A Calculation Method for Physical Properties of Carbon Dioxide in a Wide Parameter Range

Abstract

The invention discloses a carbon dioxide physical property solving method with a wide parameter range. The method comprises; a real gas state equation is adopted in the region of a carbon dioxide critical point for iterative solution; carrying out physical property direct solution in an area far away from the carbon dioxide critical point by adopting a fitting relation; and carrying out interpolation solution in the boundary region by adopting a fitting relation and a real gas state equation, and calculating to obtain saturated liquid enthalpy values, saturated gas enthalpy values, temperature, specific volume, heat conductivity and dynamic viscosity physical property parameters. According to the method, the calculation precision of carbon dioxide is ensured, and the solving speed of a reactor numerical calculation program is increased.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor safety analysis and calculation, and in particular relates to a method for solving physical properties of carbon dioxide in a wide parameter range. Background technique [0002] The supercritical carbon dioxide Brayton cycle has the advantages of high thermal efficiency, simplified and compact system, and is a very promising fourth-generation nuclear reactor energy conversion system. When the supercritical carbon dioxide Brayton cycle is running in a steady state, the supercritical carbon dioxide at the compressor inlet is near the critical point, and the carbon dioxide will undergo drastic and rapid physical property changes. Key physical parameters such as specific volume, specific heat, and thermal conductivity of carbon dioxide are all Distortion will occur. In addition, in a transient or accident, the operating state point of the supercritical carbon dioxide Brayton cycle will experi...

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Problems solved by technology

However, the physical property distortion of carbon dioxide near the critical point leads to insufficient calculation accuracy of the fitting relation

[0005] Due to the physical properties of carbon dioxide, the existing transient and accident numerical analysis programs for Brayton cycles of supercritical carbon dioxide reactors do not meet the requirements in terms of calculation accuracy or calculation speed

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