大石涧提灌泵站水利机械与压力管道水锤计算研究

发布时间：2018-05-04 00:09

本文选题：提灌泵站 + 压力管道　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：河南省洛阳市洛宁县是省定优质烤烟生产基地,辖内的小界乡和东宋镇,是洛宁烟叶主产区。小界乡和东宋镇均属于渡洋河流域,但是这两个乡没有蓄水取水工程,农业水资源缺乏。为了提高烟叶及其他农业生产水平,在洛宁县洛河一条支流渡洋河上修建渡洋河大石涧水源工程,通过建设水库、泵站与输水管道、输水渠道,调节水资源时空分布,提高农业水资源开发利用效率。泵站建设中合理分析提灌工程的规模和设计运行方案,对降低工程造价、优化设计、工程安全运行具有非常重要的意义;而在供水管道系统中,由于管道中水流速度的突然变化而引起管内压力变化,压力迅速上升或者压力迅速下降会导致管路破坏和泵站系统中设备破坏,更严重的可导致泵站建筑物的崩塌,因此管路水锤计算与防护成为保障提水输水系统安全运行的重要依据。在此背景下,本文以渡洋河大石涧水源工程为例,进行了泵站水力机械及压力管道水锤计算研究,主要内容和结论如下:1.根据规范进行了大石涧提灌工程的供水规模、泵站设计流量、泵站供水方案以及泵站水力机械选型分析,确定了水源特征水位及高位水池的池底高程、水泵的扬程、水泵的型号及台数、水泵运行工况曲线以及水泵安装高程等重要设计参数,并对南北岸一级和二级泵站配套机电的功率进行了复核。2.基于水锤计算的相关分析方法、步骤以及各种水锤保护措施的边界条件,以大石涧提灌工程北岸二级泵站为例,建立了大石涧提灌工程中用旁通管作为防护措施的理论模型,利用水锤计算相关软件,针对不同特征工况进行了水锤计算分析。3.通过对大石涧提灌工程供水管道不设防护措施和设置防护措施的水力过渡过程的比较,提出针对输水压力管道水锤防护的两种方案:在管路上设置空气阀门,对管路进行补气,防止管道内压力降低;在泵站出口安装缓闭蝶阀,防止管道内压力升高。
[Abstract]:Luoning County, Luoyang City, Henan Province is a high quality flue-cured tobacco production base. Xiaojie Township and Dongsong Town both belong to the Duyang River basin, but these two townships have no water storage project and lack of agricultural water resources. In order to improve the level of tobacco leaf and other agricultural production, the water source project of Dashijian, a tributary of Luohe River, Luoning County, was built to regulate the spatial and temporal distribution of water resources through the construction of reservoirs, pumping stations and water pipelines, water conveyance channels, etc. We will improve the efficiency of agricultural water resources development and utilization. The reasonable analysis of the scale and design operation scheme of pumping station is of great significance to reduce the project cost, optimize the design and run safely in the water supply pipeline system. Because of the sudden change of the flow velocity in the pipeline, the pressure in the pipe will change rapidly, the pressure will rise rapidly or the pressure will drop rapidly, which will lead to the failure of the pipeline and the equipment in the pumping station system, and even more serious to the collapse of the building of the pump station. Therefore, the calculation and protection of pipeline water hammer becomes an important basis to ensure the safe operation of water conveyance system. Under this background, taking the water source project of Dashijian in Duyang River as an example, the hydraulic machinery and water hammer of pressure pipe in pumping station are calculated and studied in this paper. The main contents and conclusions are as follows: 1. According to the specification, the scale of water supply, the design flow rate of pump station, the water supply scheme of pump station and the type selection of hydraulic machinery of pump station are carried out. The characteristic water level of water source, the elevation of pool bottom of high water pool and the head of water pump are determined. Some important design parameters, such as the type and the number of pumps, the operating condition curve of the pump and the installation height of the pump, are discussed. The power of the primary and secondary pumping stations in the north and south coast is reviewed. Based on the relevant analysis methods, steps and boundary conditions of various water hammer protection measures, a theoretical model of using bypass pipes as protective measures in Dashijian uplift Irrigation Project is established with the example of the second stage pump station on the north bank of Dashijian uplift Irrigation Project. By using the software of water hammer calculation, the water hammer calculation and analysis for different characteristic working conditions are carried out. By comparing the hydraulic transition process of water supply pipeline without protective measures and setting protective measures in Dashijian uplift Irrigation Project, two schemes of water hammer protection for water conveyance pressure pipeline are put forward: setting air valve on pipeline to replenish air to pipe line. Prevent pipeline pressure from decreasing; install slow-closing butterfly valve at pump station outlet to prevent pressure rising.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S277.9

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