中亚C线天然气压气站放空系统工艺优化及时序优选

Process optimization and time sequence comparison at compressor station vent system in Central Asia C-line

相对于国内同等规模的压气站,中亚地区天然气管道压气站的场区规模更大,占地面积、管容量以及站内天然气放空量均较大。不点火放空时,为降低可燃气体扩散影响,需从放空区域划分、放空工艺优化、量化操作流程等几方面,对放空系统进行优化。利用先进软件,精确地改进了重要放空参数,优选了放空阀门的形式,引入了分时放空的思路,定量地排列了各个区域的放空时序,有效降低了最大瞬时放空量,缩短了放空时间,改善了扩散条件。对同类项目压气站放空系统工艺设计提供参考。

Compared with the compressor stations of the same scale in China,the gas pipeline compressor stations in Central Asia possess a larger plot area,a greater piping volume and a higher natural gas venting capacity.In order to minimize the influence of combustible gas dispersion,the vent system should be optimized in terms of segregation of blowdown zones,blowdown process optimization and quantitative operation procedure.Utilizing advanced software,we can accurately improve several crucial blowdown parameters.Additionally,the selection of the blowdown valve type can be optimized,and the concept of time-sequenced blowdown can be introduced.By arranging the blowdown time sequencing of each blowdown zone via quantitative assessment,we can effectively reduce the maximum instantaneous venting rate,shorten the blowdown duration,and minimize the gas dispersion extent,which could provide reference for the process design of compressor station vent system in similar projects.