Research On The Regulation Of One-way Ring-shaped Heat-supply Network

Running regulation of heating system means that when the heating load of users change, we need to adjust water supply temperature and water flow of the heating system to satisfy the heat demand. In order to guarantee the heating quality and satisfy the heat demand, also to make the heat production and transmission more reasonable and economical, we need to regulate the heating system.This paper mainly research on the adjusting method of one-way ring-shaped heatsupply network. The research content mainly include: research on the connection type of one-way ring-shaped system, and the way to determine water temperature running into the heating point in main pipe, analysis the regulation way combination of single heating source system with mixing water connection or indirect connection pattern, and also analysis the regulation of double heating source system.Research on the thermal conditions of the system, to obtain the heat load distribution method of this type system, also aquire the method to determine temperature parameters of heat source and users. Based on the thermal conditions, calculate and determine the temperature of supply water from the cooling point in main pipe network to thermal station, and aquire the thermal characteristics of one-way ringshaped heat-supply network. Derive the running regulation law of one-way ring-shaped heat-supply network with single and double heating soure.In traditional double pipe heat supply system,as it’s a parallel relationship between each heat station,the temperature of supply and return water from the first side of different heat station are same. The difference from traditional double-pipe system on running regulation is that heat stations in different cooling points are in series. And along the direction of the water flow circulation, the water supply temperature from different cooling points gradually decrease, and the hydraulic conditions of different branch do not affect each other. When the heat load of a heat station changes, the supply and return water from the first side of the downstream heat stations will change. When the heating system is running, it needs to adjust the supply water flow from the first side to heat station(and also the water mixing ratio when it is mixing water mode) according to the supply and return water temperature and heat load of the second side system of heat station to ensure the heat demand of users.With regard to single heat source of unidirectional ring-shaped system,apply different adjusting methods to the main ring pipe line and branch pipe line and the second side pipe network of heat station, with different connections(mixing direct conncetion and indircet connection)between branch pipe line and the second side pipe network of heat station, and apply the X regulation method(which can conclude all the traditonal regulation laws)to this type system, derive several different regulation method combinations, and obtain different regulation law of each combination, also analysis the operation power consumption and system pressure conditions of each combination, and analysis the applicability of different combinations to different connection modes.To analysis and calculate the running regulation of double heating sources one-way ring-shaped network system, and research the running regulation in different heating stage, the numbers of heating sources running in different stages are different, and there are also different strategies when double sources are both running.