Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (12): 58-63.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles


Integration Analysis of LNG Cold Energy Utilization in Cryogenic Pulverization of Waste Rubber

Xiong Yong-qiang1  Hua Ben1  Li Ya-jun1  Jia De-rain2   

  1. 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China ; 2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-02-10 Revised:2009-06-30 Online:2009-12-25 Published:2009-12-25
  • Contact: 熊永强（1978-），男，博士后，主要从事LNG利用研究． E-mail:yqxiong1978@163．com
  • About author:熊永强（1978-），男，博士后，主要从事LNG利用研究．
  • Supported by:

    中国博士后科学基金资助项目（20090460765）;华南理工大学博士后科学创新基金资助项目（20080210）

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Abstract:

In order to reduce energy consumption in the production of fine rubber powders through the cryogenic pulverization of waste rubber, two integration techniques concerning LNG （Liquefied Natural Gas） cold energy utilization, namely the crushing under liquid nitrogen freezing and the cryogenic pulverization with cold nitrogen refrigeration, were proposed and then analyzed in terms of energy utilization. The results show that （ 1 ） with the utilization of LNG cold energy in the production of liquid nitrogen, the energy consumption decreases by 60. 2%, the power consumption reduces by 244. 3kW ·h per ton of LNG, the exergy efficiency reaches 60.7%, and the energy consumption of fine rubber powder production reduces by 126. 4 kW·h/t ; and （ 2 ） if the cryogenic crushing devices of waste rubber are adjacent to LNG terminals and if the by-produced cold nitrogen recovering LNG cold energy is provided for rubber powder plants to refrigerate and crush waste rubber, the energy consumption reduces by 437. 3 kW · h/t, as compared with the traditional air freezing method, the power consumption decreases by 276.3 kW · h per ton of LNG, and the exergy efficiency of LNG cold energy utilization is up to 70.7%.

Key words: liquefied natural gas, cold energy utilization, waste rubber, cryogenic pulverization, integration