Research On Combination Model Of The12MW Back-pressure Units And Peaking Boiler

As the increasing development in urbanization construction, and in the context ofenergy conservation and energy structure adjustment, combined heating system withmultiple heat sources has been more widely used. In the multiple heat sources system,the main heating source is thermal power plants, and peaking heating source iscoal-fired boiler or gas boiler room. Researchers had made a lot of studies of combinedheating systems for multi-heats, including the size of the heating system and economicevaluation of heating system. However, many of these studies are aimed at large-scalecogeneration units. Under the trend of the larger the better, heating units for smallbackpressure insufficient attention. In this regard, based on the analysis of the form andcharacteristics of combined heating system with multiple heat sources, and analysis ofsmall back-pressure thermal power generating units in the cold area. And furtherintegrate technical and economic methods and energy savings calculation, makeAnalysis of optimal allocation of heat source heating system with small back pressurecogeneration units and coal-fired boil.This paper analyzes the forms, connections and characteristics of heat combinedheating systems, compare the large condensate pumping unit with small heating unitsbackpressure in dynamic characteristics, applicability. By analyzing the results, indistrict with adequate power and long heating time, with small back-pressurecogeneration units bear the heat load in heating period is more energy-saving.For heating system with small backpressure heating units as main heat source,regional coal-fired boilers as peaking heat, establish a technical and economicevaluation model, make the dynamic annualized cost as objective function, and comparedifferent thermal coefficients of the system unit for heat calculation costs, to determinethe optimal heating load of the main heat source and heat combined mode. And thenestablish energy savings calculation equation, to analyze the effects of thermalcoefficient. Finally, combine with dynamic analysis to determine the price of coal, theinitial investment, the economic impact on the system.Based on the heating system with12MW backpressure cogeneration units as mainheating source, coal-fired boilers as peaking source, compare economic of system withdifferent thermal coefficients. We get that in Harbin regions, the optimum thermal coefficient values in the range0.6~0.8, and the system’s energy saving increase with theheating coefficient getting bigger. The best coefficient values are more sensitive toinvestment. Through this study, It provides a reference in heat source configured, withthe condition of heating system renovation or new construction of central heatingsystem.