天然气净化厂文丘里组合式急冷塔流场模拟与优化  

Flow field simulation and optimization of combined Venturi quench tower in natural gas purification plants

作　　者：邱星城 谢晓玲 廖杰 李超群 刘其松[3] 周明宇 QIU Xingcheng;XIE Xiaoling;LIAO Jie;LI Chaoqun;LIU Qisong;ZHOU Mingyu(CPECC Southwest Company,Chengdu,Sichuan,610041,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan,610599,China;Natural Gas Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,610213,China)

机构地区：[1]中国石油工程建设有限公司西南分公司,四川成都610041 [2]西南石油大学化学化工学院,四川成都610599 [3]中国石油西南油气田公司天然气研究院,四川成都610213

出　　处：《天然气与石油》2024年第3期62-68,共7页Natural Gas and Oil

基　　金：中国石油天然气股份有限公司低成本绿色地面工艺与设备关键技术研究项目“含硫天然气硫磺回收及氧化吸收尾气处理关键技术研究”(2021DJ2603)。

摘　　要：康索夫尾气处理装置应用于天然气净化厂处理高温含硫烟气时,文丘里组合式急冷塔文丘里段(以下简称文丘里段)设备内部喷淋水线上方约30 cm处出现环状腐蚀环。针对设备腐蚀问题,利用计算流体力学软件模拟文丘里段气液流体流动及传热传质过程,研究腐蚀机理并提出优化方案。设备腐蚀原因是高温含硫烟气中的酸性组分被喷淋冷却时,与水蒸汽反应产生硫酸,当气体温度降至酸露点以下时产生高浓度硫酸,致使254SMo合金钢设备内壁发生严重酸腐蚀。文丘里段内部腐蚀无法完全解决,经模拟计算,改变喷淋雾化效果及喷嘴的喷淋夹角可大幅改变气液界面位置,改善设备腐蚀情况。研究成果可为类似文丘里组合式急冷塔在设计及运维方面提供参考。When the CONSOLV tail gas treatment unit is applied to treat high-temperature sulfur-containing flue gas in a natural gas purification plant,an annular corrosion ring has been observed about 30 cm above the spray water line of Venturi section of the combined Venturi quench tower.This study addresses the issue of equipment corrosion.Using computational fluid dynamics software the fluid dynamics,heat transfer,and mass transfer processes within the Venturi is simulated and analyzed.The corrosion mechanism is investigated,and optimization solutions are proposed.The cause of the corrosion is attributed to the formation of sulfuric acid when the high-temperature sulfur-containing gas comes into contact with water vapour during the cooling process.When the gas temperature drops below the sulfuric acid dew-point,high-concentration sulfuric acid droplets form,leading to severe acid corrosion on the inner wall of the 254SMo high alloy stainless steel equipment.According to the corrosion mechanism,the internal corrosion of Venturi segment cannot be completely resolved.An improvement strategy for corrosion mitigation involves changing the spray atomization effect or the spray angle of the nozzle.The research results can provide valuable reference for the design,operation and maintenance of similar quench towers with Venturi section.

关 键 词：康索夫尾气处理装置 硫酸腐蚀 计算流体力学 流场模拟 

分 类 号：TE962[石油与天然气工程—石油机械设备]