| Peer-Reviewed

A Study on Energy Optimization of Heat Exchangers in a Gasification System

Received: 16 May 2016     Accepted: 27 May 2016     Published: 13 June 2016
Views:       Downloads:
Abstract

The objective of this research is the optimization of energy parameters such as the temperature and flow rate of the fluid in heat exchangers in the gasification system in order to increase the recovery rate of energy in the system. A mathematical model of these heat exchangers is developed to predict their operating performance under the specified gasification system. The optimal flow rate and temperature of the fluid in the heat exchanger based on the effectiveness - number of transfer units(NTU) method is investigated. The result of the simulation shows that the optimal mass flow rate and temperature of the high pressure (HP) boiler feed water are determined at 175,907 kg/h and 110°C, respectively, while the optimal mass flow rate and temperature of high pressure saturated steam of boiler are determined at 238,430 kg/h, 290.5°C, respectively. At these values, the total heat amount obtained at these heat exchangers is highest with 169 MW. Besides, the total heat amount obtained at heat exchangers could be increased by 4.61% (7.8 MW) when sixty percent of the heat release amount from air cooler (12.78 MW) is used.

Published in International Journal of Mechanical Engineering and Applications (Volume 4, Issue 3)
DOI 10.11648/j.ijmea.20160403.14
Page(s) 123-129
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Optimization, Heat Exchanger, Gasification System, Effectiveness-NTU

References
[1] Kopyscinski J., Schildhauer T. J., Boillaz S. M. A., Production of synthetic natural gas (SNG) from coal and dry biomass – A technology review from 1950 to 2009, Fuel, Vol. 89, pp. 1763-1783, 2010
[2] Cronomarkovic N., Repic B., Neskovic O., Veljkovic M., Mladenovic R., Experimental investigation of role of steam in entrained flow coal gasification, Fuel, Vol. 86, pp. 194-202, 2007
[3] Bell D. A., Towler B. F., Fan M. H., Coal Gasification and its Applications, Oxford OX5 1GB, UK, 2011
[4] Luan Y. T., Chyou Y. P., Wang T., Numerical analysis of gasification performance via finite-rate model in a cross-type two-stage gasifier, International Journal of Heat and Mass Transfer, Vol. 57, pp. 558-566, 2013
[5] Jaojaruek K., Mathematical model to predict temperature profile and air–fuel equivalence ratio of a downdraft gasification process, Energy Conversion and Management, Vol. 83, pp. 223-231, 2014
[6] Materazzi & et al., Thermodynamic modelling and evaluation of a two-stage thermal process for waste gasification, Fuel, Vol. 108, pp. 356-369, 2013
[7] Choi Y. C., Li X. Y., Park T. J., Kim J. H., Lee J. G., Numerical study on the coal gasification characteristics in an entrained flow coal gasifier, Fuel, Vol. 80, pp. 2193-2201, 2001
[8] Morris M., Waldheim L., Energy recovery from solid waste fuels using advanced gasification technology, Waste management, Vol. 18, pp. 557-564, 1998
[9] Stoecker W. F., Design of thermal system, 3th ed. McGraw-Hill Book, pp. 82-93, 1989
[10] Incropera F. P., Dewitt D. P., Bergman T. L., Lavine A. S., Fundamentals of Heat and Mass Transfer, 6th ed. John Wiley & Sons Inc., 2006, pp. 669-723, 2006
[11] Hodge B. K., Analysis and Design of Energy system. Prentice-Hall, Inc., 1985
[12] Zedtwitz P. V., Steinfeld A., The solar thermal gasification of coal-energy conversion efficiency and CO2 mitigation potential, Energy, Vol. 28, pp. 441-456, 2003
[13] Ye D. P., Agnew J. B., Zhang D. K., Gasification of a South Australian low-rank coal with carbon dioxide and steam: kinetics and reactivity studies, Fuel, Vol. 77, pp. 1209-1219, 1998
[14] Chavan P. D., Sharma T., Mall B. K., Rajurkar B. D., Sharma B. K., Kulkarni B. D., Development of data-driven models for fluidized-bed coal gasification process, Fuel, Vol. 93, pp. 44-51, 2012
[15] Abani N., Ghoniem A. F., Large eddy simulation of coal gasification in an entrained flow gasifier, Fuel, Vol. 104, pp. 664-680, 2013
[16] Andrew J. M., Coal gasification for advanced power generation, Fuel, Vol. 84, pp. 2222- 2235, 2005
[17] Ahmed I., Gupta A. K., Evolution of syngas from cardboard gasification, Applied Energy, Vol. 86, pp. 1732-1740, 2009
[18] Kruse A., Hydrothermal biomass gasification, Journal of Supercritical Fluids, Vol. 47, pp. 391-399, 2009
[19] Erlach B., Harder B., Tsatsaronis G., Combined hydrothermal carbonization and gasification of biomass with carbon capture, Vol. 45, pp. 329-338, 2012
[20] Kakac S., Boilers, Evaporators, and Condensers, New York, John Wiley & Sons Inc., pp. 11-67, 1991
Cite This Article
  • APA Style

    Le Minh Nhut, Young-Sub Moon, Youn Cheol Park. (2016). A Study on Energy Optimization of Heat Exchangers in a Gasification System. International Journal of Mechanical Engineering and Applications, 4(3), 123-129. https://doi.org/10.11648/j.ijmea.20160403.14

    Copy | Download

    ACS Style

    Le Minh Nhut; Young-Sub Moon; Youn Cheol Park. A Study on Energy Optimization of Heat Exchangers in a Gasification System. Int. J. Mech. Eng. Appl. 2016, 4(3), 123-129. doi: 10.11648/j.ijmea.20160403.14

    Copy | Download

    AMA Style

    Le Minh Nhut, Young-Sub Moon, Youn Cheol Park. A Study on Energy Optimization of Heat Exchangers in a Gasification System. Int J Mech Eng Appl. 2016;4(3):123-129. doi: 10.11648/j.ijmea.20160403.14

    Copy | Download

  • @article{10.11648/j.ijmea.20160403.14,
      author = {Le Minh Nhut and Young-Sub Moon and Youn Cheol Park},
      title = {A Study on Energy Optimization of Heat Exchangers in a Gasification System},
      journal = {International Journal of Mechanical Engineering and Applications},
      volume = {4},
      number = {3},
      pages = {123-129},
      doi = {10.11648/j.ijmea.20160403.14},
      url = {https://doi.org/10.11648/j.ijmea.20160403.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20160403.14},
      abstract = {The objective of this research is the optimization of energy parameters such as the temperature and flow rate of the fluid in heat exchangers in the gasification system in order to increase the recovery rate of energy in the system. A mathematical model of these heat exchangers is developed to predict their operating performance under the specified gasification system. The optimal flow rate and temperature of the fluid in the heat exchanger based on the effectiveness - number of transfer units(NTU) method is investigated. The result of the simulation shows that the optimal mass flow rate and temperature of the high pressure (HP) boiler feed water are determined at 175,907 kg/h and 110°C, respectively, while the optimal mass flow rate and temperature of high pressure saturated steam of boiler are determined at 238,430 kg/h, 290.5°C, respectively. At these values, the total heat amount obtained at these heat exchangers is highest with 169 MW. Besides, the total heat amount obtained at heat exchangers could be increased by 4.61% (7.8 MW) when sixty percent of the heat release amount from air cooler (12.78 MW) is used.},
     year = {2016}
    }
    

    Copy | Download

  • TY  - JOUR
    T1  - A Study on Energy Optimization of Heat Exchangers in a Gasification System
    AU  - Le Minh Nhut
    AU  - Young-Sub Moon
    AU  - Youn Cheol Park
    Y1  - 2016/06/13
    PY  - 2016
    N1  - https://doi.org/10.11648/j.ijmea.20160403.14
    DO  - 10.11648/j.ijmea.20160403.14
    T2  - International Journal of Mechanical Engineering and Applications
    JF  - International Journal of Mechanical Engineering and Applications
    JO  - International Journal of Mechanical Engineering and Applications
    SP  - 123
    EP  - 129
    PB  - Science Publishing Group
    SN  - 2330-0248
    UR  - https://doi.org/10.11648/j.ijmea.20160403.14
    AB  - The objective of this research is the optimization of energy parameters such as the temperature and flow rate of the fluid in heat exchangers in the gasification system in order to increase the recovery rate of energy in the system. A mathematical model of these heat exchangers is developed to predict their operating performance under the specified gasification system. The optimal flow rate and temperature of the fluid in the heat exchanger based on the effectiveness - number of transfer units(NTU) method is investigated. The result of the simulation shows that the optimal mass flow rate and temperature of the high pressure (HP) boiler feed water are determined at 175,907 kg/h and 110°C, respectively, while the optimal mass flow rate and temperature of high pressure saturated steam of boiler are determined at 238,430 kg/h, 290.5°C, respectively. At these values, the total heat amount obtained at these heat exchangers is highest with 169 MW. Besides, the total heat amount obtained at heat exchangers could be increased by 4.61% (7.8 MW) when sixty percent of the heat release amount from air cooler (12.78 MW) is used.
    VL  - 4
    IS  - 3
    ER  - 

    Copy | Download

Author Information
  • Department of Thermal Engineering, Faculty of Vehicle and Energy Engineering, Ho Chi Minh City University of Technology and Education, Ho Chi Minh City, Vietnam

  • Research and Development Center, POSCO E&C, Incheon City, Republic of Korea

  • Department of Thermal Engineering, Faculty Mechanical Engineering, Jeju National University, Jeju, Republic of Korea

  • Sections