engineering
By Chen Liqin
Supervised by Prof. Zhang Qin Major: Municipal Engineering
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重庆大学硕士学位论文
英文摘要
the vacuum pipe system step by step, the sewage transmission distance up to about as far as 3000m. Then, the article studies the calculation of selection for vacuum pump, vacuum tank, sewage pumps and other equipment in pump station. Rotary vane vacuum pump with energy-efficient, the characteristics of extreme high vacuum, and circulating water temperature is too high will not result in cavity and reduce efficiency, so recommended. Finally, according to computational theory of vacuum drainage system which is related above, the article examples design and calculation of the vacuum drainage system for one conference center Keywords: Vacuum drainage system, Economic Analysis, Composition requirements, Applications,
真空排水在排水系统中 的设计理论研究
重庆大学硕士学位论文
学生姓名：陈丽琴 指导教师：张 勤 专 教授
业：市政工程
学科门类：工 学
重庆大学城市建设与环境工程学院
二 O 一一年四月
Study on Design Theory of Vacuum Drainage in the Drainage System
System design parameters
III
重庆大学硕士学位论文目录目 Nhomakorabea录
中文摘要 .......................................................................................................................................... I 英文摘要 .........................................................................................................................................II 1 绪 论 ......................................................................................................................................... 1
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重庆大学硕士学位论文
英文摘要
ABSTRACT
Vacuum drainage system is a new kind drainage system. Compared to conventional gravity drainage system, it has advantage of environmental protection, water conservation, etc. It frees from the limitations of gravity drainage system for slope and made pipeline more flexibly during the pipeline construction. Vacuum drainage system has been widely used in some Western developed countries, but can’t be replicated in the country due to economic, technical and other reasons. The vacuum drainage system is the use of air pressure difference to transport sewage. Firstly, the composition of the requirements of the system studied, for example, the location of pump station, request of pumps, vacuum tanks and sewage pumps, and the like in pump station, laying methods tube network, vacuum well and their accessories collection requirements to be met. Vacuum drainage system as a new kind drainage system, compared with the traditional gravity drainage method has many advantages, has wide range of applications. This paper also studied the main drainage systems of vacuum applications. The economic benefit of the vacuum drainage system is a prerequisite for application of the system. The article uses cost-benefit analysis to analyze one vacuum community ecological sanitation project in a city in northern China, and compares vacuum drainage system and on the same scale with the traditional gravity drainage system. The economic net present value of the vacuum drainage system more than conventional gravity drainage system, when the social discount rate is 8%, Therefore, from an economic point of analysis, the vacuum drainage system in our country is feasible. Design calculation of pipe network of a vacuum drainage system is a key part. The article in-depth study flow, pressure loss, gas-liquid ratio, flow rate and maximum transmission pipeline from the sewage pipe network, such as design parameters. For general residential area can be designed calculation method of sewage discharge, but for sanitary ware used for the high frequency in public places, it is better to calculate flow using the frequency of sanitary ware. The losses of vacuum drainage system include enhance static pressure loss and friction loss. Gas liquid ratio of vacuum drainage system is estimated by occupant density along the length of the main pipe. Calculated by the Bernoulli equation the maximum flow of sewage should be 4.5 ~ 5.5m / s, the average flow rate of water 1.3 ~ 2.4m / s. Used promoted step by step in
College of Urban Construction and Environmental Engineering of Chongqing University , Chongqing, China. April, 2011
重庆大学硕士学位论文
中文摘要
摘
要
真空排水系统是新型的排水系统，和传统重力排水系统相比，具有环保、节 水等优点，摆脱了重力排水系统管道需设坡度的局限性，使管道施工过程中管道 铺设更加灵活，在西方一些发达国家已经有了广泛运用，在国内由于经济、技术 等原因还不能得到推广。 由于真空排水系统是利用气压差来输送污水的，本文首先对系统的组成要求 进行了描述与研究，例如真空泵站的选址，真空泵站内真空泵、真空罐及排污泵 等设备的要求；真空管网的敷设方式；真空收集井及其附件需满足的要求等。真 空排水系统作为一种新型的排水系统，与传统重力排水方式相比有众多优点，应 用领域广泛，本文也研究了真空排水系统的主要应用领域。真空排水系统的经济 效益是该系统被推广应用的前提条件，文章针对中国北方某城市真空生态卫生小 区项目，运用成本效益分析法进行分析，对真空排水系统与同等规模的传统重力 排水系统进行经济性比较。当社会折现率取 8%时，真空生态排水系统的经济净现 值远大于传统重力排水系统。因此，从经济角度分析看，真空生态排水系统在我 国具有可行性。 真空排水系统管网的设计计算是真空排水系统设计的关键部分，本文对流 量、压力损失、气液比、管道污水流速及最大输送距离等管网设计参数进行了深 入研究。对于小区可采用一般居民区污水设计量计算方法计算排水量，而对于卫 生器具使用频率高的公共场所宜采用卫生器具使用频率计算流量；真空排水系统 的压力损失包括静提升损失和摩擦损失；真空排水系统的气液比是由沿主管长度 的人员密度估算而得；通过伯努利方程计算得污水的最大流速应在 4.5~5.5m/s，污 水平均流速为 1.3~2.4m/s；在采用逐级提升的真空管道系统中，污水的最远输送距 离可达约 3000m。本文还对真空泵站内真空泵、真空罐、排污泵等设备的计算选 型进行了研究。 最后，本文根据上述真空排水系统设计计算理论，对某会议中心真空排水系 统设计计算进行举例。 关键词：真空排水系统，组成要求，应用领域，经济性分析， 系统设计参数