Abstract

The article addresses the thermodynamic issues of supercritical CO₂ power cycles at combustion of methane with oxygen. By the example of cycle with single-stage pump pressure rise with condensation of the working fluid, we consider the issue of ensuring the temperature of the working fluid supplied to the combustion chamber and the value of the theoretical specific heat flux into the regenerative system of cycle for a wide range of initial parameters at the turbine inlet. It has been shown that, depending on the pressure, the heat flux into the regenerative system is 700–1000 kJ/kgCO₂ when an initial temperature of 1000°C is provided, and its fraction in the total heat transfer to the working fluid is 0.5–0.6 in the zone of operational initial parameters. It has been determined that for the cycle efficiency to be high, the temperature of the working fluid supplied to the combustion chamber in the regenerative heat exchanger should be at least \(\sim 2/3\) of the temperature at its outlet.

中文翻译：

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甲烷富氧燃烧CO2动力循环燃烧室工质供给温度研究

摘要

本文讨论了 甲烷与氧气燃烧时超临界CO _{2动力循环的热力学问题。}以单级泵压升随工质冷凝循环为例，考虑保证供给燃烧室的工质温度和进入再生系统的理论比热通量值的问题。在涡轮机入口处进行各种初始参数的循环。研究表明， 当初始温度为 1000°C 时，根据压力的不同，进入再生系统的热通量为 700–1000 kJ/kgCO ₂ ，​​其在传递到工作流体的总热量中的比例为操作初始参数范围内为 0.5–0.6。已经确定，为了获得较高的循环效率，供应到再生热交换器中的燃烧室的工作流体的温度应至少为其  出口温度的\(\sim 2/3\) 。