高压输气站计划性放空天然气引射回收理论研究
Theoretical Research on Planned Blow-off Natural Gas Ejection Recovery in High Pressure Gas Transmission Station

随着碳达峰碳中和战略目标的实施，解决高压输气站场计划性检维修天然气放空导致的资源浪费和温室效应势在必行。本文以高压输气站场现有输气工艺和现存天然气回收技术为研究对象，通过研究现存天然气回收技术的优缺点，结合引射器工作原理和现场输气工艺特征，提出了一种计划性放空天然气引射回收工艺流程，并对流程中引射器各项参数进行了计算和优化。研究表明：1) 计划性放空天然气引射回收理论切实可行；2) 设计的引射器可以在给定的工况条件下可以稳定工作，实现天然气的全部回收利用；3) 利用fluent软件进行了模拟分析，进一步优化了引射器结构，引射回收系数值从0.42增长到了0.63，引射器工作性能提高约50%；4) 引射天然气回收工艺流程简单，无动设备引入，投资小且天然气回收成本低。
With the implementation of the strategic goal of carbon peaking and carbon neutrality, it is impera-tive to solve the resource waste and greenhouse effect caused by natural gas emptying in the planned inspection and maintenance of high-pressure gas transmission stations. This paper takes the existing gas transmission process and the existing natural gas recovery technology of the high-pressure gas transmission station as the research object, through studying the advantages and disadvantages of the existing gas recovery technology, combining the working principle of the ejec-tor and the characteristics of the on-site gas transmission process, puts forward a planned natural gas ejector recovery process flow, and calculates and optimizes the parameters of the ejector in the process. 1) The research shows that the theory of planned blow-off gas ejection recovery is feasible. 2) The designed ejector can work stably under the given working conditions and realize the full re-covery of natural gas. 3) Fluent software was used to conduct simulation analysis, and the ejector structure was further optimized. The ejector recovery coefficient increased from 0.42 to 0.63, and the ejector performance was improved by about 50%. 4) The ejector natural gas recovery process is simple, no moving equipment is introduced, the investment is small and the cost of natural gas re-covery is low.