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Equations for calculating the properties of dissociated steam

机译：计算离解蒸汽性质的方程式

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The equations of state for dissociated steam have been developed in the temperature and pressure ranges of 1250-2300 K and 0.01-10.00 MPa for calculating thermodynamic processes in thermal power units operating on high-temperature steam. These equations are based on the property tables for dissociated steam derived at a reference temperature of 0 K. It is assumed that the initial substance is steam, the dissociation of which—in accordance with the most likely chemical reactions—results in formation of molecules of hydrogen, oxygen, steam, hydroxyl, and atoms of oxygen and hydrogen. Differential thermodynamic correlations, considering a change in the chemical potential and the composition of the mixture, during the steam dissociation are used. A reference temperature of 0.01°С used in the calculation of parameters of nondissociated steam has been adopted to predict processes in thermal power units without matching the reference temperatures and to account for transformation of dissociated steam into its usual form for which there is the international system of equations with the water triple point of 0.01°С taken as the reference. In the investigated region, the deviation of dissociated steam properties from those of nondissociated steam, which increases with decreasing the pressure or increasing the temperature, was determined. For a pressure of 0.02 MPa and a temperature of 2200 K, these deviations are 512 kJ/kg for the enthalpy, 0.2574 kJ/(kg K) for the entropy, and 3.431 kJ/(kg K) for the heat capacity at constant pressure. The maximum deviation of the dissociated steam properties calculated by the developed equations from the handbook values that these equations are based on does not exceed 0.03-0.05%.
机译：在1250-2300 K和0.01-10.00 MPa的温度和压力范围内，已经建立了离解蒸汽的状态方程，用于计算在高温蒸汽下运行的热力机组的热力学过程。这些方程式基于在0 K参考温度下导出的离解蒸汽的特性表。假定初始物质为蒸汽，根据最可能的化学反应，其分解会导致形成分子氢，氧，蒸汽，羟基以及氧和氢原子。考虑蒸汽分解过程中考虑到化学势和混合物组成的变化的热力学差异。在计算非离解蒸汽参数时使用的参考温度为0.01°С，已被用于预测火力发电装置中的过程而未与参考温度匹配，并考虑了将离解蒸汽转换成国际系统通常使用的形式以水的三重点为0.01°С的方程组为参考。在研究区域中，确定了离解蒸汽性能与非离解蒸汽性能之间的偏差，该偏差随压力降低或温度升高而增加。对于0.02 MPa的压力和2200 K的温度，对于焓，这些偏差是512 kJ / kg，对于熵，这些偏差是0.2574 kJ /（kg K），对于在恒定压力下的热容，这些偏差是3.431 kJ /（kg K） 。由已开发的方程式计算得出的离解蒸汽性质与这些方程式所基于的手册值的最大偏差不超过0.03-0.05％。

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