| 刘培启,李想,冯明宇,于洋,胡大鹏.含相变压力振荡改进算法及其验证[J].,2021,61(1):22-29 |
| 含相变压力振荡改进算法及其验证 |
| Improved calculation method for pressure oscillation with phase change and its verification |
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| DOI：10.7511/dllgxb202101004 |
| 中文关键词:压力振荡管气波制冷CPA气体状态方程数值模拟实验验证 |
| 英文关键词:pressure oscillation tubegas wave refrigerationCPA gas equation of statenumerical simulationexperimental validation |
| 基金项目:国家重点研发计划资助项目(2018YFA0704601)；国家自然科学基金资助项目(21676048). |
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| 中文摘要: |
| 压力振荡制冷技术广泛应用在天然气等含湿气体冷凝分离系统中．当含湿气体含有水蒸气等极性物质时，热力学计算需要考虑介质真实气体效应．利用CPA气体状态方程对湿空气凝结蒸发模型进行改进，并搭建了实验平台进行验证．结果表明：经CPA气体状态方程改进后的数值模型相较于理想气体模型可以更为准确地描述水蒸气的凝结和蒸发行为，为含湿天然气制冷提供了理论基础．随着高压入口饱和湿空气压力从0.2 MPa升至0.4 MPa，两种模型计算得到的制冷效率差距逐渐增大；与实验数据相比，改进后的数值模型的计算结果相较于理想气体模型更为准确，变化趋势也更为符合．在此基础上，利用改进后的数值模型对水蒸气在压力振荡制冷过程中的液化率进行计算，为含湿天然气制冷后的气液分离过程提供了设计依据． |
| 英文摘要: |
| Pressure oscillation refrigeration technology is widely used in the condensation separation system of wet gas such as natural gas. When the wet gas contains polar substances such as water vapor, the real gas effect should be considered in the thermodynamic calculation. CPA gas equation of state is used to improve the condensation evaporation model of wet air, and an experimental platform is built to verify it. The results show that the improved model can describe the condensation and evaporation behavior of water vapor more accurately than the ideal gas model, which provides a theoretical basis for wet natural gas refrigeration. With the pressure of the saturated wet air at the high pressure inlet rising from 0.2 MPa to 0.4 MPa, the refrigeration efficiency difference calculated by both models increases. Compared with the experimental data, the calculation results of the improved numerical model are more accurate and the change trend is more consistent than ideal gas model. On this basis, the liquefaction rate of water vapor during pressure oscillation refrigeration is calculated using improved numerical model, which provides the design basis for the gas liquid separation process after the refrigeration of wet natural gas. |
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