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首页> 外文期刊>Journal of loss prevention in the process industries >Study of dry ice formation during blowdown of CO2-CH4 from cryogenic distillation column
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Study of dry ice formation during blowdown of CO2-CH4 from cryogenic distillation column

机译：低温蒸馏塔CO2-CH4排污干冰的研究

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摘要

Cryogenic distillation columns are generally subjected to high-pressure loadings during the natural gas purification process. The high-pressure conditions inside the column cause safety risk e.g. rupture. When an emergency arises, blowdown is a typical way of minimizing the failure hazard. However, blowdown at the cryogenic conditions involves dry ice formation due to the rapid decrease in temperature driven by the Joule-Thomson effect. The dry ice formation intensifies the failure hazard due to the orifice blockage. Therefore, optimization of blowdown parameters is necessary to avoid the dry ice formation. So far, very limited studies are available in the literature for the blowdown of CO2-CH4 mixture, especially at the cryogenic conditions. In this study, a computational investigation followed by the experimental validation is accomplished to analyze the dry ice formation during blowdown of CO2-CH4 binary mixture from the cryogenic distillation column. The composition of mixture, orifice size, and initial conditions inside vessel have a high impact on blowdown path. A 3.00 mm orifice is the most suitable size for the blowdown at cryogenic conditions as it doesn't promote solidification and discharges the inventory quickly. Based on the experimental observation, an empirical correlation is also developed to instantly find out the optimum blowdown parameters.
机译：在天然气净化过程中通常对低压载量进行低压载量。列内的高压条件导致安全风险。破裂。当发生紧急情况时，排污是最小化破坏危险的典型方式。然而，低温条件下的排污涉及由于焦耳 - 汤姆森效应驱动的温度迅速降低，涉及干冰。干冰形成增强了由于孔口堵塞而造成的故障危害。因此，需要优化排污参数以避免干冰形成。到目前为止，文献中有非常有限的研究，用于CO2-CH4混合物的排污，尤其是在低温条件下。在该研究中，完成了实验验证的计算研究，以分析来自低温蒸馏塔的CO2-CH4二元混合物的排污期间的干冰形成。血管内混合物，孔口尺寸和初始条件的组成对排污路径产生高。 3.00毫米孔口是低温条件下的最合适的尺寸，因为它不会促进凝固并迅速地排出库存。基于实验观察，还开发了经验相关性以瞬间找出最佳排污参数。

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