Vulnerability Evaluation And Heat Source Temperature Optimization Of Heating Pipe Network Based On Utility Network Model

The new and old heating districts in Yan’an city are taken as the research objects.Starting from the internal structures of heat exchange stations,heating pipelines,connection nodes and heat sources,the heating system in the new and old urban areas of Yan’an city is comprehensively evaluated and optimized from the perspective of engineering management through the spatial layout evaluation of heating facilities,the vulnerability analysis of heating network,the dynamic adjustment of heat source temperature,and the prediction and economic analysis of coal price.The main conclusions are as follow:(1)The recent coverage rate of heating pipe network in the old urban area reaches 78.70%,and will reach 82.96%in the long term.T’he recent coverage rate of heating pipes network in the new urban area reaches 80.57%,and will reach 85.11%in the long term,indicating that the pipe network construction in the new urban area is better than that in the old urban area,and has more development potential in the future.The density aggregation grade of heat exchange station in old city is concentrated in grade 1 to grade 3,and also in grade 5.The condensation degree of heating pipe network is 0.037,and the connectivity index is 0.139.The density aggregation grade of heat exchange station in new urban area is between grade 1 and grade 2,the condensation degree of heating pipe network is 0.028,and the connectivity index is 0.197.It shows that the aggregation of heat exchange stations in the old city is significantly higher than that in the new city,and the distribution is more intensive.(2)In this paper,the utility network analysis function is used to trace the source of the pipeline network model.The vulnerability of the heating pipeline network system is studied by simulating the accident situation of pipeline connection node damage and combining with the water division risk assessment method.It is found that the pipe diameter has a regular impact on the vulnerability of the heating pipeline network.At the same time,the node vulnerability of the new and old heating partitions is obtained,and the risk level of the heating pipe network in the old urban area is about 10 times that of the new urban area.According to the calculation results,relevant suggestions are put forward for the construction of the heating pipe network in the new and old urban areas.(3)In this paper,the average outdoor temperature of Yan’an from 2022 to 2030 is extracted by programming software,and the comprehensive heat index of the two heating zones from 2020 to 2030 is calculated by using the area heat index adjustment method.The average price of power coal in Yan’an from 2018 to 2022 is collected,and the function of coal price changing with time is approximately fitted.The annual coal consumption and the capital cost of purchasing coal under the planning period are calculated by using this function,so as to provide economic evaluation reference for heating enterprises in terms of capital investment.