工艺参数对MDEA脱硫装置安全平稳运行的影响分析
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摘要
川渝气田某高含硫天然气净化厂采用MDEA脱硫工艺,装置在日常生产运行过程中出现了较为严重的腐蚀及拦液发泡问题,多次停车。为明确原因,结合装置检修期间发现的具体问题,对运行期间的溶液质量、酸气负荷、溶液循环量、流速、温度等关键参数进行了分析。结果表明:①部分管线局部流速超过30 m/s;②酸气负荷长期超过设计值0.6 mol/mol;③重沸器及再生塔底部温度超过127℃;④MDEA溶液中产生大量热稳定盐及颗粒物。在此基础上,进一步阐述了不同工艺参数间存在的相互关系及其对装置平稳运行的影响。建议在今后的生产运行过程中,加强脱硫装置工艺参数的综合管理,确保实际运行符合设计要求。
MDEA desulfurization process was adopted in a high sulfur natural gas purification plant in Sichuan and Chongqing gas field. Serious corrosion and liquid blocking foaming problems occurred in the daily production and operation of the plant, which eventually led to the shutdown of the unit. In order to clarify the reason, the key parameters such as solution quality, acid gas load, circulation rate of the solution, flow rate and temperature during operation were analyzed in combination with the specific problems found during overhaul of the plant. The results showed as follows:(1) the local velocity of some pipelines exceeded 30 m/s;(2) the acid gas load exceeded the design value 0.6 mol/mol for a long time;(3) the bottom temperature of reboiler and regeneration tower exceeded 127 ℃;(4) a large amount of thermal stable salts and particles were generated in MDEA solution. On this basis, the interrelation between different process parameters and influence on the stable running of the device were further expounded. In the future production and operation process, it was suggested that the comprehensive management of process parameters of desulfurization unit should be strengthened to ensure the actual operation meeting the design requirements.
MDEA desulfurization process was adopted in a high sulfur natural gas purification plant in Sichuan and Chongqing gas field. Serious corrosion and liquid blocking foaming problems occurred in the daily production and operation of the plant, which eventually led to the shutdown of the unit. In order to clarify the reason, the key parameters such as solution quality, acid gas load, circulation rate of the solution, flow rate and temperature during operation were analyzed in combination with the specific problems found during overhaul of the plant. The results showed as follows:(1) the local velocity of some pipelines exceeded 30 m/s;(2) the acid gas load exceeded the design value 0.6 mol/mol for a long time;(3) the bottom temperature of reboiler and regeneration tower exceeded 127 ℃;(4) a large amount of thermal stable salts and particles were generated in MDEA solution. On this basis, the interrelation between different process parameters and influence on the stable running of the device were further expounded. In the future production and operation process, it was suggested that the comprehensive management of process parameters of desulfurization unit should be strengthened to ensure the actual operation meeting the design requirements.
引文
[1] 朱雯钊,彭修军,叶辉.MDEA脱硫溶液发泡研究[J].石油与天然气化工,2015,44(2):22-27.
[2] 颜晓琴,刘艳,吴明鸥,等.醇胺脱硫溶液中铁离子的来源及其影响研究[J].石油与天然气化工,2017,46(6):8-13.
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[7] 夏勇,贾浩民,刘国栋,等.天然气脱硫装置中杂质对胺液腐蚀性影响研究[J].石油化工应用,2017,36(1):124-128.
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[11] 陈赓良.醇胺法脱硫脱碳装置的腐蚀与防护[J].石油化工腐蚀与防护,2005,22(1):27-31.
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[16] 李超,王拥军,陆侨治,等.电渗析脱除热稳定盐技术在天然气净化厂的应用.石油与天然气化工,2017,6(5):16-19.
[17] 聂崇斌.醇胺脱硫溶液的降解和复活.石油与天然气化工,2012,41(2):164-168.
[2] 颜晓琴,刘艳,吴明鸥,等.醇胺脱硫溶液中铁离子的来源及其影响研究[J].石油与天然气化工,2017,46(6):8-13.
[3] LIU Y C,WU D N,CHEN M Y,et al.Identification of methyldiethanolamine degradation products and their influence on foaming properties during the desulfurization process for high-sulfurous natural gas[J].Industrial & Engineering Chemistry Research,2015,54(21):5836-5841.
[4] JAMEH A A.Amine solution recovery package and controlling corrosion in regeneration tower[J].International Scholarly and Scientific Research & Innovation,2010,4(9):544-547.
[5] ADDINGTON F,HENDRIX D E.Aggressive Corrosion of 316 Stainless Steel in an Amine Unit:Causes and Cures:NACE international Corrosion 2000 Paper NO.00698,March 26-31,2000[C].Houston:NACE International,2000.
[6] 胡海光,张晓刚,周健.脱硫单元MDEA损耗原因分析及对策[J].硫酸工业,2017(3):41-43.
[7] 夏勇,贾浩民,刘国栋,等.天然气脱硫装置中杂质对胺液腐蚀性影响研究[J].石油化工应用,2017,36(1):124-128.
[8] 罗桄.溶剂再生塔及其重沸器的腐蚀[J].石油化工腐蚀与防护,2002,19(5):17-19.
[9] 常宏岗.气体脱硫装置胺溶液发泡原因及认识[J].石油与天然气化工,1995,24(1):60-63.
[10] 王自顺,孙兰霞,涂连涛.炼油厂胺液脱硫系统运行问题及分析[J].石油与天然气化工,2017,46(3):31-35.
[11] 陈赓良.醇胺法脱硫脱碳装置的腐蚀与防护[J].石油化工腐蚀与防护,2005,22(1):27-31.
[12] CHAKMA A,MEISEN A.Methyl-diethanolamine degradation-Mechanism and kinetics[J].The Canadian Journal of Chemical Engineering,1997,75(5):861-871.
[13] 邓骥.某天然气脱硫装置适应性分析与动态特性研究[D].南充:西南石油大学,2015.
[14] 何燕龙.低含硫高碳硫比天然气脱硫脱碳工艺研究[D].南充:西南石油大学,2016.
[15] 姚春旭.川东北高含硫天然气脱硫脱碳工艺研究[D].青岛:中国石油大学(华东),2011.
[16] 李超,王拥军,陆侨治,等.电渗析脱除热稳定盐技术在天然气净化厂的应用.石油与天然气化工,2017,6(5):16-19.
[17] 聂崇斌.醇胺脱硫溶液的降解和复活.石油与天然气化工,2012,41(2):164-168.