Optimum Design Research Of The Combined Cooling Heating And Power System Based On Combustion Engine And Direct-fired Absorption Chiller

Along with the adjustment of global energy structure and the development ofsocial economy, All countries construct the second generation of energy systemenergetically. The distributed combined cooling, heating and power system, whichintegrates power generation, cooling and heating, is a type of total energy system onthe basis of energy cascade utilization principle, is a typical kind of the secondgeneration of energy supply system.Firstly, this article mainly aims at the problems of ignoring the influence ofdanamic load and configuration selection bias big in the design phase of the CCHPsystem, the mathematical model of the CCHP system was established, which based oncombustion engine and flue gas hot water direct-fired absorption chiller, and gave theconstraint conditions of the model.Secondly, took a hotel building in Tianjin as the engineering background, useeQUEST to simulate the building’s hourly heating, cooling and power load, and will itas the foundation. Took minimum total annual cost, primary energy consumption andcarbon dioxide emissions as single objective function respectively, took performancefactor indicator PFI as comprehensive objective function, took the combustion enginecapacity configuration. Changed the internal combustion engine reference capacityvalue, in condition of the three system operation strategies, which are following theelectric load, following the thermal load and following hybrid electric–thermal load,got the optimal internal combustion engine capacity and operation strategy ofdifferent objective functions, through contrasting and analyzing the optimizationresult with the traditional peak selection results and separate production system,investigated the performance of economy, energy conservation and emission reductionof system. On this account, provide the referential ideas and methods to design theCCHP system.The optimization results of comprehensive objective function are recommended—the internal combustion engine reference capacity is975kW, operation strategy isfollowing the electric load, the total cost is6.52million yuan, primary energyconsumption is61626GJ, CO2emission is3652t/a, PFI is0.792. The resultscompared to separate production system, the cost reduction, energy saving and carbon dioxide emissions reduction are3.6%,28.9%and44.7%.Finally, thourgh the electricity price sensitivity analysis, gas price sensitivityanalysis, seasonal sensitivity analysis, pointed out that the choice of system hascertain adaptability, and got the hourly efficiency of the combustion engine andenergy consumption day by day by simulating, can provide the reference value to thedetection and automatic control of the CCHP system’s actual operation.In a word, by establishing mathematical model and an application exampleanalysis, this paper put forward a optimization design method for the CCHP system,laid a foundation in order to improve the actual operation performance of the system.