工业园区天然气冷热电联产系统技术经济性分析

发布时间：2018-01-03 21:12

本文关键词：工业园区天然气冷热电联产系统技术经济性分析　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：冷热电联产系统建立在能量的梯级利用基础上,具有高效、环保、可靠性高等优点,随着西气东输工程的进一步拓展和对环境保护问题的日益重视,天然气冷热电联产将成为我国未来能源技术的重要发展方向。如何实现系统的优化设计,提高系统的技术经济性也成为亟待解决的问题。本文以工业园区为研究对象,首先分别从制冷系统能耗和系统(?)效率的角度比较基于汽轮机、燃气轮机和燃气-蒸汽联合循环机组的三种区域冷热电联产系统方案的性能。研究结果表明,与电压缩式制冷系统相比,基于燃气轮机、燃气-蒸汽联合循环机组的吸收式制冷系统能够降低供冷能耗,对以汽轮机为原动机的联产系统方案而言,系统需要配置高压及以上压力级的汽轮机。基于燃气轮机和联合循环机组的联产系统(?)效率高于基于汽轮机的系统。然后,建立基于燃气-蒸汽联合循环机组的冷热电联产系统数学模型,分析机组参数对系统节能性的影响,并根据单耗分析理论,找到该联产系统能量利用的薄弱环节,为系统节能提供方向性指导。研究结果表明,提高余热锅炉高压蒸汽压力,降低蒸汽温度有利于提高冷热电联产系统的相对节能率。低压蒸汽参数对联产系统的性能影响较小,但对余热锅炉的当量热效率影响较大。燃烧室和余热锅炉是系统能量利用过程中的薄弱环节。最后,计算比较了不同区域供冷供热冷热源方案在长沙地区的全年能耗和经济性。与常规中央空调系统相比,区域供冷供热可显著降低冷热源系统的年一次能耗。蒸汽吸收式制冷机+水源热泵的联产型区域冷热源方案的年一次能耗最低,但其全寿命周期成本较高。本文研究结果对区域冷热电联产系统的优化设计有一定参考价值。
[Abstract]:The cogeneration system is based on the cascade utilization of energy and has the advantages of high efficiency, environmental protection and high reliability. With the further development of West-to-East gas transmission project and the increasing attention to environmental protection problems. Natural gas cogeneration of cold, heat and power will become an important direction of energy technology development in China in the future, and how to optimize the design of the system and improve the technical economy of the system has become an urgent problem to be solved. In this paper, the industrial park as the research object, first of all, from the refrigeration system energy consumption and system? The performance of three regional cogeneration systems based on steam turbine, gas turbine and gas-steam combined cycle is compared. The results show that the performance of the system is compared with that of the electric compression refrigeration system. Based on gas turbine, the absorption refrigeration system of gas-steam combined cycle unit can reduce the cooling energy consumption. The system needs to be equipped with steam turbines of high pressure and above. Joint production systems based on gas turbines and combined cycle units? The efficiency is higher than the system based on steam turbine. Then, the mathematical model of cogeneration system based on gas-steam combined cycle is established, and the influence of unit parameters on the energy saving of the system is analyzed, and the theory of unit consumption analysis is used. Find out the weak link of energy utilization of the cogeneration system, and provide directional guidance for energy saving of the system. The research results show that the high pressure steam pressure of the waste heat boiler can be improved. Lowering the steam temperature can improve the relative energy saving rate of the cogeneration system, and the low pressure steam parameters have little effect on the performance of the cogeneration system. The combustion chamber and the waste heat boiler are the weak links in the process of energy utilization. Finally, the annual energy consumption and economy of different district cooling and heating source schemes in Changsha are calculated and compared with those of conventional central air conditioning system. Regional cooling and heating can significantly reduce the annual energy consumption of the cold and heat source system, and the annual energy consumption of the joint generation regional cooling and heat source scheme of the steam absorption refrigerator water source heat pump is the lowest. However, the cost of the whole life cycle is high. The results of this paper have some reference value for the optimization design of the cogeneration system of regional cooling, heat and electricity.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU99;TM61

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