Investigation and comparison of calculation methods for flow rate of S-CO<sub>2</sub> power cycle safety valve exhaust

XIONG Bochun

doi:10.19666/j.rlfd.202111242

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Investigation and comparison of calculation methods for flow rate of S-CO₂ power cycle safety valve exhaust

更新时间：2025-09-28

- Investigation and comparison of calculation methods for flow rate of S-CO₂ power cycle safety valve exhaust
- Thermal Power Generation Vol. 51, Issue 6, Pages: 68-73(2022)
- 作者机构：
  
  东方电气集团东方锅炉股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202111242
  CLC： TM611.3
- Published：2022
- 稿件说明：
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XIONG Bochun. Investigation and comparison of calculation methods for flow rate of S-CO₂ power cycle safety valve exhaust[J]. Thermal power generation, 2022, 51(6): 68-73.
DOI：

XIONG Bochun. Investigation and comparison of calculation methods for flow rate of S-CO₂ power cycle safety valve exhaust[J]. Thermal power generation, 2022, 51(6): 68-73. DOI： 10.19666/j.rlfd.202111242.

摘要

针对安全阀排气出口流速计算方法在超临界二氧化碳（S-CO_2）领域的适用性问题，给出了安全阀排气计算的热力学模型，在考虑实际气体影响的前提下，分析了DL/T 5054和ASME B 31.1中2种计算方法的推导过程和前提假设，重点比较了2种方法在过热蒸气安全阀排气出口流速计算中的特点，半定量地分析了一些重要因素对计算结果的影响，并对第2种计算方法的参数取值进行了修改。计算结果表明：将第1种方法及修改后的第2种方法应用于S-CO_2安全阀排气管的计算时，前者偏差较大，后者则较为精确；采用第2种方法计算S-CO_2安全阀排气流速时，所必需的参数值k=1.2

a=115 kJ/kg

b=6。

Abstract

In view of the applicability of calculation method of safety valve exhaust flow rate in the field of supercritical carbon dioxide(S-CO_2)

the thermodynamic model of safety valve exhaust flow rate calculation is given. On the premise of considering the influence of actual gas

the derivation process and premise assumptions of two calculation methods in DL/T 5054 and ASME B 31.1 are analyzed

and the characteristics of the two methods in the calculation of flow rate of superheated steam safety valve exhaust are compared. The influence of some important factors on the calculation results is semi quantitatively analyzed

and the parameter value of the second calculation method is modified. The calculation results show that

when the first method and the second method(after modification) are applied to the calculation of the exhaust pipe of S-CO_2 safety valve

the former has a large deviation and the latter is more accurate. The modified second method is recommended for S-CO_2 with the new parameters: k=1.2

a=115 kJ/kg

b=6.

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Related Author

LI Jun1

YAN Wei-ping1

GAO Bao-tong2

WANG Qiong1 1.Key Laboratory of Condition Monitoring and Control for power plant Equipment under Educational Ministry

MA Chuan-gang1

SHAO Tian-yon2

CAI Hui31.Department of Maintenance Affairs under Thermal Power Yuhuan Power Plant

SHI Xin1

Related Institution

College of Energy and Power Engineering, North China Electric Power University

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Investigation and comparison of calculation methods for flow rate of S-CO2 power cycle safety valve exhaust

DOI：10.19666/j.rlfd.202111242

摘要

Abstract

关键词

Keywords

references

Investigation and comparison of calculation methods for flow rate of S-CO₂ power cycle safety valve exhaust