Thermodynamic analysis and optimization of a two-stage organic Rankine cycle for liquefied natural gas cryogenic exergy recovery

Xue, Xiaodi; Cong, Gao; Du, Xiaoze; Yang, Linlin; Yang, Yongping

doi:10.1016/j.energy.2015.02.088

Cited by 87 publications

(19 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the first step, a mathematical model is developed using Engineering equation solver (EES) software to simulate CORC at the same given conditions expressed in [24]. As presented in Table 1, a decent agreement can be observed between the results obtained from the present work and those reported by Xue et al [24]. Moreover, verification of MR cryogenic subsystem modeling is present in [12], [14], [18] and [13], respectively.…”

Section: Validationsupporting

confidence: 76%

“…Table 3. Input values of the main parameters for simulation of proposed system [2,24,29]. (kPa) 1500-5500 P H1 (kPa) 2000-2850 P N2-2 (kPa) 100-120 P 5 (kPa) 1500-5050 P N10 (kPa) 1000-1035 Table 6.…”

Section: Discussionmentioning

confidence: 99%

“…The combined cooling and power CORC introduced in the solar subsystem is a developed layout of CORC proposed by [24] which is composed of only two ORCs to produced power. In the first step, a mathematical model is developed using Engineering equation solver (EES) software to simulate CORC at the same given conditions expressed in [24]. As presented in Table 1, a decent agreement can be observed between the results obtained from the present work and those reported by Xue et al [24].…”

Section: Validationmentioning

confidence: 99%

See 2 more Smart Citations

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Boyaghchi

Sohbatloo

2019

Scientia Iranica

View full text Add to dashboard Cite

In this research, a combined cascade organic Rankine cycle (CORC) and ejector refrigeration loops incorporated with the concentrating linear Fresnel solar collector (LFSC) is proposed as a pre-cooling section to reduce electricity work consumption in a mixed refrigerant (MR) hydrogen liquefaction process. The exergy, exergoeconomic and exergoenvironmental analyses of the system during a year and special days are conducted in detail. Moreover, the annual thermodynamic, economic and environmental impact (EI) performances of the proposed system are evaluated by varying the substantial design parameters. Parametric study indicates that increasing the back pressure of turbine in the low temperature (LT) loop improves all aforementioned performances of the system. Meanwhile, bi-objective optimization based on nondominated sorting genetic algorithm (NSGA-II) and LINMAP, TOPSIS and Shannon entropy decision makers are used to ascertain the optimum COP Ex and economic/EI factors of the system concerned. Referring to the results, COP Ex is improved by 10% and the cost and EI per exergy

show abstract

Section: Validationsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

See 1 more Smart Citation

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Boyaghchi

Sohbatloo

2019

Scientia Iranica

View full text Add to dashboard Cite

show abstract

“…The review of previous studies on power generation using LNG cold energy is summarized in Table 1 [23]. [28] 2014 ORC with/without DEC zeotropic 30 °C Lee et al [29] 2014 ORC with CO 2 capture ternary 87.7 °C Kim et al [30] 2015 cascade ORC binary 25 °C Soffiato et al [26] 2015 ORC with career engine 6 fluids 76 °C Xue et al [27] 2015 cascade ORC R227ea, R116 120 °C Exergy analysis is a powerful and effective tool for designing and analyzing energy systems by combining the conservation of mass and energy principles with the second law of thermodynamics [31]. This study performed energetic and exergetic analyses of a combined power cycle consisting of ORC and LNG Rankine cycles, where LNG is used to produce power output, as well as to condense the working fluid of ORC as a heat sink.…”

Section: Introductionmentioning

confidence: 99%

“…Xue et al [27] conducted an analysis of a two-stage ORC with the low-grade heat of the exhaust flue gas of a gas-steam combined cycle power-generating unit, as well as the cryogenic energy of LNG. R227ea and R116 are selected as working fluids for the system.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analyses of a Combined Power Cycle Using the Organic Rankine Cycle and the Cold Energy of Liquefied Natural Gas

Lee

Kim

2015

Entropy

View full text Add to dashboard Cite

Abstract:In this work, energy and exergy analyses are carried out for a combined cycle consisting of an organic Rankine cycle (ORC) and a liquefied natural gas (LNG) Rankine cycle for the recovery of low-grade heat sources and LNG cold energy. The effects of the turbine inlet pressure and the working fluid on the system performance are theoretically investigated. A modified temperature-enthalpy diagram is proposed, which can be useful to see the characteristics of the combined cycle, as well as the temperature distributions in the heat exchangers. Results show that the thermal efficiency increases with an increasing turbine inlet pressure and critical temperature of the working fluid. However, the exergy efficiency has a peak value with respect to the turbine inlet pressure, and the maximum exergy efficiency and the corresponding optimum turbine inlet pressure are significantly influenced by the selection of the working fluid. The exergy destruction at the condenser is generally the greatest among the exergy destruction components of the system.

show abstract

Optimizing Air Separation and LNG Cold Utilization: Energy Savings, Exergy Efficiency, and System Reliability

Shingan,

Pujari,

Arya

et al. 2024

Chem Eng & Technol

View full text Add to dashboard Cite

Air separation processes are time‐consuming and energy‐intensive. Most of the energy used in air separation unit (ASU) is used for air compression. During the air compression process, some energy is lost, which is converted into waste heat. This wasted energy is used to warm liquefied natural gas (LNG). At some point, LNG ships will dock at an LNG regasification facility. Here, LNG is converted back to gas and supplied to the distribution and transmission systems. During the regasification process, cryogenic LNG has a huge opportunity for cold energy recovery. An innovative air separation process that is integrated with the cold utilization of LNG is presented in this study along with a thorough conceptual design and analysis. The results of this study show that producing high‐purity oxygen and nitrogen, respectively, requires 0.28 kWh kg−1 and 0.06 kWh kg−1 of specific energies. Prior to integration with cold utilization of natural gas, 25 141.6 kW is needed for air compression. However, following integration, 10 554.6 kW of energy is needed, resulting in a 58.01 % energy savings. Exergy destruction as well as efficiency have been calculated for the primary components of the system. Sensitivity analysis is carried out to examine the effects of LNG streams on important parameters. In conclusion, a cryogenic ASU is integrated with an LNG‐direct expansion cycle‐organic Rankine cycle power cycle to supply the necessary power for operation and reduce extraneous power inputs. Overall, this integrated approach increases efficiency, lowers costs, benefits the environment, allows for flexibility and adaptability, and raises system dependability.

show abstract

Thermodynamic analysis and optimization of a two-stage organic Rankine cycle for liquefied natural gas cryogenic exergy recovery

Cited by 87 publications

References 30 publications

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Energy and Exergy Analyses of a Combined Power Cycle Using the Organic Rankine Cycle and the Cold Energy of Liquefied Natural Gas

Optimizing Air Separation and LNG Cold Utilization: Energy Savings, Exergy Efficiency, and System Reliability

Contact Info

Product

Resources

About