余压发电系统的模拟计算与实验研究

发布时间：2018-02-21 01:40

  本文关键词： 余压 冷能 发电 螺杆膨胀机 模拟计算 实验研究　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着全球范围内能源供需矛盾和环境压力的日益突出,完善能源回收利用体系,提高能源综合利用效率已经成为促进我国经济社会可持续发展的重要举措。我国工业生产中伴生有大量的余压能未被有效利用,余压发电系统可以将工质余压能转化为高品质的电能,直接用于生产或并入电网,不受工艺、市场、运输等条件的限制,适应性广,是一种最实际可行且最可能大规模化应用的余压能利用方式,具有极大的市场潜力和经济效益。针对我国工业余压资源利用现状,本文就气体余压发电系统进行深入研究。利用Aspen Plus软件就天然气输运系统中的余压发电系统进行模拟计算,分析了系统运行的经济效益,证实了研究的实际可行性。编制的人机交互界面软件,省掉了繁琐的物性计算过程,可以方便地应用于工程的前期设计计算。在理论分析的基础上设计并搭建了10 kW余压发电系统实验装置,进行实验测试和验证,为工业化余压发电系统的设计作指导。余压发电系统的设计选型,一定要做到工质参数与机组性能恰当匹配,方可以使系统各设备的能力得以充分发挥,从而提高能量回收利用效率。余压发电系统实验装置选择螺杆膨胀机完成余压能向机械能的转化,系统发电量由工质质量流量、进口参数、出口背压以及发电机效率等因素决定,其中膨胀机的转速是影响系统发电效率的关键。实验结果显示2500 r/min是膨胀机运行的最佳转速,此时系统效率最高,其有效效率可达0.57,系统?效率为0.51,空气进出口实际温降为56℃。建立余压冷能联合发电系统,完成余压发电系统与有机朗肯循环发电系统的有机耦合,充分回收工业余压能以及工质膨胀降压过程产生的优质冷能,同时还可以从低品位的热源中获取能量转化为高品质电能,具有极大的经济与环境效益,是一种余压余热利用的新方法,值得进行深入的研究。
[Abstract]:With the increasing contradiction between energy supply and demand and environmental pressure in the world, the energy recovery and utilization system has been improved. Improving the efficiency of comprehensive utilization of energy has become an important measure to promote the sustainable development of our country's economy and society. The surplus pressure power generation system can convert the excess pressure energy of the working fluid into high quality electric energy, which can be directly used to produce or merge into the power grid, without the restrictions of technology, market, transportation and so on, so it has wide adaptability. Is the most practical and feasible and most likely large-scale application of residual pressure energy utilization mode, with great market potential and economic benefits. In view of the current situation of utilization of industrial residual pressure resources in China, In this paper, the gas residual pressure power generation system is deeply studied. The simulation calculation of the gas residual pressure power generation system in the natural gas transportation system is carried out by using Aspen Plus software, and the economic benefit of the system operation is analyzed. The practical feasibility of the study is verified. The man-machine interface software is developed, which saves the complicated calculation process of physical properties. On the basis of theoretical analysis, the experimental device of 10kW surplus pressure generation system is designed and built, and the experimental test and verification are carried out. In order to guide the design of the industrial surplus pressure generation system, the design and selection of the surplus pressure generation system must match the working fluid parameters with the unit performance properly, so that the capacity of each equipment of the system can be brought into full play. In order to improve the efficiency of energy recovery and utilization, the experimental device of residual pressure generation system selects screw expander to complete the conversion of residual pressure energy to mechanical energy. The output back pressure and generator efficiency are determined, among which the speed of the expander is the key to the generation efficiency of the system. The experimental results show that 2500 r / min is the best speed of the expander, and the system efficiency is the highest. Its effective efficiency can reach 0.57, system? The efficiency is 0.51, and the actual temperature of air inlet and outlet drops to 56 鈩，

本文编号：1520632