Feasibility study on energy recovery at Sari-Akand city gate station using turboexpander

Zabihi, Abbas; Taghizadeh, Majid

doi:10.1016/j.jngse.2016.08.054

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…Lo Cascio et al [10] proposed a set of key performance indicators for evaluating the effectiveness of the replacement in terms of energy recovery. Zabihi and Taghizadeh [11] analysed the case study of the Sari-Akand gate station (Iran), characterized by an annual pneumatic energy loss of about 7.1 GWh. In this case, the installation of a turboexpander could allow an energy production of 3.2 GWh.…”

Section: Introductionmentioning

confidence: 99%

Fast Design Procedure for Turboexpanders in Pressure Energy Recovery Applications

et al. 2020

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Sustainable development can no longer neglect the growth of those technologies that look at the recovery of any energy waste in industrial processes. For example, in almost every industrial plant it happens that pressure energy is wasted in throttling devices for pressure and flow control needs. Clearly, the recovery of this wasted energy can be considered as an opportunity to reach not only a higher plant energy efficiency, but also the reduction of the plant Operating Expenditures (OpEx). In recent years, it is getting common to replace throttling valves with turbine-based systems (tuboexpander) thus getting both the pressure control and the energy recovery, for instance, producing electricity. However, the wide range of possible operating conditions, technical requirements and design constrains determine highly customized constructions of these turboexpanders. Furthermore, manufacturers are interested in tools enabling them to rapidly get the design of their products. For these reasons, in this work we propose an optimization design procedure, which is able to rapidly come to the design of the turboexpander taking into account all the fluid dynamic and technical requirements, considering the already obtained achievements of the scientific community in terms of theory, experiments and numeric. In order to validate the proposed methodology, the case of a single stage axial impulse turbine is considered. However, the methodology extension to other turbomachines is straightforward. Specifically, the design requirements were expressed in terms of maximum allowable expansion ratio and flow coefficient, while achieving at least a minimum assigned value of the turbine loading factor. Actually, it is an iterative procedure, carried out up to convergence, made of the following steps: (i) the different loss coefficients in the turbine are set-up in order to estimate its main geometric parameters by means of a one dimensional (1D) study; (ii) the 2D blade profiles are designed by means of an optimization algorithm based on a “viscous/inviscid interaction” technique; (iii) 3D Computational Fluid Dynamic (CFD) simulations are then carried out and the loss coefficients are computed and updated. Regarding the CFD simulations, a preliminary model assessment has been performed against a reference case, chosen in the literature. The above-mentioned procedure is implemented in such a way to speed up the convergence, coupling analytical integral models of the 1D/2D approach with accurate local solutions of the finite-volume 3D approach. The method is shown to be able to achieve consistent results, allowing the determination of a turbine design respectful of the requirements more than doubling the minimum required loading factor.

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Section: Introductionmentioning

confidence: 99%

Fast Design Procedure for Turboexpanders in Pressure Energy Recovery Applications

et al. 2020

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“…They calculated the overall exergy efficiency of the combined CGS/PEM-RC system up to 47.9%. Zabihi and Taghizadeh [25] simulated a CGS with a nominal capacity of 120,000 SCMH using HYSYS software for energy harvesting by turboexpanders and concluded that the pressure energy of NG lost during regulation was 7.1 GWh, and the annual turboexpander electricity production was computed to be 3.2 GWh. The reciprocating expansion engines were also proposed by Farzaneh-Gord et al [26] as well for energy harvesting from the pressure reduction process in TBS.…”

Section: Introductionmentioning

confidence: 99%

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

2020

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A countless amount of energy has been wasted in all kinds of expansion valves (EV) in industries. In fact, EVs, including regulators, throttling valves, capillary tubes, etc., have been used to intentionally reduce the potential of carrier fluid. City gate stations (CGS) have been recognized as one of the important points with high potential for energy harvesting due to its function for regulating natural gas (NG) pressure by EV. In this study, Tesla turbine (TT) is introduced as a new candidate for substitution of EV, particularly those that have been employed in CGS on high-pressure NG pipelines, as well as those applications in which high-potential fluid must be reduced to a low-potential state to form a complete thermodynamic cycle or to be used at end-user equipment. Although harvesting energy is one of the hottest fields of science and engineering, there are few traces of research on using a TT as an alternative for EVs, even for the industries possessing high-pressure lines. This numerical experiment intends to show the capability of TT as a robust candidate for substituting regulation valves through investigating thermohydrodynamic characteristics of the turbulent high-pressure compressible NG flow through a TT under different operation conditions. This study, with the objective of managing the exploitation of resources, can be considered as one step forward toward reinforcing economic and environmental pillars of sustainable development. It is also found that the generated power by TT can support the 285 7W LED simultaneously, or it is equivalent to 84.4 m2 area of the solar panel (150 W, 15.42% efficiency) for the climate condition of Toronto, Canada.

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“…They showed that the flow rate fluctuations in different seasons alter the amount of electric power generated by the expander. Zabihi and Taghizadeh (2016) studied the Sari-Akand CGS station for recovering exergy loss in a choke valve. They revealed the annual energy loss of 7.1 GWh can be reduced to 3.9 GWh by using an expansion turbine where it is only operational for seven months due to flow rate fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Power Recovery in a Gas Pressure Reduction Station using 3D CFD Modeling of a Twin Screw Expander

Abolhasani¹,

Moghimi²,

Ebrahimi³

2020

JAFM

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The limitation of energy resources in the world has cut the attention of many researchers to find new resources of clean energy and develop methods for recovering exergy losses. Twin screw expander (TSE) is one of the positive displacement machines that has been widely applied in recent years to recover mechanical power from fluids due to its lower installation, operation, and maintenance costs in comparison with common expansion turbines (CET). In this paper, technical and economic conditions of a city gate station (CGS) were studied with the aim of recovering exergy loss using a TSE. A computational fluid dynamic code was used to simulate the three-dimensional fluid flow in the TSE. The simulation results for Shahroud station -a CGS located in the east of Iran-revealed that, unlike CET, flow and pressure fluctuations in different seasons of the year did not put any restrictions on the use of TSE whereby 85.3% of annual loss exergy was recovered. Economic studies showed that the internal rate of return (IRR) and payback period of TSE utilization were obtained of 27.6% and 4.4 years, respectively, making the investment in CGS stations more practical compared to the CET.

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Feasibility study on energy recovery at Sari-Akand city gate station using turboexpander

Cited by 26 publications

References 8 publications

Fast Design Procedure for Turboexpanders in Pressure Energy Recovery Applications

Fast Design Procedure for Turboexpanders in Pressure Energy Recovery Applications

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

Power Recovery in a Gas Pressure Reduction Station using 3D CFD Modeling of a Twin Screw Expander

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