A Kalina Cycle Application for Power Generation

Ibrahim, Mounir B.; Kovach, Ronald M.

doi:10.1115/91-gt-199

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…The defining feature of the Kalina cycle, the temperature glide during phase change, is primarily beneficial when utilising a sensible heat source such as waste heat [7,18,19] or in this case, molten salt. However, when not utilising a sensible heat source the temperature glide is only beneficial in the condensers.…”

Section: Discussionmentioning

confidence: 99%

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Energy and Exergy Analysis of the Kalina Cycle for Use in Concentrated Solar Power Plants with Direct Steam Generation

et al. 2014

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In concentrated solar power plants using direct steam generation, the usage of a thermal storage unit based only on sensible heat may lead to large exergetic losses during charging and discharging, due to a poor matching of the temperature profiles. By the use of the Kalina cycle, in which evaporation and condensation takes place over a temperature range, the efficiency of the heat exchange processes can be improved, possibly resulting also in improved overall performance of the system. This paper is aimed at evaluating the prospect of using the Kalina cycle for concentrated solar power plants with direct steam generation. The following two scenarios were addressed using energy and exergy analysis: generating power using heat from only the receiver and using only stored heat. For each of these scenarios comparisons were made for mixture concentrations ranging from 0.1 mole fraction of ammonia to 0.9, and compared to the conventional Rankine cycle. This comparison was then also carried out for various turbine inlet pressures (100 bar to critical pressures). The results suggest that there would be no benefit from using a Kalina cycle instead of a Rankine cycle when generating power from heat taken directly from the solar receiver. Compared to a baseline Rankine cycle, the efficiency of the Kalina cycle was about around 5% lower for this scenario. When using heat from the storage unit, however, the Kalina cycle achieved efficiencies up to 20% higher than what was achieved using the Rankine cycle. Overall, when based on an average assumed 18 hours cycle, consisting of 12 hours using heat from the receiver and 6 hours using heat from the storage, the Kalina cycle and Rankine cycle achieved almost equal efficiencies. A Kalina cycle operating with an ammonia mole fraction of about 0.7 returned an averaged efficiency of about 30.7% compared to 30.3% for the Rankine cycle.

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Section: Discussionmentioning

confidence: 99%

“…The vapour fraction after the vaporiser (15) is determined by the pinch point. Stream (15) then enters the separator which separates the stream into an ammonia rich vapour (19) and a lean liquid (16). Heat from stream (16) is used to preheat stream (11).…”

Section: System Descriptionmentioning

confidence: 99%

Energy and Exergy Analysis of the Kalina Cycle for Use in Concentrated Solar Power Plants with Direct Steam Generation

et al. 2014

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“…The mixture (7) is cooled in the condenser to convert into saturated basic liquid solution (8). After that it is compressed by the pump to the high pressure P e (9). Then the compressed liquid solution is preheated by the recuperator (10) and finally enters into the solar evaporator to repeat the cycle.…”

Section: Schematic Description Of Cpc-kcs Hybrid Systemmentioning

confidence: 99%

“…As the subcycle integrated with solar collectors to generate electricity, organic rankine cycle (ORC) and Kalina cycle system (KCS) are considered as the most appropriate options. Compared with ORC, KCS can increase both thermodynamic reversibility and thermal efficiency, because the working fluid of Kalina, i.e., ammonia–water, has the advantage of variable‐temperature evaporation and condensation by varying its composition throughout the cycle .…”

Section: Introductionmentioning

confidence: 99%

Preliminary analysis on thermodynamic and thermo‐economic performance of a solar CPC–KCS hybrid system

Xiao

Fan

et al. 2018

Env Prog and Sustain Energy

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Using solar collectors to actuate Kalina cycle system (KCS) for electricity generation has been an attractive way to take advantage of solar energy. Most of the existing research is about KCS integrated with flat plate collector, evacuated tube collector, or concentrating collectors; however, little research focuses on the KCS powered by compound parabolic concentrator (CPC). Considering the merits of CPC, a Kalina 11 cycle system which is directly powered by CPC, named as solar CPC–KCS hybrid system is studied as the research object. Energy, exergy and thermo‐economic models are established to estimate the system performance by varying the solar radiation, evaporating temperature and concentration of working fluid. Results show that higher evaporating temperature improves thermal and exergy efficiency. There are optimal values of Te for maximum wnet, that is, Te,opt = 422.15, 434.15, and 446.15 K, respectively, at Xr = 0.95, 0.93, and 0.91; while Te,opt = 443.15, 437.15, and 425.15 K at Xb = 0.8, 0.7, and 0.6. Higher Xr and lower Xb is generally favorable for system performance. But when Te ≥ 422.15 K, lower Xb is not beneficial to ηex improvement anymore. Additionally, once evaporating temperature exceeds 439.15 K, it is cost‐effective to install a superheater to avoid erosion potential risk. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13135, 2019

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“…performance to reduce the electricity cost. Kalina use an ammonia-water mixture as the working fluid in their cycle, which have been developed and reported to have better performance than the Rankine cycle at same temperature difference [5]. Thus, Kalina cycle is considered as one promising way to be used in OTEC.…”

Section: Introductionmentioning

confidence: 99%

Energy-Economic Analysis and Configuration Design of the Kalina Solar-OTEC System

Sun¹,

Zhou²,

Nakagami³

et al. 2013

IJCEE

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Based on one of the typical low-grade thermal power cycles, Kalina cycle, the solar auxiliary boosted ocean thermal energy conversion (Kalina Solar-OTEC) system is proposed in the paper. To utilize solar energy in the Solar-OTEC system with high performance and low cost, three kinds of configurations by acting same solar heat transfer rate on different part of the Solar-OTEC system are designed and discussed here. Meanwhile, the corresponding calculation model is built to compare their performance. Results show that Kalina Solar-OTEC in case 1 has better thermodynamics and economic performance than other cases

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A Kalina Cycle Application for Power Generation

Cited by 8 publications

References 8 publications

Energy and Exergy Analysis of the Kalina Cycle for Use in Concentrated Solar Power Plants with Direct Steam Generation

Energy and Exergy Analysis of the Kalina Cycle for Use in Concentrated Solar Power Plants with Direct Steam Generation

Preliminary analysis on thermodynamic and thermo‐economic performance of a solar CPC–KCS hybrid system

Energy-Economic Analysis and Configuration Design of the Kalina Solar-OTEC System

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