【作者】 李旭；

【导师】 由世俊；

【作者基本信息】 天津大学 ， 供热、供燃气、通风及空调工程， 2012， 硕士

【摘要】 随着全球能源结构的调整和社会经济的发展，各个国家都在积极建设第二代能源系统，分布式冷热电三联供系统是一种建立在能源梯级利用的概念基础上，将发电、制冷、供热过程一体化的多联供总能系统，是一种典型的第二代能源供应系统。首先，本文主要针对目前冷热电三联供系统在设计时忽略动态负荷的影响，配置选型偏大的问题，建立了内燃机和烟气热水直燃机联合运行的冷热电三联供系统的数学模型，并给出数学模型的约束条件。其次，以天津市某酒店建筑为工程背景，使用eQUEST模拟建筑的逐时冷热电负荷作为基础，分别取年总费用、一次能源消耗和二氧化碳排放量为单目标函数，取综合性能指标PFI为综合目标函数，并以内燃机配置容量为设计变量，改变内燃机的参考容量值，在以电定热、以热定电和混合热电的运行策略下，得到不同目标函数所对应的最优内燃机容量及对应的运行策略，通过优化结果与传统峰值选型结果、分供系统进行对比分析，考察系统的经济性、节能性和减排性。以此对分布式冷热电三联供系统的设计提供可借鉴的思路和方法。建议采用综合性能指标为目标函数对联供系统进行评价，优化结果为：内燃机的参考容量为975kW，运行策略为以电定热，年总费用为652万元，一次能源消耗为61626GJ，CO2排放量为3652t/a，PFI为0.792，此结果与分供系统相比节钱3.6%，节能28.9%，减排44.7%。最后通过电价敏感性分析、气价敏感性分析、冬夏节能潜力分析，指出联供系统的选择具有一定的适应性，且模拟得到的全年逐日逐时内燃机效率和系统能源消耗，可以为联供系统实际投入运行时的检测及自动控制提供参考。总之，本文通过建立数学模型和实例应用分析，提出了联供系统优化设计的方法，为提高联供系统的实际运行性能奠定了基础。更多还原

【Abstract】 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.更多还原