An integrated process of using pressure energy of natural gas to generate electricity and produce dry ice

作者：Xu, Wen-Dong; Chen, Zhong; Li, Xia-Xi; Xing, Lin-Lin; Qian, Di; Qin, Zhen

来源：Journal of South China University of Technology(Natural Science Edition), 2016, 44(11): 41-48.

DOI：10.3969/j.issn.1000-565X.2016.11.007

• Dry ice
• Exergy efficiencies
• Gas pipeline networks
• Generate electricity
• Heat Transfer enhancement
• Optimal design
• Simulation
• Thermo dynamic analysis

In view of existing technical problems and practical difficulties in the process of utilizing the pressure energy of natural gas as well as dry ice market demands, a new integrated process of using the pressure energy of na-tural gas pipeline network to generate electricity and produce dry ice is proposed. This process can help realize the power balance of isolated networks by coupling the expansion, power generation and compression processes, and it has a flexible operation, a high utilization efficiency of pressure energy and a low cost of outputting dry ice. By using the proposed process to analyze the gas usage situation in a city, it is found that, when the users'power changes within the range of 30%~60% of the generator output power, this process can steadily produce 84kg/h of dry ice through a splitter. By means of both the unit operation-based exergy analysis of the proposed process and the diagnosis of EUD, it is concluded that the exergy efficiency of the proposed process can reach up to 59.40%, and both the expander and the compressor have more exergy loss. In addition, two exchangers are the weak points of this process and it is, therefore, suggested that the design of heat transfer enhancement process should be further improved.

• 出版日期2016-11-1
• 单位华南理工大学