山西省临猗县防氟供水工程系统运行分析研究
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摘要
供水工程是将电(热)能转化为水能进行农业灌溉,乡镇供水、渍涝排水及跨流域调水等一系列综合性水利工程。随着科学技术进步和国民经济的发展以及现代化农业对排灌、节水要求的日益提高,供水工程发挥着越来越大的作用。供水工程在发挥其效益的同时,一方面其每年的耗电量巨大,我国供水工程耗电量约占全国总用电量的20%-25%,而我国的泵站运行效率一般为30%左右,比工业发达国家低10%-30%;另一方面,供水工程中水锤事故的发生,给人民的生活和生产带来巨大的损失。因此,对泵系统进行稳态运行分析研究,同时进行必要的系统安全(水锤)计算,实现供水工程安全、高效运行,对解决水资源紧张问题和节约能源都有十分重要的意义。本论文将对山西省临猗县防氟供水工程系统运行中的稳态运行状况、供水系统水锤的防护优化等方面进行分析研究,以期对该系统的稳定、安全和合理运行及自动化控制系统的实现提供技术支持。
本论文在建立系统稳态运行分析的数学模型的基础上,进行了系统的运行分析;基于水力过渡过程计算的特征线法建立了不同水锤防护措施下的水锤计算模型,并选取了合理的数值计算方法,开发了计算机分析系统,主要内容如下:
(1)以山西省临猗县防氟供水工程为例进行系统的稳态运行研究,在建立数学模型的基础上,采用计算机模拟对系统稳态运行状况分析,分析不同水位变化的各种情况(最高水位、最低水位、设计水位),不同机组组合工况下系统的稳态运行特性,为供水系统安全高效运行和自动化系统的实现提供技术依据。
(2)以山西省临猗县防氟供水工程为例进行停泵水锤的分析和计算,采用特征线法结合水泵并联运行和各种阀门对应的边界条件方程,建立了对应的水力计算模型,对水锤消除器、液控蝶阀,多功能阀等水锤防护措施进行了数值模拟和分析比较,提出该系统安全运行条件下的最优防护方案。
(3)采用界面性强、面向对象的可视化编程软件Visual Basic 6.0作为开发语言,结合SQL Server 2000数据库,开发出界面友善、操作简单、功能齐全、性能可靠的泵站稳态运行模拟系统以及水力过渡过程数值模拟系统。
(4)最后对上述研究成果进行了分析总结,提出下一步有待研究的问题。
Water supply project is the integrated water project which can be used in agricultural irrigation, rural water supply, waterlogging drainage, inter-basin water transfer and so on by translating the electrical (heat)energy into hydropower.Along with scientific and technological progress and economic development, as well as the increasing requirements of modernization of agriculture to irrigation, drainage and water-saving, the water supply project are playing more and more major role. When it displays its benefit, on the one hand its every year's power consumption approximately occupies the 20%-25% of the Nation. China's pumping stations operating efficiency is generally about 30 percent, lower than the industrialized countries 10% -30%. the other hand, the water hammer accident Occurrences in the water supply project, brings the massive loss for people's life and the production. So, it has great significance the for the security efficient , operation and solving the problem of the shortage of water resources and conservation of energy to analysis the steady-state operation and Calculates the necessary security systems (water hammer) On the pump system. The paper will study the stable-state movement condition, the protection optimization of hammer of system and so on. With the view of providing the technical support for this system stable, safe and the reasonable movement and the automation control system in the Shanxi Province Linyi County against fluorine water supply project system.
The paper analyses the operation of the system on the basis of mathematical models for the operation of the system, Establishes the water hammer calculation model under the different measures of water hammer protection under the Method of characteristics of the Hydraulic calculation of the transition process, selected a reasonable numerical calculation method, and developed of a computer analysis system. The following is the main content:
(1) The steady-state operation system research under the anti-fluoride water supply project of Linyi County of Shanxi Province. on the basis of mathematical model, the analysis to the system steady-state operation using computer simulation, the analysis of different changes of the water level (the highest level, the lowest level, design level), single pump, as well as the systems steady-state operation Characteristics when various conditions are Paralleled. Provide the theoretical basis for the safety of highly efficient and reliable operation of pumps.
(2)The analysis and calculation about water hammer by pump stopped under the anti-fluoride water supply project of Linyi County of Shanxi Province. The corresponding hydraulic calculation models are established by the method of characteristics with the pumps operating in parallel and different types of valves' boundary conditions equation. Do the Numerical simulation, analysis and comparison to Water Hammer protective measures such as the Water Hammer Eliminator, Hydraulic Control Butterfly, and Multi-function valve. Then it proposes the optimal protection way under the condition of Safe Operation.
(3) Uses interface-related, and the object-oriented visual programming software, Visual Basic 6.0, as the development language, combines with SQL Server 2000 database, and develops a friendly interface, simple, functional and reliable performance pumping station simulation system on Steady-state, and the Numerical Simulation System about Hydraulic transition process.
(4) The results above were analyzed and summarized, and proposed new problems to the next step for further research.
本论文在建立系统稳态运行分析的数学模型的基础上,进行了系统的运行分析;基于水力过渡过程计算的特征线法建立了不同水锤防护措施下的水锤计算模型,并选取了合理的数值计算方法,开发了计算机分析系统,主要内容如下:
(1)以山西省临猗县防氟供水工程为例进行系统的稳态运行研究,在建立数学模型的基础上,采用计算机模拟对系统稳态运行状况分析,分析不同水位变化的各种情况(最高水位、最低水位、设计水位),不同机组组合工况下系统的稳态运行特性,为供水系统安全高效运行和自动化系统的实现提供技术依据。
(2)以山西省临猗县防氟供水工程为例进行停泵水锤的分析和计算,采用特征线法结合水泵并联运行和各种阀门对应的边界条件方程,建立了对应的水力计算模型,对水锤消除器、液控蝶阀,多功能阀等水锤防护措施进行了数值模拟和分析比较,提出该系统安全运行条件下的最优防护方案。
(3)采用界面性强、面向对象的可视化编程软件Visual Basic 6.0作为开发语言,结合SQL Server 2000数据库,开发出界面友善、操作简单、功能齐全、性能可靠的泵站稳态运行模拟系统以及水力过渡过程数值模拟系统。
(4)最后对上述研究成果进行了分析总结,提出下一步有待研究的问题。
Water supply project is the integrated water project which can be used in agricultural irrigation, rural water supply, waterlogging drainage, inter-basin water transfer and so on by translating the electrical (heat)energy into hydropower.Along with scientific and technological progress and economic development, as well as the increasing requirements of modernization of agriculture to irrigation, drainage and water-saving, the water supply project are playing more and more major role. When it displays its benefit, on the one hand its every year's power consumption approximately occupies the 20%-25% of the Nation. China's pumping stations operating efficiency is generally about 30 percent, lower than the industrialized countries 10% -30%. the other hand, the water hammer accident Occurrences in the water supply project, brings the massive loss for people's life and the production. So, it has great significance the for the security efficient , operation and solving the problem of the shortage of water resources and conservation of energy to analysis the steady-state operation and Calculates the necessary security systems (water hammer) On the pump system. The paper will study the stable-state movement condition, the protection optimization of hammer of system and so on. With the view of providing the technical support for this system stable, safe and the reasonable movement and the automation control system in the Shanxi Province Linyi County against fluorine water supply project system.
The paper analyses the operation of the system on the basis of mathematical models for the operation of the system, Establishes the water hammer calculation model under the different measures of water hammer protection under the Method of characteristics of the Hydraulic calculation of the transition process, selected a reasonable numerical calculation method, and developed of a computer analysis system. The following is the main content:
(1) The steady-state operation system research under the anti-fluoride water supply project of Linyi County of Shanxi Province. on the basis of mathematical model, the analysis to the system steady-state operation using computer simulation, the analysis of different changes of the water level (the highest level, the lowest level, design level), single pump, as well as the systems steady-state operation Characteristics when various conditions are Paralleled. Provide the theoretical basis for the safety of highly efficient and reliable operation of pumps.
(2)The analysis and calculation about water hammer by pump stopped under the anti-fluoride water supply project of Linyi County of Shanxi Province. The corresponding hydraulic calculation models are established by the method of characteristics with the pumps operating in parallel and different types of valves' boundary conditions equation. Do the Numerical simulation, analysis and comparison to Water Hammer protective measures such as the Water Hammer Eliminator, Hydraulic Control Butterfly, and Multi-function valve. Then it proposes the optimal protection way under the condition of Safe Operation.
(3) Uses interface-related, and the object-oriented visual programming software, Visual Basic 6.0, as the development language, combines with SQL Server 2000 database, and develops a friendly interface, simple, functional and reliable performance pumping station simulation system on Steady-state, and the Numerical Simulation System about Hydraulic transition process.
(4) The results above were analyzed and summarized, and proposed new problems to the next step for further research.
引文
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