基于燃气轮机的天然气冷热电联供系统优化配置研究

发布时间：2018-03-05 04:27

本文选题：天然气　切入点：冷热电联供系统　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着经济社会的发展,我国的能源消耗大大增加,能源已经成为制约经济发展的一个重要瓶颈。为了促进经济与社会的发展,调整能源结构,提高能源利用率已经成为我国能源战略的重点。建筑能耗在社会总能耗中所占比重较大且增长迅速,降低建筑能耗对降低我国社会总能耗具有重要意义。为了降低建筑能耗,一方面要推行建筑节能工作,另一方面要提高能源利用率,降低一次能源消耗。冷热电联供系统是一种将制冷、供热和发电过程一体化的多联产能源系统,该系统由于实现了能量的梯级利用,所以大大提高了能源的利用率,特别是降低了能源的品位损失,这可以有效的降低建筑能耗。本文首先通过建立系统主要设备的热力学、经济学和排放特性模型,以系统内部能量流动为平衡关系,以典型天时段为时间划分,按照分时段能流平衡的原则建立起了四种典型天然气冷热电联供的系统数学模型；然后以长沙市某医院为例,在燃气轮机额定发电功率从1000kW增长到20000kW的情况下,分别求出不同燃气轮机额定功率时系统最优的20年期年度化费用值并进行比较,得出年度化费用最低值及对应的系统容量配置和运行策略；接下来对四种方案年度化费用最低值时的最优化配置方案进行经济性能、热力学性能、环境性能和社会性能的综合比较,得出最优方案；最后对选出的最优方案进行经济性不确定性研究,确定出适合采用天然气冷热电联供系统的能源价格范围和不同售电价格对联供系统优化配置及运行策略的影响。本文所研究的天然气冷热电联供系统优化计算的思路、数据和结论可以为天然气冷热电联供的系统选型、优化计算、运行策略等提供一种可行的方法,同时本文得出的优化结果也可以对天然气冷热电联供系统在湖南地区的发展提供一定的参考。
[Abstract]:With the development of economy and society, energy consumption in our country has increased greatly. Energy has become an important bottleneck restricting economic development. In order to promote economic and social development, the energy structure has been adjusted. Improving energy efficiency has become the focus of our country's energy strategy. Building energy consumption accounts for a large proportion of the total energy consumption in the society and grows rapidly. It is important to reduce building energy consumption to reduce the total energy consumption of our country in order to reduce the building energy consumption. On the one hand, it is necessary to promote energy conservation in buildings, on the other hand, to increase energy efficiency and reduce primary energy consumption. The combined cooling and heat supply system is a multi-generation energy system that integrates refrigeration, heating and power generation processes. Because of realizing the cascade utilization of energy, the system greatly improves the energy utilization rate, especially reduces the loss of energy grade, which can effectively reduce the building energy consumption. Firstly, the thermodynamics of the main equipment of the system is established in this paper. Based on the equilibrium relation of energy flow in the system and the time division of typical days and periods, the mathematical models of four typical natural gas cooling and heat combined power supply systems are established according to the principle of energy flow equilibrium in different periods of time in economics and emission characteristic models. Then taking a hospital in Changsha as an example, when the rated power of gas turbine is increased from 1000kW to 20000kW, the optimal annual cost of the system for different rated power of gas turbine is calculated and compared. The lowest value of annual cost and the corresponding system capacity configuration and operation strategy are obtained. Then, the economic performance and thermodynamic performance of the optimal configuration scheme with the lowest annual cost of the four schemes are carried out. Comparing the environmental performance with the social performance, the optimal scheme is obtained. Finally, the economic uncertainty of the selected optimal scheme is studied. The effects of energy price range and different selling price on the optimal configuration and operation strategy of natural gas combined cooling and heat supply system are determined. In this paper, the idea of optimal calculation of natural gas cooling and heat combined power supply system is studied. The data and conclusions can provide a feasible method for the system selection, optimization calculation, operation strategy and so on. At the same time, the optimized results obtained in this paper can also provide some reference for the development of natural gas combined cooling and heat supply system in Hunan region.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM61;TU83

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