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Modeling and optimizing a CHP system for natural gas pressure reduction plant

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  • Sanaye, Sepehr
  • Mohammadi Nasab, Amir

Abstract

The pressure in the main natural gas transport pipelines should be reduced for proper consumption in vicinity of cities. A common procedure of reducing pressure in natural gas station (city gate station, CGS) is using expansion valves, which causes the waste of large amount of exergy (availability). In this paper a combined heat and power (CHP) system was used instead which included an expander, gas engines, boilers, a pump and a preheater. A new and relatively quick method for selecting the required number of gas engine/boiler, and determining their nominal power/heating capacity, as well as the expander efficiency are also presented. An objective function named actual annual benefit ($) was defined as the sum of income (from selling electricity) and expenses (such as investment cost, operation and maintenance costs). Subsequently different parts of the objective function were expressed in terms of 9 decision variables. The optimum values of decision variables were obtained by maximizing the objective function using genetic algorithm optimization technique. By applying the above procedure for our case study, it was obtained that two 5.48 (MW) gas engines and one 5.94 (MW) boiler was needed while the payback period was found to be 1.23 (year).

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  • Sanaye, Sepehr & Mohammadi Nasab, Amir, 2012. "Modeling and optimizing a CHP system for natural gas pressure reduction plant," Energy, Elsevier, vol. 40(1), pages 358-369.
    • Handle: RePEc:eee:energy:v:40:y:2012:i:1:p:358-369
    DOI: 10.1016/j.energy.2012.01.060
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    13. Farahnak, Mehdi & Farzaneh-Gord, Mahmood & Deymi-Dashtebayaz, Mahdi & Dashti, Farshad, 2015. "Optimal sizing of power generation unit capacity in ICE-driven CCHP systems for various residential building sizes," Applied Energy, Elsevier, vol. 158(C), pages 203-219.
    14. Fausto Cavallaro & Edmundas Kazimieras Zavadskas & Saulius Raslanas, 2016. "Evaluation of Combined Heat and Power (CHP) Systems Using Fuzzy Shannon Entropy and Fuzzy TOPSIS," Sustainability, MDPI, vol. 8(6), pages 1-21, June.
    15. Guoqiang Li & Yuting Wu & Yeqiang Zhang & Ruiping Zhi & Jingfu Wang & Chongfang Ma, 2016. "Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System," Energies, MDPI, vol. 10(1), pages 1-14, December.
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    20. Ghezelbash, Reza & Farzaneh-Gord, Mahmood & Behi, Hamidreza & Sadi, Meisam & Khorramabady, Heshmatollah Shams, 2015. "Performance assessment of a natural gas expansion plant integrated with a vertical ground-coupled heat pump," Energy, Elsevier, vol. 93(P2), pages 2503-2517.
    21. Kabalina, Natalia & Costa, Mário & Yang, Weihong & Martin, Andrew, 2017. "Energy and economic assessment of a polygeneration district heating and cooling system based on gasification of refuse derived fuels," Energy, Elsevier, vol. 137(C), pages 696-705.

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