Journal of Natural Gas Science and Engineering 2018-03-30

Combined heat and power – multi-objective optimization with an associated petroleum and wet gas utilization constraint

Priambudi Pujihatma, Sasongko Pramono Hadi, Sarjiya, Tri Agung Rohmat

Index: 10.1016/j.jngse.2018.03.025

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Abstract

Associated petroleum gas and wet gas are byproducts of oil field operations. The use of both gases as low-cost, low-quality fuel in oil field operations has several downfalls, such as a low Modified Wobbe Index and high hydrogen sulfide content. Modified Wobbe Index represents fuel interchangeability which affects gas turbine reliability. High hydrogen sulfide content may result in failures on the gas pipeline. The purpose of this research is to develop a multi-objective combined heat and power optimization by considering associated petroleum and wet gas utilization. The optimization model utilizes thermodynamic equations to represent gas turbine and heat recovery steam generator performance when subjected to low-quality fuel. Optimization also considers power system parameter as constraints. Three conflicting objective functions will be considered: cost vs. Modified Wobbe Index vs. hydrogen sulfide content. Optimization will use two algorithms for comparison purposes: Goal Attainment and NSGA-II. The result shows that the optimization model can analyze the tradeoffs between the three conflicting parameters.