| 摘要: |
| 目的 解决乙烷回收处理装置存在热集成方案不优、制冷系统复杂、工艺参数不优而导致系统能耗偏高的问题。方法 以佳县乙烷回收装置为例，基于系统热集成?夹点技术理论和方法，对乙烷回收装置热集成情况进行分析，基于分析结果提出了一种高热集成度的改进流程—RSVHT。结果 ①改进流程实现了原料气、外输回流气等热物流与脱甲烷塔物流、双温位丙烷制冷剂等冷物流在多股换热器中的高效热集成，在维持95%的乙烷回收率的同时，丙烷用量减少50.8%，系统总压缩功降低了3 641 kW，节能率高达19.9%；②改进流程取消了脱甲烷塔单独供热的重沸器和螺杆式丙烷制冷系统，采用单套丙烷制冷系统提供?8.7 ℃和?38.3 ℃的双温位冷源，简化了制冷流程；③通过优化流程中低温分离器温度和其他流程参数，进一步降低了丙烷制冷剂用量。结论 研究成果为佳县乙烷回收装置的热集成工艺改进提供了有效方案，也为国内乙烷回收装置的设计及优化运行提供了技术参考。 |
| 关键词: 乙烷回收 工艺改进 热集成 夹点技术 参数优化 |
| DOI：10.3969/j.issn.1007-3426.2025.01.008 |
| 分类号: |
| 基金项目:中国石油工程建设有限公司西南分公司科研项目“天然气乙烷回收的理论分析和工艺改进研究”（JCF-2023-200-6） |
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| Improvement of heat integration process for ethane recovery unit |
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Baichuan LIU1, Qingsong LIU2, Hong JIANG2
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1.PetroChina Jidong Oilfield Company, Tangshan, Hebei, China;2.Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan, China
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| Abstract: |
| Objective The ethane recovery and treatment unit in Jiaxian County has issues such as suboptimal heat integration solutions, complex refrigeration system, and suboptimal process parameters, resulting in high energy consumption of the system. This study aims to reduce the energy consumption of the ethane recovery and treatment units. Method Taking the ethane recovery unit in Jiaxian County as an example, an analysis was conducted on its heat integration situation based on the theory and methodology of system heat integration-pinch technology. Based on the findings of this analysis, an improved process with high heat integration degree—RSVHT, was proposed. Result Firstly, the improved process achieved efficient heat integration of hot streams such as raw material gas and external reflux gas with cold streams such as demethanizer streams and dual-temperature propane refrigerants in multiple heat exchangers. While maintaining an ethane recovery rate of 95%, the propane consumption was reduced by 50.8%, and the total compression work of the system was reduced by 3 641 kW, achieving a high energy-saving rate of 19.9%. Secondly, the improved process eliminates the reboiler for separate heating of the demethanizer and the screw-type propane refrigeration system by adopting a single set of propane refrigeration system to provide dual-temperature cold sources of ?8.7 ℃ and ?38.3 ℃, simplifying the refrigeration process. Thirdly, by optimizing the temperature of the low-temperature separator and other process parameters in the process, the amount of propane refrigerant was further reduced. Conclusion The research results provide an effective scheme for improving of the heat integration process of the ethane recovery unit in Jiaxian County, and also provide technical references for the design and optimized operation of domestic ethane recovery units. |
| Key words: ethane recovery process improvement heat integration pinch teehnology parameter optimization |
