Energy and exergy analysis of reciprocating natural gas expansion engine based on valve configurations

Jannatabadi, Mohsen; Farzaneh–Gord, Mahmood; Rahbari, Hamid Reza; Nersi, Abolfazl

doi:10.1016/j.energy.2018.06.103

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Consequently, it has resulted in a change in outlet conditions (pressure and temperature). Therefore, the changes in the outlet enthalpy for all samples were obtained and recorded in figure (2).…”

Section: A) Effect Of Methane Concentration Variation On Outlet Enthalpy:using Constant Operating Conditionsmentioning

confidence: 99%

“…Throttling valves are used to reduce the gas pressure where the physical exergy of high pressure gas is wasted. [1][2][3][4][5] Energy recovery from natural gas distribution network is a strategy for sustainable energy in the urban area. 6 For energy recovery purposes, the pressure drop can be exploited through dynamic or volumetric expanders by obtaining mechanical energy and thus electricity.…”

Section: Introductionmentioning

confidence: 99%

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Exergy Analysis of a Turbo Expander: Modeling and Simulation

El-Husseiny¹,

Farouq

Farag³

et al. 2021

ACSi

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Natural gas is a mixture that is widely used in the industries. Knowledge of its thermodynamic properties is essential for evaluating the process and equipment performance. This paper quantifies the energy that can be extracted from natural gas using a turbo expander. Natural gases of wide-ranging compositions collected from 6 different gas fields in Egypt were investigated based on energy and exergy analysis. The study was conducted using MATLAB. Numerous simulation runs were made by taking various typical feed compositions classified as lean and rich. The effects of increasing the amount of C1, C5 in the feed stream on the efficiency of energy utilization are presented. A validation analysis was performed. The results show similar trends and good agreements. It was concluded from the results that when the concentration of methane in the gas mixture increase, the exergetic efficiency decreases. The results also show that the values of thermodynamic properties depend on the relative amount of heavy components in the feed stream.

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Section: A) Effect Of Methane Concentration Variation On Outlet Enthalpy:using Constant Operating Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of a Turbo Expander: Modeling and Simulation

El-Husseiny¹,

Farouq

Farag³

et al. 2021

ACSi

View full text Add to dashboard Cite

show abstract

“…They found that the expander was able to achieve an isentropic efficiency of about 60% working with expansion ratio of 2. Some works deal with the optimization of reciprocating piston expanders using exergy analysis in energy recovery applications in natural pressure reduction stations [13,14]. They all suggest that this expansion system could have a high potential in the proposed application.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Feasibility of Energy Recovery from Pressure Reduction Stations in Natural Gas Distribution Networks

2020

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A big amount of the pressure energy content in the natural gas distribution networks is wasted in throttling valves of pressure reduction stations (PRSs). Just a few energy recovery systems are currently installed in PRSs and are mostly composed of radial turboexpanders coupled with cogeneration internal combustion engines or gas-fired heaters providing the necessary preheating. This paper clarifies the reason for the scarce diffusion of energy recovery systems in PRSs and provides guidelines about the most feasible energy recovery technologies. Nine thousand PRSs are monitored and allocated into 12 classes, featuring different expansion ratios and available power. The focus is on PRSs with 1-to-20 expansion ratio and 1-to-500 kW available power. Three kinds of expanders are proposed in combination with different preheating systems based on boilers, heat pumps, or cogeneration engines. The goal is to identify, for each class, the most feasible combination by looking at the minimum payback period and maximum net present value. Results show that small size volumetric expanders with low expansion ratios and coupled with gas-fired heaters have the highest potential for large-scale deployment of energy recovery from PRSs. Moreover, the total recoverable energy using the feasible recovery systems is approximately 15% of the available energy.

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