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    Simulation of a Supercritical CO2 Recompression Cycle with Zero Emissions

    Source: Journal of Energy Engineering:;2020:;Volume ( 146 ):;issue: 006
    Author:
    Xuelei Zhang
    ,
    Liang Yu
    ,
    Ming Li
    ,
    Piaopiao Song
    DOI: 10.1061/(ASCE)EY.1943-7897.0000711
    Publisher: ASCE
    Abstract: The NET power cycle (NPC) offers an alternative way to inherently capture combustion derived CO2 with low efficiency penalty. This manuscript improves the NPC by recompressing a portion of the recycled CO2 stream to the exit of low temperate regenerator, forming a recompression NET power cycle (RNPC). The RNPC further enhances cycle recuperation and no longer needs to input extra heat to cover the heat gap between low pressure and high pressure CO2 streams in the regenerator. The model of internal convection cooling for the turbine in sCO2 cycle is also accomplished according to the semiempirical formula, aiming to investigate the effect of coolant flow. This manuscript respectively conducts the system multiparameter optimization for uncertain boundary parameters and the sensitivity analysis for definite boundary parameters. The simulation results show that RNPC can output 27.2  MWe more NEP than NPC without extra heat input, leading to 3.54% of the increase in net electric efficiency. RNPC’s efficiency increases monotonically with not only turbine inlet temperature but inlet pressure, which indicates that RNPC has the potentiality to further improve its efficiency at higher turbine inlet temperature and inlet pressure. However, turbine outlet pressure has a nonmonotonic effect on the cycle performance, and the optimal turbine outlet pressure corresponding to the maximum cycle efficiency is about 38–42 bar. The multiparameter optimization indicates that the global optimal cycle efficiency is approximately 53.55% within the ranges of investigated parameters. The RNPC’s efficiency is considerably influenced by the minimum cycle temperature (0.234%/°C), compressor efficiency (0.08%/%), turbine efficiency (0.355%/%), and regenerator temperature differences (0.083%/°C for HTR and 0.080%/°C for LTR).
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      Simulation of a Supercritical CO2 Recompression Cycle with Zero Emissions

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    contributor authorXuelei Zhang
    contributor authorLiang Yu
    contributor authorMing Li
    contributor authorPiaopiao Song
    date accessioned2022-01-30T21:41:11Z
    date available2022-01-30T21:41:11Z
    date issued12/1/2020 12:00:00 AM
    identifier other%28ASCE%29EY.1943-7897.0000711.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4268663
    description abstractThe NET power cycle (NPC) offers an alternative way to inherently capture combustion derived CO2 with low efficiency penalty. This manuscript improves the NPC by recompressing a portion of the recycled CO2 stream to the exit of low temperate regenerator, forming a recompression NET power cycle (RNPC). The RNPC further enhances cycle recuperation and no longer needs to input extra heat to cover the heat gap between low pressure and high pressure CO2 streams in the regenerator. The model of internal convection cooling for the turbine in sCO2 cycle is also accomplished according to the semiempirical formula, aiming to investigate the effect of coolant flow. This manuscript respectively conducts the system multiparameter optimization for uncertain boundary parameters and the sensitivity analysis for definite boundary parameters. The simulation results show that RNPC can output 27.2  MWe more NEP than NPC without extra heat input, leading to 3.54% of the increase in net electric efficiency. RNPC’s efficiency increases monotonically with not only turbine inlet temperature but inlet pressure, which indicates that RNPC has the potentiality to further improve its efficiency at higher turbine inlet temperature and inlet pressure. However, turbine outlet pressure has a nonmonotonic effect on the cycle performance, and the optimal turbine outlet pressure corresponding to the maximum cycle efficiency is about 38–42 bar. The multiparameter optimization indicates that the global optimal cycle efficiency is approximately 53.55% within the ranges of investigated parameters. The RNPC’s efficiency is considerably influenced by the minimum cycle temperature (0.234%/°C), compressor efficiency (0.08%/%), turbine efficiency (0.355%/%), and regenerator temperature differences (0.083%/°C for HTR and 0.080%/°C for LTR).
    publisherASCE
    titleSimulation of a Supercritical CO2 Recompression Cycle with Zero Emissions
    typeJournal Paper
    journal volume146
    journal issue6
    journal titleJournal of Energy Engineering
    identifier doi10.1061/(ASCE)EY.1943-7897.0000711
    page18
    treeJournal of Energy Engineering:;2020:;Volume ( 146 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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