超临界二氧化碳管道杂质对节流温降的影响

doi:10.7623/syxb201601011

石油学报 ›› 2016, Vol. 37 ›› Issue (1): 111-116.DOI: 10.7623/syxb201601011

超临界二氧化碳管道杂质对节流温降的影响

赵青^1,2, 李玉星², 李顺丽²

1. 中国石油管道科技研究中心河北廊坊 065000;
2. 中国石油大学储运与建筑工程学院山东青岛 266580

收稿日期:2015-06-05 修回日期:2015-11-02 出版日期:2016-01-25 发布日期:2016-02-02
通讯作者: 赵青,男,1985年4月生,2008年获中国石油大学(华东)油气储运工程专业学士学位,2015年获中国石油大学(华东)油气储运工程专业博士学位,现为中国石油管道科技研究中心工程师,主要从事长距离油气管道输送技术研究。Email:zhaoqing_petro@126.com
作者简介:赵青,男,1985年4月生,2008年获中国石油大学(华东)油气储运工程专业学士学位,2015年获中国石油大学(华东)油气储运工程专业博士学位,现为中国石油管道科技研究中心工程师,主要从事长距离油气管道输送技术研究。Email:zhaoqing_petro@126.com
基金资助:
国家科技支撑计划项目(2012BAC24B01)和国家自然科学基金项目(No.51374231)资助。

Influence of impurities in pipeline on the temperature drop of supercritical carbon dioxide throttling

Zhao Qing^1,2, Li Yuxing², Li Shunli²

1. PetroChina Pipeline R & D Center, Hebei Langfang 065000, China;
2. College of Pipeline and Civil Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Received:2015-06-05 Revised:2015-11-02 Online:2016-01-25 Published:2016-02-02

摘要/Abstract

摘要：

超临界二氧化碳管道输送安全是碳捕集与封存技术(Carbon Capture and Storage,即CCS)的一个重要环节。当超临界管道压力过高时,一般采用节流方式泄放管内高压,节流过程产生的温降可以根据绝热假设进行预测。根据绝热假设及能量守恒关系,通过求解临界节流过程中出口速度与音速的关系式,建立临界节流比与绝热指数关系;烟气二氧化碳中含有杂质,会影响节流过程中产生的温降,根据伯努利方程及等温焓差迭代方法计算节流温降,并依据二元交互作用系数混合规则分析超临界二氧化碳管道中杂质对节流温降的影响。研究结果表明:当二氧化碳中含有的杂质为二氧化硫时,有助于提高节流后的温度,并降低发生干冰堵塞的可能,然而当杂质为氮气时则会进一步降低节流后的温度。通过实例分析给出烟气二氧化碳节流具体操作建议:当采用多级节流时,较高的初始温度可以防止放空管出口处形成干冰。

关键词: 碳捕集与封存, 二氧化碳, 管道输送, 杂质, 节流过程

Abstract:

Transportation safety of supercritical CO₂ pipeline is a key link for carbon capture and storage technology.When the pressure of supercritical pipeline is excessively high,it is generally released using throttling method,and the throttling-inducing temperature drop can be predicted based on adiabatic assumption.According to adiabatic assumption and the law of energy conservation,the relation between critical throttling ratio and adiabatic index was established by solving the relationship between outlet velocity and sound speed during critical throttling process.The impurities in flue CO₂ made influences on temperature drop in the throttling process.The throttling-inducing temperature drop was calculated based on Bernoulli's equation and isothermal enthalpy difference iterative method.Moreover,the influences of impurities in supercritical carbon dioxide pipeline on the throttling-inducing temperature drop were analyzed according to the binary interaction parameter and mixing rule.Research results show that the presence of SO₂ as an impurity in carbon dioxide is helpful for increasing the post-throttling temperature to reduce the possibility of dry ice blocking,whereas the presence of N₂ as an impurity will further reduce the post-throttling temperature.On the basis of case analysis,the specific operation recommendations are provided for anthropogenic CO₂ throttling.The higher initial temperature can prevent dry ice formation at the outlet of vent pipe in use of multistage throttling.

Key words: carbon capture and storage, carbon dioxide, pipeline transportation, impurity, throttling process

中图分类号:

TE832

赵青, 李玉星, 李顺丽. 超临界二氧化碳管道杂质对节流温降的影响[J]. 石油学报, 2016, 37(1): 111-116.

Zhao Qing, Li Yuxing, Li Shunli. Influence of impurities in pipeline on the temperature drop of supercritical carbon dioxide throttling[J]. Acta Petrolei Sinica, 2016, 37(1): 111-116.

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超临界二氧化碳管道杂质对节流温降的影响

Influence of impurities in pipeline on the temperature drop of supercritical carbon dioxide throttling

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