Thermo‐economic analysis and optimization of a combined Organic Rankine Cycle (
            <scp>ORC</scp>
            ) system with
            <scp>LNG</scp>
            cold energy and waste heat recovery of dual‐fuel marine engine

Tian, Zhen; Yue, Yingying; Gu, Bin; Gao, Wenliang; Zhang, Yuan

doi:10.1002/er.5529

Cited by 38 publications

(14 citation statements)

References 32 publications

(42 reference statements)

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“…The chemical engineering plant cost index (CEPCI), which adjusts process plant construction costs from one period to another, for 2020 is 596.2. 39 The purchased equipment cost of each component is listed in Table 3.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Multi‐objective optimization of a novel biomass‐based multigeneration system consisting of liquid natural gas open cycle and proton exchange membrane electrolyzer

et al. 2021

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In the present study, multi-objective optimization has been conducted to optimize a novel multigeneration system that is based on biomass energy, and uses the cold energy of the liquid natural gas as a heat sink. The designed system is an integration of combined gas-steam cycle, a cascade Rankine cycles, a lithium bromide-water absorption refrigeration cycle, a proton exchange membrane electrolyzer, and a liquid natural gas subsystem. The proposed system aims to produce power, cooling, natural gas, and hydrogen. Following thermodynamic and exergoeconomic analysis, two conflicting objectives, that is, total product cost rate and exergy efficiency, are selected for the optimization process. The genetic algorithm is used to optimize the system and the Pareto front plot is achieved. The obtained results for this system reveal that the final optimization point has an exergy efficiency of 39.023% and a total product cost rate of 1107$/h. This point is a trade-off between thermodynamic and thermoeconomic single-objective optimization cases. In addition, the biomass gasification-gas turbine cycle, organic Rankine cycles, and proton exchange membrane have the highest exergy destruction rates, respectively. Finally, it is shown that the liquid pressure ratio of the natural gas pump and inlet temperature of the steam turbine have the most important effects on the balance between the selected objective parameters.

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Section: Thermodynamic Analysismentioning

confidence: 99%

Multi‐objective optimization of a novel biomass‐based multigeneration system consisting of liquid natural gas open cycle and proton exchange membrane electrolyzer

et al. 2021

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“…[30][31][32] Furthermore, process optimization is conducted by connecting the simulation results of Aspen HYSYS to GA in MATLAB to minimize the SEC. Multiparameter optimization can contribute to finding optimal results because the hydrogen liquefaction process consists of many input variables and nonlinear constraints 33,34 The results are then evaluated from both thermodynamic and technoeconomic perspectives for feasibility. The novelty of this work is summarized as follows:…”

Section: Introductionmentioning

confidence: 99%

Developed hydrogen liquefaction process using liquefied natural gas cold energy: Design, energy optimization, and techno‐economic feasibility

Cho

Park

Noh

et al. 2021

Intl J of Energy Research

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This study focuses primarily on improving large-scale hydrogen liquefaction process by integrating liquefied natural gas (LNG) stream to utilize LNG cold energy. For the hydrogen liquefaction process, a large amount of energy is required for the compression and the cryogenic refrigeration system. LNG is one of the main sources for producing hydrogen, and it can be an opportunity to save energy because LNG cold energy is normally discarded into seawater during regasification. The objective of this study is to reduce the specific energy consumption and specific liquefaction cost. The proposed design which produces 300 ton/day of liquid hydrogen is compared with a base case design comprising two-stage mixed refrigerant refrigeration cycles. To minimize the specific energy consumption, multiparameter optimization is conducted by connecting simulation results to a genetic algorithm. Through the optimization, the flow rates of LNG and MR in the precooling cycle decrease by 1.08 and 21.00 kg/s, respectively. The specific energy consumption is reduced from 4.36 to 4.07 kWh/kg-LH 2 . Particularly, in the precooling cycle where the LNG stream is integrated, it decreases by more than 26.40%. Regarding the specific liquefaction cost of hydrogen liquefaction, the capital expenses are reduced by 15.16%, and annual operating expenses are diminished by 9.05%. Therefore, the total specific cost liquefaction shows a reduction of approximately 7.7%.Overall, an efficient hydrogen liquefaction process will provide a guideline for LNG-dependent countries by reducing the specific energy consumption and the specific liquefaction cost by recovering the waste cold energy.

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“…According to Tian et al, given the dual-fuel engine ship, about 860 kJ/kg of cold heat is wasted when LNG is vaporized and overheated 43 . Therefore, it is advantageous to improve and/or develop a system to maximize the usage of excessive LCE.…”

Section: Introductionmentioning

confidence: 99%

Proposing a New Route to Solve Marine Debris Pollution Issues: Low-Temperature Eco-friendly Pulverization System by Utilizing LNG Cold Energy

Lee¹,

Park²,

Kim³

et al. 2021

Preprint

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Developing an effective and efficient recycling process for marine debris (MD) is one of the most urgent issues to maintain Earth’s sustainability. However, the restricted circumstances for collecting and separating MD in the ocean limit proper MD recycling. Here, we proposed a complete eco-friendly low-temperature MD pulverizing system that utilizes excessive liquefied natural gas (LNG) cold energy (LCE) in an LNG propulsion ship to improve the efficiency and effectiveness of MD recycling. The prototype design of the low-temperature pulverization (LTP) system showed that consumable refrigerant (liquid nitrogen) up to 2831 kg per hour could be substituted. Furthermore, we estimated the additional refrigerant needed for desired MD disposal depending on the ship speed to determine the optimal energy requirement. In addition, LTP systems utilizing LCE can significantly improve the storage capacity by pulverizing bulky MD. To determine the feasibility of LTP for MD recycling, four types of plastics obtained from actual MD from a coastal area in Busan, Korea were classified and tested.

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Thermo‐economic analysis and optimization of a combined Organic Rankine Cycle ( ORC ) system with LNG cold energy and waste heat recovery of dual‐fuel marine engine

Cited by 38 publications

References 32 publications

Multi‐objective optimization of a novel biomass‐based multigeneration system consisting of liquid natural gas open cycle and proton exchange membrane electrolyzer

Multi‐objective optimization of a novel biomass‐based multigeneration system consisting of liquid natural gas open cycle and proton exchange membrane electrolyzer

Developed hydrogen liquefaction process using liquefied natural gas cold energy: Design, energy optimization, and techno‐economic feasibility

Proposing a New Route to Solve Marine Debris Pollution Issues: Low-Temperature Eco-friendly Pulverization System by Utilizing LNG Cold Energy

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