恒壓供水在長距離輸水工程中應用與研究
[Abstract]:The main task of the water supply project in the future science and technology city is to transform the present situation of the water source well in the Marchikou water source area, build a new water pipeline along Baige Road and Shunsha Road to build a new water transfer and storage plant on the north side of the future science and technology city, and adopt a reasonable water resources allocation scheme. So as to provide a reliable water source guarantee for the future science and technology city. The future water supply project of science and technology city is to ensure the safety of water supply and support the development of science and technology city in the future. Fifteen water source wells are selected as groundwater sources, and the maximum water supply scale and water plant storage capacity are 40,000 square per day. Each water source well is connected to the new pipeline through the present D line, the C line water main pipe is connected to the new pipeline, the total length of the newly built water pipeline is 28.08km, in which DN900 nodular cast iron pipe is 3.95km, DN800 nodular cast iron pipe is 24.13km, from west to east, From high to low laying to the future science and technology city water plant front pool, for the water plant to provide a stable water source. The water plant is arranged in the northwest corner of the future science and technology city, and eight water supply pumps are set up in the plant, and the pressure measuring points are set up at the outlet of the water plant. According to the outlet pressure signal of the pumping station, the water supply mode of frequency conversion and constant pressure is adopted to provide domestic water to the users in the science and technology city. Based on the design example of water supply project in science and technology city in the future, this paper makes a systematic study on the influence of constant pressure water supply mode on the whole water supply system, and analyzes the influence of each parameter in the water supply system on the system. The combined control of pump, frequency conversion and current regulating valve in similar projects is studied. The speed regulation performance curve of the pump is drawn up, and the speed regulation ratio is obtained by fitting the parallel curve of each pump, and the model of the whole water transmission system is established, and the excessive process of the water transmission system is calculated and analyzed. The influence of power frequency and frequency conversion on the system is compared under the condition of low flow rate. The principle and analysis process of closed pipeline fluid mathematical model in water transmission system are briefly described. Through theoretical analysis and numerical calculation, this paper puts forward the analysis results of the transition process of water supply project in science and technology city in the future, which provides scientific basis and technical support for the design and operation management of long distance water transmission project. The main conclusions are as follows: (1) for the condition that the water source is higher than the water plant, the drain phenomenon of the pipeline will occur in the condition of low flow rate, and the flow regulating valve should be set at the end of the pipeline to avoid the occurrence of the deflow phenomenon, and at the same time, according to different working conditions, Draw up the characteristic curve of the regulating valve. (2) for the condition that multiple water source wells supply water to the pipeline at the same time, the deep well pump of the water source well should be equipped with frequency converter. The influence of constant pressure water supply on the whole water transmission pipeline is reduced by speed regulation operation. (3) for the condition that multiple water source wells supply water to the pipeline at the same time, the starting and stopping of the pump should be carried out one by one in the process of starting and stopping the pump. There should be a corresponding interval. (4) the commissioning and operation scheme of the water transmission system and the water plant is put forward.
【學位授予單位】:清華大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU991
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