| With China’s reform and opening up, the rural-urban integration, accelerating industrialization, rapidincrease of population, the increasing water pollution incident, the people are increasingly concerned aboutthe problem of drinking water and water conflicts gradually. Therefore, the construction of long-distancewater diversion project is particularly necessary, and it can solve this problem. With the construction oflong-distance water transfer projects gradually increased, water pipes burst pipes were frequent. And it canlose a lot of time and money. Scholars and engineers should pay attention to the issues of water hammerprotection, thus, water hammer protection issues are more worthy of attention and study.This article briefly describes the gas-liquid two-phase flow pattern in the pipe, the flow into eachother in six states between poor exhaust major hazards, focuses on the establishment and application ofgas-liquid two-phase flow model and dammed streams. And also describes the transient flow pressurepipes (water hammer) calculation method of analysis, feature line differential equations and finitedifference equations simplify. This paper describes the boundary conditions of the water hammerprotection, water pipes and water hammer pressure characteristic analysis classification analysis andtechnical analysis of the water pipeline protection. Water hammer protection boundary conditions,including the method of the first end of the pool, the upstream boundary condition for the centrifugal pumpand the exhaust pressure relief device functioning of the settlement, including the slow closing check valve,gas injection exhaust valve, pressure regulator tower, overpressure relief valve protection, pipeline end ofthe tank.In this paper, taking the two different long-distance water supply project for example, major researchstudy of its different effects on the state of the gas hydraulic transition process.Through a long-distance water supply project in Shaanxi Province-G segment pumping stations andwater supply projects in an industrial park in Shaanxi Province-A section of the pumping station projectlong-distance water pipelines pressure hydraulic transient analysis, including hydraulic transient state of itsgas project overview analysis, calculation of technical information, the calculation of hydraulic transitionprocess gas in different states, etc., to analyze them, summarize, summarize, proposed protective measures,the final analysis of the results of the entire project. After analysis proved gas pipeline water hammerprotection has a major role. And concluded that the pressure of water hammer protection is focused on theprevention of multiple Cavities Collapsing water hammer. In two projects, namely the application pump outlet slow closing check valve installed, ordinary float exhaust valve, installed at the specified Stakecomposite buffer tank vent valve and install two-way surge tank, a combination of these protectivemeasures form of water hammer protection, derived from the best protective measures. Therefore, thecombination of a variety of measures in the form of water hammer protection can play a very good effect,namely: slow closing check valve installed in the pump exit, drawn by installing fixed speed bufferComputing exhaust valve, two-way surge tank tower the best location.Through a comparative analysis of various practical engineering protection programs, using a varietyof protective measures combining ideas, computer simulations and water hammer water hammerprotection optimization and calculation proposed pumping accidents optimal protection against waterhammer protection measures. The purpose is to reduce water hammer cavities collapsing hazards andensure the normal operation of a similar diversion project, and this method has the reference value andprovides reference for similar projects in the water hammer protection. |
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