高尚堡天然气处理装置改进与运行优化

Improvement and operation optimization of Gaoshangpu natural gas processing device

关键词:  凝液回收  DHX工艺  液化气铜片腐蚀  设备冻堵  丙烷收率  运行优化 

Key words:  NGL recovery  DHX process  copper corrosion test in LPG  equipment freezing  propane recovery rate  operation optimization

摘要:

高尚堡天然气处理装置采用丙烷+膨胀机制冷的DHX冷凝分离工艺回收C⁺₃轻烃,由于原料气流量降低、气质组成中CO₂和H₂S含量升高、处理装置操作参数变化造成液化气铜片腐蚀不合格、设备冻堵、丙烷收率低等问题。对装置存在问题进行分析后,改进处理工艺,脱除原料气中的CO₂和H₂S至合理范围,解决液化气铜片腐蚀不合格和设备冻堵问题,降低酸性组分对装置冷凝温度的限制。筛选出影响装置丙烷收率和能耗的主要可调参数:膨胀机出口压力、脱乙烷塔操作压力、脱乙烷塔底温度、脱丁烷塔操作压力。通过HYSYS软件模拟结果分析装置主要可调参数对丙烷收率和装置能耗的影响规律,优化运行参数,实现丙烷收率和能耗之间的平衡,达到效益最大化。优化后,装置每年能耗费用增加108.1万元,但产品收入增加439.8万元,每年增加经济效益331.7万元。 

Abstract:

The DHX condensation and separation process by propane and expansion refrigeration are used to recovery C⁺₃ in Gaoshangpu natural gas processing device. Due to the decreasing of feed gas flow rate, the increasing of CO₂ and H₂S content in feed gas, and the variations of processing device operating parameters, a series of problems occurred including copper corrosion test unqualified in LPG, equipment freezing and low propane recovery rate. Based on the analysis of existing problems, processing technology was improved and the CO₂ and H₂S of feed gas were removed to reasonable range to solve the problem of equipment corrosion, freezing and reduce the limit of acid component to the condensing temperature. The main adjustable parameters which can influence propane recovery rate and energy consumption of the device were screened out, including the expander outlet pressure, deethanizer operating pressure, deethanizer bottom temperature, and debutanizer operating pressure. By using HYSYS simulation to analyze the influence of the main adjustable parameters on propane recovery rate and energy consumption and to optimize the operating parameters, the balance between propane recovery and energy consumption was realized and maximum benefit was achieved. After optimization, although the energy cost increase 1.081 million yuan every year, but the product income increase 4.398 million yuan, the annual economic benefit increase 3.317 million yuan.