Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources
Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources
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DOI：
10.1016/j.energy.2012.03.076
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发表时间：
2012-07
期刊：
影响因子：
9
通讯作者：
Y. M. Kim;C. G. Kim;D. Favrat
中科院分区：
文献类型：
--
作者：
Y. M. Kim;C. G. Kim;D. Favrat
在用于核能、聚光太阳能和燃烧等应用的具有高温热源的CO2循环中，部分冷凝跨临界CO2（T-CO2）循环或再压缩超临界CO2（S-CO2）循环被认为是有前途的循环;这是因为这些循环由于高-低压侧的压力大于低压侧的压力。然而，如果在低温范围内可以获得热量，则T-CO2朗肯循环（或完全冷却的S-CO2循环）将比T-CO2布雷顿循环（或较少冷却的S-CO2循环）甚至比部分冷凝T-CO2循环（或再压缩S-CO2循环）更有效。这是因为压缩功减少，同时通过在高温加热器之前的同流换热器的热回收实现相同的温度升高。本文提出的T-CO2朗肯循环或全冷S-CO2朗肯循环，在高温热源给定的情况下，可以最大化CO2动力循环的功率输出。此外，所提出的CO2循环结合低温热能储存提供了比其他CO2循环负荷均衡的优势，与给定的高温热源。
In CO2cycles with high-temperature heat sources that are used in applications such as nuclear power, concentrated solar power, and combustion, partial condensation transcritical CO2(T-CO2) cycles or recompression supercritical CO2(S-CO2) cycles are considered to be promising cycles; this is because these cycles cause a reduction in the large internal irreversibility in the recuperator owing to the higher specific heat of the high-pressure side than that of the low-pressure side. However, if heat is available in the low-temperature range, the T-CO2Rankine cycles (or fully-cooled S-CO2cycles) will be more effective than the T-CO2Brayton cycles (or less-cooled S-CO2cycles) and even than the partial condensation T-CO2cycles (or recompression S-CO2cycles). This is because the compression work is reduced while achieving the same temperature rise by heat recovery through the recuperator before the high-temperature heater. The proposed T-CO2Rankine cycles or fully-cooled S-CO2cycles using both the low- and high-temperature heat sources can maximize the power output of the CO2power cycle with the given high-temperature heat sources. Moreover, the proposed CO2cycles combined with the low-temperature thermal energy storage offer the advantage of load leveling over other CO2cycles, with the given high-temperature heat sources.