Advanced exergoeconomic evaluation of single mixed refrigerant natural gas liquefaction processes

Mehrpooya, Mehdi; Ansarinasab, Hojat

doi:10.1016/j.jngse.2015.07.019

Cited by 71 publications

(17 citation statements)

References 27 publications

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“…Accordingly, interstage coolers and the subcooling LNG exchanger (CHX‐02) suffer the highest exergy destruction among all the equipment. It has been reported in several studies 35,37–42 that interstage coolers exhibit the highest exergy destruction because of the significant difference in temperature and pressure of the compressed process stream and the cooling medium (air or water). To date, it is an open issue on how exergy destruction through interstage coolers can be reduced in an energy‐efficient, economic manner.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it does not contain the ability to gauge the potential of improvement regarding exergy destructions within concerned component. Therefore, using advanced exergy analysis, total exergy destruction of the system is split up into two following categories,avoidable exergy destruction and unavoidable exergy destruction 40

{\overset{E}{true}}_{D, k} = {\overset{E}{true}}_{D, k}^{italicAV} + {\overset{E}{true}}_{D, k}^{italicUN}

…”

Section: Resultsmentioning

confidence: 99%

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Weed colonization‐based performance improvement opportunities in dual‐mixed refrigerant natural gas liquefaction process

Qyyum

Qadeer

Khan

et al. 2020

Energy Science & Engineering

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Dual‐mixed refrigerant (DMR) process is a promising candidate for liquefying the natural gas (LNG) at onshore as well as offshore sites, thanks to its higher liquefaction capacity and flexibility in using full gas turbines. DMR involves two mixed refrigerant cycles to perform precooling and subcooling of natural gas (NG), and these refrigerant compositions need constant tweaking to match the ever‐changing NG cooling curve, as it is obtained from different gas fields. Mismatching of cooling curves often results in suboptimal operation, which ultimately leads to an increase in the overall energy consumption. Thus, this study is aimed at making DMR liquefaction operation close to optimal using the invasive‐weed paradigm. At first, the decision variables for performance improvement were determined using degrees of freedom analysis then through invasive‐weed paradigm the best set of parameters that results in minimal overall energy consumption were obtained. For the given set of conditions, it was found that after optimization, the DMR process can produce LNG using 16.2% less compression power compared to the published optimized DMR process. Taking into account the higher sensitivity of the DMR process against NG feed conditions, the IWO approach was also examined to find the multiple optimal solutions corresponding to different sets of feed conditions. The thermodynamic evaluation revealed that the mixed refrigerant involves in NG subcooling and interstage coolers have the highest level of exergy destruction. After successful performance improvement of the DMR process, it is also found that still, 62% improvement potential (based on avoidable/unavoidable exergy destruction analysis) is available in the DMR process that can be attained through either sole optimization or optimal retrofitting/revamping.

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Section: Resultsmentioning

confidence: 99%

{\overset{E}{true}}_{D, k} = {\overset{E}{true}}_{D, k}^{italicAV} + {\overset{E}{true}}_{D, k}^{italicUN}

…”

Section: Resultsmentioning

confidence: 99%

Weed colonization‐based performance improvement opportunities in dual‐mixed refrigerant natural gas liquefaction process

Qyyum

Qadeer

Khan

et al. 2020

Energy Science & Engineering

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“…Different cryogenic natural gas plants were studied by exergetic and exergoeconomic techniques. [36][37][38] The results indicated that the refrigerant type has an influential role in process efficiency. An exergy analysis was performed for an LNG-based integrated plant, 39 implying that the columns and expansion valves yielded the highest exergy losses.…”

Section: Introductionmentioning

confidence: 97%

“…Exergy analysis is employed for different processes such as liquefaction plants and power generation plants. Different cryogenic natural gas plants were studied by exergetic and exergoeconomic techniques . The results indicated that the refrigerant type has an influential role in process efficiency.…”

Section: Introductionmentioning

confidence: 99%

A novel integrated hydrogen and natural gas liquefaction process using two multistage mixed refrigerant refrigeration systems

2019

Self Cite

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Summary The development and analysis of combined hydrogen and natural gas liquefaction process are reported. Two refrigeration cycles using mixed refrigerants (MRs) are employed. The developed process is capable of generating 290 tons hydrogen and 296 tons liquid natural gas on daily basis. The first refrigeration cycle of the introduced process liquefies 3.5 kg·s−1 normal gaseous hydrogen and 3.5 kg·s−1 normal natural gas at room temperature and 21 bar to −195°C with the consumed power of 0.643 kWh/kgLH2,kgLNG. The second refrigeration cycle cools down the hydrogen and natural gas to −253°C with the consumed power of 1.662 kWh/kgLH2,kgLNG, leading to a lower total consumed power than that of the identical liquefaction processes. The use of novel and appropriately mixed refrigerants based on the configuration, and the thermal design of expanders and heat exchangers fora wide range of temperatures are the innovations of the process. Additionally, the refrigerant compositions of refrigeration cycles are novel. The energy analysis indicated that the coefficient of performance (COP) for the developed process is 0.2442, which is notably high compared with the COP of other identical processes (typically less than 0.1797). The exergy analysis revealed that the overall exergy efficiency of the liquefaction process is 62.54%. Highlight edited A novel integrated hydrogen and natural gas liquefaction process is introduced. The process can generate 290 tons hydrogen and 296 tons liquid natural gas per day. Total power consumptions of the process are 4.165 kWh/kgLH2,kgLNG. Coefficient of performance (COP) for the developed process is 0.2442, which is notably high compared with the COP of other identical processes. Overall exergy efficiency of the liquefaction process is 62.54%.

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“…Some research has been allocated to advanced exergetic analysis of gas turbine system [21][22][23], cogeneration system that combines vaporizing lique ed natural gas with the generation of electricity [24,25], combined cycle power plant [26][27][28], coal-red power plant [29,30], trigeneration system with a diesel-gas engine operating in a refrigerator plant building [31], ejector refrigeration system [32], multi-e ect evaporationabsorption heat pump desalination [33], geothermal power plant [34], and a ground-source heat pump dryer [35]. Also, some researchers have applied the advanced exergoeconomic analyses to assess the cogeneration system [36,37], externally red combined cycle power plant [38], geothermal power plant [39], combined cycle power plant [40], geothermal district heating system [41], electricity-generating facility with natural gas [42], multi-e ect evaporation-absorption heat pump desalination [33], refrigerant natural gas liquefaction processes [43,44], building heating system [45], and Gas Engine Heat Pump (GEHP) for food drying processes [46].…”

Section: Introductionmentioning

confidence: 99%

Advanced exergy and exergoeconomic analyses of Kalina cycle integrated with parabolic-trough solar collectors

Boyaghchi

Sabaghian

2016

Scientia Iranica

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This research deals with the performance and cost assessment of a Kalina cycle integrated with Parabolic-Trough Solar Collectors (PTSC) using advanced exergy and exergoeconomic based methods to identify the improvement potential and the interaction among system components. The exergy destruction rate and the total operating cost within the components are divided into endogenous/exogenous and unavoidable/avoidable parts. Results indicate that the avoidable exergy destruction cost rate (_ C AV D) of the entire system is only 29%, of which 32% is related to the components and 68% is due to the interaction between them. Also, the endogenous part of the exergy destruction cost for the entire system is notably high (87%) and the contribution of _ C AV D in the entire system is 32%, of which 68% is related to the endogenous part. Furthermore, 84% of the investment cost rate is associated with endogenous cost rate (_ Z EN) and 84% of the avoidable investment cost rate (_ Z AV D) is endogenous. It is revealed that the auxiliary heater and PTSC have the highest modi ed improvement potential with values of 66.9% and 59.5%, respectively.

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Advanced exergoeconomic evaluation of single mixed refrigerant natural gas liquefaction processes

Cited by 71 publications

References 27 publications

Weed colonization‐based performance improvement opportunities in dual‐mixed refrigerant natural gas liquefaction process

Weed colonization‐based performance improvement opportunities in dual‐mixed refrigerant natural gas liquefaction process

A novel integrated hydrogen and natural gas liquefaction process using two multistage mixed refrigerant refrigeration systems

Advanced exergy and exergoeconomic analyses of Kalina cycle integrated with parabolic-trough solar collectors

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