化工进展 ›› 2019, Vol. 38 ›› Issue (06): 2581-2589.DOI: 10.16085/j.issn.1000-6613.2018-1994

• 化工过程与装备 • 上一篇    下一篇

常规及创新高压凝液回收流程对比

蒋洪1,张世坚1(),敬加强1,朱聪2   

  1. 1. 西南石油大学石油与天然气工程学院,四川 成都 610500
    2. 西南石油大学机电工程学院,四川 成都 610500
  • 收稿日期:2018-10-03 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: 张世坚
  • 作者简介:蒋洪(1965—),男,副教授,主要从事天然气集输处理及气田汞污染控制研究。

Comparison of conventional and novel high-pressure NGL recovery processes

Hong JIANG1,Shijian ZHANG1(),Jiaqiang JING1,Cong ZHU2   

  1. 1. School of Oil and Natural Gas Engineering of Southwest Petroleum University,Chengdu 610500, Sichuan,China
    2. School of Mechanical and Electrical Engineering of Southwest Petroleum University,Chengdu 610500, Sichuan,China
  • Received:2018-10-03 Online:2019-06-05 Published:2019-06-05
  • Contact: Shijian ZHANG

摘要:

塔里木盆地地区的英买、迪那等大型高压凝析气田目前仅对原料天然气进行了烃水露点控制,重烃回收率低,经济效益没有实现最大化,对此类气田进行凝液回收可显著提升气田的经济效益。现今适用于高压天然气凝液回收的流程主要为HPA(high pressure absorber)流程,本文在HPA流程基础上提出两种改进流程,即改进Ⅰ型流程和改进Ⅱ型流程。并通过SQP(sequential quadratic programming)算法以单位能耗最低为目标函数对3种流程进行操作参数优化, 并通过能耗分析表明:3种流程具有不同原料气贫富和压力适应范围,在贫气条件下,原料气压力在7000~8000kPa范围内,改进Ⅰ型比HPA流程更节能,而当原料气压力高于7500kPa时,改进Ⅱ型流程能耗开始低于前两者,且随原料气压力增加,节能效果更加明显。而对于富气,改进Ⅱ型流程能耗最高,改进Ⅰ型与HPA流程区别不明显。

关键词: 高压凝液回收, 流程改进, 流程优化, 能耗分析

Abstract:

Large-scale high-pressure condensate gas fields such as Yingmai and Dina in the Tarim Basin area currently only simply control the dew and hydrocarbon point for the feed natural gas. The recovery rate of heavy hydrocarbons is very low and the economic benefits are not maximized. Taking NGL (natural gas liquid) recovery for gas fields can significantly increase the economic benefits of these fields. Nowadays, HPA (high pressure absorber) process is widely used to recovery NGL for high-pressure natural gas. In this paper two improved processes based on HPA process were proposed: revised type Ⅰ process and revised type Ⅱ process. SQP(sequential quadratic programming) algorithm was selected to optimize the operating parameters of the three processes with the lowest unit energy consumption as the objective function. The energy consumption analysis showed that the three processes had different adaptation range of feed gas richness and pressure. Under lean conditions the revised type Ⅰ process was more energy efficient than HPA process in the range of feed gas pressures of 7000—8000kPa. When the feed gas pressure was higher than 7500kPa, the energy consumption of revised type Ⅱ process started to be lower than the former two, and with the increase of feed gas pressure, the energy saving of revised type Ⅱ process was more obvious. For rich gas, revised type Ⅱ process had the highest energy consumption and the difference between revised type Ⅰ process and HPA processes was not apparent.

Key words: high-pressure NGL recovery, process improvement, process optimization, energy consumption analysis

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