Exergy recovery during LNG regasification: Electric energy production – Part one

Dispenza, Carlo; Dispenza, Giorgio; Rocca, Vincenzo La; Panno, Giuseppe

doi:10.1016/j.applthermaleng.2008.03.036

Cited by 86 publications

(45 citation statements)

References 2 publications

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“…The ratio W NG /W LNG is higher than 20 [1]. Moreover, with regasification at hypercritical pressures, the heat exchange by the LNG side is very good and heat transfer equipment is more reliable.…”

Section: Path Ab'd'd) To Pump Natural Gas At This Pressure (D'd) Amentioning

confidence: 86%

“…In papers [1][2] main problems arising by feasibility study of a venture of this kind of Regasification facility have been extensively analyzed by Authors.…”

Section: Introductionmentioning

confidence: 99%

“…A suitable option [1][2][3] can be the production of electric energy recovering energy available as cold, using a cryogenic stream of LNG during regasification as cold source in an improved CHP Plant (Combined Heat and Power). In papers [1][2] main problems arising by feasibility study of a venture of this kind of Regasification facility have been extensively analyzed by Authors.…”

Section: Introductionmentioning

confidence: 99%

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Exergy recovery in regasification facilities – Cold utilization: A modular unit

Dispenza

Rocca

et al. 2009

Applied Thermal Engineering

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The paper deals with the problem of cold recovery for direct utilization both in the site of regasification facility and far from it.A modular LNG regasification unit is proposed having the regasification capacity of 2 billion standard cubic meters/year of gas. The modular plant is based on use of a Power Cycle working with Ethane or Ethylene which allows operation of cold energy transfer, contained in LNG to be regasified, in a range of temperatures suitable for multipurpose use of cold, reducing regasification process irreversibility. Some electric energy is produced by the Power Cycle, but the own mission of modular unit proposed is addressed to deliver cold suitable for industrial and commercial use in the proper 1 Corresponding Author -E-Mail: dispenza@unipa.it * Viale delle Scienze Parco d'Orleans, Ed. 9, 90128 Palermo, Italy, EU ** Salita Santa Lucia Sopra Contesse, 5, 98126 Messina, Italy, EU ACCEPTED MANUSCRIPT temperature range. The option considers, also, the use of Carbon dioxide as a secondary fluid for transfer of cold from regasification site to far end users. This option seems very attractive due to expected wide future exploitation of LNG regasification in the World.Results of a detailed thermodynamic and economic analysis demonstrate the suitability of the proposal.

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Section: Path Ab'd'd) To Pump Natural Gas At This Pressure (D'd) Amentioning

confidence: 86%

“…In papers [1][2] main problems arising by feasibility study of a venture of this kind of Regasification facility have been extensively analyzed by Authors.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergy recovery in regasification facilities – Cold utilization: A modular unit

Dispenza

Rocca

et al. 2009

Applied Thermal Engineering

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“…Dispenza et al [2] proposed a helium Rankine cycle using exhaust gas from a gas turbine as heat source. Angelino and Invernicci [3] investigated some working fluids for a Brayton cycle working between LNG as heat sink and gas turbine exhaust at 543°C as heat source.…”

Section: Introductionmentioning

confidence: 99%

Exergy recovery during LNG gasification using ambient air as heat source

Zoughaib

Hadid²

2017

International Journal of Thermodynamics

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The market of liquefied natural gas (LNG) is growing and presents the advantage of diversifying supplies. The LNG is fed at a temperature of -162°C and at atmospheric pressure. This study aims at the recovery of the LNG exergy during its gasification and heating before being delivered trough the network. An energy and exergy based analysis is performed for the definition of engine-cycle architectures using the ambient air as a heat source through an intermediate fluid, and LNG as a cold sink. The use of ambient air led to manage frosting problem. The intermediate two phase fluid with a controlled evaporating pressure, recovering heat from the air, is used to avoid the direct contact of humid air with very cold heat exchanger surface in order to limit the frost formation. In this paper, the challenge is to find the best engine-cycle architectures with minimized overall exergy destruction, moving up the efficiency of the entire system. Different systems including Organic Rankine cycles (ORCs) and Brayton cycles, operating as simple or cascade cycles are investigated. Pure working fluid, as well as mixtures of hydrocarbons are considered.

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“…Oliveti et al [9] proposed three sequential cycles of a water-steam-closed Rankine cycle in the waste incinerator plant, an intermediate ammonia-closed Rankine cycle, and a methane-open Rankine cycle to capture the thermal energy released from an LNG regasification terminal. Dispenza et al [10,11] conducted a feasibility study of a combined heat and power cycle using the cryogenic stream of LNG during the regasification as a cold source in a gas turbine with helium as working fluid. Wang et al [12] investigated the use of LNG cold energy as a heat sink to a Rankine cycle with transcritical CO 2 as working fluid employing the heat of geothermal water.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic assessment of integrated heat recovery system combining exhaust-gas heat and cold energy for LNG regasification process in FSRU vessel

Lee

Choi

2016

J Mech Sci Technol

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A thermodynamic assessment of an integrated heat recovery system, which simultaneously recovers both the cold energy of LNG released into seawater and the exhaust gas heat of diesel generator released into ambient air during the regasification process in a LNG-FSRU vessel, has been carried out. For the LNG regasification unit consisting of two-stage heat exchangers, a primary Rankine cycle was applied as a typical power cycle of the type A for recovering cold energy to the first-stage heat exchanger. A secondary Rankine cycle of the type B was serially inserted between the first-stage and the second-stage heat exchangers for recovery of the remaining cold energy of preheated LNG. Then, in the type C, the exhaust gas, which had a relatively high temperature, was applied as the heat source of the secondary Rankine cycle, instead of seawater. In such a sequential procedure, the type C was finally suggested as an integrated heat recovery system, in which the seawater and exhaust gas were combined as the heat sources. When the net outputs produced from each heat recovery system were maximized by changing the pressure and mass flow rate of working fluid, the thermal efficiency of the integrated heat recovery system of the type C was I,EG h = 0.0741. The results showed an improvement of approximately 13.3% (25.6%) in the thermal efficiency compared to the value of I,SW h = 0.0654 ( I h = 0.0590) for the conventional cold energy recovery system of the type B (the type A), which only used seawater as the heat source. Based on this finding, a possibility of utilizing the integrated heat recovery system with the combined cycle within the LNG-FSRU was confirmed.

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Exergy recovery during LNG regasification: Electric energy production – Part one

Cited by 86 publications

References 2 publications

Exergy recovery in regasification facilities – Cold utilization: A modular unit

Exergy recovery in regasification facilities – Cold utilization: A modular unit

Exergy recovery during LNG gasification using ambient air as heat source

Thermodynamic assessment of integrated heat recovery system combining exhaust-gas heat and cold energy for LNG regasification process in FSRU vessel

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