Study On Optimum Design Of Long-Distance Pipeline For Urban Heating

In recent years,the scale of China's infrastructure construction has been gradually expanded under the promotion of economic development and the total investment in the project has continued to rise.Therefore,the optimization and design of heating pipelines have gradually become the focus of discussion and research in the industry.Optimizing the design of long-distance heat supply pipeline and heating pipe network not only can save the project investment,but also has great significance in reducing the energy consumption of heating and improving the economic efficiency of enterprises.At the same time,optimization of heating pipelines is also a basic prerequisite for ensuring the stability of heating and the safety of operation.Because the optimal design of heating pipe plays a key role in the field of heating,many domestic and foreign experts have carried out comprehensive and in-depth analysis and research and formulated various strategies for improvement and improvement.However,such strategies In practical application has encountered a lot of resistance.The article focuses on how to optimize long-distance heating pipelines for research.At the same time,combined with the actual project on heating pipe network long-distance pipeline technical programs to conduct research and analysis.After reading a lot of literatures,based on the scheme of long distance pipeline to optimize heat as the research object,combined with the Shijiazhuang thermoelectric heat transmission pipeline project director of an example,the use of technical means to develop a variety of different,the long pipeline heating scheme,specific programs such as under:Scheme one: 2 DN1400 pipeline,a pressure pump installed in the return line,1 pressure heat exchanging stations;Scheme two: 2 DN1400 pipeline,a heat storage tank,a pressure pump installed in the return line,1 pressure heat exchanging stations;Scheme three: 2DN1400 pipeline,two thermal storage tank,two booster pump station installed in the return line,no pressure heat exchanging stations;Scheme four: 2 DN1200 pipeline,two thermal storage tank,pressure pump station two symmetrically arranged,a pressure heat exchanging stations;Scheme five: 2 DN1400 pipeline,a heat storage tank,pressure pump station two symmetrically arranged,a pressure heat exchanging stations;Scheme six: 1 DN1600 pipeline,a heat storage tank,pressure pump station two symmetrically arranged,a pressure heat exchanging stations.According to practical experience,6 kinds of long distance pipeline project,from hydraulic analysis,technical analysis and other angles of the pros and cons of each,and the heat storage tank,pumping station and pressure heat exchanging stations were evaluated.At the same time.The maximum output power plant based on 2800 MW,the scheme 4 and 5were assessed also,analyzing the investment and operation cost.At the same time in the evaluation of these 6 programs,2.1 GW and 2.8 GW respectively in two different power plants lose heat,however,agreed with toze consultation in operation and maintenance costs(OPEX)The calculation and storage tank(TES)output calculation is only for the 2.8 GW.In these 6 schemes,the final evaluation that only two(scheme 4 and 5)in a feasible scheme.Theremaining 4,3 of them for security reasons is not feasible,because the 1 heat transport ability while the foot is not feasible.Finally according to the investment cost,operation cost,purchase and sale of heat price,scheme 5 is the most should be studied in the next step of the program.It is necessary to point out that the two scheme cost difference is the output of2.8GW thermal power plant based on the situation,such as The output is 2.1GW,4 because of smaller pump consumption has become the research should be the next step of the plan.The final financial analysis also shows that the design of the scheme 4 and 5 can be optimized,the financial internal rate of return reached 10.07% and 12.74%,so the economic benefits of the 2clock scheme significantly,also has an important reference for other city heating pipeline optimization design and research.