Optimization And Numerical Calculation On Rebuilding And Extending Of Water Supply Network

With economic development, urban scale's expansion, the increase in water consumption, water rate increasing in many urban, water supply systems have been unable to meet the needs of urban development, cities are facing water distribution network system expansion issues. Also different from the new building, in fact, expansion of the objective function optimization problem is also included old pipe sections, that is, there are certain sections of the old unreasonable to exist, which are often designed by the experience of the old pipe sections has significantly affected the the entire pipe network system operating costs, and network systems have many hazards, such as poor water supply reliability, pipeline leakage, burst pipes frequently, etc. Due to water supply network has large investment and high management costs, so reasonably carrying out the expansion of water distribution network can not only enrich and improve the content of network design, optimal scheduling of water supply system can provide reasonable and reliable basis of information, but also works to reduce investment and raise the reliability of water supply system has an important practical significance.In this article, the city water supply network to the extension of the new location of the laying of pipelines, by sufficient pipeline diameter it is difficult to determine the economic and other issues, the establishment of a water distribution network to optimize the design of practical extension of the theory and the objective function, using nonlinear mixed-discrete variables bound by the planning method (MDOD algorithm) to optimize the network extension of the numerical model, the model is decomposed into water flow to the expansion of the distribution optimization, optimization of the new Shikishima diameter, flow and pressure lift pump station to optimize the 3 sub-systems, and finally through the analysis of comparative come to both economy and at the same time meet the other design goals to optimize the utility program.This article changed the extension to the service pipe net to carry on the analysis to the water present situation investigation material, rubbed the anti-determination and the hydroisopiestic line plan method to the length of pipe has made the analysis, and to changed the tubing which the extension selected to carry on the optimal comparison, according to《Urban water supply Profession in 2010 Technology advancement And in 2020 Prospect Goal》the request, the privileged operation high quality tubing (nodular graphite cast iron pipe, the PE tube), have made the good progress in the actual project application. this article links to the project reality, after having established the Mianzhu earthquake, the urban service pipe net changes the extension optimization model, to change the extension water source flow distribution the model decomposition to optimize, the caliber to optimize 2 sub-systems, carries on the numerical calculus through the optimized algorithm, thus determined changes the extension length of pipe respectively the most superior caliber and various water sources most superior water allocation plan.After the last economic theory and technology, computer technology, water supply and drainage of the organic integration of knowledge, the use of HYSZ6.0-CAD 2005 maximum optimization program, and incidents of fire, when three workers were checking the status of the program, such as water pressure line changes in uniform, the new pipe sections deposited most of the velocity of flow in the economy. In meeting the water and water pressure under the premise of optimizing the program and converted the value of the original cost of the program in comparison to prove that the program is to optimize the economy and reasonable.