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Technical-Economic Analysis of Energy Efficiency Solutions for the Industrial Steam System of a Natural Gas Processing Plant

Author

Listed:
  • Mohsen Salimi

    (Renewable Energy Research Department, Niroo Research Institute (NRI), Tehran 14686-13113, Iran)

  • Majid Amidpour

    (Department of Mechanical Engineering, Energy Systems Division, K. N. Toosi University of Technology, No. 19, Pardis Street, Molla Sadra Ave., Vanak Sq., Tehran P.O. Box 19395-1999, Iran)

  • Mohammad Ali Moradi

    (Department of Mechanical Engineering, Energy Systems Division, K. N. Toosi University of Technology, No. 19, Pardis Street, Molla Sadra Ave., Vanak Sq., Tehran P.O. Box 19395-1999, Iran)

  • Marjan Hajivand

    (Niroo Research Institute (NRI), Tehran 14686-13113, Iran)

  • Ebrahim Siahkamari

    (South Pars Gas Complex (SPGC), Phases 1, Assaluyeh P.O. Box 75391-311, Iran)

  • Mehrzad Shams

    (Department of Mechanical Engineering, Energy Systems Division, K. N. Toosi University of Technology, No. 19, Pardis Street, Molla Sadra Ave., Vanak Sq., Tehran P.O. Box 19395-1999, Iran)

Abstract

Steam, which is primarily employed as a heat transfer medium in process plants, is one of the most widely utilized energy carriers in the industrial sector. One of the factors that affects the cost of steam is how well the condensate collection, steam supply, and return systems of industrial steam systems perform. In a case study, the steam systems of a natural gas processing plant were simulated. The amount of demineralized water loss and, consequently, the identification of various solutions to improve the system were analyzed. The whole steam system was simulated using the MEASUR software platform (v 1.2), and by placing the operational information of the steam system, it was possible to create a baseline for the system, model saving solutions, and finally, provide a technical and economic evaluation of the solutions. Due to the high loss of steam condensate in the SRU steam system (more than 3000 kg per hour), solutions to improve the energy efficiency of the SRU steam system in the form of a maximum recovery of steam condensate (replacement of defective steam traps, redesign of the low-pressure condensate collection network, and high-pressure waste condensate collection) were evaluated with two price assumptions of current energy prices and real prices (the energy saving value of one cubic meter of natural gas is equal to 13 cents). The results show that, for current prices, the investment return period will be between 11.8 and 3.8 months. Moreover, in the main steam system of the refinery (unit 9200), there are three solutions: replacing and repairing defective steam traps, installing an expansion turbine instead of a steam pressure relief valve (PRV), and other solutions (including increasing boiler efficiency, automatic control of the boiler, and energy recovery boiler blowdown) under two price assumptions, the current and real prices of natural gas and demineralized water, were evaluated, and the modeling results show that the investment return period for each of the above solutions at the current prices is 10.2, 186, and 13.3, respectively. The investment return period is based on assuming real fuel and BFW prices are equal to 2.0, 37.6, and 1.7, respectively.

Suggested Citation

  • Mohsen Salimi & Majid Amidpour & Mohammad Ali Moradi & Marjan Hajivand & Ebrahim Siahkamari & Mehrzad Shams, 2023. "Technical-Economic Analysis of Energy Efficiency Solutions for the Industrial Steam System of a Natural Gas Processing Plant," Sustainability, MDPI, vol. 15(20), pages 1-24, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:20:p:14995-:d:1261922
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    References listed on IDEAS

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