The Study On Thermal Regime Of The Central Heating System Setting Peak Adjusting Heat Source

It had put forward higher requirements for urban central heating system as the continuously progress of economy and continuously rising with people's living standards, and the urban central heating system also has become an important criterion for the level of urbanization of a city. The central heating system setting peak adjusting heat source has gradually become the main form of urban central heating system for its energy-saving, low-cost running, high economic efficiency and security, stable and reliable system operation.In this paper, it solve the hydraulic and heat balance calculation problems of multi-heat-producer networking based on network graph theory. First, establishing the basic correlation matrix and basic loop matrix using of the topology theory of space heating network, obtaining the pipeline flow access to MKP; Then, the pressure drop and temperature drop of pipeline can be obtained using the relationship between pipe flow and pressure drop as well as the relationship between pipe flow and temperature drop, and the pressure and temperature of node can be got too with the relationship between nodes and pipe. We should pay attention to the numbering skills and chain branching choice when do the work of establishing pipe network topology structure.We select a heating network with two heat sources and seven heat users in Beijing as the computational object. One of these two heat sources is the cell heat transfer station as the main heat source used in this area, and the other is district boiler used as the peaking boiler in this area. We carried out the calculation with three different conditions as followings: peak adjusting heat source failure, peak adjusting coefficient changed and peak adjusting heat source's location changed. We made an analyze and summarize for the calculation results, so as to arrive over operating characteristics of the multi-heat-producer networking.It can give the theoretical support on the debugging on running for the future operation of such systems.