Experimental Study of the Effect by Double-Stage Throttling on the Pressure Relief Characteristics of a Large-Scale CO 2 Transportation Pipeline

Huifang Song, Tingyi Wang, Jingjing Qi, Kai Jin, Jia Liu, Feng Li, Fanfan Qiao, Kun Zhao, Baoying Yin and Jianliang Yu ()
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Huifang Song: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Tingyi Wang: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Jingjing Qi: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Kai Jin: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Jia Liu: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Feng Li: Shengli Oilfield Technology Inspection Center, Dongying 257000, China
Fanfan Qiao: School of Chemical Engineering, Dalian University of Technology, Dalian 116000, China
Kun Zhao: School of Chemical Engineering, Dalian University of Technology, Dalian 116000, China
Baoying Yin: School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Jianliang Yu: School of Chemical Engineering, Dalian University of Technology, Dalian 116000, China

Energies, 2025, vol. 18, issue 13, 1-21

Abstract: The safety of pipeline transportation technology is the key to guaranteeing the development and application of CCUS. In the process of CO 2 pipeline transportation, manual pressure relief may be required due to equipment failure, overpressure, or other reasons. However, the sharp temperature drop in the evacuation process may lead to the formation of dry ice, which may cause a pipeline blockage and equipment damage. Although the multi-stage throttling method of pressure relief can effectively control the stability of the equipment, the effect on the low temperature of the pipeline needs to be further investigated. Therefore, in order to evaluate the safety of multi-stage throttling pressure relief, a comparative experiment of dense-phase venting with double-stage throttling was carried out based on an industrial-scale pipeline experimental device. The results show that the double-stage throttling pressure relief scheme can significantly reduce the pressure drop rate and improve the stability of the pressure relief structure. Moreover, the temperature drop limit upstream of the main pipeline is controlled under the double-stage throttling scheme, but it exacerbates the low temperature level downstream, which is not conducive to mitigating the risk of freeze-plugging of the pressure relief valve. Therefore, it is recommended that the double-stage throttling relief scheme be used to close the valve in time to return to the temperature and to adopt an intermittent means of pressure relief.

Keywords: CCUS; artificial pressure relief; throttling and venting; dry ice risk; pipeline safety (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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