Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (11): 41-48.doi: 10.3969/j.issn.1000-565X.2016.11.007

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

An Integrated Process of Using Pressure Energy of Natural Gas to Generate Electricity and Produce Dry Ice

XU Wen-dong1 CHEN Zhong1 LI Xia-xi2 XING Lin-lin2 QIAN Di2 QIN Zhen2   

  1. 1.School of Chemistry and Chemical Engineering//Key Laboratory of Heat Transfer Enhancement and Energy Conservation of the Ministry of Education,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Beijing Gas Group Co.,Ltd.,Beijing 100084,China
  • Received:2015-12-24 Revised:2016-06-23 Online:2016-11-25 Published:2016-10-04
  • Contact: 徐文东( 1972-) ，男，博士生，副研究员，主要从事天然气的高效利用和强化传热研究． E-mail:wdxu@scut.edu.cn
  • About author:徐文东( 1972-) ，男，博士生，副研究员，主要从事天然气的高效利用和强化传热研究．
  • Supported by:
    Supported by the Major Science and Technology Projects of Beijing( D151100005515001)

PDF

289

Abstract:

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 natural 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 84 kg /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.

Key words: natural gas, dry ice, coupling, simulation, optimal design, thermodynamic analysis