Comparison of different CO2 liquefaction processes and exergoeconomic evaluation of integrated CO2 liquefaction and absorption refrigeration system

Aliyon, Kasra; Mehrpooya, Mehdi; Hajinezhad, Ahmad

doi:10.1016/j.enconman.2020.112752

Cited by 37 publications

(25 citation statements)

References 51 publications

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“…Also, the exergy destruction rate ( Ė D ), exergy destruction ratio ( y k ), and exergy efficiency (ε) are required to conduct the exergoeconomic analysis. Other exergoeconomic parameters are defined as follows where c P,k and c F,k are the average cost over the product and fuel exergy unit, respectively. The exergy destruction cost rate, which is highly crucial for the decision making of system operation, can signify the important hidden cost of exergy destruction.…”

Section: Theory and Backgroundmentioning

confidence: 99%

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Exergy and Exergoeconomic Assessment of an Acid Gas Removal Unit in a Gas Refinery Plant

Mohamadi‐Baghmolaei

Hajizadeh

Zendehboudi

et al. 2021

Ind. Eng. Chem. Res.

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Acid gas absorption using amine solution is a common method for large-scale acid gas separation, although this separation technique suffers from high energy requirements. In this study, the amine-based acid gas removal (AGR) unit aims for operation enhancement. The new amine mixture, a combination of MDEA-DEA-PZ, is used to remove acid gas components from natural gas. As energy consumption is of high importance for both the industry and community, a systematic exergoeconomic optimization and a sensitivity analysis are performed to avoid production loss and enhance the AGR unit's energy efficiency. An exergy assessment is performed to determine the irreversibility and exergy efficiency of the AGR equipment. The stripper and absorber columns show the largest exergy destruction, that is 8.48 and 7.93 MW, respectively; almost 80% of the entire exergy destruction belongs to the stripper and absorber. The exergoeconomic parameters, such as relative cost difference, exergoeconomic factor, and most importantly, the exergy destruction cost, are determined for the key equipment of the AGR unit. The stripper accounts for the largest exergy destruction cost (0.5260 $/s), followed by the absorber (0.2950 $/s). The Taguchi approach is employed to conduct a proper sensitivity analysis and to determine the optimal operation state with the lowest total exergy destruction cost. Five key parameters, including stripper pressure, lean amine loading, lean amine temperature, lean amine concentration, and PZ concentration, are selected for the optimization phase. It is concluded that the stripper pressure and lean amine loading (with 28 and 25% relative significance, respectively) are the key factors with the largest shares in the total exergy destruction value. The optimal operation state obtained by the Taguchi method shows a remarkable reduction in the exergy destruction cost (19.32%) and steam consumption (23.88%). According to the environmental assessment, CO 2 emissions mitigate from 118.88 to 90.49 t/d while operating the process at the optimal conditions. In addition, the carbon tax is reduced to almost 23% at the optimal condition, and the steam cost declines from 3.77 × 10 6 to 2.87 × 10 6 USD/year. This study further highlights the importance of exergoeconomic assessment as a useful strategy for determining the irreversibility costs in energy and chemical sectors.

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Section: Theory and Backgroundmentioning

confidence: 99%

Section: Cost Balancementioning

confidence: 99%

Exergy and Exergoeconomic Assessment of an Acid Gas Removal Unit in a Gas Refinery Plant

Mohamadi‐Baghmolaei

Hajizadeh

Zendehboudi

et al. 2021

Ind. Eng. Chem. Res.

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“…The thermodynamic conditions of the streams in the integrated structure of liquid carbon dioxide, electricity, and medium pressure steam production using a molten carbonate fuel cell, a Linde-Hampson liquefaction plant, and a HSRG, are presented in Table 1. The validation of the several parameters of the Linde-Hampson liquefaction cycle in this paper with reference [18] is illustrated in Figure 3. The results of the simulation analysis with the HYSYS software show that the fuel cell performance coefficient, total cooling duty, and refrigeration energy differ from the evaluated values reported in the reference article by 2.07%, 0.604%, and 2.022%, respectively.…”

Section: Energy Analysismentioning

confidence: 99%

“…Therefore, liquid CO 2 can be used as a working fluid in energy storage structures [16,17]. Aliyon et al [18] investigated CO 2 liquefaction units by several methods, such as the utilization of the vapor compression refrigeration cycle, the water-ammonia absorption refrigeration unit, and the Linde-Hampson refrigeration cycles. The simulation results revealed that the performance coefficient was the lowest (0.537) for the water-ammonia absorption refrigeration unit and was the highest (2.617) for the compression refrigeration cycle.…”

Section: Introductionmentioning

confidence: 99%

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Development of an Integrated Structure for the Tri-Generation of Power, Liquid Carbon Dioxide, and Medium Pressure Steam Using a Molten Carbonate Fuel Cell, a Dual Pressure Linde-Hampson Liquefaction Plant, and a Heat Recovery Steam Generator

Ghorbani

2021

Sustainability

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Due to the increase in energy consumption and energy prices, the reduction in fossil fuel resources, and increasing concerns about global warming and environmental issues, it is necessary to develop more efficient energy conversion systems with low environmental impacts. Utilizing fuel cells in the combined process is a method of refrigeration and electricity simultaneous production with a high efficiency and low pollution. In this study, a combined process for the tri-generation of electricity, medium pressure steam, and liquid carbon dioxide by utilizing a molten carbonate fuel cell, a dual pressure Linde-Hampson liquefaction plant and a heat recovery steam generator is developed. This combined process produces 65.53 MW of electricity, 27.8 kg/s of medium pressure steam, and 142.9 kg/s of liquid carbon dioxide. One of the methods of long-term energy storage involves the use of a carbon dioxide liquefaction system. Some of the generated electricity is used in industrial and residential areas and the rest is used for storage as liquid carbon dioxide. Liquid carbon dioxide can be used for peak shavings in buildings. The waste heat from the Linde-Hampson liquefaction plant is used to produce the fuel cell inlet steam. Moreover, the exhaust heat of the fuel cell and gas turbine would be used to produce the medium pressure steam. The total efficiency of this combined process and the coefficient of performance of the refrigeration plant are 82.21% and 1.866, respectively. The exergy analysis of this combined process reveals that the exergy efficiency and the total exergy destruction are 73.18% and 102.7 MW, respectively. The highest rate of exergy destruction in the hybrid process equipment belongs to the fuel cell (37.72%), the HX6 heat exchanger (8.036%), and the HX7 heat exchanger (6.578%). The results of the sensitivity analysis show that an increase in the exit pressure of the V1 valve by 13.33% would result in an increase in the refrigeration energy by 2.151% and a reduction in the refrigeration cycle performance by 9.654%. Moreover, by increasing the inlet fuel to the fuel cell, the thermal efficiency of the whole combined process rises by 18.09%, and the whole exergy efficiency declines by 12.95%.

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Performance Analysis and Optimization of a Novel Combined Cooling, Heating, and Power System‐Integrated Rankine Cycle and Brayton Cycle Utilizing the Liquified Natural Gas Cold Energy

et al. 2022

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In recent years, the efficient utilization of energy has become a hot issue in scientific research. Society needs sustainable development. Fossil energy will gradually withdraw from the stage of energy utilization in the future, and the significance of clean energy becomes increasingly prominent. Natural gas (NG) stands out for its superior characteristics among many clean energy sources. It is generally accepted as the cleanest fossil energy source in the world, [1] which has advantages of high calorific value and economic and environmental protection. NG emits very little greenhouse gas during the combustion process, and its application can greatly reduce the global greenhouse effect. NG is liquid state when stored and when in short distance transported, liquefied natural gas (LNG) is colorless, nontoxic, odorless and noncorrosive, and is 600 times the volume of NG. [2,3] The temperature is À162 °C at 101.325 kPa, LNG will be gasified to more than 25 °C before being transported to the gas user terminal, and the huge cold energy will be released simultaneously. Utilizing this part of energy rationally will produce excellent benefits.At present, LNG cold energy is mainly used as a cold source and applied to the combined power generation, refrigeration, and heating cycle engineering fields with thermal energy (industrial waste heat, solar energy, geothermal energy, etc.) together. In the past decade, there have been extensive in-depth researches conducted in this direction by many scholars. Lee et al. [4] designed and

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Comparison of different CO2 liquefaction processes and exergoeconomic evaluation of integrated CO2 liquefaction and absorption refrigeration system

Cited by 37 publications

References 51 publications

Exergy and Exergoeconomic Assessment of an Acid Gas Removal Unit in a Gas Refinery Plant

Exergy and Exergoeconomic Assessment of an Acid Gas Removal Unit in a Gas Refinery Plant

Development of an Integrated Structure for the Tri-Generation of Power, Liquid Carbon Dioxide, and Medium Pressure Steam Using a Molten Carbonate Fuel Cell, a Dual Pressure Linde-Hampson Liquefaction Plant, and a Heat Recovery Steam Generator

Performance Analysis and Optimization of a Novel Combined Cooling, Heating, and Power System‐Integrated Rankine Cycle and Brayton Cycle Utilizing the Liquified Natural Gas Cold Energy

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